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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ryusuke/nilfs2

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* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ryusuke/nilfs2: (36 commits)
  nilfs2: eliminate sparse warning - "context imbalance"
  nilfs2: eliminate sparse warnings - "symbol not declared"
  nilfs2: get rid of bdi from nilfs object
  nilfs2: change license of exported header file
  nilfs2: add bdev freeze/thaw support
  nilfs2: accept 64-bit checkpoint numbers in cp mount option
  nilfs2: remove own inode allocator and destructor for metadata files
  nilfs2: get rid of back pointer to writable sb instance
  nilfs2: get rid of mi_nilfs back pointer to nilfs object
  nilfs2: see state of root dentry for mount check of snapshots
  nilfs2: use iget for all metadata files
  nilfs2: get rid of GCDAT inode
  nilfs2: add routines to redirect access to buffers of DAT file
  nilfs2: add routines to roll back state of DAT file
  nilfs2: add routines to save and restore bmap state
  nilfs2: do not allocate nilfs_mdt_info structure to gc-inodes
  nilfs2: allow nilfs_clear_inode to clear metadata file inodes
  nilfs2: get rid of snapshot mount flag
  nilfs2: simplify life cycle management of nilfs object
  nilfs2: do not allocate multiple super block instances for a device
  ...
This commit is contained in:
Linus Torvalds 2010-10-23 01:26:47 -07:00
commit ab34c02afe
33 changed files with 1350 additions and 1268 deletions
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2
fs/nilfs2/Makefile
View file

@ -2,4 +2,4 @@ obj-$(CONFIG_NILFS2_FS) += nilfs2.o
nilfs2-y := inode.o file.o dir.o super.o namei.o page.o mdt.o \
btnode.o bmap.o btree.o direct.o dat.o recovery.o \
the_nilfs.o segbuf.o segment.o cpfile.o sufile.o \
ifile.o alloc.o gcinode.o ioctl.o gcdat.o
ifile.o alloc.o gcinode.o ioctl.o

22
fs/nilfs2/bmap.c
View file

@ -533,18 +533,20 @@ void nilfs_bmap_init_gc(struct nilfs_bmap *bmap)
nilfs_btree_init_gc(bmap);
}
void nilfs_bmap_init_gcdat(struct nilfs_bmap *gcbmap, struct nilfs_bmap *bmap)
void nilfs_bmap_save(const struct nilfs_bmap *bmap,
struct nilfs_bmap_store *store)
{
memcpy(gcbmap, bmap, sizeof(*bmap));
init_rwsem(&gcbmap->b_sem);
lockdep_set_class(&bmap->b_sem, &nilfs_bmap_dat_lock_key);
gcbmap->b_inode = &NILFS_BMAP_I(gcbmap)->vfs_inode;
memcpy(store->data, bmap->b_u.u_data, sizeof(store->data));
store->last_allocated_key = bmap->b_last_allocated_key;
store->last_allocated_ptr = bmap->b_last_allocated_ptr;
store->state = bmap->b_state;
}
void nilfs_bmap_commit_gcdat(struct nilfs_bmap *gcbmap, struct nilfs_bmap *bmap)
void nilfs_bmap_restore(struct nilfs_bmap *bmap,
const struct nilfs_bmap_store *store)
{
memcpy(bmap, gcbmap, sizeof(*bmap));
init_rwsem(&bmap->b_sem);
lockdep_set_class(&bmap->b_sem, &nilfs_bmap_dat_lock_key);
bmap->b_inode = &NILFS_BMAP_I(bmap)->vfs_inode;
memcpy(bmap->b_u.u_data, store->data, sizeof(store->data));
bmap->b_last_allocated_key = store->last_allocated_key;
bmap->b_last_allocated_ptr = store->last_allocated_ptr;
bmap->b_state = store->state;
}

10
fs/nilfs2/bmap.h
View file

@ -135,6 +135,12 @@ struct nilfs_bmap {
/* state */
#define NILFS_BMAP_DIRTY 0x00000001
struct nilfs_bmap_store {
__le64 data[NILFS_BMAP_SIZE / sizeof(__le64)];
__u64 last_allocated_key;
__u64 last_allocated_ptr;
int state;
};
int nilfs_bmap_test_and_clear_dirty(struct nilfs_bmap *);
int nilfs_bmap_read(struct nilfs_bmap *, struct nilfs_inode *);
@ -153,9 +159,9 @@ int nilfs_bmap_lookup_at_level(struct nilfs_bmap *, __u64, int, __u64 *);
int nilfs_bmap_mark(struct nilfs_bmap *, __u64, int);
void nilfs_bmap_init_gc(struct nilfs_bmap *);
void nilfs_bmap_init_gcdat(struct nilfs_bmap *, struct nilfs_bmap *);
void nilfs_bmap_commit_gcdat(struct nilfs_bmap *, struct nilfs_bmap *);
void nilfs_bmap_save(const struct nilfs_bmap *, struct nilfs_bmap_store *);
void nilfs_bmap_restore(struct nilfs_bmap *, const struct nilfs_bmap_store *);
static inline int nilfs_bmap_lookup(struct nilfs_bmap *bmap, __u64 key,
__u64 *ptr)

17
fs/nilfs2/btnode.c
View file

@ -37,15 +37,7 @@
void nilfs_btnode_cache_init_once(struct address_space *btnc)
{
memset(btnc, 0, sizeof(*btnc));
INIT_RADIX_TREE(&btnc->page_tree, GFP_ATOMIC);
spin_lock_init(&btnc->tree_lock);
INIT_LIST_HEAD(&btnc->private_list);
spin_lock_init(&btnc->private_lock);
spin_lock_init(&btnc->i_mmap_lock);
INIT_RAW_PRIO_TREE_ROOT(&btnc->i_mmap);
INIT_LIST_HEAD(&btnc->i_mmap_nonlinear);
nilfs_mapping_init_once(btnc);
}
static const struct address_space_operations def_btnode_aops = {
@ -55,12 +47,7 @@ static const struct address_space_operations def_btnode_aops = {
void nilfs_btnode_cache_init(struct address_space *btnc,
struct backing_dev_info *bdi)
{
btnc->host = NULL; /* can safely set to host inode ? */
btnc->flags = 0;
mapping_set_gfp_mask(btnc, GFP_NOFS);
btnc->assoc_mapping = NULL;
btnc->backing_dev_info = bdi;
btnc->a_ops = &def_btnode_aops;
nilfs_mapping_init(btnc, bdi, &def_btnode_aops);
}
void nilfs_btnode_cache_clear(struct address_space *btnc)

72
fs/nilfs2/cpfile.c
View file

@ -863,26 +863,19 @@ int nilfs_cpfile_is_snapshot(struct inode *cpfile, __u64 cno)
*/
int nilfs_cpfile_change_cpmode(struct inode *cpfile, __u64 cno, int mode)
{
struct the_nilfs *nilfs;
int ret;
nilfs = NILFS_MDT(cpfile)->mi_nilfs;
switch (mode) {
case NILFS_CHECKPOINT:
/*
* Check for protecting existing snapshot mounts:
* ns_mount_mutex is used to make this operation atomic and
* exclusive with a new mount job. Though it doesn't cover
* umount, it's enough for the purpose.
*/
if (nilfs_checkpoint_is_mounted(nilfs, cno, 1)) {
/* Current implementation does not have to protect
plain read-only mounts since they are exclusive
with a read/write mount and are protected from the
cleaner. */
if (nilfs_checkpoint_is_mounted(cpfile->i_sb, cno))
/*
* Current implementation does not have to protect
* plain read-only mounts since they are exclusive
* with a read/write mount and are protected from the
* cleaner.
*/
ret = -EBUSY;
} else
else
ret = nilfs_cpfile_clear_snapshot(cpfile, cno);
return ret;
case NILFS_SNAPSHOT:
@ -933,27 +926,40 @@ int nilfs_cpfile_get_stat(struct inode *cpfile, struct nilfs_cpstat *cpstat)
}
/**
* nilfs_cpfile_read - read cpfile inode
* @cpfile: cpfile inode
* @raw_inode: on-disk cpfile inode
*/
int nilfs_cpfile_read(struct inode *cpfile, struct nilfs_inode *raw_inode)
{
return nilfs_read_inode_common(cpfile, raw_inode);
}
/**
* nilfs_cpfile_new - create cpfile
* @nilfs: nilfs object
* nilfs_cpfile_read - read or get cpfile inode
* @sb: super block instance
* @cpsize: size of a checkpoint entry
* @raw_inode: on-disk cpfile inode
* @inodep: buffer to store the inode
*/
struct inode *nilfs_cpfile_new(struct the_nilfs *nilfs, size_t cpsize)
int nilfs_cpfile_read(struct super_block *sb, size_t cpsize,
struct nilfs_inode *raw_inode, struct inode **inodep)
{
struct inode *cpfile;
int err;
cpfile = nilfs_mdt_new(nilfs, NULL, NILFS_CPFILE_INO, 0);
if (cpfile)
nilfs_mdt_set_entry_size(cpfile, cpsize,
sizeof(struct nilfs_cpfile_header));
return cpfile;
cpfile = nilfs_iget_locked(sb, NULL, NILFS_CPFILE_INO);
if (unlikely(!cpfile))
return -ENOMEM;
if (!(cpfile->i_state & I_NEW))
goto out;
err = nilfs_mdt_init(cpfile, NILFS_MDT_GFP, 0);
if (err)
goto failed;
nilfs_mdt_set_entry_size(cpfile, cpsize,
sizeof(struct nilfs_cpfile_header));
err = nilfs_read_inode_common(cpfile, raw_inode);
if (err)
goto failed;
unlock_new_inode(cpfile);
out:
*inodep = cpfile;
return 0;
failed:
iget_failed(cpfile);
return err;
}

4
fs/nilfs2/cpfile.h
View file

@ -40,7 +40,7 @@ int nilfs_cpfile_get_stat(struct inode *, struct nilfs_cpstat *);
ssize_t nilfs_cpfile_get_cpinfo(struct inode *, __u64 *, int, void *, unsigned,
size_t);
int nilfs_cpfile_read(struct inode *cpfile, struct nilfs_inode *raw_inode);
struct inode *nilfs_cpfile_new(struct the_nilfs *nilfs, size_t cpsize);
int nilfs_cpfile_read(struct super_block *sb, size_t cpsize,
struct nilfs_inode *raw_inode, struct inode **inodep);
#endif /* _NILFS_CPFILE_H */

92
fs/nilfs2/dat.c
View file

@ -36,6 +36,7 @@
struct nilfs_dat_info {
struct nilfs_mdt_info mi;
struct nilfs_palloc_cache palloc_cache;
struct nilfs_shadow_map shadow;
};
static inline struct nilfs_dat_info *NILFS_DAT_I(struct inode *dat)
@ -102,7 +103,8 @@ void nilfs_dat_abort_alloc(struct inode *dat, struct nilfs_palloc_req *req)
nilfs_palloc_abort_alloc_entry(dat, req);
}
void nilfs_dat_commit_free(struct inode *dat, struct nilfs_palloc_req *req)
static void nilfs_dat_commit_free(struct inode *dat,
struct nilfs_palloc_req *req)
{
struct nilfs_dat_entry *entry;
void *kaddr;
@ -327,6 +329,23 @@ int nilfs_dat_move(struct inode *dat, __u64 vblocknr, sector_t blocknr)
ret = nilfs_palloc_get_entry_block(dat, vblocknr, 0, &entry_bh);
if (ret < 0)
return ret;
/*
* The given disk block number (blocknr) is not yet written to
* the device at this point.
*
* To prevent nilfs_dat_translate() from returning the
* uncommited block number, this makes a copy of the entry
* buffer and redirects nilfs_dat_translate() to the copy.
*/
if (!buffer_nilfs_redirected(entry_bh)) {
ret = nilfs_mdt_freeze_buffer(dat, entry_bh);
if (ret) {
brelse(entry_bh);
return ret;
}
}
kaddr = kmap_atomic(entry_bh->b_page, KM_USER0);
entry = nilfs_palloc_block_get_entry(dat, vblocknr, entry_bh, kaddr);
if (unlikely(entry->de_blocknr == cpu_to_le64(0))) {
@ -371,7 +390,7 @@ int nilfs_dat_move(struct inode *dat, __u64 vblocknr, sector_t blocknr)
*/
int nilfs_dat_translate(struct inode *dat, __u64 vblocknr, sector_t *blocknrp)
{
struct buffer_head *entry_bh;
struct buffer_head *entry_bh, *bh;
struct nilfs_dat_entry *entry;
sector_t blocknr;
void *kaddr;
@ -381,6 +400,15 @@ int nilfs_dat_translate(struct inode *dat, __u64 vblocknr, sector_t *blocknrp)
if (ret < 0)
return ret;
if (!nilfs_doing_gc() && buffer_nilfs_redirected(entry_bh)) {
bh = nilfs_mdt_get_frozen_buffer(dat, entry_bh);
if (bh) {
WARN_ON(!buffer_uptodate(bh));
brelse(entry_bh);
entry_bh = bh;
}
}
kaddr = kmap_atomic(entry_bh->b_page, KM_USER0);
entry = nilfs_palloc_block_get_entry(dat, vblocknr, entry_bh, kaddr);
blocknr = le64_to_cpu(entry->de_blocknr);
@ -436,38 +464,48 @@ ssize_t nilfs_dat_get_vinfo(struct inode *dat, void *buf, unsigned visz,
}
/**
* nilfs_dat_read - read dat inode
* @dat: dat inode
* @raw_inode: on-disk dat inode
*/
int nilfs_dat_read(struct inode *dat, struct nilfs_inode *raw_inode)
{
return nilfs_read_inode_common(dat, raw_inode);
}
/**
* nilfs_dat_new - create dat file
* @nilfs: nilfs object
* nilfs_dat_read - read or get dat inode
* @sb: super block instance
* @entry_size: size of a dat entry
* @raw_inode: on-disk dat inode
* @inodep: buffer to store the inode
*/
struct inode *nilfs_dat_new(struct the_nilfs *nilfs, size_t entry_size)
int nilfs_dat_read(struct super_block *sb, size_t entry_size,
struct nilfs_inode *raw_inode, struct inode **inodep)
{
static struct lock_class_key dat_lock_key;
struct inode *dat;
struct nilfs_dat_info *di;
int err;
dat = nilfs_mdt_new(nilfs, NULL, NILFS_DAT_INO, sizeof(*di));
if (dat) {
err = nilfs_palloc_init_blockgroup(dat, entry_size);
if (unlikely(err)) {
nilfs_mdt_destroy(dat);
return NULL;
}
dat = nilfs_iget_locked(sb, NULL, NILFS_DAT_INO);
if (unlikely(!dat))
return -ENOMEM;
if (!(dat->i_state & I_NEW))
goto out;
di = NILFS_DAT_I(dat);
lockdep_set_class(&di->mi.mi_sem, &dat_lock_key);
nilfs_palloc_setup_cache(dat, &di->palloc_cache);
}
return dat;
err = nilfs_mdt_init(dat, NILFS_MDT_GFP, sizeof(*di));
if (err)
goto failed;
err = nilfs_palloc_init_blockgroup(dat, entry_size);
if (err)
goto failed;
di = NILFS_DAT_I(dat);
lockdep_set_class(&di->mi.mi_sem, &dat_lock_key);
nilfs_palloc_setup_cache(dat, &di->palloc_cache);
nilfs_mdt_setup_shadow_map(dat, &di->shadow);
err = nilfs_read_inode_common(dat, raw_inode);
if (err)
goto failed;
unlock_new_inode(dat);
out:
*inodep = dat;
return 0;
failed:
iget_failed(dat);
return err;
}

4
fs/nilfs2/dat.h
View file

@ -53,7 +53,7 @@ int nilfs_dat_freev(struct inode *, __u64 *, size_t);
int nilfs_dat_move(struct inode *, __u64, sector_t);
ssize_t nilfs_dat_get_vinfo(struct inode *, void *, unsigned, size_t);
int nilfs_dat_read(struct inode *dat, struct nilfs_inode *raw_inode);
struct inode *nilfs_dat_new(struct the_nilfs *nilfs, size_t entry_size);
int nilfs_dat_read(struct super_block *sb, size_t entry_size,
struct nilfs_inode *raw_inode, struct inode **inodep);
#endif /* _NILFS_DAT_H */

17
fs/nilfs2/export.h Normal file
View file

@ -0,0 +1,17 @@
#ifndef NILFS_EXPORT_H
#define NILFS_EXPORT_H
#include <linux/exportfs.h>
extern const struct export_operations nilfs_export_ops;
struct nilfs_fid {
u64 cno;
u64 ino;
u32 gen;
u32 parent_gen;
u64 parent_ino;
} __attribute__ ((packed));
#endif

87
fs/nilfs2/gcdat.c
View file

@ -1,87 +0,0 @@
/*
* gcdat.c - NILFS shadow DAT inode for GC
*
* Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Written by Seiji Kihara <kihara@osrg.net>, Amagai Yoshiji <amagai@osrg.net>,
* and Ryusuke Konishi <ryusuke@osrg.net>.
*
*/
#include <linux/buffer_head.h>
#include "nilfs.h"
#include "page.h"
#include "mdt.h"
int nilfs_init_gcdat_inode(struct the_nilfs *nilfs)
{
struct inode *dat = nilfs->ns_dat, *gcdat = nilfs->ns_gc_dat;
struct nilfs_inode_info *dii = NILFS_I(dat), *gii = NILFS_I(gcdat);
int err;
gcdat->i_state = 0;
gcdat->i_blocks = dat->i_blocks;
gii->i_flags = dii->i_flags;
gii->i_state = dii->i_state | (1 << NILFS_I_GCDAT);
gii->i_cno = 0;
nilfs_bmap_init_gcdat(gii->i_bmap, dii->i_bmap);
err = nilfs_copy_dirty_pages(gcdat->i_mapping, dat->i_mapping);
if (unlikely(err))
return err;
return nilfs_copy_dirty_pages(&gii->i_btnode_cache,
&dii->i_btnode_cache);
}
void nilfs_commit_gcdat_inode(struct the_nilfs *nilfs)
{
struct inode *dat = nilfs->ns_dat, *gcdat = nilfs->ns_gc_dat;
struct nilfs_inode_info *dii = NILFS_I(dat), *gii = NILFS_I(gcdat);
struct address_space *mapping = dat->i_mapping;
struct address_space *gmapping = gcdat->i_mapping;
down_write(&NILFS_MDT(dat)->mi_sem);
dat->i_blocks = gcdat->i_blocks;
dii->i_flags = gii->i_flags;
dii->i_state = gii->i_state & ~(1 << NILFS_I_GCDAT);
nilfs_bmap_commit_gcdat(gii->i_bmap, dii->i_bmap);
nilfs_palloc_clear_cache(dat);
nilfs_palloc_clear_cache(gcdat);
nilfs_clear_dirty_pages(mapping);
nilfs_copy_back_pages(mapping, gmapping);
/* note: mdt dirty flags should be cleared by segctor. */
nilfs_clear_dirty_pages(&dii->i_btnode_cache);
nilfs_copy_back_pages(&dii->i_btnode_cache, &gii->i_btnode_cache);
up_write(&NILFS_MDT(dat)->mi_sem);
}
void nilfs_clear_gcdat_inode(struct the_nilfs *nilfs)
{
struct inode *gcdat = nilfs->ns_gc_dat;
struct nilfs_inode_info *gii = NILFS_I(gcdat);
gcdat->i_state = I_FREEING | I_CLEAR;
gii->i_flags = 0;
nilfs_palloc_clear_cache(gcdat);
truncate_inode_pages(gcdat->i_mapping, 0);
truncate_inode_pages(&gii->i_btnode_cache, 0);
}

136
fs/nilfs2/gcinode.c
View file

@ -28,13 +28,6 @@
* gcinodes), and this file provides lookup function of the dummy
* inodes and their buffer read function.
*
* Since NILFS2 keeps up multiple checkpoints/snapshots across GC, it
* has to treat blocks that belong to a same file but have different
* checkpoint numbers. To avoid interference among generations, dummy
* inodes are managed separately from actual inodes, and their lookup
* function (nilfs_gc_iget) is designed to be specified with a
* checkpoint number argument as well as an inode number.
*
* Buffers and pages held by the dummy inodes will be released each
* time after they are copied to a new log. Dirty blocks made on the
* current generation and the blocks to be moved by GC never overlap
@ -175,125 +168,46 @@ int nilfs_gccache_wait_and_mark_dirty(struct buffer_head *bh)
}
nilfs_btnode_mark_dirty(bh);
} else {
nilfs_mdt_mark_buffer_dirty(bh);
nilfs_mark_buffer_dirty(bh);
}
return 0;
}
/*
* nilfs_init_gccache() - allocate and initialize gc_inode hash table
* @nilfs - the_nilfs
*
* Return Value: On success, 0.
* On error, a negative error code is returned.
*/
int nilfs_init_gccache(struct the_nilfs *nilfs)
int nilfs_init_gcinode(struct inode *inode)
{
int loop;
struct nilfs_inode_info *ii = NILFS_I(inode);
struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
BUG_ON(nilfs->ns_gc_inodes_h);
INIT_LIST_HEAD(&nilfs->ns_gc_inodes);
nilfs->ns_gc_inodes_h =
kmalloc(sizeof(struct hlist_head) * NILFS_GCINODE_HASH_SIZE,
GFP_NOFS);
if (nilfs->ns_gc_inodes_h == NULL)
return -ENOMEM;
for (loop = 0; loop < NILFS_GCINODE_HASH_SIZE; loop++)
INIT_HLIST_HEAD(&nilfs->ns_gc_inodes_h[loop]);
return 0;
}
/*
* nilfs_destroy_gccache() - free gc_inode hash table
* @nilfs - the nilfs
*/
void nilfs_destroy_gccache(struct the_nilfs *nilfs)
{
if (nilfs->ns_gc_inodes_h) {
nilfs_remove_all_gcinode(nilfs);
kfree(nilfs->ns_gc_inodes_h);
nilfs->ns_gc_inodes_h = NULL;
}
}
static struct inode *alloc_gcinode(struct the_nilfs *nilfs, ino_t ino,
__u64 cno)
{
struct inode *inode;
struct nilfs_inode_info *ii;
inode = nilfs_mdt_new_common(nilfs, NULL, ino, GFP_NOFS, 0);
if (!inode)
return NULL;
inode->i_op = NULL;
inode->i_fop = NULL;
inode->i_mode = S_IFREG;
mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
inode->i_mapping->a_ops = &def_gcinode_aops;
inode->i_mapping->backing_dev_info = inode->i_sb->s_bdi;
ii = NILFS_I(inode);
ii->i_cno = cno;
ii->i_flags = 0;
ii->i_state = 1 << NILFS_I_GCINODE;
ii->i_bh = NULL;
nilfs_bmap_init_gc(ii->i_bmap);
return inode;
/*
* Add the inode to GC inode list. Garbage Collection
* is serialized and no two processes manipulate the
* list simultaneously.
*/
igrab(inode);
list_add(&NILFS_I(inode)->i_dirty, &nilfs->ns_gc_inodes);
return 0;
}
static unsigned long ihash(ino_t ino, __u64 cno)
{
return hash_long((unsigned long)((ino << 2) + cno),
NILFS_GCINODE_HASH_BITS);
}
/*
* nilfs_gc_iget() - find or create gc inode with specified (ino,cno)
/**
* nilfs_remove_all_gcinodes() - remove all unprocessed gc inodes
*/
struct inode *nilfs_gc_iget(struct the_nilfs *nilfs, ino_t ino, __u64 cno)
void nilfs_remove_all_gcinodes(struct the_nilfs *nilfs)
{
struct hlist_head *head = nilfs->ns_gc_inodes_h + ihash(ino, cno);
struct hlist_node *node;
struct inode *inode;
struct list_head *head = &nilfs->ns_gc_inodes;
struct nilfs_inode_info *ii;
hlist_for_each_entry(inode, node, head, i_hash) {
if (inode->i_ino == ino && NILFS_I(inode)->i_cno == cno)
return inode;
}
inode = alloc_gcinode(nilfs, ino, cno);
if (likely(inode)) {
hlist_add_head(&inode->i_hash, head);
list_add(&NILFS_I(inode)->i_dirty, &nilfs->ns_gc_inodes);
}
return inode;
}
/*
* nilfs_clear_gcinode() - clear and free a gc inode
*/
void nilfs_clear_gcinode(struct inode *inode)
{
nilfs_mdt_destroy(inode);
}
/*
* nilfs_remove_all_gcinode() - remove all inodes from the_nilfs
*/
void nilfs_remove_all_gcinode(struct the_nilfs *nilfs)
{
struct hlist_head *head = nilfs->ns_gc_inodes_h;
struct hlist_node *node, *n;
struct inode *inode;
int loop;
for (loop = 0; loop < NILFS_GCINODE_HASH_SIZE; loop++, head++) {
hlist_for_each_entry_safe(inode, node, n, head, i_hash) {
hlist_del_init(&inode->i_hash);
list_del_init(&NILFS_I(inode)->i_dirty);
nilfs_clear_gcinode(inode); /* might sleep */
}
while (!list_empty(head)) {
ii = list_first_entry(head, struct nilfs_inode_info, i_dirty);
list_del_init(&ii->i_dirty);
iput(&ii->vfs_inode);
}
}

51
fs/nilfs2/ifile.c
View file

@ -161,25 +161,46 @@ int nilfs_ifile_get_inode_block(struct inode *ifile, ino_t ino,
}
/**
* nilfs_ifile_new - create inode file
* @sbi: nilfs_sb_info struct
* nilfs_ifile_read - read or get ifile inode
* @sb: super block instance
* @root: root object
* @inode_size: size of an inode
* @raw_inode: on-disk ifile inode
* @inodep: buffer to store the inode
*/
struct inode *nilfs_ifile_new(struct nilfs_sb_info *sbi, size_t inode_size)
int nilfs_ifile_read(struct super_block *sb, struct nilfs_root *root,
size_t inode_size, struct nilfs_inode *raw_inode,
struct inode **inodep)
{
struct inode *ifile;
int err;
ifile = nilfs_mdt_new(sbi->s_nilfs, sbi->s_super, NILFS_IFILE_INO,
sizeof(struct nilfs_ifile_info));
if (ifile) {
err = nilfs_palloc_init_blockgroup(ifile, inode_size);
if (unlikely(err)) {
nilfs_mdt_destroy(ifile);
return NULL;
}
nilfs_palloc_setup_cache(ifile,
&NILFS_IFILE_I(ifile)->palloc_cache);
}
return ifile;
ifile = nilfs_iget_locked(sb, root, NILFS_IFILE_INO);
if (unlikely(!ifile))
return -ENOMEM;
if (!(ifile->i_state & I_NEW))
goto out;
err = nilfs_mdt_init(ifile, NILFS_MDT_GFP,
sizeof(struct nilfs_ifile_info));
if (err)
goto failed;
err = nilfs_palloc_init_blockgroup(ifile, inode_size);
if (err)
goto failed;
nilfs_palloc_setup_cache(ifile, &NILFS_IFILE_I(ifile)->palloc_cache);
err = nilfs_read_inode_common(ifile, raw_inode);
if (err)
goto failed;
unlock_new_inode(ifile);
out:
*inodep = ifile;
return 0;
failed:
iget_failed(ifile);
return err;
}

4
fs/nilfs2/ifile.h
View file

@ -49,6 +49,8 @@ int nilfs_ifile_create_inode(struct inode *, ino_t *, struct buffer_head **);
int nilfs_ifile_delete_inode(struct inode *, ino_t);
int nilfs_ifile_get_inode_block(struct inode *, ino_t, struct buffer_head **);
struct inode *nilfs_ifile_new(struct nilfs_sb_info *sbi, size_t inode_size);
int nilfs_ifile_read(struct super_block *sb, struct nilfs_root *root,
size_t inode_size, struct nilfs_inode *raw_inode,
struct inode **inodep);
#endif /* _NILFS_IFILE_H */

167
fs/nilfs2/inode.c
View file

@ -34,6 +34,12 @@
#include "cpfile.h"
#include "ifile.h"
struct nilfs_iget_args {
u64 ino;
__u64 cno;
struct nilfs_root *root;
int for_gc;
};
/**
* nilfs_get_block() - get a file block on the filesystem (callback function)
@ -279,6 +285,7 @@ struct inode *nilfs_new_inode(struct inode *dir, int mode)
struct nilfs_sb_info *sbi = NILFS_SB(sb);
struct inode *inode;
struct nilfs_inode_info *ii;
struct nilfs_root *root;
int err = -ENOMEM;
ino_t ino;
@ -289,15 +296,17 @@ struct inode *nilfs_new_inode(struct inode *dir, int mode)
mapping_set_gfp_mask(inode->i_mapping,
mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS);
root = NILFS_I(dir)->i_root;
ii = NILFS_I(inode);
ii->i_state = 1 << NILFS_I_NEW;
ii->i_root = root;
err = nilfs_ifile_create_inode(sbi->s_ifile, &ino, &ii->i_bh);
err = nilfs_ifile_create_inode(root->ifile, &ino, &ii->i_bh);
if (unlikely(err))
goto failed_ifile_create_inode;
/* reference count of i_bh inherits from nilfs_mdt_read_block() */
atomic_inc(&sbi->s_inodes_count);
atomic_inc(&root->inodes_count);
inode_init_owner(inode, dir, mode);
inode->i_ino = ino;
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
@ -320,7 +329,6 @@ struct inode *nilfs_new_inode(struct inode *dir, int mode)
/* ii->i_file_acl = 0; */
/* ii->i_dir_acl = 0; */
ii->i_dir_start_lookup = 0;
ii->i_cno = 0;
nilfs_set_inode_flags(inode);
spin_lock(&sbi->s_next_gen_lock);
inode->i_generation = sbi->s_next_generation++;
@ -350,16 +358,6 @@ struct inode *nilfs_new_inode(struct inode *dir, int mode)
return ERR_PTR(err);
}
void nilfs_free_inode(struct inode *inode)
{
struct super_block *sb = inode->i_sb;
struct nilfs_sb_info *sbi = NILFS_SB(sb);
/* XXX: check error code? Is there any thing I can do? */
(void) nilfs_ifile_delete_inode(sbi->s_ifile, inode->i_ino);
atomic_dec(&sbi->s_inodes_count);
}
void nilfs_set_inode_flags(struct inode *inode)
{
unsigned int flags = NILFS_I(inode)->i_flags;
@ -410,7 +408,6 @@ int nilfs_read_inode_common(struct inode *inode,
0 : le32_to_cpu(raw_inode->i_dir_acl);
#endif
ii->i_dir_start_lookup = 0;
ii->i_cno = 0;
inode->i_generation = le32_to_cpu(raw_inode->i_generation);
if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
@ -424,7 +421,8 @@ int nilfs_read_inode_common(struct inode *inode,
return 0;
}
static int __nilfs_read_inode(struct super_block *sb, unsigned long ino,
static int __nilfs_read_inode(struct super_block *sb,
struct nilfs_root *root, unsigned long ino,
struct inode *inode)
{
struct nilfs_sb_info *sbi = NILFS_SB(sb);
@ -434,11 +432,11 @@ static int __nilfs_read_inode(struct super_block *sb, unsigned long ino,
int err;
down_read(&NILFS_MDT(dat)->mi_sem); /* XXX */
err = nilfs_ifile_get_inode_block(sbi->s_ifile, ino, &bh);
err = nilfs_ifile_get_inode_block(root->ifile, ino, &bh);
if (unlikely(err))
goto bad_inode;
raw_inode = nilfs_ifile_map_inode(sbi->s_ifile, ino, bh);
raw_inode = nilfs_ifile_map_inode(root->ifile, ino, bh);
err = nilfs_read_inode_common(inode, raw_inode);
if (err)
@ -461,14 +459,14 @@ static int __nilfs_read_inode(struct super_block *sb, unsigned long ino,
inode, inode->i_mode,
huge_decode_dev(le64_to_cpu(raw_inode->i_device_code)));
}
nilfs_ifile_unmap_inode(sbi->s_ifile, ino, bh);
nilfs_ifile_unmap_inode(root->ifile, ino, bh);
brelse(bh);
up_read(&NILFS_MDT(dat)->mi_sem); /* XXX */
nilfs_set_inode_flags(inode);
return 0;
failed_unmap:
nilfs_ifile_unmap_inode(sbi->s_ifile, ino, bh);
nilfs_ifile_unmap_inode(root->ifile, ino, bh);
brelse(bh);
bad_inode:
@ -476,18 +474,95 @@ static int __nilfs_read_inode(struct super_block *sb, unsigned long ino,
return err;
}
struct inode *nilfs_iget(struct super_block *sb, unsigned long ino)
static int nilfs_iget_test(struct inode *inode, void *opaque)
{
struct nilfs_iget_args *args = opaque;
struct nilfs_inode_info *ii;
if (args->ino != inode->i_ino || args->root != NILFS_I(inode)->i_root)
return 0;
ii = NILFS_I(inode);
if (!test_bit(NILFS_I_GCINODE, &ii->i_state))
return !args->for_gc;
return args->for_gc && args->cno == ii->i_cno;
}
static int nilfs_iget_set(struct inode *inode, void *opaque)
{
struct nilfs_iget_args *args = opaque;
inode->i_ino = args->ino;
if (args->for_gc) {
NILFS_I(inode)->i_state = 1 << NILFS_I_GCINODE;
NILFS_I(inode)->i_cno = args->cno;
NILFS_I(inode)->i_root = NULL;
} else {
if (args->root && args->ino == NILFS_ROOT_INO)
nilfs_get_root(args->root);
NILFS_I(inode)->i_root = args->root;
}
return 0;
}
struct inode *nilfs_ilookup(struct super_block *sb, struct nilfs_root *root,
unsigned long ino)
{
struct nilfs_iget_args args = {
.ino = ino, .root = root, .cno = 0, .for_gc = 0
};
return ilookup5(sb, ino, nilfs_iget_test, &args);
}
struct inode *nilfs_iget_locked(struct super_block *sb, struct nilfs_root *root,
unsigned long ino)
{
struct nilfs_iget_args args = {
.ino = ino, .root = root, .cno = 0, .for_gc = 0
};
return iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args);
}
struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root,
unsigned long ino)
{
struct inode *inode;
int err;
inode = iget_locked(sb, ino);
inode = nilfs_iget_locked(sb, root, ino);
if (unlikely(!inode))
return ERR_PTR(-ENOMEM);
if (!(inode->i_state & I_NEW))
return inode;
err = __nilfs_read_inode(sb, ino, inode);
err = __nilfs_read_inode(sb, root, ino, inode);
if (unlikely(err)) {
iget_failed(inode);
return ERR_PTR(err);
}
unlock_new_inode(inode);
return inode;
}
struct inode *nilfs_iget_for_gc(struct super_block *sb, unsigned long ino,
__u64 cno)
{
struct nilfs_iget_args args = {
.ino = ino, .root = NULL, .cno = cno, .for_gc = 1
};
struct inode *inode;
int err;
inode = iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args);
if (unlikely(!inode))
return ERR_PTR(-ENOMEM);
if (!(inode->i_state & I_NEW))
return inode;
err = nilfs_init_gcinode(inode);
if (unlikely(err)) {
iget_failed(inode);
return ERR_PTR(err);
@ -528,21 +603,20 @@ void nilfs_update_inode(struct inode *inode, struct buffer_head *ibh)
{
ino_t ino = inode->i_ino;
struct nilfs_inode_info *ii = NILFS_I(inode);
struct super_block *sb = inode->i_sb;
struct nilfs_sb_info *sbi = NILFS_SB(sb);
struct inode *ifile = ii->i_root->ifile;
struct nilfs_inode *raw_inode;
raw_inode = nilfs_ifile_map_inode(sbi->s_ifile, ino, ibh);
raw_inode = nilfs_ifile_map_inode(ifile, ino, ibh);
if (test_and_clear_bit(NILFS_I_NEW, &ii->i_state))
memset(raw_inode, 0, NILFS_MDT(sbi->s_ifile)->mi_entry_size);
memset(raw_inode, 0, NILFS_MDT(ifile)->mi_entry_size);
set_bit(NILFS_I_INODE_DIRTY, &ii->i_state);
nilfs_write_inode_common(inode, raw_inode, 0);
/* XXX: call with has_bmap = 0 is a workaround to avoid
deadlock of bmap. This delays update of i_bmap to just
before writing */
nilfs_ifile_unmap_inode(sbi->s_ifile, ino, ibh);
nilfs_ifile_unmap_inode(ifile, ino, ibh);
}
#define NILFS_MAX_TRUNCATE_BLOCKS 16384 /* 64MB for 4KB block */
@ -617,6 +691,7 @@ void nilfs_truncate(struct inode *inode)
static void nilfs_clear_inode(struct inode *inode)
{
struct nilfs_inode_info *ii = NILFS_I(inode);
struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
/*
* Free resources allocated in nilfs_read_inode(), here.
@ -625,10 +700,16 @@ static void nilfs_clear_inode(struct inode *inode)
brelse(ii->i_bh);
ii->i_bh = NULL;
if (mdi && mdi->mi_palloc_cache)
nilfs_palloc_destroy_cache(inode);
if (test_bit(NILFS_I_BMAP, &ii->i_state))
nilfs_bmap_clear(ii->i_bmap);
nilfs_btnode_cache_clear(&ii->i_btnode_cache);
if (ii->i_root && inode->i_ino == NILFS_ROOT_INO)
nilfs_put_root(ii->i_root);
}
void nilfs_evict_inode(struct inode *inode)
@ -637,7 +718,7 @@ void nilfs_evict_inode(struct inode *inode)
struct super_block *sb = inode->i_sb;
struct nilfs_inode_info *ii = NILFS_I(inode);
if (inode->i_nlink || unlikely(is_bad_inode(inode))) {
if (inode->i_nlink || !ii->i_root || unlikely(is_bad_inode(inode))) {
if (inode->i_data.nrpages)
truncate_inode_pages(&inode->i_data, 0);
end_writeback(inode);
@ -649,12 +730,16 @@ void nilfs_evict_inode(struct inode *inode)
if (inode->i_data.nrpages)
truncate_inode_pages(&inode->i_data, 0);
/* TODO: some of the following operations may fail. */
nilfs_truncate_bmap(ii, 0);
nilfs_mark_inode_dirty(inode);
end_writeback(inode);
nilfs_ifile_delete_inode(ii->i_root->ifile, inode->i_ino);
atomic_dec(&ii->i_root->inodes_count);
nilfs_clear_inode(inode);
nilfs_free_inode(inode);
/* nilfs_free_inode() marks inode buffer dirty */
if (IS_SYNC(inode))
nilfs_set_transaction_flag(NILFS_TI_SYNC);
nilfs_transaction_commit(sb);
@ -700,6 +785,17 @@ int nilfs_setattr(struct dentry *dentry, struct iattr *iattr)
return err;
}
int nilfs_permission(struct inode *inode, int mask)
{
struct nilfs_root *root = NILFS_I(inode)->i_root;
if ((mask & MAY_WRITE) && root &&
root->cno != NILFS_CPTREE_CURRENT_CNO)
return -EROFS; /* snapshot is not writable */
return generic_permission(inode, mask, NULL);
}
int nilfs_load_inode_block(struct nilfs_sb_info *sbi, struct inode *inode,
struct buffer_head **pbh)
{
@ -709,8 +805,8 @@ int nilfs_load_inode_block(struct nilfs_sb_info *sbi, struct inode *inode,
spin_lock(&sbi->s_inode_lock);
if (ii->i_bh == NULL) {
spin_unlock(&sbi->s_inode_lock);
err = nilfs_ifile_get_inode_block(sbi->s_ifile, inode->i_ino,
pbh);
err = nilfs_ifile_get_inode_block(ii->i_root->ifile,
inode->i_ino, pbh);
if (unlikely(err))
return err;
spin_lock(&sbi->s_inode_lock);
@ -790,7 +886,7 @@ int nilfs_mark_inode_dirty(struct inode *inode)
}
nilfs_update_inode(inode, ibh);
nilfs_mdt_mark_buffer_dirty(ibh);
nilfs_mdt_mark_dirty(sbi->s_ifile);
nilfs_mdt_mark_dirty(NILFS_I(inode)->i_root->ifile);
brelse(ibh);
return 0;
}
@ -808,6 +904,7 @@ int nilfs_mark_inode_dirty(struct inode *inode)
void nilfs_dirty_inode(struct inode *inode)
{
struct nilfs_transaction_info ti;
struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
if (is_bad_inode(inode)) {
nilfs_warning(inode->i_sb, __func__,
@ -815,6 +912,10 @@ void nilfs_dirty_inode(struct inode *inode)
dump_stack();
return;
}
if (mdi) {
nilfs_mdt_mark_dirty(inode);
return;
}
nilfs_transaction_begin(inode->i_sb, &ti, 0);
nilfs_mark_inode_dirty(inode);
nilfs_transaction_commit(inode->i_sb); /* never fails */

23
fs/nilfs2/ioctl.c
View file

@ -117,7 +117,7 @@ static int nilfs_ioctl_change_cpmode(struct inode *inode, struct file *filp,
if (copy_from_user(&cpmode, argp, sizeof(cpmode)))
goto out;
mutex_lock(&nilfs->ns_mount_mutex);
down_read(&inode->i_sb->s_umount);
nilfs_transaction_begin(inode->i_sb, &ti, 0);
ret = nilfs_cpfile_change_cpmode(
@ -127,7 +127,7 @@ static int nilfs_ioctl_change_cpmode(struct inode *inode, struct file *filp,
else
nilfs_transaction_commit(inode->i_sb); /* never fails */
mutex_unlock(&nilfs->ns_mount_mutex);
up_read(&inode->i_sb->s_umount);
out:
mnt_drop_write(filp->f_path.mnt);
return ret;
@ -333,7 +333,7 @@ static int nilfs_ioctl_move_inode_block(struct inode *inode,
return 0;
}
static int nilfs_ioctl_move_blocks(struct the_nilfs *nilfs,
static int nilfs_ioctl_move_blocks(struct super_block *sb,
struct nilfs_argv *argv, void *buf)
{
size_t nmembs = argv->v_nmembs;
@ -348,7 +348,7 @@ static int nilfs_ioctl_move_blocks(struct the_nilfs *nilfs,
for (i = 0, vdesc = buf; i < nmembs; ) {
ino = vdesc->vd_ino;
cno = vdesc->vd_cno;
inode = nilfs_gc_iget(nilfs, ino, cno);
inode = nilfs_iget_for_gc(sb, ino, cno);
if (unlikely(inode == NULL)) {
ret = -ENOMEM;
goto failed;
@ -356,11 +356,15 @@ static int nilfs_ioctl_move_blocks(struct the_nilfs *nilfs,
do {
ret = nilfs_ioctl_move_inode_block(inode, vdesc,
&buffers);
if (unlikely(ret < 0))
if (unlikely(ret < 0)) {
iput(inode);
goto failed;
}
vdesc++;
} while (++i < nmembs &&
vdesc->vd_ino == ino && vdesc->vd_cno == cno);
iput(inode); /* The inode still remains in GC inode list */
}
list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
@ -566,7 +570,7 @@ static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp,
}
/*
* nilfs_ioctl_move_blocks() will call nilfs_gc_iget(),
* nilfs_ioctl_move_blocks() will call nilfs_iget_for_gc(),
* which will operates an inode list without blocking.
* To protect the list from concurrent operations,
* nilfs_ioctl_move_blocks should be atomic operation.
@ -576,15 +580,16 @@ static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp,
goto out_free;
}
ret = nilfs_ioctl_move_blocks(nilfs, &argv[0], kbufs[0]);
vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
ret = nilfs_ioctl_move_blocks(inode->i_sb, &argv[0], kbufs[0]);
if (ret < 0)
printk(KERN_ERR "NILFS: GC failed during preparation: "
"cannot read source blocks: err=%d\n", ret);
else
ret = nilfs_clean_segments(inode->i_sb, argv, kbufs);
if (ret < 0)
nilfs_remove_all_gcinode(nilfs);
nilfs_remove_all_gcinodes(nilfs);
clear_nilfs_gc_running(nilfs);
out_free:

313
fs/nilfs2/mdt.c
View file

@ -36,7 +36,6 @@
#define NILFS_MDT_MAX_RA_BLOCKS (16 - 1)
#define INIT_UNUSED_INODE_FIELDS
static int
nilfs_mdt_insert_new_block(struct inode *inode, unsigned long block,
@ -78,25 +77,11 @@ static int nilfs_mdt_create_block(struct inode *inode, unsigned long block,
struct buffer_head *,
void *))
{
struct the_nilfs *nilfs = NILFS_MDT(inode)->mi_nilfs;
struct super_block *sb = inode->i_sb;
struct nilfs_transaction_info ti;
struct buffer_head *bh;
int err;
if (!sb) {
/*
* Make sure this function is not called from any
* read-only context.
*/
if (!nilfs->ns_writer) {
WARN_ON(1);
err = -EROFS;
goto out;
}
sb = nilfs->ns_writer->s_super;
}
nilfs_transaction_begin(sb, &ti, 0);
err = -ENOMEM;
@ -112,7 +97,7 @@ static int nilfs_mdt_create_block(struct inode *inode, unsigned long block,
if (buffer_uptodate(bh))
goto failed_bh;
bh->b_bdev = nilfs->ns_bdev;
bh->b_bdev = sb->s_bdev;
err = nilfs_mdt_insert_new_block(inode, block, bh, init_block);
if (likely(!err)) {
get_bh(bh);
@ -129,7 +114,7 @@ static int nilfs_mdt_create_block(struct inode *inode, unsigned long block,
err = nilfs_transaction_commit(sb);
else
nilfs_transaction_abort(sb);
out:
return err;
}
@ -167,9 +152,7 @@ nilfs_mdt_submit_block(struct inode *inode, unsigned long blkoff,
unlock_buffer(bh);
goto failed_bh;
}
bh->b_bdev = NILFS_MDT(inode)->mi_nilfs->ns_bdev;
bh->b_blocknr = (sector_t)blknum;
set_buffer_mapped(bh);
map_bh(bh, inode->i_sb, (sector_t)blknum);
bh->b_end_io = end_buffer_read_sync;
get_bh(bh);
@ -398,35 +381,24 @@ int nilfs_mdt_fetch_dirty(struct inode *inode)
static int
nilfs_mdt_write_page(struct page *page, struct writeback_control *wbc)
{
struct inode *inode = container_of(page->mapping,
struct inode, i_data);
struct super_block *sb = inode->i_sb;
struct the_nilfs *nilfs = NILFS_MDT(inode)->mi_nilfs;
struct nilfs_sb_info *writer = NULL;
struct inode *inode;
struct super_block *sb;
int err = 0;
redirty_page_for_writepage(wbc, page);
unlock_page(page);
if (page->mapping->assoc_mapping)
return 0; /* Do not request flush for shadow page cache */
if (!sb) {
down_read(&nilfs->ns_writer_sem);
writer = nilfs->ns_writer;
if (!writer) {
up_read(&nilfs->ns_writer_sem);
return -EROFS;
}
sb = writer->s_super;
}
inode = page->mapping->host;
if (!inode)
return 0;
sb = inode->i_sb;
if (wbc->sync_mode == WB_SYNC_ALL)
err = nilfs_construct_segment(sb);
else if (wbc->for_reclaim)
nilfs_flush_segment(sb, inode->i_ino);
if (writer)
up_read(&nilfs->ns_writer_sem);
return err;
}
@ -439,105 +411,27 @@ static const struct address_space_operations def_mdt_aops = {
static const struct inode_operations def_mdt_iops;
static const struct file_operations def_mdt_fops;
/*
* NILFS2 uses pseudo inodes for meta data files such as DAT, cpfile, sufile,
* ifile, or gcinodes. This allows the B-tree code and segment constructor
* to treat them like regular files, and this helps to simplify the
* implementation.
* On the other hand, some of the pseudo inodes have an irregular point:
* They don't have valid inode->i_sb pointer because their lifetimes are
* longer than those of the super block structs; they may continue for
* several consecutive mounts/umounts. This would need discussions.
*/
/**
* nilfs_mdt_new_common - allocate a pseudo inode for metadata file
* @nilfs: nilfs object
* @sb: super block instance the metadata file belongs to
* @ino: inode number
* @gfp_mask: gfp mask for data pages
* @objsz: size of the private object attached to inode->i_private
*/
struct inode *
nilfs_mdt_new_common(struct the_nilfs *nilfs, struct super_block *sb,
ino_t ino, gfp_t gfp_mask, size_t objsz)
int nilfs_mdt_init(struct inode *inode, gfp_t gfp_mask, size_t objsz)
{
struct inode *inode = nilfs_alloc_inode_common(nilfs);
struct nilfs_mdt_info *mi;
if (!inode)
return NULL;
else {
struct address_space * const mapping = &inode->i_data;
struct nilfs_mdt_info *mi;
mi = kzalloc(max(sizeof(*mi), objsz), GFP_NOFS);
if (!mi)
return -ENOMEM;
mi = kzalloc(max(sizeof(*mi), objsz), GFP_NOFS);
if (!mi) {
nilfs_destroy_inode(inode);
return NULL;
}
mi->mi_nilfs = nilfs;
init_rwsem(&mi->mi_sem);
init_rwsem(&mi->mi_sem);
inode->i_private = mi;
inode->i_sb = sb; /* sb may be NULL for some meta data files */
inode->i_blkbits = nilfs->ns_blocksize_bits;
inode->i_flags = 0;
atomic_set(&inode->i_count, 1);
inode->i_nlink = 1;
inode->i_ino = ino;
inode->i_mode = S_IFREG;
inode->i_private = mi;
#ifdef INIT_UNUSED_INODE_FIELDS
atomic_set(&inode->i_writecount, 0);
inode->i_size = 0;
inode->i_blocks = 0;
inode->i_bytes = 0;
inode->i_generation = 0;
#ifdef CONFIG_QUOTA
memset(&inode->i_dquot, 0, sizeof(inode->i_dquot));
#endif
inode->i_pipe = NULL;
inode->i_bdev = NULL;
inode->i_cdev = NULL;
inode->i_rdev = 0;
#ifdef CONFIG_SECURITY
inode->i_security = NULL;
#endif
inode->dirtied_when = 0;
INIT_LIST_HEAD(&inode->i_list);
INIT_LIST_HEAD(&inode->i_sb_list);
inode->i_state = 0;
#endif
spin_lock_init(&inode->i_lock);
mutex_init(&inode->i_mutex);
init_rwsem(&inode->i_alloc_sem);
mapping->host = NULL; /* instead of inode */
mapping->flags = 0;
mapping_set_gfp_mask(mapping, gfp_mask);
mapping->assoc_mapping = NULL;
mapping->backing_dev_info = nilfs->ns_bdi;
inode->i_mapping = mapping;
}
return inode;
}
struct inode *nilfs_mdt_new(struct the_nilfs *nilfs, struct super_block *sb,
ino_t ino, size_t objsz)
{
struct inode *inode;
inode = nilfs_mdt_new_common(nilfs, sb, ino, NILFS_MDT_GFP, objsz);
if (!inode)
return NULL;
inode->i_mode = S_IFREG;
mapping_set_gfp_mask(inode->i_mapping, gfp_mask);
inode->i_mapping->backing_dev_info = inode->i_sb->s_bdi;
inode->i_op = &def_mdt_iops;
inode->i_fop = &def_mdt_fops;
inode->i_mapping->a_ops = &def_mdt_aops;
return inode;
return 0;
}
void nilfs_mdt_set_entry_size(struct inode *inode, unsigned entry_size,
@ -550,34 +444,159 @@ void nilfs_mdt_set_entry_size(struct inode *inode, unsigned entry_size,
mi->mi_first_entry_offset = DIV_ROUND_UP(header_size, entry_size);
}
void nilfs_mdt_set_shadow(struct inode *orig, struct inode *shadow)
static const struct address_space_operations shadow_map_aops = {
.sync_page = block_sync_page,
};
/**
* nilfs_mdt_setup_shadow_map - setup shadow map and bind it to metadata file
* @inode: inode of the metadata file
* @shadow: shadow mapping
*/
int nilfs_mdt_setup_shadow_map(struct inode *inode,
struct nilfs_shadow_map *shadow)
{
shadow->i_mapping->assoc_mapping = orig->i_mapping;
NILFS_I(shadow)->i_btnode_cache.assoc_mapping =
&NILFS_I(orig)->i_btnode_cache;
struct nilfs_mdt_info *mi = NILFS_MDT(inode);
struct backing_dev_info *bdi = inode->i_sb->s_bdi;
INIT_LIST_HEAD(&shadow->frozen_buffers);
nilfs_mapping_init_once(&shadow->frozen_data);
nilfs_mapping_init(&shadow->frozen_data, bdi, &shadow_map_aops);
nilfs_mapping_init_once(&shadow->frozen_btnodes);
nilfs_mapping_init(&shadow->frozen_btnodes, bdi, &shadow_map_aops);
mi->mi_shadow = shadow;
return 0;
}
static void nilfs_mdt_clear(struct inode *inode)
/**
* nilfs_mdt_save_to_shadow_map - copy bmap and dirty pages to shadow map
* @inode: inode of the metadata file
*/
int nilfs_mdt_save_to_shadow_map(struct inode *inode)
{
struct nilfs_mdt_info *mi = NILFS_MDT(inode);
struct nilfs_inode_info *ii = NILFS_I(inode);
struct nilfs_shadow_map *shadow = mi->mi_shadow;
int ret;
invalidate_mapping_pages(inode->i_mapping, 0, -1);
truncate_inode_pages(inode->i_mapping, 0);
ret = nilfs_copy_dirty_pages(&shadow->frozen_data, inode->i_mapping);
if (ret)
goto out;
if (test_bit(NILFS_I_BMAP, &ii->i_state))
nilfs_bmap_clear(ii->i_bmap);
nilfs_btnode_cache_clear(&ii->i_btnode_cache);
ret = nilfs_copy_dirty_pages(&shadow->frozen_btnodes,
&ii->i_btnode_cache);
if (ret)
goto out;
nilfs_bmap_save(ii->i_bmap, &shadow->bmap_store);
out:
return ret;
}
void nilfs_mdt_destroy(struct inode *inode)
int nilfs_mdt_freeze_buffer(struct inode *inode, struct buffer_head *bh)
{
struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
struct nilfs_shadow_map *shadow = NILFS_MDT(inode)->mi_shadow;
struct buffer_head *bh_frozen;
struct page *page;
int blkbits = inode->i_blkbits;
int ret = -ENOMEM;
if (mdi->mi_palloc_cache)
nilfs_palloc_destroy_cache(inode);
nilfs_mdt_clear(inode);
page = grab_cache_page(&shadow->frozen_data, bh->b_page->index);
if (!page)
return ret;
kfree(mdi->mi_bgl); /* kfree(NULL) is safe */
kfree(mdi);
nilfs_destroy_inode(inode);
if (!page_has_buffers(page))
create_empty_buffers(page, 1 << blkbits, 0);
bh_frozen = nilfs_page_get_nth_block(page, bh_offset(bh) >> blkbits);
if (bh_frozen) {
if (!buffer_uptodate(bh_frozen))
nilfs_copy_buffer(bh_frozen, bh);
if (list_empty(&bh_frozen->b_assoc_buffers)) {
list_add_tail(&bh_frozen->b_assoc_buffers,
&shadow->frozen_buffers);
set_buffer_nilfs_redirected(bh);
} else {
brelse(bh_frozen); /* already frozen */
}
ret = 0;
}
unlock_page(page);
page_cache_release(page);
return ret;
}
struct buffer_head *
nilfs_mdt_get_frozen_buffer(struct inode *inode, struct buffer_head *bh)
{
struct nilfs_shadow_map *shadow = NILFS_MDT(inode)->mi_shadow;
struct buffer_head *bh_frozen = NULL;
struct page *page;
int n;
page = find_lock_page(&shadow->frozen_data, bh->b_page->index);
if (page) {
if (page_has_buffers(page)) {
n = bh_offset(bh) >> inode->i_blkbits;
bh_frozen = nilfs_page_get_nth_block(page, n);
}
unlock_page(page);
page_cache_release(page);
}
return bh_frozen;
}
static void nilfs_release_frozen_buffers(struct nilfs_shadow_map *shadow)
{
struct list_head *head = &shadow->frozen_buffers;
struct buffer_head *bh;
while (!list_empty(head)) {
bh = list_first_entry(head, struct buffer_head,
b_assoc_buffers);
list_del_init(&bh->b_assoc_buffers);
brelse(bh); /* drop ref-count to make it releasable */
}
}
/**
* nilfs_mdt_restore_from_shadow_map - restore dirty pages and bmap state
* @inode: inode of the metadata file
*/
void nilfs_mdt_restore_from_shadow_map(struct inode *inode)
{
struct nilfs_mdt_info *mi = NILFS_MDT(inode);
struct nilfs_inode_info *ii = NILFS_I(inode);
struct nilfs_shadow_map *shadow = mi->mi_shadow;
down_write(&mi->mi_sem);
if (mi->mi_palloc_cache)
nilfs_palloc_clear_cache(inode);
nilfs_clear_dirty_pages(inode->i_mapping);
nilfs_copy_back_pages(inode->i_mapping, &shadow->frozen_data);
nilfs_clear_dirty_pages(&ii->i_btnode_cache);
nilfs_copy_back_pages(&ii->i_btnode_cache, &shadow->frozen_btnodes);
nilfs_bmap_restore(ii->i_bmap, &shadow->bmap_store);
up_write(&mi->mi_sem);
}
/**
* nilfs_mdt_clear_shadow_map - truncate pages in shadow map caches
* @inode: inode of the metadata file
*/
void nilfs_mdt_clear_shadow_map(struct inode *inode)
{
struct nilfs_mdt_info *mi = NILFS_MDT(inode);
struct nilfs_shadow_map *shadow = mi->mi_shadow;
down_write(&mi->mi_sem);
nilfs_release_frozen_buffers(shadow);
truncate_inode_pages(&shadow->frozen_data, 0);
truncate_inode_pages(&shadow->frozen_btnodes, 0);
up_write(&mi->mi_sem);
}

32
fs/nilfs2/mdt.h
View file

@ -28,26 +28,33 @@
#include "nilfs.h"
#include "page.h"
struct nilfs_shadow_map {
struct nilfs_bmap_store bmap_store;
struct address_space frozen_data;
struct address_space frozen_btnodes;
struct list_head frozen_buffers;
};
/**
* struct nilfs_mdt_info - on-memory private data of meta data files
* @mi_nilfs: back pointer to the_nilfs struct
* @mi_sem: reader/writer semaphore for meta data operations
* @mi_bgl: per-blockgroup locking
* @mi_entry_size: size of an entry
* @mi_first_entry_offset: offset to the first entry
* @mi_entries_per_block: number of entries in a block
* @mi_palloc_cache: persistent object allocator cache
* @mi_shadow: shadow of bmap and page caches
* @mi_blocks_per_group: number of blocks in a group
* @mi_blocks_per_desc_block: number of blocks per descriptor block
*/
struct nilfs_mdt_info {
struct the_nilfs *mi_nilfs;
struct rw_semaphore mi_sem;
struct blockgroup_lock *mi_bgl;
unsigned mi_entry_size;
unsigned mi_first_entry_offset;
unsigned long mi_entries_per_block;
struct nilfs_palloc_cache *mi_palloc_cache;
struct nilfs_shadow_map *mi_shadow;
unsigned long mi_blocks_per_group;
unsigned long mi_blocks_per_desc_block;
};
@ -59,9 +66,7 @@ static inline struct nilfs_mdt_info *NILFS_MDT(const struct inode *inode)
static inline struct the_nilfs *NILFS_I_NILFS(struct inode *inode)
{
struct super_block *sb = inode->i_sb;
return sb ? NILFS_SB(sb)->s_nilfs : NILFS_MDT(inode)->mi_nilfs;
return NILFS_SB(inode->i_sb)->s_nilfs;
}
/* Default GFP flags using highmem */
@ -76,14 +81,17 @@ int nilfs_mdt_forget_block(struct inode *, unsigned long);
int nilfs_mdt_mark_block_dirty(struct inode *, unsigned long);
int nilfs_mdt_fetch_dirty(struct inode *);
struct inode *nilfs_mdt_new(struct the_nilfs *, struct super_block *, ino_t,
size_t);
struct inode *nilfs_mdt_new_common(struct the_nilfs *, struct super_block *,
ino_t, gfp_t, size_t);
void nilfs_mdt_destroy(struct inode *);
int nilfs_mdt_init(struct inode *inode, gfp_t gfp_mask, size_t objsz);
void nilfs_mdt_set_entry_size(struct inode *, unsigned, unsigned);
void nilfs_mdt_set_shadow(struct inode *, struct inode *);
int nilfs_mdt_setup_shadow_map(struct inode *inode,
struct nilfs_shadow_map *shadow);
int nilfs_mdt_save_to_shadow_map(struct inode *inode);
void nilfs_mdt_restore_from_shadow_map(struct inode *inode);
void nilfs_mdt_clear_shadow_map(struct inode *inode);
int nilfs_mdt_freeze_buffer(struct inode *inode, struct buffer_head *bh);
struct buffer_head *nilfs_mdt_get_frozen_buffer(struct inode *inode,
struct buffer_head *bh);
#define nilfs_mdt_mark_buffer_dirty(bh) nilfs_mark_buffer_dirty(bh)
@ -100,7 +108,7 @@ static inline void nilfs_mdt_clear_dirty(struct inode *inode)
static inline __u64 nilfs_mdt_cno(struct inode *inode)
{
return NILFS_MDT(inode)->mi_nilfs->ns_cno;
return NILFS_I_NILFS(inode)->ns_cno;
}
#define nilfs_mdt_bgl_lock(inode, bg) \

139
fs/nilfs2/namei.c
View file

@ -40,7 +40,11 @@
#include <linux/pagemap.h>
#include "nilfs.h"
#include "export.h"
#define NILFS_FID_SIZE_NON_CONNECTABLE \
(offsetof(struct nilfs_fid, parent_gen) / 4)
#define NILFS_FID_SIZE_CONNECTABLE (sizeof(struct nilfs_fid) / 4)
static inline int nilfs_add_nondir(struct dentry *dentry, struct inode *inode)
{
@ -70,29 +74,13 @@ nilfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
ino = nilfs_inode_by_name(dir, &dentry->d_name);
inode = NULL;
if (ino) {
inode = nilfs_iget(dir->i_sb, ino);
inode = nilfs_iget(dir->i_sb, NILFS_I(dir)->i_root, ino);
if (IS_ERR(inode))
return ERR_CAST(inode);
}
return d_splice_alias(inode, dentry);
}
struct dentry *nilfs_get_parent(struct dentry *child)
{
unsigned long ino;
struct inode *inode;
struct qstr dotdot = {.name = "..", .len = 2};
ino = nilfs_inode_by_name(child->d_inode, &dotdot);
if (!ino)
return ERR_PTR(-ENOENT);
inode = nilfs_iget(child->d_inode->i_sb, ino);
if (IS_ERR(inode))
return ERR_CAST(inode);
return d_obtain_alias(inode);
}
/*
* By the time this is called, we already have created
* the directory cache entry for the new file, but it
@ -468,6 +456,115 @@ static int nilfs_rename(struct inode *old_dir, struct dentry *old_dentry,
return err;
}
/*
* Export operations
*/
static struct dentry *nilfs_get_parent(struct dentry *child)
{
unsigned long ino;
struct inode *inode;
struct qstr dotdot = {.name = "..", .len = 2};
struct nilfs_root *root;
ino = nilfs_inode_by_name(child->d_inode, &dotdot);
if (!ino)
return ERR_PTR(-ENOENT);
root = NILFS_I(child->d_inode)->i_root;
inode = nilfs_iget(child->d_inode->i_sb, root, ino);
if (IS_ERR(inode))
return ERR_CAST(inode);
return d_obtain_alias(inode);
}
static struct dentry *nilfs_get_dentry(struct super_block *sb, u64 cno,
u64 ino, u32 gen)
{
struct nilfs_root *root;
struct inode *inode;
if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO)
return ERR_PTR(-ESTALE);
root = nilfs_lookup_root(NILFS_SB(sb)->s_nilfs, cno);
if (!root)
return ERR_PTR(-ESTALE);
inode = nilfs_iget(sb, root, ino);
nilfs_put_root(root);
if (IS_ERR(inode))
return ERR_CAST(inode);
if (gen && inode->i_generation != gen) {
iput(inode);
return ERR_PTR(-ESTALE);
}
return d_obtain_alias(inode);
}
static struct dentry *nilfs_fh_to_dentry(struct super_block *sb, struct fid *fh,
int fh_len, int fh_type)
{
struct nilfs_fid *fid = (struct nilfs_fid *)fh;
if ((fh_len != NILFS_FID_SIZE_NON_CONNECTABLE &&
fh_len != NILFS_FID_SIZE_CONNECTABLE) ||
(fh_type != FILEID_NILFS_WITH_PARENT &&
fh_type != FILEID_NILFS_WITHOUT_PARENT))
return NULL;
return nilfs_get_dentry(sb, fid->cno, fid->ino, fid->gen);
}
static struct dentry *nilfs_fh_to_parent(struct super_block *sb, struct fid *fh,
int fh_len, int fh_type)
{
struct nilfs_fid *fid = (struct nilfs_fid *)fh;
if (fh_len != NILFS_FID_SIZE_CONNECTABLE ||
fh_type != FILEID_NILFS_WITH_PARENT)
return NULL;
return nilfs_get_dentry(sb, fid->cno, fid->parent_ino, fid->parent_gen);
}
static int nilfs_encode_fh(struct dentry *dentry, __u32 *fh, int *lenp,
int connectable)
{
struct nilfs_fid *fid = (struct nilfs_fid *)fh;
struct inode *inode = dentry->d_inode;
struct nilfs_root *root = NILFS_I(inode)->i_root;
int type;
if (*lenp < NILFS_FID_SIZE_NON_CONNECTABLE ||
(connectable && *lenp < NILFS_FID_SIZE_CONNECTABLE))
return 255;
fid->cno = root->cno;
fid->ino = inode->i_ino;
fid->gen = inode->i_generation;
if (connectable && !S_ISDIR(inode->i_mode)) {
struct inode *parent;
spin_lock(&dentry->d_lock);
parent = dentry->d_parent->d_inode;
fid->parent_ino = parent->i_ino;
fid->parent_gen = parent->i_generation;
spin_unlock(&dentry->d_lock);
type = FILEID_NILFS_WITH_PARENT;
*lenp = NILFS_FID_SIZE_CONNECTABLE;
} else {
type = FILEID_NILFS_WITHOUT_PARENT;
*lenp = NILFS_FID_SIZE_NON_CONNECTABLE;
}
return type;
}
const struct inode_operations nilfs_dir_inode_operations = {
.create = nilfs_create,
.lookup = nilfs_lookup,
@ -491,4 +588,12 @@ const struct inode_operations nilfs_symlink_inode_operations = {
.readlink = generic_readlink,
.follow_link = page_follow_link_light,
.put_link = page_put_link,
.permission = nilfs_permission,
};
const struct export_operations nilfs_export_ops = {
.encode_fh = nilfs_encode_fh,
.fh_to_dentry = nilfs_fh_to_dentry,
.fh_to_parent = nilfs_fh_to_parent,
.get_parent = nilfs_get_parent,
};

38
fs/nilfs2/nilfs.h
View file

@ -59,6 +59,7 @@ struct nilfs_inode_info {
#endif
struct buffer_head *i_bh; /* i_bh contains a new or dirty
disk inode */
struct nilfs_root *i_root;
struct inode vfs_inode;
};
@ -100,7 +101,6 @@ enum {
NILFS_I_INODE_DIRTY, /* write_inode is requested */
NILFS_I_BMAP, /* has bmap and btnode_cache */
NILFS_I_GCINODE, /* inode for GC, on memory only */
NILFS_I_GCDAT, /* shadow DAT, on memory only */
};
/*
@ -192,7 +192,7 @@ static inline int nilfs_doing_construction(void)
static inline struct inode *nilfs_dat_inode(const struct the_nilfs *nilfs)
{
return nilfs_doing_gc() ? nilfs->ns_gc_dat : nilfs->ns_dat;
return nilfs->ns_dat;
}
/*
@ -200,12 +200,9 @@ static inline struct inode *nilfs_dat_inode(const struct the_nilfs *nilfs)
*/
#ifdef CONFIG_NILFS_POSIX_ACL
#error "NILFS: not yet supported POSIX ACL"
extern int nilfs_permission(struct inode *, int, struct nameidata *);
extern int nilfs_acl_chmod(struct inode *);
extern int nilfs_init_acl(struct inode *, struct inode *);
#else
#define nilfs_permission NULL
static inline int nilfs_acl_chmod(struct inode *inode)
{
return 0;
@ -247,11 +244,19 @@ extern int nilfs_get_block(struct inode *, sector_t, struct buffer_head *, int);
extern void nilfs_set_inode_flags(struct inode *);
extern int nilfs_read_inode_common(struct inode *, struct nilfs_inode *);
extern void nilfs_write_inode_common(struct inode *, struct nilfs_inode *, int);
extern struct inode *nilfs_iget(struct super_block *, unsigned long);
struct inode *nilfs_ilookup(struct super_block *sb, struct nilfs_root *root,
unsigned long ino);
struct inode *nilfs_iget_locked(struct super_block *sb, struct nilfs_root *root,
unsigned long ino);
struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root,
unsigned long ino);
extern struct inode *nilfs_iget_for_gc(struct super_block *sb,
unsigned long ino, __u64 cno);
extern void nilfs_update_inode(struct inode *, struct buffer_head *);
extern void nilfs_truncate(struct inode *);
extern void nilfs_evict_inode(struct inode *);
extern int nilfs_setattr(struct dentry *, struct iattr *);
int nilfs_permission(struct inode *inode, int mask);
extern int nilfs_load_inode_block(struct nilfs_sb_info *, struct inode *,
struct buffer_head **);
extern int nilfs_inode_dirty(struct inode *);
@ -260,11 +265,7 @@ extern int nilfs_set_file_dirty(struct nilfs_sb_info *, struct inode *,
extern int nilfs_mark_inode_dirty(struct inode *);
extern void nilfs_dirty_inode(struct inode *);
/* namei.c */
extern struct dentry *nilfs_get_parent(struct dentry *);
/* super.c */
extern struct inode *nilfs_alloc_inode_common(struct the_nilfs *);
extern struct inode *nilfs_alloc_inode(struct super_block *);
extern void nilfs_destroy_inode(struct inode *);
extern void nilfs_error(struct super_block *, const char *, const char *, ...)
@ -283,8 +284,9 @@ extern struct nilfs_super_block **nilfs_prepare_super(struct nilfs_sb_info *,
int flip);
extern int nilfs_commit_super(struct nilfs_sb_info *, int);
extern int nilfs_cleanup_super(struct nilfs_sb_info *);
extern int nilfs_attach_checkpoint(struct nilfs_sb_info *, __u64);
extern void nilfs_detach_checkpoint(struct nilfs_sb_info *);
int nilfs_attach_checkpoint(struct nilfs_sb_info *sbi, __u64 cno, int curr_mnt,
struct nilfs_root **root);
int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno);
/* gcinode.c */
int nilfs_gccache_submit_read_data(struct inode *, sector_t, sector_t, __u64,
@ -292,16 +294,8 @@ int nilfs_gccache_submit_read_data(struct inode *, sector_t, sector_t, __u64,
int nilfs_gccache_submit_read_node(struct inode *, sector_t, __u64,
struct buffer_head **);
int nilfs_gccache_wait_and_mark_dirty(struct buffer_head *);
int nilfs_init_gccache(struct the_nilfs *);
void nilfs_destroy_gccache(struct the_nilfs *);
void nilfs_clear_gcinode(struct inode *);
struct inode *nilfs_gc_iget(struct the_nilfs *, ino_t, __u64);
void nilfs_remove_all_gcinode(struct the_nilfs *);
/* gcdat.c */
int nilfs_init_gcdat_inode(struct the_nilfs *);
void nilfs_commit_gcdat_inode(struct the_nilfs *);
void nilfs_clear_gcdat_inode(struct the_nilfs *);
int nilfs_init_gcinode(struct inode *inode);
void nilfs_remove_all_gcinodes(struct the_nilfs *nilfs);
/*
* Inodes and files operations

55
fs/nilfs2/page.c
View file

@ -79,8 +79,8 @@ struct buffer_head *nilfs_grab_buffer(struct inode *inode,
{
int blkbits = inode->i_blkbits;
pgoff_t index = blkoff >> (PAGE_CACHE_SHIFT - blkbits);
struct page *page, *opage;
struct buffer_head *bh, *obh;
struct page *page;
struct buffer_head *bh;
page = grab_cache_page(mapping, index);
if (unlikely(!page))
@ -92,30 +92,6 @@ struct buffer_head *nilfs_grab_buffer(struct inode *inode,
page_cache_release(page);
return NULL;
}
if (!buffer_uptodate(bh) && mapping->assoc_mapping != NULL) {
/*
* Shadow page cache uses assoc_mapping to point its original
* page cache. The following code tries the original cache
* if the given cache is a shadow and it didn't hit.
*/
opage = find_lock_page(mapping->assoc_mapping, index);
if (!opage)
return bh;
obh = __nilfs_get_page_block(opage, blkoff, index, blkbits,
b_state);
if (buffer_uptodate(obh)) {
nilfs_copy_buffer(bh, obh);
if (buffer_dirty(obh)) {
nilfs_mark_buffer_dirty(bh);
if (!buffer_nilfs_node(bh) && NILFS_MDT(inode))
nilfs_mdt_mark_dirty(inode);
}
}
brelse(obh);
unlock_page(opage);
page_cache_release(opage);
}
return bh;
}
@ -131,6 +107,7 @@ void nilfs_forget_buffer(struct buffer_head *bh)
lock_buffer(bh);
clear_buffer_nilfs_volatile(bh);
clear_buffer_nilfs_checked(bh);
clear_buffer_nilfs_redirected(bh);
clear_buffer_dirty(bh);
if (nilfs_page_buffers_clean(page))
__nilfs_clear_page_dirty(page);
@ -483,6 +460,7 @@ void nilfs_clear_dirty_pages(struct address_space *mapping)
clear_buffer_dirty(bh);
clear_buffer_nilfs_volatile(bh);
clear_buffer_nilfs_checked(bh);
clear_buffer_nilfs_redirected(bh);
clear_buffer_uptodate(bh);
clear_buffer_mapped(bh);
unlock_buffer(bh);
@ -513,6 +491,31 @@ unsigned nilfs_page_count_clean_buffers(struct page *page,
}
return nc;
}
void nilfs_mapping_init_once(struct address_space *mapping)
{
memset(mapping, 0, sizeof(*mapping));
INIT_RADIX_TREE(&mapping->page_tree, GFP_ATOMIC);
spin_lock_init(&mapping->tree_lock);
INIT_LIST_HEAD(&mapping->private_list);
spin_lock_init(&mapping->private_lock);
spin_lock_init(&mapping->i_mmap_lock);
INIT_RAW_PRIO_TREE_ROOT(&mapping->i_mmap);
INIT_LIST_HEAD(&mapping->i_mmap_nonlinear);
}
void nilfs_mapping_init(struct address_space *mapping,
struct backing_dev_info *bdi,
const struct address_space_operations *aops)
{
mapping->host = NULL;
mapping->flags = 0;
mapping_set_gfp_mask(mapping, GFP_NOFS);
mapping->assoc_mapping = NULL;
mapping->backing_dev_info = bdi;
mapping->a_ops = aops;
}
/*
* NILFS2 needs clear_page_dirty() in the following two cases:

6
fs/nilfs2/page.h
View file

@ -35,12 +35,14 @@ enum {
BH_NILFS_Node,
BH_NILFS_Volatile,
BH_NILFS_Checked,
BH_NILFS_Redirected,
};
BUFFER_FNS(NILFS_Allocated, nilfs_allocated) /* nilfs private buffers */
BUFFER_FNS(NILFS_Node, nilfs_node) /* nilfs node buffers */
BUFFER_FNS(NILFS_Volatile, nilfs_volatile)
BUFFER_FNS(NILFS_Checked, nilfs_checked) /* buffer is verified */
BUFFER_FNS(NILFS_Redirected, nilfs_redirected) /* redirected to a copy */
void nilfs_mark_buffer_dirty(struct buffer_head *bh);
@ -59,6 +61,10 @@ void nilfs_free_private_page(struct page *);
int nilfs_copy_dirty_pages(struct address_space *, struct address_space *);
void nilfs_copy_back_pages(struct address_space *, struct address_space *);
void nilfs_clear_dirty_pages(struct address_space *);
void nilfs_mapping_init_once(struct address_space *mapping);
void nilfs_mapping_init(struct address_space *mapping,
struct backing_dev_info *bdi,
const struct address_space_operations *aops);
unsigned nilfs_page_count_clean_buffers(struct page *, unsigned, unsigned);
#define NILFS_PAGE_BUG(page, m, a...) \

19
fs/nilfs2/recovery.c
View file

@ -440,7 +440,6 @@ static int nilfs_prepare_segment_for_recovery(struct the_nilfs *nilfs,
segnum[2] = ri->ri_segnum;
segnum[3] = ri->ri_nextnum;
nilfs_attach_writer(nilfs, sbi);
/*
* Releasing the next segment of the latest super root.
* The next segment is invalidated by this recovery.
@ -480,7 +479,6 @@ static int nilfs_prepare_segment_for_recovery(struct the_nilfs *nilfs,
failed:
/* No need to recover sufile because it will be destroyed on error */
nilfs_detach_writer(nilfs, sbi);
return err;
}
@ -504,6 +502,7 @@ static int nilfs_recovery_copy_block(struct the_nilfs *nilfs,
static int nilfs_recover_dsync_blocks(struct the_nilfs *nilfs,
struct nilfs_sb_info *sbi,
struct nilfs_root *root,
struct list_head *head,
unsigned long *nr_salvaged_blocks)
{
@ -515,7 +514,7 @@ static int nilfs_recover_dsync_blocks(struct the_nilfs *nilfs,
int err = 0, err2 = 0;
list_for_each_entry_safe(rb, n, head, list) {
inode = nilfs_iget(sbi->s_super, rb->ino);
inode = nilfs_iget(sbi->s_super, root, rb->ino);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
inode = NULL;
@ -578,6 +577,7 @@ static int nilfs_recover_dsync_blocks(struct the_nilfs *nilfs,
*/
static int nilfs_do_roll_forward(struct the_nilfs *nilfs,
struct nilfs_sb_info *sbi,
struct nilfs_root *root,
struct nilfs_recovery_info *ri)
{
struct buffer_head *bh_sum = NULL;
@ -597,7 +597,6 @@ static int nilfs_do_roll_forward(struct the_nilfs *nilfs,
};
int state = RF_INIT_ST;
nilfs_attach_writer(nilfs, sbi);
pseg_start = ri->ri_lsegs_start;
seg_seq = ri->ri_lsegs_start_seq;
segnum = nilfs_get_segnum_of_block(nilfs, pseg_start);
@ -649,7 +648,7 @@ static int nilfs_do_roll_forward(struct the_nilfs *nilfs,
goto failed;
if (flags & NILFS_SS_LOGEND) {
err = nilfs_recover_dsync_blocks(
nilfs, sbi, &dsync_blocks,
nilfs, sbi, root, &dsync_blocks,
&nsalvaged_blocks);
if (unlikely(err))
goto failed;
@ -688,7 +687,6 @@ static int nilfs_do_roll_forward(struct the_nilfs *nilfs,
out:
brelse(bh_sum);
dispose_recovery_list(&dsync_blocks);
nilfs_detach_writer(nilfs, sbi);
return err;
confused:
@ -746,19 +744,20 @@ int nilfs_salvage_orphan_logs(struct the_nilfs *nilfs,
struct nilfs_sb_info *sbi,
struct nilfs_recovery_info *ri)
{
struct nilfs_root *root;
int err;
if (ri->ri_lsegs_start == 0 || ri->ri_lsegs_end == 0)
return 0;
err = nilfs_attach_checkpoint(sbi, ri->ri_cno);
err = nilfs_attach_checkpoint(sbi, ri->ri_cno, true, &root);
if (unlikely(err)) {
printk(KERN_ERR
"NILFS: error loading the latest checkpoint.\n");
return err;
}
err = nilfs_do_roll_forward(nilfs, sbi, ri);
err = nilfs_do_roll_forward(nilfs, sbi, root, ri);
if (unlikely(err))
goto failed;
@ -770,7 +769,7 @@ int nilfs_salvage_orphan_logs(struct the_nilfs *nilfs,
goto failed;
}
err = nilfs_attach_segment_constructor(sbi);
err = nilfs_attach_segment_constructor(sbi, root);
if (unlikely(err))
goto failed;
@ -788,7 +787,7 @@ int nilfs_salvage_orphan_logs(struct the_nilfs *nilfs,
}
failed:
nilfs_detach_checkpoint(sbi);
nilfs_put_root(root);
return err;
}

10
fs/nilfs2/sb.h
View file

@ -42,11 +42,6 @@ struct nilfs_sc_info;
* NILFS super-block data in memory
*/
struct nilfs_sb_info {
/* Snapshot status */
__u64 s_snapshot_cno; /* Checkpoint number */
atomic_t s_inodes_count;
atomic_t s_blocks_count; /* Reserved (might be deleted) */
/* Mount options */
unsigned long s_mount_opt;
uid_t s_resuid;
@ -59,8 +54,6 @@ struct nilfs_sb_info {
/* Fundamental members */
struct super_block *s_super; /* reverse pointer to super_block */
struct the_nilfs *s_nilfs;
struct list_head s_list; /* list head for nilfs->ns_supers */
atomic_t s_count; /* reference count */
/* Segment constructor */
struct list_head s_dirty_files; /* dirty files list */
@ -68,9 +61,6 @@ struct nilfs_sb_info {
spinlock_t s_inode_lock; /* Lock for the nilfs inode.
It covers s_dirty_files list */
/* Metadata files */
struct inode *s_ifile; /* index file inode */
/* Inode allocator */
spinlock_t s_next_gen_lock;
u32 s_next_generation;

3
fs/nilfs2/segbuf.c
View file

@ -371,7 +371,8 @@ static int nilfs_segbuf_submit_bio(struct nilfs_segment_buffer *segbuf,
struct bio *bio = wi->bio;
int err;
if (segbuf->sb_nbio > 0 && bdi_write_congested(wi->nilfs->ns_bdi)) {
if (segbuf->sb_nbio > 0 &&
bdi_write_congested(segbuf->sb_super->s_bdi)) {
wait_for_completion(&segbuf->sb_bio_event);
segbuf->sb_nbio--;
if (unlikely(atomic_read(&segbuf->sb_err))) {

102
fs/nilfs2/segment.c
View file

@ -191,6 +191,8 @@ int nilfs_transaction_begin(struct super_block *sb,
if (ret > 0)
return 0;
vfs_check_frozen(sb, SB_FREEZE_WRITE);
sbi = NILFS_SB(sb);
nilfs = sbi->s_nilfs;
down_read(&nilfs->ns_segctor_sem);
@ -366,8 +368,7 @@ static int nilfs_segctor_reset_segment_buffer(struct nilfs_sc_info *sci)
if (nilfs_doing_gc())
flags = NILFS_SS_GC;
err = nilfs_segbuf_reset(segbuf, flags, sci->sc_seg_ctime,
sci->sc_sbi->s_nilfs->ns_cno);
err = nilfs_segbuf_reset(segbuf, flags, sci->sc_seg_ctime, sci->sc_cno);
if (unlikely(err))
return err;
@ -440,17 +441,26 @@ static void nilfs_segctor_end_finfo(struct nilfs_sc_info *sci,
struct nilfs_finfo *finfo;
struct nilfs_inode_info *ii;
struct nilfs_segment_buffer *segbuf;
__u64 cno;
if (sci->sc_blk_cnt == 0)
return;
ii = NILFS_I(inode);
if (test_bit(NILFS_I_GCINODE, &ii->i_state))
cno = ii->i_cno;
else if (NILFS_ROOT_METADATA_FILE(inode->i_ino))
cno = 0;
else
cno = sci->sc_cno;
finfo = nilfs_segctor_map_segsum_entry(sci, &sci->sc_finfo_ptr,
sizeof(*finfo));
finfo->fi_ino = cpu_to_le64(inode->i_ino);
finfo->fi_nblocks = cpu_to_le32(sci->sc_blk_cnt);
finfo->fi_ndatablk = cpu_to_le32(sci->sc_datablk_cnt);
finfo->fi_cno = cpu_to_le64(ii->i_cno);
finfo->fi_cno = cpu_to_le64(cno);
segbuf = sci->sc_curseg;
segbuf->sb_sum.sumbytes = sci->sc_binfo_ptr.offset +
@ -755,12 +765,12 @@ static void nilfs_dispose_list(struct nilfs_sb_info *sbi,
}
}
static int nilfs_test_metadata_dirty(struct nilfs_sb_info *sbi)
static int nilfs_test_metadata_dirty(struct the_nilfs *nilfs,
struct nilfs_root *root)
{
struct the_nilfs *nilfs = sbi->s_nilfs;
int ret = 0;
if (nilfs_mdt_fetch_dirty(sbi->s_ifile))
if (nilfs_mdt_fetch_dirty(root->ifile))
ret++;
if (nilfs_mdt_fetch_dirty(nilfs->ns_cpfile))
ret++;
@ -785,7 +795,7 @@ static int nilfs_segctor_confirm(struct nilfs_sc_info *sci)
struct nilfs_sb_info *sbi = sci->sc_sbi;
int ret = 0;
if (nilfs_test_metadata_dirty(sbi))
if (nilfs_test_metadata_dirty(sbi->s_nilfs, sci->sc_root))
set_bit(NILFS_SC_DIRTY, &sci->sc_flags);
spin_lock(&sbi->s_inode_lock);
@ -801,7 +811,7 @@ static void nilfs_segctor_clear_metadata_dirty(struct nilfs_sc_info *sci)
struct nilfs_sb_info *sbi = sci->sc_sbi;
struct the_nilfs *nilfs = sbi->s_nilfs;
nilfs_mdt_clear_dirty(sbi->s_ifile);
nilfs_mdt_clear_dirty(sci->sc_root->ifile);
nilfs_mdt_clear_dirty(nilfs->ns_cpfile);
nilfs_mdt_clear_dirty(nilfs->ns_sufile);
nilfs_mdt_clear_dirty(nilfs_dat_inode(nilfs));
@ -848,9 +858,9 @@ static int nilfs_segctor_fill_in_checkpoint(struct nilfs_sc_info *sci)
raw_cp->cp_snapshot_list.ssl_next = 0;
raw_cp->cp_snapshot_list.ssl_prev = 0;
raw_cp->cp_inodes_count =
cpu_to_le64(atomic_read(&sbi->s_inodes_count));
cpu_to_le64(atomic_read(&sci->sc_root->inodes_count));
raw_cp->cp_blocks_count =
cpu_to_le64(atomic_read(&sbi->s_blocks_count));
cpu_to_le64(atomic_read(&sci->sc_root->blocks_count));
raw_cp->cp_nblk_inc =
cpu_to_le64(sci->sc_nblk_inc + sci->sc_nblk_this_inc);
raw_cp->cp_create = cpu_to_le64(sci->sc_seg_ctime);
@ -861,7 +871,8 @@ static int nilfs_segctor_fill_in_checkpoint(struct nilfs_sc_info *sci)
else
nilfs_checkpoint_set_minor(raw_cp);
nilfs_write_inode_common(sbi->s_ifile, &raw_cp->cp_ifile_inode, 1);
nilfs_write_inode_common(sci->sc_root->ifile,
&raw_cp->cp_ifile_inode, 1);
nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, nilfs->ns_cno, bh_cp);
return 0;
@ -886,13 +897,12 @@ static void nilfs_fill_in_file_bmap(struct inode *ifile,
}
}
static void nilfs_segctor_fill_in_file_bmap(struct nilfs_sc_info *sci,
struct inode *ifile)
static void nilfs_segctor_fill_in_file_bmap(struct nilfs_sc_info *sci)
{
struct nilfs_inode_info *ii;
list_for_each_entry(ii, &sci->sc_dirty_files, i_dirty) {
nilfs_fill_in_file_bmap(ifile, ii);
nilfs_fill_in_file_bmap(sci->sc_root->ifile, ii);
set_bit(NILFS_I_COLLECTED, &ii->i_state);
}
}
@ -1135,7 +1145,7 @@ static int nilfs_segctor_collect_blocks(struct nilfs_sc_info *sci, int mode)
sci->sc_stage.flags |= NILFS_CF_IFILE_STARTED;
/* Fall through */
case NILFS_ST_IFILE:
err = nilfs_segctor_scan_file(sci, sbi->s_ifile,
err = nilfs_segctor_scan_file(sci, sci->sc_root->ifile,
&nilfs_sc_file_ops);
if (unlikely(err))
break;
@ -1900,6 +1910,7 @@ static void nilfs_segctor_complete_write(struct nilfs_sc_info *sci)
set_buffer_uptodate(bh);
clear_buffer_dirty(bh);
clear_buffer_nilfs_volatile(bh);
clear_buffer_nilfs_redirected(bh);
if (bh == segbuf->sb_super_root) {
if (bh->b_page != bd_page) {
end_page_writeback(bd_page);
@ -1936,11 +1947,9 @@ static void nilfs_segctor_complete_write(struct nilfs_sc_info *sci)
nilfs_drop_collected_inodes(&sci->sc_dirty_files);
if (nilfs_doing_gc()) {
if (nilfs_doing_gc())
nilfs_drop_collected_inodes(&sci->sc_gc_inodes);
if (update_sr)
nilfs_commit_gcdat_inode(nilfs);
} else
else
nilfs->ns_nongc_ctime = sci->sc_seg_ctime;
sci->sc_nblk_inc += sci->sc_nblk_this_inc;
@ -1976,7 +1985,7 @@ static int nilfs_segctor_check_in_files(struct nilfs_sc_info *sci,
struct nilfs_sb_info *sbi)
{
struct nilfs_inode_info *ii, *n;
__u64 cno = sbi->s_nilfs->ns_cno;
struct inode *ifile = sci->sc_root->ifile;
spin_lock(&sbi->s_inode_lock);
retry:
@ -1987,14 +1996,14 @@ static int nilfs_segctor_check_in_files(struct nilfs_sc_info *sci,
spin_unlock(&sbi->s_inode_lock);
err = nilfs_ifile_get_inode_block(
sbi->s_ifile, ii->vfs_inode.i_ino, &ibh);
ifile, ii->vfs_inode.i_ino, &ibh);
if (unlikely(err)) {
nilfs_warning(sbi->s_super, __func__,
"failed to get inode block.\n");
return err;
}
nilfs_mdt_mark_buffer_dirty(ibh);
nilfs_mdt_mark_dirty(sbi->s_ifile);
nilfs_mdt_mark_dirty(ifile);
spin_lock(&sbi->s_inode_lock);
if (likely(!ii->i_bh))
ii->i_bh = ibh;
@ -2002,7 +2011,6 @@ static int nilfs_segctor_check_in_files(struct nilfs_sc_info *sci,
brelse(ibh);
goto retry;
}
ii->i_cno = cno;
clear_bit(NILFS_I_QUEUED, &ii->i_state);
set_bit(NILFS_I_BUSY, &ii->i_state);
@ -2011,8 +2019,6 @@ static int nilfs_segctor_check_in_files(struct nilfs_sc_info *sci,
}
spin_unlock(&sbi->s_inode_lock);
NILFS_I(sbi->s_ifile)->i_cno = cno;
return 0;
}
@ -2021,19 +2027,13 @@ static void nilfs_segctor_check_out_files(struct nilfs_sc_info *sci,
{
struct nilfs_transaction_info *ti = current->journal_info;
struct nilfs_inode_info *ii, *n;
__u64 cno = sbi->s_nilfs->ns_cno;
spin_lock(&sbi->s_inode_lock);
list_for_each_entry_safe(ii, n, &sci->sc_dirty_files, i_dirty) {
if (!test_and_clear_bit(NILFS_I_UPDATED, &ii->i_state) ||
test_bit(NILFS_I_DIRTY, &ii->i_state)) {
/* The current checkpoint number (=nilfs->ns_cno) is
changed between check-in and check-out only if the
super root is written out. So, we can update i_cno
for the inodes that remain in the dirty list. */
ii->i_cno = cno;
test_bit(NILFS_I_DIRTY, &ii->i_state))
continue;
}
clear_bit(NILFS_I_BUSY, &ii->i_state);
brelse(ii->i_bh);
ii->i_bh = NULL;
@ -2054,12 +2054,13 @@ static int nilfs_segctor_do_construct(struct nilfs_sc_info *sci, int mode)
int err;
sci->sc_stage.scnt = NILFS_ST_INIT;
sci->sc_cno = nilfs->ns_cno;
err = nilfs_segctor_check_in_files(sci, sbi);
if (unlikely(err))
goto out;
if (nilfs_test_metadata_dirty(sbi))
if (nilfs_test_metadata_dirty(nilfs, sci->sc_root))
set_bit(NILFS_SC_DIRTY, &sci->sc_flags);
if (nilfs_segctor_clean(sci))
@ -2091,7 +2092,7 @@ static int nilfs_segctor_do_construct(struct nilfs_sc_info *sci, int mode)
goto failed;
if (sci->sc_stage.flags & NILFS_CF_IFILE_STARTED)
nilfs_segctor_fill_in_file_bmap(sci, sbi->s_ifile);
nilfs_segctor_fill_in_file_bmap(sci);
if (mode == SC_LSEG_SR &&
sci->sc_stage.scnt >= NILFS_ST_CPFILE) {
@ -2452,9 +2453,8 @@ nilfs_remove_written_gcinodes(struct the_nilfs *nilfs, struct list_head *head)
list_for_each_entry_safe(ii, n, head, i_dirty) {
if (!test_bit(NILFS_I_UPDATED, &ii->i_state))
continue;
hlist_del_init(&ii->vfs_inode.i_hash);
list_del_init(&ii->i_dirty);
nilfs_clear_gcinode(&ii->vfs_inode);
iput(&ii->vfs_inode);
}
}
@ -2472,13 +2472,15 @@ int nilfs_clean_segments(struct super_block *sb, struct nilfs_argv *argv,
nilfs_transaction_lock(sbi, &ti, 1);
err = nilfs_init_gcdat_inode(nilfs);
err = nilfs_mdt_save_to_shadow_map(nilfs->ns_dat);
if (unlikely(err))
goto out_unlock;
err = nilfs_ioctl_prepare_clean_segments(nilfs, argv, kbufs);
if (unlikely(err))
if (unlikely(err)) {
nilfs_mdt_restore_from_shadow_map(nilfs->ns_dat);
goto out_unlock;
}
sci->sc_freesegs = kbufs[4];
sci->sc_nfreesegs = argv[4].v_nmembs;
@ -2510,7 +2512,7 @@ int nilfs_clean_segments(struct super_block *sb, struct nilfs_argv *argv,
out_unlock:
sci->sc_freesegs = NULL;
sci->sc_nfreesegs = 0;
nilfs_clear_gcdat_inode(nilfs);
nilfs_mdt_clear_shadow_map(nilfs->ns_dat);
nilfs_transaction_unlock(sbi);
return err;
}
@ -2672,6 +2674,8 @@ static int nilfs_segctor_start_thread(struct nilfs_sc_info *sci)
}
static void nilfs_segctor_kill_thread(struct nilfs_sc_info *sci)
__acquires(&sci->sc_state_lock)
__releases(&sci->sc_state_lock)
{
sci->sc_state |= NILFS_SEGCTOR_QUIT;
@ -2686,7 +2690,8 @@ static void nilfs_segctor_kill_thread(struct nilfs_sc_info *sci)
/*
* Setup & clean-up functions
*/
static struct nilfs_sc_info *nilfs_segctor_new(struct nilfs_sb_info *sbi)
static struct nilfs_sc_info *nilfs_segctor_new(struct nilfs_sb_info *sbi,
struct nilfs_root *root)
{
struct nilfs_sc_info *sci;
@ -2697,6 +2702,9 @@ static struct nilfs_sc_info *nilfs_segctor_new(struct nilfs_sb_info *sbi)
sci->sc_sbi = sbi;
sci->sc_super = sbi->s_super;
nilfs_get_root(root);
sci->sc_root = root;
init_waitqueue_head(&sci->sc_wait_request);
init_waitqueue_head(&sci->sc_wait_daemon);
init_waitqueue_head(&sci->sc_wait_task);
@ -2771,6 +2779,8 @@ static void nilfs_segctor_destroy(struct nilfs_sc_info *sci)
WARN_ON(!list_empty(&sci->sc_segbufs));
WARN_ON(!list_empty(&sci->sc_write_logs));
nilfs_put_root(sci->sc_root);
down_write(&sbi->s_nilfs->ns_segctor_sem);
del_timer_sync(&sci->sc_timer);
@ -2780,6 +2790,7 @@ static void nilfs_segctor_destroy(struct nilfs_sc_info *sci)
/**
* nilfs_attach_segment_constructor - attach a segment constructor
* @sbi: nilfs_sb_info
* @root: root object of the current filesystem tree
*
* nilfs_attach_segment_constructor() allocates a struct nilfs_sc_info,
* initializes it, and starts the segment constructor.
@ -2789,9 +2800,9 @@ static void nilfs_segctor_destroy(struct nilfs_sc_info *sci)
*
* %-ENOMEM - Insufficient memory available.
*/
int nilfs_attach_segment_constructor(struct nilfs_sb_info *sbi)
int nilfs_attach_segment_constructor(struct nilfs_sb_info *sbi,
struct nilfs_root *root)
{
struct the_nilfs *nilfs = sbi->s_nilfs;
int err;
if (NILFS_SC(sbi)) {
@ -2803,14 +2814,12 @@ int nilfs_attach_segment_constructor(struct nilfs_sb_info *sbi)
nilfs_detach_segment_constructor(sbi);
}
sbi->s_sc_info = nilfs_segctor_new(sbi);
sbi->s_sc_info = nilfs_segctor_new(sbi, root);
if (!sbi->s_sc_info)
return -ENOMEM;
nilfs_attach_writer(nilfs, sbi);
err = nilfs_segctor_start_thread(NILFS_SC(sbi));
if (err) {
nilfs_detach_writer(nilfs, sbi);
kfree(sbi->s_sc_info);
sbi->s_sc_info = NULL;
}
@ -2847,5 +2856,4 @@ void nilfs_detach_segment_constructor(struct nilfs_sb_info *sbi)
up_write(&nilfs->ns_segctor_sem);
nilfs_dispose_list(sbi, &garbage_list, 1);
nilfs_detach_writer(nilfs, sbi);
}

10
fs/nilfs2/segment.h
View file

@ -29,6 +29,8 @@
#include <linux/nilfs2_fs.h>
#include "sb.h"
struct nilfs_root;
/**
* struct nilfs_recovery_info - Recovery information
* @ri_need_recovery: Recovery status
@ -87,6 +89,7 @@ struct nilfs_segsum_pointer {
* struct nilfs_sc_info - Segment constructor information
* @sc_super: Back pointer to super_block struct
* @sc_sbi: Back pointer to nilfs_sb_info struct
* @sc_root: root object of the current filesystem tree
* @sc_nblk_inc: Block count of current generation
* @sc_dirty_files: List of files to be written
* @sc_gc_inodes: List of GC inodes having blocks to be written
@ -107,6 +110,7 @@ struct nilfs_segsum_pointer {
* @sc_datablk_cnt: Data block count of a file
* @sc_nblk_this_inc: Number of blocks included in the current logical segment
* @sc_seg_ctime: Creation time
* @sc_cno: checkpoint number of current log
* @sc_flags: Internal flags
* @sc_state_lock: spinlock for sc_state and so on
* @sc_state: Segctord state flags
@ -128,6 +132,7 @@ struct nilfs_segsum_pointer {
struct nilfs_sc_info {
struct super_block *sc_super;
struct nilfs_sb_info *sc_sbi;
struct nilfs_root *sc_root;
unsigned long sc_nblk_inc;
@ -156,7 +161,7 @@ struct nilfs_sc_info {
unsigned long sc_datablk_cnt;
unsigned long sc_nblk_this_inc;
time_t sc_seg_ctime;
__u64 sc_cno;
unsigned long sc_flags;
spinlock_t sc_state_lock;
@ -230,7 +235,8 @@ extern void nilfs_flush_segment(struct super_block *, ino_t);
extern int nilfs_clean_segments(struct super_block *, struct nilfs_argv *,
void **);
extern int nilfs_attach_segment_constructor(struct nilfs_sb_info *);
int nilfs_attach_segment_constructor(struct nilfs_sb_info *sbi,
struct nilfs_root *root);
extern void nilfs_detach_segment_constructor(struct nilfs_sb_info *);
/* recovery.c */

81
fs/nilfs2/sufile.c
View file

@ -505,7 +505,7 @@ int nilfs_sufile_get_stat(struct inode *sufile, struct nilfs_sustat *sustat)
{
struct buffer_head *header_bh;
struct nilfs_sufile_header *header;
struct the_nilfs *nilfs = NILFS_MDT(sufile)->mi_nilfs;
struct the_nilfs *nilfs = NILFS_I_NILFS(sufile);
void *kaddr;
int ret;
@ -583,7 +583,7 @@ ssize_t nilfs_sufile_get_suinfo(struct inode *sufile, __u64 segnum, void *buf,
struct nilfs_segment_usage *su;
struct nilfs_suinfo *si = buf;
size_t susz = NILFS_MDT(sufile)->mi_entry_size;
struct the_nilfs *nilfs = NILFS_MDT(sufile)->mi_nilfs;
struct the_nilfs *nilfs = NILFS_I_NILFS(sufile);
void *kaddr;
unsigned long nsegs, segusages_per_block;
ssize_t n;
@ -635,46 +635,55 @@ ssize_t nilfs_sufile_get_suinfo(struct inode *sufile, __u64 segnum, void *buf,
}
/**
* nilfs_sufile_read - read sufile inode
* @sufile: sufile inode
* nilfs_sufile_read - read or get sufile inode
* @sb: super block instance
* @susize: size of a segment usage entry
* @raw_inode: on-disk sufile inode
* @inodep: buffer to store the inode
*/
int nilfs_sufile_read(struct inode *sufile, struct nilfs_inode *raw_inode)
int nilfs_sufile_read(struct super_block *sb, size_t susize,
struct nilfs_inode *raw_inode, struct inode **inodep)
{
struct nilfs_sufile_info *sui = NILFS_SUI(sufile);
struct inode *sufile;
struct nilfs_sufile_info *sui;
struct buffer_head *header_bh;
struct nilfs_sufile_header *header;
void *kaddr;
int ret;
int err;
ret = nilfs_read_inode_common(sufile, raw_inode);
if (ret < 0)
return ret;
sufile = nilfs_iget_locked(sb, NULL, NILFS_SUFILE_INO);
if (unlikely(!sufile))
return -ENOMEM;
if (!(sufile->i_state & I_NEW))
goto out;
ret = nilfs_sufile_get_header_block(sufile, &header_bh);
if (!ret) {
kaddr = kmap_atomic(header_bh->b_page, KM_USER0);
header = kaddr + bh_offset(header_bh);
sui->ncleansegs = le64_to_cpu(header->sh_ncleansegs);
kunmap_atomic(kaddr, KM_USER0);
brelse(header_bh);
}
return ret;
}
/**
* nilfs_sufile_new - create sufile
* @nilfs: nilfs object
* @susize: size of a segment usage entry
*/
struct inode *nilfs_sufile_new(struct the_nilfs *nilfs, size_t susize)
{
struct inode *sufile;
sufile = nilfs_mdt_new(nilfs, NULL, NILFS_SUFILE_INO,
sizeof(struct nilfs_sufile_info));
if (sufile)
nilfs_mdt_set_entry_size(sufile, susize,
sizeof(struct nilfs_sufile_header));
return sufile;
err = nilfs_mdt_init(sufile, NILFS_MDT_GFP, sizeof(*sui));
if (err)
goto failed;
nilfs_mdt_set_entry_size(sufile, susize,
sizeof(struct nilfs_sufile_header));
err = nilfs_read_inode_common(sufile, raw_inode);
if (err)
goto failed;
err = nilfs_sufile_get_header_block(sufile, &header_bh);
if (err)
goto failed;
sui = NILFS_SUI(sufile);
kaddr = kmap_atomic(header_bh->b_page, KM_USER0);
header = kaddr + bh_offset(header_bh);
sui->ncleansegs = le64_to_cpu(header->sh_ncleansegs);
kunmap_atomic(kaddr, KM_USER0);
brelse(header_bh);
unlock_new_inode(sufile);
out:
*inodep = sufile;
return 0;
failed:
iget_failed(sufile);
return err;
}

6
fs/nilfs2/sufile.h
View file

@ -31,7 +31,7 @@
static inline unsigned long nilfs_sufile_get_nsegments(struct inode *sufile)
{
return NILFS_MDT(sufile)->mi_nilfs->ns_nsegments;
return NILFS_I_NILFS(sufile)->ns_nsegments;
}
unsigned long nilfs_sufile_get_ncleansegs(struct inode *sufile);
@ -61,8 +61,8 @@ void nilfs_sufile_do_cancel_free(struct inode *, __u64, struct buffer_head *,
void nilfs_sufile_do_set_error(struct inode *, __u64, struct buffer_head *,
struct buffer_head *);
int nilfs_sufile_read(struct inode *sufile, struct nilfs_inode *raw_inode);
struct inode *nilfs_sufile_new(struct the_nilfs *nilfs, size_t susize);
int nilfs_sufile_read(struct super_block *sb, size_t susize,
struct nilfs_inode *raw_inode, struct inode **inodep);
/**
* nilfs_sufile_scrap - make a segment garbage

613
fs/nilfs2/super.c
View file

@ -48,10 +48,10 @@
#include <linux/vfs.h>
#include <linux/writeback.h>
#include <linux/kobject.h>
#include <linux/exportfs.h>
#include <linux/seq_file.h>
#include <linux/mount.h>
#include "nilfs.h"
#include "export.h"
#include "mdt.h"
#include "alloc.h"
#include "btree.h"
@ -68,11 +68,12 @@ MODULE_DESCRIPTION("A New Implementation of the Log-structured Filesystem "
"(NILFS)");
MODULE_LICENSE("GPL");
struct kmem_cache *nilfs_inode_cachep;
static struct kmem_cache *nilfs_inode_cachep;
struct kmem_cache *nilfs_transaction_cachep;
struct kmem_cache *nilfs_segbuf_cachep;
struct kmem_cache *nilfs_btree_path_cache;
static int nilfs_setup_super(struct nilfs_sb_info *sbi, int is_mount);
static int nilfs_remount(struct super_block *sb, int *flags, char *data);
static void nilfs_set_error(struct nilfs_sb_info *sbi)
@ -146,7 +147,7 @@ void nilfs_warning(struct super_block *sb, const char *function,
}
struct inode *nilfs_alloc_inode_common(struct the_nilfs *nilfs)
struct inode *nilfs_alloc_inode(struct super_block *sb)
{
struct nilfs_inode_info *ii;
@ -155,18 +156,20 @@ struct inode *nilfs_alloc_inode_common(struct the_nilfs *nilfs)
return NULL;
ii->i_bh = NULL;
ii->i_state = 0;
ii->i_cno = 0;
ii->vfs_inode.i_version = 1;
nilfs_btnode_cache_init(&ii->i_btnode_cache, nilfs->ns_bdi);
nilfs_btnode_cache_init(&ii->i_btnode_cache, sb->s_bdi);
return &ii->vfs_inode;
}
struct inode *nilfs_alloc_inode(struct super_block *sb)
{
return nilfs_alloc_inode_common(NILFS_SB(sb)->s_nilfs);
}
void nilfs_destroy_inode(struct inode *inode)
{
struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
if (mdi) {
kfree(mdi->mi_bgl); /* kfree(NULL) is safe */
kfree(mdi);
}
kmem_cache_free(nilfs_inode_cachep, NILFS_I(inode));
}
@ -340,16 +343,15 @@ static void nilfs_put_super(struct super_block *sb)
nilfs_cleanup_super(sbi);
up_write(&nilfs->ns_sem);
}
down_write(&nilfs->ns_super_sem);
if (nilfs->ns_current == sbi)
nilfs->ns_current = NULL;
up_write(&nilfs->ns_super_sem);
nilfs_detach_checkpoint(sbi);
put_nilfs(sbi->s_nilfs);
iput(nilfs->ns_sufile);
iput(nilfs->ns_cpfile);
iput(nilfs->ns_dat);
destroy_nilfs(nilfs);
sbi->s_super = NULL;
sb->s_fs_info = NULL;
nilfs_put_sbinfo(sbi);
kfree(sbi);
}
static int nilfs_sync_fs(struct super_block *sb, int wait)
@ -376,21 +378,22 @@ static int nilfs_sync_fs(struct super_block *sb, int wait)
return err;
}
int nilfs_attach_checkpoint(struct nilfs_sb_info *sbi, __u64 cno)
int nilfs_attach_checkpoint(struct nilfs_sb_info *sbi, __u64 cno, int curr_mnt,
struct nilfs_root **rootp)
{
struct the_nilfs *nilfs = sbi->s_nilfs;
struct nilfs_root *root;
struct nilfs_checkpoint *raw_cp;
struct buffer_head *bh_cp;
int err;
int err = -ENOMEM;
down_write(&nilfs->ns_super_sem);
list_add(&sbi->s_list, &nilfs->ns_supers);
up_write(&nilfs->ns_super_sem);
root = nilfs_find_or_create_root(
nilfs, curr_mnt ? NILFS_CPTREE_CURRENT_CNO : cno);
if (!root)
return err;
err = -ENOMEM;
sbi->s_ifile = nilfs_ifile_new(sbi, nilfs->ns_inode_size);
if (!sbi->s_ifile)
goto delist;
if (root->ifile)
goto reuse; /* already attached checkpoint */
down_read(&nilfs->ns_segctor_sem);
err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp,
@ -406,45 +409,64 @@ int nilfs_attach_checkpoint(struct nilfs_sb_info *sbi, __u64 cno)
}
goto failed;
}
err = nilfs_read_inode_common(sbi->s_ifile, &raw_cp->cp_ifile_inode);
if (unlikely(err))
err = nilfs_ifile_read(sbi->s_super, root, nilfs->ns_inode_size,
&raw_cp->cp_ifile_inode, &root->ifile);
if (err)
goto failed_bh;
atomic_set(&sbi->s_inodes_count, le64_to_cpu(raw_cp->cp_inodes_count));
atomic_set(&sbi->s_blocks_count, le64_to_cpu(raw_cp->cp_blocks_count));
atomic_set(&root->inodes_count, le64_to_cpu(raw_cp->cp_inodes_count));
atomic_set(&root->blocks_count, le64_to_cpu(raw_cp->cp_blocks_count));
nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp);
reuse:
*rootp = root;
return 0;
failed_bh:
nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp);
failed:
nilfs_mdt_destroy(sbi->s_ifile);
sbi->s_ifile = NULL;
delist:
down_write(&nilfs->ns_super_sem);
list_del_init(&sbi->s_list);
up_write(&nilfs->ns_super_sem);
nilfs_put_root(root);
return err;
}
void nilfs_detach_checkpoint(struct nilfs_sb_info *sbi)
static int nilfs_freeze(struct super_block *sb)
{
struct nilfs_sb_info *sbi = NILFS_SB(sb);
struct the_nilfs *nilfs = sbi->s_nilfs;
int err;
if (sb->s_flags & MS_RDONLY)
return 0;
/* Mark super block clean */
down_write(&nilfs->ns_sem);
err = nilfs_cleanup_super(sbi);
up_write(&nilfs->ns_sem);
return err;
}
static int nilfs_unfreeze(struct super_block *sb)
{
struct nilfs_sb_info *sbi = NILFS_SB(sb);
struct the_nilfs *nilfs = sbi->s_nilfs;
nilfs_mdt_destroy(sbi->s_ifile);
sbi->s_ifile = NULL;
down_write(&nilfs->ns_super_sem);
list_del_init(&sbi->s_list);
up_write(&nilfs->ns_super_sem);
if (sb->s_flags & MS_RDONLY)
return 0;
down_write(&nilfs->ns_sem);
nilfs_setup_super(sbi, false);
up_write(&nilfs->ns_sem);
return 0;
}
static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
struct super_block *sb = dentry->d_sb;
struct nilfs_sb_info *sbi = NILFS_SB(sb);
struct the_nilfs *nilfs = sbi->s_nilfs;
struct nilfs_root *root = NILFS_I(dentry->d_inode)->i_root;
struct the_nilfs *nilfs = root->nilfs;
u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
unsigned long long blocks;
unsigned long overhead;
@ -480,7 +502,7 @@ static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf)
buf->f_bfree = nfreeblocks;
buf->f_bavail = (buf->f_bfree >= nrsvblocks) ?
(buf->f_bfree - nrsvblocks) : 0;
buf->f_files = atomic_read(&sbi->s_inodes_count);
buf->f_files = atomic_read(&root->inodes_count);
buf->f_ffree = 0; /* nilfs_count_free_inodes(sb); */
buf->f_namelen = NILFS_NAME_LEN;
buf->f_fsid.val[0] = (u32)id;
@ -493,12 +515,12 @@ static int nilfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
{
struct super_block *sb = vfs->mnt_sb;
struct nilfs_sb_info *sbi = NILFS_SB(sb);
struct nilfs_root *root = NILFS_I(vfs->mnt_root->d_inode)->i_root;
if (!nilfs_test_opt(sbi, BARRIER))
seq_puts(seq, ",nobarrier");
if (nilfs_test_opt(sbi, SNAPSHOT))
seq_printf(seq, ",cp=%llu",
(unsigned long long int)sbi->s_snapshot_cno);
if (root->cno != NILFS_CPTREE_CURRENT_CNO)
seq_printf(seq, ",cp=%llu", (unsigned long long)root->cno);
if (nilfs_test_opt(sbi, ERRORS_PANIC))
seq_puts(seq, ",errors=panic");
if (nilfs_test_opt(sbi, ERRORS_CONT))
@ -524,6 +546,8 @@ static const struct super_operations nilfs_sops = {
.put_super = nilfs_put_super,
/* .write_super = nilfs_write_super, */
.sync_fs = nilfs_sync_fs,
.freeze_fs = nilfs_freeze,
.unfreeze_fs = nilfs_unfreeze,
/* .write_super_lockfs */
/* .unlockfs */
.statfs = nilfs_statfs,
@ -532,48 +556,6 @@ static const struct super_operations nilfs_sops = {
.show_options = nilfs_show_options
};
static struct inode *
nilfs_nfs_get_inode(struct super_block *sb, u64 ino, u32 generation)
{
struct inode *inode;
if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO &&
ino != NILFS_SKETCH_INO)
return ERR_PTR(-ESTALE);
inode = nilfs_iget(sb, ino);
if (IS_ERR(inode))
return ERR_CAST(inode);
if (generation && inode->i_generation != generation) {
iput(inode);
return ERR_PTR(-ESTALE);
}
return inode;
}
static struct dentry *
nilfs_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len,
int fh_type)
{
return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
nilfs_nfs_get_inode);
}
static struct dentry *
nilfs_fh_to_parent(struct super_block *sb, struct fid *fid, int fh_len,
int fh_type)
{
return generic_fh_to_parent(sb, fid, fh_len, fh_type,
nilfs_nfs_get_inode);
}
static const struct export_operations nilfs_export_ops = {
.fh_to_dentry = nilfs_fh_to_dentry,
.fh_to_parent = nilfs_fh_to_parent,
.get_parent = nilfs_get_parent,
};
enum {
Opt_err_cont, Opt_err_panic, Opt_err_ro,
Opt_barrier, Opt_nobarrier, Opt_snapshot, Opt_order, Opt_norecovery,
@ -599,7 +581,6 @@ static int parse_options(char *options, struct super_block *sb, int is_remount)
struct nilfs_sb_info *sbi = NILFS_SB(sb);
char *p;
substring_t args[MAX_OPT_ARGS];
int option;
if (!options)
return 1;
@ -637,30 +618,12 @@ static int parse_options(char *options, struct super_block *sb, int is_remount)
nilfs_write_opt(sbi, ERROR_MODE, ERRORS_CONT);
break;
case Opt_snapshot:
if (match_int(&args[0], &option) || option <= 0)
return 0;
if (is_remount) {
if (!nilfs_test_opt(sbi, SNAPSHOT)) {
printk(KERN_ERR
"NILFS: cannot change regular "
"mount to snapshot.\n");
return 0;
} else if (option != sbi->s_snapshot_cno) {
printk(KERN_ERR
"NILFS: cannot remount to a "
"different snapshot.\n");
return 0;
}
break;
}
if (!(sb->s_flags & MS_RDONLY)) {
printk(KERN_ERR "NILFS: cannot mount snapshot "
"read/write. A read-only option is "
"required.\n");
printk(KERN_ERR
"NILFS: \"%s\" option is invalid "
"for remount.\n", p);
return 0;
}
sbi->s_snapshot_cno = option;
nilfs_set_opt(sbi, SNAPSHOT);
break;
case Opt_norecovery:
nilfs_set_opt(sbi, NORECOVERY);
@ -688,7 +651,7 @@ nilfs_set_default_options(struct nilfs_sb_info *sbi,
NILFS_MOUNT_ERRORS_RO | NILFS_MOUNT_BARRIER;
}
static int nilfs_setup_super(struct nilfs_sb_info *sbi)
static int nilfs_setup_super(struct nilfs_sb_info *sbi, int is_mount)
{
struct the_nilfs *nilfs = sbi->s_nilfs;
struct nilfs_super_block **sbp;
@ -700,6 +663,9 @@ static int nilfs_setup_super(struct nilfs_sb_info *sbi)
if (!sbp)
return -EIO;
if (!is_mount)
goto skip_mount_setup;
max_mnt_count = le16_to_cpu(sbp[0]->s_max_mnt_count);
mnt_count = le16_to_cpu(sbp[0]->s_mnt_count);
@ -716,9 +682,11 @@ static int nilfs_setup_super(struct nilfs_sb_info *sbi)
sbp[0]->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT);
sbp[0]->s_mnt_count = cpu_to_le16(mnt_count + 1);
sbp[0]->s_mtime = cpu_to_le64(get_seconds());
skip_mount_setup:
sbp[0]->s_state =
cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & ~NILFS_VALID_FS);
sbp[0]->s_mtime = cpu_to_le64(get_seconds());
/* synchronize sbp[1] with sbp[0] */
memcpy(sbp[1], sbp[0], nilfs->ns_sbsize);
return nilfs_commit_super(sbi, NILFS_SB_COMMIT_ALL);
@ -785,22 +753,156 @@ int nilfs_check_feature_compatibility(struct super_block *sb,
return 0;
}
static int nilfs_get_root_dentry(struct super_block *sb,
struct nilfs_root *root,
struct dentry **root_dentry)
{
struct inode *inode;
struct dentry *dentry;
int ret = 0;
inode = nilfs_iget(sb, root, NILFS_ROOT_INO);
if (IS_ERR(inode)) {
printk(KERN_ERR "NILFS: get root inode failed\n");
ret = PTR_ERR(inode);
goto out;
}
if (!S_ISDIR(inode->i_mode) || !inode->i_blocks || !inode->i_size) {
iput(inode);
printk(KERN_ERR "NILFS: corrupt root inode.\n");
ret = -EINVAL;
goto out;
}
if (root->cno == NILFS_CPTREE_CURRENT_CNO) {
dentry = d_find_alias(inode);
if (!dentry) {
dentry = d_alloc_root(inode);
if (!dentry) {
iput(inode);
ret = -ENOMEM;
goto failed_dentry;
}
} else {
iput(inode);
}
} else {
dentry = d_obtain_alias(inode);
if (IS_ERR(dentry)) {
ret = PTR_ERR(dentry);
goto failed_dentry;
}
}
*root_dentry = dentry;
out:
return ret;
failed_dentry:
printk(KERN_ERR "NILFS: get root dentry failed\n");
goto out;
}
static int nilfs_attach_snapshot(struct super_block *s, __u64 cno,
struct dentry **root_dentry)
{
struct the_nilfs *nilfs = NILFS_SB(s)->s_nilfs;
struct nilfs_root *root;
int ret;
down_read(&nilfs->ns_segctor_sem);
ret = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, cno);
up_read(&nilfs->ns_segctor_sem);
if (ret < 0) {
ret = (ret == -ENOENT) ? -EINVAL : ret;
goto out;
} else if (!ret) {
printk(KERN_ERR "NILFS: The specified checkpoint is "
"not a snapshot (checkpoint number=%llu).\n",
(unsigned long long)cno);
ret = -EINVAL;
goto out;
}
ret = nilfs_attach_checkpoint(NILFS_SB(s), cno, false, &root);
if (ret) {
printk(KERN_ERR "NILFS: error loading snapshot "
"(checkpoint number=%llu).\n",
(unsigned long long)cno);
goto out;
}
ret = nilfs_get_root_dentry(s, root, root_dentry);
nilfs_put_root(root);
out:
return ret;
}
static int nilfs_tree_was_touched(struct dentry *root_dentry)
{
return atomic_read(&root_dentry->d_count) > 1;
}
/**
* nilfs_try_to_shrink_tree() - try to shrink dentries of a checkpoint
* @root_dentry: root dentry of the tree to be shrunk
*
* This function returns true if the tree was in-use.
*/
static int nilfs_try_to_shrink_tree(struct dentry *root_dentry)
{
if (have_submounts(root_dentry))
return true;
shrink_dcache_parent(root_dentry);
return nilfs_tree_was_touched(root_dentry);
}
int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno)
{
struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs;
struct nilfs_root *root;
struct inode *inode;
struct dentry *dentry;
int ret;
if (cno < 0 || cno > nilfs->ns_cno)
return false;
if (cno >= nilfs_last_cno(nilfs))
return true; /* protect recent checkpoints */
ret = false;
root = nilfs_lookup_root(NILFS_SB(sb)->s_nilfs, cno);
if (root) {
inode = nilfs_ilookup(sb, root, NILFS_ROOT_INO);
if (inode) {
dentry = d_find_alias(inode);
if (dentry) {
if (nilfs_tree_was_touched(dentry))
ret = nilfs_try_to_shrink_tree(dentry);
dput(dentry);
}
iput(inode);
}
nilfs_put_root(root);
}
return ret;
}
/**
* nilfs_fill_super() - initialize a super block instance
* @sb: super_block
* @data: mount options
* @silent: silent mode flag
* @nilfs: the_nilfs struct
*
* This function is called exclusively by nilfs->ns_mount_mutex.
* So, the recovery process is protected from other simultaneous mounts.
*/
static int
nilfs_fill_super(struct super_block *sb, void *data, int silent,
struct the_nilfs *nilfs)
nilfs_fill_super(struct super_block *sb, void *data, int silent)
{
struct the_nilfs *nilfs;
struct nilfs_sb_info *sbi;
struct inode *root;
struct nilfs_root *fsroot;
struct backing_dev_info *bdi;
__u64 cno;
int err;
@ -809,19 +911,21 @@ nilfs_fill_super(struct super_block *sb, void *data, int silent,
return -ENOMEM;
sb->s_fs_info = sbi;
get_nilfs(nilfs);
sbi->s_nilfs = nilfs;
sbi->s_super = sb;
atomic_set(&sbi->s_count, 1);
nilfs = alloc_nilfs(sb->s_bdev);
if (!nilfs) {
err = -ENOMEM;
goto failed_sbi;
}
sbi->s_nilfs = nilfs;
err = init_nilfs(nilfs, sbi, (char *)data);
if (err)
goto failed_sbi;
goto failed_nilfs;
spin_lock_init(&sbi->s_inode_lock);
INIT_LIST_HEAD(&sbi->s_dirty_files);
INIT_LIST_HEAD(&sbi->s_list);
/*
* Following initialization is overlapped because
@ -837,94 +941,59 @@ nilfs_fill_super(struct super_block *sb, void *data, int silent,
sb->s_export_op = &nilfs_export_ops;
sb->s_root = NULL;
sb->s_time_gran = 1;
sb->s_bdi = nilfs->ns_bdi;
bdi = sb->s_bdev->bd_inode->i_mapping->backing_dev_info;
sb->s_bdi = bdi ? : &default_backing_dev_info;
err = load_nilfs(nilfs, sbi);
if (err)
goto failed_sbi;
goto failed_nilfs;
cno = nilfs_last_cno(nilfs);
if (sb->s_flags & MS_RDONLY) {
if (nilfs_test_opt(sbi, SNAPSHOT)) {
down_read(&nilfs->ns_segctor_sem);
err = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile,
sbi->s_snapshot_cno);
up_read(&nilfs->ns_segctor_sem);
if (err < 0) {
if (err == -ENOENT)
err = -EINVAL;
goto failed_sbi;
}
if (!err) {
printk(KERN_ERR
"NILFS: The specified checkpoint is "
"not a snapshot "
"(checkpoint number=%llu).\n",
(unsigned long long)sbi->s_snapshot_cno);
err = -EINVAL;
goto failed_sbi;
}
cno = sbi->s_snapshot_cno;
}
}
err = nilfs_attach_checkpoint(sbi, cno);
err = nilfs_attach_checkpoint(sbi, cno, true, &fsroot);
if (err) {
printk(KERN_ERR "NILFS: error loading a checkpoint"
" (checkpoint number=%llu).\n", (unsigned long long)cno);
goto failed_sbi;
printk(KERN_ERR "NILFS: error loading last checkpoint "
"(checkpoint number=%llu).\n", (unsigned long long)cno);
goto failed_unload;
}
if (!(sb->s_flags & MS_RDONLY)) {
err = nilfs_attach_segment_constructor(sbi);
err = nilfs_attach_segment_constructor(sbi, fsroot);
if (err)
goto failed_checkpoint;
}
root = nilfs_iget(sb, NILFS_ROOT_INO);
if (IS_ERR(root)) {
printk(KERN_ERR "NILFS: get root inode failed\n");
err = PTR_ERR(root);
err = nilfs_get_root_dentry(sb, fsroot, &sb->s_root);
if (err)
goto failed_segctor;
}
if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
iput(root);
printk(KERN_ERR "NILFS: corrupt root inode.\n");
err = -EINVAL;
goto failed_segctor;
}
sb->s_root = d_alloc_root(root);
if (!sb->s_root) {
iput(root);
printk(KERN_ERR "NILFS: get root dentry failed\n");
err = -ENOMEM;
goto failed_segctor;
}
nilfs_put_root(fsroot);
if (!(sb->s_flags & MS_RDONLY)) {
down_write(&nilfs->ns_sem);
nilfs_setup_super(sbi);
nilfs_setup_super(sbi, true);
up_write(&nilfs->ns_sem);
}
down_write(&nilfs->ns_super_sem);
if (!nilfs_test_opt(sbi, SNAPSHOT))
nilfs->ns_current = sbi;
up_write(&nilfs->ns_super_sem);
return 0;
failed_segctor:
nilfs_detach_segment_constructor(sbi);
failed_checkpoint:
nilfs_detach_checkpoint(sbi);
nilfs_put_root(fsroot);
failed_unload:
iput(nilfs->ns_sufile);
iput(nilfs->ns_cpfile);
iput(nilfs->ns_dat);
failed_nilfs:
destroy_nilfs(nilfs);
failed_sbi:
put_nilfs(nilfs);
sb->s_fs_info = NULL;
nilfs_put_sbinfo(sbi);
kfree(sbi);
return err;
}
@ -934,13 +1003,10 @@ static int nilfs_remount(struct super_block *sb, int *flags, char *data)
struct the_nilfs *nilfs = sbi->s_nilfs;
unsigned long old_sb_flags;
struct nilfs_mount_options old_opts;
int was_snapshot, err;
int err;
down_write(&nilfs->ns_super_sem);
old_sb_flags = sb->s_flags;
old_opts.mount_opt = sbi->s_mount_opt;
old_opts.snapshot_cno = sbi->s_snapshot_cno;
was_snapshot = nilfs_test_opt(sbi, SNAPSHOT);
if (!parse_options(data, sb, 1)) {
err = -EINVAL;
@ -949,11 +1015,6 @@ static int nilfs_remount(struct super_block *sb, int *flags, char *data)
sb->s_flags = (sb->s_flags & ~MS_POSIXACL);
err = -EINVAL;
if (was_snapshot && !(*flags & MS_RDONLY)) {
printk(KERN_ERR "NILFS (device %s): cannot remount snapshot "
"read/write.\n", sb->s_id);
goto restore_opts;
}
if (!nilfs_valid_fs(nilfs)) {
printk(KERN_WARNING "NILFS (device %s): couldn't "
@ -978,6 +1039,7 @@ static int nilfs_remount(struct super_block *sb, int *flags, char *data)
up_write(&nilfs->ns_sem);
} else {
__u64 features;
struct nilfs_root *root;
/*
* Mounting a RDONLY partition read-write, so reread and
@ -999,23 +1061,21 @@ static int nilfs_remount(struct super_block *sb, int *flags, char *data)
sb->s_flags &= ~MS_RDONLY;
err = nilfs_attach_segment_constructor(sbi);
root = NILFS_I(sb->s_root->d_inode)->i_root;
err = nilfs_attach_segment_constructor(sbi, root);
if (err)
goto restore_opts;
down_write(&nilfs->ns_sem);
nilfs_setup_super(sbi);
nilfs_setup_super(sbi, true);
up_write(&nilfs->ns_sem);
}
out:
up_write(&nilfs->ns_super_sem);
return 0;
restore_opts:
sb->s_flags = old_sb_flags;
sbi->s_mount_opt = old_opts.mount_opt;
sbi->s_snapshot_cno = old_opts.snapshot_cno;
up_write(&nilfs->ns_super_sem);
return err;
}
@ -1035,7 +1095,7 @@ static int nilfs_identify(char *data, struct nilfs_super_data *sd)
{
char *p, *options = data;
substring_t args[MAX_OPT_ARGS];
int option, token;
int token;
int ret = 0;
do {
@ -1043,16 +1103,18 @@ static int nilfs_identify(char *data, struct nilfs_super_data *sd)
if (p != NULL && *p) {
token = match_token(p, tokens, args);
if (token == Opt_snapshot) {
if (!(sd->flags & MS_RDONLY))
if (!(sd->flags & MS_RDONLY)) {
ret++;
else {
ret = match_int(&args[0], &option);
if (!ret) {
if (option > 0)
sd->cno = option;
else
ret++;
}
} else {
sd->cno = simple_strtoull(args[0].from,
NULL, 0);
/*
* No need to see the end pointer;
* match_token() has done syntax
* checking.
*/
if (sd->cno == 0)
ret++;
}
}
if (ret)
@ -1069,18 +1131,14 @@ static int nilfs_identify(char *data, struct nilfs_super_data *sd)
static int nilfs_set_bdev_super(struct super_block *s, void *data)
{
struct nilfs_super_data *sd = data;
s->s_bdev = sd->bdev;
s->s_bdev = data;
s->s_dev = s->s_bdev->bd_dev;
return 0;
}
static int nilfs_test_bdev_super(struct super_block *s, void *data)
{
struct nilfs_super_data *sd = data;
return sd->sbi && s->s_fs_info == (void *)sd->sbi;
return (void *)s->s_bdev == data;
}
static int
@ -1090,8 +1148,8 @@ nilfs_get_sb(struct file_system_type *fs_type, int flags,
struct nilfs_super_data sd;
struct super_block *s;
fmode_t mode = FMODE_READ;
struct the_nilfs *nilfs;
int err, need_to_close = 1;
struct dentry *root_dentry;
int err, s_new = false;
if (!(flags & MS_RDONLY))
mode |= FMODE_WRITE;
@ -1100,12 +1158,6 @@ nilfs_get_sb(struct file_system_type *fs_type, int flags,
if (IS_ERR(sd.bdev))
return PTR_ERR(sd.bdev);
/*
* To get mount instance using sget() vfs-routine, NILFS needs
* much more information than normal filesystems to identify mount
* instance. For snapshot mounts, not only a mount type (ro-mount
* or rw-mount) but also a checkpoint number is required.
*/
sd.cno = 0;
sd.flags = flags;
if (nilfs_identify((char *)data, &sd)) {
@ -1113,93 +1165,86 @@ nilfs_get_sb(struct file_system_type *fs_type, int flags,
goto failed;
}
nilfs = find_or_create_nilfs(sd.bdev);
if (!nilfs) {
err = -ENOMEM;
/*
* once the super is inserted into the list by sget, s_umount
* will protect the lockfs code from trying to start a snapshot
* while we are mounting
*/
mutex_lock(&sd.bdev->bd_fsfreeze_mutex);
if (sd.bdev->bd_fsfreeze_count > 0) {
mutex_unlock(&sd.bdev->bd_fsfreeze_mutex);
err = -EBUSY;
goto failed;
}
mutex_lock(&nilfs->ns_mount_mutex);
if (!sd.cno) {
/*
* Check if an exclusive mount exists or not.
* Snapshot mounts coexist with a current mount
* (i.e. rw-mount or ro-mount), whereas rw-mount and
* ro-mount are mutually exclusive.
*/
down_read(&nilfs->ns_super_sem);
if (nilfs->ns_current &&
((nilfs->ns_current->s_super->s_flags ^ flags)
& MS_RDONLY)) {
up_read(&nilfs->ns_super_sem);
err = -EBUSY;
goto failed_unlock;
}
up_read(&nilfs->ns_super_sem);
}
/*
* Find existing nilfs_sb_info struct
*/
sd.sbi = nilfs_find_sbinfo(nilfs, !(flags & MS_RDONLY), sd.cno);
/*
* Get super block instance holding the nilfs_sb_info struct.
* A new instance is allocated if no existing mount is present or
* existing instance has been unmounted.
*/
s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, &sd);
if (sd.sbi)
nilfs_put_sbinfo(sd.sbi);
s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, sd.bdev);
mutex_unlock(&sd.bdev->bd_fsfreeze_mutex);
if (IS_ERR(s)) {
err = PTR_ERR(s);
goto failed_unlock;
goto failed;
}
if (!s->s_root) {
char b[BDEVNAME_SIZE];
s_new = true;
/* New superblock instance created */
s->s_flags = flags;
s->s_mode = mode;
strlcpy(s->s_id, bdevname(sd.bdev, b), sizeof(s->s_id));
sb_set_blocksize(s, block_size(sd.bdev));
err = nilfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0,
nilfs);
err = nilfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0);
if (err)
goto cancel_new;
goto failed_super;
s->s_flags |= MS_ACTIVE;
need_to_close = 0;
} else if (!sd.cno) {
int busy = false;
if (nilfs_tree_was_touched(s->s_root)) {
busy = nilfs_try_to_shrink_tree(s->s_root);
if (busy && (flags ^ s->s_flags) & MS_RDONLY) {
printk(KERN_ERR "NILFS: the device already "
"has a %s mount.\n",
(s->s_flags & MS_RDONLY) ?
"read-only" : "read/write");
err = -EBUSY;
goto failed_super;
}
}
if (!busy) {
/*
* Try remount to setup mount states if the current
* tree is not mounted and only snapshots use this sb.
*/
err = nilfs_remount(s, &flags, data);
if (err)
goto failed_super;
}
}
mutex_unlock(&nilfs->ns_mount_mutex);
put_nilfs(nilfs);
if (need_to_close)
if (sd.cno) {
err = nilfs_attach_snapshot(s, sd.cno, &root_dentry);
if (err)
goto failed_super;
} else {
root_dentry = dget(s->s_root);
}
if (!s_new)
close_bdev_exclusive(sd.bdev, mode);
simple_set_mnt(mnt, s);
mnt->mnt_sb = s;
mnt->mnt_root = root_dentry;
return 0;
failed_unlock:
mutex_unlock(&nilfs->ns_mount_mutex);
put_nilfs(nilfs);
failed:
close_bdev_exclusive(sd.bdev, mode);
return err;
cancel_new:
/* Abandoning the newly allocated superblock */
mutex_unlock(&nilfs->ns_mount_mutex);
put_nilfs(nilfs);
failed_super:
deactivate_locked_super(s);
/*
* deactivate_locked_super() invokes close_bdev_exclusive().
* We must finish all post-cleaning before this call;
* put_nilfs() needs the block device.
*/
failed:
if (!s_new)
close_bdev_exclusive(sd.bdev, mode);
return err;
}

351
fs/nilfs2/the_nilfs.c
View file

@ -35,9 +35,6 @@
#include "segbuf.h"
static LIST_HEAD(nilfs_objects);
static DEFINE_SPINLOCK(nilfs_lock);
static int nilfs_valid_sb(struct nilfs_super_block *sbp);
void nilfs_set_last_segment(struct the_nilfs *nilfs,
@ -61,16 +58,13 @@ void nilfs_set_last_segment(struct the_nilfs *nilfs,
}
/**
* alloc_nilfs - allocate the_nilfs structure
* alloc_nilfs - allocate a nilfs object
* @bdev: block device to which the_nilfs is related
*
* alloc_nilfs() allocates memory for the_nilfs and
* initializes its reference count and locks.
*
* Return Value: On success, pointer to the_nilfs is returned.
* On error, NULL is returned.
*/
static struct the_nilfs *alloc_nilfs(struct block_device *bdev)
struct the_nilfs *alloc_nilfs(struct block_device *bdev)
{
struct the_nilfs *nilfs;
@ -79,103 +73,38 @@ static struct the_nilfs *alloc_nilfs(struct block_device *bdev)
return NULL;
nilfs->ns_bdev = bdev;
atomic_set(&nilfs->ns_count, 1);
atomic_set(&nilfs->ns_ndirtyblks, 0);
init_rwsem(&nilfs->ns_sem);
init_rwsem(&nilfs->ns_super_sem);
mutex_init(&nilfs->ns_mount_mutex);
init_rwsem(&nilfs->ns_writer_sem);
INIT_LIST_HEAD(&nilfs->ns_list);
INIT_LIST_HEAD(&nilfs->ns_supers);
INIT_LIST_HEAD(&nilfs->ns_gc_inodes);
spin_lock_init(&nilfs->ns_last_segment_lock);
nilfs->ns_gc_inodes_h = NULL;
nilfs->ns_cptree = RB_ROOT;
spin_lock_init(&nilfs->ns_cptree_lock);
init_rwsem(&nilfs->ns_segctor_sem);
return nilfs;
}
/**
* find_or_create_nilfs - find or create nilfs object
* @bdev: block device to which the_nilfs is related
*
* find_nilfs() looks up an existent nilfs object created on the
* device and gets the reference count of the object. If no nilfs object
* is found on the device, a new nilfs object is allocated.
*
* Return Value: On success, pointer to the nilfs object is returned.
* On error, NULL is returned.
* destroy_nilfs - destroy nilfs object
* @nilfs: nilfs object to be released
*/
struct the_nilfs *find_or_create_nilfs(struct block_device *bdev)
void destroy_nilfs(struct the_nilfs *nilfs)
{
struct the_nilfs *nilfs, *new = NULL;
retry:
spin_lock(&nilfs_lock);
list_for_each_entry(nilfs, &nilfs_objects, ns_list) {
if (nilfs->ns_bdev == bdev) {
get_nilfs(nilfs);
spin_unlock(&nilfs_lock);
if (new)
put_nilfs(new);
return nilfs; /* existing object */
}
}
if (new) {
list_add_tail(&new->ns_list, &nilfs_objects);
spin_unlock(&nilfs_lock);
return new; /* new object */
}
spin_unlock(&nilfs_lock);
new = alloc_nilfs(bdev);
if (new)
goto retry;
return NULL; /* insufficient memory */
}
/**
* put_nilfs - release a reference to the_nilfs
* @nilfs: the_nilfs structure to be released
*
* put_nilfs() decrements a reference counter of the_nilfs.
* If the reference count reaches zero, the_nilfs is freed.
*/
void put_nilfs(struct the_nilfs *nilfs)
{
spin_lock(&nilfs_lock);
if (!atomic_dec_and_test(&nilfs->ns_count)) {
spin_unlock(&nilfs_lock);
return;
}
list_del_init(&nilfs->ns_list);
spin_unlock(&nilfs_lock);
/*
* Increment of ns_count never occurs below because the caller
* of get_nilfs() holds at least one reference to the_nilfs.
* Thus its exclusion control is not required here.
*/
might_sleep();
if (nilfs_loaded(nilfs)) {
nilfs_mdt_destroy(nilfs->ns_sufile);
nilfs_mdt_destroy(nilfs->ns_cpfile);
nilfs_mdt_destroy(nilfs->ns_dat);
nilfs_mdt_destroy(nilfs->ns_gc_dat);
}
if (nilfs_init(nilfs)) {
nilfs_destroy_gccache(nilfs);
brelse(nilfs->ns_sbh[0]);
brelse(nilfs->ns_sbh[1]);
}
kfree(nilfs);
}
static int nilfs_load_super_root(struct the_nilfs *nilfs, sector_t sr_block)
static int nilfs_load_super_root(struct the_nilfs *nilfs,
struct super_block *sb, sector_t sr_block)
{
struct buffer_head *bh_sr;
struct nilfs_super_root *raw_sr;
struct nilfs_super_block **sbp = nilfs->ns_sbp;
struct nilfs_inode *rawi;
unsigned dat_entry_size, segment_usage_size, checkpoint_size;
unsigned inode_size;
int err;
@ -192,40 +121,22 @@ static int nilfs_load_super_root(struct the_nilfs *nilfs, sector_t sr_block)
inode_size = nilfs->ns_inode_size;
err = -ENOMEM;
nilfs->ns_dat = nilfs_dat_new(nilfs, dat_entry_size);
if (unlikely(!nilfs->ns_dat))
rawi = (void *)bh_sr->b_data + NILFS_SR_DAT_OFFSET(inode_size);
err = nilfs_dat_read(sb, dat_entry_size, rawi, &nilfs->ns_dat);
if (err)
goto failed;
nilfs->ns_gc_dat = nilfs_dat_new(nilfs, dat_entry_size);
if (unlikely(!nilfs->ns_gc_dat))
rawi = (void *)bh_sr->b_data + NILFS_SR_CPFILE_OFFSET(inode_size);
err = nilfs_cpfile_read(sb, checkpoint_size, rawi, &nilfs->ns_cpfile);
if (err)
goto failed_dat;
nilfs->ns_cpfile = nilfs_cpfile_new(nilfs, checkpoint_size);
if (unlikely(!nilfs->ns_cpfile))
goto failed_gc_dat;
nilfs->ns_sufile = nilfs_sufile_new(nilfs, segment_usage_size);
if (unlikely(!nilfs->ns_sufile))
rawi = (void *)bh_sr->b_data + NILFS_SR_SUFILE_OFFSET(inode_size);
err = nilfs_sufile_read(sb, segment_usage_size, rawi,
&nilfs->ns_sufile);
if (err)
goto failed_cpfile;
nilfs_mdt_set_shadow(nilfs->ns_dat, nilfs->ns_gc_dat);
err = nilfs_dat_read(nilfs->ns_dat, (void *)bh_sr->b_data +
NILFS_SR_DAT_OFFSET(inode_size));
if (unlikely(err))
goto failed_sufile;
err = nilfs_cpfile_read(nilfs->ns_cpfile, (void *)bh_sr->b_data +
NILFS_SR_CPFILE_OFFSET(inode_size));
if (unlikely(err))
goto failed_sufile;
err = nilfs_sufile_read(nilfs->ns_sufile, (void *)bh_sr->b_data +
NILFS_SR_SUFILE_OFFSET(inode_size));
if (unlikely(err))
goto failed_sufile;
raw_sr = (struct nilfs_super_root *)bh_sr->b_data;
nilfs->ns_nongc_ctime = le64_to_cpu(raw_sr->sr_nongc_ctime);
@ -233,17 +144,11 @@ static int nilfs_load_super_root(struct the_nilfs *nilfs, sector_t sr_block)
brelse(bh_sr);
return err;
failed_sufile:
nilfs_mdt_destroy(nilfs->ns_sufile);
failed_cpfile:
nilfs_mdt_destroy(nilfs->ns_cpfile);
failed_gc_dat:
nilfs_mdt_destroy(nilfs->ns_gc_dat);
iput(nilfs->ns_cpfile);
failed_dat:
nilfs_mdt_destroy(nilfs->ns_dat);
iput(nilfs->ns_dat);
goto failed;
}
@ -306,15 +211,6 @@ int load_nilfs(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi)
int valid_fs = nilfs_valid_fs(nilfs);
int err;
if (nilfs_loaded(nilfs)) {
if (valid_fs ||
((s_flags & MS_RDONLY) && nilfs_test_opt(sbi, NORECOVERY)))
return 0;
printk(KERN_ERR "NILFS: the filesystem is in an incomplete "
"recovery state.\n");
return -EINVAL;
}
if (!valid_fs) {
printk(KERN_WARNING "NILFS warning: mounting unchecked fs\n");
if (s_flags & MS_RDONLY) {
@ -375,7 +271,7 @@ int load_nilfs(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi)
goto scan_error;
}
err = nilfs_load_super_root(nilfs, ri.ri_super_root);
err = nilfs_load_super_root(nilfs, sbi->s_super, ri.ri_super_root);
if (unlikely(err)) {
printk(KERN_ERR "NILFS: error loading super root.\n");
goto failed;
@ -443,10 +339,9 @@ int load_nilfs(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi)
goto failed;
failed_unload:
nilfs_mdt_destroy(nilfs->ns_cpfile);
nilfs_mdt_destroy(nilfs->ns_sufile);
nilfs_mdt_destroy(nilfs->ns_dat);
nilfs_mdt_destroy(nilfs->ns_gc_dat);
iput(nilfs->ns_cpfile);
iput(nilfs->ns_sufile);
iput(nilfs->ns_dat);
failed:
nilfs_clear_recovery_info(&ri);
@ -468,8 +363,8 @@ static unsigned long long nilfs_max_size(unsigned int blkbits)
static int nilfs_store_disk_layout(struct the_nilfs *nilfs,
struct nilfs_super_block *sbp)
{
if (le32_to_cpu(sbp->s_rev_level) != NILFS_CURRENT_REV) {
printk(KERN_ERR "NILFS: revision mismatch "
if (le32_to_cpu(sbp->s_rev_level) < NILFS_MIN_SUPP_REV) {
printk(KERN_ERR "NILFS: unsupported revision "
"(superblock rev.=%d.%d, current rev.=%d.%d). "
"Please check the version of mkfs.nilfs.\n",
le32_to_cpu(sbp->s_rev_level),
@ -631,12 +526,7 @@ static int nilfs_load_super_block(struct the_nilfs *nilfs,
*
* init_nilfs() performs common initialization per block device (e.g.
* reading the super block, getting disk layout information, initializing
* shared fields in the_nilfs). It takes on some portion of the jobs
* typically done by a fill_super() routine. This division arises from
* the nature that multiple NILFS instances may be simultaneously
* mounted on a device.
* For multiple mounts on the same device, only the first mount
* invokes these tasks.
* shared fields in the_nilfs).
*
* Return Value: On success, 0 is returned. On error, a negative error
* code is returned.
@ -645,32 +535,10 @@ int init_nilfs(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi, char *data)
{
struct super_block *sb = sbi->s_super;
struct nilfs_super_block *sbp;
struct backing_dev_info *bdi;
int blocksize;
int err;
down_write(&nilfs->ns_sem);
if (nilfs_init(nilfs)) {
/* Load values from existing the_nilfs */
sbp = nilfs->ns_sbp[0];
err = nilfs_store_magic_and_option(sb, sbp, data);
if (err)
goto out;
err = nilfs_check_feature_compatibility(sb, sbp);
if (err)
goto out;
blocksize = BLOCK_SIZE << le32_to_cpu(sbp->s_log_block_size);
if (sb->s_blocksize != blocksize &&
!sb_set_blocksize(sb, blocksize)) {
printk(KERN_ERR "NILFS: blocksize %d unfit to device\n",
blocksize);
err = -EINVAL;
}
sb->s_maxbytes = nilfs_max_size(sb->s_blocksize_bits);
goto out;
}
blocksize = sb_min_blocksize(sb, NILFS_MIN_BLOCK_SIZE);
if (!blocksize) {
@ -729,18 +597,10 @@ int init_nilfs(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi, char *data)
nilfs->ns_mount_state = le16_to_cpu(sbp->s_state);
bdi = nilfs->ns_bdev->bd_inode->i_mapping->backing_dev_info;
nilfs->ns_bdi = bdi ? : &default_backing_dev_info;
err = nilfs_store_log_cursor(nilfs, sbp);
if (err)
goto failed_sbh;
/* Initialize gcinode cache */
err = nilfs_init_gccache(nilfs);
if (err)
goto failed_sbh;
set_nilfs_init(nilfs);
err = 0;
out:
@ -812,79 +672,92 @@ int nilfs_near_disk_full(struct the_nilfs *nilfs)
return ncleansegs <= nilfs->ns_nrsvsegs + nincsegs;
}
/**
* nilfs_find_sbinfo - find existing nilfs_sb_info structure
* @nilfs: nilfs object
* @rw_mount: mount type (non-zero value for read/write mount)
* @cno: checkpoint number (zero for read-only mount)
*
* nilfs_find_sbinfo() returns the nilfs_sb_info structure which
* @rw_mount and @cno (in case of snapshots) matched. If no instance
* was found, NULL is returned. Although the super block instance can
* be unmounted after this function returns, the nilfs_sb_info struct
* is kept on memory until nilfs_put_sbinfo() is called.
*/
struct nilfs_sb_info *nilfs_find_sbinfo(struct the_nilfs *nilfs,
int rw_mount, __u64 cno)
struct nilfs_root *nilfs_lookup_root(struct the_nilfs *nilfs, __u64 cno)
{
struct nilfs_sb_info *sbi;
struct rb_node *n;
struct nilfs_root *root;
down_read(&nilfs->ns_super_sem);
/*
* The SNAPSHOT flag and sb->s_flags are supposed to be
* protected with nilfs->ns_super_sem.
*/
sbi = nilfs->ns_current;
if (rw_mount) {
if (sbi && !(sbi->s_super->s_flags & MS_RDONLY))
goto found; /* read/write mount */
else
goto out;
} else if (cno == 0) {
if (sbi && (sbi->s_super->s_flags & MS_RDONLY))
goto found; /* read-only mount */
else
goto out;
}
spin_lock(&nilfs->ns_cptree_lock);
n = nilfs->ns_cptree.rb_node;
while (n) {
root = rb_entry(n, struct nilfs_root, rb_node);
list_for_each_entry(sbi, &nilfs->ns_supers, s_list) {
if (nilfs_test_opt(sbi, SNAPSHOT) &&
sbi->s_snapshot_cno == cno)
goto found; /* snapshot mount */
}
out:
up_read(&nilfs->ns_super_sem);
return NULL;
found:
atomic_inc(&sbi->s_count);
up_read(&nilfs->ns_super_sem);
return sbi;
}
int nilfs_checkpoint_is_mounted(struct the_nilfs *nilfs, __u64 cno,
int snapshot_mount)
{
struct nilfs_sb_info *sbi;
int ret = 0;
down_read(&nilfs->ns_super_sem);
if (cno == 0 || cno > nilfs->ns_cno)
goto out_unlock;
list_for_each_entry(sbi, &nilfs->ns_supers, s_list) {
if (sbi->s_snapshot_cno == cno &&
(!snapshot_mount || nilfs_test_opt(sbi, SNAPSHOT))) {
/* exclude read-only mounts */
ret++;
break;
if (cno < root->cno) {
n = n->rb_left;
} else if (cno > root->cno) {
n = n->rb_right;
} else {
atomic_inc(&root->count);
spin_unlock(&nilfs->ns_cptree_lock);
return root;
}
}
/* for protecting recent checkpoints */
if (cno >= nilfs_last_cno(nilfs))
ret++;
spin_unlock(&nilfs->ns_cptree_lock);
out_unlock:
up_read(&nilfs->ns_super_sem);
return ret;
return NULL;
}
struct nilfs_root *
nilfs_find_or_create_root(struct the_nilfs *nilfs, __u64 cno)
{
struct rb_node **p, *parent;
struct nilfs_root *root, *new;
root = nilfs_lookup_root(nilfs, cno);
if (root)
return root;
new = kmalloc(sizeof(*root), GFP_KERNEL);
if (!new)
return NULL;
spin_lock(&nilfs->ns_cptree_lock);
p = &nilfs->ns_cptree.rb_node;
parent = NULL;
while (*p) {
parent = *p;
root = rb_entry(parent, struct nilfs_root, rb_node);
if (cno < root->cno) {
p = &(*p)->rb_left;
} else if (cno > root->cno) {
p = &(*p)->rb_right;
} else {
atomic_inc(&root->count);
spin_unlock(&nilfs->ns_cptree_lock);
kfree(new);
return root;
}
}
new->cno = cno;
new->ifile = NULL;
new->nilfs = nilfs;
atomic_set(&new->count, 1);
atomic_set(&new->inodes_count, 0);
atomic_set(&new->blocks_count, 0);
rb_link_node(&new->rb_node, parent, p);
rb_insert_color(&new->rb_node, &nilfs->ns_cptree);
spin_unlock(&nilfs->ns_cptree_lock);
return new;
}
void nilfs_put_root(struct nilfs_root *root)
{
if (atomic_dec_and_test(&root->count)) {
struct the_nilfs *nilfs = root->nilfs;
spin_lock(&nilfs->ns_cptree_lock);
rb_erase(&root->rb_node, &nilfs->ns_cptree);
spin_unlock(&nilfs->ns_cptree_lock);
if (root->ifile)
iput(root->ifile);
kfree(root);
}
}

101
fs/nilfs2/the_nilfs.h
View file

@ -26,6 +26,7 @@
#include <linux/types.h>
#include <linux/buffer_head.h>
#include <linux/rbtree.h>
#include <linux/fs.h>
#include <linux/blkdev.h>
#include <linux/backing-dev.h>
@ -45,22 +46,13 @@ enum {
/**
* struct the_nilfs - struct to supervise multiple nilfs mount points
* @ns_flags: flags
* @ns_count: reference count
* @ns_list: list head for nilfs_list
* @ns_bdev: block device
* @ns_bdi: backing dev info
* @ns_writer: back pointer to writable nilfs_sb_info
* @ns_sem: semaphore for shared states
* @ns_super_sem: semaphore for global operations across super block instances
* @ns_mount_mutex: mutex protecting mount process of nilfs
* @ns_writer_sem: semaphore protecting ns_writer attach/detach
* @ns_current: back pointer to current mount
* @ns_sbh: buffer heads of on-disk super blocks
* @ns_sbp: pointers to super block data
* @ns_sbwtime: previous write time of super block
* @ns_sbwcount: write count of super block
* @ns_sbsize: size of valid data in super block
* @ns_supers: list of nilfs super block structs
* @ns_seg_seq: segment sequence counter
* @ns_segnum: index number of the latest full segment.
* @ns_nextnum: index number of the full segment index to be used next
@ -79,9 +71,9 @@ enum {
* @ns_dat: DAT file inode
* @ns_cpfile: checkpoint file inode
* @ns_sufile: segusage file inode
* @ns_gc_dat: shadow inode of the DAT file inode for GC
* @ns_cptree: rb-tree of all mounted checkpoints (nilfs_root)
* @ns_cptree_lock: lock protecting @ns_cptree
* @ns_gc_inodes: dummy inodes to keep live blocks
* @ns_gc_inodes_h: hash list to keep dummy inode holding live blocks
* @ns_blocksize_bits: bit length of block size
* @ns_blocksize: block size
* @ns_nsegments: number of segments in filesystem
@ -95,22 +87,9 @@ enum {
*/
struct the_nilfs {
unsigned long ns_flags;
atomic_t ns_count;
struct list_head ns_list;
struct block_device *ns_bdev;
struct backing_dev_info *ns_bdi;
struct nilfs_sb_info *ns_writer;
struct rw_semaphore ns_sem;
struct rw_semaphore ns_super_sem;
struct mutex ns_mount_mutex;
struct rw_semaphore ns_writer_sem;
/*
* components protected by ns_super_sem
*/
struct nilfs_sb_info *ns_current;
struct list_head ns_supers;
/*
* used for
@ -163,11 +142,13 @@ struct the_nilfs {
struct inode *ns_dat;
struct inode *ns_cpfile;
struct inode *ns_sufile;
struct inode *ns_gc_dat;
/* GC inode list and hash table head */
/* Checkpoint tree */
struct rb_root ns_cptree;
spinlock_t ns_cptree_lock;
/* GC inode list */
struct list_head ns_gc_inodes;
struct hlist_head *ns_gc_inodes_h;
/* Disk layout information (static) */
unsigned int ns_blocksize_bits;
@ -182,9 +163,6 @@ struct the_nilfs {
u32 ns_crc_seed;
};
#define NILFS_GCINODE_HASH_BITS 8
#define NILFS_GCINODE_HASH_SIZE (1<<NILFS_GCINODE_HASH_BITS)
#define THE_NILFS_FNS(bit, name) \
static inline void set_nilfs_##name(struct the_nilfs *nilfs) \
{ \
@ -205,6 +183,32 @@ THE_NILFS_FNS(DISCONTINUED, discontinued)
THE_NILFS_FNS(GC_RUNNING, gc_running)
THE_NILFS_FNS(SB_DIRTY, sb_dirty)
/**
* struct nilfs_root - nilfs root object
* @cno: checkpoint number
* @rb_node: red-black tree node
* @count: refcount of this structure
* @nilfs: nilfs object
* @ifile: inode file
* @root: root inode
* @inodes_count: number of inodes
* @blocks_count: number of blocks (Reserved)
*/
struct nilfs_root {
__u64 cno;
struct rb_node rb_node;
atomic_t count;
struct the_nilfs *nilfs;
struct inode *ifile;
atomic_t inodes_count;
atomic_t blocks_count;
};
/* Special checkpoint number */
#define NILFS_CPTREE_CURRENT_CNO 0
/* Minimum interval of periodical update of superblocks (in seconds) */
#define NILFS_SB_FREQ 10
@ -221,46 +225,25 @@ static inline int nilfs_sb_will_flip(struct the_nilfs *nilfs)
}
void nilfs_set_last_segment(struct the_nilfs *, sector_t, u64, __u64);
struct the_nilfs *find_or_create_nilfs(struct block_device *);
void put_nilfs(struct the_nilfs *);
struct the_nilfs *alloc_nilfs(struct block_device *bdev);
void destroy_nilfs(struct the_nilfs *nilfs);
int init_nilfs(struct the_nilfs *, struct nilfs_sb_info *, char *);
int load_nilfs(struct the_nilfs *, struct nilfs_sb_info *);
int nilfs_discard_segments(struct the_nilfs *, __u64 *, size_t);
int nilfs_count_free_blocks(struct the_nilfs *, sector_t *);
struct nilfs_root *nilfs_lookup_root(struct the_nilfs *nilfs, __u64 cno);
struct nilfs_root *nilfs_find_or_create_root(struct the_nilfs *nilfs,
__u64 cno);
void nilfs_put_root(struct nilfs_root *root);
struct nilfs_sb_info *nilfs_find_sbinfo(struct the_nilfs *, int, __u64);
int nilfs_checkpoint_is_mounted(struct the_nilfs *, __u64, int);
int nilfs_near_disk_full(struct the_nilfs *);
void nilfs_fall_back_super_block(struct the_nilfs *);
void nilfs_swap_super_block(struct the_nilfs *);
static inline void get_nilfs(struct the_nilfs *nilfs)
static inline void nilfs_get_root(struct nilfs_root *root)
{
/* Caller must have at least one reference of the_nilfs. */
atomic_inc(&nilfs->ns_count);
}
static inline void
nilfs_attach_writer(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi)
{
down_write(&nilfs->ns_writer_sem);
nilfs->ns_writer = sbi;
up_write(&nilfs->ns_writer_sem);
}
static inline void
nilfs_detach_writer(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi)
{
down_write(&nilfs->ns_writer_sem);
if (sbi == nilfs->ns_writer)
nilfs->ns_writer = NULL;
up_write(&nilfs->ns_writer_sem);
}
static inline void nilfs_put_sbinfo(struct nilfs_sb_info *sbi)
{
if (atomic_dec_and_test(&sbi->s_count))
kfree(sbi);
atomic_inc(&root->count);
}
static inline int nilfs_valid_fs(struct the_nilfs *nilfs)

13
include/linux/exportfs.h
View file

@ -67,6 +67,19 @@ enum fid_type {
* 32 bit parent block number, 32 bit parent generation number
*/
FILEID_UDF_WITH_PARENT = 0x52,
/*
* 64 bit checkpoint number, 64 bit inode number,
* 32 bit generation number.
*/
FILEID_NILFS_WITHOUT_PARENT = 0x61,
/*
* 64 bit checkpoint number, 64 bit inode number,
* 32 bit generation number, 32 bit parent generation.
* 64 bit parent inode number.
*/
FILEID_NILFS_WITH_PARENT = 0x62,
};
struct fid {

18
include/linux/nilfs2_fs.h
View file

@ -4,16 +4,16 @@
* Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
@ -147,7 +147,6 @@ struct nilfs_super_root {
#define NILFS_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */
#define NILFS_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */
#define NILFS_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */
#define NILFS_MOUNT_SNAPSHOT 0x0080 /* Snapshot flag */
#define NILFS_MOUNT_BARRIER 0x1000 /* Use block barriers */
#define NILFS_MOUNT_STRICT_ORDER 0x2000 /* Apply strict in-order
semantics also for data */
@ -229,6 +228,7 @@ struct nilfs_super_block {
*/
#define NILFS_CURRENT_REV 2 /* current major revision */
#define NILFS_MINOR_REV 0 /* minor revision */
#define NILFS_MIN_SUPP_REV 2 /* minimum supported revision */
/*
* Feature set definitions
@ -269,6 +269,14 @@ struct nilfs_super_block {
#define NILFS_MIN_NRSVSEGS 8 /* Minimum number of reserved
segments */
/*
* We call DAT, cpfile, and sufile root metadata files. Inodes of
* these files are written in super root block instead of ifile, and
* garbage collector doesn't keep any past versions of these files.
*/
#define NILFS_ROOT_METADATA_FILE(ino) \
((ino) >= NILFS_DAT_INO && (ino) <= NILFS_SUFILE_INO)
/*
* bytes offset of secondary super block
*/