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xfs: pnfs block layout support for 3.20-rc1

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This update contains the implementation of the PNFS server export
 methods that enable use of XFS filesystems as a block layout target.
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Merge tag 'xfs-pnfs-for-linus-3.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/dgc/linux-xfs

Pull xfs pnfs block layout support from Dave Chinner:
 "This contains the changes to XFS needed to support the PNFS block
  layout server that you pulled in through Bruce's NFS server tree
  merge.

  I originally thought that I'd need to merge changes into the NFS
  server side, but Bruce had already picked them up and so this is
  purely changes to the fs/xfs/ codebase.

  Summary:

  This update contains the implementation of the PNFS server export
  methods that enable use of XFS filesystems as a block layout target"

* tag 'xfs-pnfs-for-linus-3.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/dgc/linux-xfs:
  xfs: recall pNFS layouts on conflicting access
  xfs: implement pNFS export operations
This commit is contained in:
Linus Torvalds 2015-02-21 14:09:38 -08:00
commit 93aaa830fc
10 changed files with 393 additions and 8 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
fs/xfs/Makefile
View file

@ -121,3 +121,4 @@ xfs-$(CONFIG_XFS_POSIX_ACL) += xfs_acl.o
xfs-$(CONFIG_PROC_FS) += xfs_stats.o
xfs-$(CONFIG_SYSCTL) += xfs_sysctl.o
xfs-$(CONFIG_COMPAT) += xfs_ioctl32.o
xfs-$(CONFIG_NFSD_PNFS) += xfs_pnfs.o

6
fs/xfs/xfs_export.c
View file

@ -30,6 +30,7 @@
#include "xfs_trace.h"
#include "xfs_icache.h"
#include "xfs_log.h"
#include "xfs_pnfs.h"
/*
* Note that we only accept fileids which are long enough rather than allow
@ -245,4 +246,9 @@ const struct export_operations xfs_export_operations = {
.fh_to_parent = xfs_fs_fh_to_parent,
.get_parent = xfs_fs_get_parent,
.commit_metadata = xfs_fs_nfs_commit_metadata,
#ifdef CONFIG_NFSD_PNFS
.get_uuid = xfs_fs_get_uuid,
.map_blocks = xfs_fs_map_blocks,
.commit_blocks = xfs_fs_commit_blocks,
#endif
};

14
fs/xfs/xfs_file.c
View file

@ -36,6 +36,7 @@
#include "xfs_trace.h"
#include "xfs_log.h"
#include "xfs_icache.h"
#include "xfs_pnfs.h"
#include <linux/aio.h>
#include <linux/dcache.h>
@ -554,6 +555,10 @@ xfs_file_aio_write_checks(
if (error)
return error;
error = xfs_break_layouts(inode, iolock);
if (error)
return error;
/*
* If the offset is beyond the size of the file, we need to zero any
* blocks that fall between the existing EOF and the start of this
@ -822,6 +827,7 @@ xfs_file_fallocate(
struct xfs_inode *ip = XFS_I(inode);
long error;
enum xfs_prealloc_flags flags = 0;
uint iolock = XFS_IOLOCK_EXCL;
loff_t new_size = 0;
if (!S_ISREG(inode->i_mode))
@ -830,7 +836,11 @@ xfs_file_fallocate(
FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_ZERO_RANGE))
return -EOPNOTSUPP;
xfs_ilock(ip, XFS_IOLOCK_EXCL);
xfs_ilock(ip, iolock);
error = xfs_break_layouts(inode, &iolock);
if (error)
goto out_unlock;
if (mode & FALLOC_FL_PUNCH_HOLE) {
error = xfs_free_file_space(ip, offset, len);
if (error)
@ -894,7 +904,7 @@ xfs_file_fallocate(
}
out_unlock:
xfs_iunlock(ip, XFS_IOLOCK_EXCL);
xfs_iunlock(ip, iolock);
return error;
}

6
fs/xfs/xfs_fsops.c
View file

@ -602,6 +602,12 @@ xfs_growfs_data(
if (!mutex_trylock(&mp->m_growlock))
return -EWOULDBLOCK;
error = xfs_growfs_data_private(mp, in);
/*
* Increment the generation unconditionally, the error could be from
* updating the secondary superblocks, in which case the new size
* is live already.
*/
mp->m_generation++;
mutex_unlock(&mp->m_growlock);
return error;
}

9
fs/xfs/xfs_ioctl.c
View file

@ -39,6 +39,7 @@
#include "xfs_icache.h"
#include "xfs_symlink.h"
#include "xfs_trans.h"
#include "xfs_pnfs.h"
#include <linux/capability.h>
#include <linux/dcache.h>
@ -608,6 +609,7 @@ xfs_ioc_space(
{
struct iattr iattr;
enum xfs_prealloc_flags flags = 0;
uint iolock = XFS_IOLOCK_EXCL;
int error;
/*
@ -636,7 +638,10 @@ xfs_ioc_space(
if (error)
return error;
xfs_ilock(ip, XFS_IOLOCK_EXCL);
xfs_ilock(ip, iolock);
error = xfs_break_layouts(inode, &iolock);
if (error)
goto out_unlock;
switch (bf->l_whence) {
case 0: /*SEEK_SET*/
@ -725,7 +730,7 @@ xfs_ioc_space(
error = xfs_update_prealloc_flags(ip, flags);
out_unlock:
xfs_iunlock(ip, XFS_IOLOCK_EXCL);
xfs_iunlock(ip, iolock);
mnt_drop_write_file(filp);
return error;
}

13
fs/xfs/xfs_iops.c
View file

@ -37,6 +37,7 @@
#include "xfs_da_btree.h"
#include "xfs_dir2.h"
#include "xfs_trans_space.h"
#include "xfs_pnfs.h"
#include <linux/capability.h>
#include <linux/xattr.h>
@ -505,7 +506,7 @@ xfs_setattr_mode(
inode->i_mode |= mode & ~S_IFMT;
}
static void
void
xfs_setattr_time(
struct xfs_inode *ip,
struct iattr *iattr)
@ -979,9 +980,13 @@ xfs_vn_setattr(
int error;
if (iattr->ia_valid & ATTR_SIZE) {
xfs_ilock(ip, XFS_IOLOCK_EXCL);
error = xfs_setattr_size(ip, iattr);
xfs_iunlock(ip, XFS_IOLOCK_EXCL);
uint iolock = XFS_IOLOCK_EXCL;
xfs_ilock(ip, iolock);
error = xfs_break_layouts(dentry->d_inode, &iolock);
if (!error)
error = xfs_setattr_size(ip, iattr);
xfs_iunlock(ip, iolock);
} else {
error = xfs_setattr_nonsize(ip, iattr, 0);
}

1
fs/xfs/xfs_iops.h
View file

@ -32,6 +32,7 @@ extern void xfs_setup_inode(struct xfs_inode *);
*/
#define XFS_ATTR_NOACL 0x01 /* Don't call posix_acl_chmod */
extern void xfs_setattr_time(struct xfs_inode *ip, struct iattr *iattr);
extern int xfs_setattr_nonsize(struct xfs_inode *ip, struct iattr *vap,
int flags);
extern int xfs_setattr_size(struct xfs_inode *ip, struct iattr *vap);

11
fs/xfs/xfs_mount.h
View file

@ -174,6 +174,17 @@ typedef struct xfs_mount {
struct workqueue_struct *m_reclaim_workqueue;
struct workqueue_struct *m_log_workqueue;
struct workqueue_struct *m_eofblocks_workqueue;
/*
* Generation of the filesysyem layout. This is incremented by each
* growfs, and used by the pNFS server to ensure the client updates
* its view of the block device once it gets a layout that might
* reference the newly added blocks. Does not need to be persistent
* as long as we only allow file system size increments, but if we
* ever support shrinks it would have to be persisted in addition
* to various other kinds of pain inflicted on the pNFS server.
*/
__uint32_t m_generation;
} xfs_mount_t;
/*

322
fs/xfs/xfs_pnfs.c Normal file
View file

@ -0,0 +1,322 @@
/*
* Copyright (c) 2014 Christoph Hellwig.
*/
#include "xfs.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_sb.h"
#include "xfs_mount.h"
#include "xfs_inode.h"
#include "xfs_trans.h"
#include "xfs_log.h"
#include "xfs_bmap.h"
#include "xfs_bmap_util.h"
#include "xfs_error.h"
#include "xfs_iomap.h"
#include "xfs_shared.h"
#include "xfs_bit.h"
#include "xfs_pnfs.h"
/*
* Ensure that we do not have any outstanding pNFS layouts that can be used by
* clients to directly read from or write to this inode. This must be called
* before every operation that can remove blocks from the extent map.
* Additionally we call it during the write operation, where aren't concerned
* about exposing unallocated blocks but just want to provide basic
* synchronization between a local writer and pNFS clients. mmap writes would
* also benefit from this sort of synchronization, but due to the tricky locking
* rules in the page fault path we don't bother.
*/
int
xfs_break_layouts(
struct inode *inode,
uint *iolock)
{
struct xfs_inode *ip = XFS_I(inode);
int error;
ASSERT(xfs_isilocked(ip, XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL));
while ((error = break_layout(inode, false) == -EWOULDBLOCK)) {
xfs_iunlock(ip, *iolock);
error = break_layout(inode, true);
*iolock = XFS_IOLOCK_EXCL;
xfs_ilock(ip, *iolock);
}
return error;
}
/*
* Get a unique ID including its location so that the client can identify
* the exported device.
*/
int
xfs_fs_get_uuid(
struct super_block *sb,
u8 *buf,
u32 *len,
u64 *offset)
{
struct xfs_mount *mp = XFS_M(sb);
printk_once(KERN_NOTICE
"XFS (%s): using experimental pNFS feature, use at your own risk!\n",
mp->m_fsname);
if (*len < sizeof(uuid_t))
return -EINVAL;
memcpy(buf, &mp->m_sb.sb_uuid, sizeof(uuid_t));
*len = sizeof(uuid_t);
*offset = offsetof(struct xfs_dsb, sb_uuid);
return 0;
}
static void
xfs_bmbt_to_iomap(
struct xfs_inode *ip,
struct iomap *iomap,
struct xfs_bmbt_irec *imap)
{
struct xfs_mount *mp = ip->i_mount;
if (imap->br_startblock == HOLESTARTBLOCK) {
iomap->blkno = IOMAP_NULL_BLOCK;
iomap->type = IOMAP_HOLE;
} else if (imap->br_startblock == DELAYSTARTBLOCK) {
iomap->blkno = IOMAP_NULL_BLOCK;
iomap->type = IOMAP_DELALLOC;
} else {
iomap->blkno =
XFS_FSB_TO_DADDR(ip->i_mount, imap->br_startblock);
if (imap->br_state == XFS_EXT_UNWRITTEN)
iomap->type = IOMAP_UNWRITTEN;
else
iomap->type = IOMAP_MAPPED;
}
iomap->offset = XFS_FSB_TO_B(mp, imap->br_startoff);
iomap->length = XFS_FSB_TO_B(mp, imap->br_blockcount);
}
/*
* Get a layout for the pNFS client.
*/
int
xfs_fs_map_blocks(
struct inode *inode,
loff_t offset,
u64 length,
struct iomap *iomap,
bool write,
u32 *device_generation)
{
struct xfs_inode *ip = XFS_I(inode);
struct xfs_mount *mp = ip->i_mount;
struct xfs_bmbt_irec imap;
xfs_fileoff_t offset_fsb, end_fsb;
loff_t limit;
int bmapi_flags = XFS_BMAPI_ENTIRE;
int nimaps = 1;
uint lock_flags;
int error = 0;
if (XFS_FORCED_SHUTDOWN(mp))
return -EIO;
/*
* We can't export inodes residing on the realtime device. The realtime
* device doesn't have a UUID to identify it, so the client has no way
* to find it.
*/
if (XFS_IS_REALTIME_INODE(ip))
return -ENXIO;
/*
* Lock out any other I/O before we flush and invalidate the pagecache,
* and then hand out a layout to the remote system. This is very
* similar to direct I/O, except that the synchronization is much more
* complicated. See the comment near xfs_break_layouts for a detailed
* explanation.
*/
xfs_ilock(ip, XFS_IOLOCK_EXCL);
error = -EINVAL;
limit = mp->m_super->s_maxbytes;
if (!write)
limit = max(limit, round_up(i_size_read(inode),
inode->i_sb->s_blocksize));
if (offset > limit)
goto out_unlock;
if (offset > limit - length)
length = limit - offset;
error = filemap_write_and_wait(inode->i_mapping);
if (error)
goto out_unlock;
error = invalidate_inode_pages2(inode->i_mapping);
if (WARN_ON_ONCE(error))
return error;
end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + length);
offset_fsb = XFS_B_TO_FSBT(mp, offset);
lock_flags = xfs_ilock_data_map_shared(ip);
error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb,
&imap, &nimaps, bmapi_flags);
xfs_iunlock(ip, lock_flags);
if (error)
goto out_unlock;
if (write) {
enum xfs_prealloc_flags flags = 0;
ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
if (!nimaps || imap.br_startblock == HOLESTARTBLOCK) {
error = xfs_iomap_write_direct(ip, offset, length,
&imap, nimaps);
if (error)
goto out_unlock;
/*
* Ensure the next transaction is committed
* synchronously so that the blocks allocated and
* handed out to the client are guaranteed to be
* present even after a server crash.
*/
flags |= XFS_PREALLOC_SET | XFS_PREALLOC_SYNC;
}
error = xfs_update_prealloc_flags(ip, flags);
if (error)
goto out_unlock;
}
xfs_iunlock(ip, XFS_IOLOCK_EXCL);
xfs_bmbt_to_iomap(ip, iomap, &imap);
*device_generation = mp->m_generation;
return error;
out_unlock:
xfs_iunlock(ip, XFS_IOLOCK_EXCL);
return error;
}
/*
* Ensure the size update falls into a valid allocated block.
*/
static int
xfs_pnfs_validate_isize(
struct xfs_inode *ip,
xfs_off_t isize)
{
struct xfs_bmbt_irec imap;
int nimaps = 1;
int error = 0;
xfs_ilock(ip, XFS_ILOCK_SHARED);
error = xfs_bmapi_read(ip, XFS_B_TO_FSBT(ip->i_mount, isize - 1), 1,
&imap, &nimaps, 0);
xfs_iunlock(ip, XFS_ILOCK_SHARED);
if (error)
return error;
if (imap.br_startblock == HOLESTARTBLOCK ||
imap.br_startblock == DELAYSTARTBLOCK ||
imap.br_state == XFS_EXT_UNWRITTEN)
return -EIO;
return 0;
}
/*
* Make sure the blocks described by maps are stable on disk. This includes
* converting any unwritten extents, flushing the disk cache and updating the
* time stamps.
*
* Note that we rely on the caller to always send us a timestamp update so that
* we always commit a transaction here. If that stops being true we will have
* to manually flush the cache here similar to what the fsync code path does
* for datasyncs on files that have no dirty metadata.
*/
int
xfs_fs_commit_blocks(
struct inode *inode,
struct iomap *maps,
int nr_maps,
struct iattr *iattr)
{
struct xfs_inode *ip = XFS_I(inode);
struct xfs_mount *mp = ip->i_mount;
struct xfs_trans *tp;
bool update_isize = false;
int error, i;
loff_t size;
ASSERT(iattr->ia_valid & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME));
xfs_ilock(ip, XFS_IOLOCK_EXCL);
size = i_size_read(inode);
if ((iattr->ia_valid & ATTR_SIZE) && iattr->ia_size > size) {
update_isize = true;
size = iattr->ia_size;
}
for (i = 0; i < nr_maps; i++) {
u64 start, length, end;
start = maps[i].offset;
if (start > size)
continue;
end = start + maps[i].length;
if (end > size)
end = size;
length = end - start;
if (!length)
continue;
/*
* Make sure reads through the pagecache see the new data.
*/
error = invalidate_inode_pages2_range(inode->i_mapping,
start >> PAGE_CACHE_SHIFT,
(end - 1) >> PAGE_CACHE_SHIFT);
WARN_ON_ONCE(error);
error = xfs_iomap_write_unwritten(ip, start, length);
if (error)
goto out_drop_iolock;
}
if (update_isize) {
error = xfs_pnfs_validate_isize(ip, size);
if (error)
goto out_drop_iolock;
}
tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_NOT_SIZE);
error = xfs_trans_reserve(tp, &M_RES(mp)->tr_ichange, 0, 0);
if (error)
goto out_drop_iolock;
xfs_ilock(ip, XFS_ILOCK_EXCL);
xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
xfs_setattr_time(ip, iattr);
if (update_isize) {
i_size_write(inode, iattr->ia_size);
ip->i_d.di_size = iattr->ia_size;
}
xfs_trans_set_sync(tp);
error = xfs_trans_commit(tp, 0);
out_drop_iolock:
xfs_iunlock(ip, XFS_IOLOCK_EXCL);
return error;
}

18
fs/xfs/xfs_pnfs.h Normal file
View file

@ -0,0 +1,18 @@
#ifndef _XFS_PNFS_H
#define _XFS_PNFS_H 1
#ifdef CONFIG_NFSD_PNFS
int xfs_fs_get_uuid(struct super_block *sb, u8 *buf, u32 *len, u64 *offset);
int xfs_fs_map_blocks(struct inode *inode, loff_t offset, u64 length,
struct iomap *iomap, bool write, u32 *device_generation);
int xfs_fs_commit_blocks(struct inode *inode, struct iomap *maps, int nr_maps,
struct iattr *iattr);
int xfs_break_layouts(struct inode *inode, uint *iolock);
#else
static inline int xfs_break_layouts(struct inode *inode, uint *iolock)
{
return 0;
}
#endif /* CONFIG_NFSD_PNFS */
#endif /* _XFS_PNFS_H */