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Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4

Browse source 
* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
  ext4: Patch up how we claim metadata blocks for quota purposes
  ext4: Ensure zeroout blocks have no dirty metadata
  ext4: return correct wbc.nr_to_write in ext4_da_writepages
  ext4: Update documentation to correct the inode_readahead_blks option name
  jbd2: don't use __GFP_NOFAIL in journal_init_common()
  ext4: flush delalloc blocks when space is low
  fs-writeback: Add helper function to start writeback if idle
  ext4: Eliminate potential double free on error path
  ext4: fix unsigned long long printk warning in super.c
  ext4, jbd2: Add barriers for file systems with exernal journals
  ext4: replace BUG() with return -EIO in ext4_ext_get_blocks
  ext4: add module aliases for ext2 and ext3
  ext4: Don't ask about supporting ext2/3 in ext4 if ext4 is not configured
  ext4: remove unused #include <linux/version.h>
This commit is contained in:
Linus Torvalds 2009-12-30 13:25:56 -08:00
commit 1f11abc966
15 changed files with 189 additions and 94 deletions
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2
Documentation/filesystems/ext4.txt
View file

@ -196,7 +196,7 @@ nobarrier This also requires an IO stack which can support
also be used to enable or disable barriers, for
consistency with other ext4 mount options.
inode_readahead=n This tuning parameter controls the maximum
inode_readahead_blks=n This tuning parameter controls the maximum
number of inode table blocks that ext4's inode
table readahead algorithm will pre-read into
the buffer cache. The default value is 32 blocks.

1
fs/ext4/Kconfig
View file

@ -28,6 +28,7 @@ config EXT4_FS
config EXT4_USE_FOR_EXT23
bool "Use ext4 for ext2/ext3 file systems"
depends on EXT4_FS
depends on EXT3_FS=n || EXT2_FS=n
default y
help

1
fs/ext4/block_validity.c
View file

@ -16,7 +16,6 @@
#include <linux/module.h>
#include <linux/swap.h>
#include <linux/pagemap.h>
#include <linux/version.h>
#include <linux/blkdev.h>
#include <linux/mutex.h>
#include "ext4.h"

28
fs/ext4/extents.c
View file

@ -3023,6 +3023,14 @@ static int ext4_convert_unwritten_extents_dio(handle_t *handle,
return err;
}
static void unmap_underlying_metadata_blocks(struct block_device *bdev,
sector_t block, int count)
{
int i;
for (i = 0; i < count; i++)
unmap_underlying_metadata(bdev, block + i);
}
static int
ext4_ext_handle_uninitialized_extents(handle_t *handle, struct inode *inode,
ext4_lblk_t iblock, unsigned int max_blocks,
@ -3098,6 +3106,18 @@ ext4_ext_handle_uninitialized_extents(handle_t *handle, struct inode *inode,
} else
allocated = ret;
set_buffer_new(bh_result);
/*
* if we allocated more blocks than requested
* we need to make sure we unmap the extra block
* allocated. The actual needed block will get
* unmapped later when we find the buffer_head marked
* new.
*/
if (allocated > max_blocks) {
unmap_underlying_metadata_blocks(inode->i_sb->s_bdev,
newblock + max_blocks,
allocated - max_blocks);
}
map_out:
set_buffer_mapped(bh_result);
out1:
@ -3190,7 +3210,13 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
* this situation is possible, though, _during_ tree modification;
* this is why assert can't be put in ext4_ext_find_extent()
*/
BUG_ON(path[depth].p_ext == NULL && depth != 0);
if (path[depth].p_ext == NULL && depth != 0) {
ext4_error(inode->i_sb, __func__, "bad extent address "
"inode: %lu, iblock: %d, depth: %d",
inode->i_ino, iblock, depth);
err = -EIO;
goto out2;
}
eh = path[depth].p_hdr;
ex = path[depth].p_ext;

16
fs/ext4/fsync.c
View file

@ -88,9 +88,21 @@ int ext4_sync_file(struct file *file, struct dentry *dentry, int datasync)
return ext4_force_commit(inode->i_sb);
commit_tid = datasync ? ei->i_datasync_tid : ei->i_sync_tid;
if (jbd2_log_start_commit(journal, commit_tid))
if (jbd2_log_start_commit(journal, commit_tid)) {
/*
* When the journal is on a different device than the
* fs data disk, we need to issue the barrier in
* writeback mode. (In ordered mode, the jbd2 layer
* will take care of issuing the barrier. In
* data=journal, all of the data blocks are written to
* the journal device.)
*/
if (ext4_should_writeback_data(inode) &&
(journal->j_fs_dev != journal->j_dev) &&
(journal->j_flags & JBD2_BARRIER))
blkdev_issue_flush(inode->i_sb->s_bdev, NULL);
jbd2_log_wait_commit(journal, commit_tid);
else if (journal->j_flags & JBD2_BARRIER)
} else if (journal->j_flags & JBD2_BARRIER)
blkdev_issue_flush(inode->i_sb->s_bdev, NULL);
return ret;
}

171
fs/ext4/inode.c
View file

@ -1043,43 +1043,47 @@ static int ext4_calc_metadata_amount(struct inode *inode, int blocks)
return ext4_indirect_calc_metadata_amount(inode, blocks);
}
/*
* Called with i_data_sem down, which is important since we can call
* ext4_discard_preallocations() from here.
*/
static void ext4_da_update_reserve_space(struct inode *inode, int used)
{
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
int total, mdb, mdb_free, mdb_claim = 0;
struct ext4_inode_info *ei = EXT4_I(inode);
int mdb_free = 0;
spin_lock(&EXT4_I(inode)->i_block_reservation_lock);
/* recalculate the number of metablocks still need to be reserved */
total = EXT4_I(inode)->i_reserved_data_blocks - used;
mdb = ext4_calc_metadata_amount(inode, total);
/* figure out how many metablocks to release */
BUG_ON(mdb > EXT4_I(inode)->i_reserved_meta_blocks);
mdb_free = EXT4_I(inode)->i_reserved_meta_blocks - mdb;
if (mdb_free) {
/* Account for allocated meta_blocks */
mdb_claim = EXT4_I(inode)->i_allocated_meta_blocks;
BUG_ON(mdb_free < mdb_claim);
mdb_free -= mdb_claim;
/* update fs dirty blocks counter */
percpu_counter_sub(&sbi->s_dirtyblocks_counter, mdb_free);
EXT4_I(inode)->i_allocated_meta_blocks = 0;
EXT4_I(inode)->i_reserved_meta_blocks = mdb;
spin_lock(&ei->i_block_reservation_lock);
if (unlikely(used > ei->i_reserved_data_blocks)) {
ext4_msg(inode->i_sb, KERN_NOTICE, "%s: ino %lu, used %d "
"with only %d reserved data blocks\n",
__func__, inode->i_ino, used,
ei->i_reserved_data_blocks);
WARN_ON(1);
used = ei->i_reserved_data_blocks;
}
/* update per-inode reservations */
BUG_ON(used > EXT4_I(inode)->i_reserved_data_blocks);
EXT4_I(inode)->i_reserved_data_blocks -= used;
percpu_counter_sub(&sbi->s_dirtyblocks_counter, used + mdb_claim);
/* Update per-inode reservations */
ei->i_reserved_data_blocks -= used;
used += ei->i_allocated_meta_blocks;
ei->i_reserved_meta_blocks -= ei->i_allocated_meta_blocks;
ei->i_allocated_meta_blocks = 0;
percpu_counter_sub(&sbi->s_dirtyblocks_counter, used);
if (ei->i_reserved_data_blocks == 0) {
/*
* We can release all of the reserved metadata blocks
* only when we have written all of the delayed
* allocation blocks.
*/
mdb_free = ei->i_allocated_meta_blocks;
percpu_counter_sub(&sbi->s_dirtyblocks_counter, mdb_free);
ei->i_allocated_meta_blocks = 0;
}
spin_unlock(&EXT4_I(inode)->i_block_reservation_lock);
vfs_dq_claim_block(inode, used + mdb_claim);
/*
* free those over-booking quota for metadata blocks
*/
/* Update quota subsystem */
vfs_dq_claim_block(inode, used);
if (mdb_free)
vfs_dq_release_reservation_block(inode, mdb_free);
@ -1088,7 +1092,8 @@ static void ext4_da_update_reserve_space(struct inode *inode, int used)
* there aren't any writers on the inode, we can discard the
* inode's preallocations.
*/
if (!total && (atomic_read(&inode->i_writecount) == 0))
if ((ei->i_reserved_data_blocks == 0) &&
(atomic_read(&inode->i_writecount) == 0))
ext4_discard_preallocations(inode);
}
@ -1801,7 +1806,8 @@ static int ext4_da_reserve_space(struct inode *inode, int nrblocks)
{
int retries = 0;
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
unsigned long md_needed, mdblocks, total = 0;
struct ext4_inode_info *ei = EXT4_I(inode);
unsigned long md_needed, md_reserved, total = 0;
/*
* recalculate the amount of metadata blocks to reserve
@ -1809,35 +1815,44 @@ static int ext4_da_reserve_space(struct inode *inode, int nrblocks)
* worse case is one extent per block
*/
repeat:
spin_lock(&EXT4_I(inode)->i_block_reservation_lock);
total = EXT4_I(inode)->i_reserved_data_blocks + nrblocks;
mdblocks = ext4_calc_metadata_amount(inode, total);
BUG_ON(mdblocks < EXT4_I(inode)->i_reserved_meta_blocks);
md_needed = mdblocks - EXT4_I(inode)->i_reserved_meta_blocks;
spin_lock(&ei->i_block_reservation_lock);
md_reserved = ei->i_reserved_meta_blocks;
md_needed = ext4_calc_metadata_amount(inode, nrblocks);
total = md_needed + nrblocks;
spin_unlock(&EXT4_I(inode)->i_block_reservation_lock);
spin_unlock(&ei->i_block_reservation_lock);
/*
* Make quota reservation here to prevent quota overflow
* later. Real quota accounting is done at pages writeout
* time.
*/
if (vfs_dq_reserve_block(inode, total))
if (vfs_dq_reserve_block(inode, total)) {
/*
* We tend to badly over-estimate the amount of
* metadata blocks which are needed, so if we have
* reserved any metadata blocks, try to force out the
* inode and see if we have any better luck.
*/
if (md_reserved && retries++ <= 3)
goto retry;
return -EDQUOT;
}
if (ext4_claim_free_blocks(sbi, total)) {
vfs_dq_release_reservation_block(inode, total);
if (ext4_should_retry_alloc(inode->i_sb, &retries)) {
retry:
if (md_reserved)
write_inode_now(inode, (retries == 3));
yield();
goto repeat;
}
return -ENOSPC;
}
spin_lock(&EXT4_I(inode)->i_block_reservation_lock);
EXT4_I(inode)->i_reserved_data_blocks += nrblocks;
EXT4_I(inode)->i_reserved_meta_blocks += md_needed;
spin_unlock(&EXT4_I(inode)->i_block_reservation_lock);
spin_lock(&ei->i_block_reservation_lock);
ei->i_reserved_data_blocks += nrblocks;
ei->i_reserved_meta_blocks += md_needed;
spin_unlock(&ei->i_block_reservation_lock);
return 0; /* success */
}
@ -1845,49 +1860,45 @@ static int ext4_da_reserve_space(struct inode *inode, int nrblocks)
static void ext4_da_release_space(struct inode *inode, int to_free)
{
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
int total, mdb, mdb_free, release;
struct ext4_inode_info *ei = EXT4_I(inode);
if (!to_free)
return; /* Nothing to release, exit */
spin_lock(&EXT4_I(inode)->i_block_reservation_lock);
if (!EXT4_I(inode)->i_reserved_data_blocks) {
if (unlikely(to_free > ei->i_reserved_data_blocks)) {
/*
* if there is no reserved blocks, but we try to free some
* then the counter is messed up somewhere.
* but since this function is called from invalidate
* page, it's harmless to return without any action
* if there aren't enough reserved blocks, then the
* counter is messed up somewhere. Since this
* function is called from invalidate page, it's
* harmless to return without any action.
*/
printk(KERN_INFO "ext4 delalloc try to release %d reserved "
"blocks for inode %lu, but there is no reserved "
"data blocks\n", to_free, inode->i_ino);
spin_unlock(&EXT4_I(inode)->i_block_reservation_lock);
return;
ext4_msg(inode->i_sb, KERN_NOTICE, "ext4_da_release_space: "
"ino %lu, to_free %d with only %d reserved "
"data blocks\n", inode->i_ino, to_free,
ei->i_reserved_data_blocks);
WARN_ON(1);
to_free = ei->i_reserved_data_blocks;
}
ei->i_reserved_data_blocks -= to_free;
if (ei->i_reserved_data_blocks == 0) {
/*
* We can release all of the reserved metadata blocks
* only when we have written all of the delayed
* allocation blocks.
*/
to_free += ei->i_allocated_meta_blocks;
ei->i_allocated_meta_blocks = 0;
}
/* recalculate the number of metablocks still need to be reserved */
total = EXT4_I(inode)->i_reserved_data_blocks - to_free;
mdb = ext4_calc_metadata_amount(inode, total);
/* update fs dirty blocks counter */
percpu_counter_sub(&sbi->s_dirtyblocks_counter, to_free);
/* figure out how many metablocks to release */
BUG_ON(mdb > EXT4_I(inode)->i_reserved_meta_blocks);
mdb_free = EXT4_I(inode)->i_reserved_meta_blocks - mdb;
release = to_free + mdb_free;
/* update fs dirty blocks counter for truncate case */
percpu_counter_sub(&sbi->s_dirtyblocks_counter, release);
/* update per-inode reservations */
BUG_ON(to_free > EXT4_I(inode)->i_reserved_data_blocks);
EXT4_I(inode)->i_reserved_data_blocks -= to_free;
BUG_ON(mdb > EXT4_I(inode)->i_reserved_meta_blocks);
EXT4_I(inode)->i_reserved_meta_blocks = mdb;
spin_unlock(&EXT4_I(inode)->i_block_reservation_lock);
vfs_dq_release_reservation_block(inode, release);
vfs_dq_release_reservation_block(inode, to_free);
}
static void ext4_da_page_release_reservation(struct page *page,
@ -2967,8 +2978,7 @@ static int ext4_da_writepages(struct address_space *mapping,
out_writepages:
if (!no_nrwrite_index_update)
wbc->no_nrwrite_index_update = 0;
if (wbc->nr_to_write > nr_to_writebump)
wbc->nr_to_write -= nr_to_writebump;
wbc->nr_to_write -= nr_to_writebump;
wbc->range_start = range_start;
trace_ext4_da_writepages_result(inode, wbc, ret, pages_written);
return ret;
@ -2993,11 +3003,18 @@ static int ext4_nonda_switch(struct super_block *sb)
if (2 * free_blocks < 3 * dirty_blocks ||
free_blocks < (dirty_blocks + EXT4_FREEBLOCKS_WATERMARK)) {
/*
* free block count is less that 150% of dirty blocks
* or free blocks is less that watermark
* free block count is less than 150% of dirty blocks
* or free blocks is less than watermark
*/
return 1;
}
/*
* Even if we don't switch but are nearing capacity,
* start pushing delalloc when 1/2 of free blocks are dirty.
*/
if (free_blocks < 2 * dirty_blocks)
writeback_inodes_sb_if_idle(sb);
return 0;
}

1
fs/ext4/mballoc.h
View file

@ -17,7 +17,6 @@
#include <linux/proc_fs.h>
#include <linux/pagemap.h>
#include <linux/seq_file.h>
#include <linux/version.h>
#include <linux/blkdev.h>
#include <linux/mutex.h>
#include "ext4_jbd2.h"

6
fs/ext4/super.c
View file

@ -2174,9 +2174,9 @@ static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
struct super_block *sb = sbi->s_buddy_cache->i_sb;
return snprintf(buf, PAGE_SIZE, "%llu\n",
sbi->s_kbytes_written +
(unsigned long long)(sbi->s_kbytes_written +
((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
EXT4_SB(sb)->s_sectors_written_start) >> 1));
EXT4_SB(sb)->s_sectors_written_start) >> 1)));
}
static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
@ -4005,6 +4005,7 @@ static inline void unregister_as_ext2(void)
{
unregister_filesystem(&ext2_fs_type);
}
MODULE_ALIAS("ext2");
#else
static inline void register_as_ext2(void) { }
static inline void unregister_as_ext2(void) { }
@ -4031,6 +4032,7 @@ static inline void unregister_as_ext3(void)
{
unregister_filesystem(&ext3_fs_type);
}
MODULE_ALIAS("ext3");
#else
static inline void register_as_ext3(void) { }
static inline void unregister_as_ext3(void) { }

2
fs/ext4/xattr.c
View file

@ -1332,6 +1332,8 @@ int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize,
goto cleanup;
kfree(b_entry_name);
kfree(buffer);
b_entry_name = NULL;
buffer = NULL;
brelse(is->iloc.bh);
kfree(is);
kfree(bs);

17
fs/fs-writeback.c
View file

@ -1186,6 +1186,23 @@ void writeback_inodes_sb(struct super_block *sb)
}
EXPORT_SYMBOL(writeback_inodes_sb);
/**
* writeback_inodes_sb_if_idle - start writeback if none underway
* @sb: the superblock
*
* Invoke writeback_inodes_sb if no writeback is currently underway.
* Returns 1 if writeback was started, 0 if not.
*/
int writeback_inodes_sb_if_idle(struct super_block *sb)
{
if (!writeback_in_progress(sb->s_bdi)) {
writeback_inodes_sb(sb);
return 1;
} else
return 0;
}
EXPORT_SYMBOL(writeback_inodes_sb_if_idle);
/**
* sync_inodes_sb - sync sb inode pages
* @sb: the superblock

15
fs/jbd2/checkpoint.c
View file

@ -22,6 +22,7 @@
#include <linux/jbd2.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/blkdev.h>
#include <trace/events/jbd2.h>
/*
@ -515,6 +516,20 @@ int jbd2_cleanup_journal_tail(journal_t *journal)
journal->j_tail_sequence = first_tid;
journal->j_tail = blocknr;
spin_unlock(&journal->j_state_lock);
/*
* If there is an external journal, we need to make sure that
* any data blocks that were recently written out --- perhaps
* by jbd2_log_do_checkpoint() --- are flushed out before we
* drop the transactions from the external journal. It's
* unlikely this will be necessary, especially with a
* appropriately sized journal, but we need this to guarantee
* correctness. Fortunately jbd2_cleanup_journal_tail()
* doesn't get called all that often.
*/
if ((journal->j_fs_dev != journal->j_dev) &&
(journal->j_flags & JBD2_BARRIER))
blkdev_issue_flush(journal->j_fs_dev, NULL);
if (!(journal->j_flags & JBD2_ABORT))
jbd2_journal_update_superblock(journal, 1);
return 0;

19
fs/jbd2/commit.c
View file

@ -259,6 +259,7 @@ static int journal_submit_data_buffers(journal_t *journal,
ret = err;
spin_lock(&journal->j_list_lock);
J_ASSERT(jinode->i_transaction == commit_transaction);
commit_transaction->t_flushed_data_blocks = 1;
jinode->i_flags &= ~JI_COMMIT_RUNNING;
wake_up_bit(&jinode->i_flags, __JI_COMMIT_RUNNING);
}
@ -708,8 +709,17 @@ void jbd2_journal_commit_transaction(journal_t *journal)
}
}
/* Done it all: now write the commit record asynchronously. */
/*
* If the journal is not located on the file system device,
* then we must flush the file system device before we issue
* the commit record
*/
if (commit_transaction->t_flushed_data_blocks &&
(journal->j_fs_dev != journal->j_dev) &&
(journal->j_flags & JBD2_BARRIER))
blkdev_issue_flush(journal->j_fs_dev, NULL);
/* Done it all: now write the commit record asynchronously. */
if (JBD2_HAS_INCOMPAT_FEATURE(journal,
JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT)) {
err = journal_submit_commit_record(journal, commit_transaction,
@ -720,13 +730,6 @@ void jbd2_journal_commit_transaction(journal_t *journal)
blkdev_issue_flush(journal->j_dev, NULL);
}
/*
* This is the right place to wait for data buffers both for ASYNC
* and !ASYNC commit. If commit is ASYNC, we need to wait only after
* the commit block went to disk (which happens above). If commit is
* SYNC, we need to wait for data buffers before we start writing
* commit block, which happens below in such setting.
*/
err = journal_finish_inode_data_buffers(journal, commit_transaction);
if (err) {
printk(KERN_WARNING

2
fs/jbd2/journal.c
View file

@ -814,7 +814,7 @@ static journal_t * journal_init_common (void)
journal_t *journal;
int err;
journal = kzalloc(sizeof(*journal), GFP_KERNEL|__GFP_NOFAIL);
journal = kzalloc(sizeof(*journal), GFP_KERNEL);
if (!journal)
goto fail;

1
include/linux/jbd2.h
View file

@ -653,6 +653,7 @@ struct transaction_s
* waiting for it to finish.
*/
unsigned int t_synchronous_commit:1;
unsigned int t_flushed_data_blocks:1;
/*
* For use by the filesystem to store fs-specific data

1
include/linux/writeback.h
View file

@ -70,6 +70,7 @@ struct writeback_control {
struct bdi_writeback;
int inode_wait(void *);
void writeback_inodes_sb(struct super_block *);
int writeback_inodes_sb_if_idle(struct super_block *);
void sync_inodes_sb(struct super_block *);
void writeback_inodes_wbc(struct writeback_control *wbc);
long wb_do_writeback(struct bdi_writeback *wb, int force_wait);