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2 writeback fixes

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- fix negative (setpoint - dirty) in 32bit archs
 - use down_read_trylock() in writeback_inodes_sb(_nr)_if_idle()
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Merge tag 'writeback-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux

Pull writeback fixes from Wu Fengguang:
 "Two writeback fixes

   - fix negative (setpoint - dirty) in 32bit archs

   - use down_read_trylock() in writeback_inodes_sb(_nr)_if_idle()"

* tag 'writeback-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux:
  Negative (setpoint-dirty) in bdi_position_ratio()
  vfs: re-implement writeback_inodes_sb(_nr)_if_idle() and rename them
This commit is contained in:
Linus Torvalds 2013-02-28 13:21:44 -08:00
commit de1a2262b0
5 changed files with 37 additions and 59 deletions
Download patch file Download diff file Expand all files Collapse all files

60
fs/fs-writeback.c
View file

@ -1344,47 +1344,43 @@ void writeback_inodes_sb(struct super_block *sb, enum wb_reason reason)
EXPORT_SYMBOL(writeback_inodes_sb);
/**
* writeback_inodes_sb_if_idle - start writeback if none underway
* @sb: the superblock
* @reason: reason why some writeback work was initiated
*
* 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, enum wb_reason reason)
{
if (!writeback_in_progress(sb->s_bdi)) {
down_read(&sb->s_umount);
writeback_inodes_sb(sb, reason);
up_read(&sb->s_umount);
return 1;
} else
return 0;
}
EXPORT_SYMBOL(writeback_inodes_sb_if_idle);
/**
* writeback_inodes_sb_nr_if_idle - start writeback if none underway
* try_to_writeback_inodes_sb_nr - try to start writeback if none underway
* @sb: the superblock
* @nr: the number of pages to write
* @reason: reason why some writeback work was initiated
* @reason: the reason of writeback
*
* Invoke writeback_inodes_sb if no writeback is currently underway.
* Invoke writeback_inodes_sb_nr if no writeback is currently underway.
* Returns 1 if writeback was started, 0 if not.
*/
int writeback_inodes_sb_nr_if_idle(struct super_block *sb,
unsigned long nr,
enum wb_reason reason)
int try_to_writeback_inodes_sb_nr(struct super_block *sb,
unsigned long nr,
enum wb_reason reason)
{
if (!writeback_in_progress(sb->s_bdi)) {
down_read(&sb->s_umount);
writeback_inodes_sb_nr(sb, nr, reason);
up_read(&sb->s_umount);
if (writeback_in_progress(sb->s_bdi))
return 1;
} else
if (!down_read_trylock(&sb->s_umount))
return 0;
writeback_inodes_sb_nr(sb, nr, reason);
up_read(&sb->s_umount);
return 1;
}
EXPORT_SYMBOL(writeback_inodes_sb_nr_if_idle);
EXPORT_SYMBOL(try_to_writeback_inodes_sb_nr);
/**
* try_to_writeback_inodes_sb - try to start writeback if none underway
* @sb: the superblock
* @reason: reason why some writeback work was initiated
*
* Implement by try_to_writeback_inodes_sb_nr()
* Returns 1 if writeback was started, 0 if not.
*/
int try_to_writeback_inodes_sb(struct super_block *sb, enum wb_reason reason)
{
return try_to_writeback_inodes_sb_nr(sb, get_nr_dirty_pages(), reason);
}
EXPORT_SYMBOL(try_to_writeback_inodes_sb);
/**
* sync_inodes_sb - sync sb inode pages