diff options
author | Andrew Morton <akpm@linux-foundation.org> | 2007-10-17 02:30:36 -0400 |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-17 11:43:02 -0400 |
commit | c6945e77e477103057b4a639b4b01596f5257861 (patch) | |
tree | 02e6b473143060cdec08f3d8447512d56ea699bd /include/asm-mips/bitops.h | |
parent | 1b43ef91d40190b16ba10218e66d5c2c4ba11de3 (diff) |
writeback: fix time ordering of the per superblock dirty inode lists 5
When the writeback function is operating in writeback-for-flushing mode (as
opposed to writeback-for-integrity) and it encounters an I_LOCKed inode, it
will skip writing that inode. This is done for throughput and latency: move
on to another inode rather than blocking for this one.
Writeback skips this inode by moving it off s_io and onto s_dirty, so that
writeback can proceed with the other inodes on s_io.
However that inode movement can corrupt s_dirty's reverse-time-orderedness.
Fix that by using the new redirty_tail(), which will update the refiled
inode's dirtied_when field.
Note: the behaviour in here is a bit rude: if kupdate happens to come across a
locked inode then it will defer writeback of that inode for another 30
seconds. We'll address that in the next patch.
Cc: Mike Waychison <mikew@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/asm-mips/bitops.h')
0 files changed, 0 insertions, 0 deletions