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b686d1f xfs: xfs_seek_hole() refinement with hole searching from page cache for unwritten extents
52f1acc xfs: xfs_seek_data() refinement with unwritten extents check up from page cache
d126d43 xfs: Introduce a helper routine to probe data or hole offset from page cache
834ab12 xfs: Remove type argument from xfs_seek_data()/xfs_seek_hole()
e599b32 xfs: fix race while discarding buffers [V4]
from 643bfc061c47e9c7661324a09fb0a0bc6601e5d6 (commit)
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commit b686d1f79acb65c6a34473c15fcfa2ee54aed8e2
Author: Jeff Liu <jeff.liu@xxxxxxxxxx>
Date: Tue Aug 21 17:12:18 2012 +0800
xfs: xfs_seek_hole() refinement with hole searching from page cache for unwritten extents
xfs_seek_hole() refinement with hole searching from page cache for unwritten extent.
Signed-off-by: Jie Liu <jeff.liu@xxxxxxxxxx>
Reviewed-by: Mark Tinguely <tinguely@xxxxxxx>
Reviewed-by: Dave Chinner <dchinner@xxxxxxxxxx>
Signed-off-by: Ben Myers <bpm@xxxxxxx>
commit 52f1acc8b56a333fbc7218711c3fa2fb3bf78b92
Author: Jeff Liu <jeff.liu@xxxxxxxxxx>
Date: Tue Aug 21 17:12:07 2012 +0800
xfs: xfs_seek_data() refinement with unwritten extents check up from page cache
xfs_seek_data() refinement with unwritten extents check up from page cache.
Signed-off-by: Jie Liu <jeff.liu@xxxxxxxxxx>
Reviewed-by: Mark Tinguely <tinguely@xxxxxxx>
Reviewed-by: Dave Chinner <dchinner@xxxxxxxxxx>
Signed-off-by: Ben Myers <bpm@xxxxxxx>
commit d126d43f631f996daeee5006714fed914be32368
Author: Jeff Liu <jeff.liu@xxxxxxxxxx>
Date: Tue Aug 21 17:11:57 2012 +0800
xfs: Introduce a helper routine to probe data or hole offset from page cache
Introduce helpers to probe data or hole offset from page cache.
Signed-off-by: Jie Liu <jeff.liu@xxxxxxxxxx>
Reviewed-by: Mark Tinguely <tinguely@xxxxxxx>
Reviewed-by: Dave Chinner <dchinner@xxxxxxxxxx>
Signed-off-by: Ben Myers <bpm@xxxxxxx>
commit 834ab12228fad777a11007a24cb6286b02c9a41c
Author: Jeff Liu <jeff.liu@xxxxxxxxxx>
Date: Tue Aug 21 17:11:45 2012 +0800
xfs: Remove type argument from xfs_seek_data()/xfs_seek_hole()
The type is already indicated by the function naming explicitly, so this argument
can be omitted from those calls.
Signed-off-by: Jie Liu <jeff.liu@xxxxxxxxxx>
Reviewed-by: Mark Tinguely <tinguely@xxxxxxx>
Reviewed-by: Dave Chinner <dchinner@xxxxxxxxxx>
Signed-off-by: Ben Myers <bpm@xxxxxxx>
commit e599b3253c5e49f7a2a579eef2fc2aa066989ef5
Author: Carlos Maiolino <cmaiolino@xxxxxxxxxx>
Date: Fri Aug 10 15:01:51 2012 -0300
xfs: fix race while discarding buffers [V4]
While xfs_buftarg_shrink() is freeing buffers from the dispose list (filled with
buffers from lru list), there is a possibility to have xfs_buf_stale() racing
with it, and removing buffers from dispose list before xfs_buftarg_shrink() does
it.
This happens because xfs_buftarg_shrink() handle the dispose list without
locking and the test condition in xfs_buf_stale() checks for the buffer being in
*any* list:
if (!list_empty(&bp->b_lru))
If the buffer happens to be on dispose list, this causes the buffer counter of
lru list (btp->bt_lru_nr) to be decremented twice (once in xfs_buftarg_shrink()
and another in xfs_buf_stale()) causing a wrong account usage of the lru list.
This may cause xfs_buftarg_shrink() to return a wrong value to the memory
shrinker shrink_slab(), and such account error may also cause an underflowed
value to be returned; since the counter is lower than the current number of
items in the lru list, a decrement may happen when the counter is 0, causing
an underflow on the counter.
The fix uses a new flag field (and a new buffer flag) to serialize buffer
handling during the shrink process. The new flag field has been designed to use
btp->bt_lru_lock/unlock instead of xfs_buf_lock/unlock mechanism.
dchinner, sandeen, aquini and aris also deserve credits for this.
Signed-off-by: Carlos Maiolino <cmaiolino@xxxxxxxxxx>
Reviewed-by: Ben Myers <bpm@xxxxxxx>
Reviewed-by: Dave Chinner <dchinner@xxxxxxxxxx>
Signed-off-by: Ben Myers <bpm@xxxxxxx>
-----------------------------------------------------------------------
Summary of changes:
fs/xfs/xfs_buf.c | 5 +-
fs/xfs/xfs_buf.h | 41 +++---
fs/xfs/xfs_file.c | 379 ++++++++++++++++++++++++++++++++++++++++++++++++-----
3 files changed, 372 insertions(+), 53 deletions(-)
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