AuxXxilium/linux_dsm_epyc7002
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c3473e8300
linux_dsm_epyc7002/fs/btrfs
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Josef Bacik c3473e8300 Btrfs: fix dio write vs buffered read race 
Miao pointed out there's a problem with mixing dio writes and buffered
reads.  If the read happens between us invalidating the page range and
actually locking the extent we can bring in pages into page cache.  Then
once the write finishes if somebody tries to read again it will just find
uptodate pages and we'll read stale data.  So we need to lock the extent and
check for uptodate bits in the range.  If there are uptodate bits we need to
unlock and invalidate again.  This will keep this race from happening since
we will hold the extent locked until we create the ordered extent, and then
teh read side always waits for ordered extents.  There was also a race in
how we updated i_size, previously we were relying on the generic DIO stuff
to adjust the i_size after the DIO had completed, but this happens outside
of the extent lock which means reads could come in and not see the updated
i_size.  So instead move this work into where we create the extents, and
then this way the update ordered i_size stuff works properly in the endio
handlers.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
2012-07-02 15:36:23 -04:00
..
acl.c Btrfs: cache no acl on new inodes 2012-05-30 10:23:27 -04:00
async-thread.c btrfs: return void in functions without error conditions 2012-03-22 01:45:34 +01:00
async-thread.h btrfs: return void in functions without error conditions 2012-03-22 01:45:34 +01:00
backref.c Btrfs: leave critical region in btrfs_find_all_roots as soon as possible 2012-06-27 16:34:39 +02:00
backref.h Btrfs: use the tree modification log for backref resolving 2012-05-30 15:17:34 +02:00
btrfs_inode.h Btrfs: call filemap_fdatawrite twice for compression 2012-06-14 21:30:54 -04:00
check-integrity.c Btrfs: use rcu to protect device->name 2012-06-14 21:29:16 -04:00
check-integrity.h Btrfs: add optional integrity check code 2011-12-21 19:14:09 +01:00
compat.h Btrfs: drop remaining LINUX_KERNEL_VERSION checks and compat code 2009-01-06 09:38:55 -05:00
compression.c Merge branch 'for-linus-min' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs 2012-04-13 19:41:27 -07:00
compression.h btrfs: return void in functions without error conditions 2012-03-22 01:45:34 +01:00
ctree.c Btrfs: resolve tree mod log locking issue in btrfs_next_leaf 2012-06-27 16:34:40 +02:00
ctree.h Btrfs: introduce btrfs_next_old_item 2012-06-21 07:19:34 -04:00
delayed-inode.c Btrfs: destroy the items of the delayed inodes in error handling routine 2012-06-15 11:42:28 -04:00
delayed-inode.h Btrfs: destroy the items of the delayed inodes in error handling routine 2012-06-15 11:42:28 -04:00
delayed-ref.c Btrfs: use delayed ref sequence numbers for all fs-tree updates 2012-05-30 18:18:21 +02:00
delayed-ref.h Btrfs: use delayed ref sequence numbers for all fs-tree updates 2012-05-30 18:18:21 +02:00
dir-item.c btrfs: replace many BUG_ONs with proper error handling 2012-03-22 11:52:54 +01:00
disk-io.c Btrfs: add a missing spin_lock 2012-06-21 07:19:35 -04:00
disk-io.h btrfs: Drop unused function btrfs_abort_devices() 2012-05-30 10:23:39 -04:00
export.c btrfs: replace many BUG_ONs with proper error handling 2012-03-22 11:52:54 +01:00
export.h NFS support for btrfs - v3 2008-09-25 11:04:06 -04:00
extent_io.c Btrfs: use rcu to protect device->name 2012-06-14 21:29:16 -04:00
extent_io.h Merge branch 'for-chris' of git://git.jan-o-sch.net/btrfs-unstable into for-linus 2012-05-31 16:49:53 -04:00
extent_map.c Btrfs: clean up code for merging extent maps 2011-08-01 14:30:50 -04:00
extent_map.h btrfs: fix structs where bitfields and spinlock/atomic share 8B word 2012-02-15 16:40:25 +01:00
extent-tree.c Btrfs: avoid waiting for delayed refs when we must not 2012-06-27 16:34:35 +02:00
file-item.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs 2012-03-30 12:44:29 -07:00
file.c Btrfs: fix dio write vs buffered read race 2012-07-02 15:36:23 -04:00
free-space-cache.c Btrfs: merge contigous regions when loading free space cache 2012-05-30 10:23:36 -04:00
free-space-cache.h btrfs: remove all unused functions 2011-05-06 12:34:03 +02:00
hash.h Btrfs: remove crc32c.h and use libcrc32c directly. 2009-06-10 11:29:53 -04:00
inode-item.c Merge branch 'error-handling' into for-linus 2012-03-28 20:31:37 -04:00
inode-map.c Btrfs: show useful info in space reservation tracepoint 2012-03-29 09:57:44 -04:00
inode-map.h Btrfs: Support reading/writing on disk free ino cache 2011-04-25 16:46:11 +08:00
inode.c Btrfs: fix dio write vs buffered read race 2012-07-02 15:36:23 -04:00
ioctl.c Btrfs: cast devid to unsigned long long for printk %llu 2012-06-15 20:07:17 -04:00
ioctl.h Btrfs: add ioctl to get and reset the device stats 2012-05-30 10:23:40 -04:00
Kconfig Btrfs: add config option to enable btrfs integrity check 2011-12-21 19:14:16 +01:00
locking.c btrfs: return void in functions without error conditions 2012-03-22 01:45:34 +01:00
locking.h btrfs: return void in functions without error conditions 2012-03-22 01:45:34 +01:00
lzo.c btrfs: remove the second argument of k[un]map_atomic() 2012-03-20 21:48:21 +08:00
Makefile Merge branch 'integrity-check-patch-v2' of git://btrfs.giantdisaster.de/git/btrfs into integration 2012-01-16 15:27:58 -05:00
ordered-data.c Btrfs: call filemap_fdatawrite twice for compression 2012-06-14 21:30:54 -04:00
ordered-data.h Btrfs: finish ordered extents in their own thread 2012-05-30 10:23:33 -04:00
orphan.c btrfs: replace many BUG_ONs with proper error handling 2012-03-22 11:52:54 +01:00
print-tree.c Btrfs: read device stats on mount, write modified ones during commit 2012-05-30 10:23:41 -04:00
print-tree.h
rcu-string.h Btrfs: use rcu to protect device->name 2012-06-14 21:29:16 -04:00
reada.c Btrfs: set ioprio of scrub readahead to idle 2012-05-30 10:23:43 -04:00
relocation.c Btrfs: Fix space checking during fs resize 2012-04-27 13:55:14 -04:00
root-tree.c btrfs: replace many BUG_ONs with proper error handling 2012-03-22 11:52:54 +01:00
scrub.c Btrfs: use rcu to protect device->name 2012-06-14 21:29:16 -04:00
struct-funcs.c Btrfs: add the ability to cache a pointer into the eb 2012-03-26 17:04:23 -04:00
super.c Btrfs: implement ->show_devname 2012-06-14 21:30:37 -04:00
sysfs.c btrfs: Remove unused sysfs code 2011-06-17 14:54:18 -04:00
transaction.c Btrfs: abort the transaction if the commit fails 2012-06-14 21:29:13 -04:00
transaction.h btrfs: enhance transaction abort infrastructure 2012-03-22 01:45:40 +01:00
tree-defrag.c btrfs: drop unused parameter from btrfs_release_path 2011-05-02 13:57:22 +02:00
tree-log.c Btrfs: fix return code in drop_objectid_items 2012-05-30 10:23:42 -04:00
tree-log.h btrfs: return void in functions without error conditions 2012-03-22 01:45:34 +01:00
ulist.c Merge branch 'for-chris' of git://git.jan-o-sch.net/btrfs-unstable into for-linus 2012-05-31 16:49:53 -04:00
ulist.h Merge branch 'for-chris' of git://git.jan-o-sch.net/btrfs-unstable into for-linus 2012-05-31 16:49:53 -04:00
version.h Update Btrfs files for in-kernel usage 2008-09-25 15:41:59 -04:00
volumes.c Btrfs: don't count I/O statistic read errors for missing devices 2012-07-02 15:36:23 -04:00
volumes.h Btrfs: use rcu to protect device->name 2012-06-14 21:29:16 -04:00
xattr.c Btrfs: use i_version instead of our own sequence 2012-05-30 10:23:27 -04:00
xattr.h fs/vfs/security: pass last path component to LSM on inode creation 2011-02-01 11:12:29 -05:00
zlib.c btrfs: remove the second argument of k[un]map_atomic() 2012-03-20 21:48:21 +08:00