linux/fs/xfs/linux-2.6
Dave Chinner c726de4409 xfs: fix failed write truncation handling.
Since the move to the new truncate sequence we call xfs_setattr to
truncate down excessively instanciated blocks.  As shown by the testcase
in kernel.org BZ #22452 that doesn't work too well.  Due to the confusion
of the internal inode size, and the VFS inode i_size it zeroes data that
it shouldn't.

But full blown truncate seems like overkill here.  We only instanciate
delayed allocations in the write path, and given that we never released
the iolock we can't have converted them to real allocations yet either.

The only nasty case is pre-existing preallocation which we need to skip.
We already do this for page discard during writeback, so make the delayed
allocation block punching a generic function and call it from the failed
write path as well as xfs_aops_discard_page. The callers are
responsible for ensuring that partial blocks are not truncated away,
and that they hold the ilock.

Based on a fix originally from Christoph Hellwig. This version used
filesystem blocks as the range unit.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
2010-12-01 07:40:19 -06:00
..
kmem.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
kmem.h xfs: replace KM_LARGE with explicit vmalloc use 2010-01-21 13:44:56 -06:00
mrlock.h [XFS] shrink mrlock_t 2008-04-29 15:54:02 +10:00
sv.h remove dead code from sv_t implementation 2008-12-04 15:39:21 +11:00
time.h
xfs_acl.c xfs: split xfs_itrace_entry 2010-07-26 13:16:44 -05:00
xfs_aops.c xfs: fix failed write truncation handling. 2010-12-01 07:40:19 -06:00
xfs_aops.h direct-io: move aio_complete into ->end_io 2010-07-26 16:09:02 -05:00
xfs_buf.c xfs: move delayed write buffer trace 2010-11-10 12:00:48 -06:00
xfs_buf.h Merge branch 'for-linus' of git://oss.sgi.com/xfs/xfs 2010-10-22 17:32:27 -07:00
xfs_export.c xfs: remove xfs_iput_new 2010-07-26 13:16:44 -05:00
xfs_export.h xfs: new export ops 2007-10-22 08:13:20 -07:00
xfs_file.c xfs: remove a dmapi leftover 2010-07-26 13:16:47 -05:00
xfs_fs_subr.c xfs: use range primitives for xfs page cache operations 2010-10-18 15:07:24 -05:00
xfs_globals.c xfs: remove xfs_cred.h 2010-10-18 15:08:06 -05:00
xfs_ioctl32.c xfs: Extend project quotas to support 32bit project ids 2010-10-18 15:08:08 -05:00
xfs_ioctl32.h xfs: Extend project quotas to support 32bit project ids 2010-10-18 15:08:08 -05:00
xfs_ioctl.c xfs: xfs_ioctl: fix information leak to userland 2010-11-10 12:00:47 -06:00
xfs_ioctl.h xfs: convert attr to use unsigned names 2010-01-20 10:47:48 +11:00
xfs_iops.c xfs: use hlist_add_fake 2010-11-10 12:00:48 -06:00
xfs_iops.h [XFS] add a FMODE flag to make XFS invisible I/O less hacky 2008-12-11 13:14:41 +11:00
xfs_linux.h xfs: Extend project quotas to support 32bit project ids 2010-10-18 15:08:08 -05:00
xfs_quotaops.c Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6 2010-08-07 12:57:07 -07:00
xfs_stats.c xfs: switch to seq_file 2009-09-15 12:29:24 -05:00
xfs_stats.h [XFS] add new btree statistics 2008-10-30 16:55:03 +11:00
xfs_super.c xfs: remove experimental tag from the delaylog option 2010-11-10 12:00:47 -06:00
xfs_super.h xfs: remove xfs_version.h 2010-10-18 15:08:04 -05:00
xfs_sync.c xfs: fix per-ag reference counting in inode reclaim tree walking 2010-11-10 12:00:48 -06:00
xfs_sync.h xfs: implement batched inode lookups for AG walking 2010-10-18 15:07:53 -05:00
xfs_sysctl.c sysctl: Drop & in front of every proc_handler. 2009-11-18 08:37:40 -08:00
xfs_sysctl.h [XFS] remove restricted chown parameter from xfs linux 2008-10-30 18:30:48 +11:00
xfs_trace.c xfs: remove unneeded #include statements 2010-07-26 13:16:33 -05:00
xfs_trace.h Merge branch 'for-linus' of git://oss.sgi.com/xfs/xfs 2010-10-22 17:32:27 -07:00
xfs_vnode.h xfs: event tracing support 2009-12-14 23:08:16 -06:00
xfs_xattr.c xfs: constify xattr_handler 2010-05-21 18:31:19 -04:00