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Jens Axboe ad8d6f0a78 [PATCH] splice: page stealing needs to wait_on_page_writeback() 
Thanks to Andrew for the good explanation of why this is so. akpm writes:

If a page is under writeback and we remove it from pagecache, it's still
going to get written to disk.  But the VFS no longer knows about that page,
nor that this page is about to modify disk blocks.

So there might be scenarios in which those
blocks-which-are-about-to-be-written-to get reused for something else.
When writeback completes, it'll scribble on those blocks.

This won't happen in ext2/ext3-style filesystems in normal mode because the
page has buffers and try_to_release_page() will fail.

But ext2 in nobh mode doesn't attach buffers at all - it just sticks the
page in a BIO, finds some new blocks, points the BIO at those blocks and
lets it rip.

While that write IO's in flight, someone could truncate the file.  Truncate
won't block on the writeout because the page isn't in pagecache any more.
So truncate will the free the blocks from the file under the page's feet.
Then something else can reallocate those blocks.  Then write data to them.

Now, the original write completes, corrupting the filesystem.

Signed-off-by: Jens Axboe <axboe@suse.de>
 		2006-04-02 23:10:32 +02:00
..
9p [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
adfs [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
affs [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
afs [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
autofs [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
autofs4 [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
befs [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
bfs [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
cifs [CIFS] Fix typo in earlier cifs_unlink change and protect one 2006-03-31 22:43:50 +00:00
coda [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
configfs [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
cramfs [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
debugfs [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
devfs [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
devpts [PATCH] devpts: use lib/parser.c for parsing mount options 2006-03-23 07:38:17 -08:00
efs [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
exportfs [PATCH] exportfs: add find_acceptable_alias helper 2006-01-18 19:20:28 -08:00
ext2 [PATCH] Introduce sys_splice() system call 2006-03-30 12:28:18 -08:00
ext3 [PATCH] Introduce sys_splice() system call 2006-03-30 12:28:18 -08:00
fat [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
freevxfs [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
fuse [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
hfs [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
hfsplus [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
hostfs [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
hpfs [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
hppfs [PATCH] uml: __user annotations 2006-03-31 12:18:51 -08:00
hugetlbfs [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
isofs [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
jbd [PATCH] Make address_space_operations->invalidatepage return void 2006-03-26 08:56:55 -08:00
jffs [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
jffs2 [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
jfs [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
lockd [PATCH] sem2mutex: fs/ 2006-03-26 08:56:55 -08:00
minix [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
msdos [PATCH] fat: kill reserved names 2006-03-31 12:18:55 -08:00
ncpfs [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
nfs [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
nfs_common [PATCH] nfsacl: Solaris VxFS compatibility fix 2005-10-11 09:46:54 -07:00
nfsd [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
nls [PATCH] fs: Use ARRAY_SIZE macro 2006-03-24 07:33:19 -08:00
ntfs [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
ocfs2 [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
openpromfs [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
partitions Merge ../linux-2.6 2006-03-29 13:24:50 +11:00
proc [PATCH] cleanup in proc_check_chroot() 2006-03-31 12:18:59 -08:00
qnx4 [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
ramfs [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
reiserfs [PATCH] Introduce sys_splice() system call 2006-03-30 12:28:18 -08:00
romfs [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
smbfs [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
sysfs [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
sysv [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
udf [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
ufs [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
vfat [PATCH] fat: kill reserved names 2006-03-31 12:18:55 -08:00
xfs [XFS] Cleanup in XFS after recent get_block_t interface tweaks. 2006-03-29 10:44:40 +10:00
Kconfig Merge branch 'linus' 2006-03-23 23:44:19 -05:00
Kconfig.binfmt [PATCH] frv: suppress configuration of certain features for FRV 2006-01-08 20:13:36 -08:00
Makefile [PATCH] sys_sync_file_range() 2006-03-31 12:18:54 -08:00
aio.c [PATCH] use kzalloc and kcalloc in core fs code 2006-03-25 08:23:00 -08:00
attr.c [PATCH] capable/capability.h (fs/) 2006-01-11 18:42:13 -08:00
bad_inode.c [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
binfmt_aout.c [PATCH] dump_thread() cleanup 2006-01-10 08:01:25 -08:00
binfmt_elf.c [PATCH] x86_64: Increase the variability of the process stack on 64bit architectures 2006-03-25 09:10:52 -08:00
binfmt_elf_fdpic.c BUG_ON() Conversion in fs/binfmt_elf_fdpic.c 2006-03-24 18:38:48 +01:00
binfmt_em86.c
…
binfmt_flat.c [PATCH] flat binary loader doesn't check fd table full 2006-03-25 08:23:01 -08:00
binfmt_misc.c [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
binfmt_script.c
…
binfmt_som.c [PATCH] mm: mm_init set_mm_counters 2005-10-29 21:40:38 -07:00
bio.c [PATCH] mempool: use mempool_create_slab_pool() 2006-03-26 08:57:00 -08:00
block_dev.c [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
buffer.c [PATCH] for_each_online_pgdat: renaming for_each_pgdat 2006-03-27 08:44:48 -08:00
char_dev.c [PATCH] Simplify proc/devices and fix early termination regression 2006-03-31 12:18:53 -08:00
compat.c [PATCH] Fold select_bits_alloc/free into caller code. 2006-03-28 09:16:04 -08:00
compat_ioctl.c [PATCH] fs: Use ARRAY_SIZE macro 2006-03-24 07:33:19 -08:00
dcache.c [PATCH] dcache: Add helper d_hash_and_lookup 2006-03-31 12:19:00 -08:00
dcookies.c [PATCH] Use __read_mostly on some hot fs variables 2006-03-26 08:56:56 -08:00
direct-io.c Fixes a regression from the recent "remove ->get_blocks() support" 2006-03-29 09:26:15 +10:00
dnotify.c [PATCH] Use __read_mostly on some hot fs variables 2006-03-26 08:56:56 -08:00
dquot.c [PATCH] cpuset memory spread: slab cache format 2006-03-24 07:33:23 -08:00
drop_caches.c [PATCH] drop-pagecache 2006-01-08 20:12:40 -08:00
eventpoll.c [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
exec.c [PATCH] convert sighand_cache to use SLAB_DESTROY_BY_RCU 2006-03-28 18:36:42 -08:00
fcntl.c [PATCH] Use __read_mostly on some hot fs variables 2006-03-26 08:56:56 -08:00
fifo.c [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
file.c [PATCH] for_each_possible_cpu: fixes for generic part 2006-03-28 09:16:05 -08:00
file_table.c [PATCH] get_empty_filp tweaks, inline epoll_init_file() 2006-03-23 07:38:17 -08:00
filesystems.c [PATCH] fix missing includes 2005-10-30 17:37:32 -08:00
fs-writeback.c [PATCH] Move cond_resched() after iput() in sync_sb_inodes() 2006-03-25 08:22:56 -08:00
inode.c [PATCH] mark f_ops const in the inode 2006-03-28 09:16:05 -08:00
inotify.c [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
ioctl.c [PATCH] capable/capability.h (fs/) 2006-01-11 18:42:13 -08:00
ioprio.c [PATCH] capable/capability.h (fs/) 2006-01-11 18:42:13 -08:00
libfs.c [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
locks.c [PATCH] fs/locks.c: Fix sys_flock() race 2006-03-31 12:18:56 -08:00
mbcache.c [PATCH] Typo fixes 2006-03-28 09:16:08 -08:00
mpage.c [PATCH] map multiple blocks for mpage_readpages() 2006-03-26 08:57:01 -08:00
namei.c [PATCH] fs/namei.c: make lookup_hash() static 2006-03-31 12:19:01 -08:00
namespace.c [PATCH] autofs4: change may_umount* functions to boolean 2006-03-27 08:44:40 -08:00
nfsctl.c [PATCH] fs: Use ARRAY_SIZE macro 2006-03-24 07:33:19 -08:00
open.c Merge branch 'audit.b3' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/audit-current 2006-03-25 09:24:53 -08:00
pipe.c [PATCH] splice: improve writeback and clean up page stealing 2006-04-02 23:04:46 +02:00
pnode.c [PATCH] s/;;/;/g 2006-03-24 07:33:24 -08:00
pnode.h [PATCH] unbindable mounts 2005-11-07 18:18:11 -08:00
posix_acl.c [PATCH] gfp flags annotations - part 1 2005-10-08 15:00:57 -07:00
quota.c [PATCH] sem2mutex: quota 2006-03-23 07:38:11 -08:00
quota_v1.c
…
quota_v2.c [PATCH] sem2mutex: quota 2006-03-23 07:38:11 -08:00
read_write.c [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
readdir.c [PATCH] mutex subsystem, semaphore to mutex: VFS, ->i_sem 2006-01-09 15:59:24 -08:00
select.c [PATCH] avoid unaligned access when accessing poll stack 2006-03-31 12:30:48 -08:00
seq_file.c [PATCH] sem2mutex: fs/seq_file.c 2006-03-23 07:38:12 -08:00
splice.c [PATCH] splice: page stealing needs to wait_on_page_writeback() 2006-04-02 23:10:32 +02:00
stat.c [PATCH] fstatat64 support 2006-02-11 21:41:10 -08:00
super.c [PATCH] sem2mutex: fs/ 2006-03-26 08:56:55 -08:00
sync.c [PATCH] sys_sync_file_range() 2006-03-31 12:18:54 -08:00
xattr.c [PATCH] Collect more inode information during syscall processing. 2006-03-20 14:08:53 -05:00
xattr_acl.c
…