[[ this was already added to 3.4-stable, I am sending it to the stable
mailing list for 3.2, 3.0 and others stable kernels ]]
This is backport of upstream commit
bbd465df73f0d8ba41b8a0732766a243d0f5b356, modified for stable kernels
2.6.39 - 3.7.
This patch fixes warnings due to missing lock on write error path.
WARNING: at fs/hpfs/hpfs_fn.h:353 hpfs_truncate+0x75/0x80 [hpfs]()
Hardware name: empty
Pid: 26563, comm: dd Tainted: P O 3.9.4 #12
Call Trace:
hpfs_truncate+0x75/0x80 [hpfs]
hpfs_write_begin+0x84/0x90 [hpfs]
_hpfs_bmap+0x10/0x10 [hpfs]
generic_file_buffered_write+0x121/0x2c0
__generic_file_aio_write+0x1c7/0x3f0
generic_file_aio_write+0x7c/0x100
do_sync_write+0x98/0xd0
hpfs_file_write+0xd/0x50 [hpfs]
vfs_write+0xa2/0x160
sys_write+0x51/0xa0
page_fault+0x22/0x30
system_call_fastpath+0x1a/0x1f
Signed-off-by: Mikulas Patocka <mikulas@xxxxxxxxxxxxxxxxxxxxxxxx>
---
fs/hpfs/file.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
Index: linux-3.4.66/fs/hpfs/file.c
===================================================================
--- linux-3.4.66.orig/fs/hpfs/file.c 2013-11-30 01:16:17.000000000 +0100
+++ linux-3.4.66/fs/hpfs/file.c 2013-11-30 01:19:16.000000000 +0100
@@ -116,9 +116,12 @@ static int hpfs_write_begin(struct file
hpfs_get_block,
&hpfs_i(mapping->host)->mmu_private);
if (unlikely(ret)) {
- loff_t isize = mapping->host->i_size;
+ loff_t isize;
+ hpfs_lock(mapping->host->i_sb);
+ isize = mapping->host->i_size;
if (pos + len > isize)
vmtruncate(mapping->host, isize);
+ hpfs_unlock(mapping->host->i_sb);
}
return ret;
--
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