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Subject[PATCH 09/24] GFS2: Fix lseek after SEEK_DATA, SEEK_HOLE have been added
Date
We need to take the inode's glock whenever the inode's size
is referenced, otherwise it might not be uptodate. Even
though generic_file_llseek_unlocked() doesn't implement
SEEK_DATA, SEEK_HOLE directly, it does reference the inode's
size in those cases, so we need to add them to the list
of origins which need the glock.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>

diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
index 4416a1c..d717b72 100644
--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -59,15 +59,24 @@ static loff_t gfs2_llseek(struct file *file, loff_t offset, int origin)
struct gfs2_holder i_gh;
loff_t error;

- if (origin == 2) {
+ switch (origin) {
+ case SEEK_END: /* These reference inode->i_size */
+ case SEEK_DATA:
+ case SEEK_HOLE:
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
&i_gh);
if (!error) {
error = generic_file_llseek_unlocked(file, offset, origin);
gfs2_glock_dq_uninit(&i_gh);
}
- } else
+ break;
+ case SEEK_CUR:
+ case SEEK_SET:
error = generic_file_llseek_unlocked(file, offset, origin);
+ break;
+ default:
+ error = -EINVAL;
+ }

return error;
}
--
1.7.4.4


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