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ceph: fix SEEK_CUR, SEEK_SET regression

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Commit 06222e491e got the if wrong so that
it always evaluates as true.  This is semantically harmless, but makes
SEEK_CUR and SEEK_SET needlessly query the server.

Rewrite the if to explicitly enumerate the cases we DO need a valid i_size
to make this code less fragile.

Reported-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: Sage Weil <sage@newdream.net>
This commit is contained in:
Sage Weil 2011-12-13 09:19:26 -08:00
parent f1932fc1a6
commit 6a82c47aa8
1 changed files with 2 additions and 1 deletions
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3
fs/ceph/file.c
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@ -797,7 +797,8 @@ static loff_t ceph_llseek(struct file *file, loff_t offset, int origin)
mutex_lock(&inode->i_mutex); mutex_lock(&inode->i_mutex);
__ceph_do_pending_vmtruncate(inode); __ceph_do_pending_vmtruncate(inode);
if (origin != SEEK_CUR || origin != SEEK_SET) {
if (origin == SEEK_END || origin == SEEK_DATA || origin == SEEK_HOLE) {
ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE); ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE);
if (ret < 0) { if (ret < 0) {
offset = ret; offset = ret;