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| author | J. Bruce Fields <bfields@redhat.com> | 2011-09-21 10:58:13 -0400 |
|---|---|---|
| committer | root <root@serles.lst.de> | 2011-10-28 14:59:00 +0200 |
| commit | f3c7691e8d30d88899b514675c7c86d19057b5fd (patch) | |
| tree | 0065bcc05b19a99d8785ce523f992a48fe573e79 /fs/namei.c | |
| parent | 79835a710d6ff811659c8de46f89c7577c3b8cc6 (diff) | |
| download | lwn-f3c7691e8d30d88899b514675c7c86d19057b5fd.tar.gz lwn-f3c7691e8d30d88899b514675c7c86d19057b5fd.zip | |
leases: fix write-open/read-lease race
In setlease, we use i_writecount to decide whether we can give out a
read lease.
In open, we break leases before incrementing i_writecount.
There is therefore a window between the break lease and the i_writecount
increment when setlease could add a new read lease.
This would leave us with a simultaneous write open and read lease, which
shouldn't happen.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'fs/namei.c')
| -rw-r--r-- | fs/namei.c | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/fs/namei.c b/fs/namei.c index 9061157e39d6..7657be4352bf 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -2035,10 +2035,7 @@ static int may_open(struct path *path, int acc_mode, int flag) if (flag & O_NOATIME && !inode_owner_or_capable(inode)) return -EPERM; - /* - * Ensure there are no outstanding leases on the file. - */ - return break_lease(inode, flag); + return 0; } static int handle_truncate(struct file *filp) |