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fp->f_offset doesn't need any protection when it isn't accessed.

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This commit is contained in:
Tor Egge 2003-03-26 19:21:12 +00:00
parent 125ee0d161
commit 128a0bb7e9
1 changed files with 4 additions and 2 deletions
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6
sys/kern/vfs_vnops.c
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@ -513,9 +513,11 @@ vn_read(fp, uio, active_cred, flags, td)
* According to McKusick the vn lock is protecting f_offset here.
* Once this field has it's own lock we can acquire this shared.
*/
vn_lock(vp, LK_EXCLUSIVE | LK_NOPAUSE | LK_RETRY, td);
if ((flags & FOF_OFFSET) == 0)
if ((flags & FOF_OFFSET) == 0) {
vn_lock(vp, LK_EXCLUSIVE | LK_NOPAUSE | LK_RETRY, td);
uio->uio_offset = fp->f_offset;
} else
vn_lock(vp, LK_SHARED | LK_NOPAUSE | LK_RETRY, td);
ioflag |= sequential_heuristic(uio, fp);