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Remove checks for mandatory locks 

The Linux VFS handles mandatory locks generically so we shouldn't
need to check for conflicting locks in zfs_read(), zfs_write(), or
zfs_freesp().  Linux 3.18 removed the lock_may_read() and
lock_may_write() interfaces which we were relying on for this
purpose.  Rather than emulating those interfaces we remove the
redundant checks.

Signed-off-by: Ned Bass <bass6@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #2804
This commit is contained in:
Ned Bass 2014-10-16 13:52:56 -07:00 committed by Brian Behlendorf
parent 88904bb3e3
commit bc151f7b31
2 changed files with 0 additions and 28 deletions
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18
module/zfs/zfs_vnops.c
View File

@ -473,15 +473,6 @@ zfs_read(struct inode *ip, uio_t *uio, int ioflag, cred_t *cr)
return (0);
}
/*
* Check for mandatory locks
*/
if (mandatory_lock(ip) &&
!lock_may_read(ip, uio->uio_loffset, uio->uio_resid)) {
ZFS_EXIT(zsb);
return (SET_ERROR(EAGAIN));
}
/*
* If we're in FRSYNC mode, sync out this znode before reading it.
*/
@ -650,15 +641,6 @@ zfs_write(struct inode *ip, uio_t *uio, int ioflag, cred_t *cr)
return (SET_ERROR(EINVAL));
}
/*
* Check for mandatory locks before calling zfs_range_lock()
* in order to prevent a deadlock with locks set via fcntl().
*/
if (mandatory_lock(ip) && !lock_may_write(ip, woff, n)) {
ZFS_EXIT(zsb);
return (SET_ERROR(EAGAIN));
}
/*
* Pre-fault the pages to ensure slow (eg NFS) pages
* don't hold up txg.

10
module/zfs/zfs_znode.c
View File

@ -1546,7 +1546,6 @@ zfs_trunc(znode_t *zp, uint64_t end)
int
zfs_freesp(znode_t *zp, uint64_t off, uint64_t len, int flag, boolean_t log)
{
struct inode *ip = ZTOI(zp);
dmu_tx_t *tx;
zfs_sb_t *zsb = ZTOZSB(zp);
zilog_t *zilog = zsb->z_log;
@ -1567,15 +1566,6 @@ zfs_freesp(znode_t *zp, uint64_t off, uint64_t len, int flag, boolean_t log)
goto out;
}
/*
* Check for any locks in the region to be freed.
*/
if (ip->i_flock && mandatory_lock(ip)) {
uint64_t length = (len ? len : zp->z_size - off);
if (!lock_may_write(ip, off, length))
return (SET_ERROR(EAGAIN));
}
if (len == 0) {
error = zfs_trunc(zp, off);
} else {