Fix handling of errors from dmu_write_uio_dbuf() on FreeBSD
FreeBSD's implementation of zfs_uio_fault_move() returns EFAULT when a page fault occurs while copying data in or out of user buffers. The VFS treats such errors specially and will retry the I/O operation (which may have made some partial progress). When the FreeBSD and Linux implementations of zfs_write() were merged, the handling of errors from dmu_write_uio_dbuf() changed such that EFAULT is not handled as a partial write. For example, when appending to a file, the z_size field of the znode is not updated after a partial write resulting in EFAULT. Restore the old handling of errors from dmu_write_uio_dbuf() to fix this. This should have no impact on Linux, which has special handling for EFAULT already. Reviewed-by: Andriy Gapon <avg@FreeBSD.org> Reviewed-by: Ryan Moeller <ryan@iXsystems.com> Signed-off-by: Mark Johnston <markj@FreeBSD.org> Closes #12964
This commit is contained in:
parent
63a26454ba
commit
063daa8350
|
@ -338,7 +338,7 @@ out:
|
||||||
int
|
int
|
||||||
zfs_write(znode_t *zp, zfs_uio_t *uio, int ioflag, cred_t *cr)
|
zfs_write(znode_t *zp, zfs_uio_t *uio, int ioflag, cred_t *cr)
|
||||||
{
|
{
|
||||||
int error = 0;
|
int error = 0, error1;
|
||||||
ssize_t start_resid = zfs_uio_resid(uio);
|
ssize_t start_resid = zfs_uio_resid(uio);
|
||||||
|
|
||||||
/*
|
/*
|
||||||
|
@ -576,7 +576,11 @@ zfs_write(znode_t *zp, zfs_uio_t *uio, int ioflag, cred_t *cr)
|
||||||
continue;
|
continue;
|
||||||
}
|
}
|
||||||
#endif
|
#endif
|
||||||
if (error != 0) {
|
/*
|
||||||
|
* On FreeBSD, EFAULT should be propagated back to the
|
||||||
|
* VFS, which will handle faulting and will retry.
|
||||||
|
*/
|
||||||
|
if (error != 0 && error != EFAULT) {
|
||||||
dmu_tx_commit(tx);
|
dmu_tx_commit(tx);
|
||||||
break;
|
break;
|
||||||
}
|
}
|
||||||
|
@ -660,7 +664,7 @@ zfs_write(znode_t *zp, zfs_uio_t *uio, int ioflag, cred_t *cr)
|
||||||
while ((end_size = zp->z_size) < zfs_uio_offset(uio)) {
|
while ((end_size = zp->z_size) < zfs_uio_offset(uio)) {
|
||||||
(void) atomic_cas_64(&zp->z_size, end_size,
|
(void) atomic_cas_64(&zp->z_size, end_size,
|
||||||
zfs_uio_offset(uio));
|
zfs_uio_offset(uio));
|
||||||
ASSERT(error == 0);
|
ASSERT(error == 0 || error == EFAULT);
|
||||||
}
|
}
|
||||||
/*
|
/*
|
||||||
* If we are replaying and eof is non zero then force
|
* If we are replaying and eof is non zero then force
|
||||||
|
@ -670,7 +674,10 @@ zfs_write(znode_t *zp, zfs_uio_t *uio, int ioflag, cred_t *cr)
|
||||||
if (zfsvfs->z_replay && zfsvfs->z_replay_eof != 0)
|
if (zfsvfs->z_replay && zfsvfs->z_replay_eof != 0)
|
||||||
zp->z_size = zfsvfs->z_replay_eof;
|
zp->z_size = zfsvfs->z_replay_eof;
|
||||||
|
|
||||||
error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
|
error1 = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
|
||||||
|
if (error1 != 0)
|
||||||
|
/* Avoid clobbering EFAULT. */
|
||||||
|
error = error1;
|
||||||
|
|
||||||
zfs_log_write(zilog, tx, TX_WRITE, zp, woff, tx_bytes, ioflag,
|
zfs_log_write(zilog, tx, TX_WRITE, zp, woff, tx_bytes, ioflag,
|
||||||
NULL, NULL);
|
NULL, NULL);
|
||||||
|
|
Loading…
Reference in New Issue