diff options
| author | Matthew Macy <[email protected]> | 2019-12-16 09:49:05 -0800 |
|---|---|---|
| committer | Brian Behlendorf <[email protected]> | 2019-12-16 09:49:05 -0800 |
| commit | ba434b18ec6bcedb9d9eb39fa234fbba55032381 (patch) | |
| tree | a51ec94689c201e0ca18c6c45d8090d081a8ad90 /module/zfs | |
| parent | ddb4e69db5eb0ed741dc4e32714af3e0f054086c (diff) | |
Fix zfs_xattr_owner_unlinked on FreeBSD and comment
Explain FreeBSD VFS' unfortunate idiosyncratic locking requirements.
There is no functional change for other platforms.
Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: Matt Macy <[email protected]>
Closes #9720
Diffstat (limited to 'module/zfs')
| -rw-r--r-- | module/zfs/zfs_log.c | 8 | ||||
| -rw-r--r-- | module/zfs/zfs_replay.c | 10 |
2 files changed, 18 insertions, 0 deletions
diff --git a/module/zfs/zfs_log.c b/module/zfs/zfs_log.c index 21296c76e..cfb2f3be2 100644 --- a/module/zfs/zfs_log.c +++ b/module/zfs/zfs_log.c @@ -232,7 +232,13 @@ zfs_xattr_owner_unlinked(znode_t *zp) int unlinked = 0; znode_t *dzp; + /* + * zrele drops the vnode lock which violates the VOP locking contract + * on FreeBSD. See comment at the top of zfs_replay.c for more detail. + */ +#ifndef __FreeBSD__ zhold(zp); +#endif /* * if zp is XATTR node, keep walking up via z_xattr_parent until we * get the owner @@ -247,7 +253,9 @@ zfs_xattr_owner_unlinked(znode_t *zp) zp = dzp; unlinked = zp->z_unlinked; } +#ifndef __FreeBSD__ zrele(zp); +#endif return (unlinked); } diff --git a/module/zfs/zfs_replay.c b/module/zfs/zfs_replay.c index 59a219983..6372c004a 100644 --- a/module/zfs/zfs_replay.c +++ b/module/zfs/zfs_replay.c @@ -49,6 +49,16 @@ #include <sys/zpl.h> /* + * NB: FreeBSD expects to be able to do vnode locking in lookup and + * hold the locks across all subsequent VOPs until vput is called. + * This means that its zfs vnops routines can't do any internal locking. + * In order to have the same contract as the Linux vnops there would + * needed to be duplicate locked vnops. If the vnops were used more widely + * in common code this would likely be preferable. However, currently + * this is the only file where this is the case. + */ + +/* * Functions to replay ZFS intent log (ZIL) records * The functions are called through a function vector (zfs_replay_vector) * which is indexed by the transaction type. |