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Do not hash unlinked inodes

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In zfs_znode_alloc we always hash inodes.  If the
znode is unlinked, we do not need to hash it.  This
fixes the problem where zfs_suspend_fs is doing zrele
(iput) in an async fashion, and zfs_resume_fs unlinked
drain processing will try to hash an inode that could
still be hashed, resulting in a panic.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alan Somers <asomers@gmail.com>
Signed-off-by: Paul Zuchowski <pzuchowski@datto.com>
Closes #9741
Closes #11223
Closes #11648
Closes #12210
This commit is contained in:
Paul Zuchowski 2021-06-11 20:00:33 -04:00 committed by Tony Hutter
parent cd2bb9ca44
commit bd197378e7
1 changed files with 11 additions and 4 deletions
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15
module/os/linux/zfs/zfs_znode.c
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@ -610,17 +610,24 @@ zfs_znode_alloc(zfsvfs_t *zfsvfs, dmu_buf_t *db, int blksz,
* number is already hashed for this super block. This can never
* happen because the inode numbers map 1:1 with the object numbers.
*
* The one exception is rolling back a mounted file system, but in
* this case all the active inode are unhashed during the rollback.
* Exceptions include rolling back a mounted file system, either
* from the zfs rollback or zfs recv command.
*
* Active inodes are unhashed during the rollback, but since zrele
* can happen asynchronously, we can't guarantee they've been
* unhashed. This can cause hash collisions in unlinked drain
* processing so do not hash unlinked znodes.
*/
VERIFY3S(insert_inode_locked(ip), ==, 0);
if (links > 0)
VERIFY3S(insert_inode_locked(ip), ==, 0);
mutex_enter(&zfsvfs->z_znodes_lock);
list_insert_tail(&zfsvfs->z_all_znodes, zp);
zfsvfs->z_nr_znodes++;
mutex_exit(&zfsvfs->z_znodes_lock);
unlock_new_inode(ip);
if (links > 0)
unlock_new_inode(ip);
return (zp);
error: