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zfs_rename: restructure to have cleaner fallbacks

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This is in preparation for RENAME_EXCHANGE and RENAME_WHITEOUT support
for ZoL, but the changes here allow for far nicer fallbacks than the
previous implementation (the source and target are re-linked in case of
the final link failing).

In addition, a small cleanup was done for the "target exists but is a
different type" codepath so that it's more understandable.

Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>
Closes #12209
Closes #14070
This commit is contained in:
Aleksa Sarai
2019-04-26 23:23:07 +10:00
committed by Brian Behlendorf
parent 7b3ba29654
commit e015d6cc0b
3 changed files with 140 additions and 77 deletions
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include/os/linux/zfs/sys/zfs_dir.h
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@@ -52,6 +52,7 @@ extern "C" {
extern int zfs_dirent_lock(zfs_dirlock_t **, znode_t *, char *, znode_t **,
int, int *, pathname_t *);
extern void zfs_dirent_unlock(zfs_dirlock_t *);
extern int zfs_drop_nlink(znode_t *, dmu_tx_t *, boolean_t *);
extern int zfs_link_create(zfs_dirlock_t *, znode_t *, dmu_tx_t *, int);
extern int zfs_link_destroy(zfs_dirlock_t *, znode_t *, dmu_tx_t *, int,
boolean_t *);