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zfs_rename: support RENAME_* flags

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Implement support for Linux's RENAME_* flags (for renameat2). Aside from
being quite useful for userspace (providing race-free ways to exchange
paths and implement mv --no-clobber), they are used by overlayfs and are
thus required in order to use overlayfs-on-ZFS.

In order for us to represent the new renameat2(2) flags in the ZIL, we
create two new transaction types for the two flags which need
transactional-level support (RENAME_EXCHANGE and RENAME_WHITEOUT).
RENAME_NOREPLACE does not need any ZIL support because we know that if
the operation succeeded before creating the ZIL entry, there was no file
to be clobbered and thus it can be treated as a regular TX_RENAME.

Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Pavel Snajdr <snajpa@snajpa.net>
Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>
Closes #12209
Closes #14070
This commit is contained in:
Aleksa Sarai
2019-06-22 10:35:11 +10:00
committed by Brian Behlendorf
parent e015d6cc0b
commit dbf6108b4d
33 changed files with 932 additions and 74 deletions
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include/sys/zfs_znode.h
+6
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@@ -299,6 +299,12 @@ extern void zfs_log_symlink(zilog_t *zilog, dmu_tx_t *tx, uint64_t txtype,
extern void zfs_log_rename(zilog_t *zilog, dmu_tx_t *tx, uint64_t txtype,
znode_t *sdzp, const char *sname, znode_t *tdzp, const char *dname,
znode_t *szp);
extern void zfs_log_rename_exchange(zilog_t *zilog, dmu_tx_t *tx,
uint64_t txtype, znode_t *sdzp, const char *sname, znode_t *tdzp,
const char *dname, znode_t *szp);
extern void zfs_log_rename_whiteout(zilog_t *zilog, dmu_tx_t *tx,
uint64_t txtype, znode_t *sdzp, const char *sname, znode_t *tdzp,
const char *dname, znode_t *szp, znode_t *wzp);
extern void zfs_log_write(zilog_t *zilog, dmu_tx_t *tx, int txtype,
znode_t *zp, offset_t off, ssize_t len, int ioflag,
zil_callback_t callback, void *callback_data);