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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/os/linux/kernel/linux/vfs_compat.h
+13
View File
@@ -324,6 +324,19 @@ static inline void zfs_gid_write(struct inode *ip, gid_t gid)
ip->i_gid = make_kgid(kcred->user_ns, gid);
}
/*
* 3.15 API change
*/
#ifndef RENAME_NOREPLACE
#define RENAME_NOREPLACE (1 << 0) /* Don't overwrite target */
#endif
#ifndef RENAME_EXCHANGE
#define RENAME_EXCHANGE (1 << 1) /* Exchange source and dest */
#endif
#ifndef RENAME_WHITEOUT
#define RENAME_WHITEOUT (1 << 2) /* Whiteout source */
#endif
/*
* 4.9 API change
*/