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Introduce zfs rewrite subcommand (#17246)

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This allows to rewrite content of specified file(s) as-is without
modifications, but at a different location, compression, checksum,
dedup, copies and other parameter values.  It is faster than read
plus write, since it does not require data copying to user-space.
It is also faster for sync=always datasets, since without data
modification it does not require ZIL writing.  Also since it is
protected by normal range range locks, it can be done under any
other load.  Also it does not affect file's modification time or
other properties.

Signed-off-by:	Alexander Motin <mav@FreeBSD.org>
Sponsored by:	iXsystems, Inc.
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Rob Norris <robn@despairlabs.com>
This commit is contained in:
Alexander Motin
2025-05-12 13:22:17 -04:00
committed by GitHub
parent 9aae14a14a
commit 49fbdd4533
16 changed files with 636 additions and 5 deletions
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include/sys/zfs_vnops.h
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@@ -40,6 +40,7 @@ extern int zfs_clone_range(znode_t *, uint64_t *, znode_t *, uint64_t *,
uint64_t *, cred_t *);
extern int zfs_clone_range_replay(znode_t *, uint64_t, uint64_t, uint64_t,
const blkptr_t *, size_t);
extern int zfs_rewrite(znode_t *, uint64_t, uint64_t, uint64_t, uint64_t);
extern int zfs_getsecattr(znode_t *, vsecattr_t *, int, cred_t *);
extern int zfs_setsecattr(znode_t *, vsecattr_t *, int, cred_t *);