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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/fs/zfs.h
+9
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@@ -1620,6 +1620,15 @@ typedef enum zfs_ioc {
#endif
typedef struct zfs_rewrite_args {
uint64_t off;
uint64_t len;
uint64_t flags;
uint64_t arg;
} zfs_rewrite_args_t;
#define ZFS_IOC_REWRITE _IOW(0x83, 3, zfs_rewrite_args_t)
/*
* ZFS-specific error codes used for returning descriptive errors
* to the userland through zfs ioctls.