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zfs_file: implement zfs_file_deallocate for FreeBSD 14

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FreeBSD 14 gained a `VOP_DEALLOCATE` VFS operation and a `fspacectl`
syscall to use it. At minimum, these zero the given region, and if the
underlying filesystem supports it, can make the region sparse. We can
use this to get TRIM-like behaviour for file vdevs.

Sponsored-by: https://despairlabs.com/sponsor/
Reviewed by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Tino Reichardt <milky-zfs@mcmilk.de>
Signed-off-by: Rob Norris <robn@despairlabs.com>
Closes #16496
This commit is contained in:
Rob Norris
2024-09-01 12:34:17 +10:00
committed by Brian Behlendorf
parent fa330646b9
commit f245541e24
2 changed files with 19 additions and 1 deletions
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module/os/freebsd/zfs/zfs_file_os.c
+13 -1
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@@ -295,8 +295,20 @@ zfs_file_fsync(zfs_file_t *fp, int flags)
int
zfs_file_deallocate(zfs_file_t *fp, loff_t offset, loff_t len)
{
int rc;
#if __FreeBSD_version >= 1400029
struct thread *td;
td = curthread;
rc = fo_fspacectl(fp, SPACECTL_DEALLOC, &offset, &len, 0,
td->td_ucred, td);
#else
(void) fp, (void) offset, (void) len;
return (SET_ERROR(EOPNOTSUPP));
rc = EOPNOTSUPP;
#endif
if (rc)
return (SET_ERROR(rc));
return (0);
}
zfs_file_t *