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Consolidate zfs_holey and zfs_access

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The zfs_holey() and zfs_access() functions can be made common
to both FreeBSD and Linux.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Signed-off-by: Matt Macy <mmacy@FreeBSD.org>
Closes #11125
This commit is contained in:
Matthew Macy
2020-10-31 09:40:08 -07:00
committed by Tony Hutter
parent 073f3c7826
commit a909190683
8 changed files with 112 additions and 188 deletions
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module/zfs/zfs_vnops.c
+92
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@@ -74,6 +74,96 @@ zfs_fsync(znode_t *zp, int syncflag, cred_t *cr)
return (0);
}
#if defined(SEEK_HOLE) && defined(SEEK_DATA)
/*
* Lseek support for finding holes (cmd == SEEK_HOLE) and
* data (cmd == SEEK_DATA). "off" is an in/out parameter.
*/
static int
zfs_holey_common(znode_t *zp, ulong_t cmd, loff_t *off)
{
uint64_t noff = (uint64_t)*off; /* new offset */
uint64_t file_sz;
int error;
boolean_t hole;
file_sz = zp->z_size;
if (noff >= file_sz) {
return (SET_ERROR(ENXIO));
}
if (cmd == F_SEEK_HOLE)
hole = B_TRUE;
else
hole = B_FALSE;
error = dmu_offset_next(ZTOZSB(zp)->z_os, zp->z_id, hole, &noff);
if (error == ESRCH)
return (SET_ERROR(ENXIO));
/* file was dirty, so fall back to using generic logic */
if (error == EBUSY) {
if (hole)
*off = file_sz;
return (0);
}
/*
* We could find a hole that begins after the logical end-of-file,
* because dmu_offset_next() only works on whole blocks. If the
* EOF falls mid-block, then indicate that the "virtual hole"
* at the end of the file begins at the logical EOF, rather than
* at the end of the last block.
*/
if (noff > file_sz) {
ASSERT(hole);
noff = file_sz;
}
if (noff < *off)
return (error);
*off = noff;
return (error);
}
int
zfs_holey(znode_t *zp, ulong_t cmd, loff_t *off)
{
zfsvfs_t *zfsvfs = ZTOZSB(zp);
int error;
ZFS_ENTER(zfsvfs);
ZFS_VERIFY_ZP(zp);
error = zfs_holey_common(zp, cmd, off);
ZFS_EXIT(zfsvfs);
return (error);
}
#endif /* SEEK_HOLE && SEEK_DATA */
/*ARGSUSED*/
int
zfs_access(znode_t *zp, int mode, int flag, cred_t *cr)
{
zfsvfs_t *zfsvfs = ZTOZSB(zp);
int error;
ZFS_ENTER(zfsvfs);
ZFS_VERIFY_ZP(zp);
if (flag & V_ACE_MASK)
error = zfs_zaccess(zp, mode, flag, B_FALSE, cr);
else
error = zfs_zaccess_rwx(zp, mode, flag, cr);
ZFS_EXIT(zfsvfs);
return (error);
}
static unsigned long zfs_vnops_read_chunk_size = 1024 * 1024; /* Tunable */
/*
@@ -637,7 +727,9 @@ zfs_setsecattr(znode_t *zp, vsecattr_t *vsecp, int flag, cred_t *cr)
return (error);
}
EXPORT_SYMBOL(zfs_access);
EXPORT_SYMBOL(zfs_fsync);
EXPORT_SYMBOL(zfs_holey);
EXPORT_SYMBOL(zfs_read);
EXPORT_SYMBOL(zfs_write);
EXPORT_SYMBOL(zfs_getsecattr);