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Add explicit DMU_DIRECTIO checks

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UIO_DIRECT means we can do Direct I/O, while DMU_DIRECTIO we want
to do it.  First does not automatically means second.  Add few
checks to not use Direct I/O in few cases we don't want it.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Signed-off-by:	Alexander Motin <mav@FreeBSD.org>
Sponsored by:	iXsystems, Inc.
Closes #17342
This commit is contained in:
Alexander Motin 2025-05-16 23:27:05 -04:00 committed by GitHub
parent d5616ad34a
commit e55225be3e
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GPG Key ID: B5690EEEBB952194
1 changed files with 5 additions and 3 deletions
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8
module/zfs/dmu.c
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@ -1383,7 +1383,7 @@ dmu_read_uio_dnode(dnode_t *dn, zfs_uio_t *uio, uint64_t size,
dmu_buf_t **dbp; dmu_buf_t **dbp;
int numbufs, i, err; int numbufs, i, err;
if (uio->uio_extflg & UIO_DIRECT) if ((flags & DMU_DIRECTIO) && (uio->uio_extflg & UIO_DIRECT))
return (dmu_read_uio_direct(dn, uio, size, flags)); return (dmu_read_uio_direct(dn, uio, size, flags));
flags &= ~DMU_DIRECTIO; flags &= ~DMU_DIRECTIO;
@ -1489,7 +1489,7 @@ top:
* We only allow Direct I/O writes to happen if we are block * We only allow Direct I/O writes to happen if we are block
* sized aligned. Otherwise, we pass the write off to the ARC. * sized aligned. Otherwise, we pass the write off to the ARC.
*/ */
if ((uio->uio_extflg & UIO_DIRECT) && if ((flags & DMU_DIRECTIO) && (uio->uio_extflg & UIO_DIRECT) &&
(write_size >= dn->dn_datablksz)) { (write_size >= dn->dn_datablksz)) {
if (zfs_dio_aligned(zfs_uio_offset(uio), write_size, if (zfs_dio_aligned(zfs_uio_offset(uio), write_size,
dn->dn_datablksz)) { dn->dn_datablksz)) {
@ -1564,10 +1564,12 @@ top:
dmu_buf_rele_array(dbp, numbufs, FTAG); dmu_buf_rele_array(dbp, numbufs, FTAG);
if ((uio->uio_extflg & UIO_DIRECT) && size > 0) { if ((oflags & DMU_DIRECTIO) && (uio->uio_extflg & UIO_DIRECT) &&
err == 0 && size > 0) {
flags = oflags; flags = oflags;
goto top; goto top;
} }
IMPLY(err == 0, size == 0);
return (err); return (err);
} }