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Intentionally allow ZFS_READONLY in zfs_write

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ZFS_READONLY represents the "DOS R/O" attribute.
When that flag is set, we should behave as if write access
were not granted by anything in the ACL.  In particular:
We _must_ allow writes after opening the file r/w, then
setting the DOS R/O attribute, and writing some more.
(Similar to how you can write after fchmod(fd, 0444).)

Restore these semantics which were lost on FreeBSD when refactoring
zfs_write.  To my knowledge Linux does not actually expose this flag,
but we'll need it to eventually so I've added the supporting checks.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ryan Moeller <ryan@iXsystems.com>
Closes #11693
This commit is contained in:
Ryan Moeller
2021-03-07 12:31:52 -05:00
committed by Brian Behlendorf
parent df8271301e
commit cda6fdd500
2 changed files with 25 additions and 7 deletions
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module/zfs/zfs_vnops.c
+4 -2
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@@ -258,9 +258,11 @@ zfs_write(znode_t *zp, uio_t *uio, int ioflag, cred_t *cr)
}
/*
* If immutable or not appending then return EPERM
* If immutable or not appending then return EPERM.
* Intentionally allow ZFS_READONLY through here.
* See zfs_zaccess_common()
*/
if ((zp->z_pflags & (ZFS_IMMUTABLE | ZFS_READONLY)) ||
if ((zp->z_pflags & ZFS_IMMUTABLE) ||
((zp->z_pflags & ZFS_APPENDONLY) && !(ioflag & O_APPEND) &&
(uio->uio_loffset < zp->z_size))) {
ZFS_EXIT(zfsvfs);