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Illumos 4039 - zfs_rename()/zfs_link() needs stronger test for XDEV

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4039 zfs_rename()/zfs_link() needs stronger test for XDEV
Reviewed by: Gordon Ross <gordon.ross@nexenta.com>
Reviewed by: Kevin Crowe <kevin.crowe@nexenta.com>
Reviewed by: Saso Kiselkov <skiselkov.ml@gmail.com>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Approved by: Dan McDonald <danmcd@nexenta.com>

References:
  https://www.illumos.org/issues/4039
  https://github.com/illumos/illumos-gate/commit/18e6497

Porting notes:
- This check was updated in Linux in a similar fashion early on in
  the port.  Therefore, this patch just reorders the function and
  updates the comment so it flows the same way as the upstream code.

Ported-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #4218
This commit is contained in:
Marcel Telka 2016-01-13 15:35:55 -08:00 committed by Brian Behlendorf
parent 82f6f6e654
commit 812e91a7e3
1 changed files with 14 additions and 5 deletions
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19
module/zfs/zfs_vnops.c
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@ -3207,13 +3207,18 @@ zfs_rename(struct inode *sdip, char *snm, struct inode *tdip, char *tnm,
ZFS_VERIFY_ZP(sdzp);
zilog = zsb->z_log;
tdzp = ITOZ(tdip);
ZFS_VERIFY_ZP(tdzp);
/*
* We check i_sb because snapshots and the ctldir must have different
* super blocks.
*/
if (tdip->i_sb != sdip->i_sb || zfsctl_is_node(tdip)) {
ZFS_EXIT(zsb);
return (SET_ERROR(EXDEV));
}
tdzp = ITOZ(tdip);
ZFS_VERIFY_ZP(tdzp);
if (zsb->z_utf8 && u8_validate(tnm,
strlen(tnm), NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
ZFS_EXIT(zsb);
@ -3751,14 +3756,18 @@ zfs_link(struct inode *tdip, struct inode *sip, char *name, cred_t *cr)
return (SET_ERROR(EPERM));
}
szp = ITOZ(sip);
ZFS_VERIFY_ZP(szp);
/*
* We check i_sb because snapshots and the ctldir must have different
* super blocks.
*/
if (sip->i_sb != tdip->i_sb || zfsctl_is_node(sip)) {
ZFS_EXIT(zsb);
return (SET_ERROR(EXDEV));
}
szp = ITOZ(sip);
ZFS_VERIFY_ZP(szp);
/* Prevent links to .zfs/shares files */
if ((error = sa_lookup(szp->z_sa_hdl, SA_ZPL_PARENT(zsb),