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xfs: invalidate cached acl if set via ioctl

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Setting or removing the "SGI_ACL_[FILE|DEFAULT]" attributes via the
XFS_IOC_ATTRMULTI_BY_HANDLE ioctl completely bypasses the POSIX ACL
infrastructure, like setting the "trusted.SGI_ACL_[FILE|DEFAULT]" xattrs
did until commit 6caa1056.  Similar to that commit, invalidate cached
acls when setting/removing them via the ioctl as well.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Andreas Gruenbacher
2015-11-03 12:56:17 +11:00
committed by Dave Chinner
parent 09cb22d2a5
commit 47e1bf6405
3 changed files with 36 additions and 15 deletions
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38
fs/xfs/xfs_xattr.c
View File

@@ -53,6 +53,28 @@ xfs_xattr_get(struct dentry *dentry, const char *name,
return asize;
}
void
xfs_forget_acl(
struct inode *inode,
const char *name,
int xflags)
{
/*
* Invalidate any cached ACLs if the user has bypassed the ACL
* interface. We don't validate the content whatsoever so it is caller
* responsibility to provide data in valid format and ensure i_mode is
* consistent.
*/
if (xflags & ATTR_ROOT) {
#ifdef CONFIG_XFS_POSIX_ACL
if (!strcmp(name, SGI_ACL_FILE))
forget_cached_acl(inode, ACL_TYPE_ACCESS);
else if (!strcmp(name, SGI_ACL_DEFAULT))
forget_cached_acl(inode, ACL_TYPE_DEFAULT);
#endif
}
}
static int
xfs_xattr_set(struct dentry *dentry, const char *name, const void *value,
size_t size, int flags, int xflags)
@@ -73,20 +95,8 @@ xfs_xattr_set(struct dentry *dentry, const char *name, const void *value,
return xfs_attr_remove(ip, (unsigned char *)name, xflags);
error = xfs_attr_set(ip, (unsigned char *)name,
(void *)value, size, xflags);
/*
* Invalidate any cached ACLs if the user has bypassed the ACL
* interface. We don't validate the content whatsoever so it is caller
* responsibility to provide data in valid format and ensure i_mode is
* consistent.
*/
#ifdef CONFIG_XFS_POSIX_ACL
if (!error && (xflags & ATTR_ROOT)) {
if (!strcmp(name, SGI_ACL_FILE))
forget_cached_acl(VFS_I(ip), ACL_TYPE_ACCESS);
else if (!strcmp(name, SGI_ACL_DEFAULT))
forget_cached_acl(VFS_I(ip), ACL_TYPE_DEFAULT);
}
#endif
if (!error)
xfs_forget_acl(d_inode(dentry), name, xflags);
return error;
}