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Subject[PATCH -V3 3/6] fs/9p: Implement setting posix acl
Date
This patch also update mode bits, as a normal file system.
I am not sure wether we should do that, considering that
a setxattr on the server will again update the ACL/mode value

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
---
fs/9p/acl.c | 74 ++++++++++++++++++++++++++++++++++++++++++++++++++++-
fs/9p/v9fs_vfs.h | 1 +
fs/9p/vfs_inode.c | 2 +-
3 files changed, 75 insertions(+), 2 deletions(-)

diff --git a/fs/9p/acl.c b/fs/9p/acl.c
index 4293b45..cad38bc 100644
--- a/fs/9p/acl.c
+++ b/fs/9p/acl.c
@@ -17,9 +17,11 @@
#include <net/9p/9p.h>
#include <net/9p/client.h>
#include <linux/slab.h>
+#include <linux/sched.h>
#include <linux/posix_acl_xattr.h>
#include "xattr.h"
#include "acl.h"
+#include "v9fs_vfs.h"

static struct posix_acl *__v9fs_get_acl(struct p9_fid *fid, char *name)
{
@@ -119,7 +121,77 @@ static int v9fs_xattr_set_acl(struct dentry *dentry, const char *name,
const void *value, size_t size,
int flags, int type)
{
- return 0;
+ int retval;
+ struct posix_acl *acl;
+ struct inode *inode = dentry->d_inode;
+
+ if (strcmp(name, "") != 0)
+ return -EINVAL;
+ if (S_ISLNK(inode->i_mode))
+ return -EOPNOTSUPP;
+ if (!is_owner_or_cap(inode))
+ return -EPERM;
+ if (value) {
+ /* update the cached acl value */
+ acl = posix_acl_from_xattr(value, size);
+ if (IS_ERR(acl))
+ return PTR_ERR(acl);
+ else if (acl) {
+ retval = posix_acl_valid(acl);
+ if (retval)
+ goto err_out;
+ }
+ } else
+ acl = NULL;
+
+ switch (type) {
+ case ACL_TYPE_ACCESS:
+ name = POSIX_ACL_XATTR_ACCESS;
+ if (acl) {
+ mode_t mode = inode->i_mode;
+ retval = posix_acl_equiv_mode(acl, &mode);
+ if (retval < 0)
+ goto err_out;
+ else {
+ struct iattr iattr;
+ if (retval == 0) {
+ /*
+ * ACL can be represented
+ * by the mode bits. So don't
+ * update ACL.
+ */
+ acl = NULL;
+ value = NULL;
+ size = 0;
+ }
+ /* Updte the mode bits */
+ iattr.ia_mode = ((mode & S_IALLUGO) |
+ (inode->i_mode & ~S_IALLUGO));
+ iattr.ia_valid = ATTR_MODE;
+ /* FIXME should we update ctime ?
+ * What is the following setxattr update the
+ * mode ?
+ */
+ v9fs_vfs_setattr_dotl(dentry, &iattr);
+ }
+ }
+ break;
+ case ACL_TYPE_DEFAULT:
+ name = POSIX_ACL_XATTR_DEFAULT;
+ if (!S_ISDIR(inode->i_mode)) {
+ retval = -EINVAL;
+ goto err_out;
+ }
+ break;
+ default:
+ BUG();
+ }
+ retval = v9fs_xattr_set(dentry, name, value, size, flags);
+ if (!retval)
+ set_cached_acl(inode, type, acl);
+err_out:
+ posix_acl_release(acl);
+ return retval;
}

const struct xattr_handler v9fs_xattr_acl_access_handler = {
diff --git a/fs/9p/v9fs_vfs.h b/fs/9p/v9fs_vfs.h
index 88418c4..0986129 100644
--- a/fs/9p/v9fs_vfs.h
+++ b/fs/9p/v9fs_vfs.h
@@ -64,3 +64,4 @@ int v9fs_uflags2omode(int uflags, int extended);

ssize_t v9fs_file_readn(struct file *, char *, char __user *, u32, u64);
void v9fs_blank_wstat(struct p9_wstat *wstat);
+int v9fs_vfs_setattr_dotl(struct dentry *, struct iattr *);
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index ee0a21a..df5c6fa 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -1242,7 +1242,7 @@ static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
*
*/

-static int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
+int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
{
int retval;
struct v9fs_session_info *v9ses;
--
1.7.0.4


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