cifs: reorganize get_cifs_acl

Thus spake Christoph:

"But this whole set_cifs_acl function is a real mess anyway and needs
some splitting up."

With this change too, it's possible to call acl_to_uid_mode() with a
NULL inode pointer. That (or something close to it) will eventually be
necessary when cifs_get_inode_info is reorganized.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Shirish Pargaonkar <shirishp@us.ibm.com>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

diff --git a/fs/cifs/cifsacl.c b/fs/cifs/cifsacl.c
index 57ecdc8..7f8e6c4 100644 (file)
--- a/fs/cifs/cifsacl.c
+++ b/fs/cifs/cifsacl.c
@@ -552,67 +552,66 @@ static int build_sec_desc(struct cifs_ntsd *pntsd, struct cifs_ntsd *pnntsd,
        return rc;
 }
 
-
-/* Retrieve an ACL from the server */
-static struct cifs_ntsd *get_cifs_acl(u32 *pacllen, struct inode *inode,
-                                      const char *path, const __u16 *pfid)
+static struct cifs_ntsd *get_cifs_acl_by_fid(struct cifs_sb_info *cifs_sb,
+               __u16 fid, u32 *pacllen)
 {
-       struct cifsFileInfo *open_file = NULL;
-       bool unlock_file = false;
-       int xid;
-       int rc = -EIO;
-       __u16 fid;
-       struct super_block *sb;
-       struct cifs_sb_info *cifs_sb;
        struct cifs_ntsd *pntsd = NULL;
+       int xid, rc;
 
-       cFYI(1, ("get mode from ACL for %s", path));
+       xid = GetXid();
+       rc = CIFSSMBGetCIFSACL(xid, cifs_sb->tcon, fid, &pntsd, pacllen);
+       FreeXid(xid);
 
-       if (inode == NULL)
-               return NULL;
 
-       xid = GetXid();
-       if (pfid == NULL)
-               open_file = find_readable_file(CIFS_I(inode));
-       else
-               fid = *pfid;
+       cFYI(1, ("GetCIFSACL rc = %d ACL len %d", rc, *pacllen));
+       return pntsd;
+}
 
-       sb = inode->i_sb;
-       if (sb == NULL) {
-               FreeXid(xid);
-               return NULL;
-       }
-       cifs_sb = CIFS_SB(sb);
+static struct cifs_ntsd *get_cifs_acl_by_path(struct cifs_sb_info *cifs_sb,
+               const char *path, u32 *pacllen)
+{
+       struct cifs_ntsd *pntsd = NULL;
+       int oplock = 0;
+       int xid, rc;
+       __u16 fid;
 
-       if (open_file) {
-               unlock_file = true;
-               fid = open_file->netfid;
-       } else if (pfid == NULL) {
-               int oplock = 0;
-               /* open file */
-               rc = CIFSSMBOpen(xid, cifs_sb->tcon, path, FILE_OPEN,
-                               READ_CONTROL, 0, &fid, &oplock, NULL,
-                               cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
-                                       CIFS_MOUNT_MAP_SPECIAL_CHR);
-               if (rc != 0) {
-                       cERROR(1, ("Unable to open file to get ACL"));
-                       FreeXid(xid);
-                       return NULL;
-               }
+       xid = GetXid();
+
+       rc = CIFSSMBOpen(xid, cifs_sb->tcon, path, FILE_OPEN, READ_CONTROL, 0,
+                        &fid, &oplock, NULL, cifs_sb->local_nls,
+                        cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
+       if (rc) {
+               cERROR(1, ("Unable to open file to get ACL"));
+               goto out;
        }
 
        rc = CIFSSMBGetCIFSACL(xid, cifs_sb->tcon, fid, &pntsd, pacllen);
        cFYI(1, ("GetCIFSACL rc = %d ACL len %d", rc, *pacllen));
-       if (unlock_file == true) /* find_readable_file increments ref count */
-               atomic_dec(&open_file->wrtPending);
-       else if (pfid == NULL) /* if opened above we have to close the handle */
-               CIFSSMBClose(xid, cifs_sb->tcon, fid);
-       /* else handle was passed in by caller */
 
+       CIFSSMBClose(xid, cifs_sb->tcon, fid);
+ out:
        FreeXid(xid);
        return pntsd;
 }
 
+/* Retrieve an ACL from the server */
+static struct cifs_ntsd *get_cifs_acl(struct cifs_sb_info *cifs_sb,
+                                     struct inode *inode, const char *path,
+                                     u32 *pacllen)
+{
+       struct cifs_ntsd *pntsd = NULL;
+       struct cifsFileInfo *open_file = NULL;
+
+       if (inode)
+               open_file = find_readable_file(CIFS_I(inode));
+       if (!open_file)
+               return get_cifs_acl_by_path(cifs_sb, path, pacllen);
+
+       pntsd = get_cifs_acl_by_fid(cifs_sb, open_file->netfid, pacllen);
+       atomic_dec(&open_file->wrtPending);
+       return pntsd;
+}
+
 /* Set an ACL on the server */
 static int set_cifs_acl(struct cifs_ntsd *pnntsd, __u32 acllen,
                                struct inode *inode, const char *path)
@@ -668,14 +667,19 @@ static int set_cifs_acl(struct cifs_ntsd *pnntsd, __u32 acllen,
 }
 
 /* Translate the CIFS ACL (simlar to NTFS ACL) for a file into mode bits */
-void acl_to_uid_mode(struct inode *inode, const char *path, const __u16 *pfid)
+void acl_to_uid_mode(struct cifs_sb_info *cifs_sb, struct inode *inode,
+                    const char *path, const __u16 *pfid)
 {
        struct cifs_ntsd *pntsd = NULL;
        u32 acllen = 0;
        int rc = 0;
 
        cFYI(DBG2, ("converting ACL to mode for %s", path));
-       pntsd = get_cifs_acl(&acllen, inode, path, pfid);
+
+       if (pfid)
+               pntsd = get_cifs_acl_by_fid(cifs_sb, *pfid, &acllen);
+       else
+               pntsd = get_cifs_acl(cifs_sb, inode, path, &acllen);
 
        /* if we can retrieve the ACL, now parse Access Control Entries, ACEs */
        if (pntsd)
@@ -698,7 +702,7 @@ int mode_to_acl(struct inode *inode, const char *path, __u64 nmode)
        cFYI(DBG2, ("set ACL from mode for %s", path));
 
        /* Get the security descriptor */
-       pntsd = get_cifs_acl(&secdesclen, inode, path, NULL);
+       pntsd = get_cifs_acl(CIFS_SB(inode->i_sb), inode, path, &secdesclen);
 
        /* Add three ACEs for owner, group, everyone getting rid of
           other ACEs as chmod disables ACEs and set the security descriptor */

diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index d542cf1..f945232 100644 (file)
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -108,8 +108,8 @@ extern int cifs_get_inode_info(struct inode **pinode,
 extern int cifs_get_inode_info_unix(struct inode **pinode,
                        const unsigned char *search_path,
                        struct super_block *sb, int xid);
-extern void acl_to_uid_mode(struct inode *inode, const char *path,
-                           const __u16 *pfid);
+extern void acl_to_uid_mode(struct cifs_sb_info *cifs_sb, struct inode *inode,
+                           const char *path, const __u16 *pfid);
 extern int mode_to_acl(struct inode *inode, const char *path, __u64);
 
 extern int cifs_mount(struct super_block *, struct cifs_sb_info *, char *,

diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 84b7bea..fad882b 100644 (file)
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -626,7 +626,7 @@ int cifs_get_inode_info(struct inode **pinode,
        /* fill in 0777 bits from ACL */
        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
                cFYI(1, ("Getting mode bits from ACL"));
-               acl_to_uid_mode(inode, full_path, pfid);
+               acl_to_uid_mode(cifs_sb, inode, full_path, pfid);
        }
 #endif
        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {