fat: Fix ATTR_RO for directory

[linux-2.6-omap-h63xx.git] / fs / fat / file.c

diff --git a/fs/fat/file.c b/fs/fat/file.c
index 81b15c623803d4ca88385ee09e004811aebe4c83..f06a4e525eceff2b758ba0ff62ebd6e6f2fca9bb 100644 (file)
--- a/fs/fat/file.c
+++ b/fs/fat/file.c
@@ -282,11 +282,18 @@ static int fat_sanitize_mode(const struct msdos_sb_info *sbi,
        /*
         * Of the r and x bits, all (subject to umask) must be present. Of the
         * w bits, either all (subject to umask) or none must be present.
+        *
+        * If fat_mode_can_hold_ro(inode) is false, can't change w bits.
         */
        if ((perm & (S_IRUGO | S_IXUGO)) != (inode->i_mode & (S_IRUGO|S_IXUGO)))
                return -EPERM;
-       if ((perm & S_IWUGO) && ((perm & S_IWUGO) != (S_IWUGO & ~mask)))
-               return -EPERM;
+       if (fat_mode_can_hold_ro(inode)) {
+               if ((perm & S_IWUGO) && ((perm & S_IWUGO) != (S_IWUGO & ~mask)))
+                       return -EPERM;
+       } else {
+               if ((perm & S_IWUGO) != (S_IWUGO & ~mask))
+                       return -EPERM;
+       }
 
        *mode_ptr &= S_IFMT | perm;
 
@@ -316,8 +323,8 @@ int fat_setattr(struct dentry *dentry, struct iattr *attr)
 {
        struct msdos_sb_info *sbi = MSDOS_SB(dentry->d_sb);
        struct inode *inode = dentry->d_inode;
-       int error = 0;
        unsigned int ia_valid;
+       int error;
 
        /*
         * Expand the file. Since inode_setattr() updates ->i_size
@@ -371,7 +378,8 @@ int fat_setattr(struct dentry *dentry, struct iattr *attr)
                        attr->ia_valid &= ~ATTR_MODE;
        }
 
-       error = inode_setattr(inode, attr);
+       if (attr->ia_valid)
+               error = inode_setattr(inode, attr);
 out:
        return error;
 }