CIFS: Fix mkdir/rmdir bug for the non-POSIX case
Currently we do inc/drop_nlink for a parent directory for every mkdir/rmdir calls. That's wrong when Unix extensions are disabled because in this case a server doesn't follow the same semantic and returns the old value on the next QueryInfo request. As the result, we update our value with the server one and then decrement it on every rmdir call - go to negative nlink values. Fix this by removing inc/drop_nlink for the parent directory from mkdir/rmdir, setting it for a revalidation and ignoring NumberOfLinks for directories when Unix extensions are disabled. Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru> Reviewed-by: Jeff Layton <jlayton@samba.org> Signed-off-by: Steve French <smfrench@gmail.com>
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@ -534,6 +534,11 @@ cifs_all_info_to_fattr(struct cifs_fattr *fattr, FILE_ALL_INFO *info,
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if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
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fattr->cf_mode = S_IFDIR | cifs_sb->mnt_dir_mode;
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fattr->cf_dtype = DT_DIR;
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/*
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* Server can return wrong NumberOfLinks value for directories
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* when Unix extensions are disabled - fake it.
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*/
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fattr->cf_nlink = 2;
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} else {
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fattr->cf_mode = S_IFREG | cifs_sb->mnt_file_mode;
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fattr->cf_dtype = DT_REG;
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@ -541,9 +546,9 @@ cifs_all_info_to_fattr(struct cifs_fattr *fattr, FILE_ALL_INFO *info,
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/* clear write bits if ATTR_READONLY is set */
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if (fattr->cf_cifsattrs & ATTR_READONLY)
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fattr->cf_mode &= ~(S_IWUGO);
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}
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fattr->cf_nlink = le32_to_cpu(info->NumberOfLinks);
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fattr->cf_nlink = le32_to_cpu(info->NumberOfLinks);
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}
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fattr->cf_uid = cifs_sb->mnt_uid;
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fattr->cf_gid = cifs_sb->mnt_gid;
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@ -1322,7 +1327,6 @@ int cifs_mkdir(struct inode *inode, struct dentry *direntry, umode_t mode)
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}
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/*BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if need
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to set uid/gid */
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inc_nlink(inode);
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cifs_unix_basic_to_fattr(&fattr, pInfo, cifs_sb);
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cifs_fill_uniqueid(inode->i_sb, &fattr);
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@ -1355,7 +1359,6 @@ mkdir_retry_old:
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d_drop(direntry);
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} else {
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mkdir_get_info:
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inc_nlink(inode);
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if (pTcon->unix_ext)
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rc = cifs_get_inode_info_unix(&newinode, full_path,
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inode->i_sb, xid);
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@ -1436,6 +1439,11 @@ mkdir_get_info:
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}
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}
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mkdir_out:
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/*
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* Force revalidate to get parent dir info when needed since cached
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* attributes are invalid now.
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*/
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CIFS_I(inode)->time = 0;
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kfree(full_path);
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FreeXid(xid);
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cifs_put_tlink(tlink);
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@ -1475,7 +1483,6 @@ int cifs_rmdir(struct inode *inode, struct dentry *direntry)
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cifs_put_tlink(tlink);
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if (!rc) {
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drop_nlink(inode);
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spin_lock(&direntry->d_inode->i_lock);
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i_size_write(direntry->d_inode, 0);
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clear_nlink(direntry->d_inode);
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@ -1483,12 +1490,15 @@ int cifs_rmdir(struct inode *inode, struct dentry *direntry)
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}
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cifsInode = CIFS_I(direntry->d_inode);
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cifsInode->time = 0; /* force revalidate to go get info when
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needed */
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/* force revalidate to go get info when needed */
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cifsInode->time = 0;
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cifsInode = CIFS_I(inode);
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cifsInode->time = 0; /* force revalidate to get parent dir info
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since cached search results now invalid */
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/*
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* Force revalidate to get parent dir info when needed since cached
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* attributes are invalid now.
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*/
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cifsInode->time = 0;
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direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
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current_fs_time(inode->i_sb);
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