udf: Fix unalloc space handling in udf_update_inode

Writing of inode holding unallocated space info was broken because we first
cleared the buffer and after that checked whether it contains a tag meaning the
block holds unallocated space information.  Fix the problem by checking
appropriate in memory flag instead.

Also cleanup the function a bit along the way - most importantly lock buffer
when modifying its contents, check for buffer_write_io_error instead of
!buffer_uptodate, etc..

Signed-off-by: Jan Kara <jack@suse.cz>

diff --git a/fs/udf/inode.c b/fs/udf/inode.c
index b57ab04..a792a88 100644 (file)
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -1412,16 +1412,16 @@ static int udf_update_inode(struct inode *inode, int do_sync)
                        udf_get_lb_pblock(inode->i_sb,
                                          &iinfo->i_location, 0));
        if (!bh) {
-               udf_debug("bread failure\n");
-               return -EIO;
+               udf_debug("getblk failure\n");
+               return -ENOMEM;
        }
 
-       memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
-
+       lock_buffer(bh);
+       memset(bh->b_data, 0, inode->i_sb->s_blocksize);
        fe = (struct fileEntry *)bh->b_data;
        efe = (struct extendedFileEntry *)bh->b_data;
 
-       if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
+       if (iinfo->i_use) {
                struct unallocSpaceEntry *use =
                        (struct unallocSpaceEntry *)bh->b_data;
 
@@ -1429,20 +1429,18 @@ static int udf_update_inode(struct inode *inode, int do_sync)
                memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
                       iinfo->i_ext.i_data, inode->i_sb->s_blocksize -
                                        sizeof(struct unallocSpaceEntry));
+               use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
+               use->descTag.tagLocation =
+                               cpu_to_le32(iinfo->i_location.logicalBlockNum);
                crclen = sizeof(struct unallocSpaceEntry) +
                                iinfo->i_lenAlloc - sizeof(struct tag);
-               use->descTag.tagLocation = cpu_to_le32(
-                                               iinfo->i_location.
-                                                       logicalBlockNum);
                use->descTag.descCRCLength = cpu_to_le16(crclen);
                use->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)use +
                                                           sizeof(struct tag),
                                                           crclen));
                use->descTag.tagChecksum = udf_tag_checksum(&use->descTag);
 
-               mark_buffer_dirty(bh);
-               brelse(bh);
-               return err;
+               goto out;
        }
 
        if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
@@ -1597,18 +1595,20 @@ static int udf_update_inode(struct inode *inode, int do_sync)
        fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
        fe->descTag.tagLocation = cpu_to_le32(
                                        iinfo->i_location.logicalBlockNum);
-       crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc -
-                                                               sizeof(struct tag);
+       crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
        fe->descTag.descCRCLength = cpu_to_le16(crclen);
        fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
                                                  crclen));
        fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
 
+out:
+       unlock_buffer(bh);
+
        /* write the data blocks */
        mark_buffer_dirty(bh);
        if (do_sync) {
                sync_dirty_buffer(bh);
-               if (buffer_req(bh) && !buffer_uptodate(bh)) {
+               if (buffer_write_io_error(bh)) {
                        printk(KERN_WARNING "IO error syncing udf inode "
                                "[%s:%08lx]\n", inode->i_sb->s_id,
                                inode->i_ino);