Hello,
attached patch fixes rewriting of a file on a full reiserfs
filesystem. Previously it was impossible to write to a file even if we
needed no empty block. The patch allows rewriting of a file and also
extension of a file upto the end of the last allocated block. The patch
applies fine also against 2.6.12-rc2 kernel.
Honza
--
Jan Kara <[EMAIL PROTECTED]>
SuSE CR Labs
Allow rewriting of a file and extending a file upto the end of the allocated
block on a full filesystem.
From: Chris Mason <[EMAIL PROTECTED]>
Signed-off-by: Jan Kara <[EMAIL PROTECTED]>
diff -rupX /home/jack/.kerndiffexclude linux-2.6.5-SLES9_SP2/fs/reiserfs/file.c
linux-2.6.5-SLES9_SP2-reiserrewrite/fs/reiserfs/file.c
--- linux-2.6.5-SLES9_SP2/fs/reiserfs/file.c 2005-04-13 13:56:08.000000000
+0200
+++ linux-2.6.5-SLES9_SP2-reiserrewrite/fs/reiserfs/file.c 2005-04-14
12:50:33.000000000 +0200
@@ -1303,10 +1303,11 @@ ssize_t reiserfs_file_write( struct file
reiserfs_claim_blocks_to_be_allocated(inode->i_sb, num_pages <<
(PAGE_CACHE_SHIFT - inode->i_blkbits));
reiserfs_write_unlock(inode->i_sb);
- if ( !num_pages ) { /* If we do not have enough space even for */
- res = -ENOSPC; /* single page, return -ENOSPC */
- if ( pos > (inode->i_size & (inode->i_sb->s_blocksize-1)))
- break; // In case we are writing past the file end, break.
+ if ( !num_pages ) { /* If we do not have enough space even for a single
page... */
+ if ( pos > inode->i_size+inode->i_sb->s_blocksize-(pos &
(inode->i_sb->s_blocksize-1))) {
+ res = -ENOSPC;
+ break; // In case we are writing past the end of the last file
block, break.
+ }
// Otherwise we are possibly overwriting the file, so
// let's set write size to be equal or less than blocksize.
// This way we get it correctly for file holes.
