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ext3: Fix truncation of symlinks after failed write 

Contents of long symlinks is written via standard write methods. So when the
write fails, we add inode to orphan list. But symlinks don't have .truncate
method defined so nobody properly removes them from the orphan list (both on
disk and in memory).

Fix this by calling ext3_truncate() directly instead of calling vmtruncate()
(which is saner anyway since we don't need anything vmtruncate() does except
from calling .truncate in these paths).  We also add inode to orphan list only
if ext3_can_truncate() is true (currently, it can be false for symlinks when
there are no blocks allocated) - otherwise orphan list processing will complain
and ext3_truncate() will not remove inode from on-disk orphan list.

Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara 2009-07-13 20:26:52 +02:00
parent 7447a668a3
commit 9eaaa2d575
1 changed files with 10 additions and 9 deletions
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19
fs/ext3/inode.c
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@ -1193,15 +1193,16 @@ static int ext3_write_begin(struct file *file, struct address_space *mapping,
* i_size_read because we hold i_mutex.
*
* Add inode to orphan list in case we crash before truncate
* finishes.
* finishes. Do this only if ext3_can_truncate() agrees so
* that orphan processing code is happy.
*/
if (pos + len > inode->i_size)
if (pos + len > inode->i_size && ext3_can_truncate(inode))
ext3_orphan_add(handle, inode);
ext3_journal_stop(handle);
unlock_page(page);
page_cache_release(page);
if (pos + len > inode->i_size)
vmtruncate(inode, inode->i_size);
ext3_truncate(inode);
}
if (ret == -ENOSPC && ext3_should_retry_alloc(inode->i_sb, &retries))
goto retry;
@ -1287,7 +1288,7 @@ static int ext3_ordered_write_end(struct file *file,
* There may be allocated blocks outside of i_size because
* we failed to copy some data. Prepare for truncate.
*/
if (pos + len > inode->i_size)
if (pos + len > inode->i_size && ext3_can_truncate(inode))
ext3_orphan_add(handle, inode);
ret2 = ext3_journal_stop(handle);
if (!ret)
@ -1296,7 +1297,7 @@ static int ext3_ordered_write_end(struct file *file,
page_cache_release(page);
if (pos + len > inode->i_size)
vmtruncate(inode, inode->i_size);
ext3_truncate(inode);
return ret ? ret : copied;
}
@ -1315,14 +1316,14 @@ static int ext3_writeback_write_end(struct file *file,
* There may be allocated blocks outside of i_size because
* we failed to copy some data. Prepare for truncate.
*/
if (pos + len > inode->i_size)
if (pos + len > inode->i_size && ext3_can_truncate(inode))
ext3_orphan_add(handle, inode);
ret = ext3_journal_stop(handle);
unlock_page(page);
page_cache_release(page);
if (pos + len > inode->i_size)
vmtruncate(inode, inode->i_size);
ext3_truncate(inode);
return ret ? ret : copied;
}
@ -1358,7 +1359,7 @@ static int ext3_journalled_write_end(struct file *file,
* There may be allocated blocks outside of i_size because
* we failed to copy some data. Prepare for truncate.
*/
if (pos + len > inode->i_size)
if (pos + len > inode->i_size && ext3_can_truncate(inode))
ext3_orphan_add(handle, inode);
EXT3_I(inode)->i_state |= EXT3_STATE_JDATA;
if (inode->i_size > EXT3_I(inode)->i_disksize) {
@ -1375,7 +1376,7 @@ static int ext3_journalled_write_end(struct file *file,
page_cache_release(page);
if (pos + len > inode->i_size)
vmtruncate(inode, inode->i_size);
ext3_truncate(inode);
return ret ? ret : copied;
}