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vfs: Move mark_inode_dirty() from under page lock in generic_write_end()

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There's no need to call mark_inode_dirty() under page lock in
generic_write_end(). It unnecessarily makes hold time of page lock longer
and more importantly it forces locking order of page lock and transaction
start for journaling filesystems.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Jan Kara 2008-07-11 19:27:31 -04:00 • committed by Theodore Ts'o
parent 2e9ee85035
commit c7d206b337
1 changed files with 11 additions and 1 deletions
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12
fs/buffer.c
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@ -2061,6 +2061,7 @@ int generic_write_end(struct file *file, struct address_space *mapping,
struct page *page, void *fsdata) struct page *page, void *fsdata)
{ {
struct inode *inode = mapping->host; struct inode *inode = mapping->host;
int i_size_changed = 0;
copied = block_write_end(file, mapping, pos, len, copied, page, fsdata); copied = block_write_end(file, mapping, pos, len, copied, page, fsdata);
@ -2073,12 +2074,21 @@ int generic_write_end(struct file *file, struct address_space *mapping,
*/ */
if (pos+copied > inode->i_size) { if (pos+copied > inode->i_size) {
i_size_write(inode, pos+copied); i_size_write(inode, pos+copied);
mark_inode_dirty(inode); i_size_changed = 1;
} }
unlock_page(page); unlock_page(page);
page_cache_release(page); page_cache_release(page);
/*
* Don't mark the inode dirty under page lock. First, it unnecessarily
* makes the holding time of page lock longer. Second, it forces lock
* ordering of page lock and transaction start for journaling
* filesystems.
*/
if (i_size_changed)
mark_inode_dirty(inode);
return copied; return copied;
} }
EXPORT_SYMBOL(generic_write_end); EXPORT_SYMBOL(generic_write_end);