diff options
author | Jan Kara <jack@suse.cz> | 2008-07-12 03:27:31 +0400 |
---|---|---|
committer | Theodore Ts'o <tytso@mit.edu> | 2008-07-12 03:27:31 +0400 |
commit | c7d206b3379f7d6462e778b74f475c470ee3dcaf (patch) | |
tree | 71d11797c72e2e4ee04e6690c048fd26f25ae90d /fs | |
parent | 2e9ee850355593e311d9a26542290fe51e152f74 (diff) | |
download | linux-c7d206b3379f7d6462e778b74f475c470ee3dcaf.tar.xz |
vfs: Move mark_inode_dirty() from under page lock in generic_write_end()
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>
Diffstat (limited to 'fs')
-rw-r--r-- | fs/buffer.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/fs/buffer.c b/fs/buffer.c index 0f51c0f7c266..f4b033237a02 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -2061,6 +2061,7 @@ int generic_write_end(struct file *file, struct address_space *mapping, struct page *page, void *fsdata) { struct inode *inode = mapping->host; + int i_size_changed = 0; 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) { i_size_write(inode, pos+copied); - mark_inode_dirty(inode); + i_size_changed = 1; } unlock_page(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; } EXPORT_SYMBOL(generic_write_end); |