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| author | David Woodhouse <dwmw2@infradead.org> | 2006-09-24 22:05:59 +0100 |
|---|---|---|
| committer | David Woodhouse <dwmw2@infradead.org> | 2006-09-24 22:05:59 +0100 |
| commit | 02b25fcff676125a88169c8a78d4c6dd647574ed (patch) | |
| tree | 372fc8e885be41ba1819b2767c8889ecd97ff948 /fs/ocfs2/uptodate.c | |
| parent | 1694176a210189312e31b083bac1e1688981219a (diff) | |
| parent | a68aa1cc6f3203b8a332683ebde67a00f39eec43 (diff) | |
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
Diffstat (limited to 'fs/ocfs2/uptodate.c')
| -rw-r--r-- | fs/ocfs2/uptodate.c | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/fs/ocfs2/uptodate.c b/fs/ocfs2/uptodate.c index b8a00a79332..9707ed7a320 100644 --- a/fs/ocfs2/uptodate.c +++ b/fs/ocfs2/uptodate.c @@ -206,7 +206,10 @@ static int ocfs2_buffer_cached(struct ocfs2_inode_info *oi, } /* Warning: even if it returns true, this does *not* guarantee that - * the block is stored in our inode metadata cache. */ + * the block is stored in our inode metadata cache. + * + * This can be called under lock_buffer() + */ int ocfs2_buffer_uptodate(struct inode *inode, struct buffer_head *bh) { @@ -226,6 +229,16 @@ int ocfs2_buffer_uptodate(struct inode *inode, return ocfs2_buffer_cached(OCFS2_I(inode), bh); } +/* + * Determine whether a buffer is currently out on a read-ahead request. + * ip_io_sem should be held to serialize submitters with the logic here. + */ +int ocfs2_buffer_read_ahead(struct inode *inode, + struct buffer_head *bh) +{ + return buffer_locked(bh) && ocfs2_buffer_cached(OCFS2_I(inode), bh); +} + /* Requires ip_lock */ static void ocfs2_append_cache_array(struct ocfs2_caching_info *ci, sector_t block) @@ -403,7 +416,11 @@ out_free: * * Note that this function may actually fail to insert the block if * memory cannot be allocated. This is not fatal however (but may - * result in a performance penalty) */ + * result in a performance penalty) + * + * Readahead buffers can be passed in here before the I/O request is + * completed. + */ void ocfs2_set_buffer_uptodate(struct inode *inode, struct buffer_head *bh) { |