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fs: pull inode->i_lock up out of writeback_single_inode 

First thing we do in writeback_single_inode() is take the i_lock and
the last thing we do is drop it. A caller already holds the i_lock,
so pull the i_lock out of writeback_single_inode() to reduce the
round trips on this lock during inode writeback.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Dave Chinner 2011-03-22 22:23:43 +11:00 committed by Al Viro
parent 67a23c4946
commit 0f1b1fd86f
1 changed files with 11 additions and 7 deletions
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18
fs/fs-writeback.c
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@ -332,9 +332,9 @@ static void inode_wait_for_writeback(struct inode *inode)
}
/*
* Write out an inode's dirty pages. Called under inode_wb_list_lock. Either
* the caller has an active reference on the inode or the inode has I_WILL_FREE
* set.
* Write out an inode's dirty pages. Called under inode_wb_list_lock and
* inode->i_lock. Either the caller has an active reference on the inode or
* the inode has I_WILL_FREE set.
*
* If `wait' is set, wait on the writeout.
*
@ -349,7 +349,9 @@ writeback_single_inode(struct inode *inode, struct writeback_control *wbc)
unsigned dirty;
int ret;
spin_lock(&inode->i_lock);
assert_spin_locked(&inode_wb_list_lock);
assert_spin_locked(&inode->i_lock);
if (!atomic_read(&inode->i_count))
WARN_ON(!(inode->i_state & (I_WILL_FREE|I_FREEING)));
else
@ -365,7 +367,6 @@ writeback_single_inode(struct inode *inode, struct writeback_control *wbc)
* completed a full scan of b_io.
*/
if (wbc->sync_mode != WB_SYNC_ALL) {
spin_unlock(&inode->i_lock);
requeue_io(inode);
return 0;
}
@ -456,7 +457,6 @@ writeback_single_inode(struct inode *inode, struct writeback_control *wbc)
}
}
inode_sync_complete(inode);
spin_unlock(&inode->i_lock);
return ret;
}
@ -544,7 +544,6 @@ static int writeback_sb_inodes(struct super_block *sb, struct bdi_writeback *wb,
}
__iget(inode);
spin_unlock(&inode->i_lock);
pages_skipped = wbc->pages_skipped;
writeback_single_inode(inode, wbc);
@ -555,6 +554,7 @@ static int writeback_sb_inodes(struct super_block *sb, struct bdi_writeback *wb,
*/
redirty_tail(inode);
}
spin_unlock(&inode->i_lock);
spin_unlock(&inode_wb_list_lock);
iput(inode);
cond_resched();
@ -1309,7 +1309,9 @@ int write_inode_now(struct inode *inode, int sync)
might_sleep();
spin_lock(&inode_wb_list_lock);
spin_lock(&inode->i_lock);
ret = writeback_single_inode(inode, &wbc);
spin_unlock(&inode->i_lock);
spin_unlock(&inode_wb_list_lock);
if (sync)
inode_sync_wait(inode);
@ -1333,7 +1335,9 @@ int sync_inode(struct inode *inode, struct writeback_control *wbc)
int ret;
spin_lock(&inode_wb_list_lock);
spin_lock(&inode->i_lock);
ret = writeback_single_inode(inode, wbc);
spin_unlock(&inode->i_lock);
spin_unlock(&inode_wb_list_lock);
return ret;
}