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authorJan Kara <jack@suse.cz>2012-05-03 14:47:59 +0200
committerFengguang Wu <fengguang.wu@intel.com>2012-05-06 07:43:39 +0200
commitf0d07b7ffde758a27a48509ceda9a9ef413e0ea0 (patch)
treecb02c3a9e662cca039f7093b69f62b4e0838c98f
parentwriteback: Separate inode requeueing after writeback (diff)
downloadlinux-f0d07b7ffde758a27a48509ceda9a9ef413e0ea0.tar.xz
linux-f0d07b7ffde758a27a48509ceda9a9ef413e0ea0.zip
writeback: Remove wb->list_lock from writeback_single_inode()
writeback_single_inode() doesn't need wb->list_lock for anything on entry now. So remove the requirement. This makes locking of writeback_single_inode() temporarily awkward (entering with i_lock, returning with i_lock and wb->list_lock) but it will be sanitized in the next patch. Also inode_wait_for_writeback() doesn't need wb->list_lock for anything. It was just taking it to make usage convenient for callers but with writeback_single_inode() changing it's not very convenient anymore. So remove the lock from that function. Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
-rw-r--r--fs/fs-writeback.c17
1 files changed, 7 insertions, 10 deletions
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 5d3de002cb8e..3b87dc80fd30 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -328,8 +328,7 @@ static int write_inode(struct inode *inode, struct writeback_control *wbc)
/*
* Wait for writeback on an inode to complete.
*/
-static void inode_wait_for_writeback(struct inode *inode,
- struct bdi_writeback *wb)
+static void inode_wait_for_writeback(struct inode *inode)
{
DEFINE_WAIT_BIT(wq, &inode->i_state, __I_SYNC);
wait_queue_head_t *wqh;
@@ -337,9 +336,7 @@ static void inode_wait_for_writeback(struct inode *inode,
wqh = bit_waitqueue(&inode->i_state, __I_SYNC);
while (inode->i_state & I_SYNC) {
spin_unlock(&inode->i_lock);
- spin_unlock(&wb->list_lock);
__wait_on_bit(wqh, &wq, inode_wait, TASK_UNINTERRUPTIBLE);
- spin_lock(&wb->list_lock);
spin_lock(&inode->i_lock);
}
}
@@ -418,7 +415,6 @@ writeback_single_inode(struct inode *inode, struct bdi_writeback *wb,
unsigned dirty;
int ret;
- assert_spin_locked(&wb->list_lock);
assert_spin_locked(&inode->i_lock);
if (!atomic_read(&inode->i_count))
@@ -432,7 +428,7 @@ writeback_single_inode(struct inode *inode, struct bdi_writeback *wb,
/*
* It's a data-integrity sync. We must wait.
*/
- inode_wait_for_writeback(inode, wb);
+ inode_wait_for_writeback(inode);
}
BUG_ON(inode->i_state & I_SYNC);
@@ -440,7 +436,6 @@ writeback_single_inode(struct inode *inode, struct bdi_writeback *wb,
/* Set I_SYNC, reset I_DIRTY_PAGES */
inode->i_state |= I_SYNC;
spin_unlock(&inode->i_lock);
- spin_unlock(&wb->list_lock);
ret = do_writepages(mapping, wbc);
@@ -587,6 +582,8 @@ static long writeback_sb_inodes(struct super_block *sb,
trace_writeback_sb_inodes_requeue(inode);
continue;
}
+ spin_unlock(&wb->list_lock);
+
__iget(inode);
write_chunk = writeback_chunk_size(wb->bdi, work);
wbc.nr_to_write = write_chunk;
@@ -803,8 +800,10 @@ static long wb_writeback(struct bdi_writeback *wb,
trace_writeback_wait(wb->bdi, work);
inode = wb_inode(wb->b_more_io.prev);
spin_lock(&inode->i_lock);
- inode_wait_for_writeback(inode, wb);
+ spin_unlock(&wb->list_lock);
+ inode_wait_for_writeback(inode);
spin_unlock(&inode->i_lock);
+ spin_lock(&wb->list_lock);
}
}
spin_unlock(&wb->list_lock);
@@ -1350,7 +1349,6 @@ int write_inode_now(struct inode *inode, int sync)
wbc.nr_to_write = 0;
might_sleep();
- spin_lock(&wb->list_lock);
spin_lock(&inode->i_lock);
ret = writeback_single_inode(inode, wb, &wbc);
spin_unlock(&inode->i_lock);
@@ -1375,7 +1373,6 @@ int sync_inode(struct inode *inode, struct writeback_control *wbc)
struct bdi_writeback *wb = &inode_to_bdi(inode)->wb;
int ret;
- spin_lock(&wb->list_lock);
spin_lock(&inode->i_lock);
ret = writeback_single_inode(inode, wb, wbc);
spin_unlock(&inode->i_lock);