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Subject[patch 46/52] fs: icache reduce locking
Signed-off-by: Nick Piggin <npiggin@suse.de>

Index: linux-2.6/fs/fs-writeback.c
===================================================================
--- linux-2.6.orig/fs/fs-writeback.c
+++ linux-2.6/fs/fs-writeback.c
@@ -484,15 +484,17 @@ writeback_single_inode(struct inode *ino
spin_lock(&inode->i_lock);
dirty = inode->i_state & I_DIRTY;
inode->i_state &= ~(I_DIRTY_SYNC | I_DIRTY_DATASYNC);
- spin_unlock(&inode->i_lock);
/* Don't write the inode if only I_DIRTY_PAGES was set */
if (dirty & (I_DIRTY_SYNC | I_DIRTY_DATASYNC)) {
- int err = write_inode(inode, wbc);
+ int err;
+
+ spin_unlock(&inode->i_lock);
+ err = write_inode(inode, wbc);
if (ret == 0)
ret = err;
+ spin_lock(&inode->i_lock);
}

- spin_lock(&inode->i_lock);
spin_lock(&wb_inode_list_lock);
inode->i_state &= ~I_SYNC;
if (!(inode->i_state & (I_FREEING | I_CLEAR))) {
Index: linux-2.6/fs/inode.c
===================================================================
--- linux-2.6.orig/fs/inode.c
+++ linux-2.6/fs/inode.c
@@ -810,12 +810,9 @@ struct inode *new_inode(struct super_blo

inode = alloc_inode(sb);
if (inode) {
- /* XXX: init as locked for speedup */
- spin_lock(&inode->i_lock);
inode->i_ino = last_ino_get();
inode->i_state = 0;
__inode_add_to_lists(sb, NULL, inode);
- spin_unlock(&inode->i_lock);
}
return inode;
}



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