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Subject[PATCH] remove __mark_buffer_dirty and related changes

On Thu, 28 Dec 2000, Linus Torvalds wrote:

> I would actually prefer not having the balance_dirty() in
> mark_buffer_dirty() at all, and then just potentially adding an explicit
> balance_dirty to strategic places. There would probably not be that many
> of those strategic places.
>
> As it stands, this is a bit too subtle for my taste, having people who
> sleep without really realizing it, and not necessarily really wanting to
> (not for correctness issues, but for latency issues - that superblock lock
> can be quite nasty)

Linus, here is a patch which:

- removes __mark_buffer_dirty()
- makes mark_buffer_dirty() return the old dirty bit on the buffer
- changes mark_buffer_dirty_inode() to return the value returned by
mark_buffer_dirty
- changes all calls to mark_buffer_dirty_inode() (on ext2) to
balance_dirty() in case the return value of mark_buffer_dirty_inode() is
1.

Juan Quintela is going to send a patch which calls balance_dirty() after
unlocking the superblock lock on various places on ext2 as soon as he
finds time to.

Comments?


diff -Nur linux.orig/fs/block_dev.c linux/fs/block_dev.c
--- linux.orig/fs/block_dev.c Thu Dec 28 17:42:14 2000
+++ linux/fs/block_dev.c Thu Dec 28 17:55:03 2000
@@ -129,7 +129,8 @@
p += chars;
buf += chars;
mark_buffer_uptodate(bh, 1);
- mark_buffer_dirty(bh);
+ if (mark_buffer_dirty(bh))
+ balance_dirty(dev);
if (filp->f_flags & O_SYNC)
bufferlist[buffercount++] = bh;
else
@@ -144,7 +145,6 @@
}
buffercount=0;
}
- balance_dirty(dev);
if (write_error)
break;
}
diff -Nur linux.orig/fs/buffer.c linux/fs/buffer.c
--- linux.orig/fs/buffer.c Thu Dec 28 17:42:14 2000
+++ linux/fs/buffer.c Thu Dec 28 17:49:17 2000
@@ -1078,16 +1078,13 @@

/* atomic version, the user must call balance_dirty() by hand
as soon as it become possible to block */
-void __mark_buffer_dirty(struct buffer_head *bh)
+int mark_buffer_dirty(struct buffer_head *bh)
{
- if (!atomic_set_buffer_dirty(bh))
+ if (!atomic_set_buffer_dirty(bh)) {
__mark_dirty(bh);
-}
-
-void mark_buffer_dirty(struct buffer_head *bh)
-{
- __mark_buffer_dirty(bh);
- balance_dirty(bh->b_dev);
+ return 1;
+ }
+ return 0;
}

/*
@@ -1851,7 +1848,7 @@
struct inode *inode = (struct inode *)mapping->host;
struct page *page;
struct buffer_head *bh;
- int err;
+ int err, need_balance = 0;

blocksize = inode->i_sb->s_blocksize;
length = offset & (blocksize - 1);
@@ -1908,12 +1905,14 @@
flush_dcache_page(page);
kunmap(page);

- mark_buffer_dirty(bh);
+ need_balance = mark_buffer_dirty(bh);
err = 0;

unlock:
UnlockPage(page);
page_cache_release(page);
+ if (need_balance)
+ balance_dirty(bh->b_dev);
out:
return err;
}
diff -Nur linux.orig/fs/ext2/inode.c linux/fs/ext2/inode.c
--- linux.orig/fs/ext2/inode.c Thu Dec 28 17:42:14 2000
+++ linux/fs/ext2/inode.c Thu Dec 28 17:52:49 2000
@@ -404,7 +404,8 @@
branch[n].p = (u32*) bh->b_data + offsets[n];
*branch[n].p = branch[n].key;
mark_buffer_uptodate(bh, 1);
- mark_buffer_dirty_inode(bh, inode);
+ if (mark_buffer_dirty_inode(bh, inode))
+ balance_dirty(bh->b_dev);
if (IS_SYNC(inode) || inode->u.ext2_i.i_osync) {
ll_rw_block (WRITE, 1, &bh);
wait_on_buffer (bh);
@@ -469,7 +470,8 @@

/* had we spliced it onto indirect block? */
if (where->bh) {
- mark_buffer_dirty_inode(where->bh, inode);
+ if (mark_buffer_dirty_inode(where->bh, inode))
+ balance_dirty(where->bh->b_dev);
if (IS_SYNC(inode) || inode->u.ext2_i.i_osync) {
ll_rw_block (WRITE, 1, &where->bh);
wait_on_buffer(where->bh);
@@ -591,7 +593,8 @@
wait_on_buffer(bh);
memset(bh->b_data, 0, inode->i_sb->s_blocksize);
mark_buffer_uptodate(bh, 1);
- mark_buffer_dirty_inode(bh, inode);
+ if (mark_buffer_dirty_inode(bh, inode))
+ balance_dirty(bh->b_dev);
}
return bh;
}
@@ -907,7 +910,8 @@
if (partial == chain)
mark_inode_dirty(inode);
else
- mark_buffer_dirty_inode(partial->bh, inode);
+ if (mark_buffer_dirty_inode(partial->bh, inode))
+ balance_dirty(partial->bh->b_dev);
ext2_free_branches(inode, &nr, &nr+1, (chain+n-1) - partial);
}
/* Clear the ends of indirect blocks on the shared branch */
@@ -916,7 +920,8 @@
partial->p + 1,
(u32*)partial->bh->b_data + addr_per_block,
(chain+n-1) - partial);
- mark_buffer_dirty_inode(partial->bh, inode);
+ if (mark_buffer_dirty_inode(partial->bh, inode))
+ balance_dirty(partial->bh->b_dev);
if (IS_SYNC(inode)) {
ll_rw_block (WRITE, 1, &partial->bh);
wait_on_buffer (partial->bh);
@@ -1208,7 +1213,8 @@
raw_inode->i_block[0] = cpu_to_le32(kdev_t_to_nr(inode->i_rdev));
else for (block = 0; block < EXT2_N_BLOCKS; block++)
raw_inode->i_block[block] = inode->u.ext2_i.i_data[block];
- mark_buffer_dirty(bh);
+ if (mark_buffer_dirty(bh))
+ balance_dirty(bh->b_dev);
if (do_sync) {
ll_rw_block (WRITE, 1, &bh);
wait_on_buffer (bh);
diff -Nur linux.orig/fs/ext2/namei.c linux/fs/ext2/namei.c
--- linux.orig/fs/ext2/namei.c Thu Dec 28 17:42:14 2000
+++ linux/fs/ext2/namei.c Thu Dec 28 17:54:11 2000
@@ -296,7 +296,8 @@
dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
mark_inode_dirty(dir);
dir->i_version = ++event;
- mark_buffer_dirty_inode(bh, dir);
+ if (mark_buffer_dirty_inode(bh, dir))
+ balance_dirty(bh->b_dev);
if (IS_SYNC(dir)) {
ll_rw_block (WRITE, 1, &bh);
wait_on_buffer (bh);
@@ -337,7 +338,8 @@
else
de->inode = 0;
dir->i_version = ++event;
- mark_buffer_dirty_inode(bh, dir);
+ if (mark_buffer_dirty_inode(bh, dir))
+ balance_dirty(bh->b_dev);
if (IS_SYNC(dir)) {
ll_rw_block (WRITE, 1, &bh);
wait_on_buffer (bh);
@@ -447,7 +449,8 @@
strcpy (de->name, "..");
ext2_set_de_type(dir->i_sb, de, S_IFDIR);
inode->i_nlink = 2;
- mark_buffer_dirty_inode(dir_block, dir);
+ if (mark_buffer_dirty_inode(dir_block, dir))
+ balance_dirty(dir_block->b_dev);
brelse (dir_block);
inode->i_mode = S_IFDIR | mode;
if (dir->i_mode & S_ISGID)
@@ -755,7 +758,8 @@
EXT2_FEATURE_INCOMPAT_FILETYPE))
new_de->file_type = old_de->file_type;
new_dir->i_version = ++event;
- mark_buffer_dirty_inode(new_bh, new_dir);
+ if (mark_buffer_dirty_inode(new_bh, new_dir))
+ balance_dirty(new_bh->b_dev);
if (IS_SYNC(new_dir)) {
ll_rw_block (WRITE, 1, &new_bh);
wait_on_buffer (new_bh);
@@ -786,7 +790,8 @@
mark_inode_dirty(old_dir);
if (dir_bh) {
PARENT_INO(dir_bh->b_data) = le32_to_cpu(new_dir->i_ino);
- mark_buffer_dirty_inode(dir_bh, old_inode);
+ if (mark_buffer_dirty_inode(dir_bh, old_inode))
+ balance_dirty(dir_bh->b_dev);
old_dir->i_nlink--;
mark_inode_dirty(old_dir);
if (new_inode) {
diff -Nur linux.orig/include/linux/fs.h linux/include/linux/fs.h
--- linux.orig/include/linux/fs.h Thu Dec 28 17:42:18 2000
+++ linux/include/linux/fs.h Thu Dec 28 17:49:46 2000
@@ -1019,8 +1019,7 @@
__mark_buffer_protected(bh);
}

-extern void FASTCALL(__mark_buffer_dirty(struct buffer_head *bh));
-extern void FASTCALL(mark_buffer_dirty(struct buffer_head *bh));
+extern int FASTCALL(mark_buffer_dirty(struct buffer_head *bh));

#define atomic_set_buffer_dirty(bh) test_and_set_bit(BH_Dirty, &(bh)->b_state)

@@ -1040,10 +1039,11 @@
}

extern void buffer_insert_inode_queue(struct buffer_head *, struct inode *);
-static inline void mark_buffer_dirty_inode(struct buffer_head *bh, struct inode *inode)
+static inline int mark_buffer_dirty_inode(struct buffer_head *bh, struct inode *inode)
{
- mark_buffer_dirty(bh);
+ int ret = mark_buffer_dirty(bh);
buffer_insert_inode_queue(bh, inode);
+ return ret;
}

extern void balance_dirty(kdev_t);
--- linux.orig/kernel/ksyms.c Thu Dec 28 17:42:17 2000
+++ linux/kernel/ksyms.c Thu Dec 28 18:14:44 2000
@@ -159,7 +159,6 @@
EXPORT_SYMBOL(d_lookup);
EXPORT_SYMBOL(__d_path);
EXPORT_SYMBOL(mark_buffer_dirty);
-EXPORT_SYMBOL(__mark_buffer_dirty);
EXPORT_SYMBOL(__mark_inode_dirty);
EXPORT_SYMBOL(get_empty_filp);
EXPORT_SYMBOL(init_private_file);
-
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