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Date: Mon, 18 Feb 2013 00:33:23 +0800
From: Zheng Liu <gnehzuil.liu@...il.com>
To: linux-ext4@...r.kernel.org
Cc: Zheng Liu <wenqing.lz@...bao.com>, Theodore Ts'o <tytso@....edu>,
Jan kara <jack@...e.cz>
Subject: Re: [PATCH 8/9] ext4: adjust some functions for reclaiming extents
from extent status tree
On Mon, Feb 18, 2013 at 12:27:53AM +0800, Zheng Liu wrote:
> From: Zheng Liu <wenqing.lz@...bao.com>
>
> This commit changes some interfaces in extent status tree because we
> need to use inode to count the cached objects in a extent status tree.
>
> Signed-off-by: Zheng Liu <wenqing.lz@...bao.com>
> Cc: "Theodore Ts'o" <tytso@....edu>
> Cc: Jan kara <jack@...e.cz>
Oops, I forgot to add 'v6' in subject. The patch itself is right.
Regards,
- Zheng
> ---
> fs/ext4/extents_status.c | 50 +++++++++++++++++++++++-------------------------
> 1 file changed, 24 insertions(+), 26 deletions(-)
>
> diff --git a/fs/ext4/extents_status.c b/fs/ext4/extents_status.c
> index 473a935..3021858 100644
> --- a/fs/ext4/extents_status.c
> +++ b/fs/ext4/extents_status.c
> @@ -142,9 +142,8 @@
>
> static struct kmem_cache *ext4_es_cachep;
>
> -static int __es_insert_extent(struct ext4_es_tree *tree,
> - struct extent_status *newes);
> -static int __es_remove_extent(struct ext4_es_tree *tree, ext4_lblk_t lblk,
> +static int __es_insert_extent(struct inode *inode, struct extent_status *newes);
> +static int __es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
> ext4_lblk_t end);
>
> int __init ext4_init_es(void)
> @@ -285,7 +284,8 @@ out:
> }
>
> static struct extent_status *
> -ext4_es_alloc_extent(ext4_lblk_t lblk, ext4_lblk_t len, ext4_fsblk_t pblk)
> +ext4_es_alloc_extent(struct inode *inode, ext4_lblk_t lblk, ext4_lblk_t len,
> + ext4_fsblk_t pblk)
> {
> struct extent_status *es;
> es = kmem_cache_alloc(ext4_es_cachep, GFP_ATOMIC);
> @@ -297,7 +297,7 @@ ext4_es_alloc_extent(ext4_lblk_t lblk, ext4_lblk_t len, ext4_fsblk_t pblk)
> return es;
> }
>
> -static void ext4_es_free_extent(struct extent_status *es)
> +static void ext4_es_free_extent(struct inode *inode, struct extent_status *es)
> {
> kmem_cache_free(ext4_es_cachep, es);
> }
> @@ -326,8 +326,9 @@ static int ext4_es_can_be_merged(struct extent_status *es1,
> }
>
> static struct extent_status *
> -ext4_es_try_to_merge_left(struct ext4_es_tree *tree, struct extent_status *es)
> +ext4_es_try_to_merge_left(struct inode *inode, struct extent_status *es)
> {
> + struct ext4_es_tree *tree = &EXT4_I(inode)->i_es_tree;
> struct extent_status *es1;
> struct rb_node *node;
>
> @@ -339,7 +340,7 @@ ext4_es_try_to_merge_left(struct ext4_es_tree *tree, struct extent_status *es)
> if (ext4_es_can_be_merged(es1, es)) {
> es1->es_len += es->es_len;
> rb_erase(&es->rb_node, &tree->root);
> - ext4_es_free_extent(es);
> + ext4_es_free_extent(inode, es);
> es = es1;
> }
>
> @@ -347,8 +348,9 @@ ext4_es_try_to_merge_left(struct ext4_es_tree *tree, struct extent_status *es)
> }
>
> static struct extent_status *
> -ext4_es_try_to_merge_right(struct ext4_es_tree *tree, struct extent_status *es)
> +ext4_es_try_to_merge_right(struct inode *inode, struct extent_status *es)
> {
> + struct ext4_es_tree *tree = &EXT4_I(inode)->i_es_tree;
> struct extent_status *es1;
> struct rb_node *node;
>
> @@ -360,15 +362,15 @@ ext4_es_try_to_merge_right(struct ext4_es_tree *tree, struct extent_status *es)
> if (ext4_es_can_be_merged(es, es1)) {
> es->es_len += es1->es_len;
> rb_erase(node, &tree->root);
> - ext4_es_free_extent(es1);
> + ext4_es_free_extent(inode, es1);
> }
>
> return es;
> }
>
> -static int __es_insert_extent(struct ext4_es_tree *tree,
> - struct extent_status *newes)
> +static int __es_insert_extent(struct inode *inode, struct extent_status *newes)
> {
> + struct ext4_es_tree *tree = &EXT4_I(inode)->i_es_tree;
> struct rb_node **p = &tree->root.rb_node;
> struct rb_node *parent = NULL;
> struct extent_status *es;
> @@ -389,14 +391,14 @@ static int __es_insert_extent(struct ext4_es_tree *tree,
> ext4_es_is_unwritten(es))
> ext4_es_store_pblock(es,
> newes->es_pblk);
> - es = ext4_es_try_to_merge_left(tree, es);
> + es = ext4_es_try_to_merge_left(inode, es);
> goto out;
> }
> p = &(*p)->rb_left;
> } else if (newes->es_lblk > ext4_es_end(es)) {
> if (ext4_es_can_be_merged(es, newes)) {
> es->es_len += newes->es_len;
> - es = ext4_es_try_to_merge_right(tree, es);
> + es = ext4_es_try_to_merge_right(inode, es);
> goto out;
> }
> p = &(*p)->rb_right;
> @@ -406,7 +408,7 @@ static int __es_insert_extent(struct ext4_es_tree *tree,
> }
> }
>
> - es = ext4_es_alloc_extent(newes->es_lblk, newes->es_len,
> + es = ext4_es_alloc_extent(inode, newes->es_lblk, newes->es_len,
> newes->es_pblk);
> if (!es)
> return -ENOMEM;
> @@ -430,7 +432,6 @@ int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk,
> ext4_lblk_t len, ext4_fsblk_t pblk,
> unsigned long long status)
> {
> - struct ext4_es_tree *tree;
> struct extent_status newes;
> ext4_lblk_t end = lblk + len - 1;
> int err = 0;
> @@ -447,11 +448,10 @@ int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk,
> trace_ext4_es_insert_extent(inode, &newes);
>
> write_lock(&EXT4_I(inode)->i_es_lock);
> - tree = &EXT4_I(inode)->i_es_tree;
> - err = __es_remove_extent(tree, lblk, end);
> + err = __es_remove_extent(inode, lblk, end);
> if (err != 0)
> goto error;
> - err = __es_insert_extent(tree, &newes);
> + err = __es_insert_extent(inode, &newes);
>
> error:
> write_unlock(&EXT4_I(inode)->i_es_lock);
> @@ -521,9 +521,10 @@ out:
> return found;
> }
>
> -static int __es_remove_extent(struct ext4_es_tree *tree, ext4_lblk_t lblk,
> - ext4_lblk_t end)
> +static int __es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
> + ext4_lblk_t end)
> {
> + struct ext4_es_tree *tree = &EXT4_I(inode)->i_es_tree;
> struct rb_node *node;
> struct extent_status *es;
> struct extent_status orig_es;
> @@ -561,7 +562,7 @@ static int __es_remove_extent(struct ext4_es_tree *tree, ext4_lblk_t lblk,
> ext4_es_store_pblock(&newes, block);
> }
> ext4_es_store_status(&newes, ext4_es_status(&orig_es));
> - err = __es_insert_extent(tree, &newes);
> + err = __es_insert_extent(inode, &newes);
> if (err) {
> es->es_lblk = orig_es.es_lblk;
> es->es_len = orig_es.es_len;
> @@ -590,7 +591,7 @@ static int __es_remove_extent(struct ext4_es_tree *tree, ext4_lblk_t lblk,
> while (es && ext4_es_end(es) <= end) {
> node = rb_next(&es->rb_node);
> rb_erase(&es->rb_node, &tree->root);
> - ext4_es_free_extent(es);
> + ext4_es_free_extent(inode, es);
> if (!node) {
> es = NULL;
> break;
> @@ -622,7 +623,6 @@ out:
> int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
> ext4_lblk_t len)
> {
> - struct ext4_es_tree *tree;
> ext4_lblk_t end;
> int err = 0;
>
> @@ -633,10 +633,8 @@ int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
> end = lblk + len - 1;
> BUG_ON(end < lblk);
>
> - tree = &EXT4_I(inode)->i_es_tree;
> -
> write_lock(&EXT4_I(inode)->i_es_lock);
> - err = __es_remove_extent(tree, lblk, end);
> + err = __es_remove_extent(inode, lblk, end);
> write_unlock(&EXT4_I(inode)->i_es_lock);
> ext4_es_print_tree(inode);
> return err;
> --
> 1.7.12.rc2.18.g61b472e
>
--
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