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Date: Mon, 09 May 2011 17:46:36 -0700
From: Mingming Cao <cmm@...ibm.com>
To: Allison Henderson <achender@...ux.vnet.ibm.com>
Cc: Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: [Ext4 punch hole 1/5 v7] Ext4 Punch Hole Support: Add flag to
ext4_has_free_blocks
On Sat, 2011-05-07 at 16:53 -0700, Allison Henderson wrote:
> This patch adds an allocation request flag to the
> ext4_has_free_blocks function which
> enables the use of reserved blocks. This will allow
> a punch hole to proceed even if the disk is full.
> Punching a hole may require additional blocks to first
> split the extents.
>
> Because ext4_has_free_blocks is a low level function,
> the flag needs to be passed down through several
> functions listed below:
>
> ext4_ext_insert_extent
> ext4_ext_create_new_leaf
> ext4_ext_grow_indepth
> ext4_ext_split
> ext4_ext_new_meta_block
> ext4_mb_new_blocks
> ext4_claim_free_blocks
> ext4_has_free_blocks
>
> Signed-off-by: Allison Henderson <achender@...ibm.com>
Looks fine with me. You could add:
Reviewed-by: Mingming Cao <cmm@...ibm.com>
> ---
> :100644 100644 9c6cd51... 32003c2... M fs/ext4/balloc.c
> :100644 100644 076c5d2... 3ba6c31... M fs/ext4/ext4.h
> :100644 100644 e363f21... e04faeb... M fs/ext4/extents.c
> :100644 100644 f2fa5e8... f92c58b... M fs/ext4/inode.c
> :100644 100644 730c1a7... 85cc3ef... M fs/ext4/mballoc.c
> :100644 100644 b545ca1... 2d9b12c... M fs/ext4/xattr.c
> fs/ext4/balloc.c | 17 +++++++++++------
> fs/ext4/ext4.h | 11 ++++++++---
> fs/ext4/extents.c | 30 ++++++++++++++++++++----------
> fs/ext4/inode.c | 4 ++--
> fs/ext4/mballoc.c | 16 ++++++++++++----
> fs/ext4/xattr.c | 2 +-
> 6 files changed, 54 insertions(+), 26 deletions(-)
>
> diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
> index 9c6cd51..32003c2 100644
> --- a/fs/ext4/balloc.c
> +++ b/fs/ext4/balloc.c
> @@ -493,7 +493,8 @@ error_return:
> * Check if filesystem has nblocks free & available for allocation.
> * On success return 1, return 0 on failure.
> */
> -static int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks)
> +static int ext4_has_free_blocks(struct ext4_sb_info *sbi,
> + s64 nblocks, unsigned int flags)
> {
> s64 free_blocks, dirty_blocks, root_blocks;
> struct percpu_counter *fbc = &sbi->s_freeblocks_counter;
> @@ -517,7 +518,9 @@ static int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks)
> /* Hm, nope. Are (enough) root reserved blocks available? */
> if (sbi->s_resuid == current_fsuid() ||
> ((sbi->s_resgid != 0) && in_group_p(sbi->s_resgid)) ||
> - capable(CAP_SYS_RESOURCE)) {
> + capable(CAP_SYS_RESOURCE) ||
> + (flags & EXT4_MB_USE_ROOT_BLOCKS)) {
> +
> if (free_blocks >= (nblocks + dirty_blocks))
> return 1;
> }
> @@ -526,9 +529,9 @@ static int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks)
> }
>
> int ext4_claim_free_blocks(struct ext4_sb_info *sbi,
> - s64 nblocks)
> + s64 nblocks, unsigned int flags)
> {
> - if (ext4_has_free_blocks(sbi, nblocks)) {
> + if (ext4_has_free_blocks(sbi, nblocks, flags)) {
> percpu_counter_add(&sbi->s_dirtyblocks_counter, nblocks);
> return 0;
> } else
> @@ -549,7 +552,7 @@ int ext4_claim_free_blocks(struct ext4_sb_info *sbi,
> */
> int ext4_should_retry_alloc(struct super_block *sb, int *retries)
> {
> - if (!ext4_has_free_blocks(EXT4_SB(sb), 1) ||
> + if (!ext4_has_free_blocks(EXT4_SB(sb), 1, 0) ||
> (*retries)++ > 3 ||
> !EXT4_SB(sb)->s_journal)
> return 0;
> @@ -572,7 +575,8 @@ int ext4_should_retry_alloc(struct super_block *sb, int *retries)
> * error stores in errp pointer
> */
> ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
> - ext4_fsblk_t goal, unsigned long *count, int *errp)
> + ext4_fsblk_t goal, unsigned long *count, int *errp,
> + unsigned int flags)
> {
> struct ext4_allocation_request ar;
> ext4_fsblk_t ret;
> @@ -582,6 +586,7 @@ ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
> ar.inode = inode;
> ar.goal = goal;
> ar.len = count ? *count : 1;
> + ar.flags = flags;
>
> ret = ext4_mb_new_blocks(handle, &ar, errp);
> if (count)
> diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
> index 076c5d2..3ba6c31 100644
> --- a/fs/ext4/ext4.h
> +++ b/fs/ext4/ext4.h
> @@ -108,7 +108,8 @@ typedef unsigned int ext4_group_t;
> #define EXT4_MB_DELALLOC_RESERVED 0x0400
> /* We are doing stream allocation */
> #define EXT4_MB_STREAM_ALLOC 0x0800
> -
> +/* Use reserved root blocks if needed */
> +#define EXT4_MB_USE_ROOT_BLOCKS 0x1000
>
> struct ext4_allocation_request {
> /* target inode for block we're allocating */
> @@ -512,6 +513,8 @@ struct ext4_new_group_data {
> /* Convert extent to initialized after IO complete */
> #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
> EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
> + /* Punch out blocks of an extent */
> +#define EXT4_GET_BLOCKS_PUNCH_OUT_EXT 0x0020
>
> /*
> * Flags used by ext4_free_blocks
> @@ -1653,8 +1656,10 @@ extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
> extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
> ext4_group_t group);
> extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
> - ext4_fsblk_t goal, unsigned long *count, int *errp);
> -extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
> + ext4_fsblk_t goal, unsigned long *count,
> + int *errp, unsigned int flags);
> +extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi,
> + s64 nblocks, unsigned int flags);
> extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb,
> ext4_fsblk_t block, unsigned long count);
> extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *);
> diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
> index e363f21..e04faeb 100644
> --- a/fs/ext4/extents.c
> +++ b/fs/ext4/extents.c
> @@ -192,12 +192,13 @@ static ext4_fsblk_t ext4_ext_find_goal(struct inode *inode,
> static ext4_fsblk_t
> ext4_ext_new_meta_block(handle_t *handle, struct inode *inode,
> struct ext4_ext_path *path,
> - struct ext4_extent *ex, int *err)
> + struct ext4_extent *ex, int *err, unsigned int flags)
> {
> ext4_fsblk_t goal, newblock;
>
> goal = ext4_ext_find_goal(inode, path, le32_to_cpu(ex->ee_block));
> - newblock = ext4_new_meta_blocks(handle, inode, goal, NULL, err);
> + newblock = ext4_new_meta_blocks(handle, inode, goal,
> + NULL, err, flags);
> return newblock;
> }
>
> @@ -793,7 +794,8 @@ static int ext4_ext_insert_index(handle_t *handle, struct inode *inode,
> */
> static int ext4_ext_split(handle_t *handle, struct inode *inode,
> struct ext4_ext_path *path,
> - struct ext4_extent *newext, int at)
> + struct ext4_extent *newext, int at,
> + unsigned int flags)
> {
> struct buffer_head *bh = NULL;
> int depth = ext_depth(inode);
> @@ -847,7 +849,7 @@ static int ext4_ext_split(handle_t *handle, struct inode *inode,
> ext_debug("allocate %d blocks for indexes/leaf\n", depth - at);
> for (a = 0; a < depth - at; a++) {
> newblock = ext4_ext_new_meta_block(handle, inode, path,
> - newext, &err);
> + newext, &err, flags);
> if (newblock == 0)
> goto cleanup;
> ablocks[a] = newblock;
> @@ -1057,7 +1059,8 @@ cleanup:
> */
> static int ext4_ext_grow_indepth(handle_t *handle, struct inode *inode,
> struct ext4_ext_path *path,
> - struct ext4_extent *newext)
> + struct ext4_extent *newext,
> + unsigned int flags)
> {
> struct ext4_ext_path *curp = path;
> struct ext4_extent_header *neh;
> @@ -1065,7 +1068,8 @@ static int ext4_ext_grow_indepth(handle_t *handle, struct inode *inode,
> ext4_fsblk_t newblock;
> int err = 0;
>
> - newblock = ext4_ext_new_meta_block(handle, inode, path, newext, &err);
> + newblock = ext4_ext_new_meta_block(handle, inode, path,
> + newext, &err, flags);
> if (newblock == 0)
> return err;
>
> @@ -1141,7 +1145,8 @@ out:
> */
> static int ext4_ext_create_new_leaf(handle_t *handle, struct inode *inode,
> struct ext4_ext_path *path,
> - struct ext4_extent *newext)
> + struct ext4_extent *newext,
> + unsigned int flags)
> {
> struct ext4_ext_path *curp;
> int depth, i, err = 0;
> @@ -1161,7 +1166,7 @@ repeat:
> if (EXT_HAS_FREE_INDEX(curp)) {
> /* if we found index with free entry, then use that
> * entry: create all needed subtree and add new leaf */
> - err = ext4_ext_split(handle, inode, path, newext, i);
> + err = ext4_ext_split(handle, inode, path, newext, i, flags);
> if (err)
> goto out;
>
> @@ -1174,7 +1179,8 @@ repeat:
> err = PTR_ERR(path);
> } else {
> /* tree is full, time to grow in depth */
> - err = ext4_ext_grow_indepth(handle, inode, path, newext);
> + err = ext4_ext_grow_indepth(handle, inode, path,
> + newext, flags);
> if (err)
> goto out;
>
> @@ -1693,6 +1699,7 @@ int ext4_ext_insert_extent(handle_t *handle, struct inode *inode,
> int depth, len, err;
> ext4_lblk_t next;
> unsigned uninitialized = 0;
> + int flags = 0;
>
> if (unlikely(ext4_ext_get_actual_len(newext) == 0)) {
> EXT4_ERROR_INODE(inode, "ext4_ext_get_actual_len(newext) == 0");
> @@ -1767,7 +1774,10 @@ repeat:
> * There is no free space in the found leaf.
> * We're gonna add a new leaf in the tree.
> */
> - err = ext4_ext_create_new_leaf(handle, inode, path, newext);
> + if (flag & EXT4_GET_BLOCKS_PUNCH_OUT_EXT)
> + flags = EXT4_MB_USE_ROOT_BLOCKS;
> + err = ext4_ext_create_new_leaf(handle, inode, path,
> + newext, flags);
> if (err)
> goto cleanup;
> depth = ext_depth(inode);
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index f2fa5e8..f92c58b 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -640,7 +640,7 @@ static int ext4_alloc_blocks(handle_t *handle, struct inode *inode,
> count = target;
> /* allocating blocks for indirect blocks and direct blocks */
> current_block = ext4_new_meta_blocks(handle, inode,
> - goal, &count, err);
> + goal, &count, err, 0);
> if (*err)
> goto failed_out;
>
> @@ -1930,7 +1930,7 @@ repeat:
> * We do still charge estimated metadata to the sb though;
> * we cannot afford to run out of free blocks.
> */
> - if (ext4_claim_free_blocks(sbi, md_needed + 1)) {
> + if (ext4_claim_free_blocks(sbi, md_needed + 1, 0)) {
> dquot_release_reservation_block(inode, 1);
> if (ext4_should_retry_alloc(inode->i_sb, &retries)) {
> yield();
> diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
> index 730c1a7..85cc3ef 100644
> --- a/fs/ext4/mballoc.c
> +++ b/fs/ext4/mballoc.c
> @@ -4299,7 +4299,9 @@ ext4_fsblk_t ext4_mb_new_blocks(handle_t *handle,
> * there is enough free blocks to do block allocation
> * and verify allocation doesn't exceed the quota limits.
> */
> - while (ar->len && ext4_claim_free_blocks(sbi, ar->len)) {
> + while (ar->len &&
> + ext4_claim_free_blocks(sbi, ar->len, ar->flags)) {
> +
> /* let others to free the space */
> yield();
> ar->len = ar->len >> 1;
> @@ -4309,9 +4311,15 @@ ext4_fsblk_t ext4_mb_new_blocks(handle_t *handle,
> return 0;
> }
> reserv_blks = ar->len;
> - while (ar->len && dquot_alloc_block(ar->inode, ar->len)) {
> - ar->flags |= EXT4_MB_HINT_NOPREALLOC;
> - ar->len--;
> + if (ar->flags & EXT4_MB_USE_ROOT_BLOCKS) {
> + dquot_alloc_block_nofail(ar->inode, ar->len);
> + } else {
> + while (ar->len &&
> + dquot_alloc_block(ar->inode, ar->len)) {
> +
> + ar->flags |= EXT4_MB_HINT_NOPREALLOC;
> + ar->len--;
> + }
> }
> inquota = ar->len;
> if (ar->len == 0) {
> diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
> index b545ca1..2d9b12c 100644
> --- a/fs/ext4/xattr.c
> +++ b/fs/ext4/xattr.c
> @@ -821,7 +821,7 @@ inserted:
> goal = goal & EXT4_MAX_BLOCK_FILE_PHYS;
>
> block = ext4_new_meta_blocks(handle, inode,
> - goal, NULL, &error);
> + goal, NULL, &error, 0);
> if (error)
> goto cleanup;
>
--
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