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Date: Sat, 07 May 2011 16:53:56 -0700
From: Allison Henderson <achender@...ux.vnet.ibm.com>
To: Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: [Ext4 punch hole 1/5 v7] Ext4 Punch Hole Support: Add flag to ext4_has_free_blocks
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>
---
: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;
--
1.7.1
--
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