From 364ecf3651e0862152c8b340d7cb3021dc0122c7 Mon Sep 17 00:00:00 2001
From: Qu Wenruo <quwenruo@cn.fujitsu.com>
Date: Mon, 27 Feb 2017 15:10:38 +0800
Patch-mainline: v4.13-rc1
Git-commit: 364ecf3651e0862152c8b340d7cb3021dc0122c7
References: dependency for bsc#1031392
Subject: [PATCH 5/6] btrfs: qgroup: Introduce extent changeset for qgroup
reserve functions
Introduce a new parameter, struct extent_changeset for
btrfs_qgroup_reserved_data() and its callers.
Such extent_changeset was used in btrfs_qgroup_reserve_data() to record
which range it reserved in current reserve, so it can free it in error
paths.
The reason we need to export it to callers is, at buffered write error
path, without knowing what exactly which range we reserved in current
allocation, we can free space which is not reserved by us.
This will lead to qgroup reserved space underflow.
Reviewed-by: Chandan Rajendra <chandan@linux.vnet.ibm.com>
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/ctree.h | 6 +++--
fs/btrfs/extent-tree.c | 23 ++++++++++++----------
fs/btrfs/extent_io.h | 34 ++++++++++++++++++++++++++++++++
fs/btrfs/file.c | 12 ++++++++---
fs/btrfs/inode-map.c | 4 ++-
fs/btrfs/inode.c | 18 +++++++++++++----
fs/btrfs/ioctl.c | 5 +++-
fs/btrfs/qgroup.c | 51 +++++++++++++++++++++++++++++++------------------
fs/btrfs/qgroup.h | 3 +-
fs/btrfs/relocation.c | 4 ++-
10 files changed, 119 insertions(+), 41 deletions(-)
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -2722,8 +2722,9 @@ enum btrfs_flush_state {
COMMIT_TRANS = 6,
};
-int btrfs_check_data_free_space(struct inode *inode, u64 start, u64 len);
int btrfs_alloc_data_chunk_ondemand(struct btrfs_inode *inode, u64 bytes);
+int btrfs_check_data_free_space(struct inode *inode,
+ struct extent_changeset **reserved, u64 start, u64 len);
void btrfs_free_reserved_data_space(struct inode *inode, u64 start, u64 len);
void btrfs_free_reserved_data_space_noquota(struct inode *inode, u64 start,
u64 len);
@@ -2741,7 +2742,8 @@ void btrfs_subvolume_release_metadata(st
struct btrfs_block_rsv *rsv);
int btrfs_delalloc_reserve_metadata(struct btrfs_inode *inode, u64 num_bytes);
void btrfs_delalloc_release_metadata(struct btrfs_inode *inode, u64 num_bytes);
-int btrfs_delalloc_reserve_space(struct inode *inode, u64 start, u64 len);
+int btrfs_delalloc_reserve_space(struct inode *inode,
+ struct extent_changeset **reserved, u64 start, u64 len);
void btrfs_delalloc_release_space(struct inode *inode, u64 start, u64 len);
void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, unsigned short type);
struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_fs_info *fs_info,
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -3401,6 +3401,7 @@ static int cache_save_setup(struct btrfs
struct btrfs_fs_info *fs_info = block_group->fs_info;
struct btrfs_root *root = fs_info->tree_root;
struct inode *inode = NULL;
+ struct extent_changeset *data_reserved = NULL;
u64 alloc_hint = 0;
int dcs = BTRFS_DC_ERROR;
u64 num_pages = 0;
@@ -3520,7 +3521,7 @@ again:
num_pages *= 16;
num_pages *= PAGE_SIZE;
- ret = btrfs_check_data_free_space(inode, 0, num_pages);
+ ret = btrfs_check_data_free_space(inode, &data_reserved, 0, num_pages);
if (ret)
goto out_put;
@@ -3551,6 +3552,7 @@ out:
block_group->disk_cache_state = dcs;
spin_unlock(&block_group->lock);
+ extent_changeset_free(data_reserved);
return ret;
}
@@ -4310,12 +4312,8 @@ commit_trans:
return ret;
}
-/*
- * New check_data_free_space() with ability for precious data reservation
- * Will replace old btrfs_check_data_free_space(), but for patch split,
- * add a new function first and then replace it.
- */
-int btrfs_check_data_free_space(struct inode *inode, u64 start, u64 len)
+int btrfs_check_data_free_space(struct inode *inode,
+ struct extent_changeset **reserved, u64 start, u64 len)
{
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
int ret;
@@ -4330,9 +4328,11 @@ int btrfs_check_data_free_space(struct i
return ret;
/* Use new btrfs_qgroup_reserve_data to reserve precious data space. */
- ret = btrfs_qgroup_reserve_data(inode, start, len);
+ ret = btrfs_qgroup_reserve_data(inode, reserved, start, len);
if (ret < 0)
btrfs_free_reserved_data_space_noquota(inode, start, len);
+ else
+ ret = 0;
return ret;
}
@@ -6152,6 +6152,8 @@ void btrfs_delalloc_release_metadata(str
* @inode: inode we're writing to
* @start: start range we are writing to
* @len: how long the range we are writing to
+ * @reserved: mandatory parameter, record actually reserved qgroup ranges of
+ * current reservation.
*
* This will do the following things
*
@@ -6169,11 +6171,12 @@ void btrfs_delalloc_release_metadata(str
* Return 0 for success
* Return <0 for error(-ENOSPC or -EQUOT)
*/
-int btrfs_delalloc_reserve_space(struct inode *inode, u64 start, u64 len)
+int btrfs_delalloc_reserve_space(struct inode *inode,
+ struct extent_changeset **reserved, u64 start, u64 len)
{
int ret;
- ret = btrfs_check_data_free_space(inode, start, len);
+ ret = btrfs_check_data_free_space(inode, reserved, start, len);
if (ret < 0)
return ret;
ret = btrfs_delalloc_reserve_metadata(BTRFS_I(inode), len);
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -211,6 +211,40 @@ struct extent_changeset {
struct ulist range_changed;
};
+static inline void extent_changeset_init(struct extent_changeset *changeset)
+{
+ changeset->bytes_changed = 0;
+ ulist_init(&changeset->range_changed);
+}
+
+static inline struct extent_changeset *extent_changeset_alloc(void)
+{
+ struct extent_changeset *ret;
+
+ ret = kmalloc(sizeof(*ret), GFP_KERNEL);
+ if (!ret)
+ return NULL;
+
+ extent_changeset_init(ret);
+ return ret;
+}
+
+static inline void extent_changeset_release(struct extent_changeset *changeset)
+{
+ if (!changeset)
+ return;
+ changeset->bytes_changed = 0;
+ ulist_release(&changeset->range_changed);
+}
+
+static inline void extent_changeset_free(struct extent_changeset *changeset)
+{
+ if (!changeset)
+ return;
+ extent_changeset_release(changeset);
+ kfree(changeset);
+}
+
static inline void extent_set_compress_type(unsigned long *bio_flags,
int compress_type)
{
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1581,6 +1581,7 @@ static noinline ssize_t __btrfs_buffered
struct btrfs_root *root = BTRFS_I(inode)->root;
struct page **pages = NULL;
struct extent_state *cached_state = NULL;
+ struct extent_changeset *data_reserved = NULL;
u64 release_bytes = 0;
u64 lockstart;
u64 lockend;
@@ -1628,7 +1629,9 @@ static noinline ssize_t __btrfs_buffered
reserve_bytes = round_up(write_bytes + sector_offset,
fs_info->sectorsize);
- ret = btrfs_check_data_free_space(inode, pos, write_bytes);
+ extent_changeset_release(data_reserved);
+ ret = btrfs_check_data_free_space(inode, &data_reserved, pos,
+ write_bytes);
if (ret < 0) {
if ((BTRFS_I(inode)->flags & (BTRFS_INODE_NODATACOW |
BTRFS_INODE_PREALLOC)) &&
@@ -1802,6 +1805,7 @@ again:
}
}
+ extent_changeset_free(data_reserved);
return num_written ? num_written : ret;
}
@@ -2787,6 +2791,7 @@ static long btrfs_fallocate(struct file
{
struct inode *inode = file_inode(file);
struct extent_state *cached_state = NULL;
+ struct extent_changeset *data_reserved = NULL;
struct falloc_range *range;
struct falloc_range *tmp;
struct list_head reserve_list;
@@ -2916,8 +2921,8 @@ static long btrfs_fallocate(struct file
free_extent_map(em);
break;
}
- ret = btrfs_qgroup_reserve_data(inode, cur_offset,
- last_byte - cur_offset);
+ ret = btrfs_qgroup_reserve_data(inode, &data_reserved,
+ cur_offset, last_byte - cur_offset);
if (ret < 0) {
free_extent_map(em);
break;
@@ -2989,6 +2994,7 @@ out:
if (ret != 0)
btrfs_free_reserved_data_space(inode, alloc_start,
alloc_end - cur_offset);
+ extent_changeset_free(data_reserved);
return ret;
}
--- a/fs/btrfs/inode-map.c
+++ b/fs/btrfs/inode-map.c
@@ -400,6 +400,7 @@ int btrfs_save_ino_cache(struct btrfs_ro
struct btrfs_path *path;
struct inode *inode;
struct btrfs_block_rsv *rsv;
+ struct extent_changeset *data_reserved = NULL;
u64 num_bytes;
u64 alloc_hint = 0;
int ret;
@@ -492,7 +493,7 @@ again:
/* Just to make sure we have enough space */
prealloc += 8 * PAGE_SIZE;
- ret = btrfs_delalloc_reserve_space(inode, 0, prealloc);
+ ret = btrfs_delalloc_reserve_space(inode, &data_reserved, 0, prealloc);
if (ret)
goto out_put;
@@ -516,6 +517,7 @@ out:
trans->bytes_reserved = num_bytes;
btrfs_free_path(path);
+ extent_changeset_free(data_reserved);
return ret;
}
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -2034,6 +2034,7 @@ static void btrfs_writepage_fixup_worker
struct btrfs_writepage_fixup *fixup;
struct btrfs_ordered_extent *ordered;
struct extent_state *cached_state = NULL;
+ struct extent_changeset *data_reserved = NULL;
struct page *page;
struct inode *inode;
u64 page_start;
@@ -2071,7 +2072,7 @@ again:
goto again;
}
- ret = btrfs_delalloc_reserve_space(inode, page_start,
+ ret = btrfs_delalloc_reserve_space(inode, &data_reserved, page_start,
PAGE_SIZE);
if (ret) {
mapping_set_error(page->mapping, ret);
@@ -2091,6 +2092,7 @@ out_page:
unlock_page(page);
put_page(page);
kfree(fixup);
+ extent_changeset_free(data_reserved);
}
/*
@@ -4766,6 +4768,7 @@ int btrfs_truncate_block(struct inode *i
struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
struct btrfs_ordered_extent *ordered;
struct extent_state *cached_state = NULL;
+ struct extent_changeset *data_reserved = NULL;
char *kaddr;
u32 blocksize = fs_info->sectorsize;
pgoff_t index = from >> PAGE_SHIFT;
@@ -4780,7 +4783,7 @@ int btrfs_truncate_block(struct inode *i
(!len || ((len & (blocksize - 1)) == 0)))
goto out;
- ret = btrfs_delalloc_reserve_space(inode,
+ ret = btrfs_delalloc_reserve_space(inode, &data_reserved,
round_down(from, blocksize), blocksize);
if (ret)
goto out;
@@ -4865,6 +4868,7 @@ out_unlock:
unlock_page(page);
put_page(page);
out:
+ extent_changeset_free(data_reserved);
return ret;
}
@@ -8698,6 +8702,7 @@ static ssize_t btrfs_direct_IO(struct ki
struct inode *inode = file->f_mapping->host;
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
struct btrfs_dio_data dio_data = { 0 };
+ struct extent_changeset *data_reserved = NULL;
loff_t offset = iocb->ki_pos;
size_t count = 0;
int flags = 0;
@@ -8737,7 +8742,8 @@ static ssize_t btrfs_direct_IO(struct ki
ret = -EAGAIN;
goto out;
}
- ret = btrfs_delalloc_reserve_space(inode, offset, count);
+ ret = btrfs_delalloc_reserve_space(inode, &data_reserved,
+ offset, count);
if (ret)
goto out;
dio_data.outstanding_extents = count_max_extents(count);
@@ -8794,6 +8800,7 @@ out:
if (relock)
inode_lock(inode);
+ extent_changeset_free(data_reserved);
return ret;
}
@@ -9026,6 +9033,7 @@ int btrfs_page_mkwrite(struct vm_fault *
struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
struct btrfs_ordered_extent *ordered;
struct extent_state *cached_state = NULL;
+ struct extent_changeset *data_reserved = NULL;
char *kaddr;
unsigned long zero_start;
loff_t size;
@@ -9051,7 +9059,7 @@ int btrfs_page_mkwrite(struct vm_fault *
* end up waiting indefinitely to get a lock on the page currently
* being processed by btrfs_page_mkwrite() function.
*/
- ret = btrfs_delalloc_reserve_space(inode, page_start,
+ ret = btrfs_delalloc_reserve_space(inode, &data_reserved, page_start,
reserved_space);
if (!ret) {
ret = file_update_time(vmf->vma->vm_file);
@@ -9157,6 +9165,7 @@ again:
out_unlock:
if (!ret) {
sb_end_pagefault(inode->i_sb);
+ extent_changeset_free(data_reserved);
return VM_FAULT_LOCKED;
}
unlock_page(page);
@@ -9164,6 +9173,7 @@ out:
btrfs_delalloc_release_space(inode, page_start, reserved_space);
out_noreserve:
sb_end_pagefault(inode->i_sb);
+ extent_changeset_free(data_reserved);
return ret;
}
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -1127,6 +1127,7 @@ static int cluster_pages_for_defrag(stru
struct btrfs_ordered_extent *ordered;
struct extent_state *cached_state = NULL;
struct extent_io_tree *tree;
+ struct extent_changeset *data_reserved = NULL;
gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping);
file_end = (isize - 1) >> PAGE_SHIFT;
@@ -1135,7 +1136,7 @@ static int cluster_pages_for_defrag(stru
page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1);
- ret = btrfs_delalloc_reserve_space(inode,
+ ret = btrfs_delalloc_reserve_space(inode, &data_reserved,
start_index << PAGE_SHIFT,
page_cnt << PAGE_SHIFT);
if (ret)
@@ -1247,6 +1248,7 @@ again:
unlock_page(pages[i]);
put_page(pages[i]);
}
+ extent_changeset_free(data_reserved);
return i_done;
out:
for (i = 0; i < i_done; i++) {
@@ -1256,6 +1258,7 @@ out:
btrfs_delalloc_release_space(inode,
start_index << PAGE_SHIFT,
page_cnt << PAGE_SHIFT);
+ extent_changeset_free(data_reserved);
return ret;
}
--- a/fs/btrfs/qgroup.c
+++ b/fs/btrfs/qgroup.c
@@ -2830,43 +2830,60 @@ btrfs_qgroup_rescan_resume(struct btrfs_
* Return <0 for error (including -EQUOT)
*
* NOTE: this function may sleep for memory allocation.
+ * if btrfs_qgroup_reserve_data() is called multiple times with
+ * same @reserved, caller must ensure when error happens it's OK
+ * to free *ALL* reserved space.
*/
-int btrfs_qgroup_reserve_data(struct inode *inode, u64 start, u64 len)
+int btrfs_qgroup_reserve_data(struct inode *inode,
+ struct extent_changeset **reserved_ret, u64 start,
+ u64 len)
{
struct btrfs_root *root = BTRFS_I(inode)->root;
- struct extent_changeset changeset;
struct ulist_node *unode;
struct ulist_iterator uiter;
+ struct extent_changeset *reserved;
+ u64 orig_reserved;
+ u64 to_reserve;
int ret;
if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &root->fs_info->flags) ||
!is_fstree(root->objectid) || len == 0)
return 0;
- changeset.bytes_changed = 0;
- ulist_init(&changeset.range_changed);
+ /* @reserved parameter is mandatory for qgroup */
+ if (WARN_ON(!reserved_ret))
+ return -EINVAL;
+ if (!*reserved_ret) {
+ *reserved_ret = extent_changeset_alloc();
+ if (!*reserved_ret)
+ return -ENOMEM;
+ }
+ reserved = *reserved_ret;
+ /* Record already reserved space */
+ orig_reserved = reserved->bytes_changed;
ret = set_record_extent_bits(&BTRFS_I(inode)->io_tree, start,
- start + len -1, EXTENT_QGROUP_RESERVED, &changeset);
+ start + len -1, EXTENT_QGROUP_RESERVED, reserved);
+
+ /* Newly reserved space */
+ to_reserve = reserved->bytes_changed - orig_reserved;
trace_btrfs_qgroup_reserve_data(inode, start, len,
- changeset.bytes_changed,
- QGROUP_RESERVE);
+ to_reserve, QGROUP_RESERVE);
if (ret < 0)
goto cleanup;
- ret = qgroup_reserve(root, changeset.bytes_changed, true);
+ ret = qgroup_reserve(root, to_reserve, true);
if (ret < 0)
goto cleanup;
- ulist_release(&changeset.range_changed);
return ret;
cleanup:
- /* cleanup already reserved ranges */
+ /* cleanup *ALL* already reserved ranges */
ULIST_ITER_INIT(&uiter);
- while ((unode = ulist_next(&changeset.range_changed, &uiter)))
+ while ((unode = ulist_next(&reserved->range_changed, &uiter)))
clear_extent_bit(&BTRFS_I(inode)->io_tree, unode->val,
unode->aux, EXTENT_QGROUP_RESERVED, 0, 0, NULL,
GFP_NOFS);
- ulist_release(&changeset.range_changed);
+ extent_changeset_release(reserved);
return ret;
}
@@ -2877,8 +2894,7 @@ static int __btrfs_qgroup_release_data(s
int trace_op = QGROUP_RELEASE;
int ret;
- changeset.bytes_changed = 0;
- ulist_init(&changeset.range_changed);
+ extent_changeset_init(&changeset);
ret = clear_record_extent_bits(&BTRFS_I(inode)->io_tree, start,
start + len -1, EXTENT_QGROUP_RESERVED, &changeset);
if (ret < 0)
@@ -2894,7 +2910,7 @@ static int __btrfs_qgroup_release_data(s
changeset.bytes_changed);
ret = changeset.bytes_changed;
out:
- ulist_release(&changeset.range_changed);
+ extent_changeset_release(&changeset);
return ret;
}
@@ -2994,8 +3010,7 @@ void btrfs_qgroup_check_reserved_leak(st
struct ulist_iterator iter;
int ret;
- changeset.bytes_changed = 0;
- ulist_init(&changeset.range_changed);
+ extent_changeset_init(&changeset);
ret = clear_record_extent_bits(&BTRFS_I(inode)->io_tree, 0, (u64)-1,
EXTENT_QGROUP_RESERVED, &changeset);
@@ -3012,5 +3027,5 @@ void btrfs_qgroup_check_reserved_leak(st
changeset.bytes_changed);
}
- ulist_release(&changeset.range_changed);
+ extent_changeset_release(&changeset);
}
--- a/fs/btrfs/qgroup.h
+++ b/fs/btrfs/qgroup.h
@@ -242,7 +242,8 @@ int btrfs_verify_qgroup_counts(struct bt
#endif
/* New io_tree based accurate qgroup reserve API */
-int btrfs_qgroup_reserve_data(struct inode *inode, u64 start, u64 len);
+int btrfs_qgroup_reserve_data(struct inode *inode,
+ struct extent_changeset **reserved, u64 start, u64 len);
int btrfs_qgroup_release_data(struct inode *inode, u64 start, u64 len);
int btrfs_qgroup_free_data(struct inode *inode, u64 start, u64 len);
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -3093,11 +3093,12 @@ int prealloc_file_extent_cluster(struct
u64 prealloc_start = cluster->start - offset;
u64 prealloc_end = cluster->end - offset;
u64 cur_offset;
+ struct extent_changeset *data_reserved = NULL;
BUG_ON(cluster->start != cluster->boundary[0]);
inode_lock(inode);
- ret = btrfs_check_data_free_space(inode, prealloc_start,
+ ret = btrfs_check_data_free_space(inode, &data_reserved, prealloc_start,
prealloc_end + 1 - prealloc_start);
if (ret)
goto out;
@@ -3129,6 +3130,7 @@ int prealloc_file_extent_cluster(struct
prealloc_end + 1 - cur_offset);
out:
inode_unlock(inode);
+ extent_changeset_free(data_reserved);
return ret;
}