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Message-ID: <20241025065448.3231672-3-haisuwang@tencent.com>
Date: Fri, 25 Oct 2024 14:54:41 +0800
From: iamhswang@...il.com
To: linux-btrfs@...r.kernel.org
Cc: clm@...com,
josef@...icpanda.com,
dsterba@...e.com,
wqu@...e.com,
boris@....io,
linux-kernel@...r.kernel.org,
iamhswang@...il.com,
Haisu Wang <haisuwang@...cent.com>
Subject: [PATCH 2/2] btrfs: simplify regions mark and keep start unchanged in err handling
From: Haisu Wang <haisuwang@...cent.com>
Simplify the regions mark by using cur_alloc_size only to present
the reserved but may failed to alloced extent. Remove the ram_size
as well since it is always consistent to the cur_alloc_size in the
context. Advanced the start mark in normal path until extent succeed
alloced and keep the start unchanged in error handling path.
PASSed the fstest generic/475 test for a hundred times with quota
enabled. And a modified generic/475 test by removing the sleep time
for a hundred times. About one tenth of the tests do enter the error
handling path due to fail to reserve extent.
Suggested-by: Qu Wenruo <wqu@...e.com>
Signed-off-by: Haisu Wang <haisuwang@...cent.com>
---
fs/btrfs/inode.c | 32 ++++++++++++++------------------
1 file changed, 14 insertions(+), 18 deletions(-)
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 3646734a7e59..7e67a6d50be2 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -1359,7 +1359,6 @@ static noinline int cow_file_range(struct btrfs_inode *inode,
u64 alloc_hint = 0;
u64 orig_start = start;
u64 num_bytes;
- unsigned long ram_size;
u64 cur_alloc_size = 0;
u64 min_alloc_size;
u64 blocksize = fs_info->sectorsize;
@@ -1367,7 +1366,6 @@ static noinline int cow_file_range(struct btrfs_inode *inode,
struct extent_map *em;
unsigned clear_bits;
unsigned long page_ops;
- bool extent_reserved = false;
int ret = 0;
if (btrfs_is_free_space_inode(inode)) {
@@ -1421,8 +1419,7 @@ static noinline int cow_file_range(struct btrfs_inode *inode,
struct btrfs_ordered_extent *ordered;
struct btrfs_file_extent file_extent;
- cur_alloc_size = num_bytes;
- ret = btrfs_reserve_extent(root, cur_alloc_size, cur_alloc_size,
+ ret = btrfs_reserve_extent(root, num_bytes, num_bytes,
min_alloc_size, 0, alloc_hint,
&ins, 1, 1);
if (ret == -EAGAIN) {
@@ -1453,9 +1450,7 @@ static noinline int cow_file_range(struct btrfs_inode *inode,
if (ret < 0)
goto out_unlock;
cur_alloc_size = ins.offset;
- extent_reserved = true;
- ram_size = ins.offset;
file_extent.disk_bytenr = ins.objectid;
file_extent.disk_num_bytes = ins.offset;
file_extent.num_bytes = ins.offset;
@@ -1463,14 +1458,14 @@ static noinline int cow_file_range(struct btrfs_inode *inode,
file_extent.offset = 0;
file_extent.compression = BTRFS_COMPRESS_NONE;
- lock_extent(&inode->io_tree, start, start + ram_size - 1,
+ lock_extent(&inode->io_tree, start, start + cur_alloc_size - 1,
&cached);
em = btrfs_create_io_em(inode, start, &file_extent,
BTRFS_ORDERED_REGULAR);
if (IS_ERR(em)) {
unlock_extent(&inode->io_tree, start,
- start + ram_size - 1, &cached);
+ start + cur_alloc_size - 1, &cached);
ret = PTR_ERR(em);
goto out_reserve;
}
@@ -1480,7 +1475,7 @@ static noinline int cow_file_range(struct btrfs_inode *inode,
1 << BTRFS_ORDERED_REGULAR);
if (IS_ERR(ordered)) {
unlock_extent(&inode->io_tree, start,
- start + ram_size - 1, &cached);
+ start + cur_alloc_size - 1, &cached);
ret = PTR_ERR(ordered);
goto out_drop_extent_cache;
}
@@ -1501,7 +1496,7 @@ static noinline int cow_file_range(struct btrfs_inode *inode,
*/
if (ret)
btrfs_drop_extent_map_range(inode, start,
- start + ram_size - 1,
+ start + cur_alloc_size - 1,
false);
}
btrfs_put_ordered_extent(ordered);
@@ -1519,7 +1514,7 @@ static noinline int cow_file_range(struct btrfs_inode *inode,
page_ops = (keep_locked ? 0 : PAGE_UNLOCK);
page_ops |= PAGE_SET_ORDERED;
- extent_clear_unlock_delalloc(inode, start, start + ram_size - 1,
+ extent_clear_unlock_delalloc(inode, start, start + cur_alloc_size - 1,
locked_folio, &cached,
EXTENT_LOCKED | EXTENT_DELALLOC,
page_ops);
@@ -1529,7 +1524,7 @@ static noinline int cow_file_range(struct btrfs_inode *inode,
num_bytes -= cur_alloc_size;
alloc_hint = ins.objectid + ins.offset;
start += cur_alloc_size;
- extent_reserved = false;
+ cur_alloc_size = 0;
/*
* btrfs_reloc_clone_csums() error, since start is increased
@@ -1545,7 +1540,7 @@ static noinline int cow_file_range(struct btrfs_inode *inode,
return ret;
out_drop_extent_cache:
- btrfs_drop_extent_map_range(inode, start, start + ram_size - 1, false);
+ btrfs_drop_extent_map_range(inode, start, start + cur_alloc_size - 1, false);
out_reserve:
btrfs_dec_block_group_reservations(fs_info, ins.objectid);
btrfs_free_reserved_extent(fs_info, ins.objectid, ins.offset, 1);
@@ -1599,13 +1594,12 @@ static noinline int cow_file_range(struct btrfs_inode *inode,
* to decrement again the data space_info's bytes_may_use counter,
* therefore we do not pass it the flag EXTENT_CLEAR_DATA_RESV.
*/
- if (extent_reserved) {
+ if (cur_alloc_size) {
extent_clear_unlock_delalloc(inode, start,
start + cur_alloc_size - 1,
locked_folio, &cached, clear_bits,
page_ops);
btrfs_qgroup_free_data(inode, NULL, start, cur_alloc_size, NULL);
- start += cur_alloc_size;
}
/*
@@ -1614,11 +1608,13 @@ static noinline int cow_file_range(struct btrfs_inode *inode,
* space_info's bytes_may_use counter, reserved in
* btrfs_check_data_free_space().
*/
- if (start < end) {
+ if (start + cur_alloc_size < end) {
clear_bits |= EXTENT_CLEAR_DATA_RESV;
- extent_clear_unlock_delalloc(inode, start, end, locked_folio,
+ extent_clear_unlock_delalloc(inode, start + cur_alloc_size,
+ end, locked_folio,
&cached, clear_bits, page_ops);
- btrfs_qgroup_free_data(inode, NULL, start, end - start + 1, NULL);
+ btrfs_qgroup_free_data(inode, NULL, start + cur_alloc_size,
+ end - start - cur_alloc_size + 1, NULL);
}
return ret;
}
--
2.43.5
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