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Message-Id: <20240904062925.716856-8-yi.zhang@huaweicloud.com>
Date: Wed, 4 Sep 2024 14:29:22 +0800
From: Zhang Yi <yi.zhang@...weicloud.com>
To: linux-ext4@...r.kernel.org
Cc: linux-fsdevel@...r.kernel.org,
linux-kernel@...r.kernel.org,
tytso@....edu,
adilger.kernel@...ger.ca,
jack@...e.cz,
ritesh.list@...il.com,
yi.zhang@...wei.com,
yi.zhang@...weicloud.com,
chengzhihao1@...wei.com,
yukuai3@...wei.com
Subject: [PATCH v2 07/10] ext4: refactor ext4_insert_range()
From: Zhang Yi <yi.zhang@...wei.com>
Simplify ext4_collapse_range() and make the code style the same as
ext4_collapse_range(), refactor it by a) rename variables, b) drop
redundant input parameters checking, move others to under i_rwsem,
preparing for later refactor, c) rename the three stale error tags.
Signed-off-by: Zhang Yi <yi.zhang@...wei.com>
---
fs/ext4/extents.c | 95 ++++++++++++++++++++++-------------------------
1 file changed, 45 insertions(+), 50 deletions(-)
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 5c0b4d512531..a6c24c229cb4 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -5391,45 +5391,37 @@ static int ext4_insert_range(struct file *file, loff_t offset, loff_t len)
handle_t *handle;
struct ext4_ext_path *path;
struct ext4_extent *extent;
- ext4_lblk_t offset_lblk, len_lblk, ee_start_lblk = 0;
+ ext4_lblk_t start_lblk, len_lblk, ee_start_lblk = 0;
unsigned int credits, ee_len;
- int ret = 0, depth, split_flag = 0;
- loff_t ioffset;
-
- /*
- * We need to test this early because xfstests assumes that an
- * insert range of (0, 1) will return EOPNOTSUPP if the file
- * system does not support insert range.
- */
- if (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
- return -EOPNOTSUPP;
-
- /* Insert range works only on fs cluster size aligned regions. */
- if (!IS_ALIGNED(offset | len, EXT4_CLUSTER_SIZE(sb)))
- return -EINVAL;
+ int ret, depth, split_flag = 0;
+ loff_t start;
trace_ext4_insert_range(inode, offset, len);
- offset_lblk = offset >> EXT4_BLOCK_SIZE_BITS(sb);
- len_lblk = len >> EXT4_BLOCK_SIZE_BITS(sb);
-
inode_lock(inode);
+
/* Currently just for extent based files */
if (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) {
ret = -EOPNOTSUPP;
- goto out_mutex;
+ goto out;
}
- /* Check whether the maximum file size would be exceeded */
- if (len > inode->i_sb->s_maxbytes - inode->i_size) {
- ret = -EFBIG;
- goto out_mutex;
+ /* Insert range works only on fs cluster size aligned regions. */
+ if (!IS_ALIGNED(offset | len, EXT4_CLUSTER_SIZE(sb))) {
+ ret = -EINVAL;
+ goto out;
}
/* Offset must be less than i_size */
if (offset >= inode->i_size) {
ret = -EINVAL;
- goto out_mutex;
+ goto out;
+ }
+
+ /* Check whether the maximum file size would be exceeded */
+ if (len > inode->i_sb->s_maxbytes - inode->i_size) {
+ ret = -EFBIG;
+ goto out;
}
/* Wait for existing dio to complete */
@@ -5437,7 +5429,7 @@ static int ext4_insert_range(struct file *file, loff_t offset, loff_t len)
ret = file_modified(file);
if (ret)
- goto out_mutex;
+ goto out;
/*
* Prevent page faults from reinstantiating pages we have released from
@@ -5447,25 +5439,24 @@ static int ext4_insert_range(struct file *file, loff_t offset, loff_t len)
ret = ext4_break_layouts(inode);
if (ret)
- goto out_mmap;
+ goto out_invalidate_lock;
/*
* Need to round down to align start offset to page size boundary
* for page size > block size.
*/
- ioffset = round_down(offset, PAGE_SIZE);
+ start = round_down(offset, PAGE_SIZE);
/* Write out all dirty pages */
- ret = filemap_write_and_wait_range(inode->i_mapping, ioffset,
- LLONG_MAX);
+ ret = filemap_write_and_wait_range(mapping, start, LLONG_MAX);
if (ret)
- goto out_mmap;
- truncate_pagecache(inode, ioffset);
+ goto out_invalidate_lock;
+ truncate_pagecache(inode, start);
credits = ext4_writepage_trans_blocks(inode);
handle = ext4_journal_start(inode, EXT4_HT_TRUNCATE, credits);
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
- goto out_mmap;
+ goto out_invalidate_lock;
}
ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_FALLOC_RANGE, handle);
@@ -5474,15 +5465,18 @@ static int ext4_insert_range(struct file *file, loff_t offset, loff_t len)
EXT4_I(inode)->i_disksize += len;
ret = ext4_mark_inode_dirty(handle, inode);
if (ret)
- goto out_stop;
+ goto out_handle;
+
+ start_lblk = offset >> inode->i_blkbits;
+ len_lblk = len >> inode->i_blkbits;
down_write(&EXT4_I(inode)->i_data_sem);
ext4_discard_preallocations(inode);
- path = ext4_find_extent(inode, offset_lblk, NULL, 0);
+ path = ext4_find_extent(inode, start_lblk, NULL, 0);
if (IS_ERR(path)) {
up_write(&EXT4_I(inode)->i_data_sem);
- goto out_stop;
+ goto out_handle;
}
depth = ext_depth(inode);
@@ -5492,16 +5486,16 @@ static int ext4_insert_range(struct file *file, loff_t offset, loff_t len)
ee_len = ext4_ext_get_actual_len(extent);
/*
- * If offset_lblk is not the starting block of extent, split
- * the extent @offset_lblk
+ * If start_lblk is not the starting block of extent, split
+ * the extent @start_lblk
*/
- if ((offset_lblk > ee_start_lblk) &&
- (offset_lblk < (ee_start_lblk + ee_len))) {
+ if ((start_lblk > ee_start_lblk) &&
+ (start_lblk < (ee_start_lblk + ee_len))) {
if (ext4_ext_is_unwritten(extent))
split_flag = EXT4_EXT_MARK_UNWRIT1 |
EXT4_EXT_MARK_UNWRIT2;
ret = ext4_split_extent_at(handle, inode, &path,
- offset_lblk, split_flag,
+ start_lblk, split_flag,
EXT4_EX_NOCACHE |
EXT4_GET_BLOCKS_PRE_IO |
EXT4_GET_BLOCKS_METADATA_NOFAIL);
@@ -5510,32 +5504,33 @@ static int ext4_insert_range(struct file *file, loff_t offset, loff_t len)
ext4_free_ext_path(path);
if (ret < 0) {
up_write(&EXT4_I(inode)->i_data_sem);
- goto out_stop;
+ goto out_handle;
}
} else {
ext4_free_ext_path(path);
}
- ext4_es_remove_extent(inode, offset_lblk, EXT_MAX_BLOCKS - offset_lblk);
+ ext4_es_remove_extent(inode, start_lblk, EXT_MAX_BLOCKS - start_lblk);
/*
- * if offset_lblk lies in a hole which is at start of file, use
+ * if start_lblk lies in a hole which is at start of file, use
* ee_start_lblk to shift extents
*/
ret = ext4_ext_shift_extents(inode, handle,
- max(ee_start_lblk, offset_lblk), len_lblk, SHIFT_RIGHT);
-
+ max(ee_start_lblk, start_lblk), len_lblk, SHIFT_RIGHT);
up_write(&EXT4_I(inode)->i_data_sem);
+ if (ret)
+ goto out_handle;
+
+ ext4_update_inode_fsync_trans(handle, inode, 1);
if (IS_SYNC(inode))
ext4_handle_sync(handle);
- if (ret >= 0)
- ext4_update_inode_fsync_trans(handle, inode, 1);
-out_stop:
+out_handle:
ext4_journal_stop(handle);
-out_mmap:
+out_invalidate_lock:
filemap_invalidate_unlock(mapping);
-out_mutex:
+out:
inode_unlock(inode);
return ret;
}
--
2.39.2
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