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Message-ID: <Z2Khk0kU4THoUEbs@li-bb2b2a4c-3307-11b2-a85c-8fa5c3a69313.ibm.com>
Date: Wed, 18 Dec 2024 15:48:59 +0530
From: Ojaswin Mujoo <ojaswin@...ux.ibm.com>
To: Zhang Yi <yi.zhang@...weicloud.com>
Cc: linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
linux-kernel@...r.kernel.org, tytso@....edu, adilger.kernel@...ger.ca,
jack@...e.cz, yi.zhang@...wei.com, chengzhihao1@...wei.com,
yukuai3@...wei.com, yangerkun@...wei.com
Subject: Re: [PATCH v4 08/10] ext4: factor out ext4_do_fallocate()
On Mon, Dec 16, 2024 at 09:39:13AM +0800, Zhang Yi wrote:
> From: Zhang Yi <yi.zhang@...wei.com>
>
> Now the real job of normal fallocate are open coded in ext4_fallocate(),
> factor out a new helper ext4_do_fallocate() to do the real job, like
> others functions (e.g. ext4_zero_range()) in ext4_fallocate() do, this
> can make the code more clear, no functional changes.
>
> Signed-off-by: Zhang Yi <yi.zhang@...wei.com>
> Reviewed-by: Jan Kara <jack@...e.cz>
Looks good, feel free to add:
Reviewed-by: Ojaswin Mujoo <ojaswin@...ux.ibm.com>
> ---
> fs/ext4/extents.c | 125 ++++++++++++++++++++++------------------------
> 1 file changed, 60 insertions(+), 65 deletions(-)
>
> diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
> index be44dd7aacdb..a8bbbf8a9950 100644
> --- a/fs/ext4/extents.c
> +++ b/fs/ext4/extents.c
> @@ -4689,6 +4689,58 @@ static long ext4_zero_range(struct file *file, loff_t offset,
> return ret;
> }
>
> +static long ext4_do_fallocate(struct file *file, loff_t offset,
> + loff_t len, int mode)
> +{
> + struct inode *inode = file_inode(file);
> + loff_t end = offset + len;
> + loff_t new_size = 0;
> + ext4_lblk_t start_lblk, len_lblk;
> + int ret;
> +
> + trace_ext4_fallocate_enter(inode, offset, len, mode);
> +
> + start_lblk = offset >> inode->i_blkbits;
> + len_lblk = EXT4_MAX_BLOCKS(len, offset, inode->i_blkbits);
> +
> + inode_lock(inode);
> +
> + /* We only support preallocation for extent-based files only. */
> + if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) {
> + ret = -EOPNOTSUPP;
> + goto out;
> + }
> +
> + if (!(mode & FALLOC_FL_KEEP_SIZE) &&
> + (end > inode->i_size || end > EXT4_I(inode)->i_disksize)) {
> + new_size = end;
> + ret = inode_newsize_ok(inode, new_size);
> + if (ret)
> + goto out;
> + }
> +
> + /* Wait all existing dio workers, newcomers will block on i_rwsem */
> + inode_dio_wait(inode);
> +
> + ret = file_modified(file);
> + if (ret)
> + goto out;
> +
> + ret = ext4_alloc_file_blocks(file, start_lblk, len_lblk, new_size,
> + EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT);
> + if (ret)
> + goto out;
> +
> + if (file->f_flags & O_SYNC && EXT4_SB(inode->i_sb)->s_journal) {
> + ret = ext4_fc_commit(EXT4_SB(inode->i_sb)->s_journal,
> + EXT4_I(inode)->i_sync_tid);
> + }
> +out:
> + inode_unlock(inode);
> + trace_ext4_fallocate_exit(inode, offset, len_lblk, ret);
> + return ret;
> +}
> +
> /*
> * preallocate space for a file. This implements ext4's fallocate file
> * operation, which gets called from sys_fallocate system call.
> @@ -4699,12 +4751,7 @@ static long ext4_zero_range(struct file *file, loff_t offset,
> long ext4_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
> {
> struct inode *inode = file_inode(file);
> - loff_t new_size = 0;
> - unsigned int max_blocks;
> - int ret = 0;
> - int flags;
> - ext4_lblk_t lblk;
> - unsigned int blkbits = inode->i_blkbits;
> + int ret;
>
> /*
> * Encrypted inodes can't handle collapse range or insert
> @@ -4726,71 +4773,19 @@ long ext4_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
> ret = ext4_convert_inline_data(inode);
> inode_unlock(inode);
> if (ret)
> - goto exit;
> + return ret;
>
> - if (mode & FALLOC_FL_PUNCH_HOLE) {
> + if (mode & FALLOC_FL_PUNCH_HOLE)
> ret = ext4_punch_hole(file, offset, len);
> - goto exit;
> - }
> -
> - if (mode & FALLOC_FL_COLLAPSE_RANGE) {
> + else if (mode & FALLOC_FL_COLLAPSE_RANGE)
> ret = ext4_collapse_range(file, offset, len);
> - goto exit;
> - }
> -
> - if (mode & FALLOC_FL_INSERT_RANGE) {
> + else if (mode & FALLOC_FL_INSERT_RANGE)
> ret = ext4_insert_range(file, offset, len);
> - goto exit;
> - }
> -
> - if (mode & FALLOC_FL_ZERO_RANGE) {
> + else if (mode & FALLOC_FL_ZERO_RANGE)
> ret = ext4_zero_range(file, offset, len, mode);
> - goto exit;
> - }
> - trace_ext4_fallocate_enter(inode, offset, len, mode);
> - lblk = offset >> blkbits;
> -
> - max_blocks = EXT4_MAX_BLOCKS(len, offset, blkbits);
> - flags = EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT;
> -
> - inode_lock(inode);
> -
> - /*
> - * We only support preallocation for extent-based files only
> - */
> - if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) {
> - ret = -EOPNOTSUPP;
> - goto out;
> - }
> -
> - if (!(mode & FALLOC_FL_KEEP_SIZE) &&
> - (offset + len > inode->i_size ||
> - offset + len > EXT4_I(inode)->i_disksize)) {
> - new_size = offset + len;
> - ret = inode_newsize_ok(inode, new_size);
> - if (ret)
> - goto out;
> - }
> -
> - /* Wait all existing dio workers, newcomers will block on i_rwsem */
> - inode_dio_wait(inode);
> -
> - ret = file_modified(file);
> - if (ret)
> - goto out;
> -
> - ret = ext4_alloc_file_blocks(file, lblk, max_blocks, new_size, flags);
> - if (ret)
> - goto out;
> + else
> + ret = ext4_do_fallocate(file, offset, len, mode);
>
> - if (file->f_flags & O_SYNC && EXT4_SB(inode->i_sb)->s_journal) {
> - ret = ext4_fc_commit(EXT4_SB(inode->i_sb)->s_journal,
> - EXT4_I(inode)->i_sync_tid);
> - }
> -out:
> - inode_unlock(inode);
> - trace_ext4_fallocate_exit(inode, offset, max_blocks, ret);
> -exit:
> return ret;
> }
>
> --
> 2.46.1
>
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