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Message-ID: <Y+a3a0eSkhVUh/RG@google.com>
Date: Fri, 10 Feb 2023 13:30:19 -0800
From: Jaegeuk Kim <jaegeuk@...nel.org>
To: Yangtao Li <frank.li@...o.com>
Cc: chao@...nel.org, linux-f2fs-devel@...ts.sourceforge.net,
linux-kernel@...r.kernel.org, hanqi@...o.com
Subject: Re: [PATCH] f2fs: fix to release compress file for
F2FS_IOC_RESERVE_COMPRESS_BLOCKS when has no space
On 02/10, Yangtao Li wrote:
> When the released file is reserving and the space is insufficient,
> the fsck flag is set incorrectly, and lead to the file cannot be
> reserved and released normally.
>
> $ mount -t f2fs -o compress_extension=*,compress_mode=user /mnt/9p/f2fs.img
> /mnt/f2fs/
> $ dd if=/dev/zero of=/mnt/f2fs/800M bs=1M count=800
> $ dd if=/dev/zero of=/mnt/f2fs/60M bs=1M count=60
> $ f2fs_io compress /mnt/f2fs/60M
> $ ./mnt/9p/my_f2fs_io release_cblocks /mnt/f2fs/60M
> 11520
> $ dd if=/dev/zero of=/mnt/f2fs/30M bs=1M count=30
> $ f2fs_io reserve_cblocks /mnt/f2fs/60M
> [ 56.399712] F2FS-fs (loop0): f2fs_reserve_compress_blocks: partial blocks
> were released i_ino=cf iblocks=76104, reserved=5220, compr_blocks=5655,
> run fsck to fix.
> F2FS_IOC_RESERVE_COMPRESS_BLOCKS failed: No space left on device
>
> $ ./mnt/9p/my_f2fs_io reserve_cblocks /mnt/f2fs/60M
> 0
> $ ./mnt/9p/my_f2fs_io release_cblocks /mnt/f2fs/60M
> F2FS_IOC_RELEASE_COMPRESS_BLOCKS failed: Invalid argument
>
> $ rm /mnt/f2fs/30M
> $ ./mnt/9p/my_f2fs_io reserve_cblocks /mnt/f2fs/60M
> 0
> $ ./mnt/9p/my_f2fs_io release_cblocks /mnt/f2fs/60M
> F2FS_IOC_RELEASE_COMPRESS_BLOCKS failed: Invalid argument
>
> In this case, let's release back the reserved part of the compressed file.
>
> Fixes: c75488fb4d82 ("f2fs: introduce F2FS_IOC_RESERVE_COMPRESS_BLOCKS")
> Signed-off-by: Qi Han <hanqi@...o.com>
> Signed-off-by: Yangtao Li <frank.li@...o.com>
> ---
> fs/f2fs/file.c | 97 ++++++++++++++++++++++++++++++++------------------
> 1 file changed, 63 insertions(+), 34 deletions(-)
>
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index 300eae8b5415..8f3f55ac153a 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -3427,11 +3427,52 @@ static int release_compress_blocks(struct dnode_of_data *dn, pgoff_t count)
> return released_blocks;
> }
>
> +static int f2fs_do_release_compress_blocks(struct inode *inode,
> + pgoff_t page_count, unsigned int *released_blocks)
> +{
> + pgoff_t page_idx = 0;
> + int ret;
> +
> + while (page_idx < page_count) {
> + struct dnode_of_data dn;
> + pgoff_t end_offset, count;
> +
> + set_new_dnode(&dn, inode, NULL, NULL, 0);
> + ret = f2fs_get_dnode_of_data(&dn, page_idx, LOOKUP_NODE);
> + if (ret) {
> + if (ret == -ENOENT) {
> + page_idx = f2fs_get_next_page_offset(&dn,
> + page_idx);
> + ret = 0;
> + continue;
> + }
> + break;
> + }
> +
> + end_offset = ADDRS_PER_PAGE(dn.node_page, inode);
> + count = min(end_offset - dn.ofs_in_node, page_count - page_idx);
> + count = round_up(count, F2FS_I(inode)->i_cluster_size);
> +
> + ret = release_compress_blocks(&dn, count);
> +
> + f2fs_put_dnode(&dn);
> +
> + if (ret < 0)
> + break;
> +
> + page_idx += count;
> + if (released_blocks)
> + *released_blocks += ret;
> + }
> +
> + return ret;
> +}
> +
> static int f2fs_release_compress_blocks(struct file *filp, unsigned long arg)
> {
> struct inode *inode = file_inode(filp);
> struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
> - pgoff_t page_idx = 0, last_idx;
> + pgoff_t last_idx;
> unsigned int released_blocks = 0;
> int ret;
> int writecount;
> @@ -3481,36 +3522,7 @@ static int f2fs_release_compress_blocks(struct file *filp, unsigned long arg)
>
> last_idx = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE);
>
> - while (page_idx < last_idx) {
> - struct dnode_of_data dn;
> - pgoff_t end_offset, count;
> -
> - set_new_dnode(&dn, inode, NULL, NULL, 0);
> - ret = f2fs_get_dnode_of_data(&dn, page_idx, LOOKUP_NODE);
> - if (ret) {
> - if (ret == -ENOENT) {
> - page_idx = f2fs_get_next_page_offset(&dn,
> - page_idx);
> - ret = 0;
> - continue;
> - }
> - break;
> - }
> -
> - end_offset = ADDRS_PER_PAGE(dn.node_page, inode);
> - count = min(end_offset - dn.ofs_in_node, last_idx - page_idx);
> - count = round_up(count, F2FS_I(inode)->i_cluster_size);
> -
> - ret = release_compress_blocks(&dn, count);
> -
> - f2fs_put_dnode(&dn);
> -
> - if (ret < 0)
> - break;
> -
> - page_idx += count;
> - released_blocks += ret;
> - }
> + ret = f2fs_do_release_compress_blocks(inode, last_idx, &released_blocks);
>
> filemap_invalidate_unlock(inode->i_mapping);
> f2fs_up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
> @@ -3585,8 +3597,22 @@ static int reserve_compress_blocks(struct dnode_of_data *dn, pgoff_t count)
> if (ret)
> return ret;
>
> - if (reserved != cluster_size - compr_blocks)
> - return -ENOSPC;
> + if (reserved != cluster_size - compr_blocks) {
> + dec_valid_block_count(sbi, dn->inode, reserved);
This looks breaking the consistency?
> +
> + for (i = cluster_size - 1; i > 0; i--) {
> + dn->ofs_in_node--;
> + blkaddr = f2fs_data_blkaddr(dn);
> +
> + if (__is_valid_data_blkaddr(blkaddr)) {
> + dn->ofs_in_node -= i;
> + return -ENOSPC;
> + }
> +
> + dn->data_blkaddr = NULL_ADDR;
> + f2fs_set_data_blkaddr(dn);
> + }
> + }
>
> f2fs_i_compr_blocks_update(dn->inode, compr_blocks, true);
>
> @@ -3604,6 +3630,7 @@ static int f2fs_reserve_compress_blocks(struct file *filp, unsigned long arg)
> struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
> pgoff_t page_idx = 0, last_idx;
> unsigned int reserved_blocks = 0;
> + struct dnode_of_data dn;
> int ret;
>
> if (!f2fs_sb_has_compression(F2FS_I_SB(inode)))
> @@ -3637,7 +3664,6 @@ static int f2fs_reserve_compress_blocks(struct file *filp, unsigned long arg)
> last_idx = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE);
>
> while (page_idx < last_idx) {
> - struct dnode_of_data dn;
> pgoff_t end_offset, count;
>
> set_new_dnode(&dn, inode, NULL, NULL, 0);
> @@ -3667,6 +3693,9 @@ static int f2fs_reserve_compress_blocks(struct file *filp, unsigned long arg)
> reserved_blocks += ret;
> }
>
> + if (ret == -ENOSPC)
> + f2fs_do_release_compress_blocks(inode, page_idx + dn.ofs_in_node, NULL);
> +
> filemap_invalidate_unlock(inode->i_mapping);
> f2fs_up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
>
> --
> 2.25.1
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