2024-03-12 20:49:53

by Daeho Jeong

Subject: [PATCH v2] f2fs: prevent writing without fallocate() for pinned files

From: Daeho Jeong <[email protected]>

In a case writing without fallocate(), we can't guarantee it's allocated
in the conventional area for zoned stroage.

Signed-off-by: Daeho Jeong <[email protected]>
---
v2: covered the direct io case
---
fs/f2fs/data.c | 14 ++++++++++++--
fs/f2fs/file.c | 4 ++++
2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index c21b92f18463..d3e5ab2736a6 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -1584,8 +1584,11 @@ int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map, int flag)

/* use out-place-update for direct IO under LFS mode */
if (map->m_may_create &&
- (is_hole || (f2fs_lfs_mode(sbi) && flag == F2FS_GET_BLOCK_DIO))) {
- if (unlikely(f2fs_cp_error(sbi))) {
+ (is_hole || (f2fs_lfs_mode(sbi) && flag == F2FS_GET_BLOCK_DIO &&
+ !f2fs_is_pinned_file(inode)))) {
+ if (unlikely(f2fs_cp_error(sbi)) ||
+ (f2fs_is_pinned_file(inode) && is_hole &&
+ flag != F2FS_GET_BLOCK_PRE_DIO)) {
err = -EIO;
goto sync_out;
}
@@ -3378,6 +3381,8 @@ static int prepare_write_begin(struct f2fs_sb_info *sbi,
f2fs_map_lock(sbi, flag);
locked = true;
} else if ((pos & PAGE_MASK) >= i_size_read(inode)) {
+ if (f2fs_is_pinned_file(inode))
+ return -EIO;
f2fs_map_lock(sbi, flag);
locked = true;
}
@@ -3407,6 +3412,11 @@ static int prepare_write_begin(struct f2fs_sb_info *sbi,

if (!f2fs_lookup_read_extent_cache_block(inode, index,
&dn.data_blkaddr)) {
+ if (f2fs_is_pinned_file(inode)) {
+ err = -EIO;
+ goto out;
+ }
+
if (locked) {
err = f2fs_reserve_block(&dn, index);
goto out;
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 82277e95c88f..f98730932fc4 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -4611,6 +4611,10 @@ static int f2fs_preallocate_blocks(struct kiocb *iocb, struct iov_iter *iter,
return ret;
}

+ /* For pinned files, it should be fallocate()-ed in advance. */
+ if (f2fs_is_pinned_file(inode))
+ return 0;
+
/* Do not preallocate blocks that will be written partially in 4KB. */
map.m_lblk = F2FS_BLK_ALIGN(pos);
map.m_len = F2FS_BYTES_TO_BLK(pos + count);
--
2.44.0.278.ge034bb2e1d-goog

2024-03-13 01:51:39

by Chao Yu

Subject: Re: [f2fs-dev] [PATCH v2] f2fs: prevent writing without fallocate() for pinned files

On 2024/3/13 4:49, Daeho Jeong wrote:
> From: Daeho Jeong <[email protected]>
>
> In a case writing without fallocate(), we can't guarantee it's allocated
> in the conventional area for zoned stroage.
>
> Signed-off-by: Daeho Jeong <[email protected]>
> ---
> v2: covered the direct io case

Oh, one more missed case, mkwrite?

Thanks,

> ---
> fs/f2fs/data.c | 14 ++++++++++++--
> fs/f2fs/file.c | 4 ++++
> 2 files changed, 16 insertions(+), 2 deletions(-)
>
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index c21b92f18463..d3e5ab2736a6 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -1584,8 +1584,11 @@ int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map, int flag)
>
> /* use out-place-update for direct IO under LFS mode */
> if (map->m_may_create &&
> - (is_hole || (f2fs_lfs_mode(sbi) && flag == F2FS_GET_BLOCK_DIO))) {
> - if (unlikely(f2fs_cp_error(sbi))) {
> + (is_hole || (f2fs_lfs_mode(sbi) && flag == F2FS_GET_BLOCK_DIO &&
> + !f2fs_is_pinned_file(inode)))) {
> + if (unlikely(f2fs_cp_error(sbi)) ||
> + (f2fs_is_pinned_file(inode) && is_hole &&
> + flag != F2FS_GET_BLOCK_PRE_DIO)) {
> err = -EIO;
> goto sync_out;
> }
> @@ -3378,6 +3381,8 @@ static int prepare_write_begin(struct f2fs_sb_info *sbi,
> f2fs_map_lock(sbi, flag);
> locked = true;
> } else if ((pos & PAGE_MASK) >= i_size_read(inode)) {
> + if (f2fs_is_pinned_file(inode))
> + return -EIO;
> f2fs_map_lock(sbi, flag);
> locked = true;
> }
> @@ -3407,6 +3412,11 @@ static int prepare_write_begin(struct f2fs_sb_info *sbi,
>
> if (!f2fs_lookup_read_extent_cache_block(inode, index,
> &dn.data_blkaddr)) {
> + if (f2fs_is_pinned_file(inode)) {
> + err = -EIO;
> + goto out;
> + }
> +
> if (locked) {
> err = f2fs_reserve_block(&dn, index);
> goto out;
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index 82277e95c88f..f98730932fc4 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -4611,6 +4611,10 @@ static int f2fs_preallocate_blocks(struct kiocb *iocb, struct iov_iter *iter,
> return ret;
> }
>
> + /* For pinned files, it should be fallocate()-ed in advance. */
> + if (f2fs_is_pinned_file(inode))
> + return 0;
> +
> /* Do not preallocate blocks that will be written partially in 4KB. */
> map.m_lblk = F2FS_BLK_ALIGN(pos);
> map.m_len = F2FS_BYTES_TO_BLK(pos + count);