[f2fs-dev] [PATCH v3 1/2] f2fs: don't allow unaligned truncation to smaller/equal size on pinned file

[f2fs-dev] [PATCH v3 1/2] f2fs: don't allow unaligned truncation to smaller/equal size on pinned file

[wangzijie]

To prevent scattered pin block generation, don't allow non-section aligned truncation
to smaller or equal size on pinned file. But for truncation to larger size, after
commit 3fdd89b452c2("f2fs: prevent writing without fallocate() for pinned files"),
we only support overwrite IO to pinned file, so we don't need to consider
attr->ia_size > i_size case.

Signed-off-by: wangzijie <wangzijie1@honor.com>
---
v3:
- cover attr->ia_size == i_size case
v2:
- add comments and change a proper subject
---
 fs/f2fs/file.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 6bd3de64f..9e0f1c98f 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -1026,6 +1026,7 @@ int f2fs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
 {
 	struct inode *inode = d_inode(dentry);
 	struct f2fs_inode_info *fi = F2FS_I(inode);
+	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 	int err;
 
 	if (unlikely(f2fs_cp_error(F2FS_I_SB(inode))))
@@ -1047,6 +1048,17 @@ int f2fs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
 			!IS_ALIGNED(attr->ia_size,
 			F2FS_BLK_TO_BYTES(fi->i_cluster_size)))
 			return -EINVAL;
+		/*
+		 * To prevent scattered pin block generation, we don't allow
+		 * smaller/equal size unaligned truncation for pinned file.
+		 * We only support overwrite IO to pinned file, so don't
+		 * care about larger size truncation.
+		 */
+		if (f2fs_is_pinned_file(inode) &&
+			attr->ia_size <= i_size_read(inode) &&
+			!IS_ALIGNED(attr->ia_size,
+			F2FS_BLK_TO_BYTES(CAP_BLKS_PER_SEC(sbi))))
+			return -EINVAL;
 	}
 
 	err = setattr_prepare(idmap, dentry, attr);
-- 
2.25.1

[f2fs-dev] [PATCH v3 2/2] f2fs: cleanup F2FS_I_SB in f2fs_setattr()

[wangzijie]

After introduce sbi in f2fs_setattr(), cleanup F2FS_I_SB. No logic change.

Signed-off-by: wangzijie <wangzijie1@honor.com>
---
 fs/f2fs/file.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 9e0f1c98f..4809f0fd6 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -1029,7 +1029,7 @@ int f2fs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
 	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 	int err;
 
-	if (unlikely(f2fs_cp_error(F2FS_I_SB(inode))))
+	if (unlikely(f2fs_cp_error(sbi)))
 		return -EIO;
 
 	if (unlikely(IS_IMMUTABLE(inode)))
@@ -1080,12 +1080,11 @@ int f2fs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
 	}
 	if (i_uid_needs_update(idmap, attr, inode) ||
 	    i_gid_needs_update(idmap, attr, inode)) {
-		f2fs_lock_op(F2FS_I_SB(inode));
+		f2fs_lock_op(sbi);
 		err = dquot_transfer(idmap, inode, attr);
 		if (err) {
-			set_sbi_flag(F2FS_I_SB(inode),
-					SBI_QUOTA_NEED_REPAIR);
-			f2fs_unlock_op(F2FS_I_SB(inode));
+			set_sbi_flag(sbi, SBI_QUOTA_NEED_REPAIR);
+			f2fs_unlock_op(sbi);
 			return err;
 		}
 		/*
@@ -1095,7 +1094,7 @@ int f2fs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
 		i_uid_update(idmap, attr, inode);
 		i_gid_update(idmap, attr, inode);
 		f2fs_mark_inode_dirty_sync(inode, true);
-		f2fs_unlock_op(F2FS_I_SB(inode));
+		f2fs_unlock_op(sbi);
 	}
 
 	if (attr->ia_valid & ATTR_SIZE) {
@@ -1156,7 +1155,7 @@ int f2fs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
 	f2fs_mark_inode_dirty_sync(inode, true);
 
 	/* inode change will produce dirty node pages flushed by checkpoint */
-	f2fs_balance_fs(F2FS_I_SB(inode), true);
+	f2fs_balance_fs(sbi, true);
 
 	return err;
 }
-- 
2.25.1

Re: [f2fs-dev] [PATCH v3 1/2] f2fs: don't allow unaligned truncation to smaller/equal size on pinned file

[Jaegeuk Kim]

Hi,

Please do sbi conversion first, and apply this change.

On 06/18, wangzijie wrote:
> To prevent scattered pin block generation, don't allow non-section aligned truncation
> to smaller or equal size on pinned file. But for truncation to larger size, after
> commit 3fdd89b452c2("f2fs: prevent writing without fallocate() for pinned files"),
> we only support overwrite IO to pinned file, so we don't need to consider
> attr->ia_size > i_size case.
> 
> Signed-off-by: wangzijie <wangzijie1@honor.com>
> ---
> v3:
> - cover attr->ia_size == i_size case
> v2:
> - add comments and change a proper subject
> ---
>  fs/f2fs/file.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index 6bd3de64f..9e0f1c98f 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -1026,6 +1026,7 @@ int f2fs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
>  {
>  	struct inode *inode = d_inode(dentry);
>  	struct f2fs_inode_info *fi = F2FS_I(inode);
> +	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
>  	int err;
>  
>  	if (unlikely(f2fs_cp_error(F2FS_I_SB(inode))))
> @@ -1047,6 +1048,17 @@ int f2fs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
>  			!IS_ALIGNED(attr->ia_size,
>  			F2FS_BLK_TO_BYTES(fi->i_cluster_size)))
>  			return -EINVAL;
> +		/*
> +		 * To prevent scattered pin block generation, we don't allow
> +		 * smaller/equal size unaligned truncation for pinned file.
> +		 * We only support overwrite IO to pinned file, so don't
> +		 * care about larger size truncation.
> +		 */
> +		if (f2fs_is_pinned_file(inode) &&
> +			attr->ia_size <= i_size_read(inode) &&
> +			!IS_ALIGNED(attr->ia_size,
> +			F2FS_BLK_TO_BYTES(CAP_BLKS_PER_SEC(sbi))))
> +			return -EINVAL;
>  	}
>  
>  	err = setattr_prepare(idmap, dentry, attr);
> -- 
> 2.25.1