Re: [Jfs-discussion] [PATCH 07/28] ext4: call journal revoke when freeing ea_inode blocks

2017-05-31 Thread Darrick J. Wong
On Wed, May 31, 2017 at 01:14:56AM -0700, Tahsin Erdogan wrote:
> ea_inode contents are treated as metadata, that's why it is journaled
> during initial writes. Failing to call revoke during freeing could cause
> user data to be overwritten with original ea_inode contents during journal
> replay.
> 
> Signed-off-by: Tahsin Erdogan 
> ---
>  fs/ext4/extents.c  | 3 ++-
>  fs/ext4/indirect.c | 3 ++-
>  2 files changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
> index 3e36508610b7..e0a8425ff74d 100644
> --- a/fs/ext4/extents.c
> +++ b/fs/ext4/extents.c
> @@ -2488,7 +2488,8 @@ int ext4_ext_index_trans_blocks(struct inode *inode, 
> int extents)
>  
>  static inline int get_default_free_blocks_flags(struct inode *inode)
>  {
> - if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))
> + if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode) ||
> + ext4_test_inode_flag(inode, EXT4_INODE_EA_INODE))
>   return EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET;
>   else if (ext4_should_journal_data(inode))
>   return EXT4_FREE_BLOCKS_FORGET;
> diff --git a/fs/ext4/indirect.c b/fs/ext4/indirect.c
> index bc15c2c17633..7ffa290cbb8e 100644
> --- a/fs/ext4/indirect.c
> +++ b/fs/ext4/indirect.c
> @@ -829,7 +829,8 @@ static int ext4_clear_blocks(handle_t *handle, struct 
> inode *inode,
>   int flags = EXT4_FREE_BLOCKS_VALIDATED;
>   int err;
>  
> - if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))
> + if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode) ||
> + ext4_test_inode_flag(inode, EXT4_INODE_EA_INODE))

I appreciate the thoroughness of doing this even for blockmapped
ea_inode files, and I'm not complaining about this hunk at all. :)

However, please consider requiring the extents feature + format as a
prerequisite for ea_inodes.  ext4 has traditionally been very ...
permissive about supporting a diverse range of feature options, but the
cost of that diversity is that the feature support matrix that the
community has to support is already untestably large.

I think it would be wise not to support !extents && ea_inode,
particularly since blockmaps aren't protected by metadata_csum and so in
the long run it's probably best to minimize the introduction of new
blockmap files (on ext4 anyway).

--D

>   flags |= EXT4_FREE_BLOCKS_FORGET | EXT4_FREE_BLOCKS_METADATA;
>   else if (ext4_should_journal_data(inode))
>   flags |= EXT4_FREE_BLOCKS_FORGET;
> -- 
> 2.13.0.219.gdb65acc882-goog
> 

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[Jfs-discussion] [PATCH 07/28] ext4: call journal revoke when freeing ea_inode blocks

2017-05-31 Thread Tahsin Erdogan
ea_inode contents are treated as metadata, that's why it is journaled
during initial writes. Failing to call revoke during freeing could cause
user data to be overwritten with original ea_inode contents during journal
replay.

Signed-off-by: Tahsin Erdogan 
---
 fs/ext4/extents.c  | 3 ++-
 fs/ext4/indirect.c | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 3e36508610b7..e0a8425ff74d 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -2488,7 +2488,8 @@ int ext4_ext_index_trans_blocks(struct inode *inode, int 
extents)
 
 static inline int get_default_free_blocks_flags(struct inode *inode)
 {
-   if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))
+   if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode) ||
+   ext4_test_inode_flag(inode, EXT4_INODE_EA_INODE))
return EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET;
else if (ext4_should_journal_data(inode))
return EXT4_FREE_BLOCKS_FORGET;
diff --git a/fs/ext4/indirect.c b/fs/ext4/indirect.c
index bc15c2c17633..7ffa290cbb8e 100644
--- a/fs/ext4/indirect.c
+++ b/fs/ext4/indirect.c
@@ -829,7 +829,8 @@ static int ext4_clear_blocks(handle_t *handle, struct inode 
*inode,
int flags = EXT4_FREE_BLOCKS_VALIDATED;
int err;
 
-   if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))
+   if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode) ||
+   ext4_test_inode_flag(inode, EXT4_INODE_EA_INODE))
flags |= EXT4_FREE_BLOCKS_FORGET | EXT4_FREE_BLOCKS_METADATA;
else if (ext4_should_journal_data(inode))
flags |= EXT4_FREE_BLOCKS_FORGET;
-- 
2.13.0.219.gdb65acc882-goog


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