2024-04-10 14:41:11

by Zhang Yi

Subject: [PATCH v4 01/34] ext4: factor out a common helper to query extent map

From: Zhang Yi <[email protected]>

Factor out a new common helper ext4_map_query_blocks() from the
ext4_da_map_blocks(), it query and return the extent map status on the
inode's extent path, no logic changes.

Signed-off-by: Zhang Yi <[email protected]>
---
fs/ext4/inode.c | 57 +++++++++++++++++++++++++++----------------------
1 file changed, 32 insertions(+), 25 deletions(-)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 537803250ca9..6a41172c06e1 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -453,6 +453,35 @@ static void ext4_map_blocks_es_recheck(handle_t *handle,
}
#endif /* ES_AGGRESSIVE_TEST */

+static int ext4_map_query_blocks(handle_t *handle, struct inode *inode,
+ struct ext4_map_blocks *map)
+{
+ unsigned int status;
+ int retval;
+
+ if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
+ retval = ext4_ext_map_blocks(handle, inode, map, 0);
+ else
+ retval = ext4_ind_map_blocks(handle, inode, map, 0);
+
+ if (retval <= 0)
+ return retval;
+
+ if (unlikely(retval != map->m_len)) {
+ ext4_warning(inode->i_sb,
+ "ES len assertion failed for inode "
+ "%lu: retval %d != map->m_len %d",
+ inode->i_ino, retval, map->m_len);
+ WARN_ON(1);
+ }
+
+ status = map->m_flags & EXT4_MAP_UNWRITTEN ?
+ EXTENT_STATUS_UNWRITTEN : EXTENT_STATUS_WRITTEN;
+ ext4_es_insert_extent(inode, map->m_lblk, map->m_len,
+ map->m_pblk, status);
+ return retval;
+}
+
/*
* The ext4_map_blocks() function tries to look up the requested blocks,
* and returns if the blocks are already mapped.
@@ -1744,33 +1773,11 @@ static int ext4_da_map_blocks(struct inode *inode, sector_t iblock,
down_read(&EXT4_I(inode)->i_data_sem);
if (ext4_has_inline_data(inode))
retval = 0;
- else if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
- retval = ext4_ext_map_blocks(NULL, inode, map, 0);
else
- retval = ext4_ind_map_blocks(NULL, inode, map, 0);
- if (retval < 0) {
- up_read(&EXT4_I(inode)->i_data_sem);
- return retval;
- }
- if (retval > 0) {
- unsigned int status;
-
- if (unlikely(retval != map->m_len)) {
- ext4_warning(inode->i_sb,
- "ES len assertion failed for inode "
- "%lu: retval %d != map->m_len %d",
- inode->i_ino, retval, map->m_len);
- WARN_ON(1);
- }
-
- status = map->m_flags & EXT4_MAP_UNWRITTEN ?
- EXTENT_STATUS_UNWRITTEN : EXTENT_STATUS_WRITTEN;
- ext4_es_insert_extent(inode, map->m_lblk, map->m_len,
- map->m_pblk, status);
- up_read(&EXT4_I(inode)->i_data_sem);
- return retval;
- }
+ retval = ext4_map_query_blocks(NULL, inode, map);
up_read(&EXT4_I(inode)->i_data_sem);
+ if (retval)
+ return retval;

add_delayed:
down_write(&EXT4_I(inode)->i_data_sem);
--
2.39.2

2024-04-26 11:55:46

by Ritesh Harjani

Subject: Re: [PATCH v4 01/34] ext4: factor out a common helper to query extent map

Zhang Yi <[email protected]> writes:

> From: Zhang Yi <[email protected]>
>
> Factor out a new common helper ext4_map_query_blocks() from the
> ext4_da_map_blocks(), it query and return the extent map status on the
> inode's extent path, no logic changes.
>
> Signed-off-by: Zhang Yi <[email protected]>
> ---
> fs/ext4/inode.c | 57 +++++++++++++++++++++++++++----------------------
> 1 file changed, 32 insertions(+), 25 deletions(-)

Looks good to me. Straight forward refactoring.
Feel free to add -

Reviewed-by: Ritesh Harjani (IBM) <[email protected]>

>
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index 537803250ca9..6a41172c06e1 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -453,6 +453,35 @@ static void ext4_map_blocks_es_recheck(handle_t *handle,
> }
> #endif /* ES_AGGRESSIVE_TEST */
>
> +static int ext4_map_query_blocks(handle_t *handle, struct inode *inode,
> + struct ext4_map_blocks *map)
> +{
> + unsigned int status;
> + int retval;
> +
> + if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
> + retval = ext4_ext_map_blocks(handle, inode, map, 0);
> + else
> + retval = ext4_ind_map_blocks(handle, inode, map, 0);
> +
> + if (retval <= 0)
> + return retval;
> +
> + if (unlikely(retval != map->m_len)) {
> + ext4_warning(inode->i_sb,
> + "ES len assertion failed for inode "
> + "%lu: retval %d != map->m_len %d",
> + inode->i_ino, retval, map->m_len);
> + WARN_ON(1);
> + }
> +
> + status = map->m_flags & EXT4_MAP_UNWRITTEN ?
> + EXTENT_STATUS_UNWRITTEN : EXTENT_STATUS_WRITTEN;
> + ext4_es_insert_extent(inode, map->m_lblk, map->m_len,
> + map->m_pblk, status);
> + return retval;
> +}
> +
> /*
> * The ext4_map_blocks() function tries to look up the requested blocks,
> * and returns if the blocks are already mapped.
> @@ -1744,33 +1773,11 @@ static int ext4_da_map_blocks(struct inode *inode, sector_t iblock,
> down_read(&EXT4_I(inode)->i_data_sem);
> if (ext4_has_inline_data(inode))
> retval = 0;
> - else if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
> - retval = ext4_ext_map_blocks(NULL, inode, map, 0);
> else
> - retval = ext4_ind_map_blocks(NULL, inode, map, 0);
> - if (retval < 0) {
> - up_read(&EXT4_I(inode)->i_data_sem);
> - return retval;
> - }
> - if (retval > 0) {
> - unsigned int status;
> -
> - if (unlikely(retval != map->m_len)) {
> - ext4_warning(inode->i_sb,
> - "ES len assertion failed for inode "
> - "%lu: retval %d != map->m_len %d",
> - inode->i_ino, retval, map->m_len);
> - WARN_ON(1);
> - }
> -
> - status = map->m_flags & EXT4_MAP_UNWRITTEN ?
> - EXTENT_STATUS_UNWRITTEN : EXTENT_STATUS_WRITTEN;
> - ext4_es_insert_extent(inode, map->m_lblk, map->m_len,
> - map->m_pblk, status);
> - up_read(&EXT4_I(inode)->i_data_sem);
> - return retval;
> - }
> + retval = ext4_map_query_blocks(NULL, inode, map);
> up_read(&EXT4_I(inode)->i_data_sem);
> + if (retval)
> + return retval;
>
> add_delayed:
> down_write(&EXT4_I(inode)->i_data_sem);
> --
> 2.39.2