Re: [PATCH 6.1.y 1/2] exfat: support dynamic allocate bh for exfat_entry_set_cache

[Sasha Levin <sashal@kernel.org>]

[ Sasha's backport helper bot ]

Hi,

The upstream commit SHA1 provided is correct: a3ff29a95fde16906304455aa8c0bd84eb770258

WARNING: Author mismatch between patch and upstream commit:
Backport author: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>
Commit author: Yuezhang Mo <Yuezhang.Mo@sony.com>


Status in newer kernel trees:
6.12.y | Present (exact SHA1)
6.6.y | Present (exact SHA1)
6.1.y | Not found

Note: The patch differs from the upstream commit:
---
1:  a3ff29a95fde ! 1:  bb39fa77df0f exfat: support dynamic allocate bh for exfat_entry_set_cache
    @@ Metadata
      ## Commit message ##
         exfat: support dynamic allocate bh for exfat_entry_set_cache
     
    +    [ Upstream commit a3ff29a95fde16906304455aa8c0bd84eb770258 ]
    +
         In special cases, a file or a directory may occupied more than 19
         directory entries, pre-allocating 3 bh is not enough. Such as
           - Support vendor secondary directory entry in the future.
    @@ Commit message
         Reviewed-by: Aoyama Wataru <wataru.aoyama@sony.com>
         Reviewed-by: Sungjong Seo <sj1557.seo@samsung.com>
         Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
    +    (cherry picked from commit a3ff29a95fde16906304455aa8c0bd84eb770258)
    +    [Harshit: Backport - clean cherry-pick to 6.1.y]
    +    Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>
     
      ## fs/exfat/dir.c ##
     @@ fs/exfat/dir.c: int exfat_free_dentry_set(struct exfat_entry_set_cache *es, int sync)
    @@ fs/exfat/dir.c: struct exfat_entry_set_cache *exfat_get_dentry_set(struct super_
     
      ## fs/exfat/exfat_fs.h ##
     @@ fs/exfat/exfat_fs.h: struct exfat_entry_set_cache {
    - 	struct super_block *sb;
    + 	bool modified;
      	unsigned int start_off;
      	int num_bh;
     -	struct buffer_head *bh[DIR_CACHE_SIZE];
     +	struct buffer_head *__bh[DIR_CACHE_SIZE];
     +	struct buffer_head **bh;
      	unsigned int num_entries;
    - 	bool modified;
      };
      
     +#define IS_DYNAMIC_ES(es)	((es)->__bh != (es)->bh)
---

Results of testing on various branches:

| Branch                    | Patch Apply | Build Test |
|---------------------------|-------------|------------|
| stable/linux-6.1.y        |  Success    |  Success   |