diff options
| author | Christoph Hellwig <hch@lst.de> | 2023-08-01 20:22:01 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2023-08-02 18:13:09 +0300 |
| commit | 925c86a19bacf8ce10eb666328fb3fa5aff7b951 (patch) | |
| tree | e5724b45449d43a6a695ff2ff0a1276e70a7ccf7 /include/linux/iomap.h | |
| parent | 487c607df790d366e67a7d6a30adf785cdd98e55 (diff) | |
| download | linux-925c86a19bacf8ce10eb666328fb3fa5aff7b951.tar.xz | |
fs: add CONFIG_BUFFER_HEAD
Add a new config option that controls building the buffer_head code, and
select it from all file systems and stacking drivers that need it.
For the block device nodes and alternative iomap based buffered I/O path
is provided when buffer_head support is not enabled, and iomap needs a
a small tweak to define the IOMAP_F_BUFFER_HEAD flag to 0 to not call
into the buffer_head code when it doesn't exist.
Otherwise this is just Kconfig and ifdef changes.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Link: https://lore.kernel.org/r/20230801172201.1923299-7-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/linux/iomap.h')
| -rw-r--r-- | include/linux/iomap.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/iomap.h b/include/linux/iomap.h index e2b836c2e119..54f50d34fd9d 100644 --- a/include/linux/iomap.h +++ b/include/linux/iomap.h @@ -58,7 +58,11 @@ struct vm_fault; #define IOMAP_F_DIRTY (1U << 1) #define IOMAP_F_SHARED (1U << 2) #define IOMAP_F_MERGED (1U << 3) +#ifdef CONFIG_BUFFER_HEAD #define IOMAP_F_BUFFER_HEAD (1U << 4) +#else +#define IOMAP_F_BUFFER_HEAD 0 +#endif /* CONFIG_BUFFER_HEAD */ #define IOMAP_F_XATTR (1U << 5) /* |