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block: replace fmode_t with a block-specific type for block open flags

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The only overlap between the block open flags mapped into the fmode_t and
other uses of fmode_t are FMODE_READ and FMODE_WRITE.  Define a new
blk_mode_t instead for use in blkdev_get_by_{dev,path}, ->open and
->ioctl and stop abusing fmode_t.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Jack Wang <jinpu.wang@ionos.com>		[rnbd]
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Christian Brauner <brauner@kernel.org>
Link: https://lore.kernel.org/r/20230608110258.189493-28-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig
2023-06-08 13:02:55 +02:00
committed by Jens Axboe
parent 5e4ea83467
commit 05bdb99653
82 changed files with 334 additions and 315 deletions
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30
include/linux/blkdev.h
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@@ -112,6 +112,19 @@ struct blk_integrity {
unsigned char tag_size;
};
typedef unsigned int __bitwise blk_mode_t;
/* open for reading */
#define BLK_OPEN_READ ((__force blk_mode_t)(1 << 0))
/* open for writing */
#define BLK_OPEN_WRITE ((__force blk_mode_t)(1 << 1))
/* open exclusively (vs other exclusive openers */
#define BLK_OPEN_EXCL ((__force blk_mode_t)(1 << 2))
/* opened with O_NDELAY */
#define BLK_OPEN_NDELAY ((__force blk_mode_t)(1 << 3))
/* open for "writes" only for ioctls (specialy hack for floppy.c) */
#define BLK_OPEN_WRITE_IOCTL ((__force blk_mode_t)(1 << 4))
struct gendisk {
/*
* major/first_minor/minors should not be set by any new driver, the
@@ -187,6 +200,7 @@ struct gendisk {
struct badblocks *bb;
struct lockdep_map lockdep_map;
u64 diskseq;
blk_mode_t open_mode;
/*
* Independent sector access ranges. This is always NULL for
@@ -1363,10 +1377,12 @@ struct block_device_operations {
void (*submit_bio)(struct bio *bio);
int (*poll_bio)(struct bio *bio, struct io_comp_batch *iob,
unsigned int flags);
int (*open)(struct gendisk *disk, fmode_t mode);
int (*open)(struct gendisk *disk, blk_mode_t mode);
void (*release)(struct gendisk *disk);
int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
int (*ioctl)(struct block_device *bdev, blk_mode_t mode,
unsigned cmd, unsigned long arg);
int (*compat_ioctl)(struct block_device *bdev, blk_mode_t mode,
unsigned cmd, unsigned long arg);
unsigned int (*check_events) (struct gendisk *disk,
unsigned int clearing);
void (*unlock_native_capacity) (struct gendisk *);
@@ -1393,7 +1409,7 @@ struct block_device_operations {
};
#ifdef CONFIG_COMPAT
extern int blkdev_compat_ptr_ioctl(struct block_device *, fmode_t,
extern int blkdev_compat_ptr_ioctl(struct block_device *, blk_mode_t,
unsigned int, unsigned long);
#else
#define blkdev_compat_ptr_ioctl NULL
@@ -1455,11 +1471,11 @@ struct blk_holder_ops {
* as stored in sb->s_flags.
*/
#define sb_open_mode(flags) \
(FMODE_READ | (((flags) & SB_RDONLY) ? 0 : FMODE_WRITE))
(BLK_OPEN_READ | (((flags) & SB_RDONLY) ? 0 : BLK_OPEN_WRITE))
struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder,
struct block_device *blkdev_get_by_dev(dev_t dev, blk_mode_t mode, void *holder,
const struct blk_holder_ops *hops);
struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,
struct block_device *blkdev_get_by_path(const char *path, blk_mode_t mode,
void *holder, const struct blk_holder_ops *hops);
int bd_prepare_to_claim(struct block_device *bdev, void *holder,
const struct blk_holder_ops *hops);