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init: improve the name_to_dev_t interface

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name_to_dev_t has a very misleading name, that doesn't make clear
it should only be used by the early init code, and also has a bad
calling convention that doesn't allow returning different kinds of
errors.  Rename it to early_lookup_bdev to make the use case clear,
and return an errno, where -EINVAL means the string could not be
parsed, and -ENODEV means it the string was valid, but there was
no device found for it.

Also stub out the whole call for !CONFIG_BLOCK as all the non-block
root cases are always covered in the caller.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20230531125535.676098-14-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig
2023-05-31 14:55:24 +02:00
committed by Jens Axboe
parent c0c1a7dcb6
commit cf056a4312
9 changed files with 74 additions and 75 deletions
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5
include/linux/blkdev.h
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@@ -1501,6 +1501,7 @@ int sync_blockdev_nowait(struct block_device *bdev);
void sync_bdevs(bool wait);
void bdev_statx_dioalign(struct inode *inode, struct kstat *stat);
void printk_all_partitions(void);
int early_lookup_bdev(const char *pathname, dev_t *dev);
#else
static inline void invalidate_bdev(struct block_device *bdev)
{
@@ -1522,6 +1523,10 @@ static inline void bdev_statx_dioalign(struct inode *inode, struct kstat *stat)
static inline void printk_all_partitions(void)
{
}
static inline int early_lookup_bdev(const char *pathname, dev_t *dev)
{
return -EINVAL;
}
#endif /* CONFIG_BLOCK */
int fsync_bdev(struct block_device *bdev);