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btrfs-progs: refactor find_free_dev_extent_start()

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Factor out the function dev_extent_search_start() from
find_free_dev_extent_start() to decide the starting position of a device
extent search.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Naohiro Aota 2021-04-06 17:05:44 +09:00 committed by David Sterba
parent 1da9fede64
commit ff65b83306
1 changed files with 16 additions and 8 deletions
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24
kernel-shared/volumes.c
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@ -444,6 +444,21 @@ int btrfs_scan_one_device(int fd, const char *path,
return ret;
}
static u64 dev_extent_search_start(struct btrfs_device *device, u64 start)
{
switch (device->fs_devices->chunk_alloc_policy) {
case BTRFS_CHUNK_ALLOC_REGULAR:
/*
* We don't want to overwrite the superblock on the drive nor
* any area used by the boot loader (grub for example), so we
* make sure to start at an offset of at least 1MB.
*/
return max(start, BTRFS_BLOCK_RESERVED_1M_FOR_SUPER);
default:
BUG();
}
}
/*
* find_free_dev_extent_start - find free space in the specified device
* @device: the device which we search the free space in
@ -481,15 +496,8 @@ static int find_free_dev_extent_start(struct btrfs_device *device,
int ret;
int slot;
struct extent_buffer *l;
u64 min_search_start;
/*
* We don't want to overwrite the superblock on the drive nor any area
* used by the boot loader (grub for example), so we make sure to start
* at an offset of at least 1MB.
*/
min_search_start = BTRFS_BLOCK_RESERVED_1M_FOR_SUPER;
search_start = max(search_start, min_search_start);
search_start = dev_extent_search_start(device, search_start);
path = btrfs_alloc_path();
if (!path)