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btrfs: merge btrfs_find_device and find_device

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commit 09ba3bc9dd150457c506e4661380a6183af651c1 upstream.

Both btrfs_find_device() and find_device() does the same thing except
that the latter does not take the seed device onto account in the device
scanning context. We can merge them.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
[4.19.y backport notes:
Vikash : - To apply this patch, a portion of commit e4319cd9cace
           was used to change the first argument of function
           "btrfs_find_device" from "struct btrfs_fs_info" to
           "struct btrfs_fs_devices".
Signed-off-by: Vikash Bansal <bvikas@vmware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Anand Jain 2019-01-19 14:48:55 +08:00 committed by Greg Kroah-Hartman
parent e18590b3e2
commit 8cb9b069fa
5 changed files with 53 additions and 52 deletions
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8
fs/btrfs/dev-replace.c
View file

@ -112,11 +112,11 @@ int btrfs_init_dev_replace(struct btrfs_fs_info *fs_info)
break;
case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
dev_replace->srcdev = btrfs_find_device(fs_info, src_devid,
NULL, NULL);
dev_replace->tgtdev = btrfs_find_device(fs_info,
dev_replace->srcdev = btrfs_find_device(fs_info->fs_devices,
src_devid, NULL, NULL, true);
dev_replace->tgtdev = btrfs_find_device(fs_info->fs_devices,
BTRFS_DEV_REPLACE_DEVID,
NULL, NULL);
NULL, NULL, true);
/*
* allow 'btrfs dev replace_cancel' if src/tgt device is
* missing

5
fs/btrfs/ioctl.c
View file

@ -1642,7 +1642,7 @@ static noinline int btrfs_ioctl_resize(struct file *file,
btrfs_info(fs_info, "resizing devid %llu", devid);
}
device = btrfs_find_device(fs_info, devid, NULL, NULL);
device = btrfs_find_device(fs_info->fs_devices, devid, NULL, NULL, true);
if (!device) {
btrfs_info(fs_info, "resizer unable to find device %llu",
devid);
@ -3178,7 +3178,8 @@ static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info,
s_uuid = di_args->uuid;
rcu_read_lock();
dev = btrfs_find_device(fs_info, di_args->devid, s_uuid, NULL);
dev = btrfs_find_device(fs_info->fs_devices, di_args->devid, s_uuid,
NULL, true);
if (!dev) {
ret = -ENODEV;

4
fs/btrfs/scrub.c
View file

@ -3835,7 +3835,7 @@ int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
return PTR_ERR(sctx);
mutex_lock(&fs_info->fs_devices->device_list_mutex);
dev = btrfs_find_device(fs_info, devid, NULL, NULL);
dev = btrfs_find_device(fs_info->fs_devices, devid, NULL, NULL, true);
if (!dev || (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state) &&
!is_dev_replace)) {
mutex_unlock(&fs_info->fs_devices->device_list_mutex);
@ -4019,7 +4019,7 @@ int btrfs_scrub_progress(struct btrfs_fs_info *fs_info, u64 devid,
struct scrub_ctx *sctx = NULL;
mutex_lock(&fs_info->fs_devices->device_list_mutex);
dev = btrfs_find_device(fs_info, devid, NULL, NULL);
dev = btrfs_find_device(fs_info->fs_devices, devid, NULL, NULL, true);
if (dev)
sctx = dev->scrub_ctx;
if (sctx)

84
fs/btrfs/volumes.c
View file

@ -347,27 +347,6 @@ static struct btrfs_device *__alloc_device(void)
return dev;
}
/*
* Find a device specified by @devid or @uuid in the list of @fs_devices, or
* return NULL.
*
* If devid and uuid are both specified, the match must be exact, otherwise
* only devid is used.
*/
static struct btrfs_device *find_device(struct btrfs_fs_devices *fs_devices,
u64 devid, const u8 *uuid)
{
struct btrfs_device *dev;
list_for_each_entry(dev, &fs_devices->devices, dev_list) {
if (dev->devid == devid &&
(!uuid || !memcmp(dev->uuid, uuid, BTRFS_UUID_SIZE))) {
return dev;
}
}
return NULL;
}
static noinline struct btrfs_fs_devices *find_fsid(u8 *fsid)
{
struct btrfs_fs_devices *fs_devices;
@ -772,8 +751,8 @@ static noinline struct btrfs_device *device_list_add(const char *path,
device = NULL;
} else {
mutex_lock(&fs_devices->device_list_mutex);
device = find_device(fs_devices, devid,
disk_super->dev_item.uuid);
device = btrfs_find_device(fs_devices, devid,
disk_super->dev_item.uuid, NULL, false);
}
if (!device) {
@ -2144,7 +2123,8 @@ static int btrfs_find_device_by_path(struct btrfs_fs_info *fs_info,
disk_super = (struct btrfs_super_block *)bh->b_data;
devid = btrfs_stack_device_id(&disk_super->dev_item);
dev_uuid = disk_super->dev_item.uuid;
*device = btrfs_find_device(fs_info, devid, dev_uuid, disk_super->fsid);
*device = btrfs_find_device(fs_info->fs_devices, devid, dev_uuid,
disk_super->fsid, true);
brelse(bh);
if (!*device)
ret = -ENOENT;
@ -2190,7 +2170,8 @@ int btrfs_find_device_by_devspec(struct btrfs_fs_info *fs_info, u64 devid,
if (devid) {
ret = 0;
*device = btrfs_find_device(fs_info, devid, NULL, NULL);
*device = btrfs_find_device(fs_info->fs_devices, devid,
NULL, NULL, true);
if (!*device)
ret = -ENOENT;
} else {
@ -2322,7 +2303,8 @@ static int btrfs_finish_sprout(struct btrfs_trans_handle *trans,
BTRFS_UUID_SIZE);
read_extent_buffer(leaf, fs_uuid, btrfs_device_fsid(dev_item),
BTRFS_FSID_SIZE);
device = btrfs_find_device(fs_info, devid, dev_uuid, fs_uuid);
device = btrfs_find_device(fs_info->fs_devices, devid, dev_uuid,
fs_uuid, true);
BUG_ON(!device); /* Logic error */
if (device->fs_devices->seeding) {
@ -6254,21 +6236,36 @@ blk_status_t btrfs_map_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
return BLK_STS_OK;
}
struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid,
u8 *uuid, u8 *fsid)
/*
* Find a device specified by @devid or @uuid in the list of @fs_devices, or
* return NULL.
*
* If devid and uuid are both specified, the match must be exact, otherwise
* only devid is used.
*
* If @seed is true, traverse through the seed devices.
*/
struct btrfs_device *btrfs_find_device(struct btrfs_fs_devices *fs_devices,
u64 devid, u8 *uuid, u8 *fsid,
bool seed)
{
struct btrfs_device *device;
struct btrfs_fs_devices *cur_devices;
cur_devices = fs_info->fs_devices;
while (cur_devices) {
while (fs_devices) {
if (!fsid ||
!memcmp(cur_devices->fsid, fsid, BTRFS_FSID_SIZE)) {
device = find_device(cur_devices, devid, uuid);
if (device)
return device;
!memcmp(fs_devices->fsid, fsid, BTRFS_FSID_SIZE)) {
list_for_each_entry(device, &fs_devices->devices,
dev_list) {
if (device->devid == devid &&
(!uuid || memcmp(device->uuid, uuid,
BTRFS_UUID_SIZE) == 0))
return device;
}
}
cur_devices = cur_devices->seed;
if (seed)
fs_devices = fs_devices->seed;
else
return NULL;
}
return NULL;
}
@ -6513,8 +6510,8 @@ static int read_one_chunk(struct btrfs_fs_info *fs_info, struct btrfs_key *key,
read_extent_buffer(leaf, uuid, (unsigned long)
btrfs_stripe_dev_uuid_nr(chunk, i),
BTRFS_UUID_SIZE);
map->stripes[i].dev = btrfs_find_device(fs_info, devid,
uuid, NULL);
map->stripes[i].dev = btrfs_find_device(fs_info->fs_devices,
devid, uuid, NULL, true);
if (!map->stripes[i].dev &&
!btrfs_test_opt(fs_info, DEGRADED)) {
free_extent_map(em);
@ -6653,7 +6650,8 @@ static int read_one_dev(struct btrfs_fs_info *fs_info,
return PTR_ERR(fs_devices);
}
device = btrfs_find_device(fs_info, devid, dev_uuid, fs_uuid);
device = btrfs_find_device(fs_info->fs_devices, devid, dev_uuid,
fs_uuid, true);
if (!device) {
if (!btrfs_test_opt(fs_info, DEGRADED)) {
btrfs_report_missing_device(fs_info, devid,
@ -7243,7 +7241,8 @@ int btrfs_get_dev_stats(struct btrfs_fs_info *fs_info,
int i;
mutex_lock(&fs_devices->device_list_mutex);
dev = btrfs_find_device(fs_info, stats->devid, NULL, NULL);
dev = btrfs_find_device(fs_info->fs_devices, stats->devid,
NULL, NULL, true);
mutex_unlock(&fs_devices->device_list_mutex);
if (!dev) {
@ -7460,7 +7459,7 @@ static int verify_one_dev_extent(struct btrfs_fs_info *fs_info,
}
/* Make sure no dev extent is beyond device bondary */
dev = btrfs_find_device(fs_info, devid, NULL, NULL);
dev = btrfs_find_device(fs_info->fs_devices, devid, NULL, NULL, true);
if (!dev) {
btrfs_err(fs_info, "failed to find devid %llu", devid);
ret = -EUCLEAN;
@ -7469,7 +7468,8 @@ static int verify_one_dev_extent(struct btrfs_fs_info *fs_info,
/* It's possible this device is a dummy for seed device */
if (dev->disk_total_bytes == 0) {
dev = find_device(fs_info->fs_devices->seed, devid, NULL);
dev = btrfs_find_device(fs_info->fs_devices->seed, devid,
NULL, NULL, false);
if (!dev) {
btrfs_err(fs_info, "failed to find seed devid %llu",
devid);

4
fs/btrfs/volumes.h
View file

@ -430,8 +430,8 @@ void __exit btrfs_cleanup_fs_uuids(void);
int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len);
int btrfs_grow_device(struct btrfs_trans_handle *trans,
struct btrfs_device *device, u64 new_size);
struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid,
u8 *uuid, u8 *fsid);
struct btrfs_device *btrfs_find_device(struct btrfs_fs_devices *fs_devices,
u64 devid, u8 *uuid, u8 *fsid, bool seed);
int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *path);
int btrfs_balance(struct btrfs_fs_info *fs_info,