UBI: tweak volumes locking

Transform vtbl_mutex to volumes_mutex - this just makes code
easier to understand.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
This commit is contained in:
Artem Bityutskiy 2007-12-17 12:46:48 +02:00
parent 89b96b6929
commit cae0a77125
6 changed files with 34 additions and 23 deletions

View File

@ -264,7 +264,7 @@ static int uif_init(struct ubi_device *ubi)
int i, err;
dev_t dev;
mutex_init(&ubi->vtbl_mutex);
mutex_init(&ubi->volumes_mutex);
spin_lock_init(&ubi->volumes_lock);
sprintf(ubi->ubi_name, UBI_NAME_STR "%d", ubi->ubi_num);

View File

@ -162,15 +162,16 @@ struct ubi_volume_desc *ubi_open_volume(int ubi_num, int vol_id, int mode)
desc->mode = mode;
/*
* To prevent simultaneous checks of the same volume we use @vtbl_mutex,
* although it is not the purpose it was introduced for.
* To prevent simultaneous checks of the same volume we use
* @volumes_mutex, although it is not the purpose it was introduced
* for.
*/
mutex_lock(&ubi->vtbl_mutex);
mutex_lock(&ubi->volumes_mutex);
if (!vol->checked) {
/* This is the first open - check the volume */
err = ubi_check_volume(ubi, vol_id);
if (err < 0) {
mutex_unlock(&ubi->vtbl_mutex);
mutex_unlock(&ubi->volumes_mutex);
ubi_close_volume(desc);
return ERR_PTR(err);
}
@ -181,7 +182,7 @@ struct ubi_volume_desc *ubi_open_volume(int ubi_num, int vol_id, int mode)
}
vol->checked = 1;
}
mutex_unlock(&ubi->vtbl_mutex);
mutex_unlock(&ubi->volumes_mutex);
return desc;
out_unlock:

View File

@ -255,7 +255,8 @@ struct ubi_wl_entry;
* @vtbl_slots: how many slots are available in the volume table
* @vtbl_size: size of the volume table in bytes
* @vtbl: in-RAM volume table copy
* @vtbl_mutex: protects on-flash volume table
* @volumes_mutex: protects on-flash volume table and serializes volume
* changes, like creation, deletion, update, resize
*
* @max_ec: current highest erase counter value
* @mean_ec: current mean erase counter value
@ -333,7 +334,7 @@ struct ubi_device {
int vtbl_slots;
int vtbl_size;
struct ubi_vtbl_record *vtbl;
struct mutex vtbl_mutex;
struct mutex volumes_mutex;
int max_ec;
int mean_ec;

View File

@ -67,7 +67,9 @@ static int set_update_marker(struct ubi_device *ubi, int vol_id)
memcpy(&vtbl_rec, &ubi->vtbl[vol_id], sizeof(struct ubi_vtbl_record));
vtbl_rec.upd_marker = 1;
mutex_lock(&ubi->volumes_mutex);
err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec);
mutex_unlock(&ubi->volumes_mutex);
vol->upd_marker = 1;
return err;
}
@ -106,7 +108,9 @@ static int clear_update_marker(struct ubi_device *ubi, int vol_id, long long byt
vol->last_eb_bytes = vol->usable_leb_size;
}
mutex_lock(&ubi->volumes_mutex);
err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec);
mutex_unlock(&ubi->volumes_mutex);
vol->upd_marker = 0;
return err;
}

View File

@ -201,8 +201,8 @@ int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req)
if (!vol)
return -ENOMEM;
mutex_lock(&ubi->volumes_mutex);
spin_lock(&ubi->volumes_lock);
if (vol_id == UBI_VOL_NUM_AUTO) {
/* Find unused volume ID */
dbg_msg("search for vacant volume ID");
@ -350,6 +350,7 @@ int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req)
spin_unlock(&ubi->volumes_lock);
paranoid_check_volumes(ubi);
mutex_unlock(&ubi->volumes_mutex);
return 0;
out_gluebi:
@ -365,6 +366,7 @@ out_acc:
ubi->volumes[vol_id] = NULL;
out_unlock:
spin_unlock(&ubi->volumes_lock);
mutex_unlock(&ubi->volumes_mutex);
kfree(vol);
ubi_err("cannot create volume %d, error %d", vol_id, err);
return err;
@ -382,6 +384,7 @@ out_sysfs:
ubi->avail_pebs += vol->reserved_pebs;
ubi->volumes[vol_id] = NULL;
spin_unlock(&ubi->volumes_lock);
mutex_unlock(&ubi->volumes_mutex);
volume_sysfs_close(vol);
ubi_err("cannot create volume %d, error %d", vol_id, err);
return err;
@ -408,18 +411,19 @@ int ubi_remove_volume(struct ubi_volume_desc *desc)
if (ubi->ro_mode)
return -EROFS;
mutex_lock(&ubi->volumes_mutex);
err = ubi_destroy_gluebi(vol);
if (err)
return err;
goto out;
err = ubi_change_vtbl_record(ubi, vol_id, NULL);
if (err)
return err;
goto out;
for (i = 0; i < vol->reserved_pebs; i++) {
err = ubi_eba_unmap_leb(ubi, vol, i);
if (err)
return err;
goto out;
}
spin_lock(&ubi->volumes_lock);
@ -449,8 +453,13 @@ int ubi_remove_volume(struct ubi_volume_desc *desc)
spin_unlock(&ubi->volumes_lock);
paranoid_check_volumes(ubi);
mutex_unlock(&ubi->volumes_mutex);
module_put(THIS_MODULE);
return 0;
out:
mutex_unlock(&ubi->volumes_mutex);
return err;
}
/**
@ -496,6 +505,7 @@ int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs)
new_mapping[i] = UBI_LEB_UNMAPPED;
/* Reserve physical eraseblocks */
mutex_lock(&ubi->volumes_mutex);
pebs = reserved_pebs - vol->reserved_pebs;
if (pebs > 0) {
spin_lock(&ubi->volumes_lock);
@ -556,6 +566,7 @@ int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs)
}
paranoid_check_volumes(ubi);
mutex_unlock(&ubi->volumes_mutex);
return 0;
out_acc:
@ -567,6 +578,7 @@ out_acc:
}
out_free:
kfree(new_mapping);
mutex_unlock(&ubi->volumes_mutex);
return err;
}
@ -829,9 +841,7 @@ static void paranoid_check_volumes(struct ubi_device *ubi)
{
int i;
mutex_lock(&ubi->vtbl_mutex);
for (i = 0; i < ubi->vtbl_slots; i++)
paranoid_check_volume(ubi, i);
mutex_unlock(&ubi->vtbl_mutex);
}
#endif

View File

@ -89,7 +89,7 @@ int ubi_change_vtbl_record(struct ubi_device *ubi, int idx,
struct ubi_volume *layout_vol;
ubi_assert(idx >= 0 && idx < ubi->vtbl_slots);
layout_vol = ubi->volumes[vol_id2idx(UBI_LAYOUT_VOL_ID)];
layout_vol = ubi->volumes[vol_id2idx(ubi, UBI_LAYOUT_VOL_ID)];
if (!vtbl_rec)
vtbl_rec = &empty_vtbl_record;
@ -98,24 +98,19 @@ int ubi_change_vtbl_record(struct ubi_device *ubi, int idx,
vtbl_rec->crc = cpu_to_be32(crc);
}
mutex_lock(&ubi->vtbl_mutex);
memcpy(&ubi->vtbl[idx], vtbl_rec, sizeof(struct ubi_vtbl_record));
for (i = 0; i < UBI_LAYOUT_VOLUME_EBS; i++) {
err = ubi_eba_unmap_leb(ubi, layout_vol, i);
if (err) {
mutex_unlock(&ubi->vtbl_mutex);
if (err)
return err;
}
err = ubi_eba_write_leb(ubi, layout_vol, i, ubi->vtbl, 0,
ubi->vtbl_size, UBI_LONGTERM);
if (err) {
mutex_unlock(&ubi->vtbl_mutex);
if (err)
return err;
}
}
paranoid_vtbl_check(ubi);
mutex_unlock(&ubi->vtbl_mutex);
return ubi_wl_flush(ubi);
}