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UBI: hide EBA internals 

Create a private ubi_eba_table struct to hide EBA internals and provide
helpers to allocate, destroy, copy and assing an EBA table to a volume.

Now that external EBA users are using helpers to query/modify the EBA
state we can safely change the internal representation, which will be
needed to support the LEB consolidation concept.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Boris Brezillon 2016-09-16 16:59:25 +02:00 committed by Richard Weinberger
parent 1f81a5ccab
commit 799dca34ac
4 changed files with 165 additions and 51 deletions
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2
drivers/mtd/ubi/build.c
View File

@ -574,7 +574,7 @@ void ubi_free_internal_volumes(struct ubi_device *ubi)
for (i = ubi->vtbl_slots;
i < ubi->vtbl_slots + UBI_INT_VOL_COUNT; i++) {
kfree(ubi->volumes[i]->eba_tbl);
ubi_eba_replace_table(ubi->volumes[i], NULL);
kfree(ubi->volumes[i]);
}
}

166
drivers/mtd/ubi/eba.c
View File

@ -49,6 +49,30 @@
/* Number of physical eraseblocks reserved for atomic LEB change operation */
#define EBA_RESERVED_PEBS 1
/**
* struct ubi_eba_entry - structure encoding a single LEB -> PEB association
* @pnum: the physical eraseblock number attached to the LEB
*
* This structure is encoding a LEB -> PEB association. Note that the LEB
* number is not stored here, because it is the index used to access the
* entries table.
*/
struct ubi_eba_entry {
int pnum;
};
/**
* struct ubi_eba_table - LEB -> PEB association information
* @entries: the LEB to PEB mapping (one entry per LEB).
*
* This structure is private to the EBA logic and should be kept here.
* It is encoding the LEB to PEB association table, and is subject to
* changes.
*/
struct ubi_eba_table {
struct ubi_eba_entry *entries;
};
/**
* next_sqnum - get next sequence number.
* @ubi: UBI device description object
@ -97,7 +121,94 @@ void ubi_eba_get_ldesc(struct ubi_volume *vol, int lnum,
struct ubi_eba_leb_desc *ldesc)
{
ldesc->lnum = lnum;
ldesc->pnum = vol->eba_tbl[lnum];
ldesc->pnum = vol->eba_tbl->entries[lnum].pnum;
}
/**
* ubi_eba_create_table - allocate a new EBA table and initialize it with all
* LEBs unmapped
* @vol: volume containing the EBA table to copy
* @nentries: number of entries in the table
*
* Allocate a new EBA table and initialize it with all LEBs unmapped.
* Returns a valid pointer if it succeed, an ERR_PTR() otherwise.
*/
struct ubi_eba_table *ubi_eba_create_table(struct ubi_volume *vol,
int nentries)
{
struct ubi_eba_table *tbl;
int err = -ENOMEM;
int i;
tbl = kzalloc(sizeof(*tbl), GFP_KERNEL);
if (!tbl)
return ERR_PTR(-ENOMEM);
tbl->entries = kmalloc_array(nentries, sizeof(*tbl->entries),
GFP_KERNEL);
if (!tbl->entries)
goto err;
for (i = 0; i < nentries; i++)
tbl->entries[i].pnum = UBI_LEB_UNMAPPED;
return tbl;
err:
kfree(tbl->entries);
kfree(tbl);
return ERR_PTR(err);
}
/**
* ubi_eba_destroy_table - destroy an EBA table
* @tbl: the table to destroy
*
* Destroy an EBA table.
*/
void ubi_eba_destroy_table(struct ubi_eba_table *tbl)
{
if (!tbl)
return;
kfree(tbl->entries);
kfree(tbl);
}
/**
* ubi_eba_copy_table - copy the EBA table attached to vol into another table
* @vol: volume containing the EBA table to copy
* @dst: destination
* @nentries: number of entries to copy
*
* Copy the EBA table stored in vol into the one pointed by dst.
*/
void ubi_eba_copy_table(struct ubi_volume *vol, struct ubi_eba_table *dst,
int nentries)
{
struct ubi_eba_table *src;
int i;
ubi_assert(dst && vol && vol->eba_tbl);
src = vol->eba_tbl;
for (i = 0; i < nentries; i++)
dst->entries[i].pnum = src->entries[i].pnum;
}
/**
* ubi_eba_replace_table - assign a new EBA table to a volume
* @vol: volume containing the EBA table to copy
* @tbl: new EBA table
*
* Assign a new EBA table to the volume and release the old one.
*/
void ubi_eba_replace_table(struct ubi_volume *vol, struct ubi_eba_table *tbl)
{
ubi_eba_destroy_table(vol->eba_tbl);
vol->eba_tbl = tbl;
}
/**
@ -337,7 +448,7 @@ static void leb_write_unlock(struct ubi_device *ubi, int vol_id, int lnum)
*/
bool ubi_eba_is_mapped(struct ubi_volume *vol, int lnum)
{
return vol->eba_tbl[lnum] >= 0;
return vol->eba_tbl->entries[lnum].pnum >= 0;
}
/**
@ -362,7 +473,7 @@ int ubi_eba_unmap_leb(struct ubi_device *ubi, struct ubi_volume *vol,
if (err)
return err;
pnum = vol->eba_tbl[lnum];
pnum = vol->eba_tbl->entries[lnum].pnum;
if (pnum < 0)
/* This logical eraseblock is already unmapped */
goto out_unlock;
@ -370,7 +481,7 @@ int ubi_eba_unmap_leb(struct ubi_device *ubi, struct ubi_volume *vol,
dbg_eba("erase LEB %d:%d, PEB %d", vol_id, lnum, pnum);
down_read(&ubi->fm_eba_sem);
vol->eba_tbl[lnum] = UBI_LEB_UNMAPPED;
vol->eba_tbl->entries[lnum].pnum = UBI_LEB_UNMAPPED;
up_read(&ubi->fm_eba_sem);
err = ubi_wl_put_peb(ubi, vol_id, lnum, pnum, 0);
@ -409,7 +520,7 @@ int ubi_eba_read_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum,
if (err)
return err;
pnum = vol->eba_tbl[lnum];
pnum = vol->eba_tbl->entries[lnum].pnum;
if (pnum < 0) {
/*
* The logical eraseblock is not mapped, fill the whole buffer
@ -658,7 +769,7 @@ out_unlock:
mutex_unlock(&ubi->buf_mutex);
if (!err)
vol->eba_tbl[lnum] = new_pnum;
vol->eba_tbl->entries[lnum].pnum = new_pnum;
out_put:
up_read(&ubi->fm_eba_sem);
@ -749,7 +860,7 @@ static int try_write_vid_and_data(struct ubi_volume *vol, int lnum,
goto out_put;
}
opnum = vol->eba_tbl[lnum];
opnum = vol->eba_tbl->entries[lnum].pnum;
dbg_eba("write VID hdr and %d bytes at offset %d of LEB %d:%d, PEB %d",
len, offset, vol_id, lnum, pnum);
@ -771,7 +882,7 @@ static int try_write_vid_and_data(struct ubi_volume *vol, int lnum,
}
}
vol->eba_tbl[lnum] = pnum;
vol->eba_tbl->entries[lnum].pnum = pnum;
out_put:
up_read(&ubi->fm_eba_sem);
@ -812,7 +923,7 @@ int ubi_eba_write_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum,
if (err)
return err;
pnum = vol->eba_tbl[lnum];
pnum = vol->eba_tbl->entries[lnum].pnum;
if (pnum >= 0) {
dbg_eba("write %d bytes at offset %d of LEB %d:%d, PEB %d",
len, offset, vol_id, lnum, pnum);
@ -930,7 +1041,7 @@ int ubi_eba_write_leb_st(struct ubi_device *ubi, struct ubi_volume *vol,
vid_hdr->used_ebs = cpu_to_be32(used_ebs);
vid_hdr->data_crc = cpu_to_be32(crc);
ubi_assert(vol->eba_tbl[lnum] < 0);
ubi_assert(vol->eba_tbl->entries[lnum].pnum < 0);
for (tries = 0; tries <= UBI_IO_RETRIES; tries++) {
err = try_write_vid_and_data(vol, lnum, vid_hdr, buf, 0, len);
@ -1140,9 +1251,9 @@ int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to,
* probably waiting on @ubi->move_mutex. No need to continue the work,
* cancel it.
*/
if (vol->eba_tbl[lnum] != from) {
if (vol->eba_tbl->entries[lnum].pnum != from) {
dbg_wl("LEB %d:%d is no longer mapped to PEB %d, mapped to PEB %d, cancel",
vol_id, lnum, from, vol->eba_tbl[lnum]);
vol_id, lnum, from, vol->eba_tbl->entries[lnum].pnum);
err = MOVE_CANCEL_RACE;
goto out_unlock_leb;
}
@ -1227,9 +1338,9 @@ int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to,
cond_resched();
}
ubi_assert(vol->eba_tbl[lnum] == from);
ubi_assert(vol->eba_tbl->entries[lnum].pnum == from);
down_read(&ubi->fm_eba_sem);
vol->eba_tbl[lnum] = to;
vol->eba_tbl->entries[lnum].pnum = to;
up_read(&ubi->fm_eba_sem);
out_unlock_buf:
@ -1386,7 +1497,7 @@ out_free:
*/
int ubi_eba_init(struct ubi_device *ubi, struct ubi_attach_info *ai)
{
int i, j, err, num_volumes;
int i, err, num_volumes;
struct ubi_ainf_volume *av;
struct ubi_volume *vol;
struct ubi_ainf_peb *aeb;
@ -1402,35 +1513,39 @@ int ubi_eba_init(struct ubi_device *ubi, struct ubi_attach_info *ai)
num_volumes = ubi->vtbl_slots + UBI_INT_VOL_COUNT;
for (i = 0; i < num_volumes; i++) {
struct ubi_eba_table *tbl;
vol = ubi->volumes[i];
if (!vol)
continue;
cond_resched();
vol->eba_tbl = kmalloc(vol->reserved_pebs * sizeof(int),
GFP_KERNEL);
if (!vol->eba_tbl) {
err = -ENOMEM;
tbl = ubi_eba_create_table(vol, vol->reserved_pebs);
if (IS_ERR(tbl)) {
err = PTR_ERR(tbl);
goto out_free;
}
for (j = 0; j < vol->reserved_pebs; j++)
vol->eba_tbl[j] = UBI_LEB_UNMAPPED;
ubi_eba_replace_table(vol, tbl);
av = ubi_find_av(ai, idx2vol_id(ubi, i));
if (!av)
continue;
ubi_rb_for_each_entry(rb, aeb, &av->root, u.rb) {
if (aeb->lnum >= vol->reserved_pebs)
if (aeb->lnum >= vol->reserved_pebs) {
/*
* This may happen in case of an unclean reboot
* during re-size.
*/
ubi_move_aeb_to_list(av, aeb, &ai->erase);
else
vol->eba_tbl[aeb->lnum] = aeb->pnum;
} else {
struct ubi_eba_entry *entry;
entry = &vol->eba_tbl->entries[aeb->lnum];
entry->pnum = aeb->pnum;
}
}
}
@ -1467,8 +1582,7 @@ out_free:
for (i = 0; i < num_volumes; i++) {
if (!ubi->volumes[i])
continue;
kfree(ubi->volumes[i]->eba_tbl);
ubi->volumes[i]->eba_tbl = NULL;
ubi_eba_replace_table(ubi->volumes[i], NULL);
}
return err;
}

8
drivers/mtd/ubi/ubi.h
View File

@ -359,7 +359,7 @@ struct ubi_volume {
long long upd_received;
void *upd_buf;
int *eba_tbl;
struct ubi_eba_table *eba_tbl;
unsigned int checked:1;
unsigned int corrupted:1;
unsigned int upd_marker:1;
@ -864,6 +864,12 @@ static inline bool ubi_leb_valid(struct ubi_volume *vol, int lnum)
}
/* eba.c */
struct ubi_eba_table *ubi_eba_create_table(struct ubi_volume *vol,
int nentries);
void ubi_eba_destroy_table(struct ubi_eba_table *tbl);
void ubi_eba_copy_table(struct ubi_volume *vol, struct ubi_eba_table *dst,
int nentries);
void ubi_eba_replace_table(struct ubi_volume *vol, struct ubi_eba_table *tbl);
void ubi_eba_get_ldesc(struct ubi_volume *vol, int lnum,
struct ubi_eba_leb_desc *ldesc);
bool ubi_eba_is_mapped(struct ubi_volume *vol, int lnum);

40
drivers/mtd/ubi/vmt.c
View File

@ -138,7 +138,7 @@ static void vol_release(struct device *dev)
{
struct ubi_volume *vol = container_of(dev, struct ubi_volume, dev);
kfree(vol->eba_tbl);
ubi_eba_replace_table(vol, NULL);
kfree(vol);
}
@ -158,6 +158,7 @@ int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req)
int i, err, vol_id = req->vol_id, do_free = 1;
struct ubi_volume *vol;
struct ubi_vtbl_record vtbl_rec;
struct ubi_eba_table *eba_tbl = NULL;
dev_t dev;
if (ubi->ro_mode)
@ -241,14 +242,13 @@ int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req)
if (err)
goto out_acc;
vol->eba_tbl = kmalloc(vol->reserved_pebs * sizeof(int), GFP_KERNEL);
if (!vol->eba_tbl) {
err = -ENOMEM;
eba_tbl = ubi_eba_create_table(vol, vol->reserved_pebs);
if (IS_ERR(eba_tbl)) {
err = PTR_ERR(eba_tbl);
goto out_acc;
}
for (i = 0; i < vol->reserved_pebs; i++)
vol->eba_tbl[i] = UBI_LEB_UNMAPPED;
ubi_eba_replace_table(vol, eba_tbl);
if (vol->vol_type == UBI_DYNAMIC_VOLUME) {
vol->used_ebs = vol->reserved_pebs;
@ -329,7 +329,7 @@ out_cdev:
cdev_del(&vol->cdev);
out_mapping:
if (do_free)
kfree(vol->eba_tbl);
ubi_eba_destroy_table(eba_tbl);
out_acc:
spin_lock(&ubi->volumes_lock);
ubi->rsvd_pebs -= vol->reserved_pebs;
@ -427,10 +427,11 @@ out_unlock:
*/
int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs)
{
int i, err, pebs, *new_mapping;
int i, err, pebs;
struct ubi_volume *vol = desc->vol;
struct ubi_device *ubi = vol->ubi;
struct ubi_vtbl_record vtbl_rec;
struct ubi_eba_table *new_eba_tbl = NULL;
int vol_id = vol->vol_id;
if (ubi->ro_mode)
@ -450,12 +451,9 @@ int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs)
if (reserved_pebs == vol->reserved_pebs)
return 0;
new_mapping = kmalloc(reserved_pebs * sizeof(int), GFP_KERNEL);
if (!new_mapping)
return -ENOMEM;
for (i = 0; i < reserved_pebs; i++)
new_mapping[i] = UBI_LEB_UNMAPPED;
new_eba_tbl = ubi_eba_create_table(vol, reserved_pebs);
if (IS_ERR(new_eba_tbl))
return PTR_ERR(new_eba_tbl);
spin_lock(&ubi->volumes_lock);
if (vol->ref_count > 1) {
@ -481,10 +479,8 @@ int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs)
}
ubi->avail_pebs -= pebs;
ubi->rsvd_pebs += pebs;
for (i = 0; i < vol->reserved_pebs; i++)
new_mapping[i] = vol->eba_tbl[i];
kfree(vol->eba_tbl);
vol->eba_tbl = new_mapping;
ubi_eba_copy_table(vol, new_eba_tbl, vol->reserved_pebs);
ubi_eba_replace_table(vol, new_eba_tbl);
spin_unlock(&ubi->volumes_lock);
}
@ -498,10 +494,8 @@ int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs)
ubi->rsvd_pebs += pebs;
ubi->avail_pebs -= pebs;
ubi_update_reserved(ubi);
for (i = 0; i < reserved_pebs; i++)
new_mapping[i] = vol->eba_tbl[i];
kfree(vol->eba_tbl);
vol->eba_tbl = new_mapping;
ubi_eba_copy_table(vol, new_eba_tbl, reserved_pebs);
ubi_eba_replace_table(vol, new_eba_tbl);
spin_unlock(&ubi->volumes_lock);
}
@ -543,7 +537,7 @@ out_acc:
spin_unlock(&ubi->volumes_lock);
}
out_free:
kfree(new_mapping);
kfree(new_eba_tbl);
return err;
}