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- /*
- * Copyright (c) International Business Machines Corp., 2006
- *
- * SPDX-License-Identifier: GPL-2.0+
- *
- * Author: Artem Bityutskiy (Битюцкий Артём)
- */
- /*
- * The UBI Eraseblock Association (EBA) sub-system.
- *
- * This sub-system is responsible for I/O to/from logical eraseblock.
- *
- * Although in this implementation the EBA table is fully kept and managed in
- * RAM, which assumes poor scalability, it might be (partially) maintained on
- * flash in future implementations.
- *
- * The EBA sub-system implements per-logical eraseblock locking. Before
- * accessing a logical eraseblock it is locked for reading or writing. The
- * per-logical eraseblock locking is implemented by means of the lock tree. The
- * lock tree is an RB-tree which refers all the currently locked logical
- * eraseblocks. The lock tree elements are &struct ubi_ltree_entry objects.
- * They are indexed by (@vol_id, @lnum) pairs.
- *
- * EBA also maintains the global sequence counter which is incremented each
- * time a logical eraseblock is mapped to a physical eraseblock and it is
- * stored in the volume identifier header. This means that each VID header has
- * a unique sequence number. The sequence number is only increased an we assume
- * 64 bits is enough to never overflow.
- */
- #ifndef __UBOOT__
- #include <linux/slab.h>
- #include <linux/crc32.h>
- #else
- #include <ubi_uboot.h>
- #endif
- #include <linux/err.h>
- #include "ubi.h"
- /* Number of physical eraseblocks reserved for atomic LEB change operation */
- #define EBA_RESERVED_PEBS 1
- /**
- * next_sqnum - get next sequence number.
- * @ubi: UBI device description object
- *
- * This function returns next sequence number to use, which is just the current
- * global sequence counter value. It also increases the global sequence
- * counter.
- */
- unsigned long long ubi_next_sqnum(struct ubi_device *ubi)
- {
- unsigned long long sqnum;
- spin_lock(&ubi->ltree_lock);
- sqnum = ubi->global_sqnum++;
- spin_unlock(&ubi->ltree_lock);
- return sqnum;
- }
- /**
- * ubi_get_compat - get compatibility flags of a volume.
- * @ubi: UBI device description object
- * @vol_id: volume ID
- *
- * This function returns compatibility flags for an internal volume. User
- * volumes have no compatibility flags, so %0 is returned.
- */
- static int ubi_get_compat(const struct ubi_device *ubi, int vol_id)
- {
- if (vol_id == UBI_LAYOUT_VOLUME_ID)
- return UBI_LAYOUT_VOLUME_COMPAT;
- return 0;
- }
- /**
- * ltree_lookup - look up the lock tree.
- * @ubi: UBI device description object
- * @vol_id: volume ID
- * @lnum: logical eraseblock number
- *
- * This function returns a pointer to the corresponding &struct ubi_ltree_entry
- * object if the logical eraseblock is locked and %NULL if it is not.
- * @ubi->ltree_lock has to be locked.
- */
- static struct ubi_ltree_entry *ltree_lookup(struct ubi_device *ubi, int vol_id,
- int lnum)
- {
- struct rb_node *p;
- p = ubi->ltree.rb_node;
- while (p) {
- struct ubi_ltree_entry *le;
- le = rb_entry(p, struct ubi_ltree_entry, rb);
- if (vol_id < le->vol_id)
- p = p->rb_left;
- else if (vol_id > le->vol_id)
- p = p->rb_right;
- else {
- if (lnum < le->lnum)
- p = p->rb_left;
- else if (lnum > le->lnum)
- p = p->rb_right;
- else
- return le;
- }
- }
- return NULL;
- }
- /**
- * ltree_add_entry - add new entry to the lock tree.
- * @ubi: UBI device description object
- * @vol_id: volume ID
- * @lnum: logical eraseblock number
- *
- * This function adds new entry for logical eraseblock (@vol_id, @lnum) to the
- * lock tree. If such entry is already there, its usage counter is increased.
- * Returns pointer to the lock tree entry or %-ENOMEM if memory allocation
- * failed.
- */
- static struct ubi_ltree_entry *ltree_add_entry(struct ubi_device *ubi,
- int vol_id, int lnum)
- {
- struct ubi_ltree_entry *le, *le1, *le_free;
- le = kmalloc(sizeof(struct ubi_ltree_entry), GFP_NOFS);
- if (!le)
- return ERR_PTR(-ENOMEM);
- le->users = 0;
- init_rwsem(&le->mutex);
- le->vol_id = vol_id;
- le->lnum = lnum;
- spin_lock(&ubi->ltree_lock);
- le1 = ltree_lookup(ubi, vol_id, lnum);
- if (le1) {
- /*
- * This logical eraseblock is already locked. The newly
- * allocated lock entry is not needed.
- */
- le_free = le;
- le = le1;
- } else {
- struct rb_node **p, *parent = NULL;
- /*
- * No lock entry, add the newly allocated one to the
- * @ubi->ltree RB-tree.
- */
- le_free = NULL;
- p = &ubi->ltree.rb_node;
- while (*p) {
- parent = *p;
- le1 = rb_entry(parent, struct ubi_ltree_entry, rb);
- if (vol_id < le1->vol_id)
- p = &(*p)->rb_left;
- else if (vol_id > le1->vol_id)
- p = &(*p)->rb_right;
- else {
- ubi_assert(lnum != le1->lnum);
- if (lnum < le1->lnum)
- p = &(*p)->rb_left;
- else
- p = &(*p)->rb_right;
- }
- }
- rb_link_node(&le->rb, parent, p);
- rb_insert_color(&le->rb, &ubi->ltree);
- }
- le->users += 1;
- spin_unlock(&ubi->ltree_lock);
- kfree(le_free);
- return le;
- }
- /**
- * leb_read_lock - lock logical eraseblock for reading.
- * @ubi: UBI device description object
- * @vol_id: volume ID
- * @lnum: logical eraseblock number
- *
- * This function locks a logical eraseblock for reading. Returns zero in case
- * of success and a negative error code in case of failure.
- */
- static int leb_read_lock(struct ubi_device *ubi, int vol_id, int lnum)
- {
- struct ubi_ltree_entry *le;
- le = ltree_add_entry(ubi, vol_id, lnum);
- if (IS_ERR(le))
- return PTR_ERR(le);
- down_read(&le->mutex);
- return 0;
- }
- /**
- * leb_read_unlock - unlock logical eraseblock.
- * @ubi: UBI device description object
- * @vol_id: volume ID
- * @lnum: logical eraseblock number
- */
- static void leb_read_unlock(struct ubi_device *ubi, int vol_id, int lnum)
- {
- struct ubi_ltree_entry *le;
- spin_lock(&ubi->ltree_lock);
- le = ltree_lookup(ubi, vol_id, lnum);
- le->users -= 1;
- ubi_assert(le->users >= 0);
- up_read(&le->mutex);
- if (le->users == 0) {
- rb_erase(&le->rb, &ubi->ltree);
- kfree(le);
- }
- spin_unlock(&ubi->ltree_lock);
- }
- /**
- * leb_write_lock - lock logical eraseblock for writing.
- * @ubi: UBI device description object
- * @vol_id: volume ID
- * @lnum: logical eraseblock number
- *
- * This function locks a logical eraseblock for writing. Returns zero in case
- * of success and a negative error code in case of failure.
- */
- static int leb_write_lock(struct ubi_device *ubi, int vol_id, int lnum)
- {
- struct ubi_ltree_entry *le;
- le = ltree_add_entry(ubi, vol_id, lnum);
- if (IS_ERR(le))
- return PTR_ERR(le);
- down_write(&le->mutex);
- return 0;
- }
- /**
- * leb_write_lock - lock logical eraseblock for writing.
- * @ubi: UBI device description object
- * @vol_id: volume ID
- * @lnum: logical eraseblock number
- *
- * This function locks a logical eraseblock for writing if there is no
- * contention and does nothing if there is contention. Returns %0 in case of
- * success, %1 in case of contention, and and a negative error code in case of
- * failure.
- */
- static int leb_write_trylock(struct ubi_device *ubi, int vol_id, int lnum)
- {
- struct ubi_ltree_entry *le;
- le = ltree_add_entry(ubi, vol_id, lnum);
- if (IS_ERR(le))
- return PTR_ERR(le);
- if (down_write_trylock(&le->mutex))
- return 0;
- /* Contention, cancel */
- spin_lock(&ubi->ltree_lock);
- le->users -= 1;
- ubi_assert(le->users >= 0);
- if (le->users == 0) {
- rb_erase(&le->rb, &ubi->ltree);
- kfree(le);
- }
- spin_unlock(&ubi->ltree_lock);
- return 1;
- }
- /**
- * leb_write_unlock - unlock logical eraseblock.
- * @ubi: UBI device description object
- * @vol_id: volume ID
- * @lnum: logical eraseblock number
- */
- static void leb_write_unlock(struct ubi_device *ubi, int vol_id, int lnum)
- {
- struct ubi_ltree_entry *le;
- spin_lock(&ubi->ltree_lock);
- le = ltree_lookup(ubi, vol_id, lnum);
- le->users -= 1;
- ubi_assert(le->users >= 0);
- up_write(&le->mutex);
- if (le->users == 0) {
- rb_erase(&le->rb, &ubi->ltree);
- kfree(le);
- }
- spin_unlock(&ubi->ltree_lock);
- }
- /**
- * ubi_eba_unmap_leb - un-map logical eraseblock.
- * @ubi: UBI device description object
- * @vol: volume description object
- * @lnum: logical eraseblock number
- *
- * This function un-maps logical eraseblock @lnum and schedules corresponding
- * physical eraseblock for erasure. Returns zero in case of success and a
- * negative error code in case of failure.
- */
- int ubi_eba_unmap_leb(struct ubi_device *ubi, struct ubi_volume *vol,
- int lnum)
- {
- int err, pnum, vol_id = vol->vol_id;
- if (ubi->ro_mode)
- return -EROFS;
- err = leb_write_lock(ubi, vol_id, lnum);
- if (err)
- return err;
- pnum = vol->eba_tbl[lnum];
- if (pnum < 0)
- /* This logical eraseblock is already unmapped */
- goto out_unlock;
- dbg_eba("erase LEB %d:%d, PEB %d", vol_id, lnum, pnum);
- down_read(&ubi->fm_sem);
- vol->eba_tbl[lnum] = UBI_LEB_UNMAPPED;
- up_read(&ubi->fm_sem);
- err = ubi_wl_put_peb(ubi, vol_id, lnum, pnum, 0);
- out_unlock:
- leb_write_unlock(ubi, vol_id, lnum);
- return err;
- }
- /**
- * ubi_eba_read_leb - read data.
- * @ubi: UBI device description object
- * @vol: volume description object
- * @lnum: logical eraseblock number
- * @buf: buffer to store the read data
- * @offset: offset from where to read
- * @len: how many bytes to read
- * @check: data CRC check flag
- *
- * If the logical eraseblock @lnum is unmapped, @buf is filled with 0xFF
- * bytes. The @check flag only makes sense for static volumes and forces
- * eraseblock data CRC checking.
- *
- * In case of success this function returns zero. In case of a static volume,
- * if data CRC mismatches - %-EBADMSG is returned. %-EBADMSG may also be
- * returned for any volume type if an ECC error was detected by the MTD device
- * driver. Other negative error cored may be returned in case of other errors.
- */
- int ubi_eba_read_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum,
- void *buf, int offset, int len, int check)
- {
- int err, pnum, scrub = 0, vol_id = vol->vol_id;
- struct ubi_vid_hdr *vid_hdr;
- uint32_t uninitialized_var(crc);
- err = leb_read_lock(ubi, vol_id, lnum);
- if (err)
- return err;
- pnum = vol->eba_tbl[lnum];
- if (pnum < 0) {
- /*
- * The logical eraseblock is not mapped, fill the whole buffer
- * with 0xFF bytes. The exception is static volumes for which
- * it is an error to read unmapped logical eraseblocks.
- */
- dbg_eba("read %d bytes from offset %d of LEB %d:%d (unmapped)",
- len, offset, vol_id, lnum);
- leb_read_unlock(ubi, vol_id, lnum);
- ubi_assert(vol->vol_type != UBI_STATIC_VOLUME);
- memset(buf, 0xFF, len);
- return 0;
- }
- dbg_eba("read %d bytes from offset %d of LEB %d:%d, PEB %d",
- len, offset, vol_id, lnum, pnum);
- if (vol->vol_type == UBI_DYNAMIC_VOLUME)
- check = 0;
- retry:
- if (check) {
- vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS);
- if (!vid_hdr) {
- err = -ENOMEM;
- goto out_unlock;
- }
- err = ubi_io_read_vid_hdr(ubi, pnum, vid_hdr, 1);
- if (err && err != UBI_IO_BITFLIPS) {
- if (err > 0) {
- /*
- * The header is either absent or corrupted.
- * The former case means there is a bug -
- * switch to read-only mode just in case.
- * The latter case means a real corruption - we
- * may try to recover data. FIXME: but this is
- * not implemented.
- */
- if (err == UBI_IO_BAD_HDR_EBADMSG ||
- err == UBI_IO_BAD_HDR) {
- ubi_warn("corrupted VID header at PEB %d, LEB %d:%d",
- pnum, vol_id, lnum);
- err = -EBADMSG;
- } else
- ubi_ro_mode(ubi);
- }
- goto out_free;
- } else if (err == UBI_IO_BITFLIPS)
- scrub = 1;
- ubi_assert(lnum < be32_to_cpu(vid_hdr->used_ebs));
- ubi_assert(len == be32_to_cpu(vid_hdr->data_size));
- crc = be32_to_cpu(vid_hdr->data_crc);
- ubi_free_vid_hdr(ubi, vid_hdr);
- }
- err = ubi_io_read_data(ubi, buf, pnum, offset, len);
- if (err) {
- if (err == UBI_IO_BITFLIPS) {
- scrub = 1;
- err = 0;
- } else if (mtd_is_eccerr(err)) {
- if (vol->vol_type == UBI_DYNAMIC_VOLUME)
- goto out_unlock;
- scrub = 1;
- if (!check) {
- ubi_msg("force data checking");
- check = 1;
- goto retry;
- }
- } else
- goto out_unlock;
- }
- if (check) {
- uint32_t crc1 = crc32(UBI_CRC32_INIT, buf, len);
- if (crc1 != crc) {
- ubi_warn("CRC error: calculated %#08x, must be %#08x",
- crc1, crc);
- err = -EBADMSG;
- goto out_unlock;
- }
- }
- if (scrub)
- err = ubi_wl_scrub_peb(ubi, pnum);
- leb_read_unlock(ubi, vol_id, lnum);
- return err;
- out_free:
- ubi_free_vid_hdr(ubi, vid_hdr);
- out_unlock:
- leb_read_unlock(ubi, vol_id, lnum);
- return err;
- }
- /**
- * recover_peb - recover from write failure.
- * @ubi: UBI device description object
- * @pnum: the physical eraseblock to recover
- * @vol_id: volume ID
- * @lnum: logical eraseblock number
- * @buf: data which was not written because of the write failure
- * @offset: offset of the failed write
- * @len: how many bytes should have been written
- *
- * This function is called in case of a write failure and moves all good data
- * from the potentially bad physical eraseblock to a good physical eraseblock.
- * This function also writes the data which was not written due to the failure.
- * Returns new physical eraseblock number in case of success, and a negative
- * error code in case of failure.
- */
- static int recover_peb(struct ubi_device *ubi, int pnum, int vol_id, int lnum,
- const void *buf, int offset, int len)
- {
- int err, idx = vol_id2idx(ubi, vol_id), new_pnum, data_size, tries = 0;
- struct ubi_volume *vol = ubi->volumes[idx];
- struct ubi_vid_hdr *vid_hdr;
- vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS);
- if (!vid_hdr)
- return -ENOMEM;
- retry:
- new_pnum = ubi_wl_get_peb(ubi);
- if (new_pnum < 0) {
- ubi_free_vid_hdr(ubi, vid_hdr);
- return new_pnum;
- }
- ubi_msg("recover PEB %d, move data to PEB %d", pnum, new_pnum);
- err = ubi_io_read_vid_hdr(ubi, pnum, vid_hdr, 1);
- if (err && err != UBI_IO_BITFLIPS) {
- if (err > 0)
- err = -EIO;
- goto out_put;
- }
- vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
- err = ubi_io_write_vid_hdr(ubi, new_pnum, vid_hdr);
- if (err)
- goto write_error;
- data_size = offset + len;
- mutex_lock(&ubi->buf_mutex);
- memset(ubi->peb_buf + offset, 0xFF, len);
- /* Read everything before the area where the write failure happened */
- if (offset > 0) {
- err = ubi_io_read_data(ubi, ubi->peb_buf, pnum, 0, offset);
- if (err && err != UBI_IO_BITFLIPS)
- goto out_unlock;
- }
- memcpy(ubi->peb_buf + offset, buf, len);
- err = ubi_io_write_data(ubi, ubi->peb_buf, new_pnum, 0, data_size);
- if (err) {
- mutex_unlock(&ubi->buf_mutex);
- goto write_error;
- }
- mutex_unlock(&ubi->buf_mutex);
- ubi_free_vid_hdr(ubi, vid_hdr);
- down_read(&ubi->fm_sem);
- vol->eba_tbl[lnum] = new_pnum;
- up_read(&ubi->fm_sem);
- ubi_wl_put_peb(ubi, vol_id, lnum, pnum, 1);
- ubi_msg("data was successfully recovered");
- return 0;
- out_unlock:
- mutex_unlock(&ubi->buf_mutex);
- out_put:
- ubi_wl_put_peb(ubi, vol_id, lnum, new_pnum, 1);
- ubi_free_vid_hdr(ubi, vid_hdr);
- return err;
- write_error:
- /*
- * Bad luck? This physical eraseblock is bad too? Crud. Let's try to
- * get another one.
- */
- ubi_warn("failed to write to PEB %d", new_pnum);
- ubi_wl_put_peb(ubi, vol_id, lnum, new_pnum, 1);
- if (++tries > UBI_IO_RETRIES) {
- ubi_free_vid_hdr(ubi, vid_hdr);
- return err;
- }
- ubi_msg("try again");
- goto retry;
- }
- /**
- * ubi_eba_write_leb - write data to dynamic volume.
- * @ubi: UBI device description object
- * @vol: volume description object
- * @lnum: logical eraseblock number
- * @buf: the data to write
- * @offset: offset within the logical eraseblock where to write
- * @len: how many bytes to write
- *
- * This function writes data to logical eraseblock @lnum of a dynamic volume
- * @vol. Returns zero in case of success and a negative error code in case
- * of failure. In case of error, it is possible that something was still
- * written to the flash media, but may be some garbage.
- */
- int ubi_eba_write_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum,
- const void *buf, int offset, int len)
- {
- int err, pnum, tries = 0, vol_id = vol->vol_id;
- struct ubi_vid_hdr *vid_hdr;
- if (ubi->ro_mode)
- return -EROFS;
- err = leb_write_lock(ubi, vol_id, lnum);
- if (err)
- return err;
- pnum = vol->eba_tbl[lnum];
- if (pnum >= 0) {
- dbg_eba("write %d bytes at offset %d of LEB %d:%d, PEB %d",
- len, offset, vol_id, lnum, pnum);
- err = ubi_io_write_data(ubi, buf, pnum, offset, len);
- if (err) {
- ubi_warn("failed to write data to PEB %d", pnum);
- if (err == -EIO && ubi->bad_allowed)
- err = recover_peb(ubi, pnum, vol_id, lnum, buf,
- offset, len);
- if (err)
- ubi_ro_mode(ubi);
- }
- leb_write_unlock(ubi, vol_id, lnum);
- return err;
- }
- /*
- * The logical eraseblock is not mapped. We have to get a free physical
- * eraseblock and write the volume identifier header there first.
- */
- vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS);
- if (!vid_hdr) {
- leb_write_unlock(ubi, vol_id, lnum);
- return -ENOMEM;
- }
- vid_hdr->vol_type = UBI_VID_DYNAMIC;
- vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
- vid_hdr->vol_id = cpu_to_be32(vol_id);
- vid_hdr->lnum = cpu_to_be32(lnum);
- vid_hdr->compat = ubi_get_compat(ubi, vol_id);
- vid_hdr->data_pad = cpu_to_be32(vol->data_pad);
- retry:
- pnum = ubi_wl_get_peb(ubi);
- if (pnum < 0) {
- ubi_free_vid_hdr(ubi, vid_hdr);
- leb_write_unlock(ubi, vol_id, lnum);
- return pnum;
- }
- dbg_eba("write VID hdr and %d bytes at offset %d of LEB %d:%d, PEB %d",
- len, offset, vol_id, lnum, pnum);
- err = ubi_io_write_vid_hdr(ubi, pnum, vid_hdr);
- if (err) {
- ubi_warn("failed to write VID header to LEB %d:%d, PEB %d",
- vol_id, lnum, pnum);
- goto write_error;
- }
- if (len) {
- err = ubi_io_write_data(ubi, buf, pnum, offset, len);
- if (err) {
- ubi_warn("failed to write %d bytes at offset %d of LEB %d:%d, PEB %d",
- len, offset, vol_id, lnum, pnum);
- goto write_error;
- }
- }
- down_read(&ubi->fm_sem);
- vol->eba_tbl[lnum] = pnum;
- up_read(&ubi->fm_sem);
- leb_write_unlock(ubi, vol_id, lnum);
- ubi_free_vid_hdr(ubi, vid_hdr);
- return 0;
- write_error:
- if (err != -EIO || !ubi->bad_allowed) {
- ubi_ro_mode(ubi);
- leb_write_unlock(ubi, vol_id, lnum);
- ubi_free_vid_hdr(ubi, vid_hdr);
- return err;
- }
- /*
- * Fortunately, this is the first write operation to this physical
- * eraseblock, so just put it and request a new one. We assume that if
- * this physical eraseblock went bad, the erase code will handle that.
- */
- err = ubi_wl_put_peb(ubi, vol_id, lnum, pnum, 1);
- if (err || ++tries > UBI_IO_RETRIES) {
- ubi_ro_mode(ubi);
- leb_write_unlock(ubi, vol_id, lnum);
- ubi_free_vid_hdr(ubi, vid_hdr);
- return err;
- }
- vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
- ubi_msg("try another PEB");
- goto retry;
- }
- /**
- * ubi_eba_write_leb_st - write data to static volume.
- * @ubi: UBI device description object
- * @vol: volume description object
- * @lnum: logical eraseblock number
- * @buf: data to write
- * @len: how many bytes to write
- * @used_ebs: how many logical eraseblocks will this volume contain
- *
- * This function writes data to logical eraseblock @lnum of static volume
- * @vol. The @used_ebs argument should contain total number of logical
- * eraseblock in this static volume.
- *
- * When writing to the last logical eraseblock, the @len argument doesn't have
- * to be aligned to the minimal I/O unit size. Instead, it has to be equivalent
- * to the real data size, although the @buf buffer has to contain the
- * alignment. In all other cases, @len has to be aligned.
- *
- * It is prohibited to write more than once to logical eraseblocks of static
- * volumes. This function returns zero in case of success and a negative error
- * code in case of failure.
- */
- int ubi_eba_write_leb_st(struct ubi_device *ubi, struct ubi_volume *vol,
- int lnum, const void *buf, int len, int used_ebs)
- {
- int err, pnum, tries = 0, data_size = len, vol_id = vol->vol_id;
- struct ubi_vid_hdr *vid_hdr;
- uint32_t crc;
- if (ubi->ro_mode)
- return -EROFS;
- if (lnum == used_ebs - 1)
- /* If this is the last LEB @len may be unaligned */
- len = ALIGN(data_size, ubi->min_io_size);
- else
- ubi_assert(!(len & (ubi->min_io_size - 1)));
- vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS);
- if (!vid_hdr)
- return -ENOMEM;
- err = leb_write_lock(ubi, vol_id, lnum);
- if (err) {
- ubi_free_vid_hdr(ubi, vid_hdr);
- return err;
- }
- vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
- vid_hdr->vol_id = cpu_to_be32(vol_id);
- vid_hdr->lnum = cpu_to_be32(lnum);
- vid_hdr->compat = ubi_get_compat(ubi, vol_id);
- vid_hdr->data_pad = cpu_to_be32(vol->data_pad);
- crc = crc32(UBI_CRC32_INIT, buf, data_size);
- vid_hdr->vol_type = UBI_VID_STATIC;
- vid_hdr->data_size = cpu_to_be32(data_size);
- vid_hdr->used_ebs = cpu_to_be32(used_ebs);
- vid_hdr->data_crc = cpu_to_be32(crc);
- retry:
- pnum = ubi_wl_get_peb(ubi);
- if (pnum < 0) {
- ubi_free_vid_hdr(ubi, vid_hdr);
- leb_write_unlock(ubi, vol_id, lnum);
- return pnum;
- }
- dbg_eba("write VID hdr and %d bytes at LEB %d:%d, PEB %d, used_ebs %d",
- len, vol_id, lnum, pnum, used_ebs);
- err = ubi_io_write_vid_hdr(ubi, pnum, vid_hdr);
- if (err) {
- ubi_warn("failed to write VID header to LEB %d:%d, PEB %d",
- vol_id, lnum, pnum);
- goto write_error;
- }
- err = ubi_io_write_data(ubi, buf, pnum, 0, len);
- if (err) {
- ubi_warn("failed to write %d bytes of data to PEB %d",
- len, pnum);
- goto write_error;
- }
- ubi_assert(vol->eba_tbl[lnum] < 0);
- down_read(&ubi->fm_sem);
- vol->eba_tbl[lnum] = pnum;
- up_read(&ubi->fm_sem);
- leb_write_unlock(ubi, vol_id, lnum);
- ubi_free_vid_hdr(ubi, vid_hdr);
- return 0;
- write_error:
- if (err != -EIO || !ubi->bad_allowed) {
- /*
- * This flash device does not admit of bad eraseblocks or
- * something nasty and unexpected happened. Switch to read-only
- * mode just in case.
- */
- ubi_ro_mode(ubi);
- leb_write_unlock(ubi, vol_id, lnum);
- ubi_free_vid_hdr(ubi, vid_hdr);
- return err;
- }
- err = ubi_wl_put_peb(ubi, vol_id, lnum, pnum, 1);
- if (err || ++tries > UBI_IO_RETRIES) {
- ubi_ro_mode(ubi);
- leb_write_unlock(ubi, vol_id, lnum);
- ubi_free_vid_hdr(ubi, vid_hdr);
- return err;
- }
- vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
- ubi_msg("try another PEB");
- goto retry;
- }
- /*
- * ubi_eba_atomic_leb_change - change logical eraseblock atomically.
- * @ubi: UBI device description object
- * @vol: volume description object
- * @lnum: logical eraseblock number
- * @buf: data to write
- * @len: how many bytes to write
- *
- * This function changes the contents of a logical eraseblock atomically. @buf
- * has to contain new logical eraseblock data, and @len - the length of the
- * data, which has to be aligned. This function guarantees that in case of an
- * unclean reboot the old contents is preserved. Returns zero in case of
- * success and a negative error code in case of failure.
- *
- * UBI reserves one LEB for the "atomic LEB change" operation, so only one
- * LEB change may be done at a time. This is ensured by @ubi->alc_mutex.
- */
- int ubi_eba_atomic_leb_change(struct ubi_device *ubi, struct ubi_volume *vol,
- int lnum, const void *buf, int len)
- {
- int err, pnum, tries = 0, vol_id = vol->vol_id;
- struct ubi_vid_hdr *vid_hdr;
- uint32_t crc;
- if (ubi->ro_mode)
- return -EROFS;
- if (len == 0) {
- /*
- * Special case when data length is zero. In this case the LEB
- * has to be unmapped and mapped somewhere else.
- */
- err = ubi_eba_unmap_leb(ubi, vol, lnum);
- if (err)
- return err;
- return ubi_eba_write_leb(ubi, vol, lnum, NULL, 0, 0);
- }
- vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS);
- if (!vid_hdr)
- return -ENOMEM;
- mutex_lock(&ubi->alc_mutex);
- err = leb_write_lock(ubi, vol_id, lnum);
- if (err)
- goto out_mutex;
- vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
- vid_hdr->vol_id = cpu_to_be32(vol_id);
- vid_hdr->lnum = cpu_to_be32(lnum);
- vid_hdr->compat = ubi_get_compat(ubi, vol_id);
- vid_hdr->data_pad = cpu_to_be32(vol->data_pad);
- crc = crc32(UBI_CRC32_INIT, buf, len);
- vid_hdr->vol_type = UBI_VID_DYNAMIC;
- vid_hdr->data_size = cpu_to_be32(len);
- vid_hdr->copy_flag = 1;
- vid_hdr->data_crc = cpu_to_be32(crc);
- retry:
- pnum = ubi_wl_get_peb(ubi);
- if (pnum < 0) {
- err = pnum;
- goto out_leb_unlock;
- }
- dbg_eba("change LEB %d:%d, PEB %d, write VID hdr to PEB %d",
- vol_id, lnum, vol->eba_tbl[lnum], pnum);
- err = ubi_io_write_vid_hdr(ubi, pnum, vid_hdr);
- if (err) {
- ubi_warn("failed to write VID header to LEB %d:%d, PEB %d",
- vol_id, lnum, pnum);
- goto write_error;
- }
- err = ubi_io_write_data(ubi, buf, pnum, 0, len);
- if (err) {
- ubi_warn("failed to write %d bytes of data to PEB %d",
- len, pnum);
- goto write_error;
- }
- if (vol->eba_tbl[lnum] >= 0) {
- err = ubi_wl_put_peb(ubi, vol_id, lnum, vol->eba_tbl[lnum], 0);
- if (err)
- goto out_leb_unlock;
- }
- down_read(&ubi->fm_sem);
- vol->eba_tbl[lnum] = pnum;
- up_read(&ubi->fm_sem);
- out_leb_unlock:
- leb_write_unlock(ubi, vol_id, lnum);
- out_mutex:
- mutex_unlock(&ubi->alc_mutex);
- ubi_free_vid_hdr(ubi, vid_hdr);
- return err;
- write_error:
- if (err != -EIO || !ubi->bad_allowed) {
- /*
- * This flash device does not admit of bad eraseblocks or
- * something nasty and unexpected happened. Switch to read-only
- * mode just in case.
- */
- ubi_ro_mode(ubi);
- goto out_leb_unlock;
- }
- err = ubi_wl_put_peb(ubi, vol_id, lnum, pnum, 1);
- if (err || ++tries > UBI_IO_RETRIES) {
- ubi_ro_mode(ubi);
- goto out_leb_unlock;
- }
- vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
- ubi_msg("try another PEB");
- goto retry;
- }
- /**
- * is_error_sane - check whether a read error is sane.
- * @err: code of the error happened during reading
- *
- * This is a helper function for 'ubi_eba_copy_leb()' which is called when we
- * cannot read data from the target PEB (an error @err happened). If the error
- * code is sane, then we treat this error as non-fatal. Otherwise the error is
- * fatal and UBI will be switched to R/O mode later.
- *
- * The idea is that we try not to switch to R/O mode if the read error is
- * something which suggests there was a real read problem. E.g., %-EIO. Or a
- * memory allocation failed (-%ENOMEM). Otherwise, it is safer to switch to R/O
- * mode, simply because we do not know what happened at the MTD level, and we
- * cannot handle this. E.g., the underlying driver may have become crazy, and
- * it is safer to switch to R/O mode to preserve the data.
- *
- * And bear in mind, this is about reading from the target PEB, i.e. the PEB
- * which we have just written.
- */
- static int is_error_sane(int err)
- {
- if (err == -EIO || err == -ENOMEM || err == UBI_IO_BAD_HDR ||
- err == UBI_IO_BAD_HDR_EBADMSG || err == -ETIMEDOUT)
- return 0;
- return 1;
- }
- /**
- * ubi_eba_copy_leb - copy logical eraseblock.
- * @ubi: UBI device description object
- * @from: physical eraseblock number from where to copy
- * @to: physical eraseblock number where to copy
- * @vid_hdr: VID header of the @from physical eraseblock
- *
- * This function copies logical eraseblock from physical eraseblock @from to
- * physical eraseblock @to. The @vid_hdr buffer may be changed by this
- * function. Returns:
- * o %0 in case of success;
- * o %MOVE_CANCEL_RACE, %MOVE_TARGET_WR_ERR, %MOVE_TARGET_BITFLIPS, etc;
- * o a negative error code in case of failure.
- */
- int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to,
- struct ubi_vid_hdr *vid_hdr)
- {
- int err, vol_id, lnum, data_size, aldata_size, idx;
- struct ubi_volume *vol;
- uint32_t crc;
- vol_id = be32_to_cpu(vid_hdr->vol_id);
- lnum = be32_to_cpu(vid_hdr->lnum);
- dbg_wl("copy LEB %d:%d, PEB %d to PEB %d", vol_id, lnum, from, to);
- if (vid_hdr->vol_type == UBI_VID_STATIC) {
- data_size = be32_to_cpu(vid_hdr->data_size);
- aldata_size = ALIGN(data_size, ubi->min_io_size);
- } else
- data_size = aldata_size =
- ubi->leb_size - be32_to_cpu(vid_hdr->data_pad);
- idx = vol_id2idx(ubi, vol_id);
- spin_lock(&ubi->volumes_lock);
- /*
- * Note, we may race with volume deletion, which means that the volume
- * this logical eraseblock belongs to might be being deleted. Since the
- * volume deletion un-maps all the volume's logical eraseblocks, it will
- * be locked in 'ubi_wl_put_peb()' and wait for the WL worker to finish.
- */
- vol = ubi->volumes[idx];
- spin_unlock(&ubi->volumes_lock);
- if (!vol) {
- /* No need to do further work, cancel */
- dbg_wl("volume %d is being removed, cancel", vol_id);
- return MOVE_CANCEL_RACE;
- }
- /*
- * We do not want anybody to write to this logical eraseblock while we
- * are moving it, so lock it.
- *
- * Note, we are using non-waiting locking here, because we cannot sleep
- * on the LEB, since it may cause deadlocks. Indeed, imagine a task is
- * unmapping the LEB which is mapped to the PEB we are going to move
- * (@from). This task locks the LEB and goes sleep in the
- * 'ubi_wl_put_peb()' function on the @ubi->move_mutex. In turn, we are
- * holding @ubi->move_mutex and go sleep on the LEB lock. So, if the
- * LEB is already locked, we just do not move it and return
- * %MOVE_RETRY. Note, we do not return %MOVE_CANCEL_RACE here because
- * we do not know the reasons of the contention - it may be just a
- * normal I/O on this LEB, so we want to re-try.
- */
- err = leb_write_trylock(ubi, vol_id, lnum);
- if (err) {
- dbg_wl("contention on LEB %d:%d, cancel", vol_id, lnum);
- return MOVE_RETRY;
- }
- /*
- * The LEB might have been put meanwhile, and the task which put it is
- * probably waiting on @ubi->move_mutex. No need to continue the work,
- * cancel it.
- */
- if (vol->eba_tbl[lnum] != 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]);
- err = MOVE_CANCEL_RACE;
- goto out_unlock_leb;
- }
- /*
- * OK, now the LEB is locked and we can safely start moving it. Since
- * this function utilizes the @ubi->peb_buf buffer which is shared
- * with some other functions - we lock the buffer by taking the
- * @ubi->buf_mutex.
- */
- mutex_lock(&ubi->buf_mutex);
- dbg_wl("read %d bytes of data", aldata_size);
- err = ubi_io_read_data(ubi, ubi->peb_buf, from, 0, aldata_size);
- if (err && err != UBI_IO_BITFLIPS) {
- ubi_warn("error %d while reading data from PEB %d",
- err, from);
- err = MOVE_SOURCE_RD_ERR;
- goto out_unlock_buf;
- }
- /*
- * Now we have got to calculate how much data we have to copy. In
- * case of a static volume it is fairly easy - the VID header contains
- * the data size. In case of a dynamic volume it is more difficult - we
- * have to read the contents, cut 0xFF bytes from the end and copy only
- * the first part. We must do this to avoid writing 0xFF bytes as it
- * may have some side-effects. And not only this. It is important not
- * to include those 0xFFs to CRC because later the they may be filled
- * by data.
- */
- if (vid_hdr->vol_type == UBI_VID_DYNAMIC)
- aldata_size = data_size =
- ubi_calc_data_len(ubi, ubi->peb_buf, data_size);
- cond_resched();
- crc = crc32(UBI_CRC32_INIT, ubi->peb_buf, data_size);
- cond_resched();
- /*
- * It may turn out to be that the whole @from physical eraseblock
- * contains only 0xFF bytes. Then we have to only write the VID header
- * and do not write any data. This also means we should not set
- * @vid_hdr->copy_flag, @vid_hdr->data_size, and @vid_hdr->data_crc.
- */
- if (data_size > 0) {
- vid_hdr->copy_flag = 1;
- vid_hdr->data_size = cpu_to_be32(data_size);
- vid_hdr->data_crc = cpu_to_be32(crc);
- }
- vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
- err = ubi_io_write_vid_hdr(ubi, to, vid_hdr);
- if (err) {
- if (err == -EIO)
- err = MOVE_TARGET_WR_ERR;
- goto out_unlock_buf;
- }
- cond_resched();
- /* Read the VID header back and check if it was written correctly */
- err = ubi_io_read_vid_hdr(ubi, to, vid_hdr, 1);
- if (err) {
- if (err != UBI_IO_BITFLIPS) {
- ubi_warn("error %d while reading VID header back from PEB %d",
- err, to);
- if (is_error_sane(err))
- err = MOVE_TARGET_RD_ERR;
- } else
- err = MOVE_TARGET_BITFLIPS;
- goto out_unlock_buf;
- }
- if (data_size > 0) {
- err = ubi_io_write_data(ubi, ubi->peb_buf, to, 0, aldata_size);
- if (err) {
- if (err == -EIO)
- err = MOVE_TARGET_WR_ERR;
- goto out_unlock_buf;
- }
- cond_resched();
- /*
- * We've written the data and are going to read it back to make
- * sure it was written correctly.
- */
- memset(ubi->peb_buf, 0xFF, aldata_size);
- err = ubi_io_read_data(ubi, ubi->peb_buf, to, 0, aldata_size);
- if (err) {
- if (err != UBI_IO_BITFLIPS) {
- ubi_warn("error %d while reading data back from PEB %d",
- err, to);
- if (is_error_sane(err))
- err = MOVE_TARGET_RD_ERR;
- } else
- err = MOVE_TARGET_BITFLIPS;
- goto out_unlock_buf;
- }
- cond_resched();
- if (crc != crc32(UBI_CRC32_INIT, ubi->peb_buf, data_size)) {
- ubi_warn("read data back from PEB %d and it is different",
- to);
- err = -EINVAL;
- goto out_unlock_buf;
- }
- }
- ubi_assert(vol->eba_tbl[lnum] == from);
- down_read(&ubi->fm_sem);
- vol->eba_tbl[lnum] = to;
- up_read(&ubi->fm_sem);
- out_unlock_buf:
- mutex_unlock(&ubi->buf_mutex);
- out_unlock_leb:
- leb_write_unlock(ubi, vol_id, lnum);
- return err;
- }
- /**
- * print_rsvd_warning - warn about not having enough reserved PEBs.
- * @ubi: UBI device description object
- *
- * This is a helper function for 'ubi_eba_init()' which is called when UBI
- * cannot reserve enough PEBs for bad block handling. This function makes a
- * decision whether we have to print a warning or not. The algorithm is as
- * follows:
- * o if this is a new UBI image, then just print the warning
- * o if this is an UBI image which has already been used for some time, print
- * a warning only if we can reserve less than 10% of the expected amount of
- * the reserved PEB.
- *
- * The idea is that when UBI is used, PEBs become bad, and the reserved pool
- * of PEBs becomes smaller, which is normal and we do not want to scare users
- * with a warning every time they attach the MTD device. This was an issue
- * reported by real users.
- */
- static void print_rsvd_warning(struct ubi_device *ubi,
- struct ubi_attach_info *ai)
- {
- /*
- * The 1 << 18 (256KiB) number is picked randomly, just a reasonably
- * large number to distinguish between newly flashed and used images.
- */
- if (ai->max_sqnum > (1 << 18)) {
- int min = ubi->beb_rsvd_level / 10;
- if (!min)
- min = 1;
- if (ubi->beb_rsvd_pebs > min)
- return;
- }
- ubi_warn("cannot reserve enough PEBs for bad PEB handling, reserved %d, need %d",
- ubi->beb_rsvd_pebs, ubi->beb_rsvd_level);
- if (ubi->corr_peb_count)
- ubi_warn("%d PEBs are corrupted and not used",
- ubi->corr_peb_count);
- }
- /**
- * self_check_eba - run a self check on the EBA table constructed by fastmap.
- * @ubi: UBI device description object
- * @ai_fastmap: UBI attach info object created by fastmap
- * @ai_scan: UBI attach info object created by scanning
- *
- * Returns < 0 in case of an internal error, 0 otherwise.
- * If a bad EBA table entry was found it will be printed out and
- * ubi_assert() triggers.
- */
- int self_check_eba(struct ubi_device *ubi, struct ubi_attach_info *ai_fastmap,
- struct ubi_attach_info *ai_scan)
- {
- int i, j, num_volumes, ret = 0;
- int **scan_eba, **fm_eba;
- struct ubi_ainf_volume *av;
- struct ubi_volume *vol;
- struct ubi_ainf_peb *aeb;
- struct rb_node *rb;
- num_volumes = ubi->vtbl_slots + UBI_INT_VOL_COUNT;
- scan_eba = kmalloc(sizeof(*scan_eba) * num_volumes, GFP_KERNEL);
- if (!scan_eba)
- return -ENOMEM;
- fm_eba = kmalloc(sizeof(*fm_eba) * num_volumes, GFP_KERNEL);
- if (!fm_eba) {
- kfree(scan_eba);
- return -ENOMEM;
- }
- for (i = 0; i < num_volumes; i++) {
- vol = ubi->volumes[i];
- if (!vol)
- continue;
- scan_eba[i] = kmalloc(vol->reserved_pebs * sizeof(**scan_eba),
- GFP_KERNEL);
- if (!scan_eba[i]) {
- ret = -ENOMEM;
- goto out_free;
- }
- fm_eba[i] = kmalloc(vol->reserved_pebs * sizeof(**fm_eba),
- GFP_KERNEL);
- if (!fm_eba[i]) {
- ret = -ENOMEM;
- goto out_free;
- }
- for (j = 0; j < vol->reserved_pebs; j++)
- scan_eba[i][j] = fm_eba[i][j] = UBI_LEB_UNMAPPED;
- av = ubi_find_av(ai_scan, idx2vol_id(ubi, i));
- if (!av)
- continue;
- ubi_rb_for_each_entry(rb, aeb, &av->root, u.rb)
- scan_eba[i][aeb->lnum] = aeb->pnum;
- av = ubi_find_av(ai_fastmap, idx2vol_id(ubi, i));
- if (!av)
- continue;
- ubi_rb_for_each_entry(rb, aeb, &av->root, u.rb)
- fm_eba[i][aeb->lnum] = aeb->pnum;
- for (j = 0; j < vol->reserved_pebs; j++) {
- if (scan_eba[i][j] != fm_eba[i][j]) {
- if (scan_eba[i][j] == UBI_LEB_UNMAPPED ||
- fm_eba[i][j] == UBI_LEB_UNMAPPED)
- continue;
- ubi_err("LEB:%i:%i is PEB:%i instead of %i!",
- vol->vol_id, i, fm_eba[i][j],
- scan_eba[i][j]);
- ubi_assert(0);
- }
- }
- }
- out_free:
- for (i = 0; i < num_volumes; i++) {
- if (!ubi->volumes[i])
- continue;
- kfree(scan_eba[i]);
- kfree(fm_eba[i]);
- }
- kfree(scan_eba);
- kfree(fm_eba);
- return ret;
- }
- /**
- * ubi_eba_init - initialize the EBA sub-system using attaching information.
- * @ubi: UBI device description object
- * @ai: attaching information
- *
- * This function returns zero in case of success and a negative error code in
- * case of failure.
- */
- int ubi_eba_init(struct ubi_device *ubi, struct ubi_attach_info *ai)
- {
- int i, j, err, num_volumes;
- struct ubi_ainf_volume *av;
- struct ubi_volume *vol;
- struct ubi_ainf_peb *aeb;
- struct rb_node *rb;
- dbg_eba("initialize EBA sub-system");
- spin_lock_init(&ubi->ltree_lock);
- mutex_init(&ubi->alc_mutex);
- ubi->ltree = RB_ROOT;
- ubi->global_sqnum = ai->max_sqnum + 1;
- num_volumes = ubi->vtbl_slots + UBI_INT_VOL_COUNT;
- for (i = 0; i < num_volumes; i++) {
- 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;
- goto out_free;
- }
- for (j = 0; j < vol->reserved_pebs; j++)
- vol->eba_tbl[j] = UBI_LEB_UNMAPPED;
- 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)
- /*
- * This may happen in case of an unclean reboot
- * during re-size.
- */
- ubi_move_aeb_to_list(av, aeb, &ai->erase);
- vol->eba_tbl[aeb->lnum] = aeb->pnum;
- }
- }
- if (ubi->avail_pebs < EBA_RESERVED_PEBS) {
- ubi_err("no enough physical eraseblocks (%d, need %d)",
- ubi->avail_pebs, EBA_RESERVED_PEBS);
- if (ubi->corr_peb_count)
- ubi_err("%d PEBs are corrupted and not used",
- ubi->corr_peb_count);
- err = -ENOSPC;
- goto out_free;
- }
- ubi->avail_pebs -= EBA_RESERVED_PEBS;
- ubi->rsvd_pebs += EBA_RESERVED_PEBS;
- if (ubi->bad_allowed) {
- ubi_calculate_reserved(ubi);
- if (ubi->avail_pebs < ubi->beb_rsvd_level) {
- /* No enough free physical eraseblocks */
- ubi->beb_rsvd_pebs = ubi->avail_pebs;
- print_rsvd_warning(ubi, ai);
- } else
- ubi->beb_rsvd_pebs = ubi->beb_rsvd_level;
- ubi->avail_pebs -= ubi->beb_rsvd_pebs;
- ubi->rsvd_pebs += ubi->beb_rsvd_pebs;
- }
- dbg_eba("EBA sub-system is initialized");
- return 0;
- 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;
- }
- return err;
- }
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