Example #1
0
/**
 * ubifs_write_node - write node to the media.
 * @c: UBIFS file-system description object
 * @buf: the node to write
 * @len: node length
 * @lnum: logical eraseblock number
 * @offs: offset within the logical eraseblock
 * @dtype: node life-time hint (%UBI_LONGTERM, %UBI_SHORTTERM, %UBI_UNKNOWN)
 *
 * This function automatically fills node magic number, assigns sequence
 * number, and calculates node CRC checksum. The length of the @buf buffer has
 * to be aligned to the minimal I/O unit size. This function automatically
 * appends padding node and padding bytes if needed. Returns zero in case of
 * success and a negative error code in case of failure.
 */
int ubifs_write_node(struct ubifs_info *c, void *buf, int len, int lnum,
		     int offs, int dtype)
{
	int err, buf_len = ALIGN(len, c->min_io_size);

	dbg_io("LEB %d:%d, %s, length %d (aligned %d)",
	       lnum, offs, dbg_ntype(((struct ubifs_ch *)buf)->node_type), len,
	       buf_len);
	ubifs_assert(lnum >= 0 && lnum < c->leb_cnt && offs >= 0);
	ubifs_assert(offs % c->min_io_size == 0 && offs < c->leb_size);
	ubifs_assert(!c->ro_media && !c->ro_mount);
	ubifs_assert(!c->space_fixup);

	if (c->ro_error)
		return -EROFS;

	ubifs_prepare_node(c, buf, len, 1);
	err = ubi_leb_write(c->ubi, lnum, buf, offs, buf_len, dtype);
	if (err) {
		ubifs_err("cannot write %d bytes to LEB %d:%d, error %d",
			  buf_len, lnum, offs, err);
		dbg_dump_node(c, buf);
		dbg_dump_stack();
	}

	return err;
}
Example #2
0
/**
 * ubifs_check_node - check node.
 * @c: UBIFS file-system description object
 * @buf: node to check
 * @lnum: logical eraseblock number
 * @offs: offset within the logical eraseblock
 * @quiet: print no messages
 *
 * This function checks node magic number and CRC checksum. This function also
 * validates node length to prevent UBIFS from becoming crazy when an attacker
 * feeds it a file-system image with incorrect nodes. For example, too large
 * node length in the common header could cause UBIFS to read memory outside of
 * allocated buffer when checking the CRC checksum.
 *
 * This function returns zero in case of success %-EUCLEAN in case of bad CRC
 * or magic.
 */
int ubifs_check_node(const struct ubifs_info *c, const void *buf, int lnum,
		     int offs, int quiet)
{
	int err = -EINVAL, type, node_len;
	uint32_t crc, node_crc, magic;
	const struct ubifs_ch *ch = buf;

	ubifs_assert(lnum >= 0 && lnum < c->leb_cnt && offs >= 0);
	ubifs_assert(!(offs & 7) && offs < c->leb_size);

	magic = le32_to_cpu(ch->magic);
	if (magic != UBIFS_NODE_MAGIC) {
		if (!quiet)
			ubifs_err("bad magic %#08x, expected %#08x",
				  magic, UBIFS_NODE_MAGIC);
		err = -EUCLEAN;
		goto out;
	}

	type = ch->node_type;
	if (type < 0 || type >= UBIFS_NODE_TYPES_CNT) {
		if (!quiet)
			ubifs_err("bad node type %d", type);
		goto out;
	}

	node_len = le32_to_cpu(ch->len);
	if (node_len + offs > c->leb_size)
		goto out_len;

	if (c->ranges[type].max_len == 0) {
		if (node_len != c->ranges[type].len)
			goto out_len;
	} else if (node_len < c->ranges[type].min_len ||
		   node_len > c->ranges[type].max_len)
		goto out_len;

	crc = crc32(UBIFS_CRC32_INIT, buf + 8, node_len - 8);
	node_crc = le32_to_cpu(ch->crc);
	if (crc != node_crc) {
		if (!quiet)
			ubifs_err("bad CRC: calculated %#08x, read %#08x",
				  crc, node_crc);
		err = -EUCLEAN;
		goto out;
	}

	return 0;

out_len:
	if (!quiet)
		ubifs_err("bad node length %d", node_len);
out:
	if (!quiet) {
		ubifs_err("bad node at LEB %d:%d", lnum, offs);
		dbg_dump_node(c, buf);
		dbg_dump_stack();
	}
	return err;
}
Example #3
0
File: io.c Project: aircross/ray
/**
 * ubifs_ro_mode - switch UBIFS to read read-only mode.
 * @c: UBIFS file-system description object
 * @err: error code which is the reason of switching to R/O mode
 */
void ubifs_ro_mode(struct ubifs_info *c, int err)
{
	if (!c->ro_media) {
		c->ro_media = 1;
		c->no_chk_data_crc = 0;
		ubifs_warn("switched to read-only mode, error %d", err);
		dbg_dump_stack();
	}
}
Example #4
0
/**
 * ubifs_ro_mode - switch UBIFS to read read-only mode.
 * @c: UBIFS file-system description object
 * @err: error code which is the reason of switching to R/O mode
 */
void ubifs_ro_mode(struct ubifs_info *c, int err)
{
	if (!c->ro_error) {
		c->ro_error = 1;
		c->no_chk_data_crc = 0;
		c->vfs_sb->s_flags |= MS_RDONLY;
		ubifs_warn("switched to read-only mode, error %d", err);
		dbg_dump_stack();
	}
}
Example #5
0
/**
 * ubifs_read_node - read node.
 * @c: UBIFS file-system description object
 * @buf: buffer to read to
 * @type: node type
 * @len: node length (not aligned)
 * @lnum: logical eraseblock number
 * @offs: offset within the logical eraseblock
 *
 * This function reads a node of known type and and length, checks it and
 * stores in @buf. Returns zero in case of success, %-EUCLEAN if CRC mismatched
 * and a negative error code in case of failure.
 */
int ubifs_read_node(const struct ubifs_info *c, void *buf, int type, int len,
		    int lnum, int offs)
{
	int err, l;
	struct ubifs_ch *ch = buf;
       int try_count = 0;

	dbg_io("LEB %d:%d, %s, length %d", lnum, offs, dbg_ntype(type), len);
	ubifs_assert(lnum >= 0 && lnum < c->leb_cnt && offs >= 0);
	ubifs_assert(len >= UBIFS_CH_SZ && offs + len <= c->leb_size);
	ubifs_assert(!(offs & 7) && offs < c->leb_size);
	ubifs_assert(type >= 0 && type < UBIFS_NODE_TYPES_CNT);

try_read:
	err = ubi_read(c->ubi, lnum, buf, offs, len);
	if (err && err != -EBADMSG) {
		ubifs_err("cannot read node %d from LEB %d:%d, error %d",
			  type, lnum, offs, err);
		return err;
	}

	if (type != ch->node_type) {
		ubifs_err("bad node type (%d but expected %d)",
			  ch->node_type, type);
		goto out;
	}

	err = ubifs_check_node(c, buf, lnum, offs, 0, 0);
	if (err) {
		ubifs_err("expected node type %d", type);
              if(try_count < 3){
                  try_count++;
                  udelay(100);
                  goto try_read;
              }
              else{
		   return err;
              }
	}

	l = le32_to_cpu(ch->len);
	if (l != len) {
		ubifs_err("bad node length %d, expected %d", l, len);
		goto out;
	}

	return 0;

out:
	ubifs_err("bad node at LEB %d:%d, LEB mapping status %d", lnum, offs,
		  ubi_is_mapped(c->ubi, lnum));
	dbg_dump_node(c, buf);
	dbg_dump_stack();
	return -EINVAL;
}
Example #6
0
int ubifs_is_mapped(const struct ubifs_info *c, int lnum)
{
	int err;

	err = ubi_is_mapped(c->ubi, lnum);
	if (err < 0) {
		ubifs_err("ubi_is_mapped failed for LEB %d, error %d",
			  lnum, err);
		dbg_dump_stack();
	}
	return err;
}
Example #7
0
/**
 * ubifs_read_node - read node.
 * @c: UBIFS file-system description object
 * @buf: buffer to read to
 * @type: node type
 * @len: node length (not aligned)
 * @lnum: logical eraseblock number
 * @offs: offset within the logical eraseblock
 *
 * This function reads a node of known type and and length, checks it and
 * stores in @buf. Returns zero in case of success, %-EUCLEAN if CRC mismatched
 * and a negative error code in case of failure.
 */
int ubifs_read_node(const struct ubifs_info *c, void *buf, int type, int len,
		    int lnum, int offs)
{
	int err, l;
	struct ubifs_ch *ch = buf;
#if defined(FEATURE_UBIFS_PERF_INDEX)
	unsigned long long time1 = sched_clock();
#endif

	dbg_io("LEB %d:%d, %s, length %d", lnum, offs, dbg_ntype(type), len);
	ubifs_assert(lnum >= 0 && lnum < c->leb_cnt && offs >= 0);
	ubifs_assert(len >= UBIFS_CH_SZ && offs + len <= c->leb_size);
	ubifs_assert(!(offs & 7) && offs < c->leb_size);
	ubifs_assert(type >= 0 && type < UBIFS_NODE_TYPES_CNT);

	err = ubifs_leb_read(c, lnum, buf, offs, len, 0);
	if (err && err != -EBADMSG)
		return err;

	if (type != ch->node_type) {
		ubifs_err("bad node type (%d but expected %d)",
			  ch->node_type, type);
		goto out;
	}

	err = ubifs_check_node(c, buf, lnum, offs, 0, 0);
	if (err) {
		ubifs_err("expected node type %d", type);
		return err;
	}

	l = le32_to_cpu(ch->len);
	if (l != len) {
		ubifs_err("bad node length %d, expected %d", l, len);
		goto out;
	}

#if defined(FEATURE_UBIFS_PERF_INDEX)
	if(type == UBIFS_DATA_NODE) {
		ubifs_perf_lrcount(sched_clock() - time1, len);
	}
#endif
	return 0;

out:
	ubifs_err("bad node at LEB %d:%d, LEB mapping status %d", lnum, offs,
		  ubi_is_mapped(c->ubi, lnum));
	dbg_dump_node(c, buf);
	dbg_dump_stack();
	return -EINVAL;
}
Example #8
0
int ubifs_leb_read(const struct ubifs_info *c, int lnum, void *buf, int offs,
		   int len, int even_ebadmsg)
{
	int err;

	err = ubi_leb_read(c->ubi, lnum, buf, offs, len, 0);
	/*
	 * In case of %-EBADMSG print the error message only if the
	 * @even_ebadmsg is true.
	 */
	if (err && (err != -EBADMSG || even_ebadmsg)) {
		ubifs_err("reading %d bytes from LEB %d:%d failed, error %d",
			  len, lnum, offs, err);
		dbg_dump_stack();
	}
	return err;
}
Example #9
0
int ubifs_leb_map(struct ubifs_info *c, int lnum)
{
	int err;

	ubifs_assert(!c->ro_media && !c->ro_mount);
	if (c->ro_error)
		return -EROFS;
	if (!dbg_is_tst_rcvry(c))
		err = ubi_leb_map(c->ubi, lnum);
	else
		err = dbg_leb_map(c, lnum);
	if (err) {
		ubifs_err("mapping LEB %d failed, error %d", lnum, err);
		ubifs_ro_mode(c, err);
		dbg_dump_stack();
	}
	return err;
}
Example #10
0
int ubifs_leb_change(struct ubifs_info *c, int lnum, const void *buf, int len)
{
	int err;

	ubifs_assert(!c->ro_media && !c->ro_mount);
	if (c->ro_error)
		return -EROFS;
	if (!dbg_is_tst_rcvry(c))
		err = ubi_leb_change(c->ubi, lnum, buf, len);
	else
		err = dbg_leb_change(c, lnum, buf, len);
	if (err) {
		ubifs_err("changing %d bytes in LEB %d failed, error %d",
			  len, lnum, err);
		ubifs_ro_mode(c, err);
		dbg_dump_stack();
	}
	return err;
}
Example #11
0
File: io.c Project: aircross/ray
/**
 * ubifs_wbuf_sync_nolock - synchronize write-buffer.
 * @wbuf: write-buffer to synchronize
 *
 * This function synchronizes write-buffer @buf and returns zero in case of
 * success or a negative error code in case of failure.
 */
int ubifs_wbuf_sync_nolock(struct ubifs_wbuf *wbuf)
{
	struct ubifs_info *c = wbuf->c;
	int err, dirt;

	cancel_wbuf_timer_nolock(wbuf);
	if (!wbuf->used || wbuf->lnum == -1)
		/* Write-buffer is empty or not seeked */
		return 0;

	dbg_io("LEB %d:%d, %d bytes",
	       wbuf->lnum, wbuf->offs, wbuf->used);
	ubifs_assert(!(c->vfs_sb->s_flags & MS_RDONLY));
	ubifs_assert(!(wbuf->avail & 7));
	ubifs_assert(wbuf->offs + c->min_io_size <= c->leb_size);

	if (c->ro_media)
		return -EROFS;

	ubifs_pad(c, wbuf->buf + wbuf->used, wbuf->avail);
	err = ubi_leb_write(c->ubi, wbuf->lnum, wbuf->buf, wbuf->offs,
			    c->min_io_size, wbuf->dtype);
	if (err) {
		ubifs_err("cannot write %d bytes to LEB %d:%d",
			  c->min_io_size, wbuf->lnum, wbuf->offs);
		dbg_dump_stack();
		return err;
	}

	dirt = wbuf->avail;

	spin_lock(&wbuf->lock);
	wbuf->offs += c->min_io_size;
	wbuf->avail = c->min_io_size;
	wbuf->used = 0;
	wbuf->next_ino = 0;
	spin_unlock(&wbuf->lock);

	if (wbuf->sync_callback)
		err = wbuf->sync_callback(c, wbuf->lnum,
					  c->leb_size - wbuf->offs, dirt);
	return err;
}
Example #12
0
int ubifs_leb_write(struct ubifs_info *c, int lnum, const void *buf, int offs,
		    int len, int dtype)
{
	int err;

	ubifs_assert(!c->ro_media && !c->ro_mount);
	if (c->ro_error)
		return -EROFS;
	if (!dbg_is_tst_rcvry(c))
		err = ubi_leb_write(c->ubi, lnum, buf, offs, len, dtype);
	else
		err = dbg_leb_write(c, lnum, buf, offs, len, dtype);
	if (err) {
		ubifs_err("writing %d bytes to LEB %d:%d failed, error %d",
			  len, lnum, offs, err);
		ubifs_ro_mode(c, err);
		dbg_dump_stack();
	}
	return err;
}
Example #13
0
/**
 * make_reservation - reserve journal space.
 * @c: UBIFS file-system description object
 * @jhead: journal head
 * @len: how many bytes to reserve
 *
 * This function makes space reservation in journal head @jhead. The function
 * takes the commit lock and locks the journal head, and the caller has to
 * unlock the head and finish the reservation with 'finish_reservation()'.
 * Returns zero in case of success and a negative error code in case of
 * failure.
 *
 * Note, the journal head may be unlocked as soon as the data is written, while
 * the commit lock has to be released after the data has been added to the
 * TNC.
 */
static int make_reservation(struct ubifs_info *c, int jhead, int len)
{
	int err, cmt_retries = 0, nospc_retries = 0;

	ubifs_assert(len <= c->dark_wm);

again:
	down_read(&c->commit_sem);
	err = reserve_space(c, jhead, len);
	if (!err)
		return 0;
	up_read(&c->commit_sem);

	if (err == -ENOSPC) {
		/*
		 * GC could not make any progress. We should try to commit
		 * once because it could make some dirty space and GC would
		 * make progress, so make the error -EAGAIN so that the below
		 * will commit and re-try.
		 */
		if (nospc_retries++ < 2) {
			dbg_jrn("no space, retry");
			err = -EAGAIN;
		}

		/*
		 * This means that the budgeting is incorrect. We always have
		 * to be able to write to the media, because all operations are
		 * budgeted. Deletions are not budgeted, though, but we reserve
		 * an extra LEB for them.
		 */
	}

	if (err != -EAGAIN)
		goto out;

	/*
	 * -EAGAIN means that the journal is full or too large, or the above
	 * code wants to do one commit. Do this and re-try.
	 */
	if (cmt_retries > 128) {
		/*
		 * This should not happen unless the journal size limitations
		 * are too tough.
		 */
		ubifs_err("stuck in space allocation");
		err = -ENOSPC;
		goto out;
	} else if (cmt_retries > 32)
		ubifs_warn("too many space allocation re-tries (%d)",
			   cmt_retries);

	dbg_jrn("-EAGAIN, commit and retry (retried %d times)",
		cmt_retries);
	cmt_retries += 1;

	err = ubifs_run_commit(c);
	if (err)
		return err;
	goto again;

out:
	ubifs_err("cannot reserve %d bytes in jhead %d, error %d",
		  len, jhead, err);
	if (err == -ENOSPC) {
		/* This are some budgeting problems, print useful information */
		down_write(&c->commit_sem);
		spin_lock(&c->space_lock);
		dbg_dump_stack();
		dbg_dump_budg(c);
		spin_unlock(&c->space_lock);
		dbg_dump_lprops(c);
		cmt_retries = dbg_check_lprops(c);
		up_write(&c->commit_sem);
	}

	return err;
}
Example #14
0
/**
 * ubifs_read_node_wbuf - read node from the media or write-buffer.
 * @wbuf: wbuf to check for un-written data
 * @buf: buffer to read to
 * @type: node type
 * @len: node length
 * @lnum: logical eraseblock number
 * @offs: offset within the logical eraseblock
 *
 * This function reads a node of known type and length, checks it and stores
 * in @buf. If the node partially or fully sits in the write-buffer, this
 * function takes data from the buffer, otherwise it reads the flash media.
 * Returns zero in case of success, %-EUCLEAN if CRC mismatched and a negative
 * error code in case of failure.
 */
int ubifs_read_node_wbuf(struct ubifs_wbuf *wbuf, void *buf, int type, int len,
			 int lnum, int offs)
{
	const struct ubifs_info *c = wbuf->c;
	int err, rlen, overlap;
	struct ubifs_ch *ch = buf;
#if defined(FEATURE_UBIFS_PERF_INDEX)
	unsigned long long time1 = sched_clock();
	int log_len = 0;
#endif

	dbg_io("LEB %d:%d, %s, length %d, jhead %s", lnum, offs,
	       dbg_ntype(type), len, dbg_jhead(wbuf->jhead));
	ubifs_assert(wbuf && lnum >= 0 && lnum < c->leb_cnt && offs >= 0);
	ubifs_assert(!(offs & 7) && offs < c->leb_size);
	ubifs_assert(type >= 0 && type < UBIFS_NODE_TYPES_CNT);

	spin_lock(&wbuf->lock);
	overlap = (lnum == wbuf->lnum && offs + len > wbuf->offs);
	if (!overlap) {
		/* We may safely unlock the write-buffer and read the data */
		spin_unlock(&wbuf->lock);
		return ubifs_read_node(c, buf, type, len, lnum, offs);
	}

	/* Don't read under wbuf */
	rlen = wbuf->offs - offs;
	if (rlen < 0)
		rlen = 0;

	/* Copy the rest from the write-buffer */
	memcpy(buf + rlen, wbuf->buf + offs + rlen - wbuf->offs, len - rlen);
	spin_unlock(&wbuf->lock);

	if (rlen > 0) {
		/* Read everything that goes before write-buffer */
		err = ubifs_leb_read(c, lnum, buf, offs, rlen, 0);
		if (err && err != -EBADMSG)
			return err;
	}

	if (type != ch->node_type) {
		ubifs_err("bad node type (%d but expected %d)",
			  ch->node_type, type);
		goto out;
	}

	err = ubifs_check_node(c, buf, lnum, offs, 0, 0);
	if (err) {
		ubifs_err("expected node type %d", type);
		return err;
	}

	rlen = le32_to_cpu(ch->len);
	if (rlen != len) {
		ubifs_err("bad node length %d, expected %d", rlen, len);
		goto out;
	}

#if defined(FEATURE_UBIFS_PERF_INDEX)
	if(log_len > 0) {
		ubifs_perf_lrcount(sched_clock() - time1, log_len);
	}
#endif
	return 0;

out:
	ubifs_err("bad node at LEB %d:%d", lnum, offs);
	dbg_dump_node(c, buf);
	dbg_dump_stack();
	return -EINVAL;
}
Example #15
0
/**
 * ubifs_wbuf_write_nolock - write data to flash via write-buffer.
 * @wbuf: write-buffer
 * @buf: node to write
 * @len: node length
 *
 * This function writes data to flash via write-buffer @wbuf. This means that
 * the last piece of the node won't reach the flash media immediately if it
 * does not take whole max. write unit (@c->max_write_size). Instead, the node
 * will sit in RAM until the write-buffer is synchronized (e.g., by timer, or
 * because more data are appended to the write-buffer).
 *
 * This function returns zero in case of success and a negative error code in
 * case of failure. If the node cannot be written because there is no more
 * space in this logical eraseblock, %-ENOSPC is returned.
 */
int ubifs_wbuf_write_nolock(struct ubifs_wbuf *wbuf, void *buf, int len)
{
	struct ubifs_info *c = wbuf->c;
	int err, written, n, aligned_len = ALIGN(len, 8);

	dbg_io("%d bytes (%s) to jhead %s wbuf at LEB %d:%d", len,
	       dbg_ntype(((struct ubifs_ch *)buf)->node_type),
	       dbg_jhead(wbuf->jhead), wbuf->lnum, wbuf->offs + wbuf->used);
	ubifs_assert(len > 0 && wbuf->lnum >= 0 && wbuf->lnum < c->leb_cnt);
	ubifs_assert(wbuf->offs >= 0 && wbuf->offs % c->min_io_size == 0);
	ubifs_assert(!(wbuf->offs & 7) && wbuf->offs <= c->leb_size);
	ubifs_assert(wbuf->avail > 0 && wbuf->avail <= wbuf->size);
	ubifs_assert(wbuf->size >= c->min_io_size);
	ubifs_assert(wbuf->size <= c->max_write_size);
	ubifs_assert(wbuf->size % c->min_io_size == 0);
	ubifs_assert(mutex_is_locked(&wbuf->io_mutex));
	ubifs_assert(!c->ro_media && !c->ro_mount);
	ubifs_assert(!c->space_fixup);
	if (c->leb_size - wbuf->offs >= c->max_write_size)
		ubifs_assert(!((wbuf->offs + wbuf->size) % c->max_write_size));

	if (c->leb_size - wbuf->offs - wbuf->used < aligned_len) {
		err = -ENOSPC;
		goto out;
	}

	cancel_wbuf_timer_nolock(wbuf);

	if (c->ro_error)
		return -EROFS;

	if (aligned_len <= wbuf->avail) {
		/*
		 * The node is not very large and fits entirely within
		 * write-buffer.
		 */
		memcpy(wbuf->buf + wbuf->used, buf, len);

		if (aligned_len == wbuf->avail) {
			dbg_io("flush jhead %s wbuf to LEB %d:%d",
			       dbg_jhead(wbuf->jhead), wbuf->lnum, wbuf->offs);
#if defined(FEATURE_UBIFS_PERF_INDEX)
			if(wbuf->jhead == DATAHD)
				err = ubifs_leb_write_log(c, wbuf->lnum, wbuf->buf, 
						wbuf->offs, wbuf->size);
			else
#endif
			err = ubifs_leb_write(c, wbuf->lnum, wbuf->buf,
					      wbuf->offs, wbuf->size);
			if (err)
				goto out;
			wbuf->w_count += wbuf->size; //MTK

			spin_lock(&wbuf->lock);
			wbuf->offs += wbuf->size;
			if (c->leb_size - wbuf->offs >= c->max_write_size)
				wbuf->size = c->max_write_size;
			else
				wbuf->size = c->leb_size - wbuf->offs;
			wbuf->avail = wbuf->size;
			wbuf->used = 0;
			wbuf->next_ino = 0;
			spin_unlock(&wbuf->lock);
		} else {
			spin_lock(&wbuf->lock);
			wbuf->avail -= aligned_len;
			wbuf->used += aligned_len;
			spin_unlock(&wbuf->lock);
		}

		goto exit;
	}

	written = 0;

	if (wbuf->used) {
		/*
		 * The node is large enough and does not fit entirely within
		 * current available space. We have to fill and flush
		 * write-buffer and switch to the next max. write unit.
		 */
		dbg_io("flush jhead %s wbuf to LEB %d:%d",
		       dbg_jhead(wbuf->jhead), wbuf->lnum, wbuf->offs);
		memcpy(wbuf->buf + wbuf->used, buf, wbuf->avail);
#if defined(FEATURE_UBIFS_PERF_INDEX)
	if(wbuf->jhead == DATAHD)
		err = ubifs_leb_write_log(c, wbuf->lnum, wbuf->buf, wbuf->offs, 
			                  wbuf->size);
	else
#endif
		err = ubifs_leb_write(c, wbuf->lnum, wbuf->buf, wbuf->offs,
				      wbuf->size);
		if (err)
			goto out;
		wbuf->w_count += wbuf->size; //MTK

		wbuf->offs += wbuf->size;
		len -= wbuf->avail;
		aligned_len -= wbuf->avail;
		written += wbuf->avail;
	} else if (wbuf->offs & (c->max_write_size - 1)) {
		/*
		 * The write-buffer offset is not aligned to
		 * @c->max_write_size and @wbuf->size is less than
		 * @c->max_write_size. Write @wbuf->size bytes to make sure the
		 * following writes are done in optimal @c->max_write_size
		 * chunks.
		 */
		dbg_io("write %d bytes to LEB %d:%d",
		       wbuf->size, wbuf->lnum, wbuf->offs);
#if defined(FEATURE_UBIFS_PERF_INDEX)
	if(wbuf->jhead == DATAHD)
		err = ubifs_leb_write_log(c, wbuf->lnum, wbuf->buf, wbuf->offs, 
			                  wbuf->size);
	else
#endif
		err = ubifs_leb_write(c, wbuf->lnum, buf, wbuf->offs,
				      wbuf->size);
		if (err)
			goto out;
		wbuf->w_count += wbuf->size; //MTK

		wbuf->offs += wbuf->size;
		len -= wbuf->size;
		aligned_len -= wbuf->size;
		written += wbuf->size;
	}

	/*
	 * The remaining data may take more whole max. write units, so write the
	 * remains multiple to max. write unit size directly to the flash media.
	 * We align node length to 8-byte boundary because we anyway flash wbuf
	 * if the remaining space is less than 8 bytes.
	 */
	n = aligned_len >> c->max_write_shift;
	if (n) {
		n <<= c->max_write_shift;
		dbg_io("write %d bytes to LEB %d:%d", n, wbuf->lnum,
		       wbuf->offs);
#if defined(FEATURE_UBIFS_PERF_INDEX)
	if(wbuf->jhead == DATAHD)
		err = ubifs_leb_write_log(c, wbuf->lnum, buf + written,
				          wbuf->offs, n);
	else
#endif
		err = ubifs_leb_write(c, wbuf->lnum, buf + written,
				      wbuf->offs, n);
		if (err)
			goto out;
		wbuf->w_count += n; //MTK
		wbuf->offs += n;
		aligned_len -= n;
		len -= n;
		written += n;
	}

	spin_lock(&wbuf->lock);
	if (aligned_len)
		/*
		 * And now we have what's left and what does not take whole
		 * max. write unit, so write it to the write-buffer and we are
		 * done.
		 */
		memcpy(wbuf->buf, buf + written, len);

	if (c->leb_size - wbuf->offs >= c->max_write_size)
		wbuf->size = c->max_write_size;
	else
		wbuf->size = c->leb_size - wbuf->offs;
	wbuf->avail = wbuf->size - aligned_len;
	wbuf->used = aligned_len;
	wbuf->next_ino = 0;
	spin_unlock(&wbuf->lock);

exit:
	if (wbuf->sync_callback) {
		int free = c->leb_size - wbuf->offs - wbuf->used;

		err = wbuf->sync_callback(c, wbuf->lnum, free, 0);
		if (err)
			goto out;
	}

	if (wbuf->used)
		new_wbuf_timer_nolock(wbuf);

	return 0;

out:
	ubifs_err("cannot write %d bytes to LEB %d:%d, error %d",
		  len, wbuf->lnum, wbuf->offs, err);
	dbg_dump_node(c, buf);
	dbg_dump_stack();
	dbg_dump_leb(c, wbuf->lnum);
	return err;
}
Example #16
0
/**
 * ubifs_wbuf_sync_nolock - synchronize write-buffer.
 * @wbuf: write-buffer to synchronize
 *
 * This function synchronizes write-buffer @buf and returns zero in case of
 * success or a negative error code in case of failure.
 *
 * Note, although write-buffers are of @c->max_write_size, this function does
 * not necessarily writes all @c->max_write_size bytes to the flash. Instead,
 * if the write-buffer is only partially filled with data, only the used part
 * of the write-buffer (aligned on @c->min_io_size boundary) is synchronized.
 * This way we waste less space.
 */
int ubifs_wbuf_sync_nolock(struct ubifs_wbuf *wbuf)
{
	struct ubifs_info *c = wbuf->c;
	int err, dirt, sync_len;

	cancel_wbuf_timer_nolock(wbuf);
	if (!wbuf->used || wbuf->lnum == -1)
		/* Write-buffer is empty or not seeked */
		return 0;

	dbg_io("LEB %d:%d, %d bytes, jhead %s",
	       wbuf->lnum, wbuf->offs, wbuf->used, dbg_jhead(wbuf->jhead));
	ubifs_assert(!(wbuf->avail & 7));
	ubifs_assert(wbuf->offs + wbuf->size <= c->leb_size);
	ubifs_assert(wbuf->size >= c->min_io_size);
	ubifs_assert(wbuf->size <= c->max_write_size);
	ubifs_assert(wbuf->size % c->min_io_size == 0);
	ubifs_assert(!c->ro_media && !c->ro_mount);
	if (c->leb_size - wbuf->offs >= c->max_write_size)
		ubifs_assert(!((wbuf->offs + wbuf->size) % c->max_write_size));

	if (c->ro_error)
		return -EROFS;

	/*
	 * Do not write whole write buffer but write only the minimum necessary
	 * amount of min. I/O units.
	 */
	sync_len = ALIGN(wbuf->used, c->min_io_size);
	dirt = sync_len - wbuf->used;
	if (dirt)
		ubifs_pad(c, wbuf->buf + wbuf->used, dirt);
	err = ubi_leb_write(c->ubi, wbuf->lnum, wbuf->buf, wbuf->offs,
			    sync_len, wbuf->dtype);
	if (err) {
		ubifs_err("cannot write %d bytes to LEB %d:%d",
			  sync_len, wbuf->lnum, wbuf->offs);
		dbg_dump_stack();
		return err;
	}

	spin_lock(&wbuf->lock);
	wbuf->offs += sync_len;
	/*
	 * Now @wbuf->offs is not necessarily aligned to @c->max_write_size.
	 * But our goal is to optimize writes and make sure we write in
	 * @c->max_write_size chunks and to @c->max_write_size-aligned offset.
	 * Thus, if @wbuf->offs is not aligned to @c->max_write_size now, make
	 * sure that @wbuf->offs + @wbuf->size is aligned to
	 * @c->max_write_size. This way we make sure that after next
	 * write-buffer flush we are again at the optimal offset (aligned to
	 * @c->max_write_size).
	 */
	if (c->leb_size - wbuf->offs < c->max_write_size)
		wbuf->size = c->leb_size - wbuf->offs;
	else if (wbuf->offs & (c->max_write_size - 1))
		wbuf->size = ALIGN(wbuf->offs, c->max_write_size) - wbuf->offs;
	else
		wbuf->size = c->max_write_size;
	wbuf->avail = wbuf->size;
	wbuf->used = 0;
	wbuf->next_ino = 0;
	spin_unlock(&wbuf->lock);

	if (wbuf->sync_callback)
		err = wbuf->sync_callback(c, wbuf->lnum,
					  c->leb_size - wbuf->offs, dirt);
	return err;
}
Example #17
0
File: io.c Project: aircross/ray
/**
 * ubifs_read_node_wbuf - read node from the media or write-buffer.
 * @wbuf: wbuf to check for un-written data
 * @buf: buffer to read to
 * @type: node type
 * @len: node length
 * @lnum: logical eraseblock number
 * @offs: offset within the logical eraseblock
 *
 * This function reads a node of known type and length, checks it and stores
 * in @buf. If the node partially or fully sits in the write-buffer, this
 * function takes data from the buffer, otherwise it reads the flash media.
 * Returns zero in case of success, %-EUCLEAN if CRC mismatched and a negative
 * error code in case of failure.
 */
int ubifs_read_node_wbuf(struct ubifs_wbuf *wbuf, void *buf, int type, int len,
			 int lnum, int offs)
{
	const struct ubifs_info *c = wbuf->c;
	int err, rlen, overlap;
	struct ubifs_ch *ch = buf;

	dbg_io("LEB %d:%d, %s, length %d", lnum, offs, dbg_ntype(type), len);
	ubifs_assert(wbuf && lnum >= 0 && lnum < c->leb_cnt && offs >= 0);
	ubifs_assert(!(offs & 7) && offs < c->leb_size);
	ubifs_assert(type >= 0 && type < UBIFS_NODE_TYPES_CNT);

	spin_lock(&wbuf->lock);
	overlap = (lnum == wbuf->lnum && offs + len > wbuf->offs);
	if (!overlap) {
		/* We may safely unlock the write-buffer and read the data */
		spin_unlock(&wbuf->lock);
		return ubifs_read_node(c, buf, type, len, lnum, offs);
	}

	/* Don't read under wbuf */
	rlen = wbuf->offs - offs;
	if (rlen < 0)
		rlen = 0;

	/* Copy the rest from the write-buffer */
	memcpy(buf + rlen, wbuf->buf + offs + rlen - wbuf->offs, len - rlen);
	spin_unlock(&wbuf->lock);

	if (rlen > 0) {
		/* Read everything that goes before write-buffer */
		err = ubi_read(c->ubi, lnum, buf, offs, rlen);
		if (err && err != -EBADMSG) {
			ubifs_err("failed to read node %d from LEB %d:%d, "
				  "error %d", type, lnum, offs, err);
			dbg_dump_stack();
			return err;
		}
	}

	if (type != ch->node_type) {
		ubifs_err("bad node type (%d but expected %d)",
			  ch->node_type, type);
		goto out;
	}

	err = ubifs_check_node(c, buf, lnum, offs, 0, 0);
	if (err) {
		ubifs_err("expected node type %d", type);
		return err;
	}

	rlen = le32_to_cpu(ch->len);
	if (rlen != len) {
		ubifs_err("bad node length %d, expected %d", rlen, len);
		goto out;
	}

	return 0;

out:
	ubifs_err("bad node at LEB %d:%d", lnum, offs);
	dbg_dump_node(c, buf);
	dbg_dump_stack();
	return -EINVAL;
}
Example #18
0
File: io.c Project: aircross/ray
/**
 * ubifs_wbuf_write_nolock - write data to flash via write-buffer.
 * @wbuf: write-buffer
 * @buf: node to write
 * @len: node length
 *
 * This function writes data to flash via write-buffer @wbuf. This means that
 * the last piece of the node won't reach the flash media immediately if it
 * does not take whole minimal I/O unit. Instead, the node will sit in RAM
 * until the write-buffer is synchronized (e.g., by timer).
 *
 * This function returns zero in case of success and a negative error code in
 * case of failure. If the node cannot be written because there is no more
 * space in this logical eraseblock, %-ENOSPC is returned.
 */
int ubifs_wbuf_write_nolock(struct ubifs_wbuf *wbuf, void *buf, int len)
{
	struct ubifs_info *c = wbuf->c;
	int err, written, n, aligned_len = ALIGN(len, 8), offs;

	dbg_io("%d bytes (%s) to wbuf at LEB %d:%d", len,
	       dbg_ntype(((struct ubifs_ch *)buf)->node_type), wbuf->lnum,
	       wbuf->offs + wbuf->used);
	ubifs_assert(len > 0 && wbuf->lnum >= 0 && wbuf->lnum < c->leb_cnt);
	ubifs_assert(wbuf->offs >= 0 && wbuf->offs % c->min_io_size == 0);
	ubifs_assert(!(wbuf->offs & 7) && wbuf->offs <= c->leb_size);
	ubifs_assert(wbuf->avail > 0 && wbuf->avail <= c->min_io_size);
	ubifs_assert(mutex_is_locked(&wbuf->io_mutex));

	if (c->leb_size - wbuf->offs - wbuf->used < aligned_len) {
		err = -ENOSPC;
		goto out;
	}

	cancel_wbuf_timer_nolock(wbuf);

	if (c->ro_media)
		return -EROFS;

	if (aligned_len <= wbuf->avail) {
		/*
		 * The node is not very large and fits entirely within
		 * write-buffer.
		 */
		memcpy(wbuf->buf + wbuf->used, buf, len);

		if (aligned_len == wbuf->avail) {
			dbg_io("flush wbuf to LEB %d:%d", wbuf->lnum,
				wbuf->offs);
			err = ubi_leb_write(c->ubi, wbuf->lnum, wbuf->buf,
					    wbuf->offs, c->min_io_size,
					    wbuf->dtype);
			if (err)
				goto out;

			spin_lock(&wbuf->lock);
			wbuf->offs += c->min_io_size;
			wbuf->avail = c->min_io_size;
			wbuf->used = 0;
			wbuf->next_ino = 0;
			spin_unlock(&wbuf->lock);
		} else {
			spin_lock(&wbuf->lock);
			wbuf->avail -= aligned_len;
			wbuf->used += aligned_len;
			spin_unlock(&wbuf->lock);
		}

		goto exit;
	}

	/*
	 * The node is large enough and does not fit entirely within current
	 * minimal I/O unit. We have to fill and flush write-buffer and switch
	 * to the next min. I/O unit.
	 */
	dbg_io("flush wbuf to LEB %d:%d", wbuf->lnum, wbuf->offs);
	memcpy(wbuf->buf + wbuf->used, buf, wbuf->avail);
	err = ubi_leb_write(c->ubi, wbuf->lnum, wbuf->buf, wbuf->offs,
			    c->min_io_size, wbuf->dtype);
	if (err)
		goto out;

	offs = wbuf->offs + c->min_io_size;
	len -= wbuf->avail;
	aligned_len -= wbuf->avail;
	written = wbuf->avail;

	/*
	 * The remaining data may take more whole min. I/O units, so write the
	 * remains multiple to min. I/O unit size directly to the flash media.
	 * We align node length to 8-byte boundary because we anyway flash wbuf
	 * if the remaining space is less than 8 bytes.
	 */
	n = aligned_len >> c->min_io_shift;
	if (n) {
		n <<= c->min_io_shift;
		dbg_io("write %d bytes to LEB %d:%d", n, wbuf->lnum, offs);
		err = ubi_leb_write(c->ubi, wbuf->lnum, buf + written, offs, n,
				    wbuf->dtype);
		if (err)
			goto out;
		offs += n;
		aligned_len -= n;
		len -= n;
		written += n;
	}

	spin_lock(&wbuf->lock);
	if (aligned_len)
		/*
		 * And now we have what's left and what does not take whole
		 * min. I/O unit, so write it to the write-buffer and we are
		 * done.
		 */
		memcpy(wbuf->buf, buf + written, len);

	wbuf->offs = offs;
	wbuf->used = aligned_len;
	wbuf->avail = c->min_io_size - aligned_len;
	wbuf->next_ino = 0;
	spin_unlock(&wbuf->lock);

exit:
	if (wbuf->sync_callback) {
		int free = c->leb_size - wbuf->offs - wbuf->used;

		err = wbuf->sync_callback(c, wbuf->lnum, free, 0);
		if (err)
			goto out;
	}

	if (wbuf->used)
		new_wbuf_timer_nolock(wbuf);

	return 0;

out:
	ubifs_err("cannot write %d bytes to LEB %d:%d, error %d",
		  len, wbuf->lnum, wbuf->offs, err);
	dbg_dump_node(c, buf);
	dbg_dump_stack();
	dbg_dump_leb(c, wbuf->lnum);
	return err;
}