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UBI: simplify recover_peb() code
recover_peb() is using a convoluted retry/exit path. Add try_recover_peb() to simplify the retry logic and make sure we have a single exit path instead of manually releasing the resource in each error path. 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
Richard Weinberger
parent
7b6b749b12
commit
f036dfeb85
@ -553,6 +553,102 @@ int ubi_eba_read_leb_sg(struct ubi_device *ubi, struct ubi_volume *vol,
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return ret;
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}
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/**
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* try_recover_peb - try to recover from write failure.
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* @vol: volume description object
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* @pnum: the physical eraseblock to recover
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* @lnum: logical eraseblock number
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* @buf: data which was not written because of the write failure
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* @offset: offset of the failed write
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* @len: how many bytes should have been written
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* @vid: VID header
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* @retry: whether the caller should retry in case of failure
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*
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* This function is called in case of a write failure and moves all good data
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* from the potentially bad physical eraseblock to a good physical eraseblock.
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* This function also writes the data which was not written due to the failure.
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* Returns 0 in case of success, and a negative error code in case of failure.
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* In case of failure, the %retry parameter is set to false if this is a fatal
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* error (retrying won't help), and true otherwise.
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*/
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static int try_recover_peb(struct ubi_volume *vol, int pnum, int lnum,
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const void *buf, int offset, int len,
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struct ubi_vid_hdr *vid_hdr, bool *retry)
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{
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struct ubi_device *ubi = vol->ubi;
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int new_pnum, err, vol_id = vol->vol_id, data_size;
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uint32_t crc;
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*retry = false;
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new_pnum = ubi_wl_get_peb(ubi);
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if (new_pnum < 0) {
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err = new_pnum;
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goto out_put;
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}
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ubi_msg(ubi, "recover PEB %d, move data to PEB %d",
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pnum, new_pnum);
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err = ubi_io_read_vid_hdr(ubi, pnum, vid_hdr, 1);
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if (err && err != UBI_IO_BITFLIPS) {
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if (err > 0)
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err = -EIO;
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goto out_put;
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}
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ubi_assert(vid_hdr->vol_type == UBI_VID_DYNAMIC);
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mutex_lock(&ubi->buf_mutex);
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memset(ubi->peb_buf + offset, 0xFF, len);
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/* Read everything before the area where the write failure happened */
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if (offset > 0) {
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err = ubi_io_read_data(ubi, ubi->peb_buf, pnum, 0, offset);
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if (err && err != UBI_IO_BITFLIPS)
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goto out_unlock;
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}
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*retry = true;
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memcpy(ubi->peb_buf + offset, buf, len);
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data_size = offset + len;
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crc = crc32(UBI_CRC32_INIT, ubi->peb_buf, data_size);
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vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
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vid_hdr->copy_flag = 1;
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vid_hdr->data_size = cpu_to_be32(data_size);
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vid_hdr->data_crc = cpu_to_be32(crc);
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err = ubi_io_write_vid_hdr(ubi, new_pnum, vid_hdr);
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if (err)
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goto out_unlock;
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err = ubi_io_write_data(ubi, ubi->peb_buf, new_pnum, 0, data_size);
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out_unlock:
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mutex_unlock(&ubi->buf_mutex);
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if (!err)
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vol->eba_tbl[lnum] = new_pnum;
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out_put:
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up_read(&ubi->fm_eba_sem);
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if (!err) {
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ubi_wl_put_peb(ubi, vol_id, lnum, pnum, 1);
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ubi_msg(ubi, "data was successfully recovered");
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} else if (new_pnum >= 0) {
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/*
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* Bad luck? This physical eraseblock is bad too? Crud. Let's
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* try to get another one.
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*/
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ubi_wl_put_peb(ubi, vol_id, lnum, new_pnum, 1);
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ubi_warn(ubi, "failed to write to PEB %d", new_pnum);
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}
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return err;
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}
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/**
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* recover_peb - recover from write failure.
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* @ubi: UBI device description object
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@ -566,106 +662,34 @@ int ubi_eba_read_leb_sg(struct ubi_device *ubi, struct ubi_volume *vol,
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* This function is called in case of a write failure and moves all good data
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* from the potentially bad physical eraseblock to a good physical eraseblock.
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* This function also writes the data which was not written due to the failure.
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* Returns new physical eraseblock number in case of success, and a negative
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* error code in case of failure.
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* Returns 0 in case of success, and a negative error code in case of failure.
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* This function tries %UBI_IO_RETRIES before giving up.
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*/
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static int recover_peb(struct ubi_device *ubi, int pnum, int vol_id, int lnum,
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const void *buf, int offset, int len)
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{
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int err, idx = vol_id2idx(ubi, vol_id), new_pnum, data_size, tries = 0;
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int err, idx = vol_id2idx(ubi, vol_id), tries;
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struct ubi_volume *vol = ubi->volumes[idx];
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struct ubi_vid_hdr *vid_hdr;
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uint32_t crc;
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vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS);
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if (!vid_hdr)
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return -ENOMEM;
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retry:
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new_pnum = ubi_wl_get_peb(ubi);
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if (new_pnum < 0) {
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ubi_free_vid_hdr(ubi, vid_hdr);
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up_read(&ubi->fm_eba_sem);
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return new_pnum;
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for (tries = 0; tries <= UBI_IO_RETRIES; tries++) {
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bool retry;
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err = try_recover_peb(vol, pnum, lnum, buf, offset, len,
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vid_hdr, &retry);
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if (!err || !retry)
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break;
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ubi_msg(ubi, "try again");
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}
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ubi_msg(ubi, "recover PEB %d, move data to PEB %d",
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pnum, new_pnum);
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err = ubi_io_read_vid_hdr(ubi, pnum, vid_hdr, 1);
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if (err && err != UBI_IO_BITFLIPS) {
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if (err > 0)
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err = -EIO;
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up_read(&ubi->fm_eba_sem);
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goto out_put;
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}
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ubi_assert(vid_hdr->vol_type == UBI_VID_DYNAMIC);
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mutex_lock(&ubi->buf_mutex);
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memset(ubi->peb_buf + offset, 0xFF, len);
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/* Read everything before the area where the write failure happened */
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if (offset > 0) {
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err = ubi_io_read_data(ubi, ubi->peb_buf, pnum, 0, offset);
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if (err && err != UBI_IO_BITFLIPS) {
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up_read(&ubi->fm_eba_sem);
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goto out_unlock;
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}
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}
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memcpy(ubi->peb_buf + offset, buf, len);
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data_size = offset + len;
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crc = crc32(UBI_CRC32_INIT, ubi->peb_buf, data_size);
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vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
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vid_hdr->copy_flag = 1;
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vid_hdr->data_size = cpu_to_be32(data_size);
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vid_hdr->data_crc = cpu_to_be32(crc);
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err = ubi_io_write_vid_hdr(ubi, new_pnum, vid_hdr);
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if (err) {
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mutex_unlock(&ubi->buf_mutex);
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up_read(&ubi->fm_eba_sem);
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goto write_error;
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}
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err = ubi_io_write_data(ubi, ubi->peb_buf, new_pnum, 0, data_size);
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if (err) {
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mutex_unlock(&ubi->buf_mutex);
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up_read(&ubi->fm_eba_sem);
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goto write_error;
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}
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mutex_unlock(&ubi->buf_mutex);
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ubi_free_vid_hdr(ubi, vid_hdr);
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vol->eba_tbl[lnum] = new_pnum;
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up_read(&ubi->fm_eba_sem);
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ubi_wl_put_peb(ubi, vol_id, lnum, pnum, 1);
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ubi_msg(ubi, "data was successfully recovered");
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return 0;
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out_unlock:
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mutex_unlock(&ubi->buf_mutex);
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out_put:
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ubi_wl_put_peb(ubi, vol_id, lnum, new_pnum, 1);
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ubi_free_vid_hdr(ubi, vid_hdr);
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return err;
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write_error:
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/*
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* Bad luck? This physical eraseblock is bad too? Crud. Let's try to
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* get another one.
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*/
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ubi_warn(ubi, "failed to write to PEB %d", new_pnum);
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ubi_wl_put_peb(ubi, vol_id, lnum, new_pnum, 1);
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if (++tries > UBI_IO_RETRIES) {
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ubi_free_vid_hdr(ubi, vid_hdr);
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return err;
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}
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ubi_msg(ubi, "try again");
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goto retry;
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}
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/**
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