UBI: simplify LEB write and atomic LEB change code
ubi_eba_write_leb(), ubi_eba_write_leb_st() and ubi_eba_atomic_leb_change() are using a convoluted retry/exit path. Add the try_write_vid_and_data() function to simplify the retry logic and make sure we have a single exit path instead of manually releasing the resources 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
Родитель
f036dfeb85
Коммит
2d78aee426
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@ -692,6 +692,69 @@ static int recover_peb(struct ubi_device *ubi, int pnum, int vol_id, int lnum,
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return err;
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}
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/**
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* try_write_vid_and_data - try to write VID header and data to a new PEB.
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* @vol: volume description object
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* @lnum: logical eraseblock number
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* @vid_hdr: VID header to write
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* @buf: buffer containing the data
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* @offset: where to start writing data
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* @len: how many bytes should be written
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*
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* This function tries to write VID header and data belonging to logical
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* eraseblock @lnum of volume @vol to a new physical eraseblock. Returns zero
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* in case of success and a negative error code in case of failure.
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* In case of error, it is possible that something was still written to the
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* flash media, but may be some garbage.
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*/
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static int try_write_vid_and_data(struct ubi_volume *vol, int lnum,
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struct ubi_vid_hdr *vid_hdr, const void *buf,
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int offset, int len)
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{
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struct ubi_device *ubi = vol->ubi;
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int pnum, opnum, err, vol_id = vol->vol_id;
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pnum = ubi_wl_get_peb(ubi);
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if (pnum < 0) {
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err = pnum;
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goto out_put;
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}
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opnum = vol->eba_tbl[lnum];
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dbg_eba("write VID hdr and %d bytes at offset %d of LEB %d:%d, PEB %d",
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len, offset, vol_id, lnum, pnum);
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err = ubi_io_write_vid_hdr(ubi, pnum, vid_hdr);
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if (err) {
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ubi_warn(ubi, "failed to write VID header to LEB %d:%d, PEB %d",
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vol_id, lnum, pnum);
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goto out_put;
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}
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if (len) {
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err = ubi_io_write_data(ubi, buf, pnum, offset, len);
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if (err) {
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ubi_warn(ubi,
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"failed to write %d bytes at offset %d of LEB %d:%d, PEB %d",
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len, offset, vol_id, lnum, pnum);
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goto out_put;
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}
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}
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vol->eba_tbl[lnum] = pnum;
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out_put:
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up_read(&ubi->fm_eba_sem);
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if (err && pnum >= 0)
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err = ubi_wl_put_peb(ubi, vol_id, lnum, pnum, 1);
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else if (!err && opnum >= 0)
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err = ubi_wl_put_peb(ubi, vol_id, lnum, opnum, 0);
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return err;
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}
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/**
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* ubi_eba_write_leb - write data to dynamic volume.
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* @ubi: UBI device description object
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@ -705,11 +768,12 @@ static int recover_peb(struct ubi_device *ubi, int pnum, int vol_id, int lnum,
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* @vol. Returns zero in case of success and a negative error code in case
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* of failure. In case of error, it is possible that something was still
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* written to the flash media, but may be some garbage.
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* This function retries %UBI_IO_RETRIES times before giving up.
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*/
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int ubi_eba_write_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum,
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const void *buf, int offset, int len)
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{
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int err, pnum, tries = 0, vol_id = vol->vol_id;
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int err, pnum, tries, vol_id = vol->vol_id;
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struct ubi_vid_hdr *vid_hdr;
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if (ubi->ro_mode)
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@ -730,11 +794,9 @@ int ubi_eba_write_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum,
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if (err == -EIO && ubi->bad_allowed)
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err = recover_peb(ubi, pnum, vol_id, lnum, buf,
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offset, len);
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if (err)
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ubi_ro_mode(ubi);
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}
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leb_write_unlock(ubi, vol_id, lnum);
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return err;
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goto out;
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}
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/*
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@ -754,67 +816,31 @@ int ubi_eba_write_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum,
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vid_hdr->compat = ubi_get_compat(ubi, vol_id);
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vid_hdr->data_pad = cpu_to_be32(vol->data_pad);
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retry:
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pnum = ubi_wl_get_peb(ubi);
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if (pnum < 0) {
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ubi_free_vid_hdr(ubi, vid_hdr);
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leb_write_unlock(ubi, vol_id, lnum);
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up_read(&ubi->fm_eba_sem);
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return pnum;
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for (tries = 0; tries <= UBI_IO_RETRIES; tries++) {
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err = try_write_vid_and_data(vol, lnum, vid_hdr, buf, offset,
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len);
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if (err != -EIO || !ubi->bad_allowed)
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break;
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/*
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* Fortunately, this is the first write operation to this
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* physical eraseblock, so just put it and request a new one.
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* We assume that if this physical eraseblock went bad, the
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* erase code will handle that.
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*/
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vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
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ubi_msg(ubi, "try another PEB");
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}
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dbg_eba("write VID hdr and %d bytes at offset %d of LEB %d:%d, PEB %d",
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len, offset, vol_id, lnum, pnum);
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ubi_free_vid_hdr(ubi, vid_hdr);
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err = ubi_io_write_vid_hdr(ubi, pnum, vid_hdr);
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if (err) {
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ubi_warn(ubi, "failed to write VID header to LEB %d:%d, PEB %d",
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vol_id, lnum, pnum);
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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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if (len) {
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err = ubi_io_write_data(ubi, buf, pnum, offset, len);
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if (err) {
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ubi_warn(ubi, "failed to write %d bytes at offset %d of LEB %d:%d, PEB %d",
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len, offset, vol_id, lnum, pnum);
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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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}
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vol->eba_tbl[lnum] = pnum;
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up_read(&ubi->fm_eba_sem);
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out:
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if (err)
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ubi_ro_mode(ubi);
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leb_write_unlock(ubi, vol_id, lnum);
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ubi_free_vid_hdr(ubi, vid_hdr);
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return 0;
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write_error:
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if (err != -EIO || !ubi->bad_allowed) {
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ubi_ro_mode(ubi);
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leb_write_unlock(ubi, vol_id, lnum);
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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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/*
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* Fortunately, this is the first write operation to this physical
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* eraseblock, so just put it and request a new one. We assume that if
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* this physical eraseblock went bad, the erase code will handle that.
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*/
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err = ubi_wl_put_peb(ubi, vol_id, lnum, pnum, 1);
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if (err || ++tries > UBI_IO_RETRIES) {
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ubi_ro_mode(ubi);
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leb_write_unlock(ubi, vol_id, lnum);
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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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vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
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ubi_msg(ubi, "try another PEB");
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goto retry;
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return err;
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}
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/**
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@ -842,7 +868,7 @@ write_error:
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int ubi_eba_write_leb_st(struct ubi_device *ubi, struct ubi_volume *vol,
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int lnum, const void *buf, int len, int used_ebs)
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{
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int err, pnum, tries = 0, data_size = len, vol_id = vol->vol_id;
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int err, tries, data_size = len, vol_id = vol->vol_id;
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struct ubi_vid_hdr *vid_hdr;
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uint32_t crc;
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@ -860,10 +886,8 @@ int ubi_eba_write_leb_st(struct ubi_device *ubi, struct ubi_volume *vol,
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return -ENOMEM;
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err = leb_write_lock(ubi, vol_id, lnum);
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if (err) {
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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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if (err)
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goto out;
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vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
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vid_hdr->vol_id = cpu_to_be32(vol_id);
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@ -877,66 +901,26 @@ int ubi_eba_write_leb_st(struct ubi_device *ubi, struct ubi_volume *vol,
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vid_hdr->used_ebs = cpu_to_be32(used_ebs);
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vid_hdr->data_crc = cpu_to_be32(crc);
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retry:
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pnum = ubi_wl_get_peb(ubi);
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if (pnum < 0) {
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ubi_free_vid_hdr(ubi, vid_hdr);
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leb_write_unlock(ubi, vol_id, lnum);
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up_read(&ubi->fm_eba_sem);
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return pnum;
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}
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dbg_eba("write VID hdr and %d bytes at LEB %d:%d, PEB %d, used_ebs %d",
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len, vol_id, lnum, pnum, used_ebs);
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err = ubi_io_write_vid_hdr(ubi, pnum, vid_hdr);
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if (err) {
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ubi_warn(ubi, "failed to write VID header to LEB %d:%d, PEB %d",
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vol_id, lnum, pnum);
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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, buf, pnum, 0, len);
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if (err) {
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ubi_warn(ubi, "failed to write %d bytes of data to PEB %d",
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len, pnum);
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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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ubi_assert(vol->eba_tbl[lnum] < 0);
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vol->eba_tbl[lnum] = pnum;
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up_read(&ubi->fm_eba_sem);
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for (tries = 0; tries <= UBI_IO_RETRIES; tries++) {
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err = try_write_vid_and_data(vol, lnum, vid_hdr, buf, 0, len);
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if (err != -EIO || !ubi->bad_allowed)
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break;
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vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
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ubi_msg(ubi, "try another PEB");
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}
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if (err)
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ubi_ro_mode(ubi);
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leb_write_unlock(ubi, vol_id, lnum);
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out:
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ubi_free_vid_hdr(ubi, vid_hdr);
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return 0;
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write_error:
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if (err != -EIO || !ubi->bad_allowed) {
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/*
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* This flash device does not admit of bad eraseblocks or
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* something nasty and unexpected happened. Switch to read-only
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* mode just in case.
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*/
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ubi_ro_mode(ubi);
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leb_write_unlock(ubi, vol_id, lnum);
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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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err = ubi_wl_put_peb(ubi, vol_id, lnum, pnum, 1);
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if (err || ++tries > UBI_IO_RETRIES) {
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ubi_ro_mode(ubi);
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leb_write_unlock(ubi, vol_id, lnum);
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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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vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
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ubi_msg(ubi, "try another PEB");
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goto retry;
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return err;
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}
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/*
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@ -959,7 +943,7 @@ write_error:
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int ubi_eba_atomic_leb_change(struct ubi_device *ubi, struct ubi_volume *vol,
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int lnum, const void *buf, int len)
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{
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int err, pnum, old_pnum, tries = 0, vol_id = vol->vol_id;
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int err, tries, vol_id = vol->vol_id;
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struct ubi_vid_hdr *vid_hdr;
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uint32_t crc;
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@ -998,70 +982,31 @@ int ubi_eba_atomic_leb_change(struct ubi_device *ubi, struct ubi_volume *vol,
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vid_hdr->copy_flag = 1;
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vid_hdr->data_crc = cpu_to_be32(crc);
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retry:
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pnum = ubi_wl_get_peb(ubi);
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if (pnum < 0) {
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err = pnum;
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up_read(&ubi->fm_eba_sem);
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goto out_leb_unlock;
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dbg_eba("change LEB %d:%d", vol_id, lnum);
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for (tries = 0; tries <= UBI_IO_RETRIES; tries++) {
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err = try_write_vid_and_data(vol, lnum, vid_hdr, buf, 0, len);
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if (err != -EIO || !ubi->bad_allowed)
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break;
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vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
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ubi_msg(ubi, "try another PEB");
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}
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dbg_eba("change LEB %d:%d, PEB %d, write VID hdr to PEB %d",
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vol_id, lnum, vol->eba_tbl[lnum], pnum);
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/*
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* This flash device does not admit of bad eraseblocks or
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* something nasty and unexpected happened. Switch to read-only
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* mode just in case.
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*/
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if (err)
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ubi_ro_mode(ubi);
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err = ubi_io_write_vid_hdr(ubi, pnum, vid_hdr);
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if (err) {
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ubi_warn(ubi, "failed to write VID header to LEB %d:%d, PEB %d",
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vol_id, lnum, pnum);
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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, buf, pnum, 0, len);
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if (err) {
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ubi_warn(ubi, "failed to write %d bytes of data to PEB %d",
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len, pnum);
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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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old_pnum = vol->eba_tbl[lnum];
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vol->eba_tbl[lnum] = pnum;
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up_read(&ubi->fm_eba_sem);
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if (old_pnum >= 0) {
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err = ubi_wl_put_peb(ubi, vol_id, lnum, old_pnum, 0);
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if (err)
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goto out_leb_unlock;
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}
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out_leb_unlock:
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leb_write_unlock(ubi, vol_id, lnum);
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out_mutex:
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mutex_unlock(&ubi->alc_mutex);
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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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if (err != -EIO || !ubi->bad_allowed) {
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/*
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* This flash device does not admit of bad eraseblocks or
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* something nasty and unexpected happened. Switch to read-only
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* mode just in case.
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*/
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ubi_ro_mode(ubi);
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goto out_leb_unlock;
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}
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err = ubi_wl_put_peb(ubi, vol_id, lnum, pnum, 1);
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if (err || ++tries > UBI_IO_RETRIES) {
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ubi_ro_mode(ubi);
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goto out_leb_unlock;
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}
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vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
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ubi_msg(ubi, "try another PEB");
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goto retry;
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}
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/**
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