diff options
Diffstat (limited to 'drivers/mtd/ubi/kapi.c')
| -rw-r--r-- | drivers/mtd/ubi/kapi.c | 110 |
1 files changed, 93 insertions, 17 deletions
diff --git a/drivers/mtd/ubi/kapi.c b/drivers/mtd/ubi/kapi.c index f3bab669f6b..478e00cf2d9 100644 --- a/drivers/mtd/ubi/kapi.c +++ b/drivers/mtd/ubi/kapi.c @@ -137,7 +137,7 @@ struct ubi_volume_desc *ubi_open_volume(int ubi_num, int vol_id, int mode) return ERR_PTR(-EINVAL); if (mode != UBI_READONLY && mode != UBI_READWRITE && - mode != UBI_EXCLUSIVE) + mode != UBI_EXCLUSIVE && mode != UBI_METAONLY) return ERR_PTR(-EINVAL); /* @@ -182,10 +182,17 @@ struct ubi_volume_desc *ubi_open_volume(int ubi_num, int vol_id, int mode) break; case UBI_EXCLUSIVE: - if (vol->exclusive || vol->writers || vol->readers) + if (vol->exclusive || vol->writers || vol->readers || + vol->metaonly) goto out_unlock; vol->exclusive = 1; break; + + case UBI_METAONLY: + if (vol->metaonly || vol->exclusive) + goto out_unlock; + vol->metaonly = 1; + break; } get_device(&vol->dev); vol->ref_count += 1; @@ -343,6 +350,10 @@ void ubi_close_volume(struct ubi_volume_desc *desc) break; case UBI_EXCLUSIVE: vol->exclusive = 0; + break; + case UBI_METAONLY: + vol->metaonly = 0; + break; } vol->ref_count -= 1; spin_unlock(&ubi->volumes_lock); @@ -355,6 +366,43 @@ void ubi_close_volume(struct ubi_volume_desc *desc) EXPORT_SYMBOL_GPL(ubi_close_volume); /** + * leb_read_sanity_check - does sanity checks on read requests. + * @desc: volume descriptor + * @lnum: logical eraseblock number to read from + * @offset: offset within the logical eraseblock to read from + * @len: how many bytes to read + * + * This function is used by ubi_leb_read() and ubi_leb_read_sg() + * to perform sanity checks. + */ +static int leb_read_sanity_check(struct ubi_volume_desc *desc, int lnum, + int offset, int len) +{ + struct ubi_volume *vol = desc->vol; + struct ubi_device *ubi = vol->ubi; + int vol_id = vol->vol_id; + + if (vol_id < 0 || vol_id >= ubi->vtbl_slots || lnum < 0 || + lnum >= vol->used_ebs || offset < 0 || len < 0 || + offset + len > vol->usable_leb_size) + return -EINVAL; + + if (vol->vol_type == UBI_STATIC_VOLUME) { + if (vol->used_ebs == 0) + /* Empty static UBI volume */ + return 0; + if (lnum == vol->used_ebs - 1 && + offset + len > vol->last_eb_bytes) + return -EINVAL; + } + + if (vol->upd_marker) + return -EBADF; + + return 0; +} + +/** * ubi_leb_read - read data. * @desc: volume descriptor * @lnum: logical eraseblock number to read from @@ -390,22 +438,10 @@ int ubi_leb_read(struct ubi_volume_desc *desc, int lnum, char *buf, int offset, dbg_gen("read %d bytes from LEB %d:%d:%d", len, vol_id, lnum, offset); - if (vol_id < 0 || vol_id >= ubi->vtbl_slots || lnum < 0 || - lnum >= vol->used_ebs || offset < 0 || len < 0 || - offset + len > vol->usable_leb_size) - return -EINVAL; - - if (vol->vol_type == UBI_STATIC_VOLUME) { - if (vol->used_ebs == 0) - /* Empty static UBI volume */ - return 0; - if (lnum == vol->used_ebs - 1 && - offset + len > vol->last_eb_bytes) - return -EINVAL; - } + err = leb_read_sanity_check(desc, lnum, offset, len); + if (err < 0) + return err; - if (vol->upd_marker) - return -EBADF; if (len == 0) return 0; @@ -419,6 +455,46 @@ int ubi_leb_read(struct ubi_volume_desc *desc, int lnum, char *buf, int offset, } EXPORT_SYMBOL_GPL(ubi_leb_read); + +/** + * ubi_leb_read_sg - read data into a scatter gather list. + * @desc: volume descriptor + * @lnum: logical eraseblock number to read from + * @buf: buffer where to store the read data + * @offset: offset within the logical eraseblock to read from + * @len: how many bytes to read + * @check: whether UBI has to check the read data's CRC or not. + * + * This function works exactly like ubi_leb_read_sg(). But instead of + * storing the read data into a buffer it writes to an UBI scatter gather + * list. + */ +int ubi_leb_read_sg(struct ubi_volume_desc *desc, int lnum, struct ubi_sgl *sgl, + int offset, int len, int check) +{ + struct ubi_volume *vol = desc->vol; + struct ubi_device *ubi = vol->ubi; + int err, vol_id = vol->vol_id; + + dbg_gen("read %d bytes from LEB %d:%d:%d", len, vol_id, lnum, offset); + + err = leb_read_sanity_check(desc, lnum, offset, len); + if (err < 0) + return err; + + if (len == 0) + return 0; + + err = ubi_eba_read_leb_sg(ubi, vol, sgl, lnum, offset, len, check); + if (err && mtd_is_eccerr(err) && vol->vol_type == UBI_STATIC_VOLUME) { + ubi_warn(ubi, "mark volume %d as corrupted", vol_id); + vol->corrupted = 1; + } + + return err; +} +EXPORT_SYMBOL_GPL(ubi_leb_read_sg); + /** * ubi_leb_write - write data. * @desc: volume descriptor |