From 6fa6f5bbc3a2ad833a3d4b798140602004f70f5a Mon Sep 17 00:00:00 2001 From: Artem Bityutskiy Date: Fri, 5 Dec 2008 13:37:02 +0200 Subject: UBI: handle write errors in WL worker When a PEB is moved and a write error happens, UBI switches to R/O mode, which is wrong, because we just copy the data and may select a different PEB and re-try this. This patch fixes WL worker's behavior. Signed-off-by: Artem Bityutskiy --- drivers/mtd/ubi/eba.c | 37 ++++++++++++++++++++++++------------- 1 file changed, 24 insertions(+), 13 deletions(-) (limited to 'drivers/mtd/ubi/eba.c') diff --git a/drivers/mtd/ubi/eba.c b/drivers/mtd/ubi/eba.c index 2e4d6bf9458..048a606cebd 100644 --- a/drivers/mtd/ubi/eba.c +++ b/drivers/mtd/ubi/eba.c @@ -949,10 +949,14 @@ write_error: * 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 %1 if the operation was canceled and should be tried later (e.g., - * because a bit-flip was detected at the target PEB); - * o %2 if the volume is being deleted and this LEB should not be moved. + * o %0 in case of success; + * o %1 if the operation was canceled because the volume is being deleted + * or because the PEB was put meanwhile; + * o %2 if the operation was canceled because there was a write error to the + * target PEB; + * o %-EAGAIN if the operation was canceled because a bit-flip was detected + * in the target PEB; + * 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) @@ -978,7 +982,7 @@ int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to, /* * 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 unmaps all the volume's logical eraseblocks, it will + * 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]; @@ -986,7 +990,7 @@ int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to, /* No need to do further work, cancel */ dbg_eba("volume %d is being removed, cancel", vol_id); spin_unlock(&ubi->volumes_lock); - return 2; + return 1; } spin_unlock(&ubi->volumes_lock); @@ -1023,7 +1027,7 @@ int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to, /* * OK, now the LEB is locked and we can safely start moving it. Since - * this function utilizes thie @ubi->peb1_buf buffer which is shared + * this function utilizes the @ubi->peb1_buf buffer which is shared * with some other functions, so lock the buffer by taking the * @ubi->buf_mutex. */ @@ -1068,8 +1072,11 @@ int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to, vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); err = ubi_io_write_vid_hdr(ubi, to, vid_hdr); - if (err) + if (err) { + if (err == -EIO) + err = 2; goto out_unlock_buf; + } cond_resched(); @@ -1079,14 +1086,17 @@ int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to, if (err != UBI_IO_BITFLIPS) ubi_warn("cannot read VID header back from PEB %d", to); else - err = 1; + err = -EAGAIN; goto out_unlock_buf; } if (data_size > 0) { err = ubi_io_write_data(ubi, ubi->peb_buf1, to, 0, aldata_size); - if (err) + if (err) { + if (err == -EIO) + err = 2; goto out_unlock_buf; + } cond_resched(); @@ -1101,15 +1111,16 @@ int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to, ubi_warn("cannot read data back from PEB %d", to); else - err = 1; + err = -EAGAIN; goto out_unlock_buf; } cond_resched(); if (memcmp(ubi->peb_buf1, ubi->peb_buf2, aldata_size)) { - ubi_warn("read data back from PEB %d - it is different", - to); + ubi_warn("read data back from PEB %d and it is " + "different", to); + err = -EINVAL; goto out_unlock_buf; } } -- cgit v1.2.3-70-g09d2