UBI: Fastmap: Locking updates
a) Rename ubi->fm_sem to ubi->fm_eba_sem as this semaphore
protects EBA changes.
b) Turn ubi->fm_mutex into a rw semaphore. It will still serialize
fastmap writes but also ensures that ubi_wl_put_peb() is not
interrupted by a fastmap write. We use a rw semaphore to allow
ubi_wl_put_peb() still to be executed in parallel if no fastmap
write is happening.
Signed-off-by: Richard Weinberger <richard@nod.at>
diff --git a/drivers/mtd/ubi/eba.c b/drivers/mtd/ubi/eba.c
index 4757cef..51bca03 100644
--- a/drivers/mtd/ubi/eba.c
+++ b/drivers/mtd/ubi/eba.c
@@ -340,9 +340,9 @@
dbg_eba("erase LEB %d:%d, PEB %d", vol_id, lnum, pnum);
- down_read(&ubi->fm_sem);
+ down_read(&ubi->fm_eba_sem);
vol->eba_tbl[lnum] = UBI_LEB_UNMAPPED;
- up_read(&ubi->fm_sem);
+ up_read(&ubi->fm_eba_sem);
err = ubi_wl_put_peb(ubi, vol_id, lnum, pnum, 0);
out_unlock:
@@ -567,7 +567,7 @@
new_pnum = ubi_wl_get_peb(ubi);
if (new_pnum < 0) {
ubi_free_vid_hdr(ubi, vid_hdr);
- up_read(&ubi->fm_sem);
+ up_read(&ubi->fm_eba_sem);
return new_pnum;
}
@@ -578,14 +578,14 @@
if (err && err != UBI_IO_BITFLIPS) {
if (err > 0)
err = -EIO;
- up_read(&ubi->fm_sem);
+ up_read(&ubi->fm_eba_sem);
goto out_put;
}
vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
err = ubi_io_write_vid_hdr(ubi, new_pnum, vid_hdr);
if (err) {
- up_read(&ubi->fm_sem);
+ up_read(&ubi->fm_eba_sem);
goto write_error;
}
@@ -597,7 +597,7 @@
if (offset > 0) {
err = ubi_io_read_data(ubi, ubi->peb_buf, pnum, 0, offset);
if (err && err != UBI_IO_BITFLIPS) {
- up_read(&ubi->fm_sem);
+ up_read(&ubi->fm_eba_sem);
goto out_unlock;
}
}
@@ -607,7 +607,7 @@
err = ubi_io_write_data(ubi, ubi->peb_buf, new_pnum, 0, data_size);
if (err) {
mutex_unlock(&ubi->buf_mutex);
- up_read(&ubi->fm_sem);
+ up_read(&ubi->fm_eba_sem);
goto write_error;
}
@@ -615,7 +615,7 @@
ubi_free_vid_hdr(ubi, vid_hdr);
vol->eba_tbl[lnum] = new_pnum;
- up_read(&ubi->fm_sem);
+ up_read(&ubi->fm_eba_sem);
ubi_wl_put_peb(ubi, vol_id, lnum, pnum, 1);
ubi_msg(ubi, "data was successfully recovered");
@@ -710,7 +710,7 @@
if (pnum < 0) {
ubi_free_vid_hdr(ubi, vid_hdr);
leb_write_unlock(ubi, vol_id, lnum);
- up_read(&ubi->fm_sem);
+ up_read(&ubi->fm_eba_sem);
return pnum;
}
@@ -721,7 +721,7 @@
if (err) {
ubi_warn(ubi, "failed to write VID header to LEB %d:%d, PEB %d",
vol_id, lnum, pnum);
- up_read(&ubi->fm_sem);
+ up_read(&ubi->fm_eba_sem);
goto write_error;
}
@@ -730,13 +730,13 @@
if (err) {
ubi_warn(ubi, "failed to write %d bytes at offset %d of LEB %d:%d, PEB %d",
len, offset, vol_id, lnum, pnum);
- up_read(&ubi->fm_sem);
+ up_read(&ubi->fm_eba_sem);
goto write_error;
}
}
vol->eba_tbl[lnum] = pnum;
- up_read(&ubi->fm_sem);
+ up_read(&ubi->fm_eba_sem);
leb_write_unlock(ubi, vol_id, lnum);
ubi_free_vid_hdr(ubi, vid_hdr);
@@ -833,7 +833,7 @@
if (pnum < 0) {
ubi_free_vid_hdr(ubi, vid_hdr);
leb_write_unlock(ubi, vol_id, lnum);
- up_read(&ubi->fm_sem);
+ up_read(&ubi->fm_eba_sem);
return pnum;
}
@@ -844,7 +844,7 @@
if (err) {
ubi_warn(ubi, "failed to write VID header to LEB %d:%d, PEB %d",
vol_id, lnum, pnum);
- up_read(&ubi->fm_sem);
+ up_read(&ubi->fm_eba_sem);
goto write_error;
}
@@ -852,13 +852,13 @@
if (err) {
ubi_warn(ubi, "failed to write %d bytes of data to PEB %d",
len, pnum);
- up_read(&ubi->fm_sem);
+ up_read(&ubi->fm_eba_sem);
goto write_error;
}
ubi_assert(vol->eba_tbl[lnum] < 0);
vol->eba_tbl[lnum] = pnum;
- up_read(&ubi->fm_sem);
+ up_read(&ubi->fm_eba_sem);
leb_write_unlock(ubi, vol_id, lnum);
ubi_free_vid_hdr(ubi, vid_hdr);
@@ -953,7 +953,7 @@
pnum = ubi_wl_get_peb(ubi);
if (pnum < 0) {
err = pnum;
- up_read(&ubi->fm_sem);
+ up_read(&ubi->fm_eba_sem);
goto out_leb_unlock;
}
@@ -964,7 +964,7 @@
if (err) {
ubi_warn(ubi, "failed to write VID header to LEB %d:%d, PEB %d",
vol_id, lnum, pnum);
- up_read(&ubi->fm_sem);
+ up_read(&ubi->fm_eba_sem);
goto write_error;
}
@@ -972,13 +972,13 @@
if (err) {
ubi_warn(ubi, "failed to write %d bytes of data to PEB %d",
len, pnum);
- up_read(&ubi->fm_sem);
+ up_read(&ubi->fm_eba_sem);
goto write_error;
}
old_pnum = vol->eba_tbl[lnum];
vol->eba_tbl[lnum] = pnum;
- up_read(&ubi->fm_sem);
+ up_read(&ubi->fm_eba_sem);
if (old_pnum >= 0) {
err = ubi_wl_put_peb(ubi, vol_id, lnum, old_pnum, 0);
@@ -1231,9 +1231,9 @@
}
ubi_assert(vol->eba_tbl[lnum] == from);
- down_read(&ubi->fm_sem);
+ down_read(&ubi->fm_eba_sem);
vol->eba_tbl[lnum] = to;
- up_read(&ubi->fm_sem);
+ up_read(&ubi->fm_eba_sem);
out_unlock_buf:
mutex_unlock(&ubi->buf_mutex);