diff options
| -rw-r--r-- | drivers/mtd/ubi/wl.c | 9 | ||||
| -rw-r--r-- | fs/ubifs/super.c | 5 | ||||
| -rw-r--r-- | include/mtd/ubi-user.h | 11 |
3 files changed, 14 insertions, 11 deletions
diff --git a/drivers/mtd/ubi/wl.c b/drivers/mtd/ubi/wl.c index f0bc107..64ce993 100644 --- a/drivers/mtd/ubi/wl.c +++ b/drivers/mtd/ubi/wl.c @@ -41,12 +41,6 @@ * physical eraseblocks with low erase counter to free physical eraseblocks * with high erase counter. * - * The 'ubi_wl_get_peb()' function accepts data type hints which help to pick - * an "optimal" physical eraseblock. For example, when it is known that the - * physical eraseblock will be "put" soon because it contains short-term data, - * the WL sub-system may pick a free physical eraseblock with low erase - * counter, and so forth. - * * If the WL sub-system fails to erase a physical eraseblock, it marks it as * bad. * @@ -70,8 +64,7 @@ * to the user; instead, we first want to let users fill them up with data; * * o there is a chance that the user will put the physical eraseblock very - * soon, so it makes sense not to move it for some time, but wait; this is - * especially important in case of "short term" physical eraseblocks. + * soon, so it makes sense not to move it for some time, but wait. * * Physical eraseblocks stay protected only for limited time. But the "time" is * measured in erase cycles in this case. This is implemented with help of the diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c index d7cbf7a..001accc 100644 --- a/fs/ubifs/super.c +++ b/fs/ubifs/super.c @@ -814,9 +814,8 @@ static int alloc_wbufs(struct ubifs_info *c) } /* - * Garbage Collector head likely contains long-term data and - * does not need to be synchronized by timer. Also GC head nodes are - * not grouped. + * Garbage Collector head does not need to be synchronized by timer. + * Also GC head nodes are not grouped. */ c->jheads[GCHD].wbuf.no_timer = 1; c->jheads[GCHD].grouped = 0; diff --git a/include/mtd/ubi-user.h b/include/mtd/ubi-user.h index 370c750..8787349 100644 --- a/include/mtd/ubi-user.h +++ b/include/mtd/ubi-user.h @@ -358,7 +358,17 @@ struct ubi_rnvol_req { * requests. * @lnum: logical eraseblock number to change * @bytes: how many bytes will be written to the logical eraseblock + * @dtype: pass "3" for better compatibility with old kernels * @padding: reserved for future, not used, has to be zeroed + * + * The @dtype field used to inform UBI about what kind of data will be written + * to the LEB: long term (value 1), short term (value 2), unknown (value 3). + * UBI tried to pick a PEB with lower erase counter for short term data and a + * PEB with higher erase counter for long term data. But this was not really + * used because users usually do not know this and could easily mislead UBI. We + * removed this feature in May 2012. UBI currently just ignores the @dtype + * field. But for better compatibility with older kernels it is recommended to + * set @dtype to 3 (unknown). */ struct ubi_leb_change_req { __s32 lnum; @@ -369,6 +379,7 @@ struct ubi_leb_change_req { /** * struct ubi_map_req - a data structure used in map LEB requests. + * @dtype: pass "3" for better compatibility with old kernels * @lnum: logical eraseblock number to unmap * @padding: reserved for future, not used, has to be zeroed */ |
