mtd-utils.git/lib, branch v1.5.0

libmtd_legacy: don't open device in R/W

2012-02-29T07:19:17+00:00

On legacy kernels with ROM devices, we can get mtdinfo errors like: libmtd: error!: cannot open "/dev/mtd4" error 13 (Permission denied) mtdinfo: error!: libmtd failed get MTD device 4 information error 13 (Permission denied) We don't need O_RDRW access for informational ioctls(), so make this O_RDONLY. Signed-off-by: Brian Norris Signed-off-by: Artem Bityutskiy

libmtd: perform device checking first

2012-02-29T07:19:17+00:00

If we don't check for the MTD before calling `legacy_get_dev_info1', we may get errors like: libmtd: MTD subsystem is old and does not support sysfs, so MTD character device nodes have to exist libmtd: error!: "/dev/mtd2" is not a character device mtdinfo: error!: libmtd failed get MTD device 2 information error 22 (Invalid argument) So reverse the order of these two checks. Signed-off-by: Brian Norris Signed-off-by: Artem Bityutskiy

libmtd: fix mtd_write() issues for large data-only writes

2012-02-14T09:01:20+00:00

ioctl(MEMWRITE) is implemented with memdup_user(), and so it allocates kernel memory in contiguous regions. This limits its usefulness for large amounts of data, since contiguous kernel memory can become scarce. I have experienced "out of memory" problems with ubiformat, for instance, which writes in eraseblock-sized regions: ... ubiformat: flashing eraseblock 12 -- 72 % complete ubiformat: page allocation failure. order:8, mode:0xd0 Call Trace: [<8043fa7c>] dump_stack+0x8/0x34 [<8008c940>] __alloc_pages_nodemask+0x408/0x618 [<800bd748>] cache_alloc_refill+0x400/0x730 [<800bdbbc>] __kmalloc+0x144/0x154 [<8009cae4>] memdup_user+0x24/0x94 [<802d04e4>] mtd_ioctl+0xba8/0xbd0 [<802d0544>] mtd_unlocked_ioctl+0x38/0x5c [<800d43c0>] do_vfs_ioctl+0xa4/0x6e4 [<800d4a44>] sys_ioctl+0x44/0xa0 [<8000f95c>] stack_done+0x20/0x40 ... libmtd: error!: MEMWRITE ioctl failed for eraseblock 12 (mtd0) error 12 (Cannot allocate memory) ubiformat: error!: cannot write eraseblock 12 error 12 (Cannot allocate memory) This error can be mitigated for now by only using ioctl(MEMWRITE) when we need to write OOB data, since we can only do this in small transactions anyway. Then, data-only transactions (like those originating from ubiformat) can be carried out with write() calls. This issue can also be solved within the kernel ioctl(), but either way, this patch is still useful, since write() is more straightforward (and efficient?) than ioctl() for data-only writes. Signed-off-by: Brian Norris Signed-off-by: Artem Bityutskiy

libmtd: fix segmentation fault on lib->mtd

2012-02-14T09:00:12+00:00

Legacy systems do not initialize lib->mtd, so we shouldn't perform strlen(lib->mtd); this produces a segmentation fault. As this code isn't used in the legacy codepath, we can just move it down to an 'else' branch. Signed-off-by: Brian Norris Signed-off-by: Artem Bityutskiy

limbtd: implement mtd_dev_present for old kernels

2012-02-14T09:00:09+00:00

Implement the 'legacy_dev_present()' function which will check whether an MTD device is present by scanning the /proc/mtd file when the MTD subsystem does not support sysfs (the case for pre-2.6.30 kernels). This patch also moves the 'mtd_dev_present()' function to a slightly more logical position. Signed-off-by: Artem Bityutskiy

libmtd: add `mtd_dev_present()' library function

2012-02-02T11:23:39+00:00

Will be used for `mtdinfo --all' Artem: add a temporary stub for pre-2.6.30 kernels. Signed-off-by: Brian Norris Signed-off-by: Artem Bityutskiy

libmtd: Variable name same as function name causing compile to fail (Android)

2012-01-13T21:56:56+00:00

When compiling mtd-utils against Android's bionic libc using the supplied cross compiler environment it errors: lib/libmtd.c: In function 'dev_node2num': lib/libmtd.c:444: error: called object 'major' is not a function lib/libmtd.c:445: error: called object 'minor' is not a function lib/libmtd.c: In function 'mtd_probe_node': lib/libmtd.c:1384: error: called object 'major' is not a function lib/libmtd.c:1385: error: called object 'minor' is not a function This patch updates the variable names for "major" and "minor" in two places. It then compiles cleanly. Artem: pick different names, also rename major1/minor1 variables for consistency. Signed-off-by: Thomas Cannon Cc: linux-mtd at lists.infradead.org

libmtd: allow write operations when MEMWRITE is not supported

2011-12-12T21:45:54+00:00

MEMWRITE is a recently introduced write interface for MTD; however, it is only supported on NAND flash. mtd-utils should fall back to old write methods when either ENOTTY or EOPNOTSUPP are returned. This is a showstopper when, for instance, using ubiformat on NOR, which don't have a mtd->write_oob interface (and thus don't support MEMWRITE): ubiformat: formatting eraseblock 2 -- 1 % complete libmtd: error!: MEMWRITE ioctl failed for eraseblock 2 (mtd3) error 122 (Operation not supported) Signed-off-by: Brian Norris Signed-off-by: Artem Bityutskiy

mtdutils: move OOB auto-layout into libmtd's mtd_write

2011-09-11T13:11:41+00:00

With the addition of the the new ioctl(MEMWRITE), we can use the kernel's internal OOB autoplacement option. It's a cleaner interface and avoids too much duplication of coding effort. This patch moves any legacy code (using MEMGETOOBSEL) into a legacy function in libmtd.c. It's not exactly a "pre-2.6.30" feature, so I'm not moving it to libmtd_legacy.c. Now, autoplacement features are only activated if we call mtd_write with mode == MTD_OPS_AUTO_OOB. This should fix some discrepancies for nandwrite, where we weren't handling OOB consistently (i.e., we had different functionality when the kernel did/didn't support MEMWRITE). But that also means that we now default to using MTD_OPS_PLACE_OOB instead of AUTO layout. To re-enable autoplacement, we can re-implement the `--autoplace' option that had previously rotted. This patch also cleans up a need for an extra OOB buffer in nandwrite. This has been tested a little in nandsim as well as on SLC NAND flash. Signed-off-by: Brian Norris Signed-off-by: Artem Bityutskiy

libmtd: support MEMWRITE ioctl

2011-09-11T13:11:41+00:00

`mtd_write()' now will first attempt to use MEMWRITE. Then, if that doesn't exist, it will attempt to fall back to old methods for writing OOB and/or page data. Signed-off-by: Brian Norris Signed-off-by: Artem Bityutskiy