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2012-02-14libmtd: fix mtd_write() issues for large data-only writesBrian Norris
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 <computersforpeace@gmail.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
2012-02-14libmtd: fix segmentation fault on lib->mtdBrian Norris
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 <computersforpeace@gmail.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
2012-02-14limbtd: implement mtd_dev_present for old kernelsArtem Bityutskiy
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 <artem.bityutskiy@linux.intel.com>
2012-02-02libmtd: add `mtd_dev_present()' library functionBrian Norris
Will be used for `mtdinfo --all' Artem: add a temporary stub for pre-2.6.30 kernels. Signed-off-by: Brian Norris <computersforpeace@gmail.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
2012-01-13libmtd: Variable name same as function name causing compile to fail (Android)Thomas Cannon
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 <mail at thomascannon.net> Cc: linux-mtd at lists.infradead.org
2011-12-12libmtd: allow write operations when MEMWRITE is not supportedBrian Norris
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 <computersforpeace@gmail.com> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@linux.intel.com>
2011-09-11mtdutils: move OOB auto-layout into libmtd's mtd_writeBrian Norris
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 <computersforpeace@gmail.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@intel.com>
2011-09-11libmtd: support MEMWRITE ioctlBrian Norris
`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 <computersforpeace@gmail.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@intel.com>
2011-09-11libmtd: modify `mtd_write' to cover OOB writesBrian Norris
To support the MEMWRITE ioctl, we will need a different sort of libmtd interface for writing to flash. We will expand mtd_write to include more functionality; for now, we just change the function definition and description as we begin to add the actual functionality. Signed-off-by: Brian Norris <computersforpeace@gmail.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@intel.com>
2011-06-08libmtd: improve mtd_islocked interfaceArtem Bityutskiy
This patch first of all, re-names 'mtd_islocked()' into 'mtd_is_locked()' since this seems to be the name Mike wanted, and it looks a bit nicer. This patch also makes 'mtd_is_locked()' print an error message if it fails. I'm not sure if it is good idea for a library to do so, but all functions do this, so it certainly _not_ a good idea to be inconsistent. However, for the special case, when the the "is locked" ioctl is not supported or is not valid for this device, we do not print an error message and return ENOTSUPP error code. Thus, the user can distinguish between real errors and non-fatal "not supported" cases. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-06-08libmtd: add helper funcs for getting regioninfo and locked infoMike Frysinger
This extends the libmtd with the helper functions: mtd_regioninfo: interface to MEMGETREGIONINFO mtd_islocked: interface to MEMISLOCKED Users of these functions will follow shortly ... Artem: do not print error message in mtd_islocked() Signed-off-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-06-07libmtd: use O_CLOEXECMike Frysinger
Not strictly necessary, but this is good library behavior and should carry no runtime overhead. Signed-off-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-04-21libmtd: use PRIu64 classifier for uint64_t printf argumentsAndy Shevchenko
Signed-off-by: Andy Shevchenko <ext-andriy.shevchenko@nokia.com> Acked-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-04-01libmtd: fix OOB read and write interfacev1.4.4Artem Bityutskiy
When reading and writing OOB we specify the address as absolute offset from the beginning of the MTD device. This offset is basically an absolute page offset plus the OOB offset. And it does not have to be aligned to the min. I/O unit size (NAND page size). So fix the 'do_oob_op()' function and remove incorrect checking that the offset is page-aligned. This check leads to the following errors: libmtd: error!: unaligned address 2, mtd0 page size is 2048 But obviously, the intent was to write to offset 2 of the OOB area of the very first NAND page. Instead of that incorrect check, we should check that the OOB offset we write to is within the OOB size and the length is withing the OOB size. This patch adds such check. Reported-by: Kelly Anderson <kelly@silka.with-linux.com> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com> Tested-by: Kelly Anderson <kelly@silka.with-linux.com>
2010-10-02libmtd: make malloc failures fatalMike Frysinger
This converts libmtd to the common xalloc helpers and in doing so, makes memory allocation failures fatal rather than returning an error to the caller. I think this is acceptable behavior. Signed-off-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2010-10-01libmtd: unify some error messagesMike Frysinger
By using the same error message string, we only need one copy of it in memory at runtime. Signed-off-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2010-09-25libmtd: add lock/unlock helpersMike Frysinger
Signed-off-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2010-09-24libmtd: unify erase block argument checkingMike Frysinger
Signed-off-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2010-07-26libmtd: add OOB read and write interfacesArtem Bityutskiy
This patch is based on Kevin Cernekee's patch posted to the MTD mailing list. It adds 'mtd_read_oob()' and 'mtd_write_oob()' interfaces support. The interfaces use MEMREADOOB64/MEMWRITEOOB64 MTD ioctls if possible, and fall-back to MEMREADOOB/MEMWRITEOOB if the 64-bit versions are not supported. The information about ioctls support is then cashed in 'offs64_ioctls' libmtd flag. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2010-07-26libmtd: support MEMERASE64Artem Bityutskiy
This patch is base on Kevin Cernekee's patch posted to the MTD mailing list. It adds MEMERASE64 support to the 'mtd_erase()' call. Now it first tries to use MEMERASE64, and if that is not supported, falls back to the old MEMERASE ioctl. This patch also introduces an 'offs64_ioctl' flag to the libmtd descriptor. However, we cannot initialize it in 'libmtd_open()', because we need an MTD device node, which we do not have in 'libmtd_open()'. Thus, we firs mark this flag as "uninitialized", and at the first invocation of 'mtd_erase()' we initialize it. This also means that we have to pass the limbtd descriptor to 'mtd_erase()', to save the flag value. This, in turn, requires tweaking 'mtd_erase()' users. This is not very nice, but good enough so far. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2010-07-13mtd-utils: move libmtd source files to lib/ subdirectoryKevin Cernekee
Source files for libmtd, crc32, and fec are scattered throughout the tree. Move them to a central location so they can be built into a common "libmtd.a" library used by all mtd-utils programs. This patch only renames/deletes files and does not change the content. Also modify the build system and source code so that libmtd.a can be built from a "common" location (lib/). Statically link all utilities at the top level with libmtd.a . Minor changes to mkfs.ubifs to allow using the common crc32 implementation. Signed-off-by: Kevin Cernekee <cernekee@gmail.com> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
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