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* treewide: Use fallthrough pseudo-keywordGustavo A. R. Silva2020-08-241-1/+1
| | | | | | | | | | Replace the existing /* fall through */ comments and its variants with the new pseudo-keyword macro fallthrough[1]. Also, remove unnecessary fall-through markings when it is the case. [1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
* jffs2: fix use-after-free on symlink traversalAl Viro2019-04-011-5/+0
| | | | | | | | free the symlink body after the same RCU delay we have for freeing the struct inode itself, so that traversal during RCU pathwalk wouldn't step into freed memory. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* jffs2: fix spelling mistake: "requestied" -> "requested"Colin Ian King2017-04-191-1/+1
| | | | | | | | trivial fix to spelling mistake in JFFS2_ERROR message Signed-off-by: Colin Ian King <colin.king@canonical.com> [Brian: also fix 'an' -> 'a'] Signed-off-by: Brian Norris <computersforpeace@gmail.com>
* vfs: make the string hashes salt the hashLinus Torvalds2016-06-111-1/+1
| | | | | | | | | | | | | | | | | | We always mixed in the parent pointer into the dentry name hash, but we did it late at lookup time. It turns out that we can simplify that lookup-time action by salting the hash with the parent pointer early instead of late. A few other users of our string hashes also wanted to mix in their own pointers into the hash, and those are updated to use the same mechanism. Hash users that don't have any particular initial salt can just use the NULL pointer as a no-salt. Cc: Vegard Nossum <vegard.nossum@oracle.com> Cc: George Spelvin <linux@sciencehorizons.net> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* jffs2: fix a memleak in read_direntry()Wei Fang2015-10-041-1/+5
| | | | | | | | Need to free the memory allocated for 'fd' if failed to read all of the remainder name. Signed-off-by: Wei Fang <fangwei1@huawei.com> Signed-off-by: Brian Norris <computersforpeace@gmail.com>
* jffs2: fix unbalanced lockingBrian Norris2015-05-081-23/+4
| | | | | | | | | | | | | | | | | | | Li Zefan reported an unbalanced locking issue, found by his internal debugging feature on runtime. The particular case he was looking at doesn't lead to a deadlock, as the structure that this lock is embedded in is freed on error. But we should straighten out the error handling. Because several callers of jffs2_do_read_inode_internal() / jffs2_do_read_inode() already handle the locking/unlocking and inode clearing at their own level, let's just push any unlocks/clearing down to the caller. This consistency is much easier to verify. Reported-by: Li Zefan <lizefan@huawei.com> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Brian Norris <computersforpeace@gmail.com>
* jffs2: Drop bogus if in commentGeert Uytterhoeven2014-11-291-1/+1
| | | | | | | Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Cc: David Woodhouse <dwmw2@infradead.org> Cc: linux-mtd@lists.infradead.org Signed-off-by: Brian Norris <computersforpeace@gmail.com>
* fs/jffs2: use rbtree postorder iteration helper instead of opencodingCody P Schafer2014-01-241-23/+3
| | | | | | | | | | | | Use rbtree_postorder_for_each_entry_safe() to destroy the rbtree instead of opencoding an alternate postorder iteration that modifies the tree Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com> Cc: Michel Lespinasse <walken@google.com> Cc: Jan Kara <jack@suse.cz> Cc: David Woodhouse <dwmw2@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* rbtree: move some implementation details from rbtree.h to rbtree.cMichel Lespinasse2012-10-091-5/+8
| | | | | | | | | | | | | | | | | | | rbtree users must use the documented APIs to manipulate the tree structure. Low-level helpers to manipulate node colors and parenthood are not part of that API, so move them to lib/rbtree.c [dwmw2@infradead.org: fix jffs2 build issue due to renamed __rb_parent_color field] Signed-off-by: Michel Lespinasse <walken@google.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Acked-by: David Woodhouse <David.Woodhouse@intel.com> Cc: Rik van Riel <riel@redhat.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Daniel Santos <daniel.santos@pobox.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* jffs2: allow to complete xattr integrity check on first GC scanJean-Christophe DUBOIS2012-05-141-0/+1
| | | | | | | | | | | | | | | | | | | | | Unlike file data integrity the xattr data integrity was not checked before some explicit access to the attribute was made. This could leave in the system a number of corrupted extended attributes which will be detected only at access time and possibly at a very late time compared to the time the corruption actually happened. This patch adds the ability to check for extended attribute integrity on first GC scan pass (similar to file data integrity check). This allows for all present attributes to be completly verified before any use of them. In order to work correctly this patch also needs the patch allowing JFFS2 to discriminate between recoverable and non recoverable errors on extended attributes. Signed-off-by: Jean-Christophe DUBOIS <jcd@tribudubois.net> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
* jffs2: refactor csize usage in jffs2_do_read_inode_internal()Xi Wang2012-05-141-6/+6
| | | | | | | | | | Replace the verbose `je32_to_cpu(latest_node->csize)' with a shorter `csize'. Signed-off-by: Xi Wang <xi.wang@gmail.com> Cc: Artem Bityutskiy <dedekind1@gmail.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
* jffs2: validate symlink size in jffs2_do_read_inode_internal()Xi Wang2012-05-141-0/+6
| | | | | | | | | | | | | | | | | `csize' is read from disk and thus needs validation. Otherwise a bogus value 0xffffffff would turn the subsequent kmalloc(csize + 1, ...) into kmalloc(0, ...), leading to out-of-bounds write. This patch limits `csize' to JFFS2_MAX_NAME_LEN, which is also used in jffs2_symlink(). Artem: we actually validate csize by checking CRC, so this 0xFFs cannot come from empty flash region. But I guess an attacker could feed JFFS2 an image with random csize value, including 0xFFs. Signed-off-by: Xi Wang <xi.wang@gmail.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
* jffs2: Use pr_fmt and remove jffs: from formatsJoe Perches2012-03-271-0/+2
| | | | | | | | | | Use pr_fmt to prefix KBUILD_MODNAME to appropriate logging messages. Remove now unnecessary internal prefixes from formats. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
* mtd: do use mtd->point directlyArtem Bityutskiy2012-01-091-10/+8
| | | | | | | | Remove direct usage of the "mtd->point" function pointer. Instead, test the mtd_point() return code for '-EOPNOTSUPP'. Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
* mtd: introduce mtd_unpoint interfaceArtem Bityutskiy2012-01-091-3/+3
| | | | | Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
* mtd: introduce mtd_point interfaceArtem Bityutskiy2012-01-091-2/+2
| | | | | Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
* fs: Merge split stringsJean Delvare2011-07-221-1/+1
| | | | | | | No idea why these were split in the first place... Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
* Fix common misspellingsLucas De Marchi2011-03-311-1/+1
| | | | | | Fixes generated by 'codespell' and manually reviewed. Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
* jffs2: fix up rb_root initializations to use RB_ROOTVenkatesh Pallipadi2010-03-181-1/+1
| | | | | | | | | | | | | | | jffs2 uses rb_node = NULL; to zero rb_root. The problem with this is that 17d9ddc72fb8bba0d4f678 ("rbtree: Add support for augmented rbtrees") in the linux-next tree adds a new field to that struct which needs to be NULL as well. This patch uses RB_ROOT as the intializer so all of the relevant fields will be NULL'd. Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Cc: Eric Paris <eparis@redhat.com> Acked-by: David Woodhouse <dwmw2@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Merge git://git.infradead.org/mtd-2.6Linus Torvalds2009-12-161-1/+1
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * git://git.infradead.org/mtd-2.6: (90 commits) jffs2: Fix long-standing bug with symlink garbage collection. mtd: OneNAND: Fix test of unsigned in onenand_otp_walk() mtd: cfi_cmdset_0002, fix lock imbalance Revert "mtd: move mxcnd_remove to .exit.text" mtd: m25p80: add support for Macronix MX25L4005A kmsg_dump: fix build for CONFIG_PRINTK=n mtd: nandsim: add support for 4KiB pages mtd: mtdoops: refactor as a kmsg_dumper mtd: mtdoops: make record size configurable mtd: mtdoops: limit the maximum mtd partition size mtd: mtdoops: keep track of used/unused pages in an array mtd: mtdoops: several minor cleanups core: Add kernel message dumper to call on oopses and panics mtd: add ARM pismo support mtd: pxa3xx_nand: Fix PIO data transfer mtd: nand: fix multi-chip suspend problem mtd: add support for switching old SST chips into QRY mode mtd: fix M29W800D dev_id and uaddr mtd: don't use PF_MEMALLOC mtd: Add bad block table overrides to Davinci NAND driver ... Fixed up conflicts (mostly trivial) in drivers/mtd/devices/m25p80.c drivers/mtd/maps/pcmciamtd.c drivers/mtd/nand/pxa3xx_nand.c kernel/printk.c
| * jffs2: Fix error return in jffs2_do_read_inode_internal()Roel Kluin2009-11-301-1/+1
| | | | | | | | | | | | | | | | The returned error should stay negative Signed-off-by: Roel Kluin <roel.kluin@gmail.com> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
* | tree-wide: fix assorted typos all over the placeAndré Goddard Rosa2009-12-041-1/+1
|/ | | | | | | | | | That is "success", "unknown", "through", "performance", "[re|un]mapping" , "access", "default", "reasonable", "[con]currently", "temperature" , "channel", "[un]used", "application", "example","hierarchy", "therefore" , "[over|under]flow", "contiguous", "threshold", "enough" and others. Signed-off-by: André Goddard Rosa <andre.goddard@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
* switch jffs2 to inode->i_aclAl Viro2009-06-241-1/+0
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* [JFFS2] fix mount crash caused by removed nodesThomas Gleixner2009-02-211-9/+33
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | At scan time we observed following scenario: node A inserted node B inserted node C inserted -> sets overlapped flag on node B node A is removed due to CRC failure -> overlapped flag on node B remains while (tn->overlapped) tn = tn_prev(tn); ==> crash, when tn_prev(B) is referenced. When the ultimate node is removed at scan time and the overlapped flag is set on the penultimate node, then nothing updates the overlapped flag of that node. The overlapped iterators blindly expect that the ultimate node does not have the overlapped flag set, which causes the scan code to crash. It would be a huge overhead to go through the node chain on node removal and fix up the overlapped flags, so detecting such a case on the fly in the overlapped iterators is a simpler and reliable solution. Cc: stable@kernel.org Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
* [MTD][NOR] Add physical address to point() methodJared Hulbert2008-05-011-4/+5
| | | | | | | | | | | | Adding the ability to get a physical address from point() in addition to virtual address. This physical address is required for XIP of userspace code from flash. Signed-off-by: Jared Hulbert <jaredeh@gmail.com> Reviewed-by: Jörn Engel <joern@logfs.org> Acked-by: Nicolas Pitre <nico@cam.org> Acked-by: Greg Ungerer <gerg@uclinux.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* [JFFS2] Track parent inode for directories (for NFS export)David Woodhouse2008-05-011-3/+4
| | | | | | | | To support NFS export, we need to know the parent inode of directories. Rather than growing the jffs2_inode_cache structure, share space with the nlink field -- which was always set to 1 for directories anyway. Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* [JFFS2] Introduce dbg_readinode2 log level, use it to shut read_dnode() upDavid Woodhouse2008-04-231-7/+8
| | | | | | | We haven't seen bugs in this for a while now, since the rewrite. No need to be _quite_ so verbose... Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* [JFFS2] semaphore->mutex conversionDavid Woodhouse2008-04-221-11/+12
| | | | Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* Merge git://git.infradead.org/mtd-2.6Linus Torvalds2008-02-071-15/+16
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * git://git.infradead.org/mtd-2.6: (120 commits) [MTD] Fix mtdoops.c compilation [MTD] [NOR] fix startup lock when using multiple nor flash chips [MTD] [DOC200x] eccbuf is statically defined and always evaluate to true [MTD] Fix maps/physmap.c compilation with CONFIG_PM [MTD] onenand: Add panic_write function to the onenand driver [MTD] mtdoops: Use the panic_write function when present [MTD] Add mtd panic_write function pointer [MTD] [NAND] Freescale enhanced Local Bus Controller FCM NAND support. [MTD] physmap.c: Add support for multiple resources [MTD] [NAND] Fix misparenthesization introduced by commit 78b65179... [MTD] [NAND] Fix Blackfin NFC ECC calculating bug with page size 512 bytes [MTD] [NAND] Remove wrong operation in PM function of the BF54x NFC driver [MTD] [NAND] Remove unused variable in plat_nand_remove [MTD] Unlocking all Intel flash that is locked on power up. [MTD] [NAND] at91_nand: Make mtdparts option can override board info [MTD] mtdoops: Various minor cleanups [MTD] mtdoops: Ensure sequential write to the buffer [MTD] mtdoops: Perform write operations in a workqueue [MTD] mtdoops: Add further error return code checking [MTD] [NOR] Test devtype, not definition in flash_probe(), drivers/mtd/devices/lart.c ...
| * [JFFS2] Fix return value check for mtd->point() in check_node_data()Alexey Korolev2007-11-281-1/+1
| | | | | | | | | | | | | | | | If we ask it to map 'len' bytes of the device, don't compare against some other number and whine that it's different. That's a little silly. Signed-off-by: Alexey Korolev <akorolev@infradead.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
| * [JFFS2] Fix data CRC checking on NOR flash.David Woodhouse2007-11-211-14/+15
| | | | | | | | | | | | | | We were failing to check the data CRC on data nodes on non-writebuffered flash, which led to "interesting" behaviour on unclean shutdowns. Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* | Typoes: "whith" -> "with"Robert P. J. Day2008-02-031-1/+1
|/ | | | | Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca> Signed-off-by: Adrian Bunk <bunk@kernel.org>
* [JFFS2] Fix unpoint lengthAndy Lowe2007-09-231-1/+1
| | | | | | | | | | Fix a couple of instances in JFFS2 where the unpoint() routine is being called with the wrong length in cases where the point() routine truncated a request. Signed-off-by: Andy Lowe <alowe@mvista.com> Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* [JFFS2] Whitespace cleanups.David Woodhouse2007-07-101-3/+3
| | | | | | Convert many spaces to tabs; one or two other minor cosmetic fixes. Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* [JFFS2] Print correct node offset when complaining about broken data CRCDavid Woodhouse2007-07-051-1/+1
| | | | | | | Debugging the hardware problems in OLPC trac #1905 would be a whole lot easier if the correct node offsets were printed for the offending nodes. Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* [JFFS2] Fix readinode failure when read_dnode() detects CRC failure.David Woodhouse2007-07-031-14/+9
| | | | | | | | We should have stopped returning 1 from read_dnode() to indicate failure. We can just mark the damn thing obsolete immediately. But I missed a case where we don't. Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* [JFFS2] Deletion dirents should be REF_NORMAL, not REF_PRISTINE.David Woodhouse2007-06-291-1/+1
| | | | | | | Otherwise they'll never actually get garbage-collected. Noted by Jonathan Larmour. Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* [JFFS2] Fix obsoletion of metadata nodes in jffs2_add_tn_to_tree()David Woodhouse2007-06-011-3/+10
| | | | | | | We should keep the mdata node with higher version number, not just the one we happen to find latest. Doh. Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* [JFFS2] Fix buffer length calculations in jffs2_get_inode_nodes()Artem Bityutskiy2007-06-011-3/+6
| | | | | | | If we have already read enough bytes, no need to call read_more(). Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* [JFFS2] Simplify and clean up jffs2_add_tn_to_tree() some more.David Woodhouse2007-05-081-17/+12
| | | | | | Fixing at least a couple more bugs in the process. Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* [JFFS2] Remove another bogus optimisation in jffs2_add_tn_to_tree()David Woodhouse2007-05-071-14/+9
| | | | | | | | | | | | We attempted to insert new nodes into the tree by just using rb_replace_node to let them replace an earlier node which they completely overlapped. However, that could place the new node into the wrong place in the tree, since its start could be node only before the start of the victim, but before the node _before_ the victim in the tree (if that previous node actually ends _after_ the new node, thus isn't entirely overlapped and wasn't itself chosen to be the victim). Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* [JFFS2] Remove broken insert_point optimisation in jffs2_add_tn_to_tree()David Woodhouse2007-05-061-18/+7
| | | | | | | | | | | | | | | The original code would remember, during the first pass over the tree, a suitable place to start the insertion from when we eventually come to add a new node. The optimisation was broken, and we sometimes ended up inserting a new node in the wrong place because we started the insertion from the wrong point. Just ditch the optimisation and start the insertion from the root of the tree, for now. I'll try it again when I'm feeling cleverer. Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* [JFFS2] Remember to calculate overlap on nodes which replace older nodesDavid Woodhouse2007-05-051-7/+8
| | | | | | | | | This fixes a problem Artem found with the integck test tool -- we weren't correctly keeping track of the 'overlap' flag in some cases, which led to the nodes being played back in an incorrect order and file corruption. Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* [JFFS2] Handle inodes with only a single metadata node with non-zero isizeDavid Woodhouse2007-04-251-2/+7
| | | | | | | | This should never happen unless there's corruption on the medium and the actual data nodes go missing. But the failure mode (an oops when we assume the fragtree isn't empty and go looking for its last node) isn't useful. Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* [JFFS2] Tidy up licensing/copyright boilerplate.David Woodhouse2007-04-251-3/+1
| | | | | | | | | | | | | | In particular, remove the bit in the LICENCE file about contacting Red Hat for alternative arrangements. Their errant IS department broke that arrangement a long time ago -- the policy of collecting copyright assignments from contributors came to an end when the plug was pulled on the servers hosting the project, without notice or reason. We do still dual-license it for use with eCos, with the GPL+exception licence approved by the FSF as being GPL-compatible. It's just that nobody has the right to license it differently. Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* [JFFS2] Better fix for all-zero node headersJoakim Tjernlund2007-04-251-4/+4
| | | | | | | | | | | No need to check for all-zero header since the header cannot be zero due to other checks. Replace the all-zero header check in readinode.c with a check for the magic word. Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* [JFFS2] Improve read_inode memory usage, v2.David Woodhouse2007-04-251-137/+595
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We originally used to read every node and allocate a jffs2_tmp_dnode_info structure for each, before processing them in (reverse) version order and discarding the ones which are obsoleted by later nodes. With huge logfiles, this behaviour caused memory problems. For example, a file involved in OLPC trac #1292 has 1822391 nodes, and would cause the XO machine to run out of memory during the first stage of read_inode(). Instead of just inserting nodes into a tree in version order as we find them, we now put them into a tree in order of their offset within the file, which allows us to immediately discard nodes which are completely obsoleted. We don't use a full tree with 'fragments' pointing to the real data structure, as we do in the normal fragtree. We sort only on the start address, and add an 'overlapped' flag to the tmp_dnode_info to indicate that the node in question is (partially) overlapped by another. When the scan is complete, we start at the end of the file, adding each node to a real fragtree as before. Where the node is non-overlapped, we just add it (it doesn't matter that it's not the latest version; there is no overlap). When the node at the end of the tree _is_ overlapped, we sort it and all its overlapping nodes into version order and then add them to the fragtree in that order. This 'early discard' reduces the peak allocation of tmp_dnode_info structures from 1.8M to a mere 62872 (3.5%) in the degenerate case referenced above. This version of the patch also correctly rememembers the highest node version# seen for an inode when it's scanned. Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* [JFFS2] fix buffer sise calculations in jffs2_get_inode_nodes()Artem Bityutskiy2007-04-171-65/+33
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In read inode we have an optimization which prevents one min. I/O unit (e.g. NAND page) to be read more then once. Namely, at the beginning we do not know which node type we read, so we read so we assume we read the directory entry, because it has the smallest node header. When we read it, we read up to the next min. I/O unit, just because if later we'll need to read more, we already have this data. If it turns out to be that the node is not directory entry, and we need more data, and we did not read it because it sits in the next min. I/O unit, we read the whole next (or several next) min. I/O unit(s). And if it happens to be that we read a data node, and we've read part of its data, we calculate partial CRC. So if later we need to check data CRC, we'll only read the rest of the data from further min. I/O units and continue CRC checking. This code was a bit messy and buggy. The bug was that it assumed relatively large min. I/O unit, so that the largest node header could overlap only one min. I/O unit boundary. This parch clean-ups the code a bit and fixes this bug. The patch was not tested on flash with small min. I/O unit, like NOR-ECC, nut it was tested on NAND with 512 bytes NAND page, so it at least does not break NAND. It was also tested with mtdram so it should not break NOR. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* [JFFS2] Check for all-zero node headersDavid Woodhouse2007-03-091-1/+15
| | | | | | | | Due to a poor choice of CRC32 seed, a node header which is all zeroes would pass the CRC32 check. Explicitly check for this case, and treat it as we do a CRC failure. Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* [JFFS2] replace kmalloc+memset with kzallocYan Burman2006-12-101-2/+1
| | | | | | | | Replace kmalloc+memset with kzalloc Signed-off-by: Yan Burman <burman.yan@gmail.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
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