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* Merge tag 'upstream-4.2-rc1' of git://git.infradead.org/linux-ubifsLinus Torvalds2015-06-251-1/+4
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pull UBI/UBIFS updates from Richard Weinberger: "Minor fixes for UBI and UBIFS" * tag 'upstream-4.2-rc1' of git://git.infradead.org/linux-ubifs: UBI: Remove unnecessary `\' UBI: Use static class and attribute groups UBI: add a helper function for updatting on-flash layout volumes UBI: Fastmap: Do not add vol if it already exists UBI: Init vol->reserved_pebs by assignment UBI: Fastmap: Rename variables to make them meaningful UBI: Fastmap: Remove unnecessary `\' UBI: Fastmap: Use max() to get the larger value ubifs: fix to check error code of register_shrinker UBI: block: Dynamically allocate minor numbers
| * ubifs: fix to check error code of register_shrinkerChao Yu2015-06-021-1/+4
| | | | | | | | | | | | | | | | | | | | register_shrinker() in ubifs_init() can fail due to fail to call kzalloc. This patch fixes to check the return value of register_shrinker, otherwise our shrinker may be unregistered after ubifs initialized successfully. Signed-off-by: Chao Yu <chao2.yu@samsung.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: Richard Weinberger <richard@nod.at>
* | ubifs: switch to simple_follow_link()Al Viro2015-05-103-10/+3
|/ | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* Merge branch 'for-linus' of ↵Linus Torvalds2015-04-264-16/+16
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull fourth vfs update from Al Viro: "d_inode() annotations from David Howells (sat in for-next since before the beginning of merge window) + four assorted fixes" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: RCU pathwalk breakage when running into a symlink overmounting something fix I_DIO_WAKEUP definition direct-io: only inc/dec inode->i_dio_count for file systems fs/9p: fix readdir() VFS: assorted d_backing_inode() annotations VFS: fs/inode.c helpers: d_inode() annotations VFS: fs/cachefiles: d_backing_inode() annotations VFS: fs library helpers: d_inode() annotations VFS: assorted weird filesystems: d_inode() annotations VFS: normal filesystems (and lustre): d_inode() annotations VFS: security/: d_inode() annotations VFS: security/: d_backing_inode() annotations VFS: net/: d_inode() annotations VFS: net/unix: d_backing_inode() annotations VFS: kernel/: d_inode() annotations VFS: audit: d_backing_inode() annotations VFS: Fix up some ->d_inode accesses in the chelsio driver VFS: Cachefiles should perform fs modifications on the top layer only VFS: AF_UNIX sockets should call mknod on the top layer only
| * VFS: normal filesystems (and lustre): d_inode() annotationsDavid Howells2015-04-154-16/+16
| | | | | | | | | | | | | | that's the bulk of filesystem drivers dealing with inodes of their own Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* | Merge tag 'upstream-4.1-rc1' of git://git.infradead.org/linux-ubifsLinus Torvalds2015-04-1525-429/+436
|\ \ | |/ |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pull UBI/UBIFS updates from Richard Weinberger: "This pull request includes the following UBI/UBIFS changes: - powercut emulation for UBI - a huge update to UBI Fastmap - cleanups and bugfixes all over UBI and UBIFS" * tag 'upstream-4.1-rc1' of git://git.infradead.org/linux-ubifs: (50 commits) UBI: power cut emulation for testing UBIFS: fix output format of INUM_WATERMARK UBI: Fastmap: Fall back to scanning mode after ECC error UBI: Fastmap: Remove is_fm_block() UBI: Fastmap: Add blank line after declarations UBI: Fastmap: Remove else after return. UBI: Fastmap: Introduce may_reserve_for_fm() UBI: Fastmap: Introduce ubi_fastmap_init() UBI: Fastmap: Wire up WL accessor functions UBI: Add accessor functions for WL data structures UBI: Move fastmap specific functions out of wl.c UBI: Fastmap: Add new module parameter fm_debug UBI: Fastmap: Make self_check_eba() depend on fastmap self checking UBI: Fastmap: Add self check to detect absent PEBs UBI: Fix stale pointers in ubi->lookuptbl UBI: Fastmap: Enhance fastmap checking UBI: Add initial support for fastmap self checks UBI: Fastmap: Rework fastmap error paths UBI: Fastmap: Prepare for variable sized fastmaps UBI: Fastmap: Locking updates ...
| * UBIFS: fix output format of INUM_WATERMARKSheng Yong2015-04-131-1/+1
| | | | | | | | | | | | | | | | | | | | | | The INUM_WATERMARK is a unsigned 32bit value, `%d' prints it as negatave: [ 103.682255] UBIFS warning (ubi0:0 pid 691): ubifs_new_inode: running out of inode numbers (current 122763, max -256) Fix it as: [ 154.422940] UBIFS warning (ubi0:0 pid 688): ubifs_new_inode: running out of inode numbers (current 122765, max 4294967040) Signed-off-by: Sheng Yong <shengyong1@huawei.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
| * UBIFS: extend debug/message capabilitiesSheng Yong2015-03-2525-409/+419
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In the case where we have more than one volumes on different UBI devices, it may be not that easy to tell which volume prints the messages. Add ubi number and volume id in ubifs_msg/warn/error to help debug. These two values are passed by struct ubifs_info. For those where ubifs_info is not initialized yet, ubifs_* is replaced by pr_*. For those where ubifs_info is not avaliable, ubifs_info is passed to the calling function as a const parameter. The output looks like, [ 95.444879] UBIFS (ubi0:1): background thread "ubifs_bgt0_1" started, PID 696 [ 95.484688] UBIFS (ubi0:1): UBIFS: mounted UBI device 0, volume 1, name "test1" [ 95.484694] UBIFS (ubi0:1): LEB size: 126976 bytes (124 KiB), min./max. I/O unit sizes: 2048 bytes/2048 bytes [ 95.484699] UBIFS (ubi0:1): FS size: 30220288 bytes (28 MiB, 238 LEBs), journal size 1523712 bytes (1 MiB, 12 LEBs) [ 95.484703] UBIFS (ubi0:1): reserved for root: 1427378 bytes (1393 KiB) [ 95.484709] UBIFS (ubi0:1): media format: w4/r0 (latest is w4/r0), UUID 40DFFC0E-70BE-4193-8905-F7D6DFE60B17, small LPT model [ 95.489875] UBIFS (ubi1:0): background thread "ubifs_bgt1_0" started, PID 699 [ 95.529713] UBIFS (ubi1:0): UBIFS: mounted UBI device 1, volume 0, name "test2" [ 95.529718] UBIFS (ubi1:0): LEB size: 126976 bytes (124 KiB), min./max. I/O unit sizes: 2048 bytes/2048 bytes [ 95.529724] UBIFS (ubi1:0): FS size: 19808256 bytes (18 MiB, 156 LEBs), journal size 1015809 bytes (0 MiB, 8 LEBs) [ 95.529727] UBIFS (ubi1:0): reserved for root: 935592 bytes (913 KiB) [ 95.529733] UBIFS (ubi1:0): media format: w4/r0 (latest is w4/r0), UUID EEB7779D-F419-4CA9-811B-831CAC7233D4, small LPT model [ 954.264767] UBIFS error (ubi1:0 pid 756): ubifs_read_node: bad node type (255 but expected 6) [ 954.367030] UBIFS error (ubi1:0 pid 756): ubifs_read_node: bad node at LEB 0:0, LEB mapping status 1 Signed-off-by: Sheng Yong <shengyong1@huawei.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
| * UBIFS: simplify returnsFabian Frederick2015-03-251-8/+2
| | | | | | | | | | | | | | | | | | Directly return recover_head() and ubifs_leb_unmap() instead of storing value in err and testing it. Signed-off-by: Fabian Frederick <fabf@skynet.be> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
| * UBIFS: Fix trivial typos in commentsYannick Guerrini2015-03-251-7/+7
| | | | | | | | | | | | | | | | | | | | Change 'comress' to 'compress' Change 'inteval' to 'interval' Change 'disabe' to 'disable' Change 'nenver' to 'never' Signed-off-by: Yannick Guerrini <yguerrini@tomshardware.fr> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
| * UBIFS: do not write master node if need recoverySheng Yong2015-03-251-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The commits 781c571 ("UBIFS: intialize LPT earlier") and 0980119 ("UBIFS: fix-up free space earlier") move some initialization before marking the master node dirty. But the modification changes the conditions of writing master. If unclean umount happens, ubifs may fail when mounting. But trying to mount it will write new master nodes on the flash. This is useless but increasing sqnum. So check need_recovery before writing master node, and don't create new master node if filesystem needs recovery. The behavour of the bug shows at: http://lists.infradead.org/pipermail/linux-mtd/2015-February/057712.html Signed-off-by: Sheng Yong <shengyong1@huawei.com> Reviewed-by: Ben Gardiner <ben.l.gardiner@gmail.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
| * UBIFS: fix incorrect unlocking handlingTaesoo Kim2015-03-251-4/+7
| | | | | | | | | | | | | | | | | | | | | | When ubifs_init_security() fails, 'ui_mutex' is incorrectly unlocked and incorrectly restores 'i_size'. Fix this. Signed-off-by: Taesoo Kim <tsgatesv@gmail.com> Fixes: d7f0b70d30ff ("UBIFS: Add security.* XATTR support for the UBIFS") Reviewed-by: Ben Shelton <ben.shelton@ni.com> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
* | make new_sync_{read,write}() staticAl Viro2015-04-111-2/+0
| | | | | | | | | | | | | | | | All places outside of core VFS that checked ->read and ->write for being NULL or called the methods directly are gone now, so NULL {read,write} with non-NULL {read,write}_iter will do the right thing in all cases. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* | fs: move struct kiocb to fs.hChristoph Hellwig2015-03-251-1/+0
|/ | | | | | | | struct kiocb now is a generic I/O container, so move it to fs.h. Also do a #include diet for aio.h while we're at it. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* Merge branch 'for-linus-v3.20' of git://git.infradead.org/linux-ubifsLinus Torvalds2015-02-157-12/+148
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pull UBI and UBIFS updates from Richard Weinberger: - cleanups and bug fixes all over UBI and UBIFS - block-mq support for UBI Block - UBI volumes can now be renamed while they are in use - security.* XATTR support for UBIFS - a maintainer update * 'for-linus-v3.20' of git://git.infradead.org/linux-ubifs: UBI: block: Fix checking for NULL instead of IS_ERR() UBI: block: Continue creating ubiblocks after an initialization error UBIFS: return -EINVAL if log head is empty UBI: Block: Explain usage of blk_rq_map_sg() UBI: fix soft lockup in ubi_check_volume() UBI: Fastmap: Care about the protection queue UBIFS: add a couple of extra asserts UBI: do propagate positive error codes up UBI: clean-up printing helpers UBI: extend UBI layer debug/messaging capabilities - cosmetics UBIFS: add ubifs_err() to print error reason UBIFS: Add security.* XATTR support for the UBIFS UBIFS: Add xattr support for symlinks UBI: Block: Add blk-mq support UBI: Add initial support for scatter gather UBI: rename_volumes: Use UBI_METAONLY UBI: Implement UBI_METAONLY Add myself as UBI co-maintainer
| * UBIFS: return -EINVAL if log head is emptyhujianyang2015-02-101-3/+16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | CS node is recognized as a sign in UBIFS log replay mechanism. Log relaying during mount should find the CS node in log head at beginning and then replay the following uncommitted buds. Here is a bug in log replay path: If the log head, which is indicated by @log_lnum in mst_node, is empty, current UBIFS replay nothing and directly mount the partition without any warning. This action will put filesystem in an abnormal state, e.g. space management in LPT area is incorrect to the real space usage in main area. We reproduced this bug by fault injection: turn log head leb into all 0xFF. UBIFS driver mount the polluted partition normally. But errors occur while running fs_stress on this mount: [89068.055183] UBI error: ubi_io_read: error -74 (ECC error) while reading 59 bytes from PEB 711:33088, read 59 bytes [89068.179877] UBIFS error (pid 10517): ubifs_check_node: bad magic 0x101031, expected 0x6101831 [89068.179882] UBIFS error (pid 10517): ubifs_check_node: bad node at LEB 591:28992 [89068.179891] Not a node, first 24 bytes: [89068.179892] 00000000: 31 10 10 00 37 84 64 04 10 04 00 00 00 00 00 00 20 00 00 00 02 01 00 00 1...7.d......... ....... [89068.180282] UBIFS error (pid 10517): ubifs_read_node: expected node type 2 This patch fix the problem by checking *lnum* to guarantee the empty leb is not log head leb and return an error if the log head leb is incorrectly empty. After this, we could catch *log head empty* error in place. Signed-off-by: hujianyang <hujianyang@huawei.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
| * UBIFS: add a couple of extra assertsArtem Bityutskiy2015-01-281-0/+4
| | | | | | | | | | | | | | ... to catch possible memory corruptions. Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
| * UBIFS: add ubifs_err() to print error reasonSubodh Nijsure2015-01-281-4/+13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch adds ubifs_err() output to some error paths to tell the user what's going on. Artem: improve the messages, rename too long variable Signed-off-by: Subodh Nijsure <snijsure@grid-net.com> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de> Signed-off-by: Ben Shelton <ben.shelton@ni.com> Acked-by: Brad Mouring <brad.mouring@ni.com> Acked-by: Terry Wilcox <terry.wilcox@ni.com> Acked-by: Gratian Crisan <gratian.crisan@ni.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
| * UBIFS: Add security.* XATTR support for the UBIFSSubodh Nijsure2015-01-284-0/+99
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Artem: rename static functions so that they do not use the "ubifs_" prefix - we only use this prefix for non-static functions. Artem: remove few junk white-space changes in file.c Signed-off-by: Subodh Nijsure <snijsure@grid-net.com> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de> Signed-off-by: Ben Shelton <ben.shelton@ni.com> Acked-by: Brad Mouring <brad.mouring@ni.com> Acked-by: Terry Wilcox <terry.wilcox@ni.com> Acked-by: Gratian Crisan <gratian.crisan@ni.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
| * UBIFS: Add xattr support for symlinksSubodh Nijsure2015-01-282-5/+16
| | | | | | | | | | | | | | | | | | | | | | Artem: rename the __ubifs_setxattr() functions to just 'setxattr()'. Signed-off-by: Subodh Nijsure <snijsure@grid-net.com> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de> Signed-off-by: Ben Shelton <ben.shelton@ni.com> Acked-by: Terry Wilcox <terry.wilcox@ni.com> Acked-by: Gratian Crisan <gratian.crisan@ni.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
* | Merge branch 'for-3.20/bdi' of git://git.kernel.dk/linux-blockLinus Torvalds2015-02-122-6/+1
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pull backing device changes from Jens Axboe: "This contains a cleanup of how the backing device is handled, in preparation for a rework of the life time rules. In this part, the most important change is to split the unrelated nommu mmap flags from it, but also removing a backing_dev_info pointer from the address_space (and inode), and a cleanup of other various minor bits. Christoph did all the work here, I just fixed an oops with pages that have a swap backing. Arnd fixed a missing export, and Oleg killed the lustre backing_dev_info from staging. Last patch was from Al, unexporting parts that are now no longer needed outside" * 'for-3.20/bdi' of git://git.kernel.dk/linux-block: Make super_blocks and sb_lock static mtd: export new mtd_mmap_capabilities fs: make inode_to_bdi() handle NULL inode staging/lustre/llite: get rid of backing_dev_info fs: remove default_backing_dev_info fs: don't reassign dirty inodes to default_backing_dev_info nfs: don't call bdi_unregister ceph: remove call to bdi_unregister fs: remove mapping->backing_dev_info fs: export inode_to_bdi and use it in favor of mapping->backing_dev_info nilfs2: set up s_bdi like the generic mount_bdev code block_dev: get bdev inode bdi directly from the block device block_dev: only write bdev inode on close fs: introduce f_op->mmap_capabilities for nommu mmap support fs: kill BDI_CAP_SWAP_BACKED fs: deduplicate noop_backing_dev_info
| * | fs: remove mapping->backing_dev_infoChristoph Hellwig2015-01-202-5/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Now that we never use the backing_dev_info pointer in struct address_space we can simply remove it and save 4 to 8 bytes in every inode. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Reviewed-by: Tejun Heo <tj@kernel.org> Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Jens Axboe <axboe@fb.com>
| * | fs: introduce f_op->mmap_capabilities for nommu mmap supportChristoph Hellwig2015-01-201-1/+1
| |/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Since "BDI: Provide backing device capability information [try #3]" the backing_dev_info structure also provides flags for the kind of mmap operation available in a nommu environment, which is entirely unrelated to it's original purpose. Introduce a new nommu-only file operation to provide this information to the nommu mmap code instead. Splitting this from the backing_dev_info structure allows to remove lots of backing_dev_info instance that aren't otherwise needed, and entirely gets rid of the concept of providing a backing_dev_info for a character device. It also removes the need for the mtd_inodefs filesystem. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Tejun Heo <tj@kernel.org> Acked-by: Brian Norris <computersforpeace@gmail.com> Signed-off-by: Jens Axboe <axboe@fb.com>
* / mm: drop vm_ops->remap_pages and generic_file_remap_pages() stubKirill A. Shutemov2015-02-101-1/+0
|/ | | | | | | | | | Nobody uses it anymore. [akpm@linux-foundation.org: fix filemap_xip.c] Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Wu Fengguang <fengguang.wu@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* UBIFS: fix a couple bugs in UBIFS xattr length calculationSubodh Nijsure2014-11-071-1/+6
| | | | | | | | | | | | | | | The journal update function did not work for extended attributes properly, because extended attribute inodes carry the xattr data, and the size of this data was not taken into account. Artem: improved commit message, amended the patch a bit. Signed-off-by: Subodh Nijsure <snijsure@grid-net.com> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de> Signed-off-by: Ben Shelton <ben.shelton@ni.com> Acked-by: Brad Mouring <brad.mouring@ni.com> Acked-by: Gratian Crisan <gratian.crisan@ni.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
* UBIFS: fix budget leak in error pathArtem Bityutskiy2014-11-071-0/+1
| | | | | | | | We forgot to free the budget in 'write_begin_slow()' when 'do_readpage()' fails. This patch fixes the issue. Suggested-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
* UBIFS: Fix trivial typo in power_cut_emulated()Richard Weinberger2014-09-301-1/+1
| | | | | | | s/withing/within/ Signed-off-by: Richard Weinberger <richard@nod.at> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
* UBIFS: Align the dump messages of SB_NODEhujianyang2014-09-261-2/+2
| | | | | | | | I found the dump messages of UBIFS_SB_NODE is not aligned. This patch remove the extra space from the line which is retracted. Signed-off-by: hujianyang <hujianyang@huawei.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
* UBIFS: Remove bogus assertRichard Weinberger2014-09-191-4/+3
| | | | | | | | | | This assertion was only correct before UBIFS had xattr support. Now with xattr support also a directory node can carry data and can act as host node. Suggested-by: Artem Bityutskiy <dedekind1@gmail.com> Signed-off-by: Richard Weinberger <richard@nod.at> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
* UBIFS: fix free log space calculationArtem Bityutskiy2014-09-081-2/+6
| | | | | | | | | | | | | | | | | | | | | Hu (hujianyang <hujianyang@huawei.com>) discovered an issue in the 'empty_log_bytes()' function, which calculates how many bytes are left in the log: " If 'c->lhead_lnum + 1 == c->ltail_lnum' and 'c->lhead_offs == c->leb_size', 'h' would equalent to 't' and 'empty_log_bytes()' would return 'c->log_bytes' instead of 0. " At this point it is not clear what would be the consequences of this, and whether this may lead to any problems, but this patch addresses the issue just in case. Cc: stable@vger.kernel.org Tested-by: hujianyang <hujianyang@huawei.com> Reported-by: hujianyang <hujianyang@huawei.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
* UBIFS: fix a race conditionArtem Bityutskiy2014-09-082-8/+11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Hu (hujianyang@huawei.com) discovered a race condition which may lead to a situation when UBIFS is unable to mount the file-system after an unclean reboot. The problem is theoretical, though. In UBIFS, we have the log, which basically a set of LEBs in a certain area. The log has the tail and the head. Every time user writes data to the file-system, the UBIFS journal grows, and the log grows as well, because we append new reference nodes to the head of the log. So the head moves forward all the time, while the log tail stays at the same position. At any time, the UBIFS master node points to the tail of the log. When we mount the file-system, we scan the log, and we always start from its tail, because this is where the master node points to. The only occasion when the tail of the log changes is the commit operation. The commit operation has 2 phases - "commit start" and "commit end". The former is relatively short, and does not involve much I/O. During this phase we mostly just build various in-memory lists of the things which have to be written to the flash media during "commit end" phase. During the commit start phase, what we do is we "clean" the log. Indeed, the commit operation will index all the data in the journal, so the entire journal "disappears", and therefore the data in the log become unneeded. So we just move the head of the log to the next LEB, and write the CS node there. This LEB will be the tail of the new log when the commit operation finishes. When the "commit start" phase finishes, users may write more data to the file-system, in parallel with the ongoing "commit end" operation. At this point the log tail was not changed yet, it is the same as it had been before we started the commit. The log head keeps moving forward, though. The commit operation now needs to write the new master node, and the new master node should point to the new log tail. After this the LEBs between the old log tail and the new log tail can be unmapped and re-used again. And here is the possible problem. We do 2 operations: (a) We first update the log tail position in memory (see 'ubifs_log_end_commit()'). (b) And then we write the master node (see the big lock of code in 'do_commit()'). But nothing prevents the log head from moving forward between (a) and (b), and the log head may "wrap" now to the old log tail. And when the "wrap" happens, the contends of the log tail gets erased. Now a power cut happens and we are in trouble. We end up with the old master node pointing to the old tail, which was erased. And replay fails because it expects the master node to point to the correct log tail at all times. This patch merges the abovementioned (a) and (b) operations by moving the master node change code to the 'ubifs_log_end_commit()' function, so that it runs with the log mutex locked, which will prevent the log from being changed benween operations (a) and (b). Cc: stable@vger.kernel.org # 07e19df UBIFS: remove mst_mutex Cc: stable@vger.kernel.org Reported-by: hujianyang <hujianyang@huawei.com> Tested-by: hujianyang <hujianyang@huawei.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
* UBIFS: Add log overlap assertionshujianyang2014-07-311-0/+2
| | | | | | | | | | | | | | We use a circle area to record the log nodes in ubifs. This log area should not be overlapped. But after researching the code, I found some conditions may lead log head wraps log ltail. Although we've fixed the problems discovered, there may be some other issues still left. This patch adds assertions where lhead changes to next leb to make sure ltail is not wrapped. Signed-off-by: hujianyang <hujianyang@huawei.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
* Revert "UBIFS: add a log overlap assertion"Artem Bityutskiy2014-07-281-1/+0
| | | | | | | | This reverts commit 545f7fdf6db866c26ac92346b35bc6489fb926d1. Hujianyang's testing revealed that the patch is bogus. Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
* UBIFS: add a log overlap assertionArtem Bityutskiy2014-07-191-0/+1
| | | | | | | | Add an assertion which checkes that the head of the log never overlaps with the tail of the log. Suggested-by: hujianyang <hujianyang@huawei.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
* UBIFS: remove unnecessary checkArtem Bityutskiy2014-07-191-6/+4
| | | | | | | | Remove the "if (c->lhead_offs == 0)" check because is unnecessary, since at that point the log head offset is guaranteed to be zero due to the previous operation. Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
* UBIFS: remove mst_mutexArtem Bityutskiy2014-07-194-9/+3
| | | | | | | | | The 'mst_mutex' is not needed since because 'ubifs_write_master()' is only called on the mount path and commit path. The mount path is sequential and there is no parallelism, and the commit path is also serialized - there is only one commit going on at a time. Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
* UBIFS: kernel-doc warning fixFabian Frederick2014-07-191-1/+1
| | | | | | | s/data/timer Signed-off-by: Fabian Frederick <fabf@skynet.be> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
* UBIFS: replace seq_printf by seq_putsFabian Frederick2014-07-191-6/+6
| | | | | | | | | | | | | | | | | | | | Fix checkpatch warnings: "WARNING: Prefer seq_puts to seq_printf" Andrew Morton wrote: " - puts is presumably faster - puts doesn't go rogue if you accidentally pass it a "%". - this patch actually made fs/ubifs/super.o 12 bytes smaller. Perhaps because seq_printf() is a varargs function, forcing the caller to pass args on the stack instead of in registers. " Signed-off-by: Fabian Frederick <fabf@skynet.be> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
* UBIFS: replace count*size kzalloc by kcallocFabian Frederick2014-07-191-2/+2
| | | | | | | kcalloc manages count*sizeof overflow. Signed-off-by: Fabian Frederick <fabf@skynet.be> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
* UBIFS: kernel-doc warning fixFabian Frederick2014-07-191-1/+0
| | | | | | | No grouped argument in drop_last_node. Signed-off-by: Fabian Frederick <fabf@skynet.be> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
* UBIFS: fix error path in create_default_filesystem()hujianyang2014-07-191-0/+2
| | | | | | | | | In the end of 'create_default_filesystem()' we need to check the return value of 'ubifs_write_node()' to ensure that we have successfully written the 'cs_node'. Signed-off-by: hujianyang <hujianyang@huawei.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
* UBIFS: fix spelling of "scanned"Artem Bityutskiy2014-07-192-3/+3
| | | | | | | Randy Dunlap pointed that we should use "scanned" instead of "scaned". This patch makes the correction. Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
* UBIFS: fix some commentsSeunghun Lee2014-07-192-5/+4
| | | | | | | This patch fixes some comments about return type. Signed-off-by: Seunghun Lee <waydi1@gmail.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
* UBIFS: remove useless @ecc in struct ubifs_scan_lebhujianyang2014-07-192-5/+4
| | | | | | | | | | | We set @ecc in ubifs_scan_leb only if leb_read returns EBADMSG and do not use it any more. This patch removes this variable and adds comments about EBADMSG handling. Artem: re-phrase commentaries Signed-off-by: hujianyang <hujianyang@huawei.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
* UBIFS: remove useless statementshujianyang2014-07-197-10/+2
| | | | | | | This patch removes useless and duplicate statements. Signed-off-by: hujianyang <hujianyang@huawei.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
* UBIFS: Add missing break statements in dbg_chk_pnode()hujianyang2014-07-191-0/+2
| | | | | | | | | | This is a minor fix. These two branches in 'dbg_chk_pnode()' are dealing with different conditions. Although there is no fault in current state, I think adding "break"s in each end of branch is better. Signed-off-by: hujianyang <hujianyang@huawei.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
* UBIFS: fix error handling in dump_lpt_leb()hujianyang2014-07-191-0/+5
| | | | | | | | | This patch checks the return value of 'ubifs_unpack_nnode()'. If this function returns an error, 'nnode' may not be initialized, so just print an error message and break. Signed-off-by: hujianyang <hujianyang@huawei.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
* Merge branch 'for-linus' of ↵Linus Torvalds2014-06-121-15/+10
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull vfs updates from Al Viro: "This the bunch that sat in -next + lock_parent() fix. This is the minimal set; there's more pending stuff. In particular, I really hope to get acct.c fixes merged this cycle - we need that to deal sanely with delayed-mntput stuff. In the next pile, hopefully - that series is fairly short and localized (kernel/acct.c, fs/super.c and fs/namespace.c). In this pile: more iov_iter work. Most of prereqs for ->splice_write with sane locking order are there and Kent's dio rewrite would also fit nicely on top of this pile" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (70 commits) lock_parent: don't step on stale ->d_parent of all-but-freed one kill generic_file_splice_write() ceph: switch to iter_file_splice_write() shmem: switch to iter_file_splice_write() nfs: switch to iter_splice_write_file() fs/splice.c: remove unneeded exports ocfs2: switch to iter_file_splice_write() ->splice_write() via ->write_iter() bio_vec-backed iov_iter optimize copy_page_{to,from}_iter() bury generic_file_aio_{read,write} lustre: get rid of messing with iovecs ceph: switch to ->write_iter() ceph_sync_direct_write: stop poking into iov_iter guts ceph_sync_read: stop poking into iov_iter guts new helper: copy_page_from_iter() fuse: switch to ->write_iter() btrfs: switch to ->write_iter() ocfs2: switch to ->write_iter() xfs: switch to ->write_iter() ...
| * ->splice_write() via ->write_iter()Al Viro2014-06-121-1/+1
| | | | | | | | | | | | | | | | | | | | iter_file_splice_write() - a ->splice_write() instance that gathers the pipe buffers, builds a bio_vec-based iov_iter covering those and feeds it to ->write_iter(). A bunch of simple cases coverted to that... [AV: fixed the braino spotted by Cyrill] Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * ubifs: switch to ->write_iter()Al Viro2014-05-061-12/+7
| | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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