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* ext4: mext_insert_extents should update extent block checksumDarrick J. Wong2013-04-191-12/+1
| | | | | Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: defragmentation code cleanupDmitry Monakhov2013-04-111-2/+9
| | | | | | | | | | | | | | | | - grab_cache_page_write_begin() may not wait on page's writeback since (1d1d1a767206). But it is still reasonable to wait on page's writeback here in order to be on the safe side. - Fix miss typo: pass 'length' instead of 'end' to __block_write_begin() https://bugzilla.kernel.org/show_bug.cgi?id=56241 TESTCASE: git://oss.sgi.com/xfs/cmds/xfstests.git MKFS_OPTIONS="-b1024" ; ./check ext4/304 Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Reviewed-by: Akira Fujita <a-fujita.rs.jp.nec.com>
* ext4: fix usless declarationsDmitri Monakho2013-04-091-1/+0
| | | | | | | This patch should fix sparse complains about shadow declatations. Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: implementation of a new ioctl called EXT4_IOC_SWAP_BOOTDr. Tilmann Bubeck2013-04-081-23/+25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add a new ioctl, EXT4_IOC_SWAP_BOOT which swaps i_blocks and associated attributes (like i_blocks, i_size, i_flags, ...) from the specified inode with inode EXT4_BOOT_LOADER_INO (#5). This is typically used to store a boot loader in a secure part of the filesystem, where it can't be changed by a normal user by accident. The data blocks of the previous boot loader will be associated with the given inode. This usercode program is a simple example of the usage: int main(int argc, char *argv[]) { int fd; int err; if ( argc != 2 ) { printf("usage: ext4-swap-boot-inode FILE-TO-SWAP\n"); exit(1); } fd = open(argv[1], O_WRONLY); if ( fd < 0 ) { perror("open"); exit(1); } err = ioctl(fd, EXT4_IOC_SWAP_BOOT); if ( err < 0 ) { perror("ioctl"); exit(1); } close(fd); exit(0); } [ Modified by Theodore Ts'o to fix a number of bugs in the original code.] Signed-off-by: Dr. Tilmann Bubeck <t.bubeck@reinform.de> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* Merge tag 'ext4_for_linue' of ↵Linus Torvalds2013-03-211-16/+27
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 Pull ext4 fixes from Ted Ts'o: "Fix a number of regression and other bugs in ext4, most of which were relatively obscure cornercases or races that were found using regression tests." * tag 'ext4_for_linue' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: (21 commits) ext4: fix data=journal fast mount/umount hang ext4: fix ext4_evict_inode() racing against workqueue processing code ext4: fix memory leakage in mext_check_coverage ext4: use s_extent_max_zeroout_kb value as number of kb ext4: use atomic64_t for the per-flexbg free_clusters count jbd2: fix use after free in jbd2_journal_dirty_metadata() ext4: reserve metadata block for every delayed write ext4: update reserved space after the 'correction' ext4: do not use yield() ext4: remove unused variable in ext4_free_blocks() ext4: fix WARN_ON from ext4_releasepage() ext4: fix the wrong number of the allocated blocks in ext4_split_extent() ext4: update extent status tree after an extent is zeroed out ext4: fix wrong m_len value after unwritten extent conversion ext4: add self-testing infrastructure to do a sanity check ext4: avoid a potential overflow in ext4_es_can_be_merged() ext4: invalidate extent status tree during extent migration ext4: remove unnecessary wait for extent conversion in ext4_fallocate() ext4: add warning to ext4_convert_unwritten_extents_endio ext4: disable merging of uninitialized extents ...
| * ext4: fix memory leakage in mext_check_coverageDmitry Monakhov2013-03-181-16/+19
| | | | | | | | | | | | | | | | | | | | | | | | Regression was introduced by following commit 8c854473 TESTCASE (git://oss.sgi.com/xfs/cmds/xfstests.git): #while true;do ./check 301 || break ;done Also fix potential memory leakage in get_ext_path() once ext4_ext_find_extent() have failed. Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| * ext4: invalidate extent status tree during extent migrationDmitry Monakhov2013-03-041-0/+8
| | | | | | | | | | | | | | | | | | | | | | | | mext_replace_branches() will change inode's extents layout so we have to drop corresponding cache. TESTCASE: 301'th xfstest was not yet accepted to official xfstest's branch and can be found here: https://github.com/dmonakhov/xfstests/commit/7b7efeee30a41109201e2040034e71db9b66ddc0 Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Reviewed-by: Jan Kara <jack@suse.cz>
* | Merge branch 'for-linus' of ↵Linus Torvalds2013-02-261-3/+3
|\ \ | |/ |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull vfs pile (part one) from Al Viro: "Assorted stuff - cleaning namei.c up a bit, fixing ->d_name/->d_parent locking violations, etc. The most visible changes here are death of FS_REVAL_DOT (replaced with "has ->d_weak_revalidate()") and a new helper getting from struct file to inode. Some bits of preparation to xattr method interface changes. Misc patches by various people sent this cycle *and* ocfs2 fixes from several cycles ago that should've been upstream right then. PS: the next vfs pile will be xattr stuff." * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (46 commits) saner proc_get_inode() calling conventions proc: avoid extra pde_put() in proc_fill_super() fs: change return values from -EACCES to -EPERM fs/exec.c: make bprm_mm_init() static ocfs2/dlm: use GFP_ATOMIC inside a spin_lock ocfs2: fix possible use-after-free with AIO ocfs2: Fix oops in ocfs2_fast_symlink_readpage() code path get_empty_filp()/alloc_file() leave both ->f_pos and ->f_version zero target: writev() on single-element vector is pointless export kernel_write(), convert open-coded instances fs: encode_fh: return FILEID_INVALID if invalid fid_type kill f_vfsmnt vfs: kill FS_REVAL_DOT by adding a d_weak_revalidate dentry op nfsd: handle vfs_getattr errors in acl protocol switch vfs_getattr() to struct path default SET_PERSONALITY() in linux/elf.h ceph: prepopulate inodes only when request is aborted d_hash_and_lookup(): export, switch open-coded instances 9p: switch v9fs_set_create_acl() to inode+fid, do it before d_instantiate() 9p: split dropping the acls from v9fs_set_create_acl() ...
| * new helper: file_inode(file)Al Viro2013-02-221-3/+3
| | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* | ext4: remove single extent cacheZheng Liu2013-02-181-3/+0
| | | | | | | | | | | | | | | | | | Single extent cache could be removed because we have extent status tree as a extent cache, and it would be better. Signed-off-by: Zheng Liu <wenqing.lz@taobao.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Cc: Jan kara <jack@suse.cz>
* | ext4: pass context information to jbd2__journal_start()Theodore Ts'o2013-02-081-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | So we can better understand what bits of ext4 are responsible for long-running jbd2 handles, use jbd2__journal_start() so we can pass context information for logging purposes. The recommended way for finding the longer-running handles is: T=/sys/kernel/debug/tracing EVENT=$T/events/jbd2/jbd2_handle_stats echo "interval > 5" > $EVENT/filter echo 1 > $EVENT/enable ./run-my-fs-benchmark cat $T/trace > /tmp/problem-handles This will list handles that were active for longer than 20ms. Having longer-running handles is bad, because a commit started at the wrong time could stall for those 20+ milliseconds, which could delay an fsync() or an O_SYNC operation. Here is an example line from the trace file describing a handle which lived on for 311 jiffies, or over 1.2 seconds: postmark-2917 [000] .... 196.435786: jbd2_handle_stats: dev 254,32 tid 570 type 2 line_no 2541 interval 311 sync 0 requested_blocks 1 dirtied_blocks 0 Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* | ext4: fix smatch warning in move_extent.c's mext_replace_branches()Akria Fujita2013-02-011-1/+4
|/ | | | | | | | | | | | | | Commit 2147b1a6a48 resulted in a new smatch warning: > fs/ext4/move_extent.c:693 mext_replace_branches() > warn: variable dereferenced before check 'dext' (see line 683) Fix this by adding a check to make sure dext is non-NULL before we derefrence it. Signed-off-by: Akria Fujita <a-fujita@rs.jp.nec.com> [ modified by tytso to make sure an ext4_error is called ] Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: rationalize ext4_extents.h inclusionTheodore Ts'o2012-11-281-0/+1
| | | | | | | | | | | | | | | | | | | | | | Previously, ext4_extents.h was being included at the end of ext4.h, which was bad for a number of reasons: (a) it was not being included in the expected place, and (b) it caused the header to be included multiple times. There were #ifdef's to prevent this from causing any problems, but it still was unnecessary. By moving the function declarations that were in ext4_extents.h to ext4.h, which is standard practice for where the function declarations for the rest of ext4.h can be found, we can remove ext4_extents.h from being included in ext4.h at all, and then we can only include ext4_extents.h where it is needed in ext4's source files. It should be possible to move a few more things into ext4.h, and further reduce the number of source files that need to #include ext4_extents.h, but that's a cleanup for another day. Reported-by: Sachin Kamat <sachin.kamat@linaro.org> Reported-by: Wei Yongjun <weiyj.lk@gmail.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: serialize dio nonlocked reads with defrag workersDmitry Monakhov2012-09-291-0/+8
| | | | | | | | | | | | | Inode's block defrag and ext4_change_inode_journal_flag() may affect nonlocked DIO reads result, so proper synchronization required. - Add missed inode_dio_wait() calls where appropriate - Check inode state under extra i_dio_count reference. Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: convert to use leXX_add_cpu()Wei Yongjun2012-09-271-3/+2
| | | | | | | | | | Convert cpu_to_leXX(leXX_to_cpu(E1) + E2) to use leXX_add_cpu(). dpatch engine is used to auto generate this patch. (https://github.com/weiyj/dpatch) Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: remove redundant offset check in mext_check_arguments()Wang Sheng-Hui2012-09-271-1/+0
| | | | | | | | | In the check code above, if orig_start != donor_start, we would return -EINVAL. So here, orig_start should be equal with donor_start. Remove the redundant check here. Signed-off-by: Wang Sheng-Hui <shhuiw@gmail.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: reimplement uninit extent optimization for move_extent_per_page()Dmitry Monakhov2012-09-261-5/+76
| | | | | | | | | | | | Uninitialized extent may became initialized(parallel writeback task) at any moment after we drop i_data_sem, so we have to recheck extent's state after we hold page's lock and i_data_sem. If we about to change page's mapping we must hold page's lock in order to serialize other users. Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: clean up online defrag bugs in move_extent_per_page()Dmitry Monakhov2012-09-261-75/+178
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Non-full list of bugs: 1) uninitialized extent optimization does not hold page's lock, and simply replace brunches after that writeback code goes crazy because block mapping changed under it's feets kernel BUG at fs/ext4/inode.c:1434! ( 288'th xfstress) 2) uninitialized extent may became initialized right after we drop i_data_sem, so extent state must be rechecked 3) Locked pages goes uptodate via following sequence: ->readpage(page); lock_page(page); use_that_page(page) But after readpage() one may invalidate it because it is uptodate and unlocked (reclaimer does that) As result kernel bug at include/linux/buffer_head.c:133! 4) We call write_begin() with already opened stansaction which result in following deadlock: ->move_extent_per_page() ->ext4_journal_start()-> hold journal transaction ->write_begin() ->ext4_da_write_begin() ->ext4_nonda_switch() ->writeback_inodes_sb_if_idle() --> will wait for journal_stop() 5) try_to_release_page() may fail and it does fail if one of page's bh was pinned by journal 6) If we about to change page's mapping we MUST hold it's lock during entire remapping procedure, this is true for both pages(original and donor one) Fixes: - Avoid (1) and (2) simply by temproraly drop uninitialized extent handling optimization, this will be reimplemented later. - Fix (3) by manually forcing page to uptodate state w/o dropping it's lock - Fix (4) by rearranging existing locking: from: journal_start(); ->write_begin to: write_begin(); journal_extend() - Fix (5) simply by checking retvalue - Fix (6) by locking both (original and donor one) pages during extent swap with help of mext_page_double_lock() Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: online defrag is not supported for journaled filesDmitry Monakhov2012-09-261-1/+6
| | | | | | | | | | Proper block swap for inodes with full journaling enabled is truly non obvious task. In order to be on a safe side let's explicitly disable it for now. Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Cc: stable@vger.kernel.org
* ext4: move_extent code cleanupDmitry Monakhov2012-09-261-120/+47
| | | | | | | | | | | | | - Remove usless checks, because it is too late to check that inode != NULL at the moment it was referenced several times. - Double lock routines looks very ugly and locking ordering relays on order of i_ino, but other kernel code rely on order of pointers. Let's make them simple and clean. - check that inodes belongs to the same SB as soon as possible. Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Cc: stable@vger.kernel.org
* ext4: add some tracepoints in ext4/extents.cAditya Kali2011-09-091-1/+0
| | | | | | | | | | | | | This patch adds some tracepoints in ext4/extents.c and updates a tracepoint in ext4/inode.c. Tested: Built and ran the kernel and verified that these tracepoints work. Also ran xfstests. Signed-off-by: Aditya Kali <adityakali@google.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: Fix max file size and logical block counting of extent format fileLukas Czerner2011-06-061-5/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Kazuya Mio reported that he was able to hit BUG_ON(next == lblock) in ext4_ext_put_gap_in_cache() while creating a sparse file in extent format and fill the tail of file up to its end. We will hit the BUG_ON when we write the last block (2^32-1) into the sparse file. The root cause of the problem lies in the fact that we specifically set s_maxbytes so that block at s_maxbytes fit into on-disk extent format, which is 32 bit long. However, we are not storing start and end block number, but rather start block number and length in blocks. It means that in order to cover extent from 0 to EXT_MAX_BLOCK we need EXT_MAX_BLOCK+1 to fit into len (because we counting block 0 as well) - and it does not. The only way to fix it without changing the meaning of the struct ext4_extent members is, as Kazuya Mio suggested, to lower s_maxbytes by one fs block so we can cover the whole extent we can get by the on-disk extent format. Also in many places EXT_MAX_BLOCK is used as length instead of maximum logical block number as the name suggests, it is all a bit messy. So this commit renames it to EXT_MAX_BLOCKS and change its usage in some places to actually be maximum number of blocks in the extent. The bug which this commit fixes can be reproduced as follows: dd if=/dev/zero of=/mnt/mp1/file bs=<blocksize> count=1 seek=$((2**32-2)) sync dd if=/dev/zero of=/mnt/mp1/file bs=<blocksize> count=1 seek=$((2**32-1)) Reported-by: Kazuya Mio <k-mio@sx.jp.nec.com> Signed-off-by: Lukas Czerner <lczerner@redhat.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: clean up some wait_on_page_writeback callsDarrick J. Wong2011-05-181-2/+1
| | | | | | | | wait_on_page_writeback already checks the writeback bit, so callers of it needn't do that test. Signed-off-by: Darrick J. Wong <djwong@us.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: rename {ext,idx}_pblock and inline small extent functionsTheodore Ts'o2010-10-271-11/+11
| | | | | | | | | Cleanup namespace leaks from fs/ext4 and the inline trivial functions ext4_{ext,idx}_pblock() and ext4_{ext,idx}_store_pblock() since the code size actually shrinks when we make these functions inline, they're so trivial. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: Pass line numbers to ext4_error() and friendsTheodore Ts'o2010-07-271-5/+5
| | | | Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: Make sure the MOVE_EXT ioctl can't overwrite append-only filesTheodore Ts'o2010-06-021-0/+3
| | | | | | | | | | Dan Roseberg has reported a problem with the MOVE_EXT ioctl. If the donor file is an append-only file, we should not allow the operation to proceed, lest we end up overwriting the contents of an append-only file. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Cc: Dan Rosenberg <dan.j.rosenberg@gmail.com>
* ext4: Use bitops to read/modify i_flags in struct ext4_inode_infoDmitry Monakhov2010-05-161-2/+2
| | | | | | | | | | | | At several places we modify EXT4_I(inode)->i_flags without holding i_mutex (ext4_do_update_inode, ...). These modifications are racy and we can lose updates to i_flags. So convert handling of i_flags to use bitops which are atomic. https://bugzilla.kernel.org/show_bug.cgi?id=15792 Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: Convert calls of ext4_error() to EXT4_ERROR_INODE()Theodore Ts'o2010-05-161-4/+4
| | | | | | | | | | EXT4_ERROR_INODE() tends to provide better error information and in a more consistent format. Some errors were not even identifying the inode or directory which was corrupted, which made them not very useful. Addresses-Google-Bug: #2507977 Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: Fix coding style in fs/ext4/move_extent.cSteven Liu2010-05-111-0/+1
| | | | | | | | | | | | | | | | Making sure ee_block is initialized to zero to prevent gcc from kvetching. It's harmless (although it's not obvious that it's harmless) from code inspection: fs/ext4/move_extent.c:478: warning: 'start_ext.ee_block' may be used uninitialized in this function Thanks to Stefan Richter for first bringing this to the attention of linux-ext4@vger.kernel.org. Signed-off-by: LiuQi <lingjiujianke@gmail.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Cc: Stefan Richter <stefanr@s5r6.in-berlin.de>
* include cleanup: Update gfp.h and slab.h includes to prepare for breaking ↵Tejun Heo2010-03-301-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
* ext4: Code cleanup for EXT4_IOC_MOVE_EXT ioctlAkira Fujita2010-03-041-3/+1
| | | | | | | | | a) Fix sparse warning in ext4_ioctl() b) Remove unneeded variable in mext_leaf_block() c) Fix spelling typo in mext_check_arguments() Signed-off-by: Akira Fujita <a-fujita@rs.jp.nec.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: Fix the NULL reference in double_down_write_data_sem()Akira Fujita2010-03-041-8/+8
| | | | | | | | | If EXT4_IOC_MOVE_EXT ioctl is called with NULL donor_fd, fget() in ext4_ioctl() gets inappropriate file structure for donor; so we need to do this check earlier, before calling double_down_write_data_sem(). Signed-off-by: Akira Fujita <a-fujita@rs.jp.nec.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: Fix insertion point of extent in mext_insert_across_blocks()Akira Fujita2010-03-041-0/+4
| | | | | | | | | | | If the leaf node has 2 extent space or fewer and EXT4_IOC_MOVE_EXT ioctl is called with the file offset where after the 2nd extent covers, mext_insert_across_blocks() always tries to insert extent into the first extent. As a result, the file gets corrupted because of wrong extent order. The patch fixes this problem. Signed-off-by: Akira Fujita <a-fujita@rs.jp.nec.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: move __func__ into a macro for ext4_warning, ext4_errorEric Sandeen2010-02-151-6/+6
| | | | | | | | | | | Just a pet peeve of mine; we had a mishash of calls with either __func__ or "function_name" and the latter tends to get out of sync. I think it's easier to just hide the __func__ in a macro, and it'll be consistent from then on. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: Fix insufficient checks in EXT4_IOC_MOVE_EXTAkira Fujita2009-12-061-0/+7
| | | | | | | | | | | | | | | | | | | This patch fixes three problems in the handling of the EXT4_IOC_MOVE_EXT ioctl: 1. In current EXT4_IOC_MOVE_EXT, there are read access mode checks for original and donor files, but they allow the illegal write access to donor file, since donor file is overwritten by original file data. To fix this problem, change access mode checks of original (r->r/w) and donor (r->w) files. 2. Disallow the use of donor files that have a setuid or setgid bits. 3. Call mnt_want_write() and mnt_drop_write() before and after ext4_move_extents() calling to get write access to a mount. Signed-off-by: Akira Fujita <a-fujita@rs.jp.nec.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: move_extent_per_page() cleanupAkira Fujita2009-11-241-21/+9
| | | | | | | | | Integrate duplicate lines (acquire/release semaphore and invalidate extent cache in move_extent_per_page()) into mext_replace_branches(), to reduce source and object code size. Signed-off-by: Akira Fujita <a-fujita@rs.jp.nec.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: initialize moved_len before calling ext4_move_extents()Kazuya Mio2009-11-241-11/+3
| | | | | | | | | | | | The move_extent.moved_len is used to pass back the number of exchanged blocks count to user space. Currently the caller must clear this field; but we spend more code space checking for this requirement than simply zeroing the field ourselves, so let's just make life easier for everyone all around. Signed-off-by: Kazuya Mio <k-mio@sx.jp.nec.com> Signed-off-by: Akira Fujita <a-fujita@rs.jp.nec.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: Fix double-free of blocks with EXT4_IOC_MOVE_EXTAkira Fujita2009-11-241-4/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | At the beginning of ext4_move_extent(), we call ext4_discard_preallocations() to discard inode PAs of orig and donor inodes. But in the following case, blocks can be double freed, so move ext4_discard_preallocations() to the end of ext4_move_extents(). 1. Discard inode PAs of orig and donor inodes with ext4_discard_preallocations() in ext4_move_extents(). orig : [ DATA1 ] donor: [ DATA2 ] 2. While data blocks are exchanging between orig and donor inodes, new inode PAs is created to orig by other process's block allocation. (Since there are semaphore gaps in ext4_move_extents().) And new inode PAs is used partially (2-1). 2-1 Create new inode PAs to orig inode orig : [ DATA1 | used PA1 | free PA1 ] donor: [ DATA2 ] 3. Donor inode which has old orig inode's blocks is deleted after EXT4_IOC_MOVE_EXT finished (3-1, 3-2). So the block bitmap corresponds to old orig inode's blocks are freed. 3-1 After EXT4_IOC_MOVE_EXT finished orig : [ DATA2 | free PA1 ] donor: [ DATA1 | used PA1 ] 3-2 Delete donor inode orig : [ DATA2 | free PA1 ] donor: [ FREE SPACE(DATA1) | FREE SPACE(used PA1) ] 4. The double-free of blocks is occurred, when close() is called to orig inode. Because ext4_discard_preallocations() for orig inode frees used PA1 and free PA1, though used PA1 is already freed in 3. 4-1 Double-free of blocks is occurred orig : [ DATA2 | FREE SPACE(free PA1) ] donor: [ FREE SPACE(DATA1) | DOUBLE FREE(used PA1) ] Signed-off-by: Akira Fujita <a-fujita@rs.jp.nec.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: fix spelling typos in move_extent.cAkira Fujita2009-11-231-2/+2
| | | | | | | Fix a few spelling typos in move_extent.c Signed-off-by: Akira Fujita <a-fujita@rs.jp.nec.co.jp> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: fix possible recursive locking warning in EXT4_IOC_MOVE_EXTAkira Fujita2009-11-231-1/+1
| | | | | | | | | | | | | | | | If CONFIG_PROVE_LOCKING is enabled, the double_down_write_data_sem() will trigger a false-positive warning of a recursive lock. Since we take i_data_sem for the two inodes ordered by their inode numbers, this isn't a problem. Use of down_write_nested() will notify the lock dependency checker machinery that there is no problem here. This problem was reported by Brian Rogers: http://marc.info/?l=linux-ext4&m=125115356928011&w=1 Reported-by: Brian Rogers <brian@xyzw.org> Signed-off-by: Akira Fujita <a-fujita@rs.jp.nec.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: fix lock order problem in ext4_move_extents()Akira Fujita2009-11-231-64/+53
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | ext4_move_extents() checks the logical block contiguousness of original file with ext4_find_extent() and mext_next_extent(). Therefore the extent which ext4_ext_path structure indicates must not be changed between above functions. But in current implementation, there is no i_data_sem protection between ext4_ext_find_extent() and mext_next_extent(). So the extent which ext4_ext_path structure indicates may be overwritten by delalloc. As a result, ext4_move_extents() will exchange wrong blocks between original and donor files. I change the place where acquire/release i_data_sem to solve this problem. Moreover, I changed move_extent_per_page() to start transaction first, and then acquire i_data_sem. Without this change, there is a possibility of the deadlock between mmap() and ext4_move_extents(): * NOTE: "A", "B" and "C" mean different processes A-1: ext4_ext_move_extents() acquires i_data_sem of two inodes. B: do_page_fault() starts the transaction (T), and then tries to acquire i_data_sem. But process "A" is already holding it, so it is kept waiting. C: While "A" and "B" running, kjournald2 tries to commit transaction (T) but it is under updating, so kjournald2 waits for it. A-2: Call ext4_journal_start with holding i_data_sem, but transaction (T) is locked. Signed-off-by: Akira Fujita <a-fujita@rs.jp.nec.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: fix the returned block count if EXT4_IOC_MOVE_EXT failsAkira Fujita2009-11-231-66/+73
| | | | | | | | | | | | If the EXT4_IOC_MOVE_EXT ioctl fails, the number of blocks that were exchanged before the failure should be returned to the userspace caller. Unfortunately, currently if the block size is not the same as the page size, the returned block count that is returned is the page-aligned block count instead of the actual block count. This commit addresses this bug. Signed-off-by: Akira Fujita <a-fujita@rs.jp.nec.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: EXT4_IOC_MOVE_EXT: Check for different original and donor inodes firstTheodore Ts'o2009-09-281-8/+8
| | | | | | | | Move the check to make sure the original and donor inodes are different earlier, to avoid a potential deadlock by trying to lock the same inode twice. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: Split uninitialized extents for direct I/OMingming Cao2009-09-281-2/+2
| | | | | | | | | | | | | When writing into an unitialized extent via direct I/O, and the direct I/O doesn't exactly cover the unitialized extent, split the extent into uninitialized and initialized extents before submitting the I/O. This avoids needing to deal with an ENOSPC error in the end_io callback that gets used for direct I/O. When the IO is complete, the written extent will be marked as initialized. Singed-Off-By: Mingming Cao <cmm@us.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: replace MAX_DEFRAG_SIZE with EXT_MAX_BLOCKEric Sandeen2009-09-171-6/+6
| | | | | | | | | There's no reason to redefine the maximum allowable offset in an extent-based file just for defrag; EXT_MAX_BLOCK already does this. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: Fix different block exchange issue in EXT4_IOC_MOVE_EXTAkira Fujita2009-09-161-9/+37
| | | | | | | | | | | | | | | If logical block offset of original file which is passed to EXT4_IOC_MOVE_EXT is different from donor file's, a calculation error occurs in ext4_calc_swap_extents(), therefore wrong block is exchanged between original file and donor file. As a result, we hit ext4_error() in check_block_validity(). To detect the logical offset difference in EXT4_IOC_MOVE_EXT, add checks to mext_calc_swap_extents() and handle it as error, since data exchange must be done between the same blocks in EXT4_IOC_MOVE_EXT. Reported-by: Peng Tao <bergwolf@gmail.com> Signed-off-by: Akira Fujita <a-fujita@rs.jp.nec.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: Add null extent check to ext_get_pathAkira Fujita2009-09-161-18/+16
| | | | | | | | | | | | | There is the possibility that path structure which is taken by ext4_ext_find_extent() indicates null extents. Because during data block exchanging in ext4_move_extents(), constitution of an extent tree may be changed. As a solution, the patch adds null extent check to ext_get_path(). Reported-by: Peng Tao <bergwolf@gmail.com> Signed-off-by: Akira Fujita <a-fujita@rs.jp.nec.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: Replace BUG_ON() with ext4_error() in move_extents.cAkira Fujita2009-09-161-40/+109
| | | | | | | | | | Replace BUG_ON calls with a call to ext4_error() to print an error message if EXT4_IOC_MOVE_EXT failed with some kind of reasons. This will help to debug. Ted pointed this out, thanks. Signed-off-by: Akira Fujita <a-fujita@rs.jp.nec.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: Replace get_ext_path macro with an inline funcitonAkira Fujita2009-09-161-21/+34
| | | | | | | | | Replace get_ext_path macro with an inline function, since this macro looks like a function call but its arguments get modified. Ted pointed this out, thanks. Signed-off-by: Akira Fujita <a-fujita@rs.jp.nec.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: Fix small typo for move_extent_per_page()Akira Fujita2009-09-051-2/+2
| | | | | | | | This function means moving extents every page, so change its name from move_exgtent_par_page(). Signed-off-by: Akira Fujita <a-fujita@rs.jp.nec.co.jp> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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