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* Merge branch 'for_linus' of ↵Linus Torvalds2009-09-18
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 * 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: (64 commits) ext4: Update documentation about quota mount options ext4: replace MAX_DEFRAG_SIZE with EXT_MAX_BLOCK ext4: Fix the alloc on close after a truncate hueristic ext4: Add a tracepoint for ext4_alloc_da_blocks() ext4: store EXT4_EXT_MIGRATE in i_state instead of i_flags ext4: limit block allocations for indirect-block files to < 2^32 ext4: Fix different block exchange issue in EXT4_IOC_MOVE_EXT ext4: Add null extent check to ext_get_path ext4: Replace BUG_ON() with ext4_error() in move_extents.c ext4: Replace get_ext_path macro with an inline funciton ext4: Fix include/trace/events/ext4.h to work with Systemtap ext4: Fix initalization of s_flex_groups ext4: Always set dx_node's fake_dirent explicitly. ext4: Fix async commit mode to be safe by using a barrier ext4: Don't update superblock write time when filesystem is read-only ext4: Clarify the locking details in mballoc ext4: check for need init flag in ext4_mb_load_buddy ext4: move ext4_mb_init_group() function earlier in the mballoc.c ext4: Make non-journal fsync work properly ext4: Assure that metadata blocks are written during fsync in no journal mode ...
| * ext4: replace MAX_DEFRAG_SIZE with EXT_MAX_BLOCKEric Sandeen2009-09-17
| | | | | | | | | | | | | | | | | | 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 the alloc on close after a truncate hueristicTheodore Ts'o2009-09-17
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In an attempt to avoid doing an unneeded flush after opening a (previously non-existent) file with O_CREAT|O_TRUNC, the code only triggered the hueristic if ei->disksize was non-zero. Turns out that the VFS doesn't call ->truncate() if the file doesn't exist, and ei->disksize is always zero even if the file previously existed. So remove the test, since it isn't necessary and in fact disabled the hueristic. Thanks to Clemens Eisserer that he was seeing problems with files written using kwrite and eclipse after sudden crashes caused by a buggy Intel video driver. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| * ext4: Add a tracepoint for ext4_alloc_da_blocks()Theodore Ts'o2009-09-16
| | | | | | | | Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| * ext4: store EXT4_EXT_MIGRATE in i_state instead of i_flagsTheodore Ts'o2009-09-17
| | | | | | | | | | | | | | | | | | | | | | EXT4_EXT_MIGRATE is only intended to be used for an in-memory flag, and the hex value assigned to it collides with FS_DIRECTIO_FL (which is also stored in i_flags). There's no reason for the EXT4_EXT_MIGRATE bit to be stored in i_flags, so we switch it to use i_state instead. Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| * ext4: limit block allocations for indirect-block files to < 2^32Eric Sandeen2009-09-16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Today, the ext4 allocator will happily allocate blocks past 2^32 for indirect-block files, which results in the block numbers getting truncated, and corruption ensues. This patch limits such allocations to < 2^32, and adds BUG_ONs if we do get blocks larger than that. This should address RH Bug 519471, ext4 bitmap allocator must limit blocks to < 2^32 * ext4_find_goal() is modified to choose a goal < UINT_MAX, so that our starting point is in an acceptable range. * ext4_xattr_block_set() is modified such that the goal block is < UINT_MAX, as above. * ext4_mb_regular_allocator() is modified so that the group search does not continue into groups which are too high * ext4_mb_use_preallocated() has a check that we don't use preallocated space which is too far out * ext4_alloc_blocks() and ext4_xattr_block_set() add some BUG_ONs No attempt has been made to limit inode locations to < 2^32, so we may wind up with blocks far from their inodes. Doing this much already will lead to some odd ENOSPC issues when the "lower 32" gets full, and further restricting inodes could make that even weirder. For high inodes, choosing a goal of the original, % UINT_MAX, may be a bit odd, but then we're in an odd situation anyway, and I don't know of a better heuristic. 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 Fujita2009-09-16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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 Fujita2009-09-16
| | | | | | | | | | | | | | | | | | | | | | | | | | 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 Fujita2009-09-16
| | | | | | | | | | | | | | | | | | | | 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 Fujita2009-09-16
| | | | | | | | | | | | | | | | | | 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 include/trace/events/ext4.h to work with SystemtapTheodore Ts'o2009-09-14
| | | | | | | | | | | | | | | | | | | | | | | | | | Using relative pathnames in #include statements interacts badly with SystemTap, since the fs/ext4/*.h header files are not packaged up as part of a distribution kernel's header files. Since systemtap doesn't use TP_fast_assign(), we can use a blind structure definition and then make sure the needed header files are defined before the ext4 source files #include the trace/events/ext4.h header file. https://bugzilla.redhat.com/show_bug.cgi?id=512478 Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| * ext4: Fix initalization of s_flex_groupsTheodore Ts'o2009-09-11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | The s_flex_groups array should have been initialized using atomic_add to sum up the free counts from the block groups that make up a flex_bg. By using atomic_set, the value of the s_flex_groups array was set to the values of the last block group in the flex_bg. The impact of this bug is that the block and inode allocation algorithms might not pick the best flex_bg for new allocation. Thanks to Damien Guibouret for pointing out this problem! Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| * ext4: Always set dx_node's fake_dirent explicitly.Andreas Schlick2009-09-10
| | | | | | | | | | | | | | | | | | | | When ext4_dx_add_entry() has to split an index node, it has to ensure that name_len of dx_node's fake_dirent is also zero, because otherwise e2fsck won't recognise it as an intermediate htree node and consider the htree to be corrupted. Signed-off-by: Andreas Schlick <schlick@lavabit.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| * ext4: Fix async commit mode to be safe by using a barrierTheodore Ts'o2009-09-11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Previously the journal_async_commit mount option was equivalent to using barrier=0 (and just as unsafe). This patch fixes it so that we eliminate the barrier before the commit block (by not using ordered mode), and explicitly issuing an empty barrier bio after writing the commit block. Because of the journal checksum, it is safe to do this; if the journal blocks are not all written before a power failure, the checksum in the commit block will prevent the last transaction from being replayed. Using the fs_mark benchmark, using journal_async_commit shows a 50% improvement: FSUse% Count Size Files/sec App Overhead 8 1000 10240 30.5 28242 vs. FSUse% Count Size Files/sec App Overhead 8 1000 10240 45.8 28620 Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| * ext4: Don't update superblock write time when filesystem is read-onlyTheodore Ts'o2009-09-10
| | | | | | | | | | | | | | | | | | | | | | This avoids updating the superblock write time when we are mounting the root file system read/only but we need to replay the journal; at that point, for people who are east of GMT and who make their clock tick in localtime for Windows bug-for-bug compatibility, and this will cause e2fsck to complain and force a full file system check. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| * ext4: Clarify the locking details in mballocAneesh Kumar K.V2009-09-09
| | | | | | | | | | | | | | | | | | We don't need to take the alloc_sem lock when we are adding new groups, since mballoc won't see the new group added until we bump sbi->s_groups_count. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
| * ext4: check for need init flag in ext4_mb_load_buddyAneesh Kumar K.V2009-09-09
| | | | | | | | | | | | | | | | | | | | | | | | | | We should check for need init flag with the group's alloc_sem held, to make sure while we are loading the buddy cache and holding a reference to it, a file system resize can't add new blocks to same group. The patch also drops the need init flag check in ext4_mb_regular_allocator() because doing the check without holding alloc_sem is racy. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
| * ext4: move ext4_mb_init_group() function earlier in the mballoc.cAneesh Kumar K.V2009-09-09
| | | | | | | | | | | | | | | | This moves the function around so that it can be called from ext4_mb_load_buddy(). Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| * ext4: Make non-journal fsync work properlyFrank Mayhar2009-09-09
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Teach ext4_write_inode() and ext4_do_update_inode() about non-journal mode: If we're not using a journal, ext4_write_inode() now calls ext4_do_update_inode() (after getting the iloc via ext4_get_inode_loc()) with a new "do_sync" parameter. If that parameter is nonzero _and_ we're not using a journal, ext4_do_update_inode() calls sync_dirty_buffer() instead of ext4_handle_dirty_metadata(). This problem was found in power-fail testing, checking the amount of loss of files and blocks after a power failure when using fsync() and when not using fsync(). It turned out that using fsync() was actually worse than not doing so, possibly because it increased the likelihood that the inodes would remain unflushed and would therefore be lost at the power failure. Signed-off-by: Frank Mayhar <fmayhar@google.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| * ext4: Assure that metadata blocks are written during fsync in no journal modeTheodore Ts'o2009-09-12
| | | | | | | | | | | | | | | | | | | | | | When there is no journal present, we must attach buffer heads associated with extent tree and indirect blocks to the inode's mapping->private_list via mark_buffer_dirty_inode() so that ext4_sync_file() --- which is called to service fsync() and fdatasync() system calls --- can write out the inode's metadata blocks by calling sync_mapping_buffers(). Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| * ext4: Use bforget() in no journal mode for ext4_journal_{forget,revoke}()Theodore Ts'o2009-09-09
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When ext4 is using a journal, a metadata block which is deallocated must be passed into the journal layer so it can be dropped from the current transaction and/or revoked. This is done by calling the functions ext4_journal_forget() and ext4_journal_revoke(), which call jbd2_journal_forget(), and jbd2_journal_revoke(), respectively. Since the jbd2_journal_forget() and jbd2_journal_revoke() call bforget(), if ext4 is not using a journal, ext4_journal_forget() and ext4_journal_revoke() must call bforget() to avoid a dirty metadata block overwriting a block after it has been reallocated and reused for another inode's data block. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| * ext4: print more sysadmin-friendly message in check_block_validity()Theodore Ts'o2009-09-08
| | | | | | | | | | | | | | | | | | | | Drop the WARN_ON(1), as he stack trace is not appropriate, since it is triggered by file system corruption, and it misleads users into thinking there is a kernel bug. In addition, change the message displayed by ext4_error() to make it clear that this is a file system corruption problem. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| * ext4: Take page lock before looking at attached buffer_heads flagsAneesh Kumar K.V2009-09-09
| | | | | | | | | | | | | | | | In order to check whether the buffer_heads are mapped we need to hold page lock. Otherwise a reclaim can cleanup the attached buffer_heads. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| * ext4: Fix small typo for move_extent_per_page()Akira Fujita2009-09-05
| | | | | | | | | | | | | | | | 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>
| * ext4: Return exchanged blocks count to user space in failureAkira Fujita2009-09-05
| | | | | | | | | | | | | | | | Return exchanged blocks count (moved_len) to user space, if ext4_move_extents() failed on the way. Signed-off-by: Akira Fujita <a-fujita@rs.jp.nec.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| * ext4: Remove unneeded BUG_ON() in ext4_move_extents()Akira Fujita2009-09-05
| | | | | | | | | | | | | | | | | | | | | | | | The ext4_move_extents() functions checks with BUG_ON() whether the exchanged blocks count accords with request blocks count. But, if the target range (orig_start + len) includes sparse block(s), 'moved_len' (exchanged blocks count) does not agree with 'len' (request blocks count), since sparse block is not counted in 'moved_len'. This causes us to hit the BUG_ON(), even though the function succeeded. Signed-off-by: Akira Fujita <a-fujita@rs.jp.nec.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| * ext4: Fix wrong comparisons in mext_check_arguments()Akira Fujita2009-09-16
| | | | | | | | | | | | | | | | | | | | | | | | The mext_check_arguments() function in move_extents.c has wrong comparisons. orig_start which is passed from user-space is block unit, but i_size of inode is byte unit, therefore the checks do not work fine. This mis-check leads to the overflow of 'len' and then hits BUG_ON() in ext4_move_extents(). The patch fixes this issue. Signed-off-by: Akira Fujita <a-fujita@rs.jp.nec.com> Reviewed-by: Greg Freemyer <greg.freemyer@gmail.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| * ext4: fix cache flush in ext4_sync_fileChristoph Hellwig2009-09-05
| | | | | | | | | | | | | | | | | | | | | | | | | | We need to flush the write cache unconditionally in ->fsync, otherwise writes into already allocated blocks can get lost. Writes into fully allocated files are very common when using disk images for virtualization, and without this fix can easily lose data after an fdatasync, which is the typical implementation for a cache flush on the virtual drive. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| * ext4: Remove journal_checksum mount option and enable it by defaultTheodore Ts'o2009-09-05
| | | | | | | | | | | | | | | | | | There's no real cost for the journal checksum feature, and we should make sure it is enabled all the time. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| * ext4: Declare seq_operations and file_operations structures as constTobias Klauser2009-09-05
| | | | | | | | | | Signed-off-by: Tobias Klauser <tklauser@distanz.ch> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| * ext4: Add new tracepoint: trace_ext4_da_write_pages()Theodore Ts'o2009-08-31
| | | | | | | | | | | | | | Add a new tracepoint which shows the pages that will be written using write_cache_pages() by ext4_da_writepages(). Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| * ext4: Restore wbc->range_start in ext4_da_writepages()Theodore Ts'o2009-08-31
| | | | | | | | | | | | | | | | | | | | | | | | | | To solve a lock inversion problem, we implement part of the range_cyclic algorithm in ext4_da_writepages(). (See commit 2acf2c26 for more details.) As part of that change wbc->range_start was modified by ext4's writepages function, which causes its callers to get confused since they aren't expecting the filesystem to modify it. The simplest fix is to save and restore wbc->range_start in ext4_da_writepages. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| * ext4: Limit number of links that can be created by ext4_link()Theodore Ts'o2009-08-29
| | | | | | | | | | | | | | | | In ext4_link we need to check using EXT4_LINK_MAX, and not EXT4_DIR_LINK_MAX(), since ext4_link() is creating hard links of regular files, and not directories. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| * ext4: Allow rename to create more than EXT4_LINK_MAX subdirectoriesAneesh Kumar K.V2009-08-28
| | | | | | | | | | | | | | | | Use EXT4_DIR_LINK_MAX so that rename() can move a directory into new parent directory without running into the EXT4_LINK_MAX limit. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| * ext4: fix extent sanity checking code with AGGRESSIVE_TESTTheodore Ts'o2009-08-28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The extents sanity-checking code depends on the ext4_ext_space_*() functions returning the maximum alloable size for eh_max; however, when the debugging #ifdef AGGRESSIVE_TEST is enabled to test the extent tree handling code, this prevents a normally created ext4 filesystem from being mounted with the errors: Aug 26 15:43:50 bsd086 kernel: [ 96.070277] EXT4-fs error (device sda8): ext4_ext_check_inode: bad header/extent in inode #8: too large eh_max - magic f30a, entries 1, max 4(3), depth 0(0) Aug 26 15:43:50 bsd086 kernel: [ 96.070526] EXT4-fs (sda8): no journal found Bug reported by Akira Fujita. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| * ext4: use ext4_grpblk_t more extensivelyEric Sandeen2009-08-25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | unsigned short is potentially too small to track blocks within a group; today it is safe due to restrictions in e2fsprogs but we have _lo / _hi bits for group blocks with the intent to go up to 32 bits, so clean this up now. There are many more places where we use unsigned/int/unsigned int to contain a group block but this should at least fix all the short types. I added a few comments to the struct ext4_group_info definition as well. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| * ext4: use variables not types in sizeofs() for allocationsEric Sandeen2009-08-25
| | | | | | | | | | | | | | | | | | Precursor to changing some types; to keep things in sync, it seems better to allocate/memset based on the size of the variables we are using rather than on some disconnected basic type like "unsigned short" Signed-off-by: Eric Sandeen <sandeen@redhat.com>
| * ext4: Add missing unlock_new_inode() call in extent migration codeAneesh Kumar K.V2009-08-25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We need to unlock the new inode before iput. This patch fixes the following warning when calling chattr +e to migrate a file to use extents. It also fixes problems in when e4defrag attempts to defragment an inode. [ 470.400044] ------------[ cut here ]------------ [ 470.400065] WARNING: at fs/inode.c:1210 generic_delete_inode+0x65/0x16a() [ 470.400072] Hardware name: N/A ..... ... [ 470.400353] Pid: 4451, comm: chattr Not tainted 2.6.31-rc7-red-debug #4 [ 470.400359] Call Trace: [ 470.400372] [<ffffffff81037771>] warn_slowpath_common+0x77/0x8f [ 470.400385] [<ffffffff81037798>] warn_slowpath_null+0xf/0x11 [ 470.400395] [<ffffffff810b7f28>] generic_delete_inode+0x65/0x16a [ 470.400405] [<ffffffff810b8044>] generic_drop_inode+0x17/0x1bd [ 470.400413] [<ffffffff810b7083>] iput+0x61/0x65 [ 470.400455] [<ffffffffa003b229>] ext4_ext_migrate+0x5eb/0x66a [ext4] [ 470.400492] [<ffffffffa002b1f8>] ext4_ioctl+0x340/0x756 [ext4] [ 470.400507] [<ffffffff810b1a91>] vfs_ioctl+0x1d/0x82 [ 470.400517] [<ffffffff810b1ff0>] do_vfs_ioctl+0x483/0x4c9 [ 470.400527] [<ffffffff81059c30>] ? trace_hardirqs_on+0xd/0xf [ 470.400537] [<ffffffff810b2087>] sys_ioctl+0x51/0x74 [ 470.400549] [<ffffffff8100ba6b>] system_call_fastpath+0x16/0x1b [ 470.400557] ---[ end trace ab85723542352dac ]--- Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| * ext4: Add feature set check helper for mount & remount pathsEric Sandeen2009-08-18
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | A user reported that although his root ext4 filesystem was mounting fine, other filesystems would not mount, with the: "Filesystem with huge files cannot be mounted RDWR without CONFIG_LBDAF" error on his 32-bit box built without CONFIG_LBDAF. This is because the test at mount time for this situation was not being re-checked on remount, and the normal boot process makes an ro->rw transition, so this was being missed. Refactor to make a common helper function to test the filesystem features against the type of mount request (RO vs. RW) so that we stay consistent. Addresses Red-Hat-Bugzilla: #517650 Signed-off-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| * simplify some logic in ext4_mb_normalize_requestEric Sandeen2009-08-17
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | While reading through some of the mballoc code it seems that a couple spots in the size normalization function could be streamlined. The test for non-overlapping PAs can be or'd for the start & end conditions, and the tests for adjacent PAs can be else-if'd - it's essentially independently testing: if (A + B <= C) ... if (A > C) ... These cannot both be true so it seems like the else-if might be slightly more efficient and/or informative. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| * ext4: open-code ext4_mb_update_group_infoEric Sandeen2009-08-17
| | | | | | | | | | | | | | | | | | | | | | | | | | | | ext4_mb_update_group_info is only called in one place, and it's extremely simple. There's no reason to have it in a separate function in a separate file as far as I can tell, it just obfuscates what's really going on. Perhaps it was intended to keep the grp->bb_* manipulation local to mballoc.c but we're already accessing other grp-> fields in balloc.c directly so this seems ok. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| * ext4: reject too-large filesystems on 32-bit kernelsEric Sandeen2009-08-17
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | ext4 will happily mount a > 16T filesystem on a 32-bit box, but this is not safe; writes to the block device will wrap past 16T and the page cache can't index past 16T (232 index * 4k pages). Adding another test to the existing "too many sectors" test should do the trick. Add a comment, a relevant return value, and fix the reference to the CONFIG_LBD(AF) option as well. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| * ext4: Fix possible deadlock between ext4_truncate() and ext4_get_blocks()Jan Kara2009-08-17
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | During truncate we are sometimes forced to start a new transaction as the amount of blocks to be journaled is both quite large and hard to predict. So far we restarted a transaction while holding i_data_sem and that violates lock ordering because i_data_sem ranks below a transaction start (and it can lead to a real deadlock with ext4_get_blocks() mapping blocks in some page while having a transaction open). We fix the problem by dropping the i_data_sem before restarting the transaction and acquire it afterwards. It's slightly subtle that this works: 1) By the time ext4_truncate() is called, all the page cache for the truncated part of the file is dropped so get_block() should not be called on it (we only have to invalidate extent cache after we reacquire i_data_sem because some extent from not-truncated part could extend also into the part we are going to truncate). 2) Writes, migrate or defrag hold i_mutex so they are stopped for all the time of the truncate. This bug has been found and analyzed by Theodore Tso <tytso@mit.edu>. Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| * jbd2: Annotate transaction start also for jbd2_journal_restart()Jan Kara2009-08-17
| | | | | | | | | | | | | | | | | | | | lockdep annotation for a transaction start has been at the end of jbd2_journal_start(). But a transaction is also started from jbd2_journal_restart(). Move the lockdep annotation to start_this_handle() which covers both cases. Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| * ext4: Show unwritten extent flag in ext4_ext_show_leaf()Mingming2009-09-18
| | | | | | | | | | | | | | | | | | | | | | | | ext4_ext_show_leaf() will display the leaf extents when extent debugging is enabled. Printing out the unwritten bit is useful for debugging unwritten extent, allow us to see the unwritten extents vs written extents, after the unwritten extents are splitted or converted. Signed-off-by: Mingming Cao <cmm@us.ibm.com>
| * ext4: Compile warning fix when EXT_DEBUG enabledMingming2009-09-01
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When EXT_DEBUG is enabled I received the following compile warning on PPC64: CC [M] fs/ext4/inode.o CC [M] fs/ext4/extents.o fs/ext4/extents.c: In function ‘ext4_ext_rm_leaf’: fs/ext4/extents.c:2097: warning: format ‘%lu’ expects type ‘long unsigned int’, but argument 2 has type ‘ext4_lblk_t’ fs/ext4/extents.c: In function ‘ext4_ext_get_blocks’: fs/ext4/extents.c:2789: warning: format ‘%u’ expects type ‘unsigned int’, but argument 4 has type ‘long unsigned int’ fs/ext4/extents.c:2852: warning: format ‘%lu’ expects type ‘long unsigned int’, but argument 3 has type ‘ext4_lblk_t’ fs/ext4/extents.c:2953: warning: format ‘%lu’ expects type ‘long unsigned int’, but argument 4 has type ‘unsigned int’ CC [M] fs/ext4/migrate.o The patch fixes compile warning. Signed-off-by: Mingming Cao <cmm@us.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Index: linux-2.6.31-rc4/fs/ext4/extents.c ===================================================================
| * ext4: Avoid group preallocation for closed filesTheodore Ts'o2009-09-18
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently the group preallocation code tries to find a large (512) free block from which to do per-cpu group allocation for small files. The problem with this scheme is that it leaves the filesystem horribly fragmented. In the worst case, if the filesystem is unmounted and remounted (after a system shutdown, for example) we forget the fact that wee were using a particular (now-partially filled) 512 block extent. So the next time we try to allocate space for a small file, we will find *another* completely free 512 block chunk to allocate small files. Given that there are 32,768 blocks in a block group, after 64 iterations of "mount, write one 4k file in a directory, unmount", the block group will have 64 files, each separated by 511 blocks, and the block group will no longer have any free 512 completely free chunks of blocks for group preallocation space. So if we try to allocate blocks for a file that has been closed, such that we know the final size of the file, and the filesystem is not busy, avoid using group preallocation. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| * ext4: Fix bugs in mballoc's stream allocation modeTheodore Ts'o2009-08-09
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The logic around sbi->s_mb_last_group and sbi->s_mb_last_start was all screwed up. These fields were getting unconditionally all the time, set even when stream allocation had not taken place, and if they were being used when the file was smaller than s_mb_stream_request, which is when the allocation should _not_ be doing stream allocation. Fix this by determining whether or not we stream allocation should take place once, in ext4_mb_group_or_file(), and setting a flag which gets used in ext4_mb_regular_allocator() and ext4_mb_use_best_found(). This simplifies the code and assures that we are consistently using (or not using) the stream allocation logic. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| * ext4: Display the mballoc flags in mb_history in hex instead of decimalTheodore Ts'o2009-08-09
| | | | | | | | | | | | | | Displaying the flags in base 16 makes it easier to see which flags have been set. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| * ext4: Add configurable run-time mballoc debuggingTheodore Ts'o2009-09-18
| | | | | | | | | | | | | | Allow mballoc debugging to be enabled at run-time instead of just at compile time. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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