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2011-08-19UBIFS: not build debug messages with CONFIG_UBIFS_FS_DEBUG disabledMichal Marek
With $ grep -e UBIFS_FS_DEBUG -e DYNAMIC_DEBUG .config # CONFIG_UBIFS_FS_DEBUG is not set CONFIG_DYNAMIC_DEBUG=y Debug messages are kept in the object files due to the dynamic_pr_debug() macro, even if they are never going to be printed: $ make fs/ubifs/super.o $ strings fs/ubifs/super.o | grep 'compiled on' compiled on: Aug 11 2011 at 12:21:38 Use plain printk to fix this. Signed-off-by: Michal Marek <mmarek@suse.cz> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@intel.com>
2011-07-22Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6: (107 commits) vfs: use ERR_CAST for err-ptr tossing in lookup_instantiate_filp isofs: Remove global fs lock jffs2: fix IN_DELETE_SELF on overwriting rename() killing a directory fix IN_DELETE_SELF on overwriting rename() on ramfs et.al. mm/truncate.c: fix build for CONFIG_BLOCK not enabled fs:update the NOTE of the file_operations structure Remove dead code in dget_parent() AFS: Fix silly characters in a comment switch d_add_ci() to d_splice_alias() in "found negative" case as well simplify gfs2_lookup() jfs_lookup(): don't bother with . or .. get rid of useless dget_parent() in btrfs rename() and link() get rid of useless dget_parent() in fs/btrfs/ioctl.c fs: push i_mutex and filemap_write_and_wait down into ->fsync() handlers drivers: fix up various ->llseek() implementations fs: handle SEEK_HOLE/SEEK_DATA properly in all fs's that define their own llseek Ext4: handle SEEK_HOLE/SEEK_DATA generically Btrfs: implement our own ->llseek fs: add SEEK_HOLE and SEEK_DATA flags reiserfs: make reiserfs default to barrier=flush ... Fix up trivial conflicts in fs/xfs/linux-2.6/xfs_super.c due to the new shrinker callout for the inode cache, that clashed with the xfs code to start the periodic workers later.
2011-07-20fs: push i_mutex and filemap_write_and_wait down into ->fsync() handlersJosef Bacik
Btrfs needs to be able to control how filemap_write_and_wait_range() is called in fsync to make it less of a painful operation, so push down taking i_mutex and the calling of filemap_write_and_wait() down into the ->fsync() handlers. Some file systems can drop taking the i_mutex altogether it seems, like ext3 and ocfs2. For correctness sake I just pushed everything down in all cases to make sure that we keep the current behavior the same for everybody, and then each individual fs maintainer can make up their mind about what to do from there. Thanks, Acked-by: Jan Kara <jack@suse.cz> Signed-off-by: Josef Bacik <josef@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-07-08UBIFS: fix master node recoveryAnatolij Gustschin
When the 1st LEB was unmapped and written but 2nd LEB not, the master node recovery doesn't succeed after power cut. We see following error when mounting UBIFS partition on NOR flash: UBIFS error (pid 1137): ubifs_recover_master_node: failed to recover master node Correct 2nd master node offset check is needed to fix the problem. If the 2nd master node is at the end in the 2nd LEB, first master node is used for recovery. When checking for this condition we should check whether the master node is exactly at the end of the LEB (without remaining empty space) or whether it is followed by an empty space less than the master node size. Artem: when the error happened, offs2 = 261120, sz = 512, c->leb_size = 262016. Signed-off-by: Anatolij Gustschin <agust@denx.de> Signed-off-by: Artem Bityutskiy <dedekind1@gmail.com>
2011-07-04UBIFS: improve power cut emulation testingArtem Bityutskiy
This patch cleans-up and improves the power cut testing: 1. Kill custom 'simple_random()' function and use 'random32()' instead. 2. Make timeout larger 3. When cutting the buffer - fill the end with random data sometimes, not only with 0xFFs. 4. Some times cut in the middle of the buffer, not always at the end. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-07-04UBIFS: rename recovery testing variablesArtem Bityutskiy
Since the recovery testing is effectively about emulating power cuts by UBIFS, use "power cut" as the base term for all the related variables and name them correspondingly. This is just a minor clean-up for the sake of readability. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-07-04UBIFS: remove custom list of superblocksArtem Bityutskiy
This is a clean-up of the power-cut emulation code - remove the custom list of superblocks which we maintained to find the superblock by the UBI volume descriptor. We do not need that crud any longer, because now we can get the superblock as a function argument. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-07-04UBIFS: stop re-defining UBI operationsArtem Bityutskiy
Now when we use UBIFS helpers for all the I/O, we can remove the horrible hack of re-defining UBI I/O functions. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-07-04UBIFS: switch to I/O helpersArtem Bityutskiy
Switch the rest of direct UBI calls to UBIFS helper functions. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-07-04UBIFS: switch to ubifs_leb_writeArtem Bityutskiy
Stop using 'ubi_leb_write()' directly and switch to the 'ubifs_leb_write()' helper. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-07-04UBIFS: switch to ubifs_leb_readArtem Bityutskiy
Instead of using 'ubi_read()' function directly, used the 'ubifs_leb_read()' helper function instead. This allows to get rid of several redundant error messages and make sure that we always have a stack dump on read errors. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-07-04UBIFS: introduce more I/O helpersArtem Bityutskiy
Introduce the following I/O helper functions: 'ubifs_leb_read()', 'ubifs_leb_write()', 'ubifs_leb_change()', 'ubifs_leb_unmap()', 'ubifs_leb_map()', 'ubifs_is_mapped(). The idea is to wrap all UBI I/O functions in order to encapsulate various assertions and error path handling (error message, stack dump, switching to R/O mode). And there are some other benefits of this which will be used in the following patches. This patch does not switch whole UBIFS to use these functions yet. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-07-04UBIFS: always print stacktrace when switching to R/O modeArtem Bityutskiy
When switching to R/O mode due to an I/O error, always dump the stack, not only when debugging is enabled. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-07-04UBIFS: remove unused and unneeded debugging functionArtem Bityutskiy
This patch contains several minor clean-up and preparational cahnges. 1. Remove 'dbg_read()', 'dbg_write()', 'dbg_change()', and 'dbg_leb_erase()' functions as they are not used. 2. Remove 'dbg_leb_read()' and 'dbg_is_mapped()' as they are not really needed, it is fine to let reads go through in failure mode. 3. Rename 'offset' argument to 'offs' to be consistent with the rest of UBIFS code. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-07-04UBIFS: add global debugfs knobsArtem Bityutskiy
Now we have per-FS (superblock) debugfs knobs, but they have one drawback - you have to first mount the FS and only after this you can switch self-checks on/off. But often we want to have the checks enabled during the mount. Introduce global debugging knobs for this purpose. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-07-04UBIFS: introduce debugfs helpersArtem Bityutskiy
Separate out pieces of code from the debugfs file read/write functions and create separate 'interpret_user_input()'/'provide_user_output()' helpers. These helpers will be needed in one of the following patches, so this is just a preparational change. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-07-04UBIFS: re-arrange debugging code a bitArtem Bityutskiy
Move 'dbg_debugfs_init()' and 'dbg_debugfs_exit()' functions which initialize debugfs for whole UBIFS subsystem below the code which initializes debugfs for a particular UBIFS instance. And do the same for 'ubifs_debugging_init()' and 'ubifs_debugging_exit()' functions. This layout is a bit better for the next patches, so this is just a preparation. Also, rename 'open_debugfs_file()' into 'dfs_file_open()' for consistency. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-07-04UBIFS: be more informative in failure modeArtem Bityutskiy
When we are testing UBIFS recovery, it is better to print in which eraseblock we are going to fail. Currently UBIFS prints it only if recovery debugging messages are enabled, but this is not very practical. So change 'dbg_rcvry()' messages to 'ubifs_warn()' messages. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-07-04UBIFS: switch self-check knobs to debugfsArtem Bityutskiy
UBIFS has many built-in self-check functions which can be enabled using the debug_chks module parameter or the corresponding sysfs file (/sys/module/ubifs/parameters/debug_chks). However, this is not flexible enough because it is not per-filesystem. This patch moves this to debugfs interfaces. We already have debugfs support, so this patch just adds more debugfs files. While looking at debugfs support I've noticed that it is racy WRT file-system unmount, and added a TODO entry for that. This problem has been there for long time and it is quite standard debugfs PITA. The plan is to fix this later. This patch is simple, but it is large because it changes many places where we check if a particular type of checks is enabled or disabled. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-07-04UBIFS: lessen amount of debugging check typesArtem Bityutskiy
We have too many different debugging checks - lessen the amount by merging all index-related checks into one. At the same time, move the "force in-the-gap" test to the "index checks" class, because it is too heavy for the "general" class. This patch merges TNC, Old index, and Index size check and calles this just "index checks". Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-07-04UBIFS: introduce helper functions for debugging checks and testsArtem Bityutskiy
This patch introduces helper functions for all debugging checks, so instead of doing if (!(ubifs_chk_flags & UBIFS_CHK_GEN)) we now do if (!dbg_is_chk_gen(c)) This is a preparation to further changes where the flags will go away, and we'll need to only change the helper functions, but the code which utilizes them won't be touched. At the same time this patch removes 'dbg_force_in_the_gaps()', 'dbg_force_in_the_gaps_enabled()', and dbg_failure_mode helpers for consistency. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-07-04UBIFS: amend debugging inode size check function prototypeArtem Bityutskiy
Add 'const struct ubifs_info *c' parameter to 'dbg_check_synced_i_size()' function because we'll need it in the next patch when we switch to debugfs. So this patch is just a preparation. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-07-04UBIFS: amend debugging name check function prototypeArtem Bityutskiy
Add 'struct ubifs_info *c' parameter to the 'dbg_check_name()' debugging function - it will be needed in one of the following commits where we switch to debugfs. So this is just a preparation. Mark parameters as 'const' while on it. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-07-04UBIFS: add few commentaries about TNCArtem Bityutskiy
Add a couple of comments - while looking into TNC I could not easily figure out few facts, so it is a good idea to document them in the code. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-07-04UBIFS: use correct flags in lpropsArtem Bityutskiy
The UBIFS lpt tree is in many aspects similar to the TNC tree, and we have similar flags for these trees. And by mistake we use the COW_ZNODE flag for LPT in some places, instead of the right flag COW_CNODE. And this works only because these two constants have the same value. This patch makes all the LPT code to use COW_CNODE and also changes COW_CNODE constant value to make sure we do not misuse the flags any more. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-07-04UBIFS: harmonize znode flag helpersArtem Bityutskiy
We have 3 znode flags: cow, obsolete, dirty. For the last flag we have a 'ubifs_zn_dirty()' helper function, but for the other 2 flags we use 'test_bit()' directly. This patch makes the situation more consistent and introduces helpers for the other 2 flags: 'ubifs_zn_cow()' and 'ubifs_zn_obsolete()'. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-07-04UBIFS: remove dead codeArtem Bityutskiy
Remove dead pieces of code under "if (c->min_io_size == 1)" statement - we never execute it because in UBIFS 'c->min_io_size' is always at least 8. This are leftovers from old pre-mainline prototype. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-07-04UBIFS: remove unnecessary bracketsArtem Bityutskiy
Remove unnecessary brackets in "inode->i_flags |= (S_NOCMTIME)" statement to make the code not look silly. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-07-04UBIFS: minor cleanup: use S_ISREG helperArtem Bityutskiy
Instead of using long "(inode->i_mode & S_IFMT) != S_IFREG" expression, use shorted "!S_ISREG(inode->i_mode)". Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-07-04UBIFS: rename dbg_check_dir_size functionArtem Bityutskiy
Since this function is not only about size checking, rename it to 'dbg_check_dir()'. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-07-04UBIFS: improve inode dumping functionArtem Bityutskiy
Teach 'dbg_dump_inode()' dump directory entries for directory inodes. This requires few additional changes: 1. The 'c' argument of 'dbg_dump_inode()' cannot be const any more. 2. Users of 'dbg_dump_inode()' should not have 'tnc_mutex' locked. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-07-04UBIFS: dump stack when pnode or nnode reading failsArtem Bityutskiy
When we fail to read a pnode or nnode - print stacktrace if debugging is enabled. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-07-04UBIFS: lessen the size of debugging info data structureArtem Bityutskiy
This patch lessens the 'struct ubifs_debug_info' size by 90 bytes by allocating less bytes for the debugfs root directory name. It introduces macros for the name patter an length instead of hard-coding 100 bytes. It also makes UBIFS use 'snprintf()' and teaches it to gracefully catch situations when the name array is too short. Additionally, this patch makes 2 unrelated changes - I just thought they do not deserve separate commits: simplifies 'ubifs_assert()' for non-debugging case and makes 'dbg_debugfs_init()' properly verify debugfs return code which may be an error code or NULL, so we should you 'IS_ERR_OR_NULL()' instead of 'IS_ERR()'. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-07-04UBIFS: return EROFS in case of broken commitArtem Bityutskiy
If commit failed and it is in broken state, UBIFS switches to R/O mode. Most operations return -EROFS in this case, except of commit which returns -EINVAL. Make it return -EROFS too for consistency. This is also important for our power cut emulation testing. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-06-20ubifs: dereferencing an ERR_PTR in ubifs_mount()Dan Carpenter
d251ed271d5 "ubifs: fix sget races" left out the goto from this error path so the static checkers complain that we're dereferencing "sb" when it's an ERR_PTR. Signed-off-by: Dan Carpenter <error27@gmail.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-06-12ubifs: fix sget racesAl Viro
* allocate ubifs_info in ->mount(), fill it enough for sb_test() and set ->s_fs_info to it in set() callback passed to sget(). * do *not* free it in ->put_super(); do that in ->kill_sb() after we'd done kill_anon_super(). * don't free it in ubifs_fill_super() either - deactivate_locked_super() done by caller when ubifs_fill_super() returns an error will take care of that sucker. * get rid of kludge with passing ubi to ubifs_fill_super() in ->s_fs_info; we only need it in alloc_ubifs_info(), so ubifs_fill_super() will need only ubifs_info. Which it will find in ->s_fs_info just fine, no need to reassign anything... As the result, sb_test() becomes safe to apply to all superblocks that can be found by sget() (and a kludge with temporary use of ->s_fs_info to store a pointer to very different structure goes away). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-06-12ubifs: split allocation of ubifs_info into a separate functionAl Viro
preparation to ubifs sget() race fixes Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-06-03UBIFS: fix-up free space earlierBen Gardiner
The free space fixup is currently initiated during mount after the call to ubifs_write_master() which results in a write to PEBs; this has been observed with the patch 'assert no fixup when writing a node' applied: Move the free space fixup on mount to before the calls to ubifs_recover_inl_heads() and ubifs_write_master(). This results in no assertions with the previously mentioned patch applied. Artem: tweaked the patch a bit Signed-off-by: Ben Gardiner <bengardiner@nanometrics> Reviewed-by: Matthew L. Creech <mlcreech@gmail.com> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-06-03UBIFS: intialize LPT earlierBen Gardiner
The current 'mount_ubifs()' implementation does not initialize the LPT until the the master node is marked dirty. Move the LPT initialization to before marking the master node dirty. This is a preparation for the next patch which will move the free-space-fixup check to before marking the master node dirty, because we have to fix-up the free space before doing any writes. Artem: massaged the patch and commit message. Signed-off-by: Ben Gardiner <bengardiner@nanometrics.ca> Reviewed-by: Matthew L. Creech <mlcreech@gmail.com> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-06-03UBIFS: assert no fixup when writing a nodeBen Gardiner
The current free space fixup can result in some writing to the UBI volume when the space_fixup flag is set. To catch instances where UBIFS is writing to the NAND while the space_fixup flag is set, add an assert to ubifs_write_node(). Artem: tweaked the patch, added similar assertion to the write buffer write path. Signed-off-by: Ben Gardiner <bengardiner@nanometrics.ca> Reviewed-by: Matthew L. Creech <mlcreech@gmail.com> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-06-03UBIFS: fix clean znode counter corruption in error casesArtem Bityutskiy
UBIFS maintains per-filesystem and global clean znode counters ('c->clean_zn_cnt' and 'ubifs_clean_zn_cnt'). It is important to maintain correct values there since the shrinker relies on 'ubifs_clean_zn_cnt'. However, in case of failures during commit the counters were corrupted. E.g., if a failure happens in the middle of 'write_index()', then some nodes in the commit list ('c->cnext') are marked as clean, and some are marked as dirty. And the 'ubifs_destroy_tnc_subtree()' frees does not retrun correct count, and we end up with non-zero 'c->clean_zn_cnt' when unmounting. This means that if we have 2 file-sytem and one of them fails, and we unmount it, 'ubifs_clean_zn_cnt' stays incorrect and confuses the shrinker. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-06-03UBIFS: fix memory leak on error pathArtem Bityutskiy
UBIFS leaks memory on error path in 'ubifs_jnl_update()' in case of write failure because it forgets to free the 'struct ubifs_dent_node *dent' object. Although the object is small, the alignment can make it large - e.g., 2KiB if the min. I/O unit is 2KiB. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com> Cc: stable@kernel.org
2011-06-03UBIFS: fix shrinker object count reportsArtem Bityutskiy
Sometimes VM asks the shrinker to return amount of objects it can shrink, and we return the ubifs_clean_zn_cnt in that case. However, it is possible that this counter is negative for a short period of time, due to the way UBIFS TNC code updates it. And I can observe the following warnings sometimes: shrink_slab: ubifs_shrinker+0x0/0x2b7 [ubifs] negative objects to delete nr=-8541616642706119788 This patch makes sure UBIFS never returns negative count of objects. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com> Cc: stable@kernel.org
2011-06-01UBIFS: fix recovery broken by the previous recovery fixArtem Bityutskiy
Unfortunately, the recovery fix d1606a59b6be4ea392eabd40d1250aa1eeb19efb (UBIFS: fix extremely rare mount failure) broke recovery. This commit make UBIFS drop the last min. I/O unit in all journal heads, but this is needed only for the GC head. And this does not work for non-GC heads. For example, if suppose we have min. I/O units A and B, and A contains a valid node X, which was fsynced, and then a group of nodes Y which spans the rest of A and B. In this case we'll drop not only Y, but also X, which is obviously incorrect. This patch fixes the issue and additionally makes recovery to drop last min. I/O unit only for the GC head, and leave things as they have been for ages for the other heads - this is safer. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-06-01UBIFS: amend ubifs_recover_leb interfaceArtem Bityutskiy
Instead of passing "grouped" parameter to 'ubifs_recover_leb()' which tells whether the nodes are grouped in the LEB to recover, pass the journal head number and let 'ubifs_recover_leb()' look at the journal head's 'grouped' flag. This patch is a preparation to a further fix where we'll need to know the journal head number for other purposes. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-06-01UBIFS: introduce a "grouped" journal head flagArtem Bityutskiy
Journal heads are different in a way how UBIFS writes nodes there. All normal journal heads receive grouped nodes, while the GC journal heads receives ungrouped nodes. This patch adds a 'grouped' flag to 'struct ubifs_jhead' which describes this property. This patch is a preparation to a further recovery fix. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-06-01UBIFS: supress false error messagesArtem Bityutskiy
Commit ab51afe05273741f72383529ef488aa1ea598ec6 was a good clean-up, but it introduced a regression - now UBIFS prints scary error messages during recovery on all corrupted nodes, even though the corruptions are expected (due to a power cut). This patch fixes the issue. Additionally fix a typo in a commentary introduced by the same commit. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-05-29cifs/ubifs: Fix shrinker API change falloutAl Viro
Commit 1495f230fa77 ("vmscan: change shrinker API by passing shrink_control struct") changed the API of ->shrink(), but missed ubifs and cifs instances. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-05-28ubifs: remove unnecessary dentry_unhash from rmdir, dir renameSage Weil
ubifs does not have problems with references to unlinked directories. CC: Artem Bityutskiy <dedekind1@gmail.com> CC: Adrian Hunter <adrian.hunter@nokia.com> CC: linux-mtd@lists.infradead.org Signed-off-by: Sage Weil <sage@newdream.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-05-27fs: pass exact type of data dirties to ->dirty_inodeChristoph Hellwig
Tell the filesystem if we just updated timestamp (I_DIRTY_SYNC) or anything else, so that the filesystem can track internally if it needs to push out a transaction for fdatasync or not. This is just the prototype change with no user for it yet. I plan to push large XFS changes for the next merge window, and getting this trivial infrastructure in this window would help a lot to avoid tree interdependencies. Also remove incorrect comments that ->dirty_inode can't block. That has been changed a long time ago, and many implementations rely on it. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>