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* fs: logfs: Fix up MTD=y build.Paul Mundt2010-11-01
| | | | | | | | Commit 7d945a3aa760 ("logfs get_sb, part 3") broke the logfs build when CONFIG_MTD is set due to a mangled logfs_get_sb_mtd() definition. Signed-off-by: Paul Mundt <lethal@linux-sh.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* switch logfs to ->mount()Al Viro2010-10-29
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* logfs: fix a leak in get_sbAl Viro2010-10-29
| | | | | | | a) switch ->put_device() to logfs_super * b) actually call it on early failures in logfs_get_sb_device() Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* logfs get_sb, part 3Al Viro2010-10-29
| | | | | | take logfs_get_sb_device() calls to logfs_get_sb() itself Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* logfs get_sb, part 2Al Viro2010-10-29
| | | | | | | take setting s_bdev/s_mtd/s_devops to callers of logfs_get_sb_device(), don't bother passing them separately Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* logfs get_sb massage, part 1Al Viro2010-10-29
| | | | | | | move allocation of logfs_super to logfs_get_sb, pass it to logfs_get_sb_...(). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* new helper: ihold()Al Viro2010-10-25
| | | | | | Clones an existing reference to inode; caller must already hold one. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* llseek: automatically add .llseek fopArnd Bergmann2010-10-15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | All file_operations should get a .llseek operation so we can make nonseekable_open the default for future file operations without a .llseek pointer. The three cases that we can automatically detect are no_llseek, seq_lseek and default_llseek. For cases where we can we can automatically prove that the file offset is always ignored, we use noop_llseek, which maintains the current behavior of not returning an error from a seek. New drivers should normally not use noop_llseek but instead use no_llseek and call nonseekable_open at open time. Existing drivers can be converted to do the same when the maintainer knows for certain that no user code relies on calling seek on the device file. The generated code is often incorrectly indented and right now contains comments that clarify for each added line why a specific variant was chosen. In the version that gets submitted upstream, the comments will be gone and I will manually fix the indentation, because there does not seem to be a way to do that using coccinelle. Some amount of new code is currently sitting in linux-next that should get the same modifications, which I will do at the end of the merge window. Many thanks to Julia Lawall for helping me learn to write a semantic patch that does all this. ===== begin semantic patch ===== // This adds an llseek= method to all file operations, // as a preparation for making no_llseek the default. // // The rules are // - use no_llseek explicitly if we do nonseekable_open // - use seq_lseek for sequential files // - use default_llseek if we know we access f_pos // - use noop_llseek if we know we don't access f_pos, // but we still want to allow users to call lseek // @ open1 exists @ identifier nested_open; @@ nested_open(...) { <+... nonseekable_open(...) ...+> } @ open exists@ identifier open_f; identifier i, f; identifier open1.nested_open; @@ int open_f(struct inode *i, struct file *f) { <+... ( nonseekable_open(...) | nested_open(...) ) ...+> } @ read disable optional_qualifier exists @ identifier read_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; expression E; identifier func; @@ ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off) { <+... ( *off = E | *off += E | func(..., off, ...) | E = *off ) ...+> } @ read_no_fpos disable optional_qualifier exists @ identifier read_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; @@ ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off) { ... when != off } @ write @ identifier write_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; expression E; identifier func; @@ ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off) { <+... ( *off = E | *off += E | func(..., off, ...) | E = *off ) ...+> } @ write_no_fpos @ identifier write_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; @@ ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off) { ... when != off } @ fops0 @ identifier fops; @@ struct file_operations fops = { ... }; @ has_llseek depends on fops0 @ identifier fops0.fops; identifier llseek_f; @@ struct file_operations fops = { ... .llseek = llseek_f, ... }; @ has_read depends on fops0 @ identifier fops0.fops; identifier read_f; @@ struct file_operations fops = { ... .read = read_f, ... }; @ has_write depends on fops0 @ identifier fops0.fops; identifier write_f; @@ struct file_operations fops = { ... .write = write_f, ... }; @ has_open depends on fops0 @ identifier fops0.fops; identifier open_f; @@ struct file_operations fops = { ... .open = open_f, ... }; // use no_llseek if we call nonseekable_open //////////////////////////////////////////// @ nonseekable1 depends on !has_llseek && has_open @ identifier fops0.fops; identifier nso ~= "nonseekable_open"; @@ struct file_operations fops = { ... .open = nso, ... +.llseek = no_llseek, /* nonseekable */ }; @ nonseekable2 depends on !has_llseek @ identifier fops0.fops; identifier open.open_f; @@ struct file_operations fops = { ... .open = open_f, ... +.llseek = no_llseek, /* open uses nonseekable */ }; // use seq_lseek for sequential files ///////////////////////////////////// @ seq depends on !has_llseek @ identifier fops0.fops; identifier sr ~= "seq_read"; @@ struct file_operations fops = { ... .read = sr, ... +.llseek = seq_lseek, /* we have seq_read */ }; // use default_llseek if there is a readdir /////////////////////////////////////////// @ fops1 depends on !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier readdir_e; @@ // any other fop is used that changes pos struct file_operations fops = { ... .readdir = readdir_e, ... +.llseek = default_llseek, /* readdir is present */ }; // use default_llseek if at least one of read/write touches f_pos ///////////////////////////////////////////////////////////////// @ fops2 depends on !fops1 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier read.read_f; @@ // read fops use offset struct file_operations fops = { ... .read = read_f, ... +.llseek = default_llseek, /* read accesses f_pos */ }; @ fops3 depends on !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier write.write_f; @@ // write fops use offset struct file_operations fops = { ... .write = write_f, ... + .llseek = default_llseek, /* write accesses f_pos */ }; // Use noop_llseek if neither read nor write accesses f_pos /////////////////////////////////////////////////////////// @ fops4 depends on !fops1 && !fops2 && !fops3 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier read_no_fpos.read_f; identifier write_no_fpos.write_f; @@ // write fops use offset struct file_operations fops = { ... .write = write_f, .read = read_f, ... +.llseek = noop_llseek, /* read and write both use no f_pos */ }; @ depends on has_write && !has_read && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier write_no_fpos.write_f; @@ struct file_operations fops = { ... .write = write_f, ... +.llseek = noop_llseek, /* write uses no f_pos */ }; @ depends on has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier read_no_fpos.read_f; @@ struct file_operations fops = { ... .read = read_f, ... +.llseek = noop_llseek, /* read uses no f_pos */ }; @ depends on !has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; @@ struct file_operations fops = { ... +.llseek = noop_llseek, /* no read or write fn */ }; ===== End semantic patch ===== Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Julia Lawall <julia@diku.dk> Cc: Christoph Hellwig <hch@infradead.org>
* logfs: kill BKLArnd Bergmann2010-08-13
| | | | | | | | | | logfs does not need the BKL, so use ->unlocked_ioctl instead of ->ioctl in file operations. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Joern Engel <joern@logfs.org> [ fixed trivial conflict ] Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
* Make ->drop_inode() just return whether inode needs to be droppedAl Viro2010-08-09
| | | | | | ... and let iput_final() do the actual eviction or retention Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* convert logfs to ->evict_inode()Al Viro2010-08-09
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* logfs: get rid of magical inodesAl Viro2010-08-09
| | | | | | | ordering problems at ->kill_sb() time are solved by doing iput() of these suckers in ->put_super() Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* always call inode_change_ok early in ->setattrChristoph Hellwig2010-08-09
| | | | | | | | | Make sure we call inode_change_ok before doing any changes in ->setattr, and make sure to call it even if our fs wants to ignore normal UNIX permissions, but use the ATTR_FORCE to skip those. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* remove inode_setattrChristoph Hellwig2010-08-09
| | | | | | | | | | | | | | | | | | | Replace inode_setattr with opencoded variants of it in all callers. This moves the remaining call to vmtruncate into the filesystem methods where it can be replaced with the proper truncate sequence. In a few cases it was obvious that we would never end up calling vmtruncate so it was left out in the opencoded variant: spufs: explicitly checks for ATTR_SIZE earlier btrfs,hugetlbfs,logfs,dlmfs: explicitly clears ATTR_SIZE earlier ufs: contains an opencoded simple_seattr + truncate that sets the filesize just above In addition to that ncpfs called inode_setattr with handcrafted iattrs, which allowed to trim down the opencoded variant. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* fix leak in __logfs_create()Al Viro2010-08-09
| | | | | | | if kmalloc fails, we still need to drop the inode, as we do on other failure exits. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* drop unused dentry argument to ->fsyncChristoph Hellwig2010-05-27
| | | | | Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* logfs: replace inode uid,gid,mode initialization with helper functionAl Viro2010-05-21
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* Merge branch 'for-linus' of ↵Linus Torvalds2010-05-20
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (44 commits) vlynq: make whole Kconfig-menu dependant on architecture add descriptive comment for TIF_MEMDIE task flag declaration. EEPROM: max6875: Header file cleanup EEPROM: 93cx6: Header file cleanup EEPROM: Header file cleanup agp: use NULL instead of 0 when pointer is needed rtc-v3020: make bitfield unsigned PCI: make bitfield unsigned jbd2: use NULL instead of 0 when pointer is needed cciss: fix shadows sparse warning doc: inode uses a mutex instead of a semaphore. uml: i386: Avoid redefinition of NR_syscalls fix "seperate" typos in comments cocbalt_lcdfb: correct sections doc: Change urls for sparse Powerpc: wii: Fix typo in comment i2o: cleanup some exit paths Documentation/: it's -> its where appropriate UML: Fix compiler warning due to missing task_struct declaration UML: add kernel.h include to signal.c ...
| * fix "seperate" typos in commentsAnand Gadiyar2010-05-10
| | | | | | | | | | | | | | s/seperate/separate Signed-off-by: Anand Gadiyar <gadiyar@ti.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
* | Merge git://git.kernel.org/pub/scm/linux/kernel/git/joern/logfsLinus Torvalds2010-05-17
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * git://git.kernel.org/pub/scm/linux/kernel/git/joern/logfs: logfs: handle powerfail on NAND flash logfs: handle errors from get_mtd_device() logfs: remove unused variable logfs: fix sync logfs: fix compile failure logfs: initialize li->li_refcount logfs: commit reservations under space pressure logfs: survive logfs_buf_recover read errors logfs: Close i_ino reuse race logfs: fix logfs_seek_hole() logfs: Return -EINVAL if filesystem image doesn't match LogFS: Fix typo in b6349ac8 logfs: testing the wrong variable
| * | logfs: handle powerfail on NAND flashJoern Engel2010-05-07
| | | | | | | | | | | | | | | | | | | | | The write buffer may not have been written and may no longer be written due to an interrupted write in the affected page. Signed-off-by: Joern Engel <joern@logfs.org>
| * | logfs: handle errors from get_mtd_device()Dan Carpenter2010-05-07
| | | | | | | | | | | | | | | | | | | | | | | | The get_mtd_device() function returns error pointers on failure and if we don't handle it, it leads to a crash. Signed-off-by: Dan Carpenter <error27@gmail.com> Signed-off-by: Joern Engel <joern@logfs.org>
| * | logfs: remove unused variableJoern Engel2010-05-07
| | | | | | | | | | | | Signed-off-by: Joern Engel <joern@logfs.org>
| * | logfs: fix syncJoern Engel2010-05-05
| | | | | | | | | | | | | | | | | | Rather self-explanatory. Signed-off-by: Joern Engel <joern@logfs.org>
| * | logfs: fix compile failureJoern Engel2010-05-05
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When CONFIG_BLOCK is not enabled: fs/logfs/super.c:142: error: implicit declaration of function 'bdev_get_queue' fs/logfs/super.c:142: error: invalid type argument of '->' (have 'int') Found by Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Joern Engel <joern@logfs.org>
| * | logfs: initialize li->li_refcountPrasad Joshi2010-05-04
| | | | | | | | | | | | | | | | | | | | | | | | li_refcount was not re-initialized in function logfs_init_inode(), small patch that will fix the problem Signed-off-by: Prasad Joshi <prasadjoshi124@gmail.com> Signed-off-by: Joern Engel <joern@logfs.org>
| * | logfs: commit reservations under space pressureJoern Engel2010-05-04
| | | | | | | | | | | | | | | | | | Ensures we only return -ENOSPC when there really is no space. Signed-off-by: Joern Engel <joern@logfs.org>
| * | logfs: survive logfs_buf_recover read errorsJoern Engel2010-05-04
| | | | | | | | | | | | | | | | | | Refusing to mount beats a kernel crash. Signed-off-by: Joern Engel <joern@logfs.org>
| * | logfs: Close i_ino reuse raceJoern Engel2010-05-01
| | | | | | | | | | | | | | | | | | | | | logfs_seek_hole() may return the same offset it is passed as argument. Found by Prasad Joshi <prasadjoshi124@gmail.com> Signed-off-by: Joern Engel <joern@logfs.org>
| * | logfs: fix logfs_seek_hole()Joern Engel2010-05-01
| | | | | | | | | | | | | | | | | | | | | logfs_seek_hole(inode, 0x200) would crap itself if the inode contained just 0x1ff (or fewer) blocks. Signed-off-by: Joern Engel <joern@logfs.org>
| * | logfs: Return -EINVAL if filesystem image doesn't matchJoern Engel2010-05-01
| | | | | | | | | | | | Signed-off-by: Joern Engel <joern@logfs.org>
| * | LogFS: Fix typo in b6349ac8Joern Engel2010-04-29
| | | | | | | | | | | | Signed-off-by: Joern Engel <joern@logfs.org>
| * | logfs: testing the wrong variableDan Carpenter2010-04-29
| |/ | | | | | | | | | | | | There is a typo here. We should test "last" instead of "first". Signed-off-by: Dan Carpenter <error27@gmail.com> Signed-off-by: Joern Engel <joern@logfs.org>
* / Fix double-free in logfsAl Viro2010-05-15
|/ | | | | | iput() is needed *until* we'd done successful d_alloc_root() Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* Merge git://git.kernel.org/pub/scm/linux/kernel/git/joern/logfsLinus Torvalds2010-04-21
|\ | | | | | | | | | | | | | | | | | | | | | | | | * git://git.kernel.org/pub/scm/linux/kernel/git/joern/logfs: [LogFS] Split large truncated into smaller chunks [LogFS] Set s_bdi [LogFS] Prevent mempool_destroy NULL pointer dereference [LogFS] Move assertion [LogFS] Plug 8 byte information leak [LogFS] Prevent memory corruption on large deletes [LogFS] Remove unused method Fix trivial conflict with added header includes in fs/logfs/super.c
| * [LogFS] Split large truncated into smaller chunksJoern Engel2010-04-20
| | | | | | | | | | | | | | | | Truncate would do an almost limitless amount of work without invoking the garbage collector in between. Split it up into more manageable, though still large, chunks. Signed-off-by: Joern Engel <joern@logfs.org>
| * [LogFS] Set s_bdiJoern Engel2010-04-17
| | | | | | | | | | | | | | | | | | | | Since 32a88aa1 sync() was turned into a NOP for logfs. Worse, sync() would not return an error, giving the illusion that writeout had actually happened. Afaics jffs2 was broken as well. Signed-off-by: Joern Engel <joern@logfs.org>
| * [LogFS] Prevent mempool_destroy NULL pointer dereferenceJoern Engel2010-04-15
| | | | | | | | | | | | | | | | | | | | | | | | It would probably be better to just accept NULL pointers in mempool_destroy(). But for the current -rc series let's keep things simple. This patch was lost in the cracks for a while. Kevin Cernekee <cernekee@gmail.com> had to rediscover the problem and send a similar patch because of it. :( Signed-off-by: Joern Engel <joern@logfs.org>
| * [LogFS] Move assertionJoern Engel2010-04-13
| | | | | | | | | | | | The assertion is valid independently of the condition. Signed-off-by: Joern Engel <joern@logfs.org>
| * [LogFS] Plug 8 byte information leakJoern Engel2010-04-13
| | | | | | | | | | | | | | Within each journal segment, 8 bytes at offset 24 would remain uninitialized. Signed-off-by: Joern Engel <joern@logfs.org>
| * [LogFS] Prevent memory corruption on large deletesJoern Engel2010-04-13
| | | | | | | | | | | | | | | | | | | | | | | | Removing sufficiently large files would create aliases for a large number of segments. This in turn results in a large number of journal entries and an overflow of s_je_array. Cheap fix is to add a BUG_ON, turning memory corruption into something annoying, but less dangerous. Real fix is to count the number of affected segments and prevent the problem completely. Signed-off-by: Joern Engel <joern@logfs.org>
| * [LogFS] Remove unused methodJoern Engel2010-03-30
| | | | | | | | | | | | All callers are long gone. Signed-off-by: Joern Engel <joern@logfs.org>
* | Merge branch 'master' into export-slabhTejun Heo2010-04-04
|\|
| * [LogFS] Erase new journal segmentsJoern Engel2010-03-29
| | | | | | | | | | | | | | | | | | | | If the device contains on old logfs image and the journal is moved to segment that have never been used by the current logfs and not all journal segments are erased before the next mount, the old content can confuse mount code. To prevent this, always erase the new journal segments. Signed-off-by: Joern Engel <joern@logfs.org>
| * [LogFS] Move reserved segments with journalJoern Engel2010-03-29
| | | | | | | | | | | | Fixes a GC livelock. Signed-off-by: Joern Engel <joern@logfs.org>
| * [LogFS] Clear PagePrivate when moving journalJoern Engel2010-03-28
| | | | | | | | | | | | | | do_logfs_journal_wl_pass() must call freeseg(), thereby clear PagePrivate on all pages of the current journal segment. Signed-off-by: Joern Engel <joern@logfs.org>
| * Simplify and fix pad_wbufJoern Engel2010-03-28
| | | | | | | | | | | | | | | | | | | | | | A comment in the old code read: /* The math in this function can surely use some love */ And indeed it did. In the case that area->a_used_bytes is exactly 4096 bytes below segment size it fell apart. pad_wbuf is now split into two helpers that are significantly less complicated. Signed-off-by: Joern Engel <joern@logfs.org>
| * Prevent data corruption in logfs_rewrite_block()Joern Engel2010-03-28
| | | | | | | | | | | | | | | | The comment was correct, so make the code match the comment. As the new comment indicates, we might be able to do a little less work. But for the current -rc series let's keep it simple and just fix the bug. Signed-off-by: Joern Engel <joern@logfs.org>
| * Use deactivate_locked_superJoern Engel2010-03-27
| | | | | | | | | | | | Found by Al Viro. Signed-off-by: Joern Engel <joern@logfs.org>
| * Fix logfs_get_sb_final error pathJoern Engel2010-03-27
| | | | | | | | | | | | | | rootdir was already allocated, so we must iput it again. Found by Al Viro. Signed-off-by: Joern Engel <joern@logfs.org>
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