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2007-05-09Fix occurrences of "the the "Michael Opdenacker3-4/+4
Signed-off-by: Michael Opdenacker <michael@free-electrons.com> Signed-off-by: Adrian Bunk <bunk@stusta.de>
2007-05-08Merge branch 'for-linus' of ↵Linus Torvalds8-8/+31
git://git.kernel.org/pub/scm/linux/kernel/git/shaggy/jfs-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/shaggy/jfs-2.6: JFS: Fix race waking up jfsIO kernel thread JFS: use __set_current_state() Copy i_flags to jfs inode flags on write JFS: document uid, gid, and umask mount options in jfs.txt
2007-05-08header cleaning: don't include smp_lock.h when not usedRandy Dunlap2-2/+0
Remove includes of <linux/smp_lock.h> where it is not used/needed. Suggested by Al Viro. Builds cleanly on x86_64, i386, alpha, ia64, powerpc, sparc, sparc64, and arm (all 59 defconfigs). Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-07slab allocators: Remove SLAB_DEBUG_INITIAL flagChristoph Lameter2-4/+2
I have never seen a use of SLAB_DEBUG_INITIAL. It is only supported by SLAB. I think its purpose was to have a callback after an object has been freed to verify that the state is the constructor state again? The callback is performed before each freeing of an object. I would think that it is much easier to check the object state manually before the free. That also places the check near the code object manipulation of the object. Also the SLAB_DEBUG_INITIAL callback is only performed if the kernel was compiled with SLAB debugging on. If there would be code in a constructor handling SLAB_DEBUG_INITIAL then it would have to be conditional on SLAB_DEBUG otherwise it would just be dead code. But there is no such code in the kernel. I think SLUB_DEBUG_INITIAL is too problematic to make real use of, difficult to understand and there are easier ways to accomplish the same effect (i.e. add debug code before kfree). There is a related flag SLAB_CTOR_VERIFY that is frequently checked to be clear in fs inode caches. Remove the pointless checks (they would even be pointless without removeal of SLAB_DEBUG_INITIAL) from the fs constructors. This is the last slab flag that SLUB did not support. Remove the check for unimplemented flags from SLUB. Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-05JFS: Fix race waking up jfsIO kernel threadDave Kleikamp1-1/+2
It's possible for a journal I/O request to be added to the log_redrive queue and the jfsIO thread to be awakened after the thread releases log_redrive_lock but before it sets its state to TASK_INTERRUPTIBLE. The jfsIO thread should set the state before giving up the spinlock, so the waking thread will really wake it. Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
2007-04-26JFS: use __set_current_state()Milind Arun Choudhary3-6/+6
use __set_current_state(TASK_*) instead of current->state = TASK_* Signed-off-by: Milind Arun Choudhary <milindchoudhary@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
2007-04-25Copy i_flags to jfs inode flags on writeDave Kleikamp5-1/+23
This mirrors Jan Kara's patches for ext3. This patch makes sure that changes made to inode->i_flags are reflected on disk for jfs. It also moves a call of jfs_set_inode_flags() to be more consistent with where jfs_get_inode_flags() is called. Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
2007-02-26Merge branch 'for-linus' of ↵Linus Torvalds1-1/+2
git://git.kernel.org/pub/scm/linux/kernel/git/shaggy/jfs-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/shaggy/jfs-2.6: JFS: Get rid of "may be used uninitialized" warnings
2007-02-12[PATCH] Mark struct super_operations constJosef 'Jeff' Sipek1-2/+2
This patch is inspired by Arjan's "Patch series to mark struct file_operations and struct inode_operations const". Compile tested with gcc & sparse. Signed-off-by: Josef 'Jeff' Sipek <jsipek@cs.sunysb.edu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-12[PATCH] mark struct inode_operations const 2Arjan van de Ven4-6/+6
Many struct inode_operations in the kernel can be "const". Marking them const moves these to the .rodata section, which avoids false sharing with potential dirty data. In addition it'll catch accidental writes at compile time to these shared resources. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-09JFS: Get rid of "may be used uninitialized" warningsDave Kleikamp1-1/+2
Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
2007-01-26JFS: Remove incorrect kgdb defineDave Kleikamp1-5/+0
jfs_debug.h uses an incorrect CONFIG_KERNEL_ASSERT ifdef to redefine the assert macro for kgdb use. I believe the code worked a long time ago, but today it's not a valid config option. Since I'm not aware of anybody interested in debugging jfs with kgdb, it should just be removed. Thanks to Robert P. J. Day for reporting this. Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
2007-01-17JFS: call io_schedule() instead of schedule() to avoid deadlockDave Kleikamp3-3/+3
The introduction of Jens Axboe's explicit i/o plugging patches introduced a deadlock in jfs. This was caused by the process initiating I/O not unplugging the queue before waiting on the commit thread. The commit thread itself was waiting for that I/O to complete. Calling io_schedule() rather than schedule() unplugs the I/O queue avoiding the deadlock, and it appears to be the right function to call in any case. Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
2007-01-09JFS: Add lockdep annotationsDave Kleikamp5-41/+74
Yeah, it's about time. Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
2007-01-09JFS: Avoid BUG() on a damaged file systemDave Kleikamp1-0/+15
On Mon, 2006-12-18 at 19:51 +0100, Eric Sesterhenn wrote: > hi, > > while playing around with fsfuzzer, i got the following oops with jfs: > > [ 851.804875] BUG at fs/jfs/jfs_xtree.c:760 > assert(!BT_STACK_FULL(btstack)) > [ 851.805179] ------------[ cut here ]------------ > [ 851.805238] kernel BUG at fs/jfs/jfs_xtree.c:760! JFS should mark the superblock dirty and return an error rather than calling BUG(). Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
2006-12-21[PATCH] Fix JFS after clear_page_dirty() removalDave Kleikamp1-14/+1
This patch removes some questionable code that attempted to make a no-longer-used page easier to reclaim. Calling metapage_writepage against such a page will not result in any I/O being performed, so removing this code shouldn't be a big deal. [ It's likely that we could have just replaced the "clear_page_dirty()" call with a call to "cancel_dirty_page()" instead, but in the meantime this is cleaner and simpler anyway, so unless there is some overriding reason (and Dave implies there isn't) I'll just use this patch as-is. - Linus ] Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-12-13[PATCH] getting rid of all casts of k[cmz]alloc() callsRobert P. J. Day2-3/+3
Run this: #!/bin/sh for f in $(grep -Erl "\([^\)]*\) *k[cmz]alloc" *) ; do echo "De-casting $f..." perl -pi -e "s/ ?= ?\([^\)]*\) *(k[cmz]alloc) *\(/ = \1\(/" $f done And then go through and reinstate those cases where code is casting pointers to non-pointers. And then drop a few hunks which conflicted with outstanding work. Cc: Russell King <rmk@arm.linux.org.uk>, Ian Molton <spyro@f2s.com> Cc: Mikael Starvik <starvik@axis.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: Roman Zippel <zippel@linux-m68k.org> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Kyle McMartin <kyle@mcmartin.ca> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Jeff Dike <jdike@addtoit.com> Cc: Greg KH <greg@kroah.com> Cc: Jens Axboe <jens.axboe@oracle.com> Cc: Paul Fulghum <paulkf@microgate.com> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Karsten Keil <kkeil@suse.de> Cc: Mauro Carvalho Chehab <mchehab@infradead.org> Cc: Jeff Garzik <jeff@garzik.org> Cc: James Bottomley <James.Bottomley@steeleye.com> Cc: Ian Kent <raven@themaw.net> Cc: Steven French <sfrench@us.ibm.com> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Neil Brown <neilb@cse.unsw.edu.au> Cc: Jaroslav Kysela <perex@suse.cz> Cc: Takashi Iwai <tiwai@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-12-12Merge branch 'for-linus' of ↵Linus Torvalds1-21/+21
git://git.kernel.org/pub/scm/linux/kernel/git/shaggy/jfs-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/shaggy/jfs-2.6: JFS: Fix conflicting superblock flags
2006-12-08[PATCH] struct path: convert jfsJosef Sipek1-1/+1
Signed-off-by: Josef Sipek <jsipek@fsl.cs.sunysb.edu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-12-07[PATCH] fs/*: trivial vsnprintf() conversionAlexey Dobriyan1-1/+1
It would very lame to get buffer overflow via one of the following. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Cc: Dave Kleikamp <shaggy@austin.ibm.com> Cc: Mark Fasheh <mark.fasheh@oracle.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-12-07[PATCH] Add include/linux/freezer.h and move definitions from sched.hNigel Cunningham2-2/+2
Move process freezing functions from include/linux/sched.h to freezer.h, so that modifications to the freezer or the kernel configuration don't require recompiling just about everything. [akpm@osdl.org: fix ueagle driver] Signed-off-by: Nigel Cunningham <nigel@suspend2.net> Cc: "Rafael J. Wysocki" <rjw@sisk.pl> Cc: Pavel Machek <pavel@ucw.cz> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-12-07[PATCH] slab: remove kmem_cache_tChristoph Lameter2-4/+4
Replace all uses of kmem_cache_t with struct kmem_cache. The patch was generated using the following script: #!/bin/sh # # Replace one string by another in all the kernel sources. # set -e for file in `find * -name "*.c" -o -name "*.h"|xargs grep -l $1`; do quilt add $file sed -e "1,\$s/$1/$2/g" $file >/tmp/$$ mv /tmp/$$ $file quilt refresh done The script was run like this sh replace kmem_cache_t "struct kmem_cache" Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-12-06JFS: Fix conflicting superblock flagsDave Kleikamp1-21/+21
JFS_NOINTEGRITY and JFS_USRQUOTA are defined to be the same value. Change JFS_NOINTEGRITY to 0x40 and re-order the flags in the header file to avoid repeating this problem. Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
2006-12-04[PATCH] severing fs.h, radix-tree.h -> sched.hAl Viro1-0/+1
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2006-11-30Fix typos in doc and commentsJan Engelhardt1-1/+1
Changes persistant -> persistent. www.dictionary.com does not know persistant (with an A), but should it be one of those things you can spell in more than one correct way, let me know. Signed-off-by: Jan Engelhardt <jengelh@gmx.de> Signed-off-by: Adrian Bunk <bunk@stusta.de>
2006-11-02JFS: Remove redundant xattr permission checkingDave Kleikamp1-4/+5
The vfs handles most permissions for setting and retrieving xattrs. This patch removes a redundant and wrong check so that it won't override the correct behavior which is being fixed in the vfs. Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
2006-10-30jfs: Add splice supportDaniel Drake1-0/+2
This allows the splice() and tee() syscalls to be used with JFS. Signed-off-by: Daniel Drake <ddrake@brontes3d.com> Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
2006-10-13JFS: pageno needs to be longDave Kleikamp1-2/+2
diRead and diWrite are representing the page number as an unsigned int. This causes file system corruption on volumes larger than 16TB. Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
2006-10-02JFS: White space cleanupDave Kleikamp41-510/+508
Removed trailing spaces & tabs, and spaces preceding tabs. Also a couple very minor comment cleanups. Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com> (cherry picked from f74156539964d7b3d5164fdf8848e6a682f75b97 commit)
2006-10-02[PATCH] JFS: return correct error when i-node allocation failedAkinobu Mita5-17/+17
I have seen confusing behavior on JFS when I injected many intentional slab allocation errors. The cp command failed with no disk space error with enough disk space. This patch makes: - change the return value in case slab allocation failures happen from -ENOSPC to -ENOMEM - ialloc() return error code so that the caller can know the reason of failures Signed-off-by: Akinobu Mita <mita@miraclelinux.com> Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com> (cherry picked from 2b46f77976f798f3fe800809a1d0ed38763c71c8 commit)
2006-10-02JFS: Remove shadow variable from fs/jfs/jfs_txnmgr.c:xtLog()Tony Breeds1-2/+0
Signed-off-by: Tony Breeds <tony@bakeyournoodle.com> Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com> (cherry picked from bdc3d9e5af7d9c105be734dd7b5c3f1d9425a15a commit)
2006-10-01[PATCH] r/o bind mounts: monitor zeroing of i_nlinkDave Hansen1-1/+1
Some filesystems, instead of simply decrementing i_nlink, simply zero it during an unlink operation. We need to catch these in addition to the decrement operations. Signed-off-by: Dave Hansen <haveblue@us.ibm.com> Acked-by: Christoph Hellwig <hch@lst.de> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-10-01[PATCH] r/o bind mount prepwork: inc_nlink() helperDave Hansen1-3/+3
This is mostly included for parity with dec_nlink(), where we will have some more hooks. This one should stay pretty darn straightforward for now. Signed-off-by: Dave Hansen <haveblue@us.ibm.com> Acked-by: Christoph Hellwig <hch@lst.de> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-10-01[PATCH] r/o bind mounts: unlink: monitor i_nlinkDave Hansen1-8/+6
When a filesystem decrements i_nlink to zero, it means that a write must be performed in order to drop the inode from the filesystem. We're shortly going to have keep filesystems from being remounted r/o between the time that this i_nlink decrement and that write occurs. So, add a little helper function to do the decrements. We'll tie into it in a bit to note when i_nlink hits zero. Signed-off-by: Dave Hansen <haveblue@us.ibm.com> Acked-by: Christoph Hellwig <hch@lst.de> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-10-01[PATCH] Streamline generic_file_* interfaces and filemap cleanupsBadari Pulavarty1-2/+2
This patch cleans up generic_file_*_read/write() interfaces. Christoph Hellwig gave me the idea for this clean ups. In a nutshell, all filesystems should set .aio_read/.aio_write methods and use do_sync_read/ do_sync_write() as their .read/.write methods. This allows us to cleanup all variants of generic_file_* routines. Final available interfaces: generic_file_aio_read() - read handler generic_file_aio_write() - write handler generic_file_aio_write_nolock() - no lock write handler __generic_file_aio_write_nolock() - internal worker routine Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-10-01[PATCH] Remove readv/writev methods and use aio_read/aio_write insteadBadari Pulavarty1-2/+0
This patch removes readv() and writev() methods and replaces them with aio_read()/aio_write() methods. Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-10-01[PATCH] fs/jfs: Conversion to generic booleanRichard Knutsson11-51/+47
Conversion of booleans to: generic-boolean.patch (2006-08-23) Signed-off-by: Richard Knutsson <ricknu-0@student.ltu.se> Cc: Dave Kleikamp <shaggy@austin.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-09-30[PATCH] BLOCK: Move common FS-specific ioctls to linux/fs.h [try #6]David Howells1-8/+7
Move common FS-specific ioctls from linux/ext2_fs.h to linux/fs.h as FS_IOC_* and FS_IOC32_* and have the users of them use those as a base. Also move the GETFLAGS/SETFLAGS flags to linux/fs.h as FS_*_FL macros, and then have the other users use them as a base. Signed-Off-By: David Howells <dhowells@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2006-09-27[PATCH] inode-diet: Eliminate i_blksize from the inode structureTheodore Ts'o4-4/+2
This eliminates the i_blksize field from struct inode. Filesystems that want to provide a per-inode st_blksize can do so by providing their own getattr routine instead of using the generic_fillattr() function. Note that some filesystems were providing pretty much random (and incorrect) values for i_blksize. [bunk@stusta.de: cleanup] [akpm@osdl.org: generic_fillattr() fix] Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-09-27[PATCH] fs: Removing useless castsPanagiotis Issaris1-2/+2
* Removing useless casts * Removing useless wrapper * Conversion from kmalloc+memset to kzalloc Signed-off-by: Panagiotis Issaris <takis@issaris.org> Acked-by: Dave Kleikamp <shaggy@austin.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-07-28JFS: Fix bug in quota code. tmp_bh.b_size must be initializedDave Kleikamp1-0/+1
Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
2006-07-26JFS: Quota support broken, no quota_read and quota_writeDave Kleikamp3-15/+119
jfs_quota_read/write are very near duplicates of ext2_quota_read/write. Cleaned up jfs_get_block as long as I had to change it to be non-static. Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
2006-07-15Merge branch 'for-linus' of ↵Linus Torvalds2-18/+17
git://git.kernel.org/pub/scm/linux/kernel/git/shaggy/jfs-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/shaggy/jfs-2.6: JFS: commit_mutex cleanups
2006-06-30Remove obsolete #include <linux/config.h>Jörn Engel1-1/+0
Signed-off-by: Jörn Engel <joern@wohnheim.fh-wedel.de> Signed-off-by: Adrian Bunk <bunk@stusta.de>
2006-06-30typo fixes: aquire -> acquireAdrian Bunk1-1/+1
Signed-off-by: Adrian Bunk <bunk@stusta.de> Acked-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2006-06-28[PATCH] mark address_space_operations constChristoph Hellwig4-4/+4
Same as with already do with the file operations: keep them in .rodata and prevents people from doing runtime patching. Signed-off-by: Christoph Hellwig <hch@lst.de> Cc: Steven French <sfrench@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26spelling fixesAndreas Mohr1-4/+4
acquired (aquired) contiguous (contigious) successful (succesful, succesfull) surprise (suprise) whether (weather) some other misspellings Signed-off-by: Andreas Mohr <andi@lisas.de> Signed-off-by: Adrian Bunk <bunk@stusta.de>
2006-06-23[PATCH] read_mapping_page for address spacePekka Enberg1-3/+2
Add read_mapping_page() which is used for callers that pass mapping->a_ops->readpage as the filler for read_cache_page. This removes some duplication from filesystem code. Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-23[PATCH] VFS: Permit filesystem to perform statfs with a known root dentryDavid Howells1-2/+2
Give the statfs superblock operation a dentry pointer rather than a superblock pointer. This complements the get_sb() patch. That reduced the significance of sb->s_root, allowing NFS to place a fake root there. However, NFS does require a dentry to use as a target for the statfs operation. This permits the root in the vfsmount to be used instead. linux/mount.h has been added where necessary to make allyesconfig build successfully. Interest has also been expressed for use with the FUSE and XFS filesystems. Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Al Viro <viro@zeniv.linux.org.uk> Cc: Nathan Scott <nathans@sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-23[PATCH] VFS: Permit filesystem to override root dentry on mountDavid Howells1-3/+4
Extend the get_sb() filesystem operation to take an extra argument that permits the VFS to pass in the target vfsmount that defines the mountpoint. The filesystem is then required to manually set the superblock and root dentry pointers. For most filesystems, this should be done with simple_set_mnt() which will set the superblock pointer and then set the root dentry to the superblock's s_root (as per the old default behaviour). The get_sb() op now returns an integer as there's now no need to return the superblock pointer. This patch permits a superblock to be implicitly shared amongst several mount points, such as can be done with NFS to avoid potential inode aliasing. In such a case, simple_set_mnt() would not be called, and instead the mnt_root and mnt_sb would be set directly. The patch also makes the following changes: (*) the get_sb_*() convenience functions in the core kernel now take a vfsmount pointer argument and return an integer, so most filesystems have to change very little. (*) If one of the convenience function is not used, then get_sb() should normally call simple_set_mnt() to instantiate the vfsmount. This will always return 0, and so can be tail-called from get_sb(). (*) generic_shutdown_super() now calls shrink_dcache_sb() to clean up the dcache upon superblock destruction rather than shrink_dcache_anon(). This is required because the superblock may now have multiple trees that aren't actually bound to s_root, but that still need to be cleaned up. The currently called functions assume that the whole tree is rooted at s_root, and that anonymous dentries are not the roots of trees which results in dentries being left unculled. However, with the way NFS superblock sharing are currently set to be implemented, these assumptions are violated: the root of the filesystem is simply a dummy dentry and inode (the real inode for '/' may well be inaccessible), and all the vfsmounts are rooted on anonymous[*] dentries with child trees. [*] Anonymous until discovered from another tree. (*) The documentation has been adjusted, including the additional bit of changing ext2_* into foo_* in the documentation. [akpm@osdl.org: convert ipath_fs, do other stuff] Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Al Viro <viro@zeniv.linux.org.uk> Cc: Nathan Scott <nathans@sgi.com> Cc: Roland Dreier <rolandd@cisco.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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