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2011-01-18autofs4: clean ->d_release() and autofs4_free_ino() upAl Viro3-19/+16
The latter is called only when both ino and dentry are about to be freed, so cleaning ->d_fsdata and ->dentry is pointless. Acked-by: Ian Kent <raven@themaw.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-01-18autofs4: split autofs4_init_ino()Al Viro3-26/+15
split init_ino into new_ino and clean_ino; the former is what used to be init_ino(NULL, sbi), the latter is for cases where we passed non-NULL ino. Lose unused arguments. Acked-by: Ian Kent <raven@themaw.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-01-18autofs4: mkdir and symlink always get a dentry that had passed lookupAl Viro1-18/+10
... so ->d_fsdata will have been set up before we get there Acked-by: Ian Kent <raven@themaw.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-01-18autofs4: autofs4_get_inode() doesn't need autofs_info * argument anymoreAl Viro3-7/+5
Acked-by: Ian Kent <raven@themaw.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-01-18autofs4: kill ->size in autofs_infoAl Viro3-6/+3
It's used only to pass the length of symlink body to autofs4_get_inode() in autofs4_dir_symlink(). We can bloody well set inode->i_size in autofs4_dir_symlink() directly and be done with that. Acked-by: Ian Kent <raven@themaw.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-01-18autofs4: pass mode to autofs4_get_inode() explicitlyAl Viro3-16/+15
In all cases we'd set inf->mode to know value just before passing it to autofs4_get_inode(). That kills the need to store it in autofs_info and pass it to autofs_init_ino() Acked-by: Ian Kent <raven@themaw.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-01-18autofs4: autofs4_mkroot() is not different from autofs4_init_ino()Al Viro1-12/+1
Kill it. Mind you, it's been an obfuscated call of autofs4_init_ino() ever since 2.3.99pre6-4... Acked-by: Ian Kent <raven@themaw.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-01-18autofs4: keep symlink body in inode->i_privateAl Viro4-28/+9
gets rid of all ->free()/->u.symlink machinery in autofs; we simply keep symlink bodies in inode->i_private and free them in ->evict_inode(). Acked-by: Ian Kent <raven@themaw.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-01-18autofs4 - fix debug print in autofs4_lookup()Ian Kent1-1/+2
oz_mode isn't defined any more, use autofs4_oz_mode(sbi) instead. Signed-off-by: Ian Kent <raven@themaw.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-01-18vfs - fix dentry ref count in do_lookup()Ian Kent1-1/+3
There is a ref count problem in fs/namei.c:do_lookup(). When walking in ref-walk mode, if follow_managed() returns a fail we need to drop dentry and possibly vfsmount. Clean up properly, as we do in the other caller of follow_managed(). Signed-off-by: Ian Kent <raven@themaw.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-01-18autofs4 - fix get_next_positive_dentry()Ian Kent1-2/+2
The initialization condition in fs/autofs4/expire.c:get_next_positive_dentry() appears to be incorrect. If prev == NULL I believe that root should be returned. Further down, at the current dentry check for it being simple_positive() it looks like the d_lock for dentry p should be dropped instead of dentry ret, otherwise when p is assinged to ret we end up with no lock on p and a lost lock on ret, which leads to a deadlock. Signed-off-by: Ian Kent <raven@themaw.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-01-17Merge branch 'for-linus' of ↵Linus Torvalds29-623/+2490
git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable: (25 commits) Btrfs: forced readonly mounts on errors btrfs: Require CAP_SYS_ADMIN for filesystem rebalance Btrfs: don't warn if we get ENOSPC in btrfs_block_rsv_check btrfs: Fix memory leak in btrfs_read_fs_root_no_radix() btrfs: check NULL or not btrfs: Don't pass NULL ptr to func that may deref it. btrfs: mount failure return value fix btrfs: Mem leak in btrfs_get_acl() btrfs: fix wrong free space information of btrfs btrfs: make the chunk allocator utilize the devices better btrfs: restructure find_free_dev_extent() btrfs: fix wrong calculation of stripe size btrfs: try to reclaim some space when chunk allocation fails btrfs: fix wrong data space statistics fs/btrfs: Fix build of ctree Btrfs: fix off by one while setting block groups readonly Btrfs: Add BTRFS_IOC_SUBVOL_GETFLAGS/SETFLAGS ioctls Btrfs: Add readonly snapshots support Btrfs: Refactor btrfs_ioctl_snap_create() btrfs: Extract duplicate decompress code ...
2011-01-17Merge branch 'for-linus' of ↵Linus Torvalds7-80/+82
git://git.kernel.org/pub/scm/linux/kernel/git/ecryptfs/ecryptfs-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ecryptfs/ecryptfs-2.6: ecryptfs: remove unnecessary decrypt when extending a file ecryptfs: Fix ecryptfs_printk() size_t warnings fs/ecryptfs: Add printf format/argument verification and fix fallout ecryptfs: fixed testing of file descriptor flags ecryptfs: test lower_file pointer when lower_file_mutex is locked ecryptfs: missing initialization of the superblock 'magic' field ecryptfs: moved ECRYPTFS_SUPER_MAGIC definition to linux/magic.h ecryptfs: fix truncation error in ecryptfs_read_update_atime
2011-01-17xfs: Do not name variables "panic"Geert Uytterhoeven1-3/+3
On platforms that call panic() inside their BUG() macro (m68k/sun3, and all platforms that don't set HAVE_ARCH_BUG), compilation fails with: | fs/xfs/support/debug.c: In function ‘xfs_cmn_err’: | fs/xfs/support/debug.c:92: error: called object ‘panic’ is not a function as the local variable "panic" conflicts with the "panic()" function. Rename the local variable to resolve this. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-01-17Btrfs: forced readonly mounts on errorsliubo7-2/+523
This patch comes from "Forced readonly mounts on errors" ideas. As we know, this is the first step in being more fault tolerant of disk corruptions instead of just using BUG() statements. The major content: - add a framework for generating errors that should result in filesystems going readonly. - keep FS state in disk super block. - make sure that all of resource will be freed and released at umount time. - make sure that fter FS is forced readonly on error, there will be no more disk change before FS is corrected. For this, we should stop write operation. After this patch is applied, the conversion from BUG() to such a framework can happen incrementally. Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
2011-01-17Merge git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6Linus Torvalds2-2/+4
* git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6: cifs: add cruid= mount option cifs: cFYI the entire error code in map_smb_to_linux_error
2011-01-17Merge git://git.infradead.org/mtd-2.6Linus Torvalds3-10/+9
* git://git.infradead.org/mtd-2.6: (59 commits) mtd: mtdpart: disallow reading OOB past the end of the partition mtd: pxa3xx_nand: NULL dereference in pxa3xx_nand_probe UBI: use mtd->writebufsize to set minimal I/O unit size mtd: initialize writebufsize in the MTD object of a partition mtd: onenand: add mtd->writebufsize initialization mtd: nand: add mtd->writebufsize initialization mtd: cfi: add writebufsize initialization mtd: add writebufsize field to mtd_info struct mtd: OneNAND: OMAP2/3: prevent regulator sleeping while OneNAND is in use mtd: OneNAND: add enable / disable methods to onenand_chip mtd: m25p80: Fix JEDEC ID for AT26DF321 mtd: txx9ndfmc: limit transfer bytes to 512 (ECC provides 6 bytes max) mtd: cfi_cmdset_0002: add support for Samsung K8D3x16UxC NOR chips mtd: cfi_cmdset_0002: add support for Samsung K8D6x16UxM NOR chips mtd: nand: ams-delta: drop omap_read/write, use ioremap mtd: m25p80: add debugging trace in sst_write mtd: nand: ams-delta: select for built-in by default mtd: OneNAND: lighten scary initial bad block messages mtd: OneNAND: OMAP2/3: add support for command line partitioning mtd: nand: rearrange ONFI revision checking, add ONFI 2.3 ... Fix up trivial conflict in drivers/mtd/Kconfig as per DavidW.
2011-01-17ecryptfs: remove unnecessary decrypt when extending a fileFrank Swiderski1-8/+14
Removes an unecessary page decrypt from ecryptfs_begin_write when the page is beyond the current file size. Previously, the call to ecryptfs_decrypt_page would result in a read of 0 bytes, but still attempt to decrypt an entire page. This patch detects that case and merely zeros the page before marking it up-to-date. Signed-off-by: Frank Swiderski <fes@chromium.org> Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
2011-01-17ecryptfs: Fix ecryptfs_printk() size_t warningsTyler Hicks2-12/+12
Commit cb55d21f6fa19d8c6c2680d90317ce88c1f57269 revealed a number of missing 'z' length modifiers in calls to ecryptfs_printk() when printing variables of type size_t. This patch fixes those compiler warnings. Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
2011-01-17fs/ecryptfs: Add printf format/argument verification and fix falloutJoe Perches6-29/+30
Add __attribute__((format... to __ecryptfs_printk Make formats and arguments match. Add casts to (unsigned long long) for %llu. Signed-off-by: Joe Perches <joe@perches.com> [tyhicks: 80 columns cleanup and fixed typo] Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
2011-01-17ecryptfs: fixed testing of file descriptor flagsRoberto Sassu1-2/+2
This patch replaces the check (lower_file->f_flags & O_RDONLY) with ((lower_file & O_ACCMODE) == O_RDONLY). Signed-off-by: Roberto Sassu <roberto.sassu@polito.it> Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
2011-01-17ecryptfs: test lower_file pointer when lower_file_mutex is lockedRoberto Sassu2-27/+21
This patch prevents the lower_file pointer in the 'ecryptfs_inode_info' structure to be checked when the mutex 'lower_file_mutex' is not locked. Signed-off-by: Roberto Sassu <roberto.sassu@polito.it> Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
2011-01-17ecryptfs: missing initialization of the superblock 'magic' fieldRoberto Sassu1-0/+2
This patch initializes the 'magic' field of ecryptfs filesystems to ECRYPTFS_SUPER_MAGIC. Signed-off-by: Roberto Sassu <roberto.sassu@polito.it> [tyhicks: merge with 66cb76666d69] Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
2011-01-17ecryptfs: moved ECRYPTFS_SUPER_MAGIC definition to linux/magic.hRoberto Sassu1-1/+0
The definition of ECRYPTFS_SUPER_MAGIC has been moved to the include file 'linux/magic.h' to become available to other kernel subsystems. Signed-off-by: Roberto Sassu <roberto.sassu@polito.it> Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
2011-01-17ecryptfs: fix truncation error in ecryptfs_read_update_atimeEdward Shishkin1-1/+1
This is similar to the bug found in direct-io not so long ago. Fix up truncation (ssize_t->int). This only matters with >2G reads/writes, which the kernel doesn't permit. Signed-off-by: Edward Shishkin <edward.shishkin@gmail.com> Cc: Jeff Moyer <jmoyer@redhat.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Eric Sandeen <esandeen@redhat.com> Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
2011-01-17fs: fix address space warnings in ioctl_fiemap()Namhyung Kim1-5/+5
The fi_extents_start field of struct fiemap_extent_info is a user pointer but was not marked as __user. This makes sparse emit following warnings: CHECK fs/ioctl.c fs/ioctl.c:114:26: warning: incorrect type in argument 1 (different address spaces) fs/ioctl.c:114:26: expected void [noderef] <asn:1>*dst fs/ioctl.c:114:26: got struct fiemap_extent *[assigned] dest fs/ioctl.c:202:14: warning: incorrect type in argument 1 (different address spaces) fs/ioctl.c:202:14: expected void const volatile [noderef] <asn:1>*<noident> fs/ioctl.c:202:14: got struct fiemap_extent *[assigned] fi_extents_start fs/ioctl.c:212:27: warning: incorrect type in argument 1 (different address spaces) fs/ioctl.c:212:27: expected void [noderef] <asn:1>*dst fs/ioctl.c:212:27: got char *<noident> Also add 'ufiemap' variable to eliminate unnecessary casts. Signed-off-by: Namhyung Kim <namhyung@gmail.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-01-17aio: check return value of create_workqueue()Namhyung Kim1-1/+1
Signed-off-by: Namhyung Kim <namhyung@gmail.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-01-17hpfs_setattr error case avoids unlock_kernelDr. David Alan Gilbert1-1/+1
This fixed a case that 'sparse' spotted where hpfs_setattr has an error return that didn't go through it's path that unlocks. This is against git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git version 6313e3c21743cc88bb5bd8aa72948ee1e83937b6. Build tested only, I don't have an hpfs file system to test. Dave Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-01-17compat: copy missing fields in compat_statfs64 to userNamhyung Kim1-1/+3
f_flags and f_spare fields were not copied to userspace when compat_sys_[f]statfs64 called. Signed-off-by: Namhyung Kim <namhyung@gmail.com> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-01-17compat: update comment of compat statfs syscallsNamhyung Kim1-1/+1
The commit 7ed1ee6118ae ("Take statfs variants to fs/statfs.c") separates out statfs syscalls from fs/open.c. Thus the comment should be changed also. Signed-off-by: Namhyung Kim <namhyung@gmail.com> Cc: Jiri Kosina <trivial@kernel.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-01-17compat: remove unnecessary assignment in compat_rw_copy_check_uvector()Namhyung Kim1-3/+1
*@ret_pointer is initialized to @fast_pointer thus the assignment is redundant. Signed-off-by: Namhyung Kim <namhyung@gmail.com> Cc: Jeff Moyer <jmoyer@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-01-17fs: FS_POSIX_ACL does not depend on BLOCKRandy Dunlap1-9/+8
- Fix a kconfig unmet dependency warning. - Remove the comment that identifies which filesystems use POSIX ACL utility routines. - Move the FS_POSIX_ACL symbol outside of the BLOCK symbol if/endif block because its functions do not depend on BLOCK and some of the filesystems that use it do not depend on BLOCK. warning: (GENERIC_ACL && JFFS2_FS_POSIX_ACL && NFSD_V4 && NFS_ACL_SUPPORT && 9P_FS_POSIX_ACL) selects FS_POSIX_ACL which has unmet direct dependencies (BLOCK) Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-01-17fs: Remove unlikely() from fget_light()Steven Rostedt1-1/+1
There's an unlikely() in fget_light() that assumes the file ref count will be 1. Running the annotate branch profiler on a desktop that is performing daily tasks (running firefox, evolution, xchat and is also part of a distcc farm), it shows that the ref count is not 1 that often. correct incorrect % Function File Line ------- --------- - -------- ---- ---- 1035099358 6209599193 85 fget_light file_table.c 315 Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-01-17fallocate should be a file operationChristoph Hellwig11-444/+437
Currently all filesystems except XFS implement fallocate asynchronously, while XFS forced a commit. Both of these are suboptimal - in case of O_SYNC I/O we really want our allocation on disk, especially for the !KEEP_SIZE case where we actually grow the file with user-visible zeroes. On the other hand always commiting the transaction is a bad idea for fast-path uses of fallocate like for example in recent Samba versions. Given that block allocation is a data plane operation anyway change it from an inode operation to a file operation so that we have the file structure available that lets us check for O_SYNC. This also includes moving the code around for a few of the filesystems, and remove the already unnedded S_ISDIR checks given that we only wire up fallocate for regular files. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-01-17make the feature checks in ->fallocate future proofChristoph Hellwig5-3/+8
Instead of various home grown checks that might need updates for new flags just check for any bit outside the mask of the features supported by the filesystem. This makes the check future proof for any newly added flag. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-01-17tidy up around finish_automount()Al Viro2-30/+18
do_add_mount() and mnt_clear_expiry() are not needed outside of namespace.c anymore, now that namei has finish_automount() to use. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-01-17don't drop newmnt on error in do_add_mount()Al Viro1-11/+5
That gets rid of the kludge in finish_automount() - we need to keep refcount on the vfsmount as-is until we evict it from expiry list. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-01-17Take the completion of automount into new helperAl Viro3-26/+39
... and shift it from namei.c to namespace.c Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-01-16Merge branch 'for-linus' of ↵Linus Torvalds3-6/+4
git://git.kernel.org/pub/scm/linux/kernel/git/nab/scsi-post-merge-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/scsi-post-merge-2.6: ocfs2: Make OCFS2_FS depend on CONFIGFS_FS dlm: Make DLM depend on CONFIGFS_FS net: Make NETCONSOLE_DYNAMIC depend on CONFIGFS_FS configfs: change depends -> select SYSFS [SCSI] sd,sr: kill compat SDEV_MEDIA_CHANGE event [SCSI] sd: implement sd_check_events()
2011-01-16VFS: Fix UP compile error in fs/namespace.cAl Viro1-7/+24
mnt_longterm is there only on SMP Reported-and-tested-by: Joachim Eastwood <manabian@gmail.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-01-16ocfs2: Make OCFS2_FS depend on CONFIGFS_FSNicholas Bellinger1-2/+1
This patch fixes the following kconfig error after changing CONFIGFS_FS -> select SYSFS: fs/sysfs/Kconfig:1:error: recursive dependency detected! fs/sysfs/Kconfig:1: symbol SYSFS is selected by CONFIGFS_FS fs/configfs/Kconfig:1: symbol CONFIGFS_FS is selected by OCFS2_FS fs/ocfs2/Kconfig:1: symbol OCFS2_FS depends on SYSFS Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org> Cc: Joel Becker <jlbec@evilplan.org> Cc: Randy Dunlap <randy.dunlap@oracle.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: James Bottomley <James.Bottomley@suse.de>
2011-01-16dlm: Make DLM depend on CONFIGFS_FSNicholas Bellinger1-2/+1
This patch fixes the following kconfig error after changing CONFIGFS_FS -> select SYSFS: fs/sysfs/Kconfig:1:error: recursive dependency detected! fs/sysfs/Kconfig:1: symbol SYSFS is selected by CONFIGFS_FS fs/configfs/Kconfig:1: symbol CONFIGFS_FS is selected by DLM fs/dlm/Kconfig:1: symbol DLM depends on SYSFS Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org> Cc: Joel Becker <jlbec@evilplan.org> Cc: Randy Dunlap <randy.dunlap@oracle.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: James Bottomley <James.Bottomley@suse.de>
2011-01-16configfs: change depends -> select SYSFSNicholas Bellinger1-2/+2
This patch changes configfs to select SYSFS to fix the following: warning: (TARGET_CORE && GFS2_FS) selects CONFIGFS_FS which has unmet direct dependencies (SYSFS) Reported-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org> Acked-by: Joel Becker <jlbec@evilplan.org>
2011-01-16fs/btrfs: Fix build of ctreeStefan Schmidt1-0/+1
Fix the build failure in some configurations: CC [M] fs/btrfs/ctree.o In file included from fs/btrfs/ctree.c:21:0: fs/btrfs/ctree.h:1003:17: error: field 'super_kobj' has incomplete type fs/btrfs/ctree.h:1074:17: error: field 'root_kobj' has incomplete type make[2]: *** [fs/btrfs/ctree.o] Error 1 make[1]: *** [fs/btrfs] Error 2 make: *** [fs] Error 2 caused by commit 57cc7215b708 ("headers: kobject.h redux") We need to include kobject.h here. Reported-by: Jeff Garzik <jeff@garzik.org> Fix-suggested-by: Li Zefan <lizf@cn.fujitsu.com> Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-01-16Merge git://git.kernel.org/pub/scm/linux/kernel/git/pkl/squashfs-linusLinus Torvalds15-30/+203
* git://git.kernel.org/pub/scm/linux/kernel/git/pkl/squashfs-linus: Squashfs: simplify CONFIG_SQUASHFS_LZO handling Squashfs: move squashfs_i() definition from squashfs.h Squashfs: get rid of default n in Kconfig Squashfs: add missing check in zlib_wrapper Squashfs: remove unnecessary variable in zlib_wrapper Squashfs: Add XZ compression configuration option Squashfs: add XZ compression support
2011-01-16Merge branch 'for-linus' of ↵Linus Torvalds28-834/+935
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: (23 commits) sanitize vfsmount refcounting changes fix old umount_tree() breakage autofs4: Merge the remaining dentry ops tables Unexport do_add_mount() and add in follow_automount(), not ->d_automount() Allow d_manage() to be used in RCU-walk mode Remove a further kludge from __do_follow_link() autofs4: Bump version autofs4: Add v4 pseudo direct mount support autofs4: Fix wait validation autofs4: Clean up autofs4_free_ino() autofs4: Clean up dentry operations autofs4: Clean up inode operations autofs4: Remove unused code autofs4: Add d_manage() dentry operation autofs4: Add d_automount() dentry operation Remove the automount through follow_link() kludge code from pathwalk CIFS: Use d_automount() rather than abusing follow_link() NFS: Use d_automount() rather than abusing follow_link() AFS: Use d_automount() rather than abusing follow_link() Add an AT_NO_AUTOMOUNT flag to suppress terminal automount ...
2011-01-16sanitize vfsmount refcounting changesAl Viro7-111/+73
Instead of splitting refcount between (per-cpu) mnt_count and (SMP-only) mnt_longrefs, make all references contribute to mnt_count again and keep track of how many are longterm ones. Accounting rules for longterm count: * 1 for each fs_struct.root.mnt * 1 for each fs_struct.pwd.mnt * 1 for having non-NULL ->mnt_ns * decrement to 0 happens only under vfsmount lock exclusive That allows nice common case for mntput() - since we can't drop the final reference until after mnt_longterm has reached 0 due to the rules above, mntput() can grab vfsmount lock shared and check mnt_longterm. If it turns out to be non-zero (which is the common case), we know that this is not the final mntput() and can just blindly decrement percpu mnt_count. Otherwise we grab vfsmount lock exclusive and do usual decrement-and-check of percpu mnt_count. For fs_struct.c we have mnt_make_longterm() and mnt_make_shortterm(); namespace.c uses the latter in places where we don't already hold vfsmount lock exclusive and opencodes a few remaining spots where we need to manipulate mnt_longterm. Note that we mostly revert the code outside of fs/namespace.c back to what we used to have; in particular, normal code doesn't need to care about two kinds of references, etc. And we get to keep the optimization Nick's variant had bought us... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-01-16fix old umount_tree() breakageAl Viro1-3/+5
Expiry-related code calls umount_tree() several times with the same list to collect vfsmounts to. Which is fine, except that umount_tree() implicitly assumed that the list would be empty on each call - it moves the victims over there and then iterates through the list kicking them out. It's *almost* idempotent, so everything nearly worked. However, mnt->ghosts handling (and thus expirability checks) had been broken - that part was not idempotent... The fix is trivial - use local temporary list, splice it to the the collector list when we are through. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-01-16btrfs: Require CAP_SYS_ADMIN for filesystem rebalanceBen Hutchings1-0/+4
Filesystem rebalancing (BTRFS_IOC_BALANCE) affects the entire filesystem and may run uninterruptibly for a long time. This does not seem to be something that an unprivileged user should be able to do. Reported-by: Aron Xu <happyaron.xu@gmail.com> Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: Chris Mason <chris.mason@oracle.com>
2011-01-16Btrfs: don't warn if we get ENOSPC in btrfs_block_rsv_checkJosef Bacik1-5/+0
If we run low on space we could get a bunch of warnings out of btrfs_block_rsv_check, but this is mostly just called via the transaction code to see if we need to end the transaction, it expects to see failures, so let's not WARN and freak everybody out for no reason. Thanks, Signed-off-by: Josef Bacik <josef@redhat.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
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