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2015-04-26Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull fourth vfs update from Al Viro: "d_inode() annotations from David Howells (sat in for-next since before the beginning of merge window) + four assorted fixes" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: RCU pathwalk breakage when running into a symlink overmounting something fix I_DIO_WAKEUP definition direct-io: only inc/dec inode->i_dio_count for file systems fs/9p: fix readdir() VFS: assorted d_backing_inode() annotations VFS: fs/inode.c helpers: d_inode() annotations VFS: fs/cachefiles: d_backing_inode() annotations VFS: fs library helpers: d_inode() annotations VFS: assorted weird filesystems: d_inode() annotations VFS: normal filesystems (and lustre): d_inode() annotations VFS: security/: d_inode() annotations VFS: security/: d_backing_inode() annotations VFS: net/: d_inode() annotations VFS: net/unix: d_backing_inode() annotations VFS: kernel/: d_inode() annotations VFS: audit: d_backing_inode() annotations VFS: Fix up some ->d_inode accesses in the chelsio driver VFS: Cachefiles should perform fs modifications on the top layer only VFS: AF_UNIX sockets should call mknod on the top layer only
2015-04-15VFS: fs library helpers: d_inode() annotationsDavid Howells
library helpers called by filesystem drivers on their own inodes Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-03-18vfs: Add general support to enforce project quota limitsLi Xi
This patch adds support for a new quota type PRJQUOTA for project quota enforcement. Also a new method get_projid() is added into dquot_operations structure. Signed-off-by: Li Xi <lixi@ddn.com> Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org> Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Jan Kara <jack@suse.cz>
2015-03-16Merge branch 'quota_interface' into for_next_testingJan Kara
2015-03-04quota: optimize i_dquot accessKonstantin Khlebnikov
Remove redundant calls of i_dquot(), keep pointer in local variable. add/remove: 0/0 grow/shrink: 3/7 up/down: 40/-278 (-238) function old new delta __dquot_free_space 734 750 +16 __dquot_alloc_space 484 500 +16 dquot_free_inode 324 332 +8 dquot_drop 82 69 -13 vfs_load_quota_inode 1357 1341 -16 dquot_reclaim_space_nodirty 348 316 -32 dquot_disable 1980 1944 -36 dquot_claim_space_nodirty 354 314 -40 __dquot_drop 125 83 -42 __dquot_initialize 522 423 -99 Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Signed-off-by: Jan Kara <jack@suse.cz>
2015-03-04quota: Make ->set_info use structure with neccesary info to VFS and XFSJan Kara
Change ->set_info to take new qc_info structure which contains all the necessary information both for XFS and VFS. Convert Q_SETINFO handler to use this structure. Signed-off-by: Jan Kara <jack@suse.cz>
2015-03-04quota: Make VFS quotas use new interface for getting quota infoJan Kara
Create new internal interface for getting information about quota which contains everything needed for both VFS quotas and XFS quotas. Make VFS use this and hook it up to Q_GETINFO. Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jan Kara <jack@suse.cz>
2015-01-30quota: Store maximum space limit in bytesJan Kara
Currently maximum space limit quota format supports is in blocks however since we store space limits in bytes, this is somewhat confusing. So store the maximum limit in bytes as well. Also rename the field to match the new unit and related inode field to match the new naming scheme. Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jan Kara <jack@suse.cz>
2015-01-30quota: Add ->quota_{enable,disable} callbacks for VFS quotasJan Kara
Add functions which translate ->quota_enable / ->quota_disable calls into appropriate changes in VFS quota. This will enable filesystems supporting VFS quota files in system inodes to be controlled via Q_XQUOTA[ON|OFF] quotactls for better userspace compatibility. Also provide a vector for quotactl using these functions which can be used by filesystems with quota files stored in hidden system files. Signed-off-by: Jan Kara <jack@suse.cz>
2015-01-30Merge branch 'for_linus' into for_nextJan Kara
2015-01-28quota: Switch ->get_dqblk() and ->set_dqblk() to use bytes as space unitsJan Kara
Currently ->get_dqblk() and ->set_dqblk() use struct fs_disk_quota which tracks space limits and usage in 512-byte blocks. However VFS quotas track usage in bytes (as some filesystems require that) and we need to somehow pass this information. Upto now it wasn't a problem because we didn't do any unit conversion (thus VFS quota routines happily stuck number of bytes into d_bcount field of struct fd_disk_quota). Only if you tried to use Q_XGETQUOTA or Q_XSETQLIM for VFS quotas (or Q_GETQUOTA / Q_SETQUOTA for XFS quotas), you got bogus results. Hardly anyone tried this but reportedly some Samba users hit the problem in practice. So when we want interfaces compatible we need to fix this. We bite the bullet and define another quota structure used for passing information from/to ->get_dqblk()/->set_dqblk. It's somewhat sad we have to have more conversion routines in fs/quota/quota.c and another copying of quota structure slows down getting of quota information by about 2% but it seems cleaner than overloading e.g. units of d_bcount to bytes. CC: stable@vger.kernel.org Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jan Kara <jack@suse.cz>
2015-01-21quota: Verify flags passed to Q_SETINFOJan Kara
Currently flags passed via Q_SETINFO were just stored. This makes it hard to add new flags since in theory userspace could be just setting / clearing random flags. Since currently there is only one userspace settable flag and that is somewhat obscure flags only for ancient v1 quota format, I'm reasonably sure noone operates these flags and hopefully we are fine just adding the check that passed flags are sane. If we indeed find some userspace program that gets broken by the strict check, we can always remove it again. Signed-off-by: Jan Kara <jack@suse.cz>
2015-01-21quota: Cleanup flags definitionsJan Kara
Currently all quota flags were defined just in kernel-private headers. Export flags readable / writeable from userspace to userspace via include/uapi/linux/quota.h. Signed-off-by: Jan Kara <jack@suse.cz>
2014-11-10vfs: Remove i_dquot field from inodeJan Kara
All filesystems using VFS quotas are now converted to use their private i_dquot fields. Remove the i_dquot field from generic inode structure. Acked-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jan Kara <jack@suse.cz>
2014-11-10quota: Use function to provide i_dquot pointersJan Kara
i_dquot array is used by relatively few filesystems (ext?, ocfs2, jfs, reiserfs) so it is beneficial to move this array to fs-private part of the inode. We cannot just pass quota pointers from filesystems to quota functions because during quotaon and quotaoff we have to traverse list of all inodes and manipulate i_dquot pointers for each inode. So we provide a function which generic quota code can use to get pointer to the i_dquot array from the filesystem. Acked-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jan Kara <jack@suse.cz>
2014-11-10quota: Remove const from function declarationsJan Kara
We don't use const through VFS too much so just remove it from quota function declarations. Signed-off-by: Jan Kara <jack@suse.cz>
2014-11-04quota: Add log level to printkAnton Blanchard
JK: Added VFS: prefix to the message when changing it to make it more standard. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Jan Kara <jack@suse.cz>
2014-10-22quota: Properly return errors from dquot_writeback_dquots()Jan Kara
Due to a switched left and right side of an assignment, dquot_writeback_dquots() never returned error. This could result in errors during quota writeback to not be reported to userspace properly. Fix it. CC: stable@vger.kernel.org Coverity-id: 1226884 Signed-off-by: Jan Kara <jack@suse.cz>
2014-09-08percpu_counter: add @gfp to percpu_counter_init()Tejun Heo
Percpu allocator now supports allocation mask. Add @gfp to percpu_counter_init() so that !GFP_KERNEL allocation masks can be used with percpu_counters too. We could have left percpu_counter_init() alone and added percpu_counter_init_gfp(); however, the number of users isn't that high and introducing _gfp variants to all percpu data structures would be quite ugly, so let's just do the conversion. This is the one with the most users. Other percpu data structures are a lot easier to convert. This patch doesn't make any functional difference. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Jan Kara <jack@suse.cz> Acked-by: "David S. Miller" <davem@davemloft.net> Cc: x86@kernel.org Cc: Jens Axboe <axboe@kernel.dk> Cc: "Theodore Ts'o" <tytso@mit.edu> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Andrew Morton <akpm@linux-foundation.org>
2014-07-15quota: remove dqptr_semNiu Yawei
Remove dqptr_sem to make quota code scalable: Remove the dqptr_sem, accessing inode->i_dquot now protected by dquot_srcu, and changing inode->i_dquot is now serialized by dq_data_lock. Signed-off-by: Lai Siyao <lai.siyao@intel.com> Signed-off-by: Niu Yawei <yawei.niu@intel.com> Signed-off-by: Jan Kara <jack@suse.cz>
2014-07-15quota: simplify remove_inode_dquot_ref()Niu Yawei
Simplify the remove_inode_dquot_ref() to make it more obvious that now we keep one reference for each dquot from inodes. Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Niu Yawei <yawei.niu@intel.com> Signed-off-by: Jan Kara <jack@suse.cz>
2014-07-15quota: avoid unnecessary dqget()/dqput() callsNiu Yawei
Avoid unnecessary dqget()/dqput() calls in __dquot_initialize(), that will introduce global lock contention otherwise. Signed-off-by: Lai Siyao <lai.siyao@intel.com> Signed-off-by: Niu Yawei <yawei.niu@intel.com> Signed-off-by: Jan Kara <jack@suse.cz>
2014-07-15quota: missing lock in dqcache_shrink_scan()Niu Yawei
Commit 1ab6c4997e04 (fs: convert fs shrinkers to new scan/count API) accidentally removed locking from quota shrinker. Fix it - dqcache_shrink_scan() should use dq_list_lock to protect the scan on free_dquots list. CC: stable@vger.kernel.org Fixes: 1ab6c4997e04a00c50c6d786c2f046adc0d1f5de Signed-off-by: Niu Yawei <yawei.niu@intel.com> Signed-off-by: Jan Kara <jack@suse.cz>
2014-04-03quota: provide function to grab quota structure referenceJan Kara
Provide dqgrab() function to get quota structure reference when we are sure it already has at least one active reference. Make use of this function inside quota code. Signed-off-by: Jan Kara <jack@suse.cz> Reviewed-by: Mark Fasheh <mfasheh@suse.de> Reviewed-by: Srinivas Eeda <srinivas.eeda@oracle.com> Cc: Joel Becker <jlbec@evilplan.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-02-20quota: Fix race between dqput() and dquot_scan_active()Jan Kara
Currently last dqput() can race with dquot_scan_active() causing it to call callback for an already deactivated dquot. The race is as follows: CPU1 CPU2 dqput() spin_lock(&dq_list_lock); if (atomic_read(&dquot->dq_count) > 1) { - not taken if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { spin_unlock(&dq_list_lock); ->release_dquot(dquot); if (atomic_read(&dquot->dq_count) > 1) - not taken dquot_scan_active() spin_lock(&dq_list_lock); if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) - not taken atomic_inc(&dquot->dq_count); spin_unlock(&dq_list_lock); - proceeds to release dquot ret = fn(dquot, priv); - called for inactive dquot Fix the problem by making sure possible ->release_dquot() is finished by the time we call the callback and new calls to it will notice reference dquot_scan_active() has taken and bail out. CC: stable@vger.kernel.org # >= 2.6.29 Signed-off-by: Jan Kara <jack@suse.cz>
2013-09-10fs: convert fs shrinkers to new scan/count APIDave Chinner
Convert the filesystem shrinkers to use the new API, and standardise some of the behaviours of the shrinkers at the same time. For example, nr_to_scan means the number of objects to scan, not the number of objects to free. I refactored the CIFS idmap shrinker a little - it really needs to be broken up into a shrinker per tree and keep an item count with the tree root so that we don't need to walk the tree every time the shrinker needs to count the number of objects in the tree (i.e. all the time under memory pressure). [glommer@openvz.org: fixes for ext4, ubifs, nfs, cifs and glock. Fixes are needed mainly due to new code merged in the tree] [assorted fixes folded in] Signed-off-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Glauber Costa <glommer@openvz.org> Acked-by: Mel Gorman <mgorman@suse.de> Acked-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Acked-by: Jan Kara <jack@suse.cz> Acked-by: Steven Whitehouse <swhiteho@redhat.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: "Theodore Ts'o" <tytso@mit.edu> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Cc: Arve Hjønnevåg <arve@android.com> Cc: Carlos Maiolino <cmaiolino@redhat.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Chuck Lever <chuck.lever@oracle.com> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: David Rientjes <rientjes@google.com> Cc: Gleb Natapov <gleb@redhat.com> Cc: Greg Thelen <gthelen@google.com> Cc: J. Bruce Fields <bfields@redhat.com> Cc: Jan Kara <jack@suse.cz> Cc: Jerome Glisse <jglisse@redhat.com> Cc: John Stultz <john.stultz@linaro.org> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Kent Overstreet <koverstreet@google.com> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Marcelo Tosatti <mtosatti@redhat.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Steven Whitehouse <swhiteho@redhat.com> Cc: Thomas Hellstrom <thellstrom@vmware.com> Cc: Trond Myklebust <Trond.Myklebust@netapp.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-09-10super: fix calculation of shrinkable objects for small numbersGlauber Costa
The sysctl knob sysctl_vfs_cache_pressure is used to determine which percentage of the shrinkable objects in our cache we should actively try to shrink. It works great in situations in which we have many objects (at least more than 100), because the aproximation errors will be negligible. But if this is not the case, specially when total_objects < 100, we may end up concluding that we have no objects at all (total / 100 = 0, if total < 100). This is certainly not the biggest killer in the world, but may matter in very low kernel memory situations. Signed-off-by: Glauber Costa <glommer@openvz.org> Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Acked-by: Mel Gorman <mgorman@suse.de> Cc: Dave Chinner <david@fromorbit.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: "Theodore Ts'o" <tytso@mit.edu> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Cc: Arve Hjønnevåg <arve@android.com> Cc: Carlos Maiolino <cmaiolino@redhat.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Chuck Lever <chuck.lever@oracle.com> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: David Rientjes <rientjes@google.com> Cc: Gleb Natapov <gleb@redhat.com> Cc: Greg Thelen <gthelen@google.com> Cc: J. Bruce Fields <bfields@redhat.com> Cc: Jan Kara <jack@suse.cz> Cc: Jerome Glisse <jglisse@redhat.com> Cc: John Stultz <john.stultz@linaro.org> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Kent Overstreet <koverstreet@google.com> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Marcelo Tosatti <mtosatti@redhat.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Steven Whitehouse <swhiteho@redhat.com> Cc: Thomas Hellstrom <thellstrom@vmware.com> Cc: Trond Myklebust <Trond.Myklebust@netapp.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-08-17quota: provide interface for readding allocated space into reserved spaceJan Kara
ext4 needs to convert allocated (metadata) blocks back into blocks reserved for delayed allocation. Add functions into quota code for supporting such operation. Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2013-07-04quota: Convert use of typedef ctl_table to struct ctl_tableJoe Perches
This typedef is unnecessary and should just be removed. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Jan Kara <jack@suse.cz>
2013-03-11quota: add missing use of dq_data_lock in __dquot_initializeJeff Mahoney
The bulk of __dquot_initialize runs under the dqptr_sem which protects the inode->i_dquot pointers. It doesn't protect the dereferenced contents, though. Those are protected by the dq_data_lock, which is missing around the dquot_resv_space call. Signed-off-by: Jeff Mahoney <jeffm@suse.com> Signed-off-by: Jan Kara <jack@suse.cz>
2012-10-09quota: Silence warning about PRJQUOTA not being handled in need_print_warning()Jan Kara
PRJQUOTA value of quota type should never reach need_print_warning() since XFS (which is the only fs which uses that type) doesn't use generic functions calling this function. Anyway, add PRJQUOTA case to the switch to make gcc happy. Signed-off-by: Jan Kara <jack@suse.cz>
2012-10-02Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace Pull user namespace changes from Eric Biederman: "This is a mostly modest set of changes to enable basic user namespace support. This allows the code to code to compile with user namespaces enabled and removes the assumption there is only the initial user namespace. Everything is converted except for the most complex of the filesystems: autofs4, 9p, afs, ceph, cifs, coda, fuse, gfs2, ncpfs, nfs, ocfs2 and xfs as those patches need a bit more review. The strategy is to push kuid_t and kgid_t values are far down into subsystems and filesystems as reasonable. Leaving the make_kuid and from_kuid operations to happen at the edge of userspace, as the values come off the disk, and as the values come in from the network. Letting compile type incompatible compile errors (present when user namespaces are enabled) guide me to find the issues. The most tricky areas have been the places where we had an implicit union of uid and gid values and were storing them in an unsigned int. Those places were converted into explicit unions. I made certain to handle those places with simple trivial patches. Out of that work I discovered we have generic interfaces for storing quota by projid. I had never heard of the project identifiers before. Adding full user namespace support for project identifiers accounts for most of the code size growth in my git tree. Ultimately there will be work to relax privlige checks from "capable(FOO)" to "ns_capable(user_ns, FOO)" where it is safe allowing root in a user names to do those things that today we only forbid to non-root users because it will confuse suid root applications. While I was pushing kuid_t and kgid_t changes deep into the audit code I made a few other cleanups. I capitalized on the fact we process netlink messages in the context of the message sender. I removed usage of NETLINK_CRED, and started directly using current->tty. Some of these patches have also made it into maintainer trees, with no problems from identical code from different trees showing up in linux-next. After reading through all of this code I feel like I might be able to win a game of kernel trivial pursuit." Fix up some fairly trivial conflicts in netfilter uid/git logging code. * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace: (107 commits) userns: Convert the ufs filesystem to use kuid/kgid where appropriate userns: Convert the udf filesystem to use kuid/kgid where appropriate userns: Convert ubifs to use kuid/kgid userns: Convert squashfs to use kuid/kgid where appropriate userns: Convert reiserfs to use kuid and kgid where appropriate userns: Convert jfs to use kuid/kgid where appropriate userns: Convert jffs2 to use kuid and kgid where appropriate userns: Convert hpfs to use kuid and kgid where appropriate userns: Convert btrfs to use kuid/kgid where appropriate userns: Convert bfs to use kuid/kgid where appropriate userns: Convert affs to use kuid/kgid wherwe appropriate userns: On alpha modify linux_to_osf_stat to use convert from kuids and kgids userns: On ia64 deal with current_uid and current_gid being kuid and kgid userns: On ppc convert current_uid from a kuid before printing. userns: Convert s390 getting uid and gid system calls to use kuid and kgid userns: Convert s390 hypfs to use kuid and kgid where appropriate userns: Convert binder ipc to use kuids userns: Teach security_path_chown to take kuids and kgids userns: Add user namespace support to IMA userns: Convert EVM to deal with kuids and kgids in it's hmac computation ...
2012-09-18userns: Convert quotaEric W. Biederman
Now that the type changes are done, here is the final set of changes to make the quota code work when user namespaces are enabled. Small cleanups and fixes to make the code build when user namespaces are enabled. Cc: Jan Kara <jack@suse.cz> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
2012-09-18userns: Convert struct dquot_warnEric W. Biederman
Convert w_dq_id to be a struct kquid and remove the now unncessary w_dq_type. This is a simple conversion and enough other places have already been converted that this actually reduces the code complexity by a little bit, when removing now unnecessary type conversions. Cc: Jan Kara <jack@suse.cz> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
2012-09-18userns: Convert struct dquot dq_id to be a struct kqidEric W. Biederman
Change struct dquot dq_id to a struct kqid and remove the now unecessary dq_type. Make minimal changes to dquot, quota_tree, quota_v1, quota_v2, ext3, ext4, and ocfs2 to deal with the change in quota structures and signatures. The ocfs2 changes are larger than most because of the extensive tracing throughout the ocfs2 quota code that prints out dq_id. quota_tree.c:get_index is modified to take a struct kqid instead of a qid_t because all of it's callers pass in dquot->dq_id and it allows me to introduce only a single conversion. The rest of the changes are either just replacing dq_type with dq_id.type, adding conversions to deal with the change in type and occassionally adding qid_eq to allow quota id comparisons in a user namespace safe way. Cc: Mark Fasheh <mfasheh@suse.com> Cc: Joel Becker <jlbec@evilplan.org> Cc: Jan Kara <jack@suse.cz> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Andreas Dilger <adilger.kernel@dilger.ca> Cc: Theodore Tso <tytso@mit.edu> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
2012-09-18userns: Modify dqget to take struct kqidEric W. Biederman
Modify dqget to take struct kqid instead of a type and an identifier pair. Modify the callers of dqget in ocfs2 and dquot to take generate a struct kqid so they can continue to call dqget. The conversion to create struct kqid should all be the final conversions that are needed in those code paths. Cc: Jan Kara <jack@suse.cz> Cc: Mark Fasheh <mfasheh@suse.com> Cc: Joel Becker <jlbec@evilplan.org> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
2012-09-18userns: Convert quota netlink aka quota_send_warningEric W. Biederman
Modify quota_send_warning to take struct kqid instead a type and identifier pair. When sending netlink broadcasts always convert uids and quota identifiers into the intial user namespace. There is as yet no way to send a netlink broadcast message with different contents to receivers in different namespaces, so for the time being just map all of the identifiers into the initial user namespace which preserves the current behavior. Change the callers of quota_send_warning in gfs2, xfs and dquot to generate a struct kqid to pass to quota send warning. When all of the user namespaces convesions are complete a struct kqid values will be availbe without need for conversion, but a conversion is needed now to avoid needing to convert everything at once. Cc: Ben Myers <bpm@sgi.com> Cc: Alex Elder <elder@kernel.org> Cc: Dave Chinner <david@fromorbit.com> Cc: Jan Kara <jack@suse.cz> Cc: Steven Whitehouse <swhiteho@redhat.com> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
2012-09-18userns: Convert qutoactlEric W. Biederman
Update the quotactl user space interface to successfull compile with user namespaces support enabled and to hand off quota identifiers to lower layers of the kernel in struct kqid instead of type and qid pairs. The quota on function is not converted because while it takes a quota type and an id. The id is the on disk quota format to use, which is something completely different. The signature of two struct quotactl_ops methods were changed to take struct kqid argumetns get_dqblk and set_dqblk. The dquot, xfs, and ocfs2 implementations of get_dqblk and set_dqblk are minimally changed so that the code continues to work with the change in parameter type. This is the first in a series of changes to always store quota identifiers in the kernel in struct kqid and only use raw type and qid values when interacting with on disk structures or userspace. Always using struct kqid internally makes it hard to miss places that need conversion to or from the kernel internal values. Cc: Jan Kara <jack@suse.cz> Cc: Dave Chinner <david@fromorbit.com> Cc: Mark Fasheh <mfasheh@suse.com> Cc: Joel Becker <jlbec@evilplan.org> Cc: Ben Myers <bpm@sgi.com> Cc: Alex Elder <elder@kernel.org> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
2012-08-15quota: Move down dqptr_sem read after initializing default warn[] type at ↵Jeff Liu
__dquot_alloc_space(). sb->s_dqopt->dqptr_sem is used to serialize ops using pointers from inode to dquots. But for __dquot_alloc_space(), it could be safely moved down after the default warn[] array got initialized. Signed-off-by: Jie Liu <jeff.liu@oracle.com> Signed-off-by: Jan Kara <jack@suse.cz>
2012-07-24Merge branch 'for_linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs Pull misc udf, ext2, ext3, and isofs fixes from Jan Kara: "Assorted, mostly trivial, fixes for udf, ext2, ext3, and isofs. I'm on vacation and scarcely checking email since we are expecting baby any day now but these fixes should be safe to go in and I don't want to delay them unnecessarily." * 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs: udf: avoid info leak on export isofs: avoid info leak on export udf: Improve table length check to avoid possible overflow ext3: Check return value of blkdev_issue_flush() jbd: Check return value of blkdev_issue_flush() udf: Do not decrement i_blocks when freeing indirect extent block udf: Fix memory leak when mounting ext2: cleanup the confused goto label UDF: Remove unnecessary variable "offset" from udf_fill_inode udf: stop using s_dirt ext3: force ro mount if ext3_setup_super() fails quota: fix checkpatch.pl warning by replacing <asm/uaccess.h> with <linux/uaccess.h>
2012-07-22quota: Split dquot_quota_sync() to writeback and cache flushing partJan Kara
Split off part of dquot_quota_sync() which writes dquots into a quota file to a separate function. In the next patch we will use the function from filesystems and we do not want to abuse ->quota_sync quotactl callback more than necessary. Acked-by: Steven Whitehouse <swhiteho@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-07-09quota: fix checkpatch.pl warning by replacing <asm/uaccess.h> with ↵Jeff Liu
<linux/uaccess.h> checkpatch.pl warns: "WARNING: Use #include <linux/uaccess.h> instead of <asm/uaccess.h>" Below patch fixes it. Signed-off-by: Jie Liu <jeff.liu@oracle.com> Signed-off-by: Jan Kara <jack@suse.cz>
2012-05-15quota: Get rid of nested I_MUTEX_QUOTA locking subclassJan Kara
So far i_mutex was ranking above dqonoff_mutex and i_mutex on quota files was special and ranking below dqonoff_mutex (and several other locks). However there's no real need for i_mutex on quota files to be special. IO on quota files is serialized by dqio_mutex anyway so we don't need to take i_mutex when writing to quota files. Other places where we take i_mutex on quota file can accomodate standard i_mutex lock ranking, we only need to change the lock ranking to be dqonoff_mutex > i_mutex which is a matter of changing documentation because there's no place which would enforce ordering in the other direction. Signed-off-by: Jan Kara <jack@suse.cz>
2012-05-15quota: Use precomputed value of sb_dqopt in dquot_quota_syncJan Kara
Signed-off-by: Jan Kara <jack@suse.cz>
2012-05-15quota: Fix double lock in add_dquot_ref() with CONFIG_QUOTA_DEBUGJan Kara
When CONFIG_QUOTA_DEBUG is enabled we call inode_get_rsv_space() from add_dquot_ref() while holding i_lock. But inode_get_rsv_space() is trying to get i_lock as well resulting in double lock. Fix the problem by moving inode_get_rsv_space() call out of i_lock. Reported-and-analyzed-by: Jie Liu <jeff.liu@oracle.com> Signed-off-by: Jan Kara <jack@suse.cz>
2012-03-28Merge branch 'for_linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs Pull ext3, UDF, and quota fixes from Jan Kara: "A couple of ext3 & UDF fixes and also one improvement in quota locking." * 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs: ext3: fix start and len arguments handling in ext3_trim_fs() udf: Fix deadlock in udf_release_file() udf: Fix file entry logicalBlocksRecorded udf: Fix handling of i_blocks quota: Make quota code not call tty layer with dqptr_sem held udf: Init/maintain file entry checkpoint field ext3: Update ctime in ext3_splice_branch() only when needed ext3: Don't call dquot_free_block() if we don't update anything udf: Remove unnecessary OOM messages
2012-02-29quota: Make quota code not call tty layer with dqptr_sem heldJan Kara
dqptr_sem can be called from slab reclaim. tty layer uses GFP_KERNEL mask for allocation so it can end up calling slab reclaim. Given quota code can call into tty layer to print warning this creates possibility for lock inversion between tty->atomic_write_lock and dqptr_sem. Using direct printing of warnings from quota layer is obsolete but since it's easy enough to change quota code to not hold any locks when printing warnings, let's just do it. It seems like a good thing to do even when we use netlink layer to transmit warnings to userspace. Reported-by: Markus <M4rkusXXL@web.de> Signed-off-by: Jan Kara <jack@suse.cz>
2012-02-14security: trim security.hAl Viro
Trim security.h Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: James Morris <jmorris@namei.org>
2012-01-12quota: Pass information that quota is stored in system file to userspaceJan Kara
Quota tools need to know whether quota is stored in a system file or in classical aquota.{user|group} files. So pass this information as a flag in GETINFO quotactl. Signed-off-by: Jan Kara <jack@suse.cz>
2012-01-06vfs: prefer ->dentry->d_sb to ->mnt->mnt_sbAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>