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* quota: info leak in quota_getquota()Dan Carpenter2013-11-041-0/+1
| | | | | | | | The if_dqblk struct has a 4 byte hole at the end of the struct so uninitialized stack information is leaked to user space. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Jan Kara <jack@suse.cz>
* quota: Add a new quotactl command Q_XGETQSTATVChandra Seetharaman2013-08-201-0/+29
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | XFS now supports three types of quotas (user, group and project). Current version of Q_XGETSTAT has support for only two types of quotas. In order to support three types of quotas, the interface, specifically struct fs_quota_stat, need to be expanded. Current version of fs_quota_stat does not allow expansion without breaking backward compatibility. So, a quotactl command and new fs_quota_stat structure need to be added. This patch adds a new command Q_XGETQSTATV to quotactl() which takes a new data structure fs_quota_statv. This new data structure provides support for future expansion and backward compatibility. Callers of the new quotactl command have to set the version of the data structure being passed, and kernel will fill as much data as requested. If the kernel does not support the user-space provided version, EINVAL will be returned. User-space can reduce the version number and call the same quotactl again. Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com> Reviewed-by: Jan Kara <jack@suse.cz> Reviewed-by: Rich Johnston <rjohnston@sgi.com> Signed-off-by: Ben Myers <bpm@sgi.com> [v2: Applied rjohnston's suggestions as per Chandra's request. -bpm]
* quota: Use the pre-processor to compile out quotactl_cmd_write when ↵Lee Jones2012-12-131-0/+4
| | | | | | | | | | | | | !CONFIG_BLOCK quotactl_cmd_write() is only ever invoked when BLOCK is configured. When !CONFIG_BLOCK, the build warning below is displayed. Let's fix that. fs/quota/quota.c:311:12: warning: ‘quotactl_cmd_write’ defined but not used [-Wunused-function] Cc: Jan Kara <jack@suse.cz> Signed-off-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Jan Kara <jack@suse.cz>
* vfs: define struct filename and have getname() return itJeff Layton2012-10-131-2/+2
| | | | | | | | | | | | | | | | | | | | | | getname() is intended to copy pathname strings from userspace into a kernel buffer. The result is just a string in kernel space. It would however be quite helpful to be able to attach some ancillary info to the string. For instance, we could attach some audit-related info to reduce the amount of audit-related processing needed. When auditing is enabled, we could also call getname() on the string more than once and not need to recopy it from userspace. This patchset converts the getname()/putname() interfaces to return a struct instead of a string. For now, the struct just tracks the string in kernel space and the original userland pointer for it. Later, we'll add other information to the struct as it becomes convenient. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* userns: Convert qutoactlEric W. Biederman2012-09-181-6/+22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
* Merge branch 'for_linus' of ↵Linus Torvalds2012-07-251-1/+1
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * quota: fix checkpatch.pl warning by replacing <asm/uaccess.h> with ↵Jeff Liu2012-07-091-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | <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>
* | quota: Split dquot_quota_sync() to writeback and cache flushing partJan Kara2012-07-221-2/+2
|/ | | | | | | | | | | | 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>
* Merge branch 'for-linus' of git://oss.sgi.com/xfs/xfsLinus Torvalds2012-03-231-2/+1
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pull XFS updates from Ben Myers: "Scalability improvements for dquots, log grant code cleanups, plus bugfixes and cleanups large and small" Fix up various trivial conflicts that were due to some of the earlier patches already having been integrated into v3.3 as bugfixes, and then there were development patches on top of those. Easily merged by just taking the newer version from the pulled branch. * 'for-linus' of git://oss.sgi.com/xfs/xfs: (45 commits) xfs: fallback to vmalloc for large buffers in xfs_getbmap xfs: fallback to vmalloc for large buffers in xfs_attrmulti_attr_get xfs: remove remaining scraps of struct xfs_iomap xfs: fix inode lookup race xfs: clean up minor sparse warnings xfs: remove the global xfs_Gqm structure xfs: remove the per-filesystem list of dquots xfs: use per-filesystem radix trees for dquot lookup xfs: per-filesystem dquot LRU lists xfs: use common code for quota statistics xfs: reimplement fdatasync support xfs: split in-core and on-disk inode log item fields xfs: make xfs_inode_item_size idempotent xfs: log timestamp updates xfs: log file size updates at I/O completion time xfs: log file size updates as part of unwritten extent conversion xfs: do not require an ioend for new EOF calculation xfs: use per-filesystem I/O completion workqueues quota: make Q_XQUOTASYNC a noop xfs: include reservations in quota reporting ...
| * quota: make Q_XQUOTASYNC a noopChristoph Hellwig2012-02-291-2/+1
| | | | | | | | | | | | | | | | | | | | | | | | Now that XFS takes quota reservations into account there is no need to flush anything before reporting quotas - in addition to beeing fully transactional all quota information is also 100% coherent with the rest of the filesystem now. Reviewed-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Ben Myers <bpm@sgi.com>
* | quota: Fix deadlock with suspend and quotasJan Kara2012-02-141-3/+21
|/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | This script causes a kernel deadlock: set -e DEVICE=/dev/vg1/linear lvchange -ay $DEVICE mkfs.ext3 $DEVICE mount -t ext3 -o usrquota,grpquota $DEVICE /mnt/test quotacheck -gu /mnt/test umount /mnt/test mount -t ext3 -o usrquota,grpquota $DEVICE /mnt/test quotaon /mnt/test dmsetup suspend $DEVICE setquota -u root 1 2 3 4 /mnt/test & sleep 1 dmsetup resume $DEVICE setquota acquired semaphore s_umount for read and then tried to perform a transaction (and waits because the device is suspended). dmsetup resume tries to acquire s_umount for write before resuming the device (and waits for setquota). Fix the deadlock by grabbing a thawed superblock for quota commands which need it. Reported-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* fs: move code out of buffer.cAl Viro2012-01-041-1/+0
| | | | | | | | | | | | | | | Move invalidate_bdev, block_sync_page into fs/block_dev.c. Export kill_bdev as well, so brd doesn't have to open code it. Reduce buffer_head.h requirement accordingly. Removed a rather large comment from invalidate_bdev, as it looked a bit obsolete to bother moving. The small comment replacing it says enough. Signed-off-by: Nick Piggin <npiggin@suse.de> Cc: Al Viro <viro@ZenIV.linux.org.uk> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* Merge branch 'writeback-for-linus' of ↵Linus Torvalds2011-11-071-1/+1
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux * 'writeback-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux: writeback: Add a 'reason' to wb_writeback_work writeback: send work item to queue_io, move_expired_inodes writeback: trace event balance_dirty_pages writeback: trace event bdi_dirty_ratelimit writeback: fix ppc compile warnings on do_div(long long, unsigned long) writeback: per-bdi background threshold writeback: dirty position control - bdi reserve area writeback: control dirty pause time writeback: limit max dirty pause time writeback: IO-less balance_dirty_pages() writeback: per task dirty rate limit writeback: stabilize bdi->dirty_ratelimit writeback: dirty rate control writeback: add bg_threshold parameter to __bdi_update_bandwidth() writeback: dirty position control writeback: account per-bdi accumulated dirtied pages
| * writeback: Add a 'reason' to wb_writeback_workCurt Wohlgemuth2011-10-301-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This creates a new 'reason' field in a wb_writeback_work structure, which unambiguously identifies who initiates writeback activity. A 'wb_reason' enumeration has been added to writeback.h, to enumerate the possible reasons. The 'writeback_work_class' and tracepoint event class and 'writeback_queue_io' tracepoints are updated to include the symbolic 'reason' in all trace events. And the 'writeback_inodes_sbXXX' family of routines has had a wb_stats parameter added to them, so callers can specify why writeback is being started. Acked-by: Jan Kara <jack@suse.cz> Signed-off-by: Curt Wohlgemuth <curtw@google.com> Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
* | Merge branch 'for_linus' of ↵Linus Torvalds2011-11-021-2/+5
|\ \ | |/ |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs * 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs: udf: Cleanup metadata flags handling udf: Skip mirror metadata FE loading when metadata FE is ok ext3: Allow quota file use root reservation udf: Remove web reference from UDF MAINTAINERS entry quota: Drop path reference on error exit from quotactl udf: Neaten udf_debug uses udf: Neaten logging output, use vsprintf extension %pV udf: Convert printks to pr_<level> udf: Rename udf_warning to udf_warn udf: Rename udf_error to udf_err udf: Promote some debugging messages to udf_error ext3: Remove the obsolete broken EXT3_IOC32_WAIT_FOR_READONLY. udf: Add readpages support for udf. ext3/balloc.c: local functions should be static ext2: fix the outdated comment in ext2_nfs_get_inode() ext3: remove deprecated oldalloc fs/ext3/balloc.c: delete useless initialization fs/ext2/balloc.c: delete useless initialization ext3: fix message in ext3_remount for rw-remount case ext3: Remove i_mutex from ext3_sync_file() Fix up trivial (printf format cleanup) conflicts in fs/udf/udfdecl.h
| * quota: Drop path reference on error exit from quotactlJan Kara2011-10-311-2/+5
| | | | | | | | | | | | | | One error exit from quotactl forgot to do path_put(). Fix that. Reported-by: Valerie Aurora <val@vaaconsulting.com> Signed-off-by: Jan Kara <jack@suse.cz>
* | VFS: Fix the remaining automounter semantics regressionsTrond Myklebust2011-09-271-1/+1
|/ | | | | | | | | | | | | | The concensus seems to be that system calls such as stat() etc should not trigger an automount. Neither should the l* versions. This patch therefore adds a LOOKUP_AUTOMOUNT flag to tag those lookups that _should_ trigger an automount on the last path element. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> [ Edited to leave out the cases that are already covered by LOOKUP_OPEN, LOOKUP_DIRECTORY and LOOKUP_CREATE - all of which also fundamentally force automounting for their own reasons - Linus ] Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* quota: Fix deadlock during path resolutionJan Kara2011-01-121-14/+27
| | | | | | | | | | | | | | | | | | | | As Al Viro pointed out path resolution during Q_QUOTAON calls to quotactl is prone to deadlocks. We hold s_umount semaphore for reading during the path resolution and resolution itself may need to acquire the semaphore for writing when e. g. autofs mountpoint is passed. Solve the problem by performing the resolution before we get hold of the superblock (and thus s_umount semaphore). The whole thing is complicated by the fact that some filesystems (OCFS2) ignore the path argument. So to distinguish between filesystem which want the path and which do not we introduce new .quota_on_meta callback which does not get the path. OCFS2 then uses this callback instead of old .quota_on. CC: Al Viro <viro@ZenIV.linux.org.uk> CC: Christoph Hellwig <hch@lst.de> CC: Ted Ts'o <tytso@mit.edu> CC: Joel Becker <joel.becker@oracle.com> Signed-off-by: Jan Kara <jack@suse.cz>
* quota: drop remount argument to ->quota_on and ->quota_offChristoph Hellwig2010-05-241-2/+2
| | | | | | | | Remount handling has fully moved into the filesystem, so all this is superflous now. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jan Kara <jack@suse.cz>
* new helper: iterate_supers()Al Viro2010-05-221-24/+9
| | | | | | | ... and switch the simple "loop over superblocks and do something" loops to it. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* Bury __put_super_and_need_restart()Al Viro2010-05-221-0/+1
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* Convert simple loops over superblocks to list_for_each_entry_safeAl Viro2010-05-221-5/+3
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* Leave superblocks on s_list until the endAl Viro2010-05-221-0/+2
| | | | | | | | | | | We used to remove from s_list and s_instances at the same time. So let's *not* do the former and skip superblocks that have empty s_instances in the loops over s_list. The next step, of course, will be to get rid of rescan logics in those loops. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* quota: remove sb_has_quota_active in get/set_infoChristoph Hellwig2010-05-211-4/+0
| | | | | | | | | The methods already do these checks, so remove them in the quotactl implementation to allow non-VFS quota implementations to also support these calls. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jan Kara <jack@suse.cz>
* quota: unify ->set_dqblkChristoph Hellwig2010-05-211-5/+31
| | | | | | | | | | | | | | Pass the larger struct fs_disk_quota to the ->set_dqblk operation so that the Q_SETQUOTA and Q_XSETQUOTA operations can be implemented with a single filesystem operation and we can retire the ->set_xquota operation. The additional information (RT-subvolume accounting and warn counts) are left zero for the VFS quota implementation. Add new fieldmask values for setting the numer of blocks and inodes values which is required for the VFS quota, but wasn't for XFS. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jan Kara <jack@suse.cz>
* quota: unify ->get_dqblkChristoph Hellwig2010-05-211-5/+18
| | | | | | | | | | | Pass the larger struct fs_disk_quota to the ->get_dqblk operation so that the Q_GETQUOTA and Q_XGETQUOTA operations can be implemented with a single filesystem operation and we can retire the ->get_xquota operation. The additional information (RT-subvolume accounting and warn counts) are left zero for the VFS quota implementation. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jan Kara <jack@suse.cz>
* quota: split out compat_sys_quotactl support from quota.cChristoph Hellwig2010-03-051-117/+0
| | | | | | | Instead of adding ifdefs just split it into a new file. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jan Kara <jack@suse.cz>
* quota: split out netlink notification support from quota.cChristoph Hellwig2010-03-051-93/+0
| | | | | | | Instead of adding ifdefs just split it into a new file. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jan Kara <jack@suse.cz>
* quota: remove invalid optimization from quota_sync_allChristoph Hellwig2010-03-051-15/+0
| | | | | | | | | | Checking the "VFS" quota enabled and dirty bits from generic code means this code will never get called for other implementations, e.g. XFS and GFS2. Grabbing the reference on the superblock really isn't much overhead for a global Q_SYNC call, so just drop this optimization. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jan Kara <jack@suse.cz>
* quota: move code from sync_quota_sb into vfs_quota_syncChristoph Hellwig2010-03-051-41/+5
| | | | | | | | | | | | | Currenly sync_quota_sb does a lot of sync and truncate action that only applies to "VFS" style quotas and is actively harmful for the sync performance in XFS. Move it into vfs_quota_sync and add a wait parameter to ->quota_sync to tell if we need it or not. My audit of the GFS2 code says it's also not needed given the way GFS2 implements quotas, but I'd be happy if this can get a detailed review. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jan Kara <jack@suse.cz>
* quota: clean up Q_XQUOTASYNCChristoph Hellwig2010-03-051-4/+7
| | | | | | | | | | | | | | | | | | | | Currently Q_XQUOTASYNC calls into the quota_sync method, but XFS does something entirely different in it than the rest of the filesystems. xfs_quota which calls Q_XQUOTASYNC expects an asynchronous data writeout to flush delayed allocations, while the "VFS" quota support wants to flush changes to the quota file. So make Q_XQUOTASYNC call into the writeback code directly and make the quota_sync method optional as XFS doesn't need in the sense expected by the rest of the quota code. GFS2 was using limited XFS-style quota and has a quota_sync method fitting neither the style used by vfs_quota_sync nor xfs_fs_quota_sync. I left it in for now as per discussion with Steve it expects to be called from the sync path this way. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jan Kara <jack@suse.cz>
* quota: simplify permission checkingChristoph Hellwig2010-03-051-61/+31
| | | | | | | | | | Stop having complicated different routines for checking permissions for XQM vs "VFS" quotas. Instead do the checks for having sb->s_qcop and a valid type directly in do_quotactl, and munge the *quotactl_valid functions into a check_quotactl_permission helper that only checks for permissions. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jan Kara <jack@suse.cz>
* quota: special case Q_SYNC without device nameChristoph Hellwig2010-03-051-13/+27
| | | | | | | | | | The Q_SYNC command can be called without the path to a device, in which case it iterates over all superblocks. Special case this variant directly in sys_quotactl so that the other code always gets a superblock and doesn't need to deal with this case. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jan Kara <jack@suse.cz>
* quota: clean up checks for supported quota methodsChristoph Hellwig2010-03-051-84/+37
| | | | | | | | Move the checks for sb->s_qcop->foo next to the actual calls for them, same for sb_has_quota_active checks where applicable. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jan Kara <jack@suse.cz>
* quota: split do_quotactlChristoph Hellwig2010-03-051-104/+146
| | | | | | | Split out a helper for each non-trivial command from do_quotactl. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jan Kara <jack@suse.cz>
* VFS: Export dquot_send_warningSteven Whitehouse2009-12-031-0/+93
| | | | | | | | | | | Sending a message to userspace in a generic format to warn of events (e.g. quota exceeded) in the quota subsystem is a generically useful feature. This patch makes some minor changes to the send_message function from dquot.c renaming it quota_send_message, moving it to quota.c and exporting it for use by filesystems which do not use the dquot code. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* quota: cleanup dquota sync functions (version 4)Christoph Hellwig2009-06-121-11/+14
| | | | | | | | | | | | | | | | | | | | Currently the VFS calls vfs_dq_sync to sync out disk quotas for a given superblock. This is a small wrapper around sync_dquots which for the case of a non-NULL superblock is a small wrapper around quota_sync_sb. Just make quota_sync_sb global (rename it to sync_quota_sb) and call it directly. Also call it directly for those cases in quota.c that have a superblock and leave sync_dquots purely an iterator over sync_quota_sb and remove it's superblock argument. To make this nicer move the check for the lack of a quota_sync method from the callers into sync_quota_sb. [folded build fix from Alexander Beregalov <a.beregalov@gmail.com>] Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* quota: Coding style fixesJan Kara2009-03-261-12/+23
| | | | | | | Wrap long lines, remove assignments from conditions, rewrite two overcomplicated for loops. Signed-off-by: Jan Kara <jack@suse.cz>
* quota: Remove superfluous inlinesJan Kara2009-03-261-1/+1
| | | | | | | Remove inlines of large functions to decrease code size (saved 1543 bytes). Signed-off-by: Jan Kara <jack@suse.cz>
* quota: Move quota files into separate directoryJan Kara2009-03-261-0/+513
Quota subsystem has more and more files. It's time to create a dir for it. Signed-off-by: Jan Kara <jack@suse.cz>