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path: root/fs/notify/inotify/inotify_fsnotify.c
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2012-12-11fsnotify: pass group to fsnotify_destroy_mark()Lino Sanfilippo1-1/+1
In fsnotify_destroy_mark() dont get the group from the passed mark anymore, but pass the group itself as an additional parameter to the function. Signed-off-by: Lino Sanfilippo <LinoSanfilippo@gmx.de> Signed-off-by: Eric Paris <eparis@redhat.com>
2012-12-11fsnotify: use reference counting for groupsLino Sanfilippo1-0/+2
Get a group ref for each mark that is added to the groups list and release that ref when the mark is freed in fsnotify_put_mark(). We also use get a group reference for duplicated marks and for private event data. Now we dont free a group any more when the number of marks becomes 0 but when the groups ref count does. Since this will only happen when all marks are removed from a groups mark list, we dont have to set the groups number of marks to 1 at group creation. Beside clearing all marks in fsnotify_destroy_group() we do also flush the groups event queue. This is since events may hold references to groups (due to private event data) and we have to put those references first before we get a chance to put the final ref, which will result in a call to fsnotify_final_destroy_group(). Signed-off-by: Lino Sanfilippo <LinoSanfilippo@gmx.de> Signed-off-by: Eric Paris <eparis@redhat.com>
2011-04-07Merge branch 'for-linus2' of git://git.profusion.mobi/users/lucas/linux-2.6Linus Torvalds1-1/+1
* 'for-linus2' of git://git.profusion.mobi/users/lucas/linux-2.6: Fix common misspellings
2011-04-05inotify: fix double free/corruption of stuct userEric Paris1-0/+1
On an error path in inotify_init1 a normal user can trigger a double free of struct user. This is a regression introduced by a2ae4cc9a16e ("inotify: stop kernel memory leak on file creation failure"). We fix this by making sure that if a group exists the user reference is dropped when the group is cleaned up. We should not explictly drop the reference on error and also drop the reference when the group is cleaned up. The new lifetime rules are that an inotify group lives from inotify_new_group to the last fsnotify_put_group. Since the struct user and inotify_devs are directly tied to this lifetime they are only changed/updated in those two locations. We get rid of all special casing of struct user or user->inotify_devs. Signed-off-by: Eric Paris <eparis@redhat.com> Cc: stable@kernel.org (2.6.37 and up) Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-03-31Fix common misspellingsLucas De Marchi1-1/+1
Fixes generated by 'codespell' and manually reviewed. Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
2010-08-12Revert "fsnotify: store struct file not struct path"Linus Torvalds1-6/+6
This reverts commit 3bcf3860a4ff9bbc522820b4b765e65e4deceb3e (and the accompanying commit c1e5c954020e "vfs/fsnotify: fsnotify_close can delay the final work in fput" that was a horribly ugly hack to make it work at all). The 'struct file' approach not only causes that disgusting hack, it somehow breaks pulseaudio, probably due to some other subtlety with f_count handling. Fix up various conflicts due to later fsnotify work. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-07-28fanotify: use both marks when possibleEric Paris1-2/+2
fanotify currently, when given a vfsmount_mark will look up (if it exists) the corresponding inode mark. This patch drops that lookup and uses the mark provided. Signed-off-by: Eric Paris <eparis@redhat.com>
2010-07-28fsnotify: pass both the vfsmount mark and inode markEric Paris1-4/+8
should_send_event() and handle_event() will both need to look up the inode event if they get a vfsmount event. Lets just pass both at the same time since we have them both after walking the lists in lockstep. Signed-off-by: Eric Paris <eparis@redhat.com>
2010-07-28fsnotify: cleanup should_send_eventEric Paris1-11/+3
The change to use srcu and walk the object list rather than the global fsnotify_group list means that should_send_event is no longer needed for a number of groups and can be simplified for others. Do that. Signed-off-by: Eric Paris <eparis@redhat.com>
2010-07-28inotify: use the mark in handler functionsEric Paris1-24/+5
inotify now gets a mark in the should_send_event and handle_event functions. Rather than look up the mark themselves inotify should just use the mark it was handed. Signed-off-by: Eric Paris <eparis@redhat.com>
2010-07-28fsnotify: send fsnotify_mark to groups in event handling functionsEric Paris1-3/+5
With the change of fsnotify to use srcu walking the marks list instead of walking the global groups list we now know the mark in question. The code can send the mark to the group's handling functions and the groups won't have to find those marks themselves. Signed-off-by: Eric Paris <eparis@redhat.com>
2010-07-28fsnotify: store struct file not struct pathEric Paris1-6/+6
Al explains that calling dentry_open() with a mnt/dentry pair is only garunteed to be safe if they are already used in an open struct file. To make sure this is the case don't store and use a struct path in fsnotify, always use a struct file. Signed-off-by: Eric Paris <eparis@redhat.com>
2010-07-28fsnotify: fsnotify_add_notify_event should return an eventEric Paris1-14/+14
Rather than the horrific void ** argument and such just to pass the fanotify_merge event back to the caller of fsnotify_add_notify_event() have those things return an event if it was different than the event suggusted to be added. Signed-off-by: Eric Paris <eparis@redhat.com>
2010-07-28fsnotify: add pr_debug throughoutEric Paris1-0/+6
It can be hard to debug fsnotify since there are so few printks. Use pr_debug to allow for dynamic debugging. Signed-off-by: Eric Paris <eparis@redhat.com>
2010-07-28inotify: allow users to request not to recieve events on unlinked childrenEric Paris1-0/+9
An inotify watch on a directory will send events for children even if those children have been unlinked. This patch add a new inotify flag IN_EXCL_UNLINK which allows a watch to specificy they don't care about unlinked children. This should fix performance problems seen by tasks which add a watch to /tmp and then are overrun with events when other processes are reading and writing to unlinked files they created in /tmp. https://bugzilla.kernel.org/show_bug.cgi?id=16296 Requested-by: Matthias Clasen <mclasen@redhat.com> Signed-off-by: Eric Paris <eparis@redhat.com>
2010-07-28inotify: fix inotify oneshot supportEric Paris1-0/+3
During the large inotify rewrite to fsnotify I completely dropped support for IN_ONESHOT. Reimplement that support. Signed-off-by: Eric Paris <eparis@redhat.com>
2010-07-28fsnotify: intoduce a notification merge argumentEric Paris1-2/+4
Each group can define their own notification (and secondary_q) merge function. Inotify does tail drop, fanotify does matching and drop which can actually allocate a completely new event. But for fanotify to properly deal with permissions events it needs to know the new event which was ultimately added to the notification queue. This patch just implements a void ** argument which is passed to the merge function. fanotify can use this field to pass the new event back to higher layers. Signed-off-by: Eric Paris <eparis@redhat.com> for fanotify to properly deal with permissions events
2010-07-28fsnotify: split generic and inode specific mark codeEric Paris1-2/+2
currently all marking is done by functions in inode-mark.c. Some of this is pretty generic and should be instead done in a generic function and we should only put the inode specific code in inode-mark.c Signed-off-by: Eric Paris <eparis@redhat.com>
2010-07-28fsnotify: take inode->i_lock inside fsnotify_find_mark_entry()Andreas Gruenbacher1-4/+0
All callers to fsnotify_find_mark_entry() except one take and release inode->i_lock around the call. Take the lock inside fsnotify_find_mark_entry() instead. Signed-off-by: Andreas Gruenbacher <agruen@suse.de> Signed-off-by: Eric Paris <eparis@redhat.com>
2010-07-28inotify: rename mark_entry to just markEric Paris1-24/+24
rename anything in inotify that deals with mark_entry to just be mark. It makes a lot more sense. Signed-off-by: Eric Paris <eparis@redhat.com>
2010-07-28fsnotify: rename fsnotify_find_mark_entry to fsnotify_find_markEric Paris1-2/+2
the _entry portion of fsnotify functions is useless. Drop it. Signed-off-by: Eric Paris <eparis@redhat.com>
2010-07-28fsnotify: rename fsnotify_mark_entry to just fsnotify_markEric Paris1-4/+4
The name is long and it serves no real purpose. So rename fsnotify_mark_entry to just fsnotify_mark. Signed-off-by: Eric Paris <eparis@redhat.com>
2010-07-28fsnotify: put inode specific fields in an fsnotify_mark in a unionEric Paris1-1/+1
The addition of marks on vfs mounts will be simplified if the inode specific parts of a mark and the vfsmnt specific parts of a mark are actually in a union so naming can be easy. This patch just implements the inode struct and the union. Signed-off-by: Eric Paris <eparis@redhat.com>
2010-07-28fsnotify: include vfsmount in should_send_event when appropriateEric Paris1-1/+2
To ensure that a group will not duplicate events when it receives it based on the vfsmount and the inode should_send_event test we should distinguish those two cases. We pass a vfsmount to this function so groups can make their own determinations. Signed-off-by: Eric Paris <eparis@redhat.com>
2010-07-28fsnotify: per group notification queue merge typesEric Paris1-1/+55
inotify only wishes to merge a new event with the last event on the notification fifo. fanotify is willing to merge any events including by means of bitwise OR masks of multiple events together. This patch moves the inotify event merging logic out of the generic fsnotify notification.c and into the inotify code. This allows each use of fsnotify to provide their own merge functionality. Signed-off-by: Eric Paris <eparis@redhat.com>
2010-07-28fsnotify: include data in should_send callsEric Paris1-1/+1
fanotify is going to need to look at file->private_data to know if an event should be sent or not. This passes the data (which might be a file, dentry, inode, or none) to the should_send function calls so fanotify can get that information when available Signed-off-by: Eric Paris <eparis@redhat.com>
2010-07-28fsnotify: provide the data type to should_send_eventEric Paris1-1/+2
fanotify is only interested in event types which contain enough information to open the original file in the context of the fanotify listener. Since fanotify may not want to send events if that data isn't present we pass the data type to the should_send_event function call so fanotify can express its lack of interest. Signed-off-by: Eric Paris <eparis@redhat.com>
2010-05-14inotify: don't leak user struct on inotify releasePavel Emelyanov1-0/+2
inotify_new_group() receives a get_uid-ed user_struct and saves the reference on group->inotify_data.user. The problem is that free_uid() is never called on it. Issue seem to be introduced by 63c882a0 (inotify: reimplement inotify using fsnotify) after 2.6.30. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Eric Paris <eparis@parisplace.org> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Eric Paris <eparis@redhat.com>
2010-01-15inotify: only warn once for inotify problemsEric Paris1-1/+1
inotify will WARN() if it finds that the idr and the fsnotify internals somehow got out of sync. It was only supposed to do this once but due to this stupid bug it would warn every single time a problem was detected. Signed-off-by: Eric Paris <eparis@redhat.com> Cc: stable@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-08-27inotify: do not BUG on idr entries at inotify destructionEric Paris1-2/+31
If an inotify watch is left in the idr when an fsnotify group is destroyed this will lead to a BUG. This is not a dangerous situation and really indicates a programming bug and leak of memory. This patch changes it to use a WARN and a printk rather than killing people's boxes. Signed-off-by: Eric Paris <eparis@redhat.com>
2009-08-17notify: unused event private raceEric Paris1-6/+7
inotify decides if private data it passed to get added to an event was used by checking list_empty(). But it's possible that the event may have been dequeued and the private event removed so it would look empty. The fix is to use the return code from fsnotify_add_notify_event rather than looking at the list. Signed-off-by: Eric Paris <eparis@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-06-19inotify: inotify_destroy_mark_entry could get called twiceEric Paris1-1/+1
inotify_destroy_mark_entry could get called twice for the same mark since it is called directly in inotify_rm_watch and when the mark is being destroyed for another reason. As an example assume that the file being watched was just deleted so inotify_destroy_mark_entry would get called from the path fsnotify_inoderemove() -> fsnotify_destroy_marks_by_inode() -> fsnotify_destroy_mark_entry() -> inotify_destroy_mark_entry(). If this happened at the same time as userspace tried to remove a watch via inotify_rm_watch we could attempt to remove the mark from the idr twice and could thus double dec the ref cnt and potentially could be in a use after free/double free situation. The fix is to have inotify_rm_watch use the generic recursive safe fsnotify_destroy_mark_by_entry() so we are sure the inotify_destroy_mark_entry() function can only be called one. This patch also renames the function to inotify_ingored_remove_idr() so it is clear what is actually going on in the function. Hopefully this fixes: [ 20.342058] idr_remove called for id=20 which is not allocated. [ 20.348000] Pid: 1860, comm: udevd Not tainted 2.6.30-tip #1077 [ 20.353933] Call Trace: [ 20.356410] [<ffffffff811a82b7>] idr_remove+0x115/0x18f [ 20.361737] [<ffffffff8134259d>] ? _spin_lock+0x6d/0x75 [ 20.367061] [<ffffffff8111640a>] ? inotify_destroy_mark_entry+0xa3/0xcf [ 20.373771] [<ffffffff8111641e>] inotify_destroy_mark_entry+0xb7/0xcf [ 20.380306] [<ffffffff81115913>] inotify_freeing_mark+0xe/0x10 [ 20.386238] [<ffffffff8111410d>] fsnotify_destroy_mark_by_entry+0x143/0x170 [ 20.393293] [<ffffffff811163a3>] inotify_destroy_mark_entry+0x3c/0xcf [ 20.399829] [<ffffffff811164d1>] sys_inotify_rm_watch+0x9b/0xc6 [ 20.405850] [<ffffffff8100bcdb>] system_call_fastpath+0x16/0x1b Reported-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Eric Paris <eparis@redhat.com> Tested-by: Peter Ziljlstra <peterz@infradead.org>
2009-06-11inotify/dnotify: should_send_event shouldn't match on FS_EVENT_ON_CHILDEric Paris1-0/+1
inotify and dnotify will both indicate that they want any event which came from a child inode. The fix is to mask off FS_EVENT_ON_CHILD when deciding if inotify or dnotify is interested in a given event. Signed-off-by: Eric Paris <eparis@redhat.com>
2009-06-11inotify: reimplement inotify using fsnotifyEric Paris1-0/+137
Reimplement inotify_user using fsnotify. This should be feature for feature exactly the same as the original inotify_user. This does not make any changes to the in kernel inotify feature used by audit. Those patches (and the eventual removal of in kernel inotify) will come after the new inotify_user proves to be working correctly. Signed-off-by: Eric Paris <eparis@redhat.com> Acked-by: Al Viro <viro@zeniv.linux.org.uk> Cc: Christoph Hellwig <hch@lst.de>