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* dnotify: Handle errors from fsnotify_add_mark_locked() in fcntl_dirnotify()Jan Kara2017-10-311-1/+6
| | | | | | | | | | | | | | fsnotify_add_mark_locked() can fail but we do not check its return value. This didn't matter before commit 9dd813c15b2c "fsnotify: Move mark list head from object into dedicated structure" as none of possible failures could happen for dnotify but after that commit -ENOMEM can be returned. Handle this error properly in fcntl_dirnotify() as otherwise we just hit BUG_ON(dn_mark->dn) in dnotify_free_mark(). Reviewed-by: Amir Goldstein <amir73il@gmail.com> Reported-by: syzkaller Fixes: 9dd813c15b2c101168808d4f5941a29985758973 Signed-off-by: Jan Kara <jack@suse.cz>
* fsnotify: make dnotify_fsnotify_ops constBhumika Goyal2017-08-301-1/+1
| | | | | | | Make this const as it is never modified. Signed-off-by: Bhumika Goyal <bhumirks@gmail.com> Signed-off-by: Jan Kara <jack@suse.cz>
* fsnotify: Move ->free_mark callback to fsnotify_opsJan Kara2017-04-101-1/+2
| | | | | | | | | | Pointer to ->free_mark callback unnecessarily occupies one long in each fsnotify_mark although they are the same for all marks from one notification group. Move the callback pointer to fsnotify_ops. Reviewed-by: Miklos Szeredi <mszeredi@redhat.com> Reviewed-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Jan Kara <jack@suse.cz>
* fsnotify: Add group pointer in fsnotify_init_mark()Jan Kara2017-04-101-3/+2
| | | | | | | | | | | | | Currently we initialize mark->group only in fsnotify_add_mark_lock(). However we will need to access fsnotify_ops of corresponding group from fsnotify_put_mark() so we need mark->group initialized earlier. Do that in fsnotify_init_mark() which has a consequence that once fsnotify_init_mark() is called on a mark, the mark has to be destroyed by fsnotify_put_mark(). Reviewed-by: Miklos Szeredi <mszeredi@redhat.com> Reviewed-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Jan Kara <jack@suse.cz>
* fsnotify: Remove fsnotify_find_{inode|vfsmount}_mark()Jan Kara2017-04-101-2/+2
| | | | | | | | | These are very thin wrappers, just remove them. Drop fs/notify/vfsmount_mark.c as it is empty now. Reviewed-by: Miklos Szeredi <mszeredi@redhat.com> Reviewed-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Jan Kara <jack@suse.cz>
* fsnotify: Remove fsnotify_set_mark_{,ignored_}mask_locked()Jan Kara2017-04-101-6/+3
| | | | | | | | | These helpers are now only a simple assignment and just obfuscate what is going on. Remove them. Reviewed-by: Miklos Szeredi <mszeredi@redhat.com> Reviewed-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Jan Kara <jack@suse.cz>
* fsnotify: Pass fsnotify_iter_info into handle_event handlerJan Kara2017-04-101-1/+2
| | | | | | | | | | | | Pass fsnotify_iter_info into ->handle_event() handler so that it can release and reacquire SRCU lock via fsnotify_prepare_user_wait() and fsnotify_finish_user_wait() functions. These functions also make sure current marks are appropriately pinned so that iteration protected by srcu in fsnotify() stays safe. Reviewed-by: Miklos Szeredi <mszeredi@redhat.com> Reviewed-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Jan Kara <jack@suse.cz>
* fsnotify: Move locking into fsnotify_recalc_mask()Jan Kara2017-04-101-2/+1
| | | | | | | | | | Move locking of locks protecting a list of marks into fsnotify_recalc_mask(). This reduces code churn in the following patch which changes the lock protecting the list of marks. Reviewed-by: Miklos Szeredi <mszeredi@redhat.com> Reviewed-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Jan Kara <jack@suse.cz>
* fsnotify: Move object pointer to fsnotify_mark_connectorJan Kara2017-04-101-2/+2
| | | | | | | | | | | Move pointer to inode / vfsmount from mark itself to the fsnotify_mark_connector structure. This is another step on the path towards decoupling inode / vfsmount lifetime from notification mark lifetime. Reviewed-by: Miklos Szeredi <mszeredi@redhat.com> Reviewed-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Jan Kara <jack@suse.cz>
* fsnotify: constify 'data' passed to ->handle_event()Al Viro2016-12-061-1/+1
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* fsnotify: get rid of fsnotify_destroy_mark_locked()Jan Kara2015-09-051-4/+10
| | | | | | | | | | | | | | | fsnotify_destroy_mark_locked() is subtle to use because it temporarily releases group->mark_mutex. To avoid future problems with this function, split it into two. fsnotify_detach_mark() is the part that needs group->mark_mutex and fsnotify_free_mark() is the part that must be called outside of group->mark_mutex. This way it's much clearer what's going on and we also avoid some pointless acquisitions of group->mark_mutex. Signed-off-by: Jan Kara <jack@suse.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* fsnotify: unify inode and mount marks handlingJan Kara2014-12-131-2/+2
| | | | | | | | | | | There's a lot of common code in inode and mount marks handling. Factor it out to a common helper function. Signed-off-by: Jan Kara <jack@suse.cz> Cc: Eric Paris <eparis@redhat.com> Cc: Heinrich Schuchardt <xypron.glpk@gmx.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* security: make security_file_set_fowner, f_setown and __f_setown void returnJeff Layton2014-09-091-7/+1
| | | | | | | | | | security_file_set_fowner always returns 0, so make it f_setown and __f_setown void return functions and fix up the error handling in the callers. Cc: linux-security-module@vger.kernel.org Signed-off-by: Jeff Layton <jlayton@primarydata.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
* inotify: Fix reporting of cookies for inotify eventsJan Kara2014-02-181-1/+1
| | | | | | | | | | | | | | | | My rework of handling of notification events (namely commit 7053aee26a35 "fsnotify: do not share events between notification groups") broke sending of cookies with inotify events. We didn't propagate the value passed to fsnotify() properly and passed 4 uninitialized bytes to userspace instead (so it is also an information leak). Sadly I didn't notice this during my testing because inotify cookies aren't used very much and LTP inotify tests ignore them. Fix the problem by passing the cookie value properly. Fixes: 7053aee26a3548ebaba046ae2e52396ccf56ac6c Reported-by: Vegard Nossum <vegard.nossum@oracle.com> Signed-off-by: Jan Kara <jack@suse.cz>
* fsnotify: remove pointless NULL initializersJan Kara2014-01-221-3/+0
| | | | | | | | | | | | | We usually rely on the fact that struct members not specified in the initializer are set to NULL. So do that with fsnotify function pointers as well. Signed-off-by: Jan Kara <jack@suse.cz> Reviewed-by: Christoph Hellwig <hch@lst.de> Cc: Eric Paris <eparis@parisplace.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* fsnotify: remove .should_send_event callbackJan Kara2014-01-221-18/+4
| | | | | | | | | | | | | After removing event structure creation from the generic layer there is no reason for separate .should_send_event and .handle_event callbacks. So just remove the first one. Signed-off-by: Jan Kara <jack@suse.cz> Reviewed-by: Christoph Hellwig <hch@lst.de> Cc: Eric Paris <eparis@parisplace.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* fsnotify: do not share events between notification groupsJan Kara2014-01-221-6/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently fsnotify framework creates one event structure for each notification event and links this event into all interested notification groups. This is done so that we save memory when several notification groups are interested in the event. However the need for event structure shared between inotify & fanotify bloats the event structure so the result is often higher memory consumption. Another problem is that fsnotify framework keeps path references with outstanding events so that fanotify can return open file descriptors with its events. This has the undesirable effect that filesystem cannot be unmounted while there are outstanding events - a regression for inotify compared to a situation before it was converted to fsnotify framework. For fanotify this problem is hard to avoid and users of fanotify should kind of expect this behavior when they ask for file descriptors from notified files. This patch changes fsnotify and its users to create separate event structure for each group. This allows for much simpler code (~400 lines removed by this patch) and also smaller event structures. For example on 64-bit system original struct fsnotify_event consumes 120 bytes, plus additional space for file name, additional 24 bytes for second and each subsequent group linking the event, and additional 32 bytes for each inotify group for private data. After the conversion inotify event consumes 48 bytes plus space for file name which is considerably less memory unless file names are long and there are several groups interested in the events (both of which are uncommon). Fanotify event fits in 56 bytes after the conversion (fanotify doesn't care about file names so its events don't have to have it allocated). A win unless there are four or more fanotify groups interested in the event. The conversion also solves the problem with unmount when only inotify is used as we don't have to grab path references for inotify events. [hughd@google.com: fanotify: fix corruption preventing startup] Signed-off-by: Jan Kara <jack@suse.cz> Reviewed-by: Christoph Hellwig <hch@lst.de> Cc: Eric Paris <eparis@parisplace.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Hugh Dickins <hughd@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* dnotify: replace dnotify_mark_mutex with mark mutex of dnotify_groupLino Sanfilippo2013-07-091-12/+13
| | | | | | | | | | | | There is no need to use a special mutex to protect against the fcntl/close race (see dnotify.c for a description of this race). Instead the dnotify_groups mark mutex can be used. Signed-off-by: Lino Sanfilippo <LinoSanfilippo@gmx.de> Cc: Eric Paris <eparis@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* new helper: file_inode(file)Al Viro2013-02-231-2/+2
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* fsnotify: pass group to fsnotify_destroy_mark()Lino Sanfilippo2012-12-111-2/+2
| | | | | | | | 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>
* fanotify: use both marks when possibleEric Paris2010-07-281-1/+1
| | | | | | | | 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>
* fsnotify: pass both the vfsmount mark and inode markEric Paris2010-07-281-7/+11
| | | | | | | | 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>
* fsnotify: remove group->maskEric Paris2010-07-281-4/+0
| | | | | | | group->mask is now useless. It was originally a shortcut for fsnotify to save on performance. These checks are now redundant, so we remove them. Signed-off-by: Eric Paris <eparis@redhat.com>
* fsnotify: cleanup should_send_eventEric Paris2010-07-281-10/+1
| | | | | | | | 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>
* dnotify: use the mark in handler functionsEric Paris2010-07-281-17/+5
| | | | | | | | dnotify now gets a mark in the should_send_event and handle_event functions. Rather than look up the mark themselves dnotify should just use the mark it was handed. Signed-off-by: Eric Paris <eparis@redhat.com>
* fsnotify: send fsnotify_mark to groups in event handling functionsEric Paris2010-07-281-1/+3
| | | | | | | | | 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>
* fsnotify: allow marks to not pin inodes in coreEric Paris2010-07-281-1/+1
| | | | | | | | | | | | | | | | | inotify marks must pin inodes in core. dnotify doesn't technically need to since they are closed when the directory is closed. fanotify also need to pin inodes in core as it works today. But the next step is to introduce the concept of 'ignored masks' which is actually a mask of events for an inode of no interest. I claim that these should be liberally sent to the kernel and should not pin the inode in core. If the inode is brought back in the listener will get an event it may have thought excluded, but this is not a serious situation and one any listener should deal with. This patch lays the ground work for non-pinning inode marks by using lazy inode pinning. We do not pin a mark until it has a non-zero mask entry. If a listener new sets a mask we never pin the inode. Signed-off-by: Eric Paris <eparis@redhat.com>
* fsnotify: split generic and inode specific mark codeEric Paris2010-07-281-6/+6
| | | | | | | | 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>
* fsnotify: take inode->i_lock inside fsnotify_find_mark_entry()Andreas Gruenbacher2010-07-281-12/+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>
* dnotify: rename mark_entry to markEric Paris2010-07-281-85/+85
| | | | | | | nomenclature change. Used to call things 'entries' but now we just call them 'marks.' Do those changes for dnotify. Signed-off-by: Eric Paris <eparis@redhat.com>
* fsnotify: rename fsnotify_find_mark_entry to fsnotify_find_markEric Paris2010-07-281-7/+7
| | | | | | the _entry portion of fsnotify functions is useless. Drop it. Signed-off-by: Eric Paris <eparis@redhat.com>
* fsnotify: rename fsnotify_mark_entry to just fsnotify_markEric Paris2010-07-281-12/+12
| | | | | | | 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>
* fsnotify: put inode specific fields in an fsnotify_mark in a unionEric Paris2010-07-281-2/+2
| | | | | | | | | 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>
* fsnotify: include vfsmount in should_send_event when appropriateEric Paris2010-07-281-2/+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>
* fsnotify: drop mask argument from fsnotify_alloc_groupEric Paris2010-07-281-1/+1
| | | | | | | Nothing uses the mask argument to fsnotify_alloc_group. This patch drops that argument. Signed-off-by: Eric Paris <eparis@redhat.com>
* fsnotify: fsnotify_obtain_group should be fsnotify_alloc_groupEric Paris2010-07-281-1/+1
| | | | | | | | fsnotify_obtain_group was intended to be able to find an already existing group. Nothing uses that functionality. This just renames it to fsnotify_alloc_group so it is clear what it is doing. Signed-off-by: Eric Paris <eparis@redhat.com>
* fsnotify: remove group_num altogetherEric Paris2010-07-281-2/+1
| | | | | | | | The original fsnotify interface has a group-num which was intended to be able to find a group after it was added. I no longer think this is a necessary thing to do and so we remove the group_num. Signed-off-by: Eric Paris <eparis@redhat.com>
* fsnotify: include data in should_send callsEric Paris2010-07-281-1/+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>
* fsnotify: provide the data type to should_send_eventEric Paris2010-07-281-1/+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>
* fsnotify: allow addition of duplicate fsnotify marksEric Paris2010-07-281-1/+1
| | | | | | | | | This patch allows a task to add a second fsnotify mark to an inode for the same group. This mark will be added to the end of the inode's list and this will never be found by the stand fsnotify_find_mark() function. This is useful if a user wants to add a new mark before removing the old one. Signed-off-by: Eric Paris <eparis@redhat.com>
* dnotify: ignore FS_EVENT_ON_CHILDAndreas Gruenbacher2009-10-211-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Mask off FS_EVENT_ON_CHILD in dnotify_handle_event(). Otherwise, when there is more than one watch on a directory and dnotify_should_send_event() succeeds, events with FS_EVENT_ON_CHILD set will trigger all watches and cause spurious events. This case was overlooked in commit e42e2773. #define _GNU_SOURCE #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <signal.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <string.h> static void create_event(int s, siginfo_t* si, void* p) { printf("create\n"); } static void delete_event(int s, siginfo_t* si, void* p) { printf("delete\n"); } int main (void) { struct sigaction action; char *tmpdir, *file; int fd1, fd2; sigemptyset (&action.sa_mask); action.sa_flags = SA_SIGINFO; action.sa_sigaction = create_event; sigaction (SIGRTMIN + 0, &action, NULL); action.sa_sigaction = delete_event; sigaction (SIGRTMIN + 1, &action, NULL); # define TMPDIR "/tmp/test.XXXXXX" tmpdir = malloc(strlen(TMPDIR) + 1); strcpy(tmpdir, TMPDIR); mkdtemp(tmpdir); # define TMPFILE "/file" file = malloc(strlen(tmpdir) + strlen(TMPFILE) + 1); sprintf(file, "%s/%s", tmpdir, TMPFILE); fd1 = open (tmpdir, O_RDONLY); fcntl(fd1, F_SETSIG, SIGRTMIN); fcntl(fd1, F_NOTIFY, DN_MULTISHOT | DN_CREATE); fd2 = open (tmpdir, O_RDONLY); fcntl(fd2, F_SETSIG, SIGRTMIN + 1); fcntl(fd2, F_NOTIFY, DN_MULTISHOT | DN_DELETE); if (fork()) { /* This triggers a create event */ creat(file, 0600); /* This triggers a create and delete event (!) */ unlink(file); } else { sleep(1); rmdir(tmpdir); } return 0; } Signed-off-by: Andreas Gruenbacher <agruen@suse.de> Signed-off-by: Eric Paris <eparis@redhat.com>
* fsnotify: use def_bool in kconfig instead of letting the user chooseEric Paris2009-07-211-1/+1
| | | | | | | | | | | fsnotify doens't give the user anything. If someone chooses inotify or dnotify it should build fsnotify, if they don't select one it shouldn't be built. This patch changes fsnotify to be a def_bool=n and makes everything else select it. Also fixes the issue people complained about on lwn where gdm hung because they didn't have inotify and they didn't get the inotify build option..... Signed-off-by: Eric Paris <eparis@redhat.com>
* fsnotify: allow groups to set freeing_mark to nullEric Paris2009-06-111-7/+1
| | | | | | | | Most fsnotify listeners (all but inotify) do not care about marks being freed. Allow groups to set freeing_mark to null and do not call any function if it is set that way. Signed-off-by: Eric Paris <eparis@redhat.com>
* inotify/dnotify: should_send_event shouldn't match on FS_EVENT_ON_CHILDEric Paris2009-06-111-0/+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>
* dnotify: do not bother to lock entry->lock when reading maskEric Paris2009-06-111-2/+1
| | | | | | | | | entry->lock is needed to make sure entry->mask does not change while manipulating it. In dnotify_should_send_event() we don't care if we get an old or a new mask value out of this entry so there is no point it taking the lock. Signed-off-by: Eric Paris <eparis@redhat.com>
* dnotify: do not use ?true:false when assigning to a boolEric Paris2009-06-111-1/+1
| | | | | | | dnotify_should send event assigned a bool using ?true:false when computing a bit operation. This is poitless and the bool type does this for us. Signed-off-by: Eric Paris <eparis@redhat.com>
* fsnotify: allow groups to add private data to eventsEric Paris2009-06-111-0/+1
| | | | | | | | | | inotify needs per group information attached to events. This patch allows groups to attach private information and implements a callback so that information can be freed when an event is being destroyed. Signed-off-by: Eric Paris <eparis@redhat.com> Acked-by: Al Viro <viro@zeniv.linux.org.uk> Cc: Christoph Hellwig <hch@lst.de>
* dnotify: reimplement dnotify using fsnotifyEric Paris2009-06-112-107/+363
| | | | | | | | Reimplement dnotify using fsnotify. Signed-off-by: Eric Paris <eparis@redhat.com> Acked-by: Al Viro <viro@zeniv.linux.org.uk> Cc: Christoph Hellwig <hch@lst.de>
* filesystem notification: create fs/notify to contain all fs notificationEric Paris2009-01-013-0/+202
Creating a generic filesystem notification interface, fsnotify, which will be used by inotify, dnotify, and eventually fanotify is really starting to clutter the fs directory. This patch simply moves inotify and dnotify into fs/notify/inotify and fs/notify/dnotify respectively to make both current fs/ and future notification tidier. Signed-off-by: Eric Paris <eparis@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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