1. 21 10月, 2009 1 次提交
    • A
      dnotify: ignore FS_EVENT_ON_CHILD · 94552684
      Andreas Gruenbacher 提交于
      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: NAndreas Gruenbacher <agruen@suse.de>
      Signed-off-by: NEric Paris <eparis@redhat.com>
      94552684
  2. 19 10月, 2009 3 次提交
    • W
      inotify: fix coalesce duplicate events into a single event in special case · 3de0ef4f
      Wei Yongjun 提交于
      If we do rename a dir entry, like this:
      
        rename("/tmp/ino7UrgoJ.rename1", "/tmp/ino7UrgoJ.rename2")
        rename("/tmp/ino7UrgoJ.rename2", "/tmp/ino7UrgoJ")
      
      The duplicate events should be coalesced into a single event. But those two
      events do not be coalesced into a single event, due to some bad check in
      event_compare(). It can not match the two NULL inodes as the same event.
      Signed-off-by: NWei Yongjun <yjwei@cn.fujitsu.com>
      Signed-off-by: NEric Paris <eparis@redhat.com>
      3de0ef4f
    • E
      inotify: deprecate the inotify kernel interface · cdc321ff
      Eric Paris 提交于
      In 2.6.33 there will be no users of the inotify interface.  Mark it for
      removal as fsnotify is more generic and is easier to use.
      Signed-off-by: NEric Paris <eparis@redhat.com>
      cdc321ff
    • E
      fsnotify: do not set group for a mark before it is on the i_list · 9f0d793b
      Eric Paris 提交于
      fsnotify_add_mark is supposed to add a mark to the g_list and i_list and to
      set the group and inode for the mark.  fsnotify_destroy_mark_by_entry uses
      the fact that ->group != NULL to know if this group should be destroyed or
      if it's already been done.
      
      But fsnotify_add_mark sets the group and inode before it actually adds the
      mark to the i_list and g_list.  This can result in a race in inotify, it
      requires 3 threads.
      
      sys_inotify_add_watch("file")	sys_inotify_add_watch("file")	sys_inotify_rm_watch([a])
      inotify_update_watch()
      inotify_new_watch()
      inotify_add_to_idr()
         ^--- returns wd = [a]
      				inotfiy_update_watch()
      				inotify_new_watch()
      				inotify_add_to_idr()
      				fsnotify_add_mark()
      				   ^--- returns wd = [b]
      				returns to userspace;
      								inotify_idr_find([a])
      								   ^--- gives us the pointer from task 1
      fsnotify_add_mark()
         ^--- this is going to set the mark->group and mark->inode fields, but will
      return -EEXIST because of the race with [b].
      								fsnotify_destroy_mark()
      								   ^--- since ->group != NULL we call back
      									into inotify_freeing_mark() which calls
      								inotify_remove_from_idr([a])
      
      since fsnotify_add_mark() failed we call:
      inotify_remove_from_idr([a])     <------WHOOPS it's not in the idr, this could
      					have been any entry added later!
      
      The fix is to make sure we don't set mark->group until we are sure the mark is
      on the inode and fsnotify_add_mark will return success.
      Signed-off-by: NEric Paris <eparis@redhat.com>
      9f0d793b
  3. 17 10月, 2009 3 次提交
  4. 16 10月, 2009 23 次提交
  5. 15 10月, 2009 10 次提交