From: J. Bruce Fields Date: Thu, 7 Feb 2008 08:13:35 +0000 (-0800) Subject: Documentation: move dnotify.txt to filesystems/ X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=e9b1a4d160f68397d29183ce76af1cc774508aba;p=openwrt%2Fstaging%2Fblogic.git Documentation: move dnotify.txt to filesystems/ I'm inclined to think dnotify belongs in filesystems/. Signed-off-by: J. Bruce Fields Acked-by: Randy Dunlap Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/Documentation/00-INDEX b/Documentation/00-INDEX index c1067e48b529..bb5e21034209 100644 --- a/Documentation/00-INDEX +++ b/Documentation/00-INDEX @@ -126,8 +126,6 @@ devices.txt - plain ASCII listing of all the nodes in /dev/ with major minor #'s. digiepca.txt - info on Digi Intl. {PC,PCI,EISA}Xx and Xem series cards. -dnotify.txt - - info about directory notification in Linux. dontdiff - file containing a list of files that should never be diff'ed. driver-model/ diff --git a/Documentation/dnotify.txt b/Documentation/dnotify.txt deleted file mode 100644 index 6984fca6002a..000000000000 --- a/Documentation/dnotify.txt +++ /dev/null @@ -1,99 +0,0 @@ - Linux Directory Notification - ============================ - - Stephen Rothwell - -The intention of directory notification is to allow user applications -to be notified when a directory, or any of the files in it, are changed. -The basic mechanism involves the application registering for notification -on a directory using a fcntl(2) call and the notifications themselves -being delivered using signals. - -The application decides which "events" it wants to be notified about. -The currently defined events are: - - DN_ACCESS A file in the directory was accessed (read) - DN_MODIFY A file in the directory was modified (write,truncate) - DN_CREATE A file was created in the directory - DN_DELETE A file was unlinked from directory - DN_RENAME A file in the directory was renamed - DN_ATTRIB A file in the directory had its attributes - changed (chmod,chown) - -Usually, the application must reregister after each notification, but -if DN_MULTISHOT is or'ed with the event mask, then the registration will -remain until explicitly removed (by registering for no events). - -By default, SIGIO will be delivered to the process and no other useful -information. However, if the F_SETSIG fcntl(2) call is used to let the -kernel know which signal to deliver, a siginfo structure will be passed to -the signal handler and the si_fd member of that structure will contain the -file descriptor associated with the directory in which the event occurred. - -Preferably the application will choose one of the real time signals -(SIGRTMIN + ) so that the notifications may be queued. This is -especially important if DN_MULTISHOT is specified. Note that SIGRTMIN -is often blocked, so it is better to use (at least) SIGRTMIN + 1. - -Implementation expectations (features and bugs :-)) ---------------------------- - -The notification should work for any local access to files even if the -actual file system is on a remote server. This implies that remote -access to files served by local user mode servers should be notified. -Also, remote accesses to files served by a local kernel NFS server should -be notified. - -In order to make the impact on the file system code as small as possible, -the problem of hard links to files has been ignored. So if a file (x) -exists in two directories (a and b) then a change to the file using the -name "a/x" should be notified to a program expecting notifications on -directory "a", but will not be notified to one expecting notifications on -directory "b". - -Also, files that are unlinked, will still cause notifications in the -last directory that they were linked to. - -Configuration -------------- - -Dnotify is controlled via the CONFIG_DNOTIFY configuration option. When -disabled, fcntl(fd, F_NOTIFY, ...) will return -EINVAL. - -Example -------- - - #define _GNU_SOURCE /* needed to get the defines */ - #include /* in glibc 2.2 this has the needed - values defined */ - #include - #include - #include - - static volatile int event_fd; - - static void handler(int sig, siginfo_t *si, void *data) - { - event_fd = si->si_fd; - } - - int main(void) - { - struct sigaction act; - int fd; - - act.sa_sigaction = handler; - sigemptyset(&act.sa_mask); - act.sa_flags = SA_SIGINFO; - sigaction(SIGRTMIN + 1, &act, NULL); - - fd = open(".", O_RDONLY); - fcntl(fd, F_SETSIG, SIGRTMIN + 1); - fcntl(fd, F_NOTIFY, DN_MODIFY|DN_CREATE|DN_MULTISHOT); - /* we will now be notified if any of the files - in "." is modified or new files are created */ - while (1) { - pause(); - printf("Got event on fd=%d\n", event_fd); - } - } diff --git a/Documentation/filesystems/00-INDEX b/Documentation/filesystems/00-INDEX index 1de155e2dc36..632fe3f376eb 100644 --- a/Documentation/filesystems/00-INDEX +++ b/Documentation/filesystems/00-INDEX @@ -32,6 +32,8 @@ directory-locking - info about the locking scheme used for directory operations. dlmfs.txt - info on the userspace interface to the OCFS2 DLM. +dnotify.txt + - info about directory notification in Linux. ecryptfs.txt - docs on eCryptfs: stacked cryptographic filesystem for Linux. ext2.txt diff --git a/Documentation/filesystems/dnotify.txt b/Documentation/filesystems/dnotify.txt new file mode 100644 index 000000000000..9f5d338ddbb8 --- /dev/null +++ b/Documentation/filesystems/dnotify.txt @@ -0,0 +1,99 @@ + Linux Directory Notification + ============================ + + Stephen Rothwell + +The intention of directory notification is to allow user applications +to be notified when a directory, or any of the files in it, are changed. +The basic mechanism involves the application registering for notification +on a directory using a fcntl(2) call and the notifications themselves +being delivered using signals. + +The application decides which "events" it wants to be notified about. +The currently defined events are: + + DN_ACCESS A file in the directory was accessed (read) + DN_MODIFY A file in the directory was modified (write,truncate) + DN_CREATE A file was created in the directory + DN_DELETE A file was unlinked from directory + DN_RENAME A file in the directory was renamed + DN_ATTRIB A file in the directory had its attributes + changed (chmod,chown) + +Usually, the application must reregister after each notification, but +if DN_MULTISHOT is or'ed with the event mask, then the registration will +remain until explicitly removed (by registering for no events). + +By default, SIGIO will be delivered to the process and no other useful +information. However, if the F_SETSIG fcntl(2) call is used to let the +kernel know which signal to deliver, a siginfo structure will be passed to +the signal handler and the si_fd member of that structure will contain the +file descriptor associated with the directory in which the event occurred. + +Preferably the application will choose one of the real time signals +(SIGRTMIN + ) so that the notifications may be queued. This is +especially important if DN_MULTISHOT is specified. Note that SIGRTMIN +is often blocked, so it is better to use (at least) SIGRTMIN + 1. + +Implementation expectations (features and bugs :-)) +--------------------------- + +The notification should work for any local access to files even if the +actual file system is on a remote server. This implies that remote +access to files served by local user mode servers should be notified. +Also, remote accesses to files served by a local kernel NFS server should +be notified. + +In order to make the impact on the file system code as small as possible, +the problem of hard links to files has been ignored. So if a file (x) +exists in two directories (a and b) then a change to the file using the +name "a/x" should be notified to a program expecting notifications on +directory "a", but will not be notified to one expecting notifications on +directory "b". + +Also, files that are unlinked, will still cause notifications in the +last directory that they were linked to. + +Configuration +------------- + +Dnotify is controlled via the CONFIG_DNOTIFY configuration option. When +disabled, fcntl(fd, F_NOTIFY, ...) will return -EINVAL. + +Example +------- + + #define _GNU_SOURCE /* needed to get the defines */ + #include /* in glibc 2.2 this has the needed + values defined */ + #include + #include + #include + + static volatile int event_fd; + + static void handler(int sig, siginfo_t *si, void *data) + { + event_fd = si->si_fd; + } + + int main(void) + { + struct sigaction act; + int fd; + + act.sa_sigaction = handler; + sigemptyset(&act.sa_mask); + act.sa_flags = SA_SIGINFO; + sigaction(SIGRTMIN + 1, &act, NULL); + + fd = open(".", O_RDONLY); + fcntl(fd, F_SETSIG, SIGRTMIN + 1); + fcntl(fd, F_NOTIFY, DN_MODIFY|DN_CREATE|DN_MULTISHOT); + /* we will now be notified if any of the files + in "." is modified or new files are created */ + while (1) { + pause(); + printf("Got event on fd=%d\n", event_fd); + } + }