From: Rafał Miłecki <[email protected]> With this change block generates 2 "mount" hotplug.d subsystem events: 1) "add" when block device gets mounted 2) "remove" when block device gets unmounted
This allows e.g. controlling USB storage dependant software using hotplug.d listeners. A very similar solution was implemented in mountd which was replaced by blockd. Right now this is implemented using a call to the /sbin/hotplug-call. A possible improvement is to rewrite above shell script into a C lib function. For now let's just assume that script exists. Signed-off-by: Rafał Miłecki <[email protected]> --- V2: Use hotplug_call() helper. It requires [PATCH libubox] hotplug: add hotplug_call() helper V3: Switch back to the local hotplug-call call as it doesn't really fit the library. Use setenv() which simplifies the code. Improve error handling. --- block.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/block.c b/block.c index 46050b4..8972fdf 100644 --- a/block.c +++ b/block.c @@ -880,6 +880,35 @@ static int exec_mount(const char *source, const char *target, return err; } +static int hotplug_call_mount(const char *action, const char *device) +{ + pid_t pid; + int err; + + pid = fork(); + if (!pid) { + char * const argv[] = { "hotplug-call", "mount", NULL }; + + setenv("ACTION", action, 1); + setenv("DEVICE", device, 1); + + execv("/sbin/hotplug-call", argv); + exit(-1); + } else if (pid > 0) { + int status; + + pid = waitpid(pid, &status, 0); + if (pid <= 0 || !WIFEXITED(status) || WEXITSTATUS(status)) { + err = -ENOEXEC; + ULOG_ERR("hotplug-call call failed\n"); + } + } else { + err = -errno; + } + + return err; +} + static int handle_mount(const char *source, const char *target, const char *fstype, struct mount *m) { @@ -1079,6 +1108,8 @@ static int mount_device(struct probe_info *pr, int type) handle_swapfiles(true); + hotplug_call_mount("add", device); + return 0; } @@ -1091,6 +1122,8 @@ static int umount_device(char *path) if (!mp) return -1; + hotplug_call_mount("remove", basename(path)); + err = umount2(mp, MNT_DETACH); if (err) ULOG_ERR("unmounting %s (%s) failed (%d) - %m\n", path, mp, -- 2.13.7 _______________________________________________ openwrt-devel mailing list [email protected] https://lists.openwrt.org/mailman/listinfo/openwrt-devel
