diff options
Diffstat (limited to 'cmd/zed')
| -rw-r--r-- | cmd/zed/zed.c | 18 | ||||
| -rw-r--r-- | cmd/zed/zed_conf.c | 37 | ||||
| -rw-r--r-- | cmd/zed/zed_event.c | 32 | ||||
| -rw-r--r-- | cmd/zed/zed_exec.c | 22 | ||||
| -rw-r--r-- | cmd/zed/zed_file.c | 9 | ||||
| -rw-r--r-- | cmd/zed/zed_log.c | 22 | ||||
| -rw-r--r-- | cmd/zed/zed_strings.c | 4 |
7 files changed, 83 insertions, 61 deletions
diff --git a/cmd/zed/zed.c b/cmd/zed/zed.c index bf29c0486..b8dbc442c 100644 --- a/cmd/zed/zed.c +++ b/cmd/zed/zed.c @@ -91,11 +91,13 @@ _setup_sig_handlers(void) /* * Lock all current and future pages in the virtual memory address space. - * Access to locked pages will never be delayed by a page fault. + * Access to locked pages will never be delayed by a page fault. + * * EAGAIN is tested up to max_tries in case this is a transient error. + * * Note that memory locks are not inherited by a child created via fork() - * and are automatically removed during an execve(). As such, this must - * be called after the daemon fork()s (when running in the background). + * and are automatically removed during an execve(). As such, this must + * be called after the daemon fork()s (when running in the background). */ static void _lock_memory(void) @@ -121,10 +123,11 @@ _lock_memory(void) /* * Start daemonization of the process including the double fork(). + * * The parent process will block here until _finish_daemonize() is called - * (in the grandchild process), at which point the parent process will exit. - * This prevents the parent process from exiting until initialization is - * complete. + * (in the grandchild process), at which point the parent process will exit. + * This prevents the parent process from exiting until initialization is + * complete. */ static void _start_daemonize(void) @@ -182,8 +185,9 @@ _start_daemonize(void) /* * Finish daemonization of the process by closing stdin/stdout/stderr. + * * This must be called at the end of initialization after all external - * communication channels are established and accessible. + * communication channels are established and accessible. */ static void _finish_daemonize(void) diff --git a/cmd/zed/zed_conf.c b/cmd/zed/zed_conf.c index cf68c06fe..77f772ad5 100644 --- a/cmd/zed/zed_conf.c +++ b/cmd/zed/zed_conf.c @@ -86,6 +86,7 @@ nomem: /* * Destroy the configuration [zcp]. + * * Note: zfs_hdl & zevent_fd are destroyed via zed_event_fini(). */ void @@ -126,8 +127,9 @@ zed_conf_destroy(struct zed_conf *zcp) /* * Display command-line help and exit. + * * If [got_err] is 0, output to stdout and exit normally; - * otherwise, output to stderr and exit with a failure status. + * otherwise, output to stderr and exit with a failure status. */ static void _zed_conf_display_help(const char *prog, int got_err) @@ -307,6 +309,7 @@ zed_conf_parse_opts(struct zed_conf *zcp, int argc, char **argv) /* * Parse the configuration file into the configuration [zcp]. + * * FIXME: Not yet implemented. */ void @@ -318,10 +321,12 @@ zed_conf_parse_file(struct zed_conf *zcp) /* * Scan the [zcp] script_dir for files to exec based on the event class. - * Files must be executable by user, but not writable by group or other. - * Dotfiles are ignored. + * Files must be executable by user, but not writable by group or other. + * Dotfiles are ignored. + * * Return 0 on success with an updated set of scripts, - * or -1 on error with errno set. + * or -1 on error with errno set. + * * FIXME: Check if script_dir and all parent dirs are secure. */ int @@ -430,13 +435,15 @@ zed_conf_scan_dir(struct zed_conf *zcp) /* * Write the PID file specified in [zcp]. * Return 0 on success, -1 on error. + * * This must be called after fork()ing to become a daemon (so the correct PID - * is recorded), but before daemonization is complete and the parent process - * exits (for synchronization with systemd). + * is recorded), but before daemonization is complete and the parent process + * exits (for synchronization with systemd). + * * FIXME: Only update the PID file after verifying the PID previously stored - * in the PID file no longer exists or belongs to a foreign process - * in order to ensure the daemon cannot be started more than once. - * (This check is currently done by zed_conf_open_state().) + * in the PID file no longer exists or belongs to a foreign process + * in order to ensure the daemon cannot be started more than once. + * (This check is currently done by zed_conf_open_state().) */ int zed_conf_write_pid(struct zed_conf *zcp) @@ -497,6 +504,7 @@ zed_conf_write_pid(struct zed_conf *zcp) /* * Open and lock the [zcp] state_file. * Return 0 on success, -1 on error. + * * FIXME: If state_file exists, verify ownership & permissions. * FIXME: Move lock to pid_file instead. */ @@ -577,11 +585,9 @@ zed_conf_open_state(struct zed_conf *zcp) } /* - * Read the opened [zcp] state_file to obtain the eid & etime - * of the last event processed. - * Write the state from the last event to the [eidp] & [etime] args - * passed by reference. - * Note that etime[] is an array of size 2. + * Read the opened [zcp] state_file to obtain the eid & etime of the last event + * processed. Write the state from the last event to the [eidp] & [etime] args + * passed by reference. Note that etime[] is an array of size 2. * Return 0 on success, -1 on error. */ int @@ -631,8 +637,7 @@ zed_conf_read_state(struct zed_conf *zcp, uint64_t *eidp, int64_t etime[]) /* * Write the [eid] & [etime] of the last processed event to the opened - * [zcp] state_file. - * Note that etime[] is an array of size 2. + * [zcp] state_file. Note that etime[] is an array of size 2. * Return 0 on success, -1 on error. */ int diff --git a/cmd/zed/zed_event.c b/cmd/zed/zed_event.c index e504aefb9..940172bc3 100644 --- a/cmd/zed/zed_event.c +++ b/cmd/zed/zed_event.c @@ -86,12 +86,13 @@ zed_event_fini(struct zed_conf *zcp) /* * Seek to the event specified by [saved_eid] and [saved_etime]. - * This protects against processing a given event more than once. + * This protects against processing a given event more than once. * Return 0 upon a successful seek to the specified event, or -1 otherwise. + * * A zevent is considered to be uniquely specified by its (eid,time) tuple. - * The unsigned 64b eid is set to 1 when the kernel module is loaded, and - * incremented by 1 for each new event. Since the state file can persist - * across a kernel module reload, the time must be checked to ensure a match. + * The unsigned 64b eid is set to 1 when the kernel module is loaded, and + * incremented by 1 for each new event. Since the state file can persist + * across a kernel module reload, the time must be checked to ensure a match. */ int zed_event_seek(struct zed_conf *zcp, uint64_t saved_eid, int64_t saved_etime[]) @@ -427,8 +428,9 @@ _zed_event_value_is_hex(const char *name) /* * Convert the nvpair [nvp] to a string which is added to the environment - * of the child process. + * of the child process. * Return 0 on success, -1 on error. + * * FIXME: Refactor with cmd/zpool/zpool_main.c:zpool_do_events_nvprint()? */ static void @@ -639,7 +641,8 @@ _zed_event_add_var(uint64_t eid, zed_strings_t *zsp, const char *fmt, ...) /* * Restrict various environment variables to safe and sane values - * when constructing the environment for the child process. + * when constructing the environment for the child process. + * * Reference: Secure Programming Cookbook by Viega & Messier, Section 1.1. */ static void @@ -669,7 +672,8 @@ _zed_event_add_env_restrict(uint64_t eid, zed_strings_t *zsp) /* * Preserve specified variables from the parent environment - * when constructing the environment for the child process. + * when constructing the environment for the child process. + * * Reference: Secure Programming Cookbook by Viega & Messier, Section 1.1. */ static void @@ -692,9 +696,9 @@ _zed_event_add_env_preserve(uint64_t eid, zed_strings_t *zsp) /* * Compute the "subclass" by removing the first 3 components of [class] - * (which seem to always be either "ereport.fs.zfs" or "resource.fs.zfs"). + * (which seem to always be either "ereport.fs.zfs" or "resource.fs.zfs"). * Return a pointer inside the string [class], or NULL if insufficient - * components exist. + * components exist. */ static const char * _zed_event_get_subclass(const char *class) @@ -717,10 +721,10 @@ _zed_event_get_subclass(const char *class) /* * Convert the zevent time from a 2-element array of 64b integers - * into a more convenient form: - * TIME_SECS is the second component of the time. - * TIME_NSECS is the nanosecond component of the time. - * TIME_STRING is an almost-RFC3339-compliant string representation. + * into a more convenient form: + * - TIME_SECS is the second component of the time. + * - TIME_NSECS is the nanosecond component of the time. + * - TIME_STRING is an almost-RFC3339-compliant string representation. */ static void _zed_event_add_time_strings(uint64_t eid, zed_strings_t *zsp, int64_t etime[]) @@ -781,7 +785,7 @@ zed_event_service(struct zed_conf *zcp) zed_log_msg(LOG_WARNING, "Missed %d events", n_dropped); /* * FIXME: Increase max size of event nvlist in - * /sys/module/zfs/parameters/zfs_zevent_len_max ? + * /sys/module/zfs/parameters/zfs_zevent_len_max ? */ } if (nvlist_lookup_uint64(nvl, "eid", &eid) != 0) { diff --git a/cmd/zed/zed_exec.c b/cmd/zed/zed_exec.c index f461b7840..09b928dd5 100644 --- a/cmd/zed/zed_exec.c +++ b/cmd/zed/zed_exec.c @@ -41,7 +41,7 @@ /* * Create an environment string array for passing to execve() using the - * NAME=VALUE strings in container [zsp]. + * NAME=VALUE strings in container [zsp]. * Return a newly-allocated environment, or NULL on error. */ static char ** @@ -82,9 +82,10 @@ _zed_exec_create_env(zed_strings_t *zsp) /* * Fork a child process to handle event [eid]. The program [prog] - * in directory [dir] is executed with the envionment [env]. + * in directory [dir] is executed with the envionment [env]. + * * The file descriptor [zfd] is the zevent_fd used to track the - * current cursor location within the zevent nvlist. + * current cursor location within the zevent nvlist. */ static void _zed_exec_fork_child(uint64_t eid, const char *dir, const char *prog, @@ -156,14 +157,17 @@ restart: /* * Process the event [eid] by synchronously invoking all scripts with a - * matching class prefix. + * matching class prefix. + * * Each executable in [scripts] from the directory [dir] is matched against - * the event's [class], [subclass], and the "all" class (which matches - * all events). Every script with a matching class prefix is invoked. - * The NAME=VALUE strings in [envs] will be passed to the script as - * environment variables. + * the event's [class], [subclass], and the "all" class (which matches + * all events). Every script with a matching class prefix is invoked. + * The NAME=VALUE strings in [envs] will be passed to the script as + * environment variables. + * * The file descriptor [zfd] is the zevent_fd used to track the - * current cursor location within the zevent nvlist. + * current cursor location within the zevent nvlist. + * * Return 0 on success, -1 on error. */ int diff --git a/cmd/zed/zed_file.c b/cmd/zed/zed_file.c index 3d62f9fe4..354f67d24 100644 --- a/cmd/zed/zed_file.c +++ b/cmd/zed/zed_file.c @@ -93,7 +93,7 @@ zed_file_write_n(int fd, void *buf, size_t n) /* * Set an exclusive advisory lock on the open file descriptor [fd]. * Return 0 on success, 1 if a conflicting lock is held by another process, - * or -1 on error (with errno set). + * or -1 on error (with errno set). */ int zed_file_lock(int fd) @@ -144,9 +144,9 @@ zed_file_unlock(int fd) /* * Test whether an exclusive advisory lock could be obtained for the open - * file descriptor [fd]. + * file descriptor [fd]. * Return 0 if the file is not locked, >0 for the PID of another process - * holding a conflicting lock, or -1 on error (with errno set). + * holding a conflicting lock, or -1 on error (with errno set). */ pid_t zed_file_is_locked(int fd) @@ -201,8 +201,9 @@ zed_file_close_from(int lowfd) /* * Set the CLOEXEC flag on file descriptor [fd] so it will be automatically - * closed upon successful execution of one of the exec functions. + * closed upon successful execution of one of the exec functions. * Return 0 on success, or -1 on error. + * * FIXME: No longer needed? */ int diff --git a/cmd/zed/zed_log.c b/cmd/zed/zed_log.c index c2bc25edc..d150877d0 100644 --- a/cmd/zed/zed_log.c +++ b/cmd/zed/zed_log.c @@ -71,7 +71,7 @@ zed_log_fini(void) /* * Create pipe for communicating daemonization status between the parent and - * child processes across the double-fork(). + * child processes across the double-fork(). */ void zed_log_pipe_open(void) @@ -87,8 +87,9 @@ zed_log_pipe_open(void) /* * Close the read-half of the daemonize pipe. + * * This should be called by the child after fork()ing from the parent since - * the child will never read from this pipe. + * the child will never read from this pipe. */ void zed_log_pipe_close_reads(void) @@ -108,10 +109,12 @@ zed_log_pipe_close_reads(void) /* * Close the write-half of the daemonize pipe. + * * This should be called by the parent after fork()ing its child since the - * parent will never write to this pipe. + * parent will never write to this pipe. + * * This should also be called by the child once initialization is complete - * in order to signal the parent that it can safely exit. + * in order to signal the parent that it can safely exit. */ void zed_log_pipe_close_writes(void) @@ -131,9 +134,10 @@ zed_log_pipe_close_writes(void) /* * Block on reading from the daemonize pipe until signaled by the child - * (via zed_log_pipe_close_writes()) that initialization is complete. + * (via zed_log_pipe_close_writes()) that initialization is complete. + * * This should only be called by the parent while waiting to exit after - * fork()ing the child. + * fork()ing the child. */ void zed_log_pipe_wait(void) @@ -162,7 +166,7 @@ zed_log_pipe_wait(void) /* * Start logging messages at the syslog [priority] level or higher to stderr. - * Refer to syslog(3) for valid priority values. + * Refer to syslog(3) for valid priority values. */ void zed_log_stderr_open(int priority) @@ -183,7 +187,7 @@ zed_log_stderr_close(void) /* * Start logging messages to syslog. - * Refer to syslog(3) for valid option/facility values. + * Refer to syslog(3) for valid option/facility values. */ void zed_log_syslog_open(int facility) @@ -231,7 +235,7 @@ _zed_log_aux(int priority, const char *fmt, va_list vargs) /* * Log a message at the given [priority] level specified by the printf-style - * format string [fmt]. + * format string [fmt]. */ void zed_log_msg(int priority, const char *fmt, ...) diff --git a/cmd/zed/zed_strings.c b/cmd/zed/zed_strings.c index 05a374055..9b55d0346 100644 --- a/cmd/zed/zed_strings.c +++ b/cmd/zed/zed_strings.c @@ -47,8 +47,7 @@ typedef struct zed_strings_node zed_strings_node_t; /* * Compare zed_strings_node_t nodes [x1] and [x2]. - * As required for the AVL tree, return exactly - * -1 for <, 0 for ==, and +1 for >. + * As required for the AVL tree, return -1 for <, 0 for ==, and +1 for >. */ static int _zed_strings_node_compare(const void *x1, const void *x2) @@ -118,6 +117,7 @@ zed_strings_destroy(zed_strings_t *zsp) /* * Add a copy of the string [s] to the container [zsp]. * Return 0 on success, or -1 on error. + * * FIXME: Handle dup strings. */ int |