From 1890910fd06fefbfa1cbeaf88357783914af71f6 Mon Sep 17 00:00:00 2001 From: Jeff Layton Date: Wed, 6 Jan 2016 21:26:10 -0500 Subject: [PATCH] locks: sprinkle some tracepoints around the file locking code Add some tracepoints around the POSIX locking code. These were useful when tracking down problems when handling the race between setlk and close. Signed-off-by: Jeff Layton Acked-by: "J. Bruce Fields" --- fs/locks.c | 12 +++++-- include/trace/events/filelock.h | 77 +++++++++++++++++++++++++++++++++++++++++ 2 files changed, 86 insertions(+), 3 deletions(-) diff --git a/fs/locks.c b/fs/locks.c index e72077d..0af2387 100644 --- a/fs/locks.c +++ b/fs/locks.c @@ -229,6 +229,7 @@ locks_get_lock_context(struct inode *inode, int type) ctx = smp_load_acquire(&inode->i_flctx); } out: + trace_locks_get_lock_context(inode, type, ctx); return ctx; } @@ -1141,6 +1142,8 @@ static int __posix_lock_file(struct inode *inode, struct file_lock *request, str if (new_fl2) locks_free_lock(new_fl2); locks_dispose_list(&dispose); + trace_posix_lock_inode(inode, request, error); + return error; } @@ -2164,6 +2167,8 @@ int fcntl_setlk(unsigned int fd, struct file *filp, unsigned int cmd, if (file_lock == NULL) return -ENOLCK; + inode = file_inode(filp); + /* * This might block, so we do it before checking the inode. */ @@ -2171,8 +2176,6 @@ int fcntl_setlk(unsigned int fd, struct file *filp, unsigned int cmd, if (copy_from_user(&flock, l, sizeof(flock))) goto out; - inode = file_inode(filp); - /* Don't allow mandatory locks on files that may be memory mapped * and shared. */ @@ -2241,6 +2244,7 @@ int fcntl_setlk(unsigned int fd, struct file *filp, unsigned int cmd, } } out: + trace_fcntl_setlk(inode, file_lock, error); locks_free_lock(file_lock); return error; } @@ -2397,6 +2401,7 @@ out: */ void locks_remove_posix(struct file *filp, fl_owner_t owner) { + int error; struct file_lock lock; struct file_lock_context *ctx; @@ -2419,10 +2424,11 @@ void locks_remove_posix(struct file *filp, fl_owner_t owner) lock.fl_ops = NULL; lock.fl_lmops = NULL; - vfs_lock_file(filp, F_SETLK, &lock, NULL); + error = vfs_lock_file(filp, F_SETLK, &lock, NULL); if (lock.fl_ops && lock.fl_ops->fl_release_private) lock.fl_ops->fl_release_private(&lock); + trace_locks_remove_posix(file_inode(filp), &lock, error); } EXPORT_SYMBOL(locks_remove_posix); diff --git a/include/trace/events/filelock.h b/include/trace/events/filelock.h index c72f2dc..63a7680 100644 --- a/include/trace/events/filelock.h +++ b/include/trace/events/filelock.h @@ -34,6 +34,83 @@ { F_WRLCK, "F_WRLCK" }, \ { F_UNLCK, "F_UNLCK" }) +TRACE_EVENT(locks_get_lock_context, + TP_PROTO(struct inode *inode, int type, struct file_lock_context *ctx), + + TP_ARGS(inode, type, ctx), + + TP_STRUCT__entry( + __field(unsigned long, i_ino) + __field(dev_t, s_dev) + __field(unsigned char, type) + __field(struct file_lock_context *, ctx) + ), + + TP_fast_assign( + __entry->s_dev = inode->i_sb->s_dev; + __entry->i_ino = inode->i_ino; + __entry->type = type; + __entry->ctx = ctx; + ), + + TP_printk("dev=0x%x:0x%x ino=0x%lx type=%s ctx=%p", + MAJOR(__entry->s_dev), MINOR(__entry->s_dev), + __entry->i_ino, show_fl_type(__entry->type), __entry->ctx) +); + +DECLARE_EVENT_CLASS(filelock_lock, + TP_PROTO(struct inode *inode, struct file_lock *fl, int ret), + + TP_ARGS(inode, fl, ret), + + TP_STRUCT__entry( + __field(struct file_lock *, fl) + __field(unsigned long, i_ino) + __field(dev_t, s_dev) + __field(struct file_lock *, fl_next) + __field(fl_owner_t, fl_owner) + __field(unsigned int, fl_pid) + __field(unsigned int, fl_flags) + __field(unsigned char, fl_type) + __field(loff_t, fl_start) + __field(loff_t, fl_end) + __field(int, ret) + ), + + TP_fast_assign( + __entry->fl = fl ? fl : NULL; + __entry->s_dev = inode->i_sb->s_dev; + __entry->i_ino = inode->i_ino; + __entry->fl_next = fl ? fl->fl_next : NULL; + __entry->fl_owner = fl ? fl->fl_owner : NULL; + __entry->fl_pid = fl ? fl->fl_pid : 0; + __entry->fl_flags = fl ? fl->fl_flags : 0; + __entry->fl_type = fl ? fl->fl_type : 0; + __entry->fl_start = fl ? fl->fl_start : 0; + __entry->fl_end = fl ? fl->fl_end : 0; + __entry->ret = ret; + ), + + TP_printk("fl=0x%p dev=0x%x:0x%x ino=0x%lx fl_next=0x%p fl_owner=0x%p fl_pid=%u fl_flags=%s fl_type=%s fl_start=%lld fl_end=%lld ret=%d", + __entry->fl, MAJOR(__entry->s_dev), MINOR(__entry->s_dev), + __entry->i_ino, __entry->fl_next, __entry->fl_owner, + __entry->fl_pid, show_fl_flags(__entry->fl_flags), + show_fl_type(__entry->fl_type), + __entry->fl_start, __entry->fl_end, __entry->ret) +); + +DEFINE_EVENT(filelock_lock, posix_lock_inode, + TP_PROTO(struct inode *inode, struct file_lock *fl, int ret), + TP_ARGS(inode, fl, ret)); + +DEFINE_EVENT(filelock_lock, fcntl_setlk, + TP_PROTO(struct inode *inode, struct file_lock *fl, int ret), + TP_ARGS(inode, fl, ret)); + +DEFINE_EVENT(filelock_lock, locks_remove_posix, + TP_PROTO(struct inode *inode, struct file_lock *fl, int ret), + TP_ARGS(inode, fl, ret)); + DECLARE_EVENT_CLASS(filelock_lease, TP_PROTO(struct inode *inode, struct file_lock *fl), -- 2.7.4