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| author | Jeff Layton <jlayton@poochiereds.net> | 2014-05-09 20:13:05 +0200 |
|---|---|---|
| committer | Jeff Layton <jlayton@poochiereds.net> | 2014-06-02 14:09:30 +0200 |
| commit | 62af4f1f7df44ea0bb1a11c94ac9fb384bf1c564 (patch) | |
| tree | 5fdc044c1d7eed924a90d101a306ba53617ebac2 /fs/locks.c | |
| parent | fs/locks.c: replace seq_printf by seq_puts (diff) | |
| download | linux-62af4f1f7df44ea0bb1a11c94ac9fb384bf1c564.tar.xz linux-62af4f1f7df44ea0bb1a11c94ac9fb384bf1c564.zip | |
locks: add some tracepoints in the lease handling code
v2: add a __break_lease tracepoint for non-blocking case
Recently, I needed these to help track down a softlockup when recalling a
delegation, but they might be helpful in other situations as well.
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Signed-off-by: Jeff Layton <jlayton@poochiereds.net>
Diffstat (limited to 'fs/locks.c')
| -rw-r--r-- | fs/locks.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/fs/locks.c b/fs/locks.c index facf76d9fcb4..da57c9b7e844 100644 --- a/fs/locks.c +++ b/fs/locks.c @@ -130,6 +130,9 @@ #include <linux/percpu.h> #include <linux/lglock.h> +#define CREATE_TRACE_POINTS +#include <trace/events/filelock.h> + #include <asm/uaccess.h> #define IS_POSIX(fl) (fl->fl_flags & FL_POSIX) @@ -1287,6 +1290,7 @@ static void time_out_leases(struct inode *inode) before = &inode->i_flock; while ((fl = *before) && IS_LEASE(fl) && lease_breaking(fl)) { + trace_time_out_leases(inode, fl); if (past_time(fl->fl_downgrade_time)) lease_modify(before, F_RDLCK); if (past_time(fl->fl_break_time)) @@ -1374,6 +1378,7 @@ int __break_lease(struct inode *inode, unsigned int mode, unsigned int type) } if (i_have_this_lease || (mode & O_NONBLOCK)) { + trace_break_lease_noblock(inode, new_fl); error = -EWOULDBLOCK; goto out; } @@ -1385,10 +1390,12 @@ restart: if (break_time == 0) break_time++; locks_insert_block(flock, new_fl); + trace_break_lease_block(inode, new_fl); spin_unlock(&inode->i_lock); error = wait_event_interruptible_timeout(new_fl->fl_wait, !new_fl->fl_next, break_time); spin_lock(&inode->i_lock); + trace_break_lease_unblock(inode, new_fl); locks_delete_block(new_fl); if (error >= 0) { if (error == 0) @@ -1510,6 +1517,8 @@ static int generic_add_lease(struct file *filp, long arg, struct file_lock **flp int error; lease = *flp; + trace_generic_add_lease(inode, lease); + /* * In the delegation case we need mutual exclusion with * a number of operations that take the i_mutex. We trylock @@ -1599,6 +1608,8 @@ static int generic_delete_lease(struct file *filp, struct file_lock **flp) struct dentry *dentry = filp->f_path.dentry; struct inode *inode = dentry->d_inode; + trace_generic_delete_lease(inode, *flp); + for (before = &inode->i_flock; ((fl = *before) != NULL) && IS_LEASE(fl); before = &fl->fl_next) { |