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Subject[PATCH]2.5.19:fs/locks.c

The following patch addresses problem associated with
process locks when called from the cloned process created
with CLONE_THREAD flag. The fcntl locks are per-process and
creates a dead-lock for cloned (w/CLONE_THREAD) processes.
It should use tgid instead pid (same way as getpid()).

Thanks,
Saurabh Desai (sdesai@austin.ibm.com)
=======================================diff -Naur linux-2.5.19/fs/locks.c linux-2.5.19-patch/fs/locks.c
--- linux-2.5.19/fs/locks.c Wed May 29 13:42:53 2002
+++ linux-2.5.19-patch/fs/locks.c Fri May 31 13:24:12 2002
@@ -226,7 +226,7 @@

fl->fl_owner = NULL;
fl->fl_file = filp;
- fl->fl_pid = current->pid;
+ fl->fl_pid = current->tgid;
fl->fl_flags = FL_FLOCK;
fl->fl_type = type;
fl->fl_start = 0;
@@ -285,7 +285,7 @@
fl->fl_end = OFFSET_MAX;

fl->fl_owner = current->files;
- fl->fl_pid = current->pid;
+ fl->fl_pid = current->tgid;
fl->fl_file = filp;
fl->fl_flags = FL_POSIX;
fl->fl_notify = NULL;
@@ -325,7 +325,7 @@
fl->fl_end = OFFSET_MAX;

fl->fl_owner = current->files;
- fl->fl_pid = current->pid;
+ fl->fl_pid = current->tgid;
fl->fl_file = filp;
fl->fl_flags = FL_POSIX;
fl->fl_notify = NULL;
@@ -354,7 +354,7 @@
return -ENOMEM;

fl->fl_owner = current->files;
- fl->fl_pid = current->pid;
+ fl->fl_pid = current->tgid;

fl->fl_file = filp;
fl->fl_flags = FL_LEASE;
@@ -719,7 +719,7 @@
return -ENOMEM;

new_fl->fl_owner = current->files;
- new_fl->fl_pid = current->pid;
+ new_fl->fl_pid = current->tgid;
new_fl->fl_file = filp;
new_fl->fl_flags = FL_POSIX | FL_ACCESS;
new_fl->fl_type = (read_write == FLOCK_VERIFY_WRITE) ? F_WRLCK : F_RDLCK;
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