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| author | Abhijith Das <adas@redhat.com> | 2007-09-13 23:35:27 -0500 |
|---|---|---|
| committer | Steven Whitehouse <swhiteho@redhat.com> | 2007-10-10 08:56:14 +0100 |
| commit | b4c20166dcfca106f0f416bfce200099ed76ab18 (patch) | |
| tree | 474e8c3bda161953202793c0801ab00a5b5433de /fs/gfs2/glock.h | |
| parent | 1ad38c437fa33f85ba4b6a85ea8c5478ee72d5bd (diff) | |
| download | blackbird-op-linux-b4c20166dcfca106f0f416bfce200099ed76ab18.tar.gz blackbird-op-linux-b4c20166dcfca106f0f416bfce200099ed76ab18.zip | |
[GFS2] flocks from same process trip kernel BUG at fs/gfs2/glock.c:1118!
This patch adds a new flag to the gfs2_holder structure GL_FLOCK.
It is set on holders of glocks representing flocks. This flag is
checked in add_to_queue() and a process is permitted to queue more
than one holder onto a glock if it is set. This solves the issue
of a process not being able to do multiple flocks on the same file.
Through a single descriptor, a process can now promote and demote
flocks. Through multiple descriptors a process can now queue
multiple flocks on the same file. There's still the problem of
a process deadlocking itself (because gfs2 blocking locks are not
interruptible) by queueing incompatible deadlock.
Signed-off-by: Abhijith Das <adas@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2/glock.h')
| -rw-r--r-- | fs/gfs2/glock.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/gfs2/glock.h b/fs/gfs2/glock.h index f7a8e626aa08..b16f604eea9f 100644 --- a/fs/gfs2/glock.h +++ b/fs/gfs2/glock.h @@ -26,6 +26,7 @@ #define GL_SKIP 0x00000100 #define GL_ATIME 0x00000200 #define GL_NOCACHE 0x00000400 +#define GL_FLOCK 0x00000800 #define GL_NOCANCEL 0x00001000 #define GLR_TRYFAILED 13 |
