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authorSteven Whitehouse <swhiteho@redhat.com>2007-01-22 12:10:39 -0500
committerSteven Whitehouse <swhiteho@redhat.com>2007-02-05 13:37:20 -0500
commit1c0f4872dc4bbeb2223a300517099786211fce83 (patch)
tree21e4c880e68751dabecfc0d77ff226ec6fcb6951 /fs/gfs2/glock.c
parent6bd9c8c2fb99d1f5af6201db2f063c1d754c230a (diff)
downloadop-kernel-dev-1c0f4872dc4bbeb2223a300517099786211fce83.zip
op-kernel-dev-1c0f4872dc4bbeb2223a300517099786211fce83.tar.gz
[GFS2] Remove local exclusive glock mode
Here is a patch for GFS2 to remove the local exclusive flag. In the places it was used, mutex's are always held earlier in the call path, so it appears redundant in the LM_ST_SHARED case. Also, the GFS2 holders were setting local exclusive in any case where the requested lock was LM_ST_EXCLUSIVE. So the other places in the glock code where the flag was tested have been replaced with tests for the lock state being LM_ST_EXCLUSIVE in order to ensure the logic is the same as before (i.e. LM_ST_EXCLUSIVE is always locally exclusive as well as globally exclusive). Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2/glock.c')
-rw-r--r--fs/gfs2/glock.c16
1 files changed, 3 insertions, 13 deletions
diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index 8e4b55a..1345c3d 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -391,10 +391,6 @@ void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, unsigned flags,
gh->gh_flags = flags;
gh->gh_error = 0;
gh->gh_iflags = 0;
-
- if (gh->gh_state == LM_ST_EXCLUSIVE)
- gh->gh_flags |= GL_LOCAL_EXCL;
-
gfs2_glock_hold(gl);
}
@@ -412,9 +408,6 @@ void gfs2_holder_reinit(unsigned int state, unsigned flags, struct gfs2_holder *
{
gh->gh_state = state;
gh->gh_flags = flags;
- if (gh->gh_state == LM_ST_EXCLUSIVE)
- gh->gh_flags |= GL_LOCAL_EXCL;
-
gh->gh_iflags &= 1 << HIF_ALLOCED;
gh->gh_ip = (unsigned long)__builtin_return_address(0);
}
@@ -557,11 +550,11 @@ static int rq_promote(struct gfs2_holder *gh)
set_bit(GLF_LOCK, &gl->gl_flags);
} else {
struct gfs2_holder *next_gh;
- if (gh->gh_flags & GL_LOCAL_EXCL)
+ if (gh->gh_state == LM_ST_EXCLUSIVE)
return 1;
next_gh = list_entry(gl->gl_holders.next, struct gfs2_holder,
gh_list);
- if (next_gh->gh_flags & GL_LOCAL_EXCL)
+ if (next_gh->gh_state == LM_ST_EXCLUSIVE)
return 1;
}
@@ -1363,10 +1356,7 @@ static int glock_compare(const void *arg_a, const void *arg_b)
return 1;
if (a->ln_number < b->ln_number)
return -1;
- if (gh_a->gh_state == LM_ST_SHARED && gh_b->gh_state == LM_ST_EXCLUSIVE)
- return 1;
- if (!(gh_a->gh_flags & GL_LOCAL_EXCL) && (gh_b->gh_flags & GL_LOCAL_EXCL))
- return 1;
+ BUG_ON(gh_a->gh_gl->gl_ops->go_type == gh_b->gh_gl->gl_ops->go_type);
return 0;
}
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