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authorBob Peterson <rpeterso@redhat.com>2008-08-12 13:39:29 -0500
committerSteven Whitehouse <swhiteho@redhat.com>2008-08-13 10:00:12 +0100
commit72dbf4790fc6736f9cb54424245114acf0b0038c (patch)
tree9ed5bd66844fa0950d947bc5673292114e58e9ac /fs/gfs2
parent9b8df98fc8973ad1c5f0d7c4cf71c7fb84fe22c5 (diff)
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GFS2: rm on multiple nodes causes panic
This patch fixes a problem whereby simultaneous unlink, rmdir, rename and link operations (e.g. rm -fR *) from multiple nodes on the same GFS2 file system can cause kernel panics, hangs, and/or memory corruption. It also gets rid of all the non-rgrp calls to gfs2_glock_nq_m. Signed-off-by: Bob Peterson <rpeterso@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2')
-rw-r--r--fs/gfs2/ops_inode.c56
1 files changed, 38 insertions, 18 deletions
diff --git a/fs/gfs2/ops_inode.c b/fs/gfs2/ops_inode.c
index e2c62f7..35f6f03 100644
--- a/fs/gfs2/ops_inode.c
+++ b/fs/gfs2/ops_inode.c
@@ -159,9 +159,13 @@ static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
- error = gfs2_glock_nq_m(2, ghs);
+ error = gfs2_glock_nq(ghs); /* parent */
if (error)
- goto out;
+ goto out_parent;
+
+ error = gfs2_glock_nq(ghs + 1); /* child */
+ if (error)
+ goto out_child;
error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
if (error)
@@ -245,8 +249,10 @@ out_alloc:
if (alloc_required)
gfs2_alloc_put(dip);
out_gunlock:
- gfs2_glock_dq_m(2, ghs);
-out:
+ gfs2_glock_dq(ghs + 1);
+out_child:
+ gfs2_glock_dq(ghs);
+out_parent:
gfs2_holder_uninit(ghs);
gfs2_holder_uninit(ghs + 1);
if (!error) {
@@ -302,7 +308,7 @@ static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
if (error)
- goto out_rgrp;
+ goto out_gunlock;
error = gfs2_trans_begin(sdp, 2*RES_DINODE + RES_LEAF + RES_RG_BIT, 0);
if (error)
@@ -316,6 +322,7 @@ static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
out_end_trans:
gfs2_trans_end(sdp);
+out_gunlock:
gfs2_glock_dq(ghs + 2);
out_rgrp:
gfs2_holder_uninit(ghs + 2);
@@ -485,7 +492,6 @@ static int gfs2_rmdir(struct inode *dir, struct dentry *dentry)
struct gfs2_holder ri_gh;
int error;
-
error = gfs2_rindex_hold(sdp, &ri_gh);
if (error)
return error;
@@ -495,9 +501,17 @@ static int gfs2_rmdir(struct inode *dir, struct dentry *dentry)
rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
- error = gfs2_glock_nq_m(3, ghs);
+ error = gfs2_glock_nq(ghs); /* parent */
if (error)
- goto out;
+ goto out_parent;
+
+ error = gfs2_glock_nq(ghs + 1); /* child */
+ if (error)
+ goto out_child;
+
+ error = gfs2_glock_nq(ghs + 2); /* rgrp */
+ if (error)
+ goto out_rgrp;
error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
if (error)
@@ -523,11 +537,15 @@ static int gfs2_rmdir(struct inode *dir, struct dentry *dentry)
gfs2_trans_end(sdp);
out_gunlock:
- gfs2_glock_dq_m(3, ghs);
-out:
- gfs2_holder_uninit(ghs);
- gfs2_holder_uninit(ghs + 1);
+ gfs2_glock_dq(ghs + 2);
+out_rgrp:
gfs2_holder_uninit(ghs + 2);
+ gfs2_glock_dq(ghs + 1);
+out_child:
+ gfs2_holder_uninit(ghs + 1);
+ gfs2_glock_dq(ghs);
+out_parent:
+ gfs2_holder_uninit(ghs);
gfs2_glock_dq_uninit(&ri_gh);
return error;
}
@@ -639,9 +657,11 @@ static int gfs2_rename(struct inode *odir, struct dentry *odentry,
gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
}
- error = gfs2_glock_nq_m(num_gh, ghs);
- if (error)
- goto out_uninit;
+ for (x = 0; x < num_gh; x++) {
+ error = gfs2_glock_nq(ghs + x);
+ if (error)
+ goto out_gunlock;
+ }
/* Check out the old directory */
@@ -804,10 +824,10 @@ out_alloc:
if (alloc_required)
gfs2_alloc_put(ndip);
out_gunlock:
- gfs2_glock_dq_m(num_gh, ghs);
-out_uninit:
- for (x = 0; x < num_gh; x++)
+ while (x--) {
+ gfs2_glock_dq(ghs + x);
gfs2_holder_uninit(ghs + x);
+ }
out_gunlock_r:
if (dir_rename)
gfs2_glock_dq_uninit(&r_gh);