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Diffstat (limited to 'fs/gfs2/ops_inode.c')
-rw-r--r--fs/gfs2/ops_inode.c71
1 files changed, 60 insertions, 11 deletions
diff --git a/fs/gfs2/ops_inode.c b/fs/gfs2/ops_inode.c
index 35f6f03..534e1e2 100644
--- a/fs/gfs2/ops_inode.c
+++ b/fs/gfs2/ops_inode.c
@@ -589,6 +589,54 @@ static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode,
return 0;
}
+/*
+ * gfs2_ok_to_move - check if it's ok to move a directory to another directory
+ * @this: move this
+ * @to: to here
+ *
+ * Follow @to back to the root and make sure we don't encounter @this
+ * Assumes we already hold the rename lock.
+ *
+ * Returns: errno
+ */
+
+static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
+{
+ struct inode *dir = &to->i_inode;
+ struct super_block *sb = dir->i_sb;
+ struct inode *tmp;
+ struct qstr dotdot;
+ int error = 0;
+
+ gfs2_str2qstr(&dotdot, "..");
+
+ igrab(dir);
+
+ for (;;) {
+ if (dir == &this->i_inode) {
+ error = -EINVAL;
+ break;
+ }
+ if (dir == sb->s_root->d_inode) {
+ error = 0;
+ break;
+ }
+
+ tmp = gfs2_lookupi(dir, &dotdot, 1);
+ if (IS_ERR(tmp)) {
+ error = PTR_ERR(tmp);
+ break;
+ }
+
+ iput(dir);
+ dir = tmp;
+ }
+
+ iput(dir);
+
+ return error;
+}
+
/**
* gfs2_rename - Rename a file
* @odir: Parent directory of old file name
@@ -607,7 +655,7 @@ static int gfs2_rename(struct inode *odir, struct dentry *odentry,
struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
struct gfs2_inode *nip = NULL;
struct gfs2_sbd *sdp = GFS2_SB(odir);
- struct gfs2_holder ghs[5], r_gh;
+ struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
struct gfs2_rgrpd *nrgd;
unsigned int num_gh;
int dir_rename = 0;
@@ -621,19 +669,20 @@ static int gfs2_rename(struct inode *odir, struct dentry *odentry,
return 0;
}
- /* Make sure we aren't trying to move a dirctory into it's subdir */
- if (S_ISDIR(ip->i_inode.i_mode) && odip != ndip) {
- dir_rename = 1;
-
- error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 0,
- &r_gh);
+ if (odip != ndip) {
+ error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
+ 0, &r_gh);
if (error)
goto out;
- error = gfs2_ok_to_move(ip, ndip);
- if (error)
- goto out_gunlock_r;
+ if (S_ISDIR(ip->i_inode.i_mode)) {
+ dir_rename = 1;
+ /* don't move a dirctory into it's subdir */
+ error = gfs2_ok_to_move(ip, ndip);
+ if (error)
+ goto out_gunlock_r;
+ }
}
num_gh = 1;
@@ -829,7 +878,7 @@ out_gunlock:
gfs2_holder_uninit(ghs + x);
}
out_gunlock_r:
- if (dir_rename)
+ if (r_gh.gh_gl)
gfs2_glock_dq_uninit(&r_gh);
out:
return error;
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