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Diffstat (limited to 'fs/gfs2/ops_inode.c')
-rw-r--r--fs/gfs2/ops_inode.c146
1 files changed, 146 insertions, 0 deletions
diff --git a/fs/gfs2/ops_inode.c b/fs/gfs2/ops_inode.c
index 1c70fa5168d6..f8bd20baf99c 100644
--- a/fs/gfs2/ops_inode.c
+++ b/fs/gfs2/ops_inode.c
@@ -262,6 +262,44 @@ out_parent:
return error;
}
+/*
+ * gfs2_unlink_ok - check to see that a inode is still in a directory
+ * @dip: the directory
+ * @name: the name of the file
+ * @ip: the inode
+ *
+ * Assumes that the lock on (at least) @dip is held.
+ *
+ * Returns: 0 if the parent/child relationship is correct, errno if it isn't
+ */
+
+static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
+ const struct gfs2_inode *ip)
+{
+ int error;
+
+ if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
+ return -EPERM;
+
+ if ((dip->i_inode.i_mode & S_ISVTX) &&
+ dip->i_inode.i_uid != current_fsuid() &&
+ ip->i_inode.i_uid != current_fsuid() && !capable(CAP_FOWNER))
+ return -EPERM;
+
+ if (IS_APPEND(&dip->i_inode))
+ return -EPERM;
+
+ error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
+ if (error)
+ return error;
+
+ error = gfs2_dir_check(&dip->i_inode, name, ip);
+ if (error)
+ return error;
+
+ return 0;
+}
+
/**
* gfs2_unlink - Unlink a file
* @dir: The inode of the directory containing the file to unlink
@@ -473,6 +511,59 @@ static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode)
}
/**
+ * gfs2_rmdiri - Remove a directory
+ * @dip: The parent directory of the directory to be removed
+ * @name: The name of the directory to be removed
+ * @ip: The GFS2 inode of the directory to be removed
+ *
+ * Assumes Glocks on dip and ip are held
+ *
+ * Returns: errno
+ */
+
+static int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name,
+ struct gfs2_inode *ip)
+{
+ struct qstr dotname;
+ int error;
+
+ if (ip->i_entries != 2) {
+ if (gfs2_consist_inode(ip))
+ gfs2_dinode_print(ip);
+ return -EIO;
+ }
+
+ error = gfs2_dir_del(dip, name);
+ if (error)
+ return error;
+
+ error = gfs2_change_nlink(dip, -1);
+ if (error)
+ return error;
+
+ gfs2_str2qstr(&dotname, ".");
+ error = gfs2_dir_del(ip, &dotname);
+ if (error)
+ return error;
+
+ gfs2_str2qstr(&dotname, "..");
+ error = gfs2_dir_del(ip, &dotname);
+ if (error)
+ return error;
+
+ /* It looks odd, but it really should be done twice */
+ error = gfs2_change_nlink(ip, -1);
+ if (error)
+ return error;
+
+ error = gfs2_change_nlink(ip, -1);
+ if (error)
+ return error;
+
+ return error;
+}
+
+/**
* gfs2_rmdir - Remove a directory
* @dir: The parent directory of the directory to be removed
* @dentry: The dentry of the directory to remove
@@ -885,6 +976,61 @@ out:
}
/**
+ * gfs2_readlinki - return the contents of a symlink
+ * @ip: the symlink's inode
+ * @buf: a pointer to the buffer to be filled
+ * @len: a pointer to the length of @buf
+ *
+ * If @buf is too small, a piece of memory is kmalloc()ed and needs
+ * to be freed by the caller.
+ *
+ * Returns: errno
+ */
+
+static int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len)
+{
+ struct gfs2_holder i_gh;
+ struct buffer_head *dibh;
+ unsigned int x;
+ int error;
+
+ gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
+ error = gfs2_glock_nq(&i_gh);
+ if (error) {
+ gfs2_holder_uninit(&i_gh);
+ return error;
+ }
+
+ if (!ip->i_disksize) {
+ gfs2_consist_inode(ip);
+ error = -EIO;
+ goto out;
+ }
+
+ error = gfs2_meta_inode_buffer(ip, &dibh);
+ if (error)
+ goto out;
+
+ x = ip->i_disksize + 1;
+ if (x > *len) {
+ *buf = kmalloc(x, GFP_NOFS);
+ if (!*buf) {
+ error = -ENOMEM;
+ goto out_brelse;
+ }
+ }
+
+ memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x);
+ *len = x;
+
+out_brelse:
+ brelse(dibh);
+out:
+ gfs2_glock_dq_uninit(&i_gh);
+ return error;
+}
+
+/**
* gfs2_readlink - Read the value of a symlink
* @dentry: the symlink
* @buf: the buffer to read the symlink data into