UBIFS: lessen the size of debugging info data structure
This patch lessens the 'struct ubifs_debug_info' size by 90 bytes by
allocating less bytes for the debugfs root directory name. It introduces macros
for the name patter an length instead of hard-coding 100 bytes. It also makes
UBIFS use 'snprintf()' and teaches it to gracefully catch situations when the
name array is too short.
Additionally, this patch makes 2 unrelated changes - I just thought they do not
deserve separate commits: simplifies 'ubifs_assert()' for non-debugging case
and makes 'dbg_debugfs_init()' properly verify debugfs return code which may be
an error code or NULL, so we should you 'IS_ERR_OR_NULL()' instead of
'IS_ERR()'.
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
diff --git a/fs/ubifs/debug.c b/fs/ubifs/debug.c
index 0bb2bce..c9609a6 100644
--- a/fs/ubifs/debug.c
+++ b/fs/ubifs/debug.c
@@ -2815,8 +2815,8 @@
int dbg_debugfs_init(void)
{
dfs_rootdir = debugfs_create_dir("ubifs", NULL);
- if (IS_ERR(dfs_rootdir)) {
- int err = PTR_ERR(dfs_rootdir);
+ if (IS_ERR_OR_NULL(dfs_rootdir)) {
+ int err = dfs_rootdir ? PTR_ERR(dfs_rootdir) : -ENODEV;
ubifs_err("cannot create \"ubifs\" debugfs directory, "
"error %d\n", err);
return err;
@@ -2880,12 +2880,20 @@
*/
int dbg_debugfs_init_fs(struct ubifs_info *c)
{
- int err;
+ int err, n;
const char *fname;
struct dentry *dent;
struct ubifs_debug_info *d = c->dbg;
- sprintf(d->dfs_dir_name, "ubi%d_%d", c->vi.ubi_num, c->vi.vol_id);
+ n = snprintf(d->dfs_dir_name, UBIFS_DFS_DIR_LEN + 1, UBIFS_DFS_DIR_NAME,
+ c->vi.ubi_num, c->vi.vol_id);
+ if (n == UBIFS_DFS_DIR_LEN) {
+ /* The array size is too small */
+ fname = UBIFS_DFS_DIR_NAME;
+ dent = ERR_PTR(-EINVAL);
+ goto out;
+ }
+
fname = d->dfs_dir_name;
dent = debugfs_create_dir(fname, dfs_rootdir);
if (IS_ERR_OR_NULL(dent))
@@ -2916,7 +2924,7 @@
debugfs_remove_recursive(d->dfs_dir);
out:
err = dent ? PTR_ERR(dent) : -ENODEV;
- ubifs_err("cannot create \"%s\" debugfs directory, error %d\n",
+ ubifs_err("cannot create \"%s\" debugfs filr or directory, error %d\n",
fname, err);
return err;
}