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authorArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2011-05-19 14:13:16 +0300
committerArtem Bityutskiy <dedekind1@gmail.com>2011-07-04 10:54:26 +0300
commitae380ce04731579f45f27b3a84d7d8d8ee1f9b1b (patch)
treef887f69b40899eb6bc5a61554da9485100ed2f89 /fs/ubifs
parent549c999a768a7a144c60a0faa58f34c48f39112b (diff)
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>
Diffstat (limited to 'fs/ubifs')
-rw-r--r--fs/ubifs/debug.c18
-rw-r--r--fs/ubifs/debug.h11
2 files changed, 22 insertions, 7 deletions
diff --git a/fs/ubifs/debug.c b/fs/ubifs/debug.c
index 0bb2bcef0de..c9609a63512 100644
--- a/fs/ubifs/debug.c
+++ b/fs/ubifs/debug.c
@@ -2815,8 +2815,8 @@ static struct dentry *dfs_rootdir;
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 @@ static const struct file_operations dfs_fops = {
*/
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 @@ out_remove:
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;
}
diff --git a/fs/ubifs/debug.h b/fs/ubifs/debug.h
index a811ac4a26b..b59c43a4149 100644
--- a/fs/ubifs/debug.h
+++ b/fs/ubifs/debug.h
@@ -33,6 +33,13 @@ typedef int (*dbg_znode_callback)(struct ubifs_info *c,
#include <linux/random.h>
+/*
+ * The UBIFS debugfs directory name pattern and maximum name length (3 for "ubi"
+ * + 1 for "_" and plus 2x2 for 2 UBI numbers and 1 for the trailing zero byte.
+ */
+#define UBIFS_DFS_DIR_NAME "ubi%d_%d"
+#define UBIFS_DFS_DIR_LEN (3 + 1 + 2*2 + 1)
+
/**
* ubifs_debug_info - per-FS debugging information.
* @old_zroot: old index root - used by 'dbg_check_old_index()'
@@ -84,7 +91,7 @@ struct ubifs_debug_info {
long long saved_free;
int saved_idx_gc_cnt;
- char dfs_dir_name[100];
+ char dfs_dir_name[UBIFS_DFS_DIR_LEN + 1];
struct dentry *dfs_dir;
struct dentry *dfs_dump_lprops;
struct dentry *dfs_dump_budg;
@@ -313,7 +320,7 @@ void dbg_debugfs_exit_fs(struct ubifs_info *c);
/* Use "if (0)" to make compiler check arguments even if debugging is off */
#define ubifs_assert(expr) do { \
- if (0 && (expr)) \
+ if (0) \
printk(KERN_CRIT "UBIFS assert failed in %s at %u (pid %d)\n", \
__func__, __LINE__, current->pid); \
} while (0)