UBIFS: add debugfs support

We need to have a possibility to see various UBIFS variables
and ask UBIFS to dump various information. Debugfs is what
we need.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

1 files changed, 156 insertions, 17 deletions

diff --git a/fs/ubifs/debug.c b/fs/ubifs/debug.c
index 0332a856a082..56842772c804 100644
--- a/fs/ubifs/debug.c
+++ b/fs/ubifs/debug.c
@@ -32,6 +32,7 @@
 #include "ubifs.h"
 #include <linux/module.h>
 #include <linux/moduleparam.h>
+#include <linux/debugfs.h>
 
 #ifdef CONFIG_UBIFS_FS_DEBUG
 
@@ -988,22 +989,20 @@ static int dbg_check_key_order(struct ubifs_info *c, struct ubifs_zbranch *zbr1,
         err = 1;
         key_read(c, &dent1->key, &key);
         if (keys_cmp(c, &zbr1->key, &key)) {
-                dbg_err("1st entry at %d:%d has key %s", zbr1->lnum,
-                        zbr1->offs, DBGKEY(&key));
-                dbg_err("but it should have key %s according to tnc",
-                        DBGKEY(&zbr1->key));
-                        dbg_dump_node(c, dent1);
-                        goto out_free;
+                ubifs_err("1st entry at %d:%d has key %s", zbr1->lnum,
+                          zbr1->offs, DBGKEY(&key));
+                ubifs_err("but it should have key %s according to tnc",
+                          DBGKEY(&zbr1->key)); dbg_dump_node(c, dent1);
+                goto out_free;
         }
 
         key_read(c, &dent2->key, &key);
         if (keys_cmp(c, &zbr2->key, &key)) {
-                dbg_err("2nd entry at %d:%d has key %s", zbr1->lnum,
-                        zbr1->offs, DBGKEY(&key));
-                dbg_err("but it should have key %s according to tnc",
-                        DBGKEY(&zbr2->key));
-                        dbg_dump_node(c, dent2);
-                        goto out_free;
+                ubifs_err("2nd entry at %d:%d has key %s", zbr1->lnum,
+                          zbr1->offs, DBGKEY(&key));
+                ubifs_err("but it should have key %s according to tnc",
+                          DBGKEY(&zbr2->key)); dbg_dump_node(c, dent2);
+                goto out_free;
         }
 
         nlen1 = le16_to_cpu(dent1->nlen);
@@ -1015,14 +1014,14 @@ static int dbg_check_key_order(struct ubifs_info *c, struct ubifs_zbranch *zbr1,
                 goto out_free;
         }
         if (cmp == 0 && nlen1 == nlen2)
-                dbg_err("2 xent/dent nodes with the same name");
+                ubifs_err("2 xent/dent nodes with the same name");
         else
-                dbg_err("bad order of colliding key %s",
+                ubifs_err("bad order of colliding key %s",
                         DBGKEY(&key));
 
-        dbg_msg("first node at %d:%d\n", zbr1->lnum, zbr1->offs);
+        ubifs_msg("first node at %d:%d\n", zbr1->lnum, zbr1->offs);
         dbg_dump_node(c, dent1);
-        dbg_msg("second node at %d:%d\n", zbr2->lnum, zbr2->offs);
+        ubifs_msg("second node at %d:%d\n", zbr2->lnum, zbr2->offs);
         dbg_dump_node(c, dent2);
 
 out_free:
@@ -2103,7 +2102,7 @@ static void failure_mode_init(struct ubifs_info *c)
 
         fmi = kmalloc(sizeof(struct failure_mode_info), GFP_NOFS);
         if (!fmi) {
-                dbg_err("Failed to register failure mode - no memory");
+                ubifs_err("Failed to register failure mode - no memory");
                 return;
         }
         fmi->c = c;
@@ -2383,4 +2382,144 @@ void ubifs_debugging_exit(struct ubifs_info *c)
         kfree(c->dbg);
 }
 
+/*
+ * Root directory for UBIFS stuff in debugfs. Contains sub-directories which
+ * contain the stuff specific to particular file-system mounts.
+ */
+static struct dentry *debugfs_rootdir;
+
+/**
+ * dbg_debugfs_init - initialize debugfs file-system.
+ *
+ * UBIFS uses debugfs file-system to expose various debugging knobs to
+ * user-space. This function creates "ubifs" directory in the debugfs
+ * file-system. Returns zero in case of success and a negative error code in
+ * case of failure.
+ */
+int dbg_debugfs_init(void)
+{
+        debugfs_rootdir = debugfs_create_dir("ubifs", NULL);
+        if (IS_ERR(debugfs_rootdir)) {
+                int err = PTR_ERR(debugfs_rootdir);
+                ubifs_err("cannot create \"ubifs\" debugfs directory, "
+                          "error %d\n", err);
+                return err;
+        }
+
+        return 0;
+}
+
+/**
+ * dbg_debugfs_exit - remove the "ubifs" directory from debugfs file-system.
+ */
+void dbg_debugfs_exit(void)
+{
+        debugfs_remove(debugfs_rootdir);
+}
+
+static int open_debugfs_file(struct inode *inode, struct file *file)
+{
+        file->private_data = inode->i_private;
+        return 0;
+}
+
+static ssize_t write_debugfs_file(struct file *file, const char __user *buf,
+                                  size_t count, loff_t *ppos)
+{
+        struct ubifs_info *c = file->private_data;
+        struct ubifs_debug_info *d = c->dbg;
+
+        if (file->f_path.dentry == d->dump_lprops)
+                dbg_dump_lprops(c);
+        else if (file->f_path.dentry == d->dump_budg) {
+                spin_lock(&c->space_lock);
+                dbg_dump_budg(c);
+                spin_unlock(&c->space_lock);
+        } else if (file->f_path.dentry == d->dump_budg) {
+                mutex_lock(&c->tnc_mutex);
+                dbg_dump_tnc(c);
+                mutex_unlock(&c->tnc_mutex);
+        } else
+                return -EINVAL;
+
+        *ppos += count;
+        return count;
+}
+
+static const struct file_operations debugfs_fops = {
+        .open = open_debugfs_file,
+        .write = write_debugfs_file,
+        .owner = THIS_MODULE,
+};
+
+/**
+ * dbg_debugfs_init_fs - initialize debugfs for UBIFS instance.
+ * @c: UBIFS file-system description object
+ *
+ * This function creates all debugfs files for this instance of UBIFS. Returns
+ * zero in case of success and a negative error code in case of failure.
+ *
+ * Note, the only reason we have not merged this function with the
+ * 'ubifs_debugging_init()' function is because it is better to initialize
+ * debugfs interfaces at the very end of the mount process, and remove them at
+ * the very beginning of the mount process.
+ */
+int dbg_debugfs_init_fs(struct ubifs_info *c)
+{
+        int err;
+        const char *fname;
+        struct dentry *dent;
+        struct ubifs_debug_info *d = c->dbg;
+
+        sprintf(d->debugfs_dir_name, "ubi%d_%d", c->vi.ubi_num, c->vi.vol_id);
+        d->debugfs_dir = debugfs_create_dir(d->debugfs_dir_name,
+                                              debugfs_rootdir);
+        if (IS_ERR(d->debugfs_dir)) {
+                err = PTR_ERR(d->debugfs_dir);
+                ubifs_err("cannot create \"%s\" debugfs directory, error %d\n",
+                          d->debugfs_dir_name, err);
+                goto out;
+        }
+
+        fname = "dump_lprops";
+        dent = debugfs_create_file(fname, S_IWUGO, d->debugfs_dir, c,
+                                   &debugfs_fops);
+        if (IS_ERR(dent))
+                goto out_remove;
+        d->dump_lprops = dent;
+
+        fname = "dump_budg";
+        dent = debugfs_create_file(fname, S_IWUGO, d->debugfs_dir, c,
+                                   &debugfs_fops);
+        if (IS_ERR(dent))
+                goto out_remove;
+        d->dump_budg = dent;
+
+        fname = "dump_tnc";
+        dent = debugfs_create_file(fname, S_IWUGO, d->debugfs_dir, c,
+                                   &debugfs_fops);
+        if (IS_ERR(dent))
+                goto out_remove;
+        d->dump_tnc = dent;
+
+        return 0;
+
+out_remove:
+        err = PTR_ERR(dent);
+        ubifs_err("cannot create \"%s\" debugfs directory, error %d\n",
+                  fname, err);
+        debugfs_remove_recursive(d->debugfs_dir);
+out:
+        return err;
+}
+
+/**
+ * dbg_debugfs_exit_fs - remove all debugfs files.
+ * @c: UBIFS file-system description object
+ */
+void dbg_debugfs_exit_fs(struct ubifs_info *c)
+{
+        debugfs_remove_recursive(c->dbg->debugfs_dir);
+}
+
 #endif /* CONFIG_UBIFS_FS_DEBUG */