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authorArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2008-10-23 11:49:28 +0300
committerArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2008-12-03 13:14:33 +0200
commit552ff3179d1e93a3e982357544c059f3e9a5516e (patch)
treefb53c9ab1b19e1c98fc0a316859413723e34d186 /fs/ubifs/debug.c
parent17c2f9f85c896b48a5d74a9155d99ec5b241a0e6 (diff)
downloadop-kernel-dev-552ff3179d1e93a3e982357544c059f3e9a5516e.zip
op-kernel-dev-552ff3179d1e93a3e982357544c059f3e9a5516e.tar.gz
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>
Diffstat (limited to 'fs/ubifs/debug.c')
-rw-r--r--fs/ubifs/debug.c173
1 files changed, 156 insertions, 17 deletions
diff --git a/fs/ubifs/debug.c b/fs/ubifs/debug.c
index 0332a85..5684277 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 */
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