From e7717060ddd509e6c305ad7bf5a090a95e91c8cf Mon Sep 17 00:00:00 2001 From: Artem Bityutskiy Date: Wed, 1 Jun 2011 17:43:43 +0300 Subject: UBIFS: add global debugfs knobs Now we have per-FS (superblock) debugfs knobs, but they have one drawback - you have to first mount the FS and only after this you can switch self-checks on/off. But often we want to have the checks enabled during the mount. Introduce global debugging knobs for this purpose. Signed-off-by: Artem Bityutskiy --- fs/ubifs/debug.c | 138 +++++++++++++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 129 insertions(+), 9 deletions(-) (limited to 'fs/ubifs/debug.c') diff --git a/fs/ubifs/debug.c b/fs/ubifs/debug.c index b98638eb0fcb..15bec635bf3e 100644 --- a/fs/ubifs/debug.c +++ b/fs/ubifs/debug.c @@ -3064,7 +3064,7 @@ out_remove: debugfs_remove_recursive(d->dfs_dir); out: err = dent ? PTR_ERR(dent) : -ENODEV; - ubifs_err("cannot create \"%s\" debugfs filr or directory, error %d\n", + ubifs_err("cannot create \"%s\" debugfs file or directory, error %d\n", fname, err); return err; } @@ -3078,6 +3078,74 @@ void dbg_debugfs_exit_fs(struct ubifs_info *c) debugfs_remove_recursive(c->dbg->dfs_dir); } +struct ubifs_global_debug_info ubifs_dbg; + +static struct dentry *dfs_chk_gen; +static struct dentry *dfs_chk_index; +static struct dentry *dfs_chk_orph; +static struct dentry *dfs_chk_lprops; +static struct dentry *dfs_chk_fs; +static struct dentry *dfs_tst_rcvry; + +static ssize_t dfs_global_file_read(struct file *file, char __user *u, + size_t count, loff_t *ppos) +{ + struct dentry *dent = file->f_path.dentry; + int val; + + if (dent == dfs_chk_gen) + val = ubifs_dbg.chk_gen; + else if (dent == dfs_chk_index) + val = ubifs_dbg.chk_index; + else if (dent == dfs_chk_orph) + val = ubifs_dbg.chk_orph; + else if (dent == dfs_chk_lprops) + val = ubifs_dbg.chk_lprops; + else if (dent == dfs_chk_fs) + val = ubifs_dbg.chk_fs; + else if (dent == dfs_tst_rcvry) + val = ubifs_dbg.tst_rcvry; + else + return -EINVAL; + + return provide_user_output(val, u, count, ppos); +} + +static ssize_t dfs_global_file_write(struct file *file, const char __user *u, + size_t count, loff_t *ppos) +{ + struct dentry *dent = file->f_path.dentry; + int val; + + val = interpret_user_input(u, count); + if (val < 0) + return val; + + if (dent == dfs_chk_gen) + ubifs_dbg.chk_gen = val; + else if (dent == dfs_chk_index) + ubifs_dbg.chk_index = val; + else if (dent == dfs_chk_orph) + ubifs_dbg.chk_orph = val; + else if (dent == dfs_chk_lprops) + ubifs_dbg.chk_lprops = val; + else if (dent == dfs_chk_fs) + ubifs_dbg.chk_fs = val; + else if (dent == dfs_tst_rcvry) + ubifs_dbg.tst_rcvry = val; + else + return -EINVAL; + + return count; +} + +static const struct file_operations dfs_global_fops = { + .read = dfs_global_file_read, + .write = dfs_global_file_write, + .owner = THIS_MODULE, + .llseek = no_llseek, +}; + /** * dbg_debugfs_init - initialize debugfs file-system. * @@ -3088,15 +3156,67 @@ void dbg_debugfs_exit_fs(struct ubifs_info *c) */ int dbg_debugfs_init(void) { - dfs_rootdir = debugfs_create_dir("ubifs", NULL); - 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; - } + int err; + const char *fname; + struct dentry *dent; + + fname = "ubifs"; + dent = debugfs_create_dir(fname, NULL); + if (IS_ERR_OR_NULL(dent)) + goto out; + dfs_rootdir = dent; + + fname = "chk_general"; + dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, dfs_rootdir, NULL, + &dfs_global_fops); + if (IS_ERR_OR_NULL(dent)) + goto out_remove; + dfs_chk_gen = dent; + + fname = "chk_index"; + dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, dfs_rootdir, NULL, + &dfs_global_fops); + if (IS_ERR_OR_NULL(dent)) + goto out_remove; + dfs_chk_index = dent; + + fname = "chk_orphans"; + dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, dfs_rootdir, NULL, + &dfs_global_fops); + if (IS_ERR_OR_NULL(dent)) + goto out_remove; + dfs_chk_orph = dent; + + fname = "chk_lprops"; + dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, dfs_rootdir, NULL, + &dfs_global_fops); + if (IS_ERR_OR_NULL(dent)) + goto out_remove; + dfs_chk_lprops = dent; + + fname = "chk_fs"; + dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, dfs_rootdir, NULL, + &dfs_global_fops); + if (IS_ERR_OR_NULL(dent)) + goto out_remove; + dfs_chk_fs = dent; + + fname = "tst_recovery"; + dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, dfs_rootdir, NULL, + &dfs_global_fops); + if (IS_ERR_OR_NULL(dent)) + goto out_remove; + dfs_tst_rcvry = dent; return 0; + +out_remove: + debugfs_remove_recursive(dfs_rootdir); +out: + err = dent ? PTR_ERR(dent) : -ENODEV; + ubifs_err("cannot create \"%s\" debugfs file or directory, error %d\n", + fname, err); + return err; } /** @@ -3104,7 +3224,7 @@ int dbg_debugfs_init(void) */ void dbg_debugfs_exit(void) { - debugfs_remove(dfs_rootdir); + debugfs_remove_recursive(dfs_rootdir); } /** -- cgit v1.2.3