From 702d6a834b497a7c387722bd796e0dc18bb55360 Mon Sep 17 00:00:00 2001 From: Greg Kroah-Hartman Date: Wed, 12 Jun 2019 17:21:20 +0200 Subject: ubifs: no need to check return value of debugfs_create functions When calling debugfs functions, there is no need to ever check the return value. The function can work or not, but the code logic should never do something different based on this. Cc: Richard Weinberger Cc: Artem Bityutskiy Cc: Adrian Hunter Cc: linux-mtd@lists.infradead.org Signed-off-by: Greg Kroah-Hartman Link: https://lore.kernel.org/r/20190612152120.GA17450@kroah.com Signed-off-by: Greg Kroah-Hartman --- fs/ubifs/debug.c | 167 ++++++++++++++----------------------------------------- fs/ubifs/debug.h | 4 +- fs/ubifs/super.c | 9 +-- 3 files changed, 45 insertions(+), 135 deletions(-) (limited to 'fs/ubifs') diff --git a/fs/ubifs/debug.c b/fs/ubifs/debug.c index 3a2613038e88..57e6fcb043ca 100644 --- a/fs/ubifs/debug.c +++ b/fs/ubifs/debug.c @@ -2812,115 +2812,69 @@ static const struct file_operations dfs_fops = { * 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. + * This function creates all debugfs files for this instance of UBIFS. * * 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) +void dbg_debugfs_init_fs(struct ubifs_info *c) { int err, n; const char *fname; - struct dentry *dent; struct ubifs_debug_info *d = c->dbg; - if (!IS_ENABLED(CONFIG_DEBUG_FS)) - return 0; - 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; + return; } fname = d->dfs_dir_name; - dent = debugfs_create_dir(fname, dfs_rootdir); - if (IS_ERR_OR_NULL(dent)) - goto out; - d->dfs_dir = dent; + d->dfs_dir = debugfs_create_dir(fname, dfs_rootdir); fname = "dump_lprops"; - dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, c, &dfs_fops); - if (IS_ERR_OR_NULL(dent)) - goto out_remove; - d->dfs_dump_lprops = dent; + d->dfs_dump_lprops = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, c, + &dfs_fops); fname = "dump_budg"; - dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, c, &dfs_fops); - if (IS_ERR_OR_NULL(dent)) - goto out_remove; - d->dfs_dump_budg = dent; + d->dfs_dump_budg = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, c, + &dfs_fops); fname = "dump_tnc"; - dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, c, &dfs_fops); - if (IS_ERR_OR_NULL(dent)) - goto out_remove; - d->dfs_dump_tnc = dent; + d->dfs_dump_tnc = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, c, + &dfs_fops); fname = "chk_general"; - dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, d->dfs_dir, c, - &dfs_fops); - if (IS_ERR_OR_NULL(dent)) - goto out_remove; - d->dfs_chk_gen = dent; + d->dfs_chk_gen = debugfs_create_file(fname, S_IRUSR | S_IWUSR, + d->dfs_dir, c, &dfs_fops); fname = "chk_index"; - dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, d->dfs_dir, c, - &dfs_fops); - if (IS_ERR_OR_NULL(dent)) - goto out_remove; - d->dfs_chk_index = dent; + d->dfs_chk_index = debugfs_create_file(fname, S_IRUSR | S_IWUSR, + d->dfs_dir, c, &dfs_fops); fname = "chk_orphans"; - dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, d->dfs_dir, c, - &dfs_fops); - if (IS_ERR_OR_NULL(dent)) - goto out_remove; - d->dfs_chk_orph = dent; + d->dfs_chk_orph = debugfs_create_file(fname, S_IRUSR | S_IWUSR, + d->dfs_dir, c, &dfs_fops); fname = "chk_lprops"; - dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, d->dfs_dir, c, - &dfs_fops); - if (IS_ERR_OR_NULL(dent)) - goto out_remove; - d->dfs_chk_lprops = dent; + d->dfs_chk_lprops = debugfs_create_file(fname, S_IRUSR | S_IWUSR, + d->dfs_dir, c, &dfs_fops); fname = "chk_fs"; - dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, d->dfs_dir, c, - &dfs_fops); - if (IS_ERR_OR_NULL(dent)) - goto out_remove; - d->dfs_chk_fs = dent; + d->dfs_chk_fs = debugfs_create_file(fname, S_IRUSR | S_IWUSR, + d->dfs_dir, c, &dfs_fops); fname = "tst_recovery"; - dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, d->dfs_dir, c, - &dfs_fops); - if (IS_ERR_OR_NULL(dent)) - goto out_remove; - d->dfs_tst_rcvry = dent; + d->dfs_tst_rcvry = debugfs_create_file(fname, S_IRUSR | S_IWUSR, + d->dfs_dir, c, &dfs_fops); fname = "ro_error"; - dent = debugfs_create_file(fname, S_IRUSR | S_IWUSR, d->dfs_dir, c, - &dfs_fops); - if (IS_ERR_OR_NULL(dent)) - goto out_remove; - d->dfs_ro_error = dent; - - return 0; - -out_remove: - debugfs_remove_recursive(d->dfs_dir); -out: - err = dent ? PTR_ERR(dent) : -ENODEV; - ubifs_err(c, "cannot create \"%s\" debugfs file or directory, error %d\n", - fname, err); - return err; + d->dfs_ro_error = debugfs_create_file(fname, S_IRUSR | S_IWUSR, + d->dfs_dir, c, &dfs_fops); } /** @@ -2929,8 +2883,7 @@ out: */ void dbg_debugfs_exit_fs(struct ubifs_info *c) { - if (IS_ENABLED(CONFIG_DEBUG_FS)) - debugfs_remove_recursive(c->dbg->dfs_dir); + debugfs_remove_recursive(c->dbg->dfs_dir); } struct ubifs_global_debug_info ubifs_dbg; @@ -3006,75 +2959,38 @@ static const struct file_operations dfs_global_fops = { * * 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. + * file-system. */ -int dbg_debugfs_init(void) +void dbg_debugfs_init(void) { - int err; const char *fname; - struct dentry *dent; - - if (!IS_ENABLED(CONFIG_DEBUG_FS)) - return 0; fname = "ubifs"; - dent = debugfs_create_dir(fname, NULL); - if (IS_ERR_OR_NULL(dent)) - goto out; - dfs_rootdir = dent; + dfs_rootdir = debugfs_create_dir(fname, NULL); 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; + dfs_chk_gen = debugfs_create_file(fname, S_IRUSR | S_IWUSR, dfs_rootdir, + NULL, &dfs_global_fops); 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; + dfs_chk_index = debugfs_create_file(fname, S_IRUSR | S_IWUSR, + dfs_rootdir, NULL, &dfs_global_fops); 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; + dfs_chk_orph = debugfs_create_file(fname, S_IRUSR | S_IWUSR, + dfs_rootdir, NULL, &dfs_global_fops); 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; + dfs_chk_lprops = debugfs_create_file(fname, S_IRUSR | S_IWUSR, + dfs_rootdir, NULL, &dfs_global_fops); 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; + dfs_chk_fs = debugfs_create_file(fname, S_IRUSR | S_IWUSR, dfs_rootdir, + NULL, &dfs_global_fops); 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; - pr_err("UBIFS error (pid %d): cannot create \"%s\" debugfs file or directory, error %d\n", - current->pid, fname, err); - return err; + dfs_tst_rcvry = debugfs_create_file(fname, S_IRUSR | S_IWUSR, + dfs_rootdir, NULL, &dfs_global_fops); } /** @@ -3082,8 +2998,7 @@ out: */ void dbg_debugfs_exit(void) { - if (IS_ENABLED(CONFIG_DEBUG_FS)) - debugfs_remove_recursive(dfs_rootdir); + debugfs_remove_recursive(dfs_rootdir); } void ubifs_assert_failed(struct ubifs_info *c, const char *expr, diff --git a/fs/ubifs/debug.h b/fs/ubifs/debug.h index 64c6977c189b..c6c8f1b62af5 100644 --- a/fs/ubifs/debug.h +++ b/fs/ubifs/debug.h @@ -309,9 +309,9 @@ int dbg_leb_unmap(struct ubifs_info *c, int lnum); int dbg_leb_map(struct ubifs_info *c, int lnum); /* Debugfs-related stuff */ -int dbg_debugfs_init(void); +void dbg_debugfs_init(void); void dbg_debugfs_exit(void); -int dbg_debugfs_init_fs(struct ubifs_info *c); +void dbg_debugfs_init_fs(struct ubifs_info *c); void dbg_debugfs_exit_fs(struct ubifs_info *c); #endif /* !__UBIFS_DEBUG_H__ */ diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c index 04b8ecfd3470..2429906bd681 100644 --- a/fs/ubifs/super.c +++ b/fs/ubifs/super.c @@ -1477,9 +1477,7 @@ static int mount_ubifs(struct ubifs_info *c) if (err) goto out_infos; - err = dbg_debugfs_init_fs(c); - if (err) - goto out_infos; + dbg_debugfs_init_fs(c); c->mounting = 0; @@ -2364,9 +2362,7 @@ static int __init ubifs_init(void) if (err) goto out_shrinker; - err = dbg_debugfs_init(); - if (err) - goto out_compr; + dbg_debugfs_init(); err = register_filesystem(&ubifs_fs_type); if (err) { @@ -2378,7 +2374,6 @@ static int __init ubifs_init(void) out_dbg: dbg_debugfs_exit(); -out_compr: ubifs_compressors_exit(); out_shrinker: unregister_shrinker(&ubifs_shrinker_info); -- cgit v1.2.3 From d71cac5971192049a3a375a2e68b63f4092bd6a1 Mon Sep 17 00:00:00 2001 From: Greg Kroah-Hartman Date: Thu, 4 Jul 2019 08:32:10 +0200 Subject: ubifs: fix build warning after debugfs cleanup patch Stephen writes: After merging the driver-core tree, today's linux-next build (arm multi_v7_defconfig) produced this warning: fs/ubifs/debug.c: In function 'dbg_debugfs_init_fs': fs/ubifs/debug.c:2812:6: warning: unused variable 'err' [-Wunused-variable] int err, n; ^~~ So fix this up properly. Reported-by: Stephen Rothwell Cc: Richard Weinberger Cc: Artem Bityutskiy Cc: Adrian Hunter Cc: linux-mtd@lists.infradead.org Signed-off-by: Greg Kroah-Hartman --- fs/ubifs/debug.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'fs/ubifs') diff --git a/fs/ubifs/debug.c b/fs/ubifs/debug.c index 57e6fcb043ca..baae6eceabac 100644 --- a/fs/ubifs/debug.c +++ b/fs/ubifs/debug.c @@ -2821,7 +2821,7 @@ static const struct file_operations dfs_fops = { */ void dbg_debugfs_init_fs(struct ubifs_info *c) { - int err, n; + int n; const char *fname; struct ubifs_debug_info *d = c->dbg; -- cgit v1.2.3