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Date: Tue, 24 Feb 2015 20:24:41 -0800
From: "Darrick J. Wong" <darrick.wong@...cle.com>
To: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
Cc: linux-ext4@...r.kernel.org, "Theodore Ts'o" <tytso@....edu>
Subject: Re: [PATCH] debugfs/set_fields: fix several errors and add assertions
On Tue, Feb 24, 2015 at 03:46:11PM +0300, Konstantin Khlebnikov wrote:
> Fix copy-n-paste errors:
> * remove duplicate "lastcheck" and "min_extra_isize"
> * fix pointer for "first_error_line" and "last_error_line"
> * remove superblock field "inodes_count" from inode fields
> * add null-termination for mmp_fields
>
> Add assertions for catching such errors in the future.
> Mark true aliases with flag "FLAG_ALIAS" and suppress assert for them.
>
> Signed-off-by: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
> ---
> debugfs/set_fields.c | 65 ++++++++++++++++++++++++++++++++++++++++++--------
> 1 file changed, 55 insertions(+), 10 deletions(-)
>
> diff --git a/debugfs/set_fields.c b/debugfs/set_fields.c
> index 60695ad..1af7d0f 100644
> --- a/debugfs/set_fields.c
> +++ b/debugfs/set_fields.c
> @@ -30,6 +30,7 @@
> #ifdef HAVE_ERRNO_H
> #include <errno.h>
> #endif
> +#include <assert.h>
> #if HAVE_STRINGS_H
> #include <strings.h>
> #endif
> @@ -50,6 +51,7 @@ static ext2_ino_t set_ino;
> static int array_idx;
>
> #define FLAG_ARRAY 0x0001
> +#define FLAG_ALIAS 0x0002 /* Data intersects with other field */
>
> struct field_set_info {
> const char *name;
> @@ -110,7 +112,6 @@ static struct field_set_info super_fields[] = {
> { "uuid", &set_sb.s_uuid, NULL, 16, parse_uuid },
> { "volume_name", &set_sb.s_volume_name, NULL, 16, parse_string },
> { "last_mounted", &set_sb.s_last_mounted, NULL, 64, parse_string },
> - { "lastcheck", &set_sb.s_lastcheck, NULL, 4, parse_uint },
> { "algorithm_usage_bitmap", &set_sb.s_algorithm_usage_bitmap, NULL,
> 4, parse_uint },
> { "prealloc_blocks", &set_sb.s_prealloc_blocks, NULL, 1, parse_uint },
> @@ -135,7 +136,6 @@ static struct field_set_info super_fields[] = {
> { "want_extra_isize", &set_sb.s_want_extra_isize, NULL, 2, parse_uint },
> { "flags", &set_sb.s_flags, NULL, 4, parse_uint },
> { "raid_stride", &set_sb.s_raid_stride, NULL, 2, parse_uint },
> - { "min_extra_isize", &set_sb.s_min_extra_isize, NULL, 4, parse_uint },
> { "mmp_interval", &set_sb.s_mmp_update_interval, NULL, 2, parse_uint },
> { "mmp_block", &set_sb.s_mmp_block, NULL, 8, parse_uint },
> { "raid_stripe_width", &set_sb.s_raid_stripe_width, NULL, 4, parse_uint },
> @@ -159,19 +159,18 @@ static struct field_set_info super_fields[] = {
> { "first_error_ino", &set_sb.s_first_error_ino, NULL, 4, parse_uint },
> { "first_error_block", &set_sb.s_first_error_block, NULL, 8, parse_uint },
> { "first_error_func", &set_sb.s_first_error_func, NULL, 32, parse_string },
> - { "first_error_line", &set_sb.s_first_error_ino, NULL, 4, parse_uint },
> + { "first_error_line", &set_sb.s_first_error_line, NULL, 4, parse_uint },
> { "last_error_time", &set_sb.s_last_error_time, NULL, 4, parse_time },
> { "last_error_ino", &set_sb.s_last_error_ino, NULL, 4, parse_uint },
> { "last_error_block", &set_sb.s_last_error_block, NULL, 8, parse_uint },
> { "last_error_func", &set_sb.s_last_error_func, NULL, 32, parse_string },
> - { "last_error_line", &set_sb.s_last_error_ino, NULL, 4, parse_uint },
> + { "last_error_line", &set_sb.s_last_error_line, NULL, 4, parse_uint },
> { "encrypt_algos", &set_sb.s_encrypt_algos, NULL, 1, parse_uint,
> FLAG_ARRAY, 4 },
> { 0, 0, 0, 0 }
> };
>
> static struct field_set_info inode_fields[] = {
> - { "inodes_count", &set_sb.s_inodes_count, NULL, 4, parse_uint },
> { "mode", &set_inode.i_mode, NULL, 2, parse_uint },
> { "uid", &set_inode.i_uid, &set_inode.osd2.linux2.l_i_uid_high,
> 2, parse_uint },
> @@ -189,7 +188,8 @@ static struct field_set_info inode_fields[] = {
> { "flags", &set_inode.i_flags, NULL, 4, parse_uint },
> { "version", &set_inode.osd1.linux1.l_i_version,
> &set_inode.i_version_hi, 4, parse_uint },
> - { "translator", &set_inode.osd1.hurd1.h_i_translator, NULL, 4, parse_uint },
> + { "translator", &set_inode.osd1.hurd1.h_i_translator, NULL,
> + 4, parse_uint, FLAG_ALIAS },
> { "block", &set_inode.i_block[0], NULL, 4, parse_uint, FLAG_ARRAY,
> EXT2_NDIR_BLOCKS },
> { "block[IND]", &set_inode.i_block[EXT2_IND_BLOCK], NULL, 4, parse_uint },
> @@ -199,14 +199,14 @@ static struct field_set_info inode_fields[] = {
> /* Special case: i_file_acl_high is 2 bytes */
> { "file_acl", &set_inode.i_file_acl,
> &set_inode.osd2.linux2.l_i_file_acl_high, 6, parse_uint },
> - { "dir_acl", &set_inode.i_dir_acl, NULL, 4, parse_uint },
> + { "dir_acl", &set_inode.i_dir_acl, NULL, 4, parse_uint, FLAG_ALIAS },
> { "faddr", &set_inode.i_faddr, NULL, 4, parse_uint },
> - { "frag", &set_inode.osd2.hurd2.h_i_frag, NULL, 1, parse_uint },
> + { "frag", &set_inode.osd2.hurd2.h_i_frag, NULL, 1, parse_uint, FLAG_ALIAS },
> { "fsize", &set_inode.osd2.hurd2.h_i_fsize, NULL, 1, parse_uint },
> { "checksum", &set_inode.osd2.linux2.l_i_checksum_lo,
> &set_inode.i_checksum_hi, 2, parse_uint },
> { "author", &set_inode.osd2.hurd2.h_i_author, NULL,
> - 4, parse_uint },
> + 4, parse_uint, FLAG_ALIAS },
> { "extra_isize", &set_inode.i_extra_isize, NULL,
> 2, parse_uint },
> { "ctime_extra", &set_inode.i_ctime_extra, NULL,
> @@ -262,7 +262,8 @@ static struct field_set_info ext4_bg_fields[] = {
> };
>
> static struct field_set_info mmp_fields[] = {
> - { "clear", &set_mmp.mmp_magic, NULL, sizeof(set_mmp), parse_mmp_clear },
> + { "clear", &set_mmp.mmp_magic, NULL, sizeof(set_mmp),
> + parse_mmp_clear, FLAG_ALIAS },
> { "magic", &set_mmp.mmp_magic, NULL, 4, parse_uint },
> { "seq", &set_mmp.mmp_seq, NULL, 4, parse_uint },
> { "time", &set_mmp.mmp_time, NULL, 8, parse_uint },
> @@ -272,8 +273,52 @@ static struct field_set_info mmp_fields[] = {
> parse_string },
> { "check_interval", &set_mmp.mmp_check_interval, NULL, 2, parse_uint },
> { "checksum", &set_mmp.mmp_checksum, NULL, 4, parse_uint },
> + { 0, 0, 0, 0 }
Looks good so far.
> };
>
> +static void do_verify_field_set_info(struct field_set_info *fields,
> + const void *data, size_t size)
> +{
> + struct field_set_info *ss, *ss2;
> + const char *begin = (char *)data;
> + const char *end = begin + size;
> +
> + for (ss = fields ; ss->name ; ss++) {
> + const char *ptr;
> +
> + /* Check pointers */
> + ptr = ss->ptr;
> + assert(!ptr || (ptr >= begin && ptr < end));
> + ptr = ss->ptr2;
> + assert(!ptr || (ptr >= begin && ptr < end));
> +
> + /* Check function */
> + assert(ss->func);
> +
> + for (ss2 = fields ; ss2 != ss ; ss2++) {
> + /* Check duplicate names */
> + assert(strcmp(ss->name, ss2->name));
> +
> + if (ss->flags & FLAG_ALIAS || ss2->flags & FLAG_ALIAS)
> + continue;
> + /* Check false aliases, might be copy-n-paste error */
> + assert(!ss->ptr || (ss->ptr != ss2->ptr &&
> + ss->ptr != ss2->ptr2));
> + assert(!ss->ptr2 || (ss->ptr2 != ss2->ptr &&
> + ss->ptr2 != ss2->ptr2));
> + }
> + }
> +}
> +
> +static __attribute__((constructor)) void verify_field_set_info(void)
> +{
> + do_verify_field_set_info(super_fields, &set_sb, sizeof(set_sb));
> + do_verify_field_set_info(inode_fields, &set_inode, sizeof(set_inode));
> + do_verify_field_set_info(ext2_bg_fields, &set_gd, sizeof(set_gd));
> + do_verify_field_set_info(ext4_bg_fields, &set_gd4, sizeof(set_gd4));
> + do_verify_field_set_info(mmp_fields, &set_mmp, sizeof(set_mmp));
> +}
This ought to be run along with the 'make check' testcases, since they're
already looking for errors there.
Also, does running this on /every/ debugfs invocation slow down startup
noticeably? Just idle curiosity. :)
--D
> +
> static int check_suffix(const char *field)
> {
> int len = strlen(field);
>
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