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cgpt: find: filter out more devices before touching them

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A partition's name would always start with the disk name. And in
/proc/partitions, the partitions are always listed right after the
disk.

Let's filter out devices which are not followed by partitions when
go through the /proc/partitions.

BUG=chrome-os-partner:62955
TEST=run "cgpt find -t kernel" on kevin, no more this warning:
blk_update_request: I/O error, dev mmcblk0rpmb

Change-Id: If200a2476d26b1beaf644838d47ea2e60552855e
Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
Reviewed-on: https://chromium-review.googlesource.com/444492
Reviewed-by: Julius Werner <jwerner@chromium.org>
This commit is contained in:
Jeffy Chen
2017-02-20 21:26:58 +08:00
committed by chrome-bot
parent 83bd850f3f
commit b1b5cf7ee8
1 changed files with 15 additions and 4 deletions
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19
cgpt/cgpt_find.c
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@@ -177,6 +177,7 @@ static int do_search(CgptFindParams *params, char *fileName) {
#define PROC_PARTITIONS "/proc/partitions"
#define DEV_DIR "/dev"
#define SYS_BLOCK_DIR "/sys/block"
#define MAX_PARTITION_NAME_LEN 128
static const char *devdirs[] = { "/dev", "/devices", "/devfs", 0 };
@@ -219,7 +220,8 @@ static char *is_wholedev(const char *basename) {
// returns true if any matches were found, false otherwise.
static int scan_real_devs(CgptFindParams *params) {
int found = 0;
char partname[128]; // max size for /proc/partition lines?
char partname[MAX_PARTITION_NAME_LEN];
char partname_prev[MAX_PARTITION_NAME_LEN];
FILE *fp;
char *pathname;
@@ -231,6 +233,7 @@ static int scan_real_devs(CgptFindParams *params) {
size_t line_length = 0;
char *line = NULL;
partname_prev[0] = '\0';
while (getline(&line, &line_length, fp) != -1) {
int ma, mi;
long long unsigned int sz;
@@ -238,11 +241,19 @@ static int scan_real_devs(CgptFindParams *params) {
if (sscanf(line, " %d %d %llu %127[^\n ]", &ma, &mi, &sz, partname) != 4)
continue;
if ((pathname = is_wholedev(partname))) {
if (do_search(params, pathname)) {
found++;
/* Only check devices that have partitions under them.
* We can tell by checking that an entry like "sda" is immediately
* followed by one like "sda0". */
if (!strncmp(partname_prev, partname, strlen(partname_prev)) &&
strlen(partname_prev)) {
if ((pathname = is_wholedev(partname_prev))) {
if (do_search(params, pathname)) {
found++;
}
}
}
strcpy(partname_prev, partname);
}
fclose(fp);