shaba/lvm2
1
0
Fork 0
mirror of git://sourceware.org/git/lvm2.git synced 2024-12-21 13:34:40 +03:00
Code Releases Activity

dev-type: use fopen for sysfs file

Browse Source 
Directly open sysfs files and save extra stat() call which
is not adding any extra safety in sysfs dir.
This commit is contained in:
Zdenek Kabelac 2021-02-07 14:07:17 +01:00
parent e429e69b65
commit 3bf2ca11d9
1 changed files with 6 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
lib/device/dev-type.c
View File

@ -944,8 +944,7 @@ static unsigned long _dev_topology_attribute(struct dev_types *dt,
const char *sysfs_dir = dm_sysfs_dir();
char path[PATH_MAX], buffer[64];
FILE *fp;
struct stat info;
dev_t uninitialized_var(primary);
dev_t primary = 0;
unsigned long result = default_value;
unsigned long value = 0UL;
@ -963,9 +962,9 @@ static unsigned long _dev_topology_attribute(struct dev_types *dt,
* - if not: either the kernel doesn't have topology support
* or the device could be a partition
*/
if (stat(path, &info) == -1) {
if (!(fp = fopen(path, "r"))) {
if (errno != ENOENT) {
log_sys_debug("stat", path);
log_sys_debug("fopen", path);
goto out;
}
if (!dev_get_primary_dev(dt, dev, &primary))
@ -975,17 +974,12 @@ static unsigned long _dev_topology_attribute(struct dev_types *dt,
if (!_snprintf_attr(path, sizeof(path), sysfs_dir, attribute, primary))
goto_out;
if (stat(path, &info) == -1) {
if (errno != ENOENT)
log_sys_debug("stat", path);
goto out;
}
}
if (!(fp = fopen(path, "r"))) {
if (errno != ENOENT)
log_sys_debug("fopen", path);
goto out;
}
}
if (!fgets(buffer, sizeof(buffer), fp)) {
log_sys_debug("fgets", path);
@ -993,7 +987,7 @@ static unsigned long _dev_topology_attribute(struct dev_types *dt,
}
if (sscanf(buffer, "%lu", &value) != 1) {
log_warn("sysfs file %s not in expected format: %s", path, buffer);
log_warn("WARNING: sysfs file %s not in expected format: %s", path, buffer);
goto out_close;
}