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Add FS_IOC_GETFSLABEL ioctl support for reading filesystem labels in Linux

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This commit is contained in:
Andrea Mazzoleni 2026-08-10 11:58:39 +02:00
parent 97b13557fe
commit 413e46251e
1 changed files with 75 additions and 3 deletions
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78
cmdline/unixapp.c
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@ -1385,6 +1385,73 @@ static int devuuid_label(uint64_t device, char* label, size_t label_size)
}
#endif
/**
* Get the LABEL using the generic Linux FS_IOC_GETFSLABEL ioctl.
*/
#if HAVE_LINUX_DEVICE
#ifndef FSLABEL_MAX
#define FSLABEL_MAX 256
#endif
#ifndef FS_IOC_GETFSLABEL
#define FS_IOC_GETFSLABEL _IOR(0x94, 49, char[FSLABEL_MAX])
#endif
static int devlabel_ioctl(const char* path, char* label, size_t label_size)
{
char label_buf[FSLABEL_MAX];
int fd = open(path, O_RDONLY | O_DIRECTORY | O_CLOEXEC);
if (fd < 0 && (errno == ENOENT || errno == ENOTDIR)) {
char dir[PATH_MAX];
char* slash;
if (strlen(path) + 1 > sizeof(dir)) {
/* LCOV_EXCL_START */
return -1;
/* LCOV_EXCL_STOP */
}
strcpy(dir, path);
slash = strrchr(dir, '/');
if (slash) {
*slash = 0;
fd = open(dir, O_RDONLY | O_DIRECTORY | O_CLOEXEC);
}
}
if (fd < 0) {
/* LCOV_EXCL_START */
log_tag("label:ioctl: open(%s) failed, %s\n", path, strerror(errno));
return -1;
/* LCOV_EXCL_STOP */
}
memset(label_buf, 0, sizeof(label_buf));
if (ioctl(fd, FS_IOC_GETFSLABEL, label_buf) < 0) {
log_tag("label:ioctl: FS_IOC_GETFSLABEL(%s) failed, %s\n", path, strerror(errno));
close(fd);
return -1;
}
close(fd);
if (label_buf[0] == 0) {
log_tag("label:ioctl:%s: empty label\n", path);
return -1;
}
if (strlen(label_buf) + 1 > label_size) {
/* LCOV_EXCL_START */
return -1;
/* LCOV_EXCL_STOP */
}
strcpy(label, label_buf);
log_tag("label:ioctl:%s: found %s\n", path, label);
return 0;
}
#endif
#ifdef __APPLE__
static int devuuid_darwin(const char* path, char* uuid, size_t uuid_size)
@ -1963,10 +2030,15 @@ int fsinfo(const char* path, int* has_persistent_inode, int* has_syncronized_har
if (fslabel) {
fslabel[0] = 0;
#if HAVE_LINUX_DEVICE
if (devlabel_ioctl(path, fslabel, fslabel_size) != 0)
#endif
#if HAVE_BLKID
struct stat fst;
if (stat(path, &fst) == 0)
devuuid_label(fst.st_dev, fslabel, fslabel_size);
{
struct stat fst;
if (stat(path, &fst) == 0)
devuuid_label(fst.st_dev, fslabel, fslabel_size);
}
#else
(void)fslabel_size;
#endif