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#include "btrfs.h"
#include "common/io.h"
#include <fcntl.h>
enum { uuidLen = (uint32_t) __builtin_strlen("00000000-0000-0000-0000-000000000000") };
static const char* enumerateDevices(FFBtrfsResult* item, int dfd, FFstrbuf* buffer) {
int subfd = openat(dfd, "devices", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
if (subfd < 0) {
return "openat(\"/sys/fs/btrfs/UUID/devices\") == -1";
}
FF_AUTO_CLOSE_DIR DIR* dirp = fdopendir(subfd);
if (dirp == NULL) {
close(subfd);
return "fdopendir(\"/sys/fs/btrfs/UUID/devices\") == NULL";
}
struct dirent* entry;
while ((entry = readdir(dirp)) != NULL) {
if (entry->d_name[0] == '.') {
continue;
}
if (item->devices.length) {
ffStrbufAppendC(&item->devices, ',');
}
ffStrbufAppendS(&item->devices, entry->d_name);
char path[sizeof(entry->d_name) + sizeof("/size") + 1];
snprintf(path, ARRAY_SIZE(path), "%s/size", entry->d_name);
if (ffReadFileBufferRelative(subfd, path, buffer)) {
item->totalSize += ffStrbufToUInt(buffer, 0) * 512;
}
}
return NULL;
}
static const char* enumerateFeatures(FFBtrfsResult* item, int dfd) {
int subfd = openat(dfd, "features", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
if (subfd < 0) {
return "openat(\"/sys/fs/btrfs/UUID/features\") == -1";
}
FF_AUTO_CLOSE_DIR DIR* dirp = fdopendir(subfd);
if (dirp == NULL) {
return "fdopendir(\"/sys/fs/btrfs/UUID/features\") == NULL";
}
struct dirent* entry;
while ((entry = readdir(dirp)) != NULL) {
if (entry->d_name[0] == '.') {
continue;
}
if (item->features.length) {
ffStrbufAppendC(&item->features, ',');
}
ffStrbufAppendS(&item->features, entry->d_name);
}
return NULL;
}
static const char* detectAllocation(FFBtrfsResult* item, int dfd, FFstrbuf* buffer) {
FF_AUTO_CLOSE_FD int subfd = openat(dfd, "allocation", O_RDONLY | O_CLOEXEC | O_PATH | O_DIRECTORY);
if (subfd < 0) {
return "openat(\"/sys/fs/btrfs/UUID/allocation\") == -1";
}
if (ffReadFileBufferRelative(subfd, "global_rsv_size", buffer)) {
item->globalReservationTotal = ffStrbufToUInt(buffer, 0);
} else {
return "ffReadFileBuffer(\"/sys/fs/btrfs/UUID/allocation/global_rsv_size\") == NULL";
}
if (ffReadFileBufferRelative(subfd, "global_rsv_reserved", buffer)) {
item->globalReservationUsed = ffStrbufToUInt(buffer, 0);
}
item->globalReservationUsed = item->globalReservationTotal - item->globalReservationUsed;
#define FF_BTRFS_DETECT_PROFILE(_index, _type, _profile, _copies) \
else if (faccessat(subfd, _type "/" _profile "/", F_OK, 0) == 0) { \
item->allocation[_index].profile = _profile; \
item->allocation[_index].copies = _copies; \
}
#define FF_BTRFS_DETECT_TYPE(_index, _type) \
do { \
item->allocation[_index].type = _type; \
if (ffReadFileBufferRelative(subfd, _type "/total_bytes", buffer)) \
item->allocation[_index].total = ffStrbufToUInt(buffer, 0); \
\
if (ffReadFileBufferRelative(subfd, _type "/bytes_used", buffer)) \
item->allocation[_index].used = ffStrbufToUInt(buffer, 0); \
\
if (false) {} \
FF_BTRFS_DETECT_PROFILE(_index, _type, "single", 1) \
FF_BTRFS_DETECT_PROFILE(_index, _type, "dup", 2) \
FF_BTRFS_DETECT_PROFILE(_index, _type, "raid0", 1) \
FF_BTRFS_DETECT_PROFILE(_index, _type, "raid1", 2) \
FF_BTRFS_DETECT_PROFILE(_index, _type, "raid10", 2) \
FF_BTRFS_DETECT_PROFILE(_index, _type, "raid1c3", 3) \
FF_BTRFS_DETECT_PROFILE(_index, _type, "raid1c4", 4) \
FF_BTRFS_DETECT_PROFILE(_index, _type, "raid5", 1) /* (n-1)/n */ \
FF_BTRFS_DETECT_PROFILE(_index, _type, "raid6", 1) /* (n-2)/n */ \
else { \
item->allocation[_index].profile = "unknown"; \
item->allocation[_index].copies = 1; \
} \
} while (0)
FF_BTRFS_DETECT_TYPE(0, "data");
FF_BTRFS_DETECT_TYPE(1, "metadata");
FF_BTRFS_DETECT_TYPE(2, "system");
#undef FF_BTRFS_DETECT_TYPE
return NULL;
}
const char* ffDetectBtrfs(FFlist* result) {
FF_AUTO_CLOSE_DIR DIR* dirp = opendir("/sys/fs/btrfs/");
if (dirp == NULL) {
return "opendir(\"/sys/fs/btrfs\") == NULL";
}
FF_STRBUF_AUTO_DESTROY buffer = ffStrbufCreate();
struct dirent* entry;
while ((entry = readdir(dirp)) != NULL) {
if (entry->d_name[0] == '.') {
continue;
}
if (strlen(entry->d_name) != uuidLen) {
continue;
}
FFBtrfsResult* item = FF_LIST_ADD(FFBtrfsResult, *result);
(*item) = (FFBtrfsResult) {
.uuid = ffStrbufCreateNS(uuidLen, entry->d_name),
.name = ffStrbufCreate(),
.devices = ffStrbufCreate(),
.features = ffStrbufCreate(),
};
FF_AUTO_CLOSE_FD int dfd = openat(dirfd(dirp), entry->d_name, O_RDONLY | O_CLOEXEC | O_PATH | O_DIRECTORY);
if (dfd < 0) {
continue;
}
if (ffAppendFileBufferRelative(dfd, "label", &item->name)) {
ffStrbufTrimRightSpace(&item->name);
}
enumerateDevices(item, dfd, &buffer);
enumerateFeatures(item, dfd);
if (ffReadFileBufferRelative(dfd, "generation", &buffer)) {
item->generation = (uint32_t) ffStrbufToUInt(&buffer, 0);
}
if (ffReadFileBufferRelative(dfd, "nodesize", &buffer)) {
item->nodeSize = (uint32_t) ffStrbufToUInt(&buffer, 0);
}
if (ffReadFileBufferRelative(dfd, "sectorsize", &buffer)) {
item->sectorSize = (uint32_t) ffStrbufToUInt(&buffer, 0);
}
detectAllocation(item, dfd, &buffer);
}
return NULL;
}
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