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Avoid to use gcc extensions when allocating the fiemap
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This commit is contained in:
Andrea Mazzoleni 2026-02-28 09:37:19 +01:00
parent ffbbc71bd4
commit ba18fdaf07
1 changed files with 14 additions and 12 deletions
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26
cmdline/unix.c
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@ -768,10 +768,8 @@ int filephy(const char* path, uint64_t size, uint64_t* physical)
/* In Linux get the real physical address of the file */
/* Note that FIEMAP doesn't require root permission */
int f;
struct {
struct fiemap fiemap;
struct fiemap_extent extent;
} fm;
struct fiemap* fiemap;
size_t fiemap_size;
unsigned int blknum;
f = open(path, O_RDONLY);
@ -781,15 +779,17 @@ int filephy(const char* path, uint64_t size, uint64_t* physical)
/* first try with FIEMAP */
/* if works for ext2, ext3, ext4, xfs, btrfs */
memset(&fm, 0, sizeof(fm));
fm.fiemap.fm_start = 0;
fm.fiemap.fm_length = ~0ULL;
fm.fiemap.fm_flags = FIEMAP_FLAG_SYNC; /* required to ensure that just created files report a valid address and not 0 */
fm.fiemap.fm_extent_count = 1; /* we are interested only at the first block */
fiemap_size = sizeof(struct fiemap) + sizeof(struct fiemap_extent);
fiemap = malloc_nofail(fiemap_size);
memset(fiemap, 0, fiemap_size);
fiemap->fm_start = 0;
fiemap->fm_length = ~0ULL;
fiemap->fm_flags = FIEMAP_FLAG_SYNC; /* required to ensure that just created files report a valid address and not 0 */
fiemap->fm_extent_count = 1; /* we are interested only at the first block */
if (ioctl(f, FS_IOC_FIEMAP, &fm) != -1) {
uint32_t flags = fm.fiemap.fm_extents[0].fe_flags;
uint64_t offset = fm.fiemap.fm_extents[0].fe_physical;
if (ioctl(f, FS_IOC_FIEMAP, fiemap) != -1) {
uint32_t flags = fiemap->fm_extents[0].fe_flags;
uint64_t offset = fiemap->fm_extents[0].fe_physical;
/* check some condition for validating the offset */
if (flags & FIEMAP_EXTENT_DATA_INLINE) {
@ -812,6 +812,8 @@ int filephy(const char* path, uint64_t size, uint64_t* physical)
return 0;
}
free(fiemap);
/* if the file is empty, FIBMAP doesn't work, and we don't even try to use it */
if (size == 0) {
*physical = FILEPHY_WITHOUT_OFFSET;