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dev-type: get swap device size from blkid using FSSIZE

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blkid does not report FSBLOCKSIZE and FSLASTBLOCK for a swap device,
because it is not a proper filesystem and it only contains a header
marking such devices for use as a swap device.

However, blkid does report FSSIZE for swap devices, so use this field
instead to set the "filesystem last block" which is used subsequently
for further calculations and conditions.
This commit is contained in:
Peter Rajnoha 2024-09-19 12:39:46 +02:00
parent 86a9db05cf
commit a3f6d2f593
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GPG Key ID: E776664036DF84AB
1 changed files with 17 additions and 6 deletions
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19
lib/device/dev-type.c
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@ -913,16 +913,27 @@ int fs_get_blkid(const char *pathname, struct fs_info *fsi)
if (!blkid_probe_lookup_value(probe, "BLOCK_SIZE", &str, &len) && len) if (!blkid_probe_lookup_value(probe, "BLOCK_SIZE", &str, &len) && len)
fsi->fs_block_size_bytes = atoi(str); fsi->fs_block_size_bytes = atoi(str);
if (!blkid_probe_lookup_value(probe, "FSLASTBLOCK", &str, &len) && len)
fslastblock = strtoull(str, NULL, 0);
if (!blkid_probe_lookup_value(probe, "FSBLOCKSIZE", &str, &len) && len) if (!blkid_probe_lookup_value(probe, "FSBLOCKSIZE", &str, &len) && len)
fsblocksize = (unsigned int)atoi(str); fsblocksize = (unsigned int)atoi(str);
blkid_free_probe(probe); if (!strcmp(fsi->fstype, "swap")) {
/*
* For swap, there's no FSLASTBLOCK.
* We can use FSSIZE (size of the usable swap area) + FSBLOCKSIZE (size of the swap header)
*/
if (!blkid_probe_lookup_value(probe, "FSSIZE", &str, &len) && len)
fsi->fs_last_byte = strtoull(str, NULL, 0);
fsi->fs_last_byte += fsblocksize;
} else {
if (!blkid_probe_lookup_value(probe, "FSLASTBLOCK", &str, &len) && len)
fslastblock = strtoull(str, NULL, 0);
if (fslastblock && fsblocksize) if (fslastblock && fsblocksize)
fsi->fs_last_byte = fslastblock * fsblocksize; fsi->fs_last_byte = fslastblock * fsblocksize;
}
blkid_free_probe(probe);
log_debug("libblkid TYPE %s BLOCK_SIZE %d FSLASTBLOCK %llu FSBLOCKSIZE %u fs_last_byte %llu", log_debug("libblkid TYPE %s BLOCK_SIZE %d FSLASTBLOCK %llu FSBLOCKSIZE %u fs_last_byte %llu",
fsi->fstype, fsi->fs_block_size_bytes, (unsigned long long)fslastblock, fsblocksize, fsi->fstype, fsi->fs_block_size_bytes, (unsigned long long)fslastblock, fsblocksize,