From e009becd73b1898e67e147f2b24cad8415379b6c Mon Sep 17 00:00:00 2001 From: Peter Rajnoha Date: Thu, 19 Sep 2024 12:39:46 +0200 Subject: [PATCH] dev-type: get swap device size from blkid using FSSIZE blkid does not report FSLASTBLOCK for a swap device. However, blkid does report FSSIZE for swap devices, so use this field (and including the header size which is of FSBLOCKSIZE for the swap) instead to set the "filesystem last block" which is used subsequently for further calculations and conditions. --- lib/device/dev-type.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/lib/device/dev-type.c b/lib/device/dev-type.c index eab640168..e89ed82c8 100644 --- a/lib/device/dev-type.c +++ b/lib/device/dev-type.c @@ -943,6 +943,7 @@ int fs_get_blkid(const char *pathname, struct fs_info *fsi) const char *str = ""; size_t len = 0; uint64_t fslastblock = 0; + uint64_t fssize = 0; unsigned int fsblocksize = 0; int rc; @@ -993,10 +994,25 @@ int fs_get_blkid(const char *pathname, struct fs_info *fsi) if (!blkid_probe_lookup_value(probe, "FSBLOCKSIZE", &str, &len) && len) fsblocksize = (unsigned int)atoi(str); + if (!blkid_probe_lookup_value(probe, "FSSIZE", &str, &len) && len) + fssize = strtoull(str, NULL, 0); + blkid_free_probe(probe); if (fslastblock && fsblocksize) fsi->fs_last_byte = fslastblock * fsblocksize; + else if (fssize) { + fsi->fs_last_byte = fssize; + + /* + * For swap, there's no FSLASTBLOCK reported by blkid. We do have FSSIZE reported though. + * The last block is then calculated as: + * FSSIZE (== size of the usable swap area) + FSBLOCKSIZE (== size of the swap header) + */ + if (!strcmp(fsi->fstype, "swap")) + fsi->fs_last_byte += fsblocksize; + + } 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, -- 2.43.5