Create a small file and fallocate it to a big size with FALLOC_FL_KEEP_SIZE option, then truncate it back to the small size again, the disk free space is not changed back in this case. i.e, total 4 -rw-r--r-- 1 root root 512 Jun 28 11:35 test Filesystem Size Used Avail Use% Mounted on .... /dev/sdb1 8.0G 56K 7.2G 1% /mnt -rw-r--r-- 1 root root 512 Jun 28 11:35 /mnt/test Filesystem Size Used Avail Use% Mounted on .... /dev/sdb1 8.0G 5.1G 2.2G 70% /mnt Filesystem Size Used Avail Use% Mounted on .... /dev/sdb1 8.0G 5.1G 2.2G 70% /mnt With this fix, the truncated up space is back as: Filesystem Size Used Avail Use% Mounted on .... /dev/sdb1 8.0G 56K 7.2G 1% /mnt
Unified · Split
| @@ -4391,9 +4391,6 @@ static int btrfs_setsize(struct inode *inode, struct iattr *attr) · 4390 unmodified lines | ||
| 4391 | 4391 | int mask = attr->ia_valid; |
| 4392 | 4392 | int ret; |
| 4393 | 4393 | |
| 4394 | − if (newsize == oldsize) | |
| 4395 | − return 0; | |
| 4396 | − | |
| 4397 | 4394 | /* |
| 4398 | 4395 | * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a |
| 4399 | 4396 | * special case where we need to update the times despite not having |