static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf)
{
struct super_block *sb = dentry->d_sb;
struct ext2_sb_info *sbi = EXT2_SB(sb);
struct ext2_super_block *es = sbi->s_es;
unsigned long overhead;
int i;
u64 fsid;
if (test_opt (sb, MINIX_DF))
overhead = 0;
else {
/*
* Compute the overhead (FS structures)
*/
/*
* All of the blocks before first_data_block are
* overhead
*/
overhead = le32_to_cpu(es->s_first_data_block);
/*
* Add the overhead attributed to the superblock and
* block group descriptors. If the sparse superblocks
* feature is turned on, then not all groups have this.
*/
for (i = 0; i < sbi->s_groups_count; i++)
overhead += ext2_bg_has_super(sb, i) +
ext2_bg_num_gdb(sb, i);
/*
* Every block group has an inode bitmap, a block
* bitmap, and an inode table.
*/
overhead += (sbi->s_groups_count *
(2 + sbi->s_itb_per_group));
}
buf->f_type = EXT2_SUPER_MAGIC;
buf->f_bsize = sb->s_blocksize;
buf->f_blocks = le32_to_cpu(es->s_blocks_count) - overhead;
buf->f_bfree = ext2_count_free_blocks(sb);
buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
buf->f_bavail = 0;
buf->f_files = le32_to_cpu(es->s_inodes_count);
buf->f_ffree = ext2_count_free_inodes(sb);
buf->f_namelen = EXT2_NAME_LEN;
fsid = le64_to_cpup((void *)es->s_uuid) ^
le64_to_cpup((void *)es->s_uuid + sizeof(u64));
buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
return 0;
}
int op_statfs (const char *path, struct statvfs *buf)
{
unsigned long long i;
unsigned long long s_gdb_count = 0;
unsigned long long s_groups_count = 0;
unsigned long long s_itb_per_group = 0;
unsigned long long s_overhead_last = 0;
unsigned long long s_inodes_per_block = 0;
ext2_filsys e2fs;
FUSE_EXT2_LOCK;
e2fs = current_ext2fs();
debugf("enter");
memset(buf, 0, sizeof(struct statvfs));
if (e2fs->super->s_default_mount_opts & EXT2_MOUNT_MINIX_DF) {
s_overhead_last = 0;
} else {
s_overhead_last = e2fs->super->s_first_data_block;
s_groups_count = ((EXT2_BLOCKS_COUNT(e2fs->super) - e2fs->super->s_first_data_block - 1) / e2fs->super->s_blocks_per_group) + 1;
s_gdb_count = (s_groups_count + EXT2_DESC_PER_BLOCK(e2fs->super) - 1) / EXT2_DESC_PER_BLOCK(e2fs->super);
for (i = 0; i < s_groups_count; i++) {
s_overhead_last += ext2_bg_has_super(e2fs, i) + ((ext2_bg_num_gdb(e2fs, i) == 0) ? 0 : s_gdb_count);
}
s_inodes_per_block = EXT2_BLOCK_SIZE(e2fs->super) / EXT2_INODE_SIZE(e2fs->super);
s_itb_per_group = e2fs->super->s_inodes_per_group / s_inodes_per_block;
s_overhead_last += (s_groups_count * (2 + s_itb_per_group));
}
buf->f_bsize = EXT2_BLOCK_SIZE(e2fs->super);
buf->f_frsize = /*EXT2_FRAG_SIZE(e2fs->super);*/ buf->f_bsize;
buf->f_blocks = EXT2_BLOCKS_COUNT(e2fs->super) - s_overhead_last;
buf->f_bfree = EXT2_FBLOCKS_COUNT(e2fs->super);
if (EXT2_FBLOCKS_COUNT(e2fs->super) < EXT2_RBLOCKS_COUNT(e2fs->super)) {
buf->f_bavail = 0;
} else {
buf->f_bavail = EXT2_FBLOCKS_COUNT(e2fs->super) - EXT2_RBLOCKS_COUNT(e2fs->super);
}
buf->f_files = e2fs->super->s_inodes_count;
buf->f_ffree = e2fs->super->s_free_inodes_count;
buf->f_favail = e2fs->super->s_free_inodes_count;
buf->f_namemax = EXT2_NAME_LEN;
debugf("leave");
FUSE_EXT2_UNLOCK;
return 0;
}
int ext2_statfs (struct super_block * sb, struct statfs * buf)
{
unsigned long overhead;
int i;
if (test_opt (sb, MINIX_DF))
overhead = 0;
else {
/*
* Compute the overhead (FS structures)
*/
/*
* All of the blocks before first_data_block are
* overhead
*/
overhead = le32_to_cpu(sb->u.ext2_sb.s_es->s_first_data_block);
/*
* Add the overhead attributed to the superblock and
* block group descriptors. If the sparse superblocks
* feature is turned on, then not all groups have this.
*/
for (i = 0; i < EXT2_SB(sb)->s_groups_count; i++)
overhead += ext2_bg_has_super(sb, i) +
ext2_bg_num_gdb(sb, i);
/*
* Every block group has an inode bitmap, a block
* bitmap, and an inode table.
*/
overhead += (sb->u.ext2_sb.s_groups_count *
(2 + sb->u.ext2_sb.s_itb_per_group));
}
buf->f_type = EXT2_SUPER_MAGIC;
buf->f_bsize = sb->s_blocksize;
buf->f_blocks = le32_to_cpu(sb->u.ext2_sb.s_es->s_blocks_count) - overhead;
buf->f_bfree = ext2_count_free_blocks (sb);
buf->f_bavail = buf->f_bfree - le32_to_cpu(sb->u.ext2_sb.s_es->s_r_blocks_count);
if (buf->f_bfree < le32_to_cpu(sb->u.ext2_sb.s_es->s_r_blocks_count))
buf->f_bavail = 0;
buf->f_files = le32_to_cpu(sb->u.ext2_sb.s_es->s_inodes_count);
buf->f_ffree = ext2_count_free_inodes (sb);
buf->f_namelen = EXT2_NAME_LEN;
return 0;
}
static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf)
{
struct super_block *sb = dentry->d_sb;
struct ext2_sb_info *sbi = EXT2_SB(sb);
struct ext2_super_block *es = sbi->s_es;
u64 fsid;
spin_lock(&sbi->s_lock);
if (test_opt (sb, MINIX_DF))
sbi->s_overhead_last = 0;
else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
unsigned long i, overhead = 0;
smp_rmb();
/*
* Compute the overhead (FS structures). This is constant
* for a given filesystem unless the number of block groups
* changes so we cache the previous value until it does.
*/
/*
* All of the blocks before first_data_block are
* overhead
*/
overhead = le32_to_cpu(es->s_first_data_block);
/*
* Add the overhead attributed to the superblock and
* block group descriptors. If the sparse superblocks
* feature is turned on, then not all groups have this.
*/
for (i = 0; i < sbi->s_groups_count; i++)
overhead += ext2_bg_has_super(sb, i) +
ext2_bg_num_gdb(sb, i);
/*
* Every block group has an inode bitmap, a block
* bitmap, and an inode table.
*/
overhead += (sbi->s_groups_count *
(2 + sbi->s_itb_per_group));
sbi->s_overhead_last = overhead;
smp_wmb();
sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
}
buf->f_type = EXT2_SUPER_MAGIC;
buf->f_bsize = sb->s_blocksize;
buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
buf->f_bfree = ext2_count_free_blocks(sb);
es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
buf->f_bavail = 0;
buf->f_files = le32_to_cpu(es->s_inodes_count);
buf->f_ffree = ext2_count_free_inodes(sb);
es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
buf->f_namelen = EXT2_NAME_LEN;
fsid = le64_to_cpup((void *)es->s_uuid) ^
le64_to_cpup((void *)es->s_uuid + sizeof(u64));
buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
spin_unlock(&sbi->s_lock);
return 0;
}
