ref: 733c5d6645b133b60d304c38fcb1398f94d0618c
dir: /sys/src/cmd/ext4srv/ext4_inode.c/
#include "ext4_config.h"
#include "ext4_types.h"
#include "ext4_misc.h"
#include "ext4_debug.h"
#include "ext4_inode.h"
#include "ext4_super.h"
/**@brief Compute number of bits for block count.
* @param block_size Filesystem block_size
* @return Number of bits
*/
static u32int ext4_inode_block_bits_count(u32int block_size)
{
u32int bits = 8;
u32int size = block_size;
do {
bits++;
size = size >> 1;
} while (size > 256);
return bits;
}
u32int ext4_inode_get_mode(struct ext4_sblock *sb, struct ext4_inode *inode)
{
u32int v = to_le16(inode->mode);
if (ext4_get32(sb, creator_os) == EXT4_SUPERBLOCK_OS_HURD) {
v |= ((u32int)to_le16(inode->osd2.hurd2.mode_high)) << 16;
}
return v;
}
void ext4_inode_set_mode(struct ext4_sblock *sb, struct ext4_inode *inode,
u32int mode)
{
inode->mode = to_le16((mode << 16) >> 16);
if (ext4_get32(sb, creator_os) == EXT4_SUPERBLOCK_OS_HURD)
inode->osd2.hurd2.mode_high = to_le16(mode >> 16);
}
u32int ext4_inode_get_uid(struct ext4_inode *inode)
{
return to_le32(inode->uid);
}
void ext4_inode_set_uid(struct ext4_inode *inode, u32int uid)
{
inode->uid = to_le32(uid);
}
u64int ext4_inode_get_size(struct ext4_sblock *sb, struct ext4_inode *inode)
{
u64int v = to_le32(inode->size_lo);
if ((ext4_get32(sb, rev_level) > 0) &&
(ext4_inode_is_type(sb, inode, EXT4_INODE_MODE_FILE)))
v |= ((u64int)to_le32(inode->size_hi)) << 32;
return v;
}
void ext4_inode_set_size(struct ext4_inode *inode, u64int size)
{
inode->size_lo = to_le32((size << 32) >> 32);
inode->size_hi = to_le32(size >> 32);
}
u32int ext4_inode_get_csum(struct ext4_sblock *sb, struct ext4_inode *inode)
{
u16int inode_size = ext4_get16(sb, inode_size);
u32int v = to_le16(inode->osd2.linux2.checksum_lo);
if (inode_size > EXT4_GOOD_OLD_INODE_SIZE)
v |= ((u32int)to_le16(inode->checksum_hi)) << 16;
return v;
}
void ext4_inode_set_csum(struct ext4_sblock *sb, struct ext4_inode *inode,
u32int checksum)
{
u16int inode_size = ext4_get16(sb, inode_size);
inode->osd2.linux2.checksum_lo =
to_le16((checksum << 16) >> 16);
if (inode_size > EXT4_GOOD_OLD_INODE_SIZE)
inode->checksum_hi = to_le16(checksum >> 16);
}
u32int ext4_inode_get_access_time(struct ext4_inode *inode)
{
return to_le32(inode->access_time);
}
void ext4_inode_set_access_time(struct ext4_inode *inode, u32int time)
{
inode->access_time = to_le32(time);
}
u32int ext4_inode_get_change_inode_time(struct ext4_inode *inode)
{
return to_le32(inode->change_inode_time);
}
void ext4_inode_set_change_inode_time(struct ext4_inode *inode, u32int time)
{
inode->change_inode_time = to_le32(time);
}
u32int ext4_inode_get_modif_time(struct ext4_inode *inode)
{
return to_le32(inode->modification_time);
}
void ext4_inode_set_modif_time(struct ext4_inode *inode, u32int time)
{
inode->modification_time = to_le32(time);
}
u32int ext4_inode_get_del_time(struct ext4_inode *inode)
{
return to_le32(inode->deletion_time);
}
void ext4_inode_set_del_time(struct ext4_inode *inode, u32int time)
{
inode->deletion_time = to_le32(time);
}
u32int ext4_inode_get_creation_time(struct ext4_inode *inode)
{
return to_le32(inode->crtime);
}
u32int ext4_inode_get_gid(struct ext4_inode *inode)
{
return to_le32(inode->gid);
}
void ext4_inode_set_gid(struct ext4_inode *inode, u32int gid)
{
inode->gid = to_le32(gid);
}
u16int ext4_inode_get_links_cnt(struct ext4_inode *inode)
{
return to_le16(inode->links_count);
}
void ext4_inode_set_links_cnt(struct ext4_inode *inode, u16int cnt)
{
inode->links_count = to_le16(cnt);
}
u64int ext4_inode_get_blocks_count(struct ext4_sblock *sb,
struct ext4_inode *inode)
{
u64int cnt = to_le32(inode->blocks_count_lo);
if (ext4_sb_feature_ro_com(sb, EXT4_FRO_COM_HUGE_FILE)) {
/* 48-bit field */
cnt |= (u64int)to_le16(inode->osd2.linux2.blocks_high) << 32;
if (ext4_inode_has_flag(inode, EXT4_INODE_FLAG_HUGE_FILE)) {
u32int block_count = ext4_sb_get_block_size(sb);
u32int b = ext4_inode_block_bits_count(block_count);
return cnt << (b - 9);
}
}
return cnt;
}
int ext4_inode_set_blocks_count(struct ext4_sblock *sb,
struct ext4_inode *inode, u64int count)
{
/* 32-bit maximum */
u64int max = 0;
max = ~max >> 32;
if (count <= max) {
inode->blocks_count_lo = to_le32((u32int)count);
inode->osd2.linux2.blocks_high = 0;
ext4_inode_clear_flag(inode, EXT4_INODE_FLAG_HUGE_FILE);
return 0;
}
/* Check if there can be used huge files (many blocks) */
if (!ext4_sb_feature_ro_com(sb, EXT4_FRO_COM_HUGE_FILE)) {
werrstr(Einval);
return -1;
}
/* 48-bit maximum */
max = 0;
max = ~max >> 16;
if (count <= max) {
inode->blocks_count_lo = to_le32((u32int)count);
inode->osd2.linux2.blocks_high = to_le16((u16int)(count >> 32));
ext4_inode_clear_flag(inode, EXT4_INODE_FLAG_HUGE_FILE);
} else {
u32int block_count = ext4_sb_get_block_size(sb);
u32int block_bits =ext4_inode_block_bits_count(block_count);
ext4_inode_set_flag(inode, EXT4_INODE_FLAG_HUGE_FILE);
count = count >> (block_bits - 9);
inode->blocks_count_lo = to_le32((u32int)count);
inode->osd2.linux2.blocks_high = to_le16((u16int)(count >> 32));
}
return 0;
}
u32int ext4_inode_get_flags(struct ext4_inode *inode)
{
return to_le32(inode->flags);
}
void ext4_inode_set_flags(struct ext4_inode *inode, u32int flags)
{
inode->flags = to_le32(flags);
}
u32int ext4_inode_get_generation(struct ext4_inode *inode)
{
return to_le32(inode->generation);
}
void ext4_inode_set_generation(struct ext4_inode *inode, u32int gen)
{
inode->generation = to_le32(gen);
}
u16int ext4_inode_get_extra_isize(struct ext4_sblock *sb,
struct ext4_inode *inode)
{
u16int inode_size = ext4_get16(sb, inode_size);
if (inode_size > EXT4_GOOD_OLD_INODE_SIZE)
return to_le16(inode->extra_isize);
else
return 0;
}
void ext4_inode_set_extra_isize(struct ext4_sblock *sb,
struct ext4_inode *inode,
u16int size)
{
u16int inode_size = ext4_get16(sb, inode_size);
if (inode_size > EXT4_GOOD_OLD_INODE_SIZE)
inode->extra_isize = to_le16(size);
}
u64int ext4_inode_get_file_acl(struct ext4_inode *inode,
struct ext4_sblock *sb)
{
u64int v = to_le32(inode->file_acl_lo);
if (ext4_get32(sb, creator_os) == EXT4_SUPERBLOCK_OS_LINUX)
v |= (u32int)to_le16(inode->osd2.linux2.file_acl_high) << 16;
return v;
}
void ext4_inode_set_file_acl(struct ext4_inode *inode, struct ext4_sblock *sb,
u64int acl)
{
inode->file_acl_lo = to_le32((acl << 32) >> 32);
if (ext4_get32(sb, creator_os) == EXT4_SUPERBLOCK_OS_LINUX)
inode->osd2.linux2.file_acl_high = to_le16((u16int)(acl >> 32));
}
u32int ext4_inode_get_direct_block(struct ext4_inode *inode, u32int idx)
{
return to_le32(inode->blocks[idx]);
}
void ext4_inode_set_direct_block(struct ext4_inode *inode, u32int idx,
u32int block)
{
inode->blocks[idx] = to_le32(block);
}
u32int ext4_inode_get_indirect_block(struct ext4_inode *inode, u32int idx)
{
return to_le32(inode->blocks[idx + EXT4_INODE_INDIRECT_BLOCK]);
}
void ext4_inode_set_indirect_block(struct ext4_inode *inode, u32int idx,
u32int block)
{
inode->blocks[idx + EXT4_INODE_INDIRECT_BLOCK] = to_le32(block);
}
u32int ext4_inode_get_dev(struct ext4_inode *inode)
{
u32int dev_0, dev_1;
dev_0 = ext4_inode_get_direct_block(inode, 0);
dev_1 = ext4_inode_get_direct_block(inode, 1);
if (dev_0)
return dev_0;
else
return dev_1;
}
void ext4_inode_set_dev(struct ext4_inode *inode, u32int dev)
{
if (dev & ~0xFFFF)
ext4_inode_set_direct_block(inode, 1, dev);
else
ext4_inode_set_direct_block(inode, 0, dev);
}
u32int ext4_inode_type(struct ext4_sblock *sb, struct ext4_inode *inode)
{
return (ext4_inode_get_mode(sb, inode) & EXT4_INODE_MODE_TYPE_MASK);
}
bool ext4_inode_is_type(struct ext4_sblock *sb, struct ext4_inode *inode,
u32int type)
{
return ext4_inode_type(sb, inode) == type;
}
bool ext4_inode_has_flag(struct ext4_inode *inode, u32int f)
{
return ext4_inode_get_flags(inode) & f;
}
void ext4_inode_clear_flag(struct ext4_inode *inode, u32int f)
{
u32int flags = ext4_inode_get_flags(inode);
flags = flags & (~f);
ext4_inode_set_flags(inode, flags);
}
void ext4_inode_set_flag(struct ext4_inode *inode, u32int f)
{
u32int flags = ext4_inode_get_flags(inode);
flags = flags | f;
ext4_inode_set_flags(inode, flags);
}
bool ext4_inode_can_truncate(struct ext4_sblock *sb, struct ext4_inode *inode)
{
if ((ext4_inode_has_flag(inode, EXT4_INODE_FLAG_APPEND)) ||
(ext4_inode_has_flag(inode, EXT4_INODE_FLAG_IMMUTABLE)))
return false;
if ((ext4_inode_is_type(sb, inode, EXT4_INODE_MODE_FILE)) ||
(ext4_inode_is_type(sb, inode, EXT4_INODE_MODE_DIRECTORY)) ||
(ext4_inode_is_type(sb, inode, EXT4_INODE_MODE_SOFTLINK)))
return true;
return false;
}
struct ext4_extent_header *
ext4_inode_get_extent_header(struct ext4_inode *inode)
{
return (struct ext4_extent_header *)inode->blocks;
}