315 lines
8.8 KiB
C
315 lines
8.8 KiB
C
/*
|
|
* linux/fs/hpfs/inode.c
|
|
*
|
|
* Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
|
|
*
|
|
* inode VFS functions
|
|
*/
|
|
|
|
#include <linux/slab.h>
|
|
#include <linux/user_namespace.h>
|
|
#include "hpfs_fn.h"
|
|
|
|
void hpfs_init_inode(struct inode *i)
|
|
{
|
|
struct super_block *sb = i->i_sb;
|
|
struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
|
|
|
|
i->i_uid = hpfs_sb(sb)->sb_uid;
|
|
i->i_gid = hpfs_sb(sb)->sb_gid;
|
|
i->i_mode = hpfs_sb(sb)->sb_mode;
|
|
i->i_size = -1;
|
|
i->i_blocks = -1;
|
|
|
|
hpfs_inode->i_dno = 0;
|
|
hpfs_inode->i_n_secs = 0;
|
|
hpfs_inode->i_file_sec = 0;
|
|
hpfs_inode->i_disk_sec = 0;
|
|
hpfs_inode->i_dpos = 0;
|
|
hpfs_inode->i_dsubdno = 0;
|
|
hpfs_inode->i_ea_mode = 0;
|
|
hpfs_inode->i_ea_uid = 0;
|
|
hpfs_inode->i_ea_gid = 0;
|
|
hpfs_inode->i_ea_size = 0;
|
|
|
|
hpfs_inode->i_rddir_off = NULL;
|
|
hpfs_inode->i_dirty = 0;
|
|
|
|
i->i_ctime.tv_sec = i->i_ctime.tv_nsec = 0;
|
|
i->i_mtime.tv_sec = i->i_mtime.tv_nsec = 0;
|
|
i->i_atime.tv_sec = i->i_atime.tv_nsec = 0;
|
|
}
|
|
|
|
void hpfs_read_inode(struct inode *i)
|
|
{
|
|
struct buffer_head *bh;
|
|
struct fnode *fnode;
|
|
struct super_block *sb = i->i_sb;
|
|
struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
|
|
void *ea;
|
|
int ea_size;
|
|
|
|
if (!(fnode = hpfs_map_fnode(sb, i->i_ino, &bh))) {
|
|
/*i->i_mode |= S_IFREG;
|
|
i->i_mode &= ~0111;
|
|
i->i_op = &hpfs_file_iops;
|
|
i->i_fop = &hpfs_file_ops;
|
|
clear_nlink(i);*/
|
|
make_bad_inode(i);
|
|
return;
|
|
}
|
|
if (hpfs_sb(i->i_sb)->sb_eas) {
|
|
if ((ea = hpfs_get_ea(i->i_sb, fnode, "UID", &ea_size))) {
|
|
if (ea_size == 2) {
|
|
i_uid_write(i, le16_to_cpu(*(__le16*)ea));
|
|
hpfs_inode->i_ea_uid = 1;
|
|
}
|
|
kfree(ea);
|
|
}
|
|
if ((ea = hpfs_get_ea(i->i_sb, fnode, "GID", &ea_size))) {
|
|
if (ea_size == 2) {
|
|
i_gid_write(i, le16_to_cpu(*(__le16*)ea));
|
|
hpfs_inode->i_ea_gid = 1;
|
|
}
|
|
kfree(ea);
|
|
}
|
|
if ((ea = hpfs_get_ea(i->i_sb, fnode, "SYMLINK", &ea_size))) {
|
|
kfree(ea);
|
|
i->i_mode = S_IFLNK | 0777;
|
|
i->i_op = &page_symlink_inode_operations;
|
|
i->i_data.a_ops = &hpfs_symlink_aops;
|
|
set_nlink(i, 1);
|
|
i->i_size = ea_size;
|
|
i->i_blocks = 1;
|
|
brelse(bh);
|
|
return;
|
|
}
|
|
if ((ea = hpfs_get_ea(i->i_sb, fnode, "MODE", &ea_size))) {
|
|
int rdev = 0;
|
|
umode_t mode = hpfs_sb(sb)->sb_mode;
|
|
if (ea_size == 2) {
|
|
mode = le16_to_cpu(*(__le16*)ea);
|
|
hpfs_inode->i_ea_mode = 1;
|
|
}
|
|
kfree(ea);
|
|
i->i_mode = mode;
|
|
if (S_ISBLK(mode) || S_ISCHR(mode)) {
|
|
if ((ea = hpfs_get_ea(i->i_sb, fnode, "DEV", &ea_size))) {
|
|
if (ea_size == 4)
|
|
rdev = le32_to_cpu(*(__le32*)ea);
|
|
kfree(ea);
|
|
}
|
|
}
|
|
if (S_ISBLK(mode) || S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
|
|
brelse(bh);
|
|
set_nlink(i, 1);
|
|
i->i_size = 0;
|
|
i->i_blocks = 1;
|
|
init_special_inode(i, mode,
|
|
new_decode_dev(rdev));
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
if (fnode_is_dir(fnode)) {
|
|
int n_dnodes, n_subdirs;
|
|
i->i_mode |= S_IFDIR;
|
|
i->i_op = &hpfs_dir_iops;
|
|
i->i_fop = &hpfs_dir_ops;
|
|
hpfs_inode->i_parent_dir = le32_to_cpu(fnode->up);
|
|
hpfs_inode->i_dno = le32_to_cpu(fnode->u.external[0].disk_secno);
|
|
if (hpfs_sb(sb)->sb_chk >= 2) {
|
|
struct buffer_head *bh0;
|
|
if (hpfs_map_fnode(sb, hpfs_inode->i_parent_dir, &bh0)) brelse(bh0);
|
|
}
|
|
n_dnodes = 0; n_subdirs = 0;
|
|
hpfs_count_dnodes(i->i_sb, hpfs_inode->i_dno, &n_dnodes, &n_subdirs, NULL);
|
|
i->i_blocks = 4 * n_dnodes;
|
|
i->i_size = 2048 * n_dnodes;
|
|
set_nlink(i, 2 + n_subdirs);
|
|
} else {
|
|
i->i_mode |= S_IFREG;
|
|
if (!hpfs_inode->i_ea_mode) i->i_mode &= ~0111;
|
|
i->i_op = &hpfs_file_iops;
|
|
i->i_fop = &hpfs_file_ops;
|
|
set_nlink(i, 1);
|
|
i->i_size = le32_to_cpu(fnode->file_size);
|
|
i->i_blocks = ((i->i_size + 511) >> 9) + 1;
|
|
i->i_data.a_ops = &hpfs_aops;
|
|
hpfs_i(i)->mmu_private = i->i_size;
|
|
}
|
|
brelse(bh);
|
|
}
|
|
|
|
static void hpfs_write_inode_ea(struct inode *i, struct fnode *fnode)
|
|
{
|
|
struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
|
|
/*if (le32_to_cpu(fnode->acl_size_l) || le16_to_cpu(fnode->acl_size_s)) {
|
|
Some unknown structures like ACL may be in fnode,
|
|
we'd better not overwrite them
|
|
hpfs_error(i->i_sb, "fnode %08x has some unknown HPFS386 structures", i->i_ino);
|
|
} else*/ if (hpfs_sb(i->i_sb)->sb_eas >= 2) {
|
|
__le32 ea;
|
|
if (!uid_eq(i->i_uid, hpfs_sb(i->i_sb)->sb_uid) || hpfs_inode->i_ea_uid) {
|
|
ea = cpu_to_le32(i_uid_read(i));
|
|
hpfs_set_ea(i, fnode, "UID", (char*)&ea, 2);
|
|
hpfs_inode->i_ea_uid = 1;
|
|
}
|
|
if (!gid_eq(i->i_gid, hpfs_sb(i->i_sb)->sb_gid) || hpfs_inode->i_ea_gid) {
|
|
ea = cpu_to_le32(i_gid_read(i));
|
|
hpfs_set_ea(i, fnode, "GID", (char *)&ea, 2);
|
|
hpfs_inode->i_ea_gid = 1;
|
|
}
|
|
if (!S_ISLNK(i->i_mode))
|
|
if ((i->i_mode != ((hpfs_sb(i->i_sb)->sb_mode & ~(S_ISDIR(i->i_mode) ? 0 : 0111))
|
|
| (S_ISDIR(i->i_mode) ? S_IFDIR : S_IFREG))
|
|
&& i->i_mode != ((hpfs_sb(i->i_sb)->sb_mode & ~(S_ISDIR(i->i_mode) ? 0222 : 0333))
|
|
| (S_ISDIR(i->i_mode) ? S_IFDIR : S_IFREG))) || hpfs_inode->i_ea_mode) {
|
|
ea = cpu_to_le32(i->i_mode);
|
|
/* sick, but legal */
|
|
hpfs_set_ea(i, fnode, "MODE", (char *)&ea, 2);
|
|
hpfs_inode->i_ea_mode = 1;
|
|
}
|
|
if (S_ISBLK(i->i_mode) || S_ISCHR(i->i_mode)) {
|
|
ea = cpu_to_le32(new_encode_dev(i->i_rdev));
|
|
hpfs_set_ea(i, fnode, "DEV", (char *)&ea, 4);
|
|
}
|
|
}
|
|
}
|
|
|
|
void hpfs_write_inode(struct inode *i)
|
|
{
|
|
struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
|
|
struct inode *parent;
|
|
if (i->i_ino == hpfs_sb(i->i_sb)->sb_root) return;
|
|
if (hpfs_inode->i_rddir_off && !atomic_read(&i->i_count)) {
|
|
if (*hpfs_inode->i_rddir_off) printk("HPFS: write_inode: some position still there\n");
|
|
kfree(hpfs_inode->i_rddir_off);
|
|
hpfs_inode->i_rddir_off = NULL;
|
|
}
|
|
if (!i->i_nlink) {
|
|
return;
|
|
}
|
|
parent = iget_locked(i->i_sb, hpfs_inode->i_parent_dir);
|
|
if (parent) {
|
|
hpfs_inode->i_dirty = 0;
|
|
if (parent->i_state & I_NEW) {
|
|
hpfs_init_inode(parent);
|
|
hpfs_read_inode(parent);
|
|
unlock_new_inode(parent);
|
|
}
|
|
hpfs_write_inode_nolock(i);
|
|
iput(parent);
|
|
}
|
|
}
|
|
|
|
void hpfs_write_inode_nolock(struct inode *i)
|
|
{
|
|
struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
|
|
struct buffer_head *bh;
|
|
struct fnode *fnode;
|
|
struct quad_buffer_head qbh;
|
|
struct hpfs_dirent *de;
|
|
if (i->i_ino == hpfs_sb(i->i_sb)->sb_root) return;
|
|
if (!(fnode = hpfs_map_fnode(i->i_sb, i->i_ino, &bh))) return;
|
|
if (i->i_ino != hpfs_sb(i->i_sb)->sb_root && i->i_nlink) {
|
|
if (!(de = map_fnode_dirent(i->i_sb, i->i_ino, fnode, &qbh))) {
|
|
brelse(bh);
|
|
return;
|
|
}
|
|
} else de = NULL;
|
|
if (S_ISREG(i->i_mode)) {
|
|
fnode->file_size = cpu_to_le32(i->i_size);
|
|
if (de) de->file_size = cpu_to_le32(i->i_size);
|
|
} else if (S_ISDIR(i->i_mode)) {
|
|
fnode->file_size = cpu_to_le32(0);
|
|
if (de) de->file_size = cpu_to_le32(0);
|
|
}
|
|
hpfs_write_inode_ea(i, fnode);
|
|
if (de) {
|
|
de->write_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_mtime.tv_sec));
|
|
de->read_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_atime.tv_sec));
|
|
de->creation_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_ctime.tv_sec));
|
|
de->read_only = !(i->i_mode & 0222);
|
|
de->ea_size = cpu_to_le32(hpfs_inode->i_ea_size);
|
|
hpfs_mark_4buffers_dirty(&qbh);
|
|
hpfs_brelse4(&qbh);
|
|
}
|
|
if (S_ISDIR(i->i_mode)) {
|
|
if ((de = map_dirent(i, hpfs_inode->i_dno, "\001\001", 2, NULL, &qbh))) {
|
|
de->write_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_mtime.tv_sec));
|
|
de->read_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_atime.tv_sec));
|
|
de->creation_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_ctime.tv_sec));
|
|
de->read_only = !(i->i_mode & 0222);
|
|
de->ea_size = cpu_to_le32(/*hpfs_inode->i_ea_size*/0);
|
|
de->file_size = cpu_to_le32(0);
|
|
hpfs_mark_4buffers_dirty(&qbh);
|
|
hpfs_brelse4(&qbh);
|
|
} else
|
|
hpfs_error(i->i_sb,
|
|
"directory %08lx doesn't have '.' entry",
|
|
(unsigned long)i->i_ino);
|
|
}
|
|
mark_buffer_dirty(bh);
|
|
brelse(bh);
|
|
}
|
|
|
|
int hpfs_setattr(struct dentry *dentry, struct iattr *attr)
|
|
{
|
|
struct inode *inode = dentry->d_inode;
|
|
int error = -EINVAL;
|
|
|
|
hpfs_lock(inode->i_sb);
|
|
if (inode->i_ino == hpfs_sb(inode->i_sb)->sb_root)
|
|
goto out_unlock;
|
|
if ((attr->ia_valid & ATTR_UID) &&
|
|
from_kuid(&init_user_ns, attr->ia_uid) >= 0x10000)
|
|
goto out_unlock;
|
|
if ((attr->ia_valid & ATTR_GID) &&
|
|
from_kgid(&init_user_ns, attr->ia_gid) >= 0x10000)
|
|
goto out_unlock;
|
|
if ((attr->ia_valid & ATTR_SIZE) && attr->ia_size > inode->i_size)
|
|
goto out_unlock;
|
|
|
|
error = inode_change_ok(inode, attr);
|
|
if (error)
|
|
goto out_unlock;
|
|
|
|
if ((attr->ia_valid & ATTR_SIZE) &&
|
|
attr->ia_size != i_size_read(inode)) {
|
|
error = inode_newsize_ok(inode, attr->ia_size);
|
|
if (error)
|
|
goto out_unlock;
|
|
|
|
truncate_setsize(inode, attr->ia_size);
|
|
hpfs_truncate(inode);
|
|
}
|
|
|
|
setattr_copy(inode, attr);
|
|
|
|
hpfs_write_inode(inode);
|
|
|
|
out_unlock:
|
|
hpfs_unlock(inode->i_sb);
|
|
return error;
|
|
}
|
|
|
|
void hpfs_write_if_changed(struct inode *inode)
|
|
{
|
|
struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
|
|
|
|
if (hpfs_inode->i_dirty)
|
|
hpfs_write_inode(inode);
|
|
}
|
|
|
|
void hpfs_evict_inode(struct inode *inode)
|
|
{
|
|
truncate_inode_pages(&inode->i_data, 0);
|
|
clear_inode(inode);
|
|
if (!inode->i_nlink) {
|
|
hpfs_lock(inode->i_sb);
|
|
hpfs_remove_fnode(inode->i_sb, inode->i_ino);
|
|
hpfs_unlock(inode->i_sb);
|
|
}
|
|
}
|