417 lines
10 KiB
C
417 lines
10 KiB
C
/*
|
|
* linux/fs/affs/inode.c
|
|
*
|
|
* (c) 1996 Hans-Joachim Widmaier - Rewritten
|
|
*
|
|
* (C) 1993 Ray Burr - Modified for Amiga FFS filesystem.
|
|
*
|
|
* (C) 1992 Eric Youngdale Modified for ISO9660 filesystem.
|
|
*
|
|
* (C) 1991 Linus Torvalds - minix filesystem
|
|
*/
|
|
#include <linux/sched.h>
|
|
#include <linux/gfp.h>
|
|
#include "affs.h"
|
|
|
|
struct inode *affs_iget(struct super_block *sb, unsigned long ino)
|
|
{
|
|
struct affs_sb_info *sbi = AFFS_SB(sb);
|
|
struct buffer_head *bh;
|
|
struct affs_tail *tail;
|
|
struct inode *inode;
|
|
u32 block;
|
|
u32 size;
|
|
u32 prot;
|
|
u16 id;
|
|
|
|
inode = iget_locked(sb, ino);
|
|
if (!inode)
|
|
return ERR_PTR(-ENOMEM);
|
|
if (!(inode->i_state & I_NEW))
|
|
return inode;
|
|
|
|
pr_debug("affs_iget(%lu)\n", inode->i_ino);
|
|
|
|
block = inode->i_ino;
|
|
bh = affs_bread(sb, block);
|
|
if (!bh) {
|
|
affs_warning(sb, "read_inode", "Cannot read block %d", block);
|
|
goto bad_inode;
|
|
}
|
|
if (affs_checksum_block(sb, bh) || be32_to_cpu(AFFS_HEAD(bh)->ptype) != T_SHORT) {
|
|
affs_warning(sb,"read_inode",
|
|
"Checksum or type (ptype=%d) error on inode %d",
|
|
AFFS_HEAD(bh)->ptype, block);
|
|
goto bad_inode;
|
|
}
|
|
|
|
tail = AFFS_TAIL(sb, bh);
|
|
prot = be32_to_cpu(tail->protect);
|
|
|
|
inode->i_size = 0;
|
|
set_nlink(inode, 1);
|
|
inode->i_mode = 0;
|
|
AFFS_I(inode)->i_extcnt = 1;
|
|
AFFS_I(inode)->i_ext_last = ~1;
|
|
AFFS_I(inode)->i_protect = prot;
|
|
atomic_set(&AFFS_I(inode)->i_opencnt, 0);
|
|
AFFS_I(inode)->i_blkcnt = 0;
|
|
AFFS_I(inode)->i_lc = NULL;
|
|
AFFS_I(inode)->i_lc_size = 0;
|
|
AFFS_I(inode)->i_lc_shift = 0;
|
|
AFFS_I(inode)->i_lc_mask = 0;
|
|
AFFS_I(inode)->i_ac = NULL;
|
|
AFFS_I(inode)->i_ext_bh = NULL;
|
|
AFFS_I(inode)->mmu_private = 0;
|
|
AFFS_I(inode)->i_lastalloc = 0;
|
|
AFFS_I(inode)->i_pa_cnt = 0;
|
|
|
|
if (affs_test_opt(sbi->s_flags, SF_SETMODE))
|
|
inode->i_mode = sbi->s_mode;
|
|
else
|
|
inode->i_mode = prot_to_mode(prot);
|
|
|
|
id = be16_to_cpu(tail->uid);
|
|
if (id == 0 || affs_test_opt(sbi->s_flags, SF_SETUID))
|
|
inode->i_uid = sbi->s_uid;
|
|
else if (id == 0xFFFF && affs_test_opt(sbi->s_flags, SF_MUFS))
|
|
i_uid_write(inode, 0);
|
|
else
|
|
i_uid_write(inode, id);
|
|
|
|
id = be16_to_cpu(tail->gid);
|
|
if (id == 0 || affs_test_opt(sbi->s_flags, SF_SETGID))
|
|
inode->i_gid = sbi->s_gid;
|
|
else if (id == 0xFFFF && affs_test_opt(sbi->s_flags, SF_MUFS))
|
|
i_gid_write(inode, 0);
|
|
else
|
|
i_gid_write(inode, id);
|
|
|
|
switch (be32_to_cpu(tail->stype)) {
|
|
case ST_ROOT:
|
|
inode->i_uid = sbi->s_uid;
|
|
inode->i_gid = sbi->s_gid;
|
|
/* fall through */
|
|
case ST_USERDIR:
|
|
if (be32_to_cpu(tail->stype) == ST_USERDIR ||
|
|
affs_test_opt(sbi->s_flags, SF_SETMODE)) {
|
|
if (inode->i_mode & S_IRUSR)
|
|
inode->i_mode |= S_IXUSR;
|
|
if (inode->i_mode & S_IRGRP)
|
|
inode->i_mode |= S_IXGRP;
|
|
if (inode->i_mode & S_IROTH)
|
|
inode->i_mode |= S_IXOTH;
|
|
inode->i_mode |= S_IFDIR;
|
|
} else
|
|
inode->i_mode = S_IRUGO | S_IXUGO | S_IWUSR | S_IFDIR;
|
|
/* Maybe it should be controlled by mount parameter? */
|
|
//inode->i_mode |= S_ISVTX;
|
|
inode->i_op = &affs_dir_inode_operations;
|
|
inode->i_fop = &affs_dir_operations;
|
|
break;
|
|
case ST_LINKDIR:
|
|
#if 0
|
|
affs_warning(sb, "read_inode", "inode is LINKDIR");
|
|
goto bad_inode;
|
|
#else
|
|
inode->i_mode |= S_IFDIR;
|
|
/* ... and leave ->i_op and ->i_fop pointing to empty */
|
|
break;
|
|
#endif
|
|
case ST_LINKFILE:
|
|
affs_warning(sb, "read_inode", "inode is LINKFILE");
|
|
goto bad_inode;
|
|
case ST_FILE:
|
|
size = be32_to_cpu(tail->size);
|
|
inode->i_mode |= S_IFREG;
|
|
AFFS_I(inode)->mmu_private = inode->i_size = size;
|
|
if (inode->i_size) {
|
|
AFFS_I(inode)->i_blkcnt = (size - 1) /
|
|
sbi->s_data_blksize + 1;
|
|
AFFS_I(inode)->i_extcnt = (AFFS_I(inode)->i_blkcnt - 1) /
|
|
sbi->s_hashsize + 1;
|
|
}
|
|
if (tail->link_chain)
|
|
set_nlink(inode, 2);
|
|
inode->i_mapping->a_ops = affs_test_opt(sbi->s_flags, SF_OFS) ?
|
|
&affs_aops_ofs : &affs_aops;
|
|
inode->i_op = &affs_file_inode_operations;
|
|
inode->i_fop = &affs_file_operations;
|
|
break;
|
|
case ST_SOFTLINK:
|
|
inode->i_mode |= S_IFLNK;
|
|
inode->i_op = &affs_symlink_inode_operations;
|
|
inode->i_data.a_ops = &affs_symlink_aops;
|
|
break;
|
|
}
|
|
|
|
inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec
|
|
= (be32_to_cpu(tail->change.days) * (24 * 60 * 60) +
|
|
be32_to_cpu(tail->change.mins) * 60 +
|
|
be32_to_cpu(tail->change.ticks) / 50 +
|
|
((8 * 365 + 2) * 24 * 60 * 60)) +
|
|
sys_tz.tz_minuteswest * 60;
|
|
inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec = inode->i_atime.tv_nsec = 0;
|
|
affs_brelse(bh);
|
|
unlock_new_inode(inode);
|
|
return inode;
|
|
|
|
bad_inode:
|
|
affs_brelse(bh);
|
|
iget_failed(inode);
|
|
return ERR_PTR(-EIO);
|
|
}
|
|
|
|
int
|
|
affs_write_inode(struct inode *inode, struct writeback_control *wbc)
|
|
{
|
|
struct super_block *sb = inode->i_sb;
|
|
struct buffer_head *bh;
|
|
struct affs_tail *tail;
|
|
uid_t uid;
|
|
gid_t gid;
|
|
|
|
pr_debug("write_inode(%lu)\n", inode->i_ino);
|
|
|
|
if (!inode->i_nlink)
|
|
// possibly free block
|
|
return 0;
|
|
bh = affs_bread(sb, inode->i_ino);
|
|
if (!bh) {
|
|
affs_error(sb,"write_inode","Cannot read block %lu",inode->i_ino);
|
|
return -EIO;
|
|
}
|
|
tail = AFFS_TAIL(sb, bh);
|
|
if (tail->stype == cpu_to_be32(ST_ROOT)) {
|
|
secs_to_datestamp(inode->i_mtime.tv_sec,&AFFS_ROOT_TAIL(sb, bh)->root_change);
|
|
} else {
|
|
tail->protect = cpu_to_be32(AFFS_I(inode)->i_protect);
|
|
tail->size = cpu_to_be32(inode->i_size);
|
|
secs_to_datestamp(inode->i_mtime.tv_sec,&tail->change);
|
|
if (!(inode->i_ino == AFFS_SB(sb)->s_root_block)) {
|
|
uid = i_uid_read(inode);
|
|
gid = i_gid_read(inode);
|
|
if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_MUFS)) {
|
|
if (uid == 0 || uid == 0xFFFF)
|
|
uid = uid ^ ~0;
|
|
if (gid == 0 || gid == 0xFFFF)
|
|
gid = gid ^ ~0;
|
|
}
|
|
if (!affs_test_opt(AFFS_SB(sb)->s_flags, SF_SETUID))
|
|
tail->uid = cpu_to_be16(uid);
|
|
if (!affs_test_opt(AFFS_SB(sb)->s_flags, SF_SETGID))
|
|
tail->gid = cpu_to_be16(gid);
|
|
}
|
|
}
|
|
affs_fix_checksum(sb, bh);
|
|
mark_buffer_dirty_inode(bh, inode);
|
|
affs_brelse(bh);
|
|
affs_free_prealloc(inode);
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
affs_notify_change(struct dentry *dentry, struct iattr *attr)
|
|
{
|
|
struct inode *inode = d_inode(dentry);
|
|
int error;
|
|
|
|
pr_debug("notify_change(%lu,0x%x)\n", inode->i_ino, attr->ia_valid);
|
|
|
|
error = inode_change_ok(inode,attr);
|
|
if (error)
|
|
goto out;
|
|
|
|
if (((attr->ia_valid & ATTR_UID) &&
|
|
affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_SETUID)) ||
|
|
((attr->ia_valid & ATTR_GID) &&
|
|
affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_SETGID)) ||
|
|
((attr->ia_valid & ATTR_MODE) &&
|
|
(AFFS_SB(inode->i_sb)->s_flags &
|
|
(AFFS_MOUNT_SF_SETMODE | AFFS_MOUNT_SF_IMMUTABLE)))) {
|
|
if (!affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_QUIET))
|
|
error = -EPERM;
|
|
goto out;
|
|
}
|
|
|
|
if ((attr->ia_valid & ATTR_SIZE) &&
|
|
attr->ia_size != i_size_read(inode)) {
|
|
error = inode_newsize_ok(inode, attr->ia_size);
|
|
if (error)
|
|
return error;
|
|
|
|
truncate_setsize(inode, attr->ia_size);
|
|
affs_truncate(inode);
|
|
}
|
|
|
|
setattr_copy(inode, attr);
|
|
mark_inode_dirty(inode);
|
|
|
|
if (attr->ia_valid & ATTR_MODE)
|
|
mode_to_prot(inode);
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
void
|
|
affs_evict_inode(struct inode *inode)
|
|
{
|
|
unsigned long cache_page;
|
|
pr_debug("evict_inode(ino=%lu, nlink=%u)\n",
|
|
inode->i_ino, inode->i_nlink);
|
|
truncate_inode_pages_final(&inode->i_data);
|
|
|
|
if (!inode->i_nlink) {
|
|
inode->i_size = 0;
|
|
affs_truncate(inode);
|
|
}
|
|
|
|
invalidate_inode_buffers(inode);
|
|
clear_inode(inode);
|
|
affs_free_prealloc(inode);
|
|
cache_page = (unsigned long)AFFS_I(inode)->i_lc;
|
|
if (cache_page) {
|
|
pr_debug("freeing ext cache\n");
|
|
AFFS_I(inode)->i_lc = NULL;
|
|
AFFS_I(inode)->i_ac = NULL;
|
|
free_page(cache_page);
|
|
}
|
|
affs_brelse(AFFS_I(inode)->i_ext_bh);
|
|
AFFS_I(inode)->i_ext_last = ~1;
|
|
AFFS_I(inode)->i_ext_bh = NULL;
|
|
|
|
if (!inode->i_nlink)
|
|
affs_free_block(inode->i_sb, inode->i_ino);
|
|
}
|
|
|
|
struct inode *
|
|
affs_new_inode(struct inode *dir)
|
|
{
|
|
struct super_block *sb = dir->i_sb;
|
|
struct inode *inode;
|
|
u32 block;
|
|
struct buffer_head *bh;
|
|
|
|
if (!(inode = new_inode(sb)))
|
|
goto err_inode;
|
|
|
|
if (!(block = affs_alloc_block(dir, dir->i_ino)))
|
|
goto err_block;
|
|
|
|
bh = affs_getzeroblk(sb, block);
|
|
if (!bh)
|
|
goto err_bh;
|
|
mark_buffer_dirty_inode(bh, inode);
|
|
affs_brelse(bh);
|
|
|
|
inode->i_uid = current_fsuid();
|
|
inode->i_gid = current_fsgid();
|
|
inode->i_ino = block;
|
|
set_nlink(inode, 1);
|
|
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
|
|
atomic_set(&AFFS_I(inode)->i_opencnt, 0);
|
|
AFFS_I(inode)->i_blkcnt = 0;
|
|
AFFS_I(inode)->i_lc = NULL;
|
|
AFFS_I(inode)->i_lc_size = 0;
|
|
AFFS_I(inode)->i_lc_shift = 0;
|
|
AFFS_I(inode)->i_lc_mask = 0;
|
|
AFFS_I(inode)->i_ac = NULL;
|
|
AFFS_I(inode)->i_ext_bh = NULL;
|
|
AFFS_I(inode)->mmu_private = 0;
|
|
AFFS_I(inode)->i_protect = 0;
|
|
AFFS_I(inode)->i_lastalloc = 0;
|
|
AFFS_I(inode)->i_pa_cnt = 0;
|
|
AFFS_I(inode)->i_extcnt = 1;
|
|
AFFS_I(inode)->i_ext_last = ~1;
|
|
|
|
insert_inode_hash(inode);
|
|
|
|
return inode;
|
|
|
|
err_bh:
|
|
affs_free_block(sb, block);
|
|
err_block:
|
|
iput(inode);
|
|
err_inode:
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Add an entry to a directory. Create the header block
|
|
* and insert it into the hash table.
|
|
*/
|
|
|
|
int
|
|
affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type)
|
|
{
|
|
struct super_block *sb = dir->i_sb;
|
|
struct buffer_head *inode_bh = NULL;
|
|
struct buffer_head *bh;
|
|
u32 block = 0;
|
|
int retval;
|
|
|
|
pr_debug("%s(dir=%lu, inode=%lu, \"%pd\", type=%d)\n", __func__,
|
|
dir->i_ino, inode->i_ino, dentry, type);
|
|
|
|
retval = -EIO;
|
|
bh = affs_bread(sb, inode->i_ino);
|
|
if (!bh)
|
|
goto done;
|
|
|
|
affs_lock_link(inode);
|
|
switch (type) {
|
|
case ST_LINKFILE:
|
|
case ST_LINKDIR:
|
|
retval = -ENOSPC;
|
|
block = affs_alloc_block(dir, dir->i_ino);
|
|
if (!block)
|
|
goto err;
|
|
retval = -EIO;
|
|
inode_bh = bh;
|
|
bh = affs_getzeroblk(sb, block);
|
|
if (!bh)
|
|
goto err;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
AFFS_HEAD(bh)->ptype = cpu_to_be32(T_SHORT);
|
|
AFFS_HEAD(bh)->key = cpu_to_be32(bh->b_blocknr);
|
|
affs_copy_name(AFFS_TAIL(sb, bh)->name, dentry);
|
|
AFFS_TAIL(sb, bh)->stype = cpu_to_be32(type);
|
|
AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino);
|
|
|
|
if (inode_bh) {
|
|
__be32 chain;
|
|
chain = AFFS_TAIL(sb, inode_bh)->link_chain;
|
|
AFFS_TAIL(sb, bh)->original = cpu_to_be32(inode->i_ino);
|
|
AFFS_TAIL(sb, bh)->link_chain = chain;
|
|
AFFS_TAIL(sb, inode_bh)->link_chain = cpu_to_be32(block);
|
|
affs_adjust_checksum(inode_bh, block - be32_to_cpu(chain));
|
|
mark_buffer_dirty_inode(inode_bh, inode);
|
|
set_nlink(inode, 2);
|
|
ihold(inode);
|
|
}
|
|
affs_fix_checksum(sb, bh);
|
|
mark_buffer_dirty_inode(bh, inode);
|
|
dentry->d_fsdata = (void *)(long)bh->b_blocknr;
|
|
|
|
affs_lock_dir(dir);
|
|
retval = affs_insert_hash(dir, bh);
|
|
mark_buffer_dirty_inode(bh, inode);
|
|
affs_unlock_dir(dir);
|
|
affs_unlock_link(inode);
|
|
|
|
d_instantiate(dentry, inode);
|
|
done:
|
|
affs_brelse(inode_bh);
|
|
affs_brelse(bh);
|
|
return retval;
|
|
err:
|
|
if (block)
|
|
affs_free_block(sb, block);
|
|
affs_unlock_link(inode);
|
|
goto done;
|
|
}
|