int sysv_make_empty(struct inode *inode, struct inode *dir)
{
struct address_space *mapping = inode->i_mapping;
struct page *page = grab_cache_page(mapping, 0);
struct sysv_dir_entry * de;
char *base;
int err;
if (!page)
return -ENOMEM;
err = mapping->a_ops->prepare_write(NULL, page, 0, 2 * SYSV_DIRSIZE);
if (err)
goto fail;
base = (char*)page_address(page);
memset(base, 0, PAGE_CACHE_SIZE);
de = (struct sysv_dir_entry *) base;
de->inode = cpu_to_fs16(inode->i_sb, inode->i_ino);
strcpy(de->name,".");
de++;
de->inode = cpu_to_fs16(inode->i_sb, dir->i_ino);
strcpy(de->name,"..");
err = dir_commit_chunk(page, 0, 2 * SYSV_DIRSIZE);
fail:
UnlockPage(page);
page_cache_release(page);
return err;
}
void sysv_free_inode(struct inode * inode)
{
struct super_block *sb = inode->i_sb;
struct sysv_sb_info *sbi = SYSV_SB(sb);
unsigned int ino;
struct buffer_head * bh;
struct sysv_inode * raw_inode;
unsigned count;
sb = inode->i_sb;
ino = inode->i_ino;
if (ino <= SYSV_ROOT_INO || ino > sbi->s_ninodes) {
printk("sysv_free_inode: inode 0,1,2 or nonexistent inode\n");
return;
}
raw_inode = sysv_raw_inode(sb, ino, &bh);
if (!raw_inode) {
printk("sysv_free_inode: unable to read inode block on device "
"%s\n", inode->i_sb->s_id);
return;
}
lock_super(sb);
count = fs16_to_cpu(sbi, *sbi->s_sb_fic_count);
if (count < sbi->s_fic_size) {
*sv_sb_fic_inode(sb,count++) = cpu_to_fs16(sbi, ino);
*sbi->s_sb_fic_count = cpu_to_fs16(sbi, count);
}
fs16_add(sbi, sbi->s_sb_total_free_inodes, 1);
dirty_sb(sb);
memset(raw_inode, 0, sizeof(struct sysv_inode));
mark_buffer_dirty(bh);
unlock_super(sb);
brelse(bh);
}
int sysv_make_empty(struct inode *inode, struct inode *dir)
{
struct page *page = grab_cache_page(inode->i_mapping, 0);
struct sysv_dir_entry * de;
char *base;
int err;
if (!page)
return -ENOMEM;
err = sysv_prepare_chunk(page, 0, 2 * SYSV_DIRSIZE);
if (err) {
unlock_page(page);
goto fail;
}
kmap(page);
base = (char*)page_address(page);
memset(base, 0, PAGE_SIZE);
de = (struct sysv_dir_entry *) base;
de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), inode->i_ino);
strcpy(de->name,".");
de++;
de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), dir->i_ino);
strcpy(de->name,"..");
kunmap(page);
err = dir_commit_chunk(page, 0, 2 * SYSV_DIRSIZE);
fail:
put_page(page);
return err;
}
int sysv_make_empty(struct inode *inode, struct inode *dir)
{
struct address_space *mapping = inode->i_mapping;
struct page *page = grab_cache_page(mapping, 0);
struct sysv_dir_entry * de;
char *base;
int err;
if (!page)
return -ENOMEM;
err = __sysv_write_begin(NULL, mapping, 0, 2 * SYSV_DIRSIZE,
AOP_FLAG_UNINTERRUPTIBLE, &page, NULL);
if (err) {
unlock_page(page);
goto fail;
}
kmap(page);
base = (char*)page_address(page);
memset(base, 0, PAGE_CACHE_SIZE);
de = (struct sysv_dir_entry *) base;
de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), inode->i_ino);
strcpy(de->name,".");
de++;
de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), dir->i_ino);
strcpy(de->name,"..");
kunmap(page);
err = dir_commit_chunk(page, 0, 2 * SYSV_DIRSIZE);
fail:
page_cache_release(page);
return err;
}
sysv_zone_t sysv_new_block(struct super_block * sb)
{
struct sysv_sb_info *sbi = SYSV_SB(sb);
unsigned int block;
sysv_zone_t nr;
struct buffer_head * bh;
unsigned count;
mutex_lock(&sbi->s_lock);
count = fs16_to_cpu(sbi, *sbi->s_bcache_count);
if (count == 0) /* Applies only to Coherent FS */
goto Enospc;
nr = sbi->s_bcache[--count];
if (nr == 0) /* Applies only to Xenix FS, SystemV FS */
goto Enospc;
block = fs32_to_cpu(sbi, nr);
*sbi->s_bcache_count = cpu_to_fs16(sbi, count);
if (block < sbi->s_firstdatazone || block >= sbi->s_nzones) {
printk("sysv_new_block: new block %d is not in data zone\n",
block);
goto Enospc;
}
if (count == 0) { /* the last block continues the free list */
unsigned count;
block += sbi->s_block_base;
if (!(bh = sb_bread(sb, block))) {
printk("sysv_new_block: cannot read free-list block\n");
/* retry this same block next time */
*sbi->s_bcache_count = cpu_to_fs16(sbi, 1);
goto Enospc;
}
count = fs16_to_cpu(sbi, *(__fs16*)bh->b_data);
if (count > sbi->s_flc_size) {
printk("sysv_new_block: free-list block with %d >flc_size %d entries\n", count, sbi->s_flc_size );
brelse(bh);
goto Enospc;
}
*sbi->s_bcache_count = cpu_to_fs16(sbi, count);
memcpy(sbi->s_bcache, get_chunk(sb, bh),
count * sizeof(sysv_zone_t));
brelse(bh);
}
/* Now the free list head in the superblock is valid again. */
fs32_add(sbi, sbi->s_free_blocks, -1);
dirty_sb(sb);
mutex_unlock(&sbi->s_lock);
return nr;
Enospc:
mutex_unlock(&sbi->s_lock);
return 0;
}
void sysv_free_block(struct super_block * sb, sysv_zone_t nr)
{
struct sysv_sb_info * sbi = SYSV_SB(sb);
struct buffer_head * bh;
sysv_zone_t *blocks = sbi->s_bcache;
unsigned count;
unsigned block = fs32_to_cpu(sbi, nr);
/*
* This code does not work at all for AFS (it has a bitmap
* free list). As AFS is supposed to be read-only no one
* should call this for an AFS filesystem anyway...
*/
if (sbi->s_type == FSTYPE_AFS)
return;
if (block < sbi->s_firstdatazone || block >= sbi->s_nzones) {
printk("sysv_free_block: trying to free block not in datazone\n");
return;
}
mutex_lock(&sbi->s_lock);
count = fs16_to_cpu(sbi, *sbi->s_bcache_count);
if (count > sbi->s_flc_size) {
printk("sysv_free_block: flc_count %d > flc_size %d\n", count, sbi->s_flc_size);
mutex_unlock(&sbi->s_lock);
return;
}
/* If the free list head in super-block is full, it is copied
* into this block being freed, ditto if it's completely empty
* (applies only on Coherent).
*/
if (count == sbi->s_flc_size || count == 0) {
block += sbi->s_block_base;
bh = sb_getblk(sb, block);
if (!bh) {
printk("sysv_free_block: getblk() failed\n");
mutex_unlock(&sbi->s_lock);
return;
}
memset(bh->b_data, 0, sb->s_blocksize);
*(__fs16*)bh->b_data = cpu_to_fs16(sbi, count);
memcpy(get_chunk(sb,bh), blocks, count * sizeof(sysv_zone_t));
mark_buffer_dirty(bh);
set_buffer_uptodate(bh);
brelse(bh);
count = 0;
}
sbi->s_bcache[count++] = nr;
*sbi->s_bcache_count = cpu_to_fs16(sbi, count);
fs32_add(sbi, sbi->s_free_blocks, 1);
dirty_sb(sb);
mutex_unlock(&sbi->s_lock);
}
static int __sysv_write_inode(struct inode *inode, int wait)
{
struct super_block * sb = inode->i_sb;
struct sysv_sb_info * sbi = SYSV_SB(sb);
struct buffer_head * bh;
struct sysv_inode * raw_inode;
struct sysv_inode_info * si;
unsigned int ino, block;
int err = 0;
ino = inode->i_ino;
if (!ino || ino > sbi->s_ninodes) {
printk("Bad inode number on dev %s: %d is out of range\n",
inode->i_sb->s_id, ino);
return -EIO;
}
raw_inode = sysv_raw_inode(sb, ino, &bh);
if (!raw_inode) {
printk("unable to read i-node block\n");
return -EIO;
}
raw_inode->i_mode = cpu_to_fs16(sbi, inode->i_mode);
raw_inode->i_uid = cpu_to_fs16(sbi, fs_high2lowuid(inode->i_uid));
raw_inode->i_gid = cpu_to_fs16(sbi, fs_high2lowgid(inode->i_gid));
raw_inode->i_nlink = cpu_to_fs16(sbi, inode->i_nlink);
raw_inode->i_size = cpu_to_fs32(sbi, inode->i_size);
raw_inode->i_atime = cpu_to_fs32(sbi, inode->i_atime.tv_sec);
raw_inode->i_mtime = cpu_to_fs32(sbi, inode->i_mtime.tv_sec);
raw_inode->i_ctime = cpu_to_fs32(sbi, inode->i_ctime.tv_sec);
si = SYSV_I(inode);
if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
si->i_data[0] = cpu_to_fs32(sbi, old_encode_dev(inode->i_rdev));
for (block = 0; block < 10+1+1+1; block++)
write3byte(sbi, (u8 *)&si->i_data[block],
&raw_inode->i_data[3*block]);
mark_buffer_dirty(bh);
if (wait) {
sync_dirty_buffer(bh);
if (buffer_req(bh) && !buffer_uptodate(bh)) {
printk ("IO error syncing sysv inode [%s:%08x]\n",
sb->s_id, ino);
err = -EIO;
}
}
brelse(bh);
return 0;
}
static int refill_free_cache(struct super_block *sb)
{
struct sysv_sb_info *sbi = SYSV_SB(sb);
struct buffer_head * bh;
struct sysv_inode * raw_inode;
int i = 0, ino;
ino = SYSV_ROOT_INO+1;
raw_inode = sysv_raw_inode(sb, ino, &bh);
if (!raw_inode)
goto out;
while (ino <= sbi->s_ninodes) {
if (raw_inode->i_mode == 0 && raw_inode->i_nlink == 0) {
*sv_sb_fic_inode(sb,i++) = cpu_to_fs16(SYSV_SB(sb), ino);
if (i == sbi->s_fic_size)
break;
}
if ((ino++ & sbi->s_inodes_per_block_1) == 0) {
brelse(bh);
raw_inode = sysv_raw_inode(sb, ino, &bh);
if (!raw_inode)
goto out;
} else
raw_inode++;
}
brelse(bh);
out:
return i;
}
int sysv_add_link(struct dentry *dentry, struct inode *inode)
{
struct inode *dir = dentry->d_parent->d_inode;
const char * name = dentry->d_name.name;
int namelen = dentry->d_name.len;
struct page *page = NULL;
struct sysv_dir_entry * de;
unsigned long npages = dir_pages(dir);
unsigned long n;
char *kaddr;
loff_t pos;
int err;
/* We take care of directory expansion in the same loop */
for (n = 0; n <= npages; n++) {
page = dir_get_page(dir, n);
err = PTR_ERR(page);
if (IS_ERR(page))
goto out;
kaddr = (char*)page_address(page);
de = (struct sysv_dir_entry *)kaddr;
kaddr += PAGE_CACHE_SIZE - SYSV_DIRSIZE;
while ((char *)de <= kaddr) {
if (!de->inode)
goto got_it;
err = -EEXIST;
if (namecompare(namelen, SYSV_NAMELEN, name, de->name))
goto out_page;
de++;
}
dir_put_page(page);
}
BUG();
return -EINVAL;
got_it:
pos = page_offset(page) +
(char*)de - (char*)page_address(page);
lock_page(page);
err = __sysv_write_begin(NULL, page->mapping, pos, SYSV_DIRSIZE,
AOP_FLAG_UNINTERRUPTIBLE, &page, NULL);
if (err)
goto out_unlock;
memcpy (de->name, name, namelen);
memset (de->name + namelen, 0, SYSV_DIRSIZE - namelen - 2);
de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), inode->i_ino);
err = dir_commit_chunk(page, pos, SYSV_DIRSIZE);
dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
mark_inode_dirty(dir);
out_page:
dir_put_page(page);
out:
return err;
out_unlock:
unlock_page(page);
goto out_page;
}
int sysv_add_link(struct dentry *dentry, struct inode *inode)
{
struct inode *dir = dentry->d_parent->d_inode;
const char * name = dentry->d_name.name;
int namelen = dentry->d_name.len;
struct page *page = NULL;
struct sysv_dir_entry * de;
unsigned long npages = dir_pages(dir);
unsigned long n;
char *kaddr;
unsigned from, to;
int err;
/* We take care of directory expansion in the same loop */
for (n = 0; n <= npages; n++) {
page = dir_get_page(dir, n);
err = PTR_ERR(page);
if (IS_ERR(page))
goto out;
kaddr = (char*)page_address(page);
de = (struct sysv_dir_entry *)kaddr;
kaddr += PAGE_CACHE_SIZE - SYSV_DIRSIZE;
while ((char *)de <= kaddr) {
if (!de->inode)
goto got_it;
err = -EEXIST;
if (namecompare(namelen, SYSV_NAMELEN, name, de->name))
goto out_page;
de++;
}
dir_put_page(page);
}
BUG();
return -EINVAL;
got_it:
from = (char*)de - (char*)page_address(page);
to = from + SYSV_DIRSIZE;
lock_page(page);
err = page->mapping->a_ops->prepare_write(NULL, page, from, to);
if (err)
goto out_unlock;
memcpy (de->name, name, namelen);
memset (de->name + namelen, 0, SYSV_DIRSIZE - namelen - 2);
de->inode = cpu_to_fs16(inode->i_sb, inode->i_ino);
err = dir_commit_chunk(page, from, to);
dir->i_mtime = dir->i_ctime = CURRENT_TIME;
mark_inode_dirty(dir);
out_unlock:
UnlockPage(page);
out_page:
dir_put_page(page);
out:
return err;
}
unsigned long sysv_count_free_inodes(struct super_block * sb)
{
struct sysv_sb_info *sbi = SYSV_SB(sb);
struct buffer_head * bh;
struct sysv_inode * raw_inode;
int ino, count, sb_count;
lock_super(sb);
sb_count = fs16_to_cpu(sbi, *sbi->s_sb_total_free_inodes);
if (0)
goto trust_sb;
/* this causes a lot of disk traffic ... */
count = 0;
ino = SYSV_ROOT_INO+1;
raw_inode = sysv_raw_inode(sb, ino, &bh);
if (!raw_inode)
goto Eio;
while (ino <= sbi->s_ninodes) {
if (raw_inode->i_mode == 0 && raw_inode->i_nlink == 0)
count++;
if ((ino++ & sbi->s_inodes_per_block_1) == 0) {
brelse(bh);
raw_inode = sysv_raw_inode(sb, ino, &bh);
if (!raw_inode)
goto Eio;
} else
raw_inode++;
}
brelse(bh);
if (count != sb_count)
goto Einval;
out:
unlock_super(sb);
return count;
Einval:
printk("sysv_count_free_inodes: "
"free inode count was %d, correcting to %d\n",
sb_count, count);
if (!(sb->s_flags & MS_RDONLY)) {
*sbi->s_sb_total_free_inodes = cpu_to_fs16(SYSV_SB(sb), count);
dirty_sb(sb);
}
goto out;
Eio:
printk("sysv_count_free_inodes: unable to read inode table\n");
trust_sb:
count = sb_count;
goto out;
}
static struct buffer_head * sysv_update_inode(struct inode * inode)
{
struct super_block * sb = inode->i_sb;
struct sysv_sb_info * sbi = SYSV_SB(sb);
struct buffer_head * bh;
struct sysv_inode * raw_inode;
struct sysv_inode_info * si;
unsigned int ino, block;
ino = inode->i_ino;
if (!ino || ino > sbi->s_ninodes) {
printk("Bad inode number on dev %s: %d is out of range\n",
inode->i_sb->s_id, ino);
return NULL;
}
raw_inode = sysv_raw_inode(sb, ino, &bh);
if (!raw_inode) {
printk("unable to read i-node block\n");
return NULL;
}
raw_inode->i_mode = cpu_to_fs16(sbi, inode->i_mode);
raw_inode->i_uid = cpu_to_fs16(sbi, fs_high2lowuid(inode->i_uid));
raw_inode->i_gid = cpu_to_fs16(sbi, fs_high2lowgid(inode->i_gid));
raw_inode->i_nlink = cpu_to_fs16(sbi, inode->i_nlink);
raw_inode->i_size = cpu_to_fs32(sbi, inode->i_size);
raw_inode->i_atime = cpu_to_fs32(sbi, inode->i_atime.tv_sec);
raw_inode->i_mtime = cpu_to_fs32(sbi, inode->i_mtime.tv_sec);
raw_inode->i_ctime = cpu_to_fs32(sbi, inode->i_ctime.tv_sec);
si = SYSV_I(inode);
if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
si->i_data[0] = cpu_to_fs32(sbi, old_encode_dev(inode->i_rdev));
for (block = 0; block < 10+1+1+1; block++)
write3byte(sbi, (u8 *)&si->i_data[block],
&raw_inode->i_data[3*block]);
mark_buffer_dirty(bh);
return bh;
}
struct inode * sysv_new_inode(const struct inode * dir, mode_t mode)
{
struct super_block *sb = dir->i_sb;
struct sysv_sb_info *sbi = SYSV_SB(sb);
struct inode *inode;
u16 ino;
unsigned count;
inode = new_inode(sb);
if (!inode)
return ERR_PTR(-ENOMEM);
lock_super(sb);
count = fs16_to_cpu(sbi, *sbi->s_sb_fic_count);
if (count == 0 || (*sv_sb_fic_inode(sb,count-1) == 0)) {
count = refill_free_cache(sb);
if (count == 0) {
iput(inode);
unlock_super(sb);
return ERR_PTR(-ENOSPC);
}
}
/* Now count > 0. */
ino = *sv_sb_fic_inode(sb,--count);
*sbi->s_sb_fic_count = cpu_to_fs16(sbi, count);
fs16_add(sbi, sbi->s_sb_total_free_inodes, -1);
dirty_sb(sb);
if (dir->i_mode & S_ISGID) {
inode->i_gid = dir->i_gid;
if (S_ISDIR(mode))
mode |= S_ISGID;
} else
inode->i_gid = current->fsgid;
inode->i_uid = current->fsuid;
inode->i_ino = fs16_to_cpu(sbi, ino);
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
inode->i_blocks = inode->i_blksize = 0;
memset(SYSV_I(inode)->i_data, 0, sizeof(SYSV_I(inode)->i_data));
SYSV_I(inode)->i_dir_start_lookup = 0;
insert_inode_hash(inode);
mark_inode_dirty(inode);
inode->i_mode = mode; /* for sysv_write_inode() */
sysv_write_inode(inode, 0); /* ensure inode not allocated again */
mark_inode_dirty(inode); /* cleared by sysv_write_inode() */
/* That's it. */
unlock_super(sb);
return inode;
}
static struct buffer_head * sysv_update_inode(struct inode * inode)
{
struct super_block * sb = inode->i_sb;
struct buffer_head * bh;
struct sysv_inode * raw_inode;
unsigned int ino, block;
ino = inode->i_ino;
if (!ino || ino > sb->sv_ninodes) {
printk("Bad inode number on dev %s: %d is out of range\n",
inode->i_sb->s_id, ino);
return 0;
}
raw_inode = sysv_raw_inode(sb, ino, &bh);
if (!raw_inode) {
printk("unable to read i-node block\n");
return 0;
}
raw_inode->i_mode = cpu_to_fs16(sb, inode->i_mode);
raw_inode->i_uid = cpu_to_fs16(sb, fs_high2lowuid(inode->i_uid));
raw_inode->i_gid = cpu_to_fs16(sb, fs_high2lowgid(inode->i_gid));
raw_inode->i_nlink = cpu_to_fs16(sb, inode->i_nlink);
raw_inode->i_size = cpu_to_fs32(sb, inode->i_size);
raw_inode->i_atime = cpu_to_fs32(sb, inode->i_atime);
raw_inode->i_mtime = cpu_to_fs32(sb, inode->i_mtime);
raw_inode->i_ctime = cpu_to_fs32(sb, inode->i_ctime);
if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
inode->u.sysv_i.i_data[0] =
cpu_to_fs32(sb, kdev_t_to_nr(inode->i_rdev));
for (block = 0; block < 10+1+1+1; block++)
write3byte(sb, (unsigned char*)&inode->u.sysv_i.i_data[block],
&raw_inode->i_a.i_addb[3*block]);
mark_buffer_dirty(bh);
return bh;
}
/* Releases the page */
void sysv_set_link(struct sysv_dir_entry *de, struct page *page,
struct inode *inode)
{
struct inode *dir = page->mapping->host;
loff_t pos = page_offset(page) +
(char *)de-(char*)page_address(page);
int err;
lock_page(page);
err = sysv_prepare_chunk(page, pos, SYSV_DIRSIZE);
BUG_ON(err);
de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), inode->i_ino);
err = dir_commit_chunk(page, pos, SYSV_DIRSIZE);
dir_put_page(page);
dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
mark_inode_dirty(dir);
}
/* Releases the page */
void sysv_set_link(struct sysv_dir_entry *de, struct page *page,
struct inode *inode)
{
struct inode *dir = (struct inode*)page->mapping->host;
unsigned from = (char *)de-(char*)page_address(page);
unsigned to = from + SYSV_DIRSIZE;
int err;
lock_page(page);
err = page->mapping->a_ops->prepare_write(NULL, page, from, to);
BUG_ON(err);
de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), inode->i_ino);
err = dir_commit_chunk(page, from, to);
dir_put_page(page);
dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
mark_inode_dirty(dir);
}
struct inode * sysv_new_inode(const struct inode * dir, umode_t mode)
{
struct super_block *sb = dir->i_sb;
struct sysv_sb_info *sbi = SYSV_SB(sb);
struct inode *inode;
sysv_ino_t ino;
unsigned count;
struct writeback_control wbc = {
.sync_mode = WB_SYNC_NONE
};
inode = new_inode(sb);
if (!inode)
return ERR_PTR(-ENOMEM);
lock_super(sb);
count = fs16_to_cpu(sbi, *sbi->s_sb_fic_count);
if (count == 0 || (*sv_sb_fic_inode(sb,count-1) == 0)) {
count = refill_free_cache(sb);
if (count == 0) {
iput(inode);
unlock_super(sb);
return ERR_PTR(-ENOSPC);
}
}
/* Now count > 0. */
ino = *sv_sb_fic_inode(sb,--count);
*sbi->s_sb_fic_count = cpu_to_fs16(sbi, count);
fs16_add(sbi, sbi->s_sb_total_free_inodes, -1);
dirty_sb(sb);
inode_init_owner(inode, dir, mode);
inode->i_ino = fs16_to_cpu(sbi, ino);
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
inode->i_blocks = 0;
memset(SYSV_I(inode)->i_data, 0, sizeof(SYSV_I(inode)->i_data));
SYSV_I(inode)->i_dir_start_lookup = 0;
insert_inode_hash(inode);
mark_inode_dirty(inode);
sysv_write_inode(inode, &wbc); /* ensure inode not allocated again */
mark_inode_dirty(inode); /* cleared by sysv_write_inode() */
/* That's it. */
unlock_super(sb);
return inode;
}
/* Releases the page */
void sysv_set_link(struct sysv_dir_entry *de, struct page *page,
struct inode *inode)
{
struct address_space *mapping = page->mapping;
struct inode *dir = mapping->host;
loff_t pos = page_offset(page) +
(char *)de-(char*)page_address(page);
int err;
lock_page(page);
err = __sysv_write_begin(NULL, mapping, pos, SYSV_DIRSIZE,
AOP_FLAG_UNINTERRUPTIBLE, &page, NULL);
BUG_ON(err);
de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), inode->i_ino);
err = dir_commit_chunk(page, pos, SYSV_DIRSIZE);
dir_put_page(page);
dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
mark_inode_dirty(dir);
}
/*
* routine to check that the specified directory is empty (for rmdir)
*/
int sysv_empty_dir(struct inode * inode)
{
struct super_block *sb = inode->i_sb;
struct page *page = NULL;
unsigned long i, npages = dir_pages(inode);
for (i = 0; i < npages; i++) {
char *kaddr;
struct sysv_dir_entry * de;
page = dir_get_page(inode, i);
if (IS_ERR(page))
continue;
kaddr = (char *)page_address(page);
de = (struct sysv_dir_entry *)kaddr;
kaddr += PAGE_CACHE_SIZE-SYSV_DIRSIZE;
for ( ;(char *)de <= kaddr; de++) {
if (!de->inode)
continue;
/* check for . and .. */
if (de->name[0] != '.')
goto not_empty;
if (!de->name[1]) {
if (de->inode == cpu_to_fs16(SYSV_SB(sb),
inode->i_ino))
continue;
goto not_empty;
}
if (de->name[1] != '.' || de->name[2])
goto not_empty;
}
dir_put_page(page);
}
return 1;
not_empty:
dir_put_page(page);
return 0;
}
