/*
** reiserfs_unpack
** Function try to convert tail from direct item into indirect.
** It set up nopack attribute in the REISERFS_I(inode)->nopack
*/
int reiserfs_unpack(struct inode *inode, struct file *filp)
{
int retval = 0;
int depth;
int index;
struct page *page;
struct address_space *mapping;
unsigned long write_from;
unsigned long blocksize = inode->i_sb->s_blocksize;
if (inode->i_size == 0) {
REISERFS_I(inode)->i_flags |= i_nopack_mask;
return 0;
}
/* ioctl already done */
if (REISERFS_I(inode)->i_flags & i_nopack_mask) {
return 0;
}
depth = reiserfs_write_lock_once(inode->i_sb);
/* we need to make sure nobody is changing the file size beneath us */
reiserfs_mutex_lock_safe(&inode->i_mutex, inode->i_sb);
write_from = inode->i_size & (blocksize - 1);
/* if we are on a block boundary, we are already unpacked. */
if (write_from == 0) {
REISERFS_I(inode)->i_flags |= i_nopack_mask;
goto out;
}
/* we unpack by finding the page with the tail, and calling
** reiserfs_prepare_write on that page. This will force a
** reiserfs_get_block to unpack the tail for us.
*/
index = inode->i_size >> PAGE_CACHE_SHIFT;
mapping = inode->i_mapping;
page = grab_cache_page(mapping, index);
retval = -ENOMEM;
if (!page) {
goto out;
}
retval = reiserfs_prepare_write(NULL, page, write_from, write_from);
if (retval)
goto out_unlock;
/* conversion can change page contents, must flush */
flush_dcache_page(page);
retval = reiserfs_commit_write(NULL, page, write_from, write_from);
REISERFS_I(inode)->i_flags |= i_nopack_mask;
out_unlock:
unlock_page(page);
page_cache_release(page);
out:
mutex_unlock(&inode->i_mutex);
reiserfs_write_unlock_once(inode->i_sb, depth);
return retval;
}
static struct dentry *reiserfs_lookup(struct inode *dir, struct dentry *dentry,
struct nameidata *nd)
{
int retval;
int lock_depth;
struct inode *inode = NULL;
struct reiserfs_dir_entry de;
INITIALIZE_PATH(path_to_entry);
if (REISERFS_MAX_NAME(dir->i_sb->s_blocksize) < dentry->d_name.len)
return ERR_PTR(-ENAMETOOLONG);
/*
* Might be called with or without the write lock, must be careful
* to not recursively hold it in case we want to release the lock
* before rescheduling.
*/
lock_depth = reiserfs_write_lock_once(dir->i_sb);
de.de_gen_number_bit_string = NULL;
retval =
reiserfs_find_entry(dir, dentry->d_name.name, dentry->d_name.len,
&path_to_entry, &de);
pathrelse(&path_to_entry);
if (retval == NAME_FOUND) {
inode = reiserfs_iget(dir->i_sb,
(struct cpu_key *)&(de.de_dir_id));
if (!inode || IS_ERR(inode)) {
reiserfs_write_unlock_once(dir->i_sb, lock_depth);
return ERR_PTR(-EACCES);
}
/* Propagate the private flag so we know we're
* in the priv tree */
if (IS_PRIVATE(dir))
inode->i_flags |= S_PRIVATE;
}
reiserfs_write_unlock_once(dir->i_sb, lock_depth);
if (retval == IO_ERROR) {
return ERR_PTR(-EIO);
}
return d_splice_alias(inode, dentry);
}
int reiserfs_acl_chmod(struct inode *inode)
{
struct posix_acl *acl, *clone;
int error;
if (S_ISLNK(inode->i_mode))
return -EOPNOTSUPP;
if (get_inode_sd_version(inode) == STAT_DATA_V1 ||
!reiserfs_posixacl(inode->i_sb)) {
return 0;
}
reiserfs_write_unlock(inode->i_sb);
acl = reiserfs_get_acl(inode, ACL_TYPE_ACCESS);
reiserfs_write_lock(inode->i_sb);
if (!acl)
return 0;
if (IS_ERR(acl))
return PTR_ERR(acl);
clone = posix_acl_clone(acl, GFP_NOFS);
posix_acl_release(acl);
if (!clone)
return -ENOMEM;
error = posix_acl_chmod_masq(clone, inode->i_mode);
if (!error) {
struct reiserfs_transaction_handle th;
size_t size = reiserfs_xattr_nblocks(inode,
reiserfs_acl_size(clone->a_count));
int depth;
depth = reiserfs_write_lock_once(inode->i_sb);
error = journal_begin(&th, inode->i_sb, size * 2);
if (!error) {
int error2;
error = reiserfs_set_acl(&th, inode, ACL_TYPE_ACCESS,
clone);
error2 = journal_end(&th, inode->i_sb, size * 2);
if (error2)
error = error2;
}
reiserfs_write_unlock_once(inode->i_sb, depth);
}
posix_acl_release(clone);
return error;
}
static int reiserfs_unlink(struct inode *dir, struct dentry *dentry)
{
int retval, err;
struct inode *inode;
struct reiserfs_dir_entry de;
INITIALIZE_PATH(path);
struct reiserfs_transaction_handle th;
int jbegin_count;
unsigned long savelink;
int depth;
dquot_initialize(dir);
inode = dentry->d_inode;
/* in this transaction we can be doing at max two balancings and update
* two stat datas, we change quotas of the owner of the directory and of
* the owner of the parent directory. The quota structure is possibly
* deleted only on iput => outside of this transaction */
jbegin_count =
JOURNAL_PER_BALANCE_CNT * 2 + 2 +
4 * REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb);
depth = reiserfs_write_lock_once(dir->i_sb);
retval = journal_begin(&th, dir->i_sb, jbegin_count);
if (retval)
goto out_unlink;
de.de_gen_number_bit_string = NULL;
if ((retval =
reiserfs_find_entry(dir, dentry->d_name.name, dentry->d_name.len,
&path, &de)) == NAME_NOT_FOUND) {
retval = -ENOENT;
goto end_unlink;
} else if (retval == IO_ERROR) {
retval = -EIO;
goto end_unlink;
}
reiserfs_update_inode_transaction(inode);
reiserfs_update_inode_transaction(dir);
if (de.de_objectid != inode->i_ino) {
// FIXME: compare key of an object and a key found in the
// entry
retval = -EIO;
goto end_unlink;
}
if (!inode->i_nlink) {
reiserfs_warning(inode->i_sb, "reiserfs-7042",
"deleting nonexistent file (%lu), %d",
inode->i_ino, inode->i_nlink);
set_nlink(inode, 1);
}
drop_nlink(inode);
/*
* we schedule before doing the add_save_link call, save the link
* count so we don't race
*/
savelink = inode->i_nlink;
retval =
reiserfs_cut_from_item(&th, &path, &(de.de_entry_key), dir, NULL,
0);
if (retval < 0) {
inc_nlink(inode);
goto end_unlink;
}
inode->i_ctime = CURRENT_TIME_SEC;
reiserfs_update_sd(&th, inode);
dir->i_size -= (de.de_entrylen + DEH_SIZE);
dir->i_ctime = dir->i_mtime = CURRENT_TIME_SEC;
reiserfs_update_sd(&th, dir);
if (!savelink)
/* prevent file from getting lost */
add_save_link(&th, inode, 0 /* not truncate */ );
retval = journal_end(&th, dir->i_sb, jbegin_count);
reiserfs_check_path(&path);
reiserfs_write_unlock_once(dir->i_sb, depth);
return retval;
end_unlink:
pathrelse(&path);
err = journal_end(&th, dir->i_sb, jbegin_count);
reiserfs_check_path(&path);
if (err)
retval = err;
out_unlink:
reiserfs_write_unlock_once(dir->i_sb, depth);
return retval;
}
static int reiserfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
{
int retval;
struct inode *inode;
struct reiserfs_transaction_handle th;
struct reiserfs_security_handle security;
int lock_depth;
/* We need blocks for transaction + (user+group)*(quotas for new inode + update of quota for directory owner) */
int jbegin_count =
JOURNAL_PER_BALANCE_CNT * 3 +
2 * (REISERFS_QUOTA_INIT_BLOCKS(dir->i_sb) +
REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb));
dquot_initialize(dir);
#ifdef DISPLACE_NEW_PACKING_LOCALITIES
/* set flag that new packing locality created and new blocks for the content * of that directory are not displaced yet */
REISERFS_I(dir)->new_packing_locality = 1;
#endif
mode = S_IFDIR | mode;
if (!(inode = new_inode(dir->i_sb))) {
return -ENOMEM;
}
new_inode_init(inode, dir, mode);
jbegin_count += reiserfs_cache_default_acl(dir);
retval = reiserfs_security_init(dir, inode, &dentry->d_name, &security);
if (retval < 0) {
drop_new_inode(inode);
return retval;
}
jbegin_count += retval;
lock_depth = reiserfs_write_lock_once(dir->i_sb);
retval = journal_begin(&th, dir->i_sb, jbegin_count);
if (retval) {
drop_new_inode(inode);
goto out_failed;
}
/* inc the link count now, so another writer doesn't overflow it while
** we sleep later on.
*/
INC_DIR_INODE_NLINK(dir)
retval = reiserfs_new_inode(&th, dir, mode, NULL /*symlink */ ,
old_format_only(dir->i_sb) ?
EMPTY_DIR_SIZE_V1 : EMPTY_DIR_SIZE,
dentry, inode, &security);
if (retval) {
DEC_DIR_INODE_NLINK(dir)
goto out_failed;
}
reiserfs_update_inode_transaction(inode);
reiserfs_update_inode_transaction(dir);
inode->i_op = &reiserfs_dir_inode_operations;
inode->i_fop = &reiserfs_dir_operations;
// note, _this_ add_entry will not update dir's stat data
retval =
reiserfs_add_entry(&th, dir, dentry->d_name.name,
dentry->d_name.len, inode, 1 /*visible */ );
if (retval) {
int err;
clear_nlink(inode);
DEC_DIR_INODE_NLINK(dir);
reiserfs_update_sd(&th, inode);
err = journal_end(&th, dir->i_sb, jbegin_count);
if (err)
retval = err;
unlock_new_inode(inode);
iput(inode);
goto out_failed;
}
// the above add_entry did not update dir's stat data
reiserfs_update_sd(&th, dir);
unlock_new_inode(inode);
d_instantiate(dentry, inode);
retval = journal_end(&th, dir->i_sb, jbegin_count);
out_failed:
reiserfs_write_unlock_once(dir->i_sb, lock_depth);
return retval;
}