/* compose directory item containing "." and ".." entries */
void make_empty_dir_item (char * body, __u32 dirid, __u32 objid,
__u32 par_dirid, __u32 par_objid)
{
struct reiserfs_de_head * deh;
memset (body, 0, EMPTY_DIR_SIZE);
deh = (struct reiserfs_de_head *)body;
/* direntry header of "." */
put_deh_offset( &(deh[0]), DOT_OFFSET );
/* these two are from make_le_item_head, and are are LE */
deh[0].deh_dir_id = dirid;
deh[0].deh_objectid = objid;
deh[0].deh_state = 0; /* Endian safe if 0 */
put_deh_location( &(deh[0]), EMPTY_DIR_SIZE - ROUND_UP( strlen( "." ) ) );
mark_de_visible(&(deh[0]));
/* direntry header of ".." */
put_deh_offset( &(deh[1]), DOT_DOT_OFFSET );
/* key of ".." for the root directory */
/* these two are from the inode, and are are LE */
deh[1].deh_dir_id = par_dirid;
deh[1].deh_objectid = par_objid;
deh[1].deh_state = 0; /* Endian safe if 0 */
put_deh_location( &(deh[1]), deh_location( &(deh[0])) - ROUND_UP( strlen( ".." ) ) );
mark_de_visible(&(deh[1]));
/* copy ".." and "." */
memcpy (body + deh_location( &(deh[0]) ), ".", 1);
memcpy (body + deh_location( &(deh[1]) ), "..", 2);
}
void make_empty_dir_item(char *body, __le32 dirid, __le32 objid,
__le32 par_dirid, __le32 par_objid)
{
struct reiserfs_de_head *deh;
memset(body, 0, EMPTY_DIR_SIZE);
deh = (struct reiserfs_de_head *)body;
put_deh_offset(&(deh[0]), DOT_OFFSET);
deh[0].deh_dir_id = dirid;
deh[0].deh_objectid = objid;
deh[0].deh_state = 0;
put_deh_location(&(deh[0]), EMPTY_DIR_SIZE - ROUND_UP(strlen(".")));
mark_de_visible(&(deh[0]));
put_deh_offset(&(deh[1]), DOT_DOT_OFFSET);
deh[1].deh_dir_id = par_dirid;
deh[1].deh_objectid = par_objid;
deh[1].deh_state = 0;
put_deh_location(&(deh[1]),
deh_location(&(deh[0])) - ROUND_UP(strlen("..")));
mark_de_visible(&(deh[1]));
memcpy(body + deh_location(&(deh[0])), ".", 1);
memcpy(body + deh_location(&(deh[1])), "..", 2);
}
/*
* compose directory item containing "." and ".." entries (entries are
* not aligned to 4 byte boundary)
*/
void make_empty_dir_item_v1(char *body, __le32 dirid, __le32 objid,
__le32 par_dirid, __le32 par_objid)
{
struct reiserfs_de_head *dot, *dotdot;
memset(body, 0, EMPTY_DIR_SIZE_V1);
dot = (struct reiserfs_de_head *)body;
dotdot = dot + 1;
/* direntry header of "." */
put_deh_offset(dot, DOT_OFFSET);
/* these two are from make_le_item_head, and are are LE */
dot->deh_dir_id = dirid;
dot->deh_objectid = objid;
dot->deh_state = 0; /* Endian safe if 0 */
put_deh_location(dot, EMPTY_DIR_SIZE_V1 - strlen("."));
mark_de_visible(dot);
/* direntry header of ".." */
put_deh_offset(dotdot, DOT_DOT_OFFSET);
/* key of ".." for the root directory */
/* these two are from the inode, and are are LE */
dotdot->deh_dir_id = par_dirid;
dotdot->deh_objectid = par_objid;
dotdot->deh_state = 0; /* Endian safe if 0 */
put_deh_location(dotdot, deh_location(dot) - strlen(".."));
mark_de_visible(dotdot);
/* copy ".." and "." */
memcpy(body + deh_location(dot), ".", 1);
memcpy(body + deh_location(dotdot), "..", 2);
}
static int reiserfs_add_entry(struct reiserfs_transaction_handle *th,
struct inode *dir, const char *name, int namelen,
struct inode *inode, int visible)
{
struct cpu_key entry_key;
struct reiserfs_de_head *deh;
INITIALIZE_PATH(path);
struct reiserfs_dir_entry de;
DECLARE_BITMAP(bit_string, MAX_GENERATION_NUMBER + 1);
int gen_number;
char small_buf[32 + DEH_SIZE]; /* 48 bytes now and we avoid kmalloc
if we create file with short name */
char *buffer;
int buflen, paste_size;
int retval;
BUG_ON(!th->t_trans_id);
/* cannot allow items to be added into a busy deleted directory */
if (!namelen)
return -EINVAL;
if (namelen > REISERFS_MAX_NAME(dir->i_sb->s_blocksize))
return -ENAMETOOLONG;
/* each entry has unique key. compose it */
make_cpu_key(&entry_key, dir,
get_third_component(dir->i_sb, name, namelen),
TYPE_DIRENTRY, 3);
/* get memory for composing the entry */
buflen = DEH_SIZE + ROUND_UP(namelen);
if (buflen > sizeof(small_buf)) {
buffer = kmalloc(buflen, GFP_NOFS);
if (!buffer)
return -ENOMEM;
} else
buffer = small_buf;
paste_size =
(get_inode_sd_version(dir) ==
STAT_DATA_V1) ? (DEH_SIZE + namelen) : buflen;
/* fill buffer : directory entry head, name[, dir objectid | , stat data | ,stat data, dir objectid ] */
deh = (struct reiserfs_de_head *)buffer;
deh->deh_location = 0; /* JDM Endian safe if 0 */
put_deh_offset(deh, cpu_key_k_offset(&entry_key));
deh->deh_state = 0; /* JDM Endian safe if 0 */
/* put key (ino analog) to de */
deh->deh_dir_id = INODE_PKEY(inode)->k_dir_id; /* safe: k_dir_id is le */
deh->deh_objectid = INODE_PKEY(inode)->k_objectid; /* safe: k_objectid is le */
/* copy name */
memcpy((char *)(deh + 1), name, namelen);
/* padd by 0s to the 4 byte boundary */
padd_item((char *)(deh + 1), ROUND_UP(namelen), namelen);
/* entry is ready to be pasted into tree, set 'visibility' and 'stat data in entry' attributes */
mark_de_without_sd(deh);
visible ? mark_de_visible(deh) : mark_de_hidden(deh);
/* find the proper place for the new entry */
memset(bit_string, 0, sizeof(bit_string));
de.de_gen_number_bit_string = bit_string;
retval = reiserfs_find_entry(dir, name, namelen, &path, &de);
if (retval != NAME_NOT_FOUND) {
if (buffer != small_buf)
kfree(buffer);
pathrelse(&path);
if (retval == IO_ERROR) {
return -EIO;
}
if (retval != NAME_FOUND) {
reiserfs_error(dir->i_sb, "zam-7002",
"reiserfs_find_entry() returned "
"unexpected value (%d)", retval);
}
return -EEXIST;
}
gen_number =
find_first_zero_bit(bit_string,
MAX_GENERATION_NUMBER + 1);
if (gen_number > MAX_GENERATION_NUMBER) {
/* there is no free generation number */
reiserfs_warning(dir->i_sb, "reiserfs-7010",
"Congratulations! we have got hash function "
"screwed up");
if (buffer != small_buf)
kfree(buffer);
pathrelse(&path);
return -EBUSY;
}
/* adjust offset of directory enrty */
put_deh_offset(deh, SET_GENERATION_NUMBER(deh_offset(deh), gen_number));
set_cpu_key_k_offset(&entry_key, deh_offset(deh));
/* update max-hash-collisions counter in reiserfs_sb_info */
PROC_INFO_MAX(th->t_super, max_hash_collisions, gen_number);
if (gen_number != 0) { /* we need to re-search for the insertion point */
if (search_by_entry_key(dir->i_sb, &entry_key, &path, &de) !=
NAME_NOT_FOUND) {
reiserfs_warning(dir->i_sb, "vs-7032",
"entry with this key (%K) already "
"exists", &entry_key);
if (buffer != small_buf)
kfree(buffer);
pathrelse(&path);
return -EBUSY;
}
}
/* perform the insertion of the entry that we have prepared */
retval =
reiserfs_paste_into_item(th, &path, &entry_key, dir, buffer,
paste_size);
if (buffer != small_buf)
kfree(buffer);
if (retval) {
reiserfs_check_path(&path);
return retval;
}
dir->i_size += paste_size;
dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
if (!S_ISDIR(inode->i_mode) && visible)
// reiserfs_mkdir or reiserfs_rename will do that by itself
reiserfs_update_sd(th, dir);
reiserfs_check_path(&path);
return 0;
}
