static int reiserfs_find_entry (struct inode * dir, const char * name, int namelen, struct path * path_to_entry, struct reiserfs_dir_entry * de)
{
struct key key_to_search;
int repeat;
int retval;
if (!dir || !dir->i_sb)
return POSITION_NOT_FOUND;
if ((unsigned int)namelen > REISERFS_MAX_NAME_LEN (dir->i_sb->s_blocksize))
return POSITION_NOT_FOUND;
/* there are no entries having the same third component of key, so
fourth key component is not used */
copy_key (&key_to_search, INODE_PKEY (dir));
key_to_search.k_offset = get_third_component (name, namelen);
key_to_search.k_uniqueness = DIRENTRY_UNIQUENESS;
while (1) {
/* search for a directory item using the formed key */
if (search_by_key (dir->i_sb, &key_to_search, path_to_entry, &repeat, DISK_LEAF_NODE_LEVEL, READ_BLOCKS) == ITEM_NOT_FOUND) {
/* take previous item */
#ifdef REISERFS_CHECK
if (!PATH_LAST_POSITION (path_to_entry))
reiserfs_panic (dir->i_sb, "vs-7010: reiserfs_find_entry: search_by_key returned bad position == 0");
#endif /* REISERFS_CHECK */
PATH_LAST_POSITION (path_to_entry) --;
}
de->de_bh = PATH_PLAST_BUFFER (path_to_entry);
de->de_item_num = PATH_LAST_POSITION (path_to_entry);
de->de_ih = B_N_PITEM_HEAD (de->de_bh, de->de_item_num);
de->de_deh = B_I_DEH (de->de_bh, de->de_ih);
#ifdef REISERFS_CHECK
if (!I_IS_DIRECTORY_ITEM (de->de_ih) || COMP_SHORT_KEYS (&(de->de_ih->ih_key), INODE_PKEY (dir)))
reiserfs_panic (dir->i_sb, "vs-7020: reiserfs_find_entry: item must be an item of the same directory item as inode");
#endif /* REISERFS_CHECK */
/* we do not check whether bin_search_in_dir_item found the given key, even if so, we still have
to compare names */
bin_search_in_dir_item (de->de_ih, de->de_deh, &key_to_search, &(de->de_entry_num));
/* compare names for all entries having given hash value */
retval = linear_search_in_dir_item (&key_to_search, de, name, namelen);
if (retval != GOTO_PREVIOUS_ITEM)
/* there is no need to scan directory anymore. Given entry found or does not exist */
return retval;
/* there is left neighboring item of this directory and given entry can be there */
key_to_search.k_offset = de->de_ih->ih_key.k_offset - 1;
pathrelse (path_to_entry);
} /* while (1) */
}
/*
* May return NAME_FOUND, NAME_FOUND_INVISIBLE, NAME_NOT_FOUND
* FIXME: should add something like IOERROR
*/
static int
reiserfs_find_entry(struct reiserfs_node *dp, const char *name, int namelen,
struct path * path_to_entry, struct reiserfs_dir_entry *de)
{
struct cpu_key key_to_search;
int retval;
if (namelen > REISERFS_MAX_NAME(dp->i_reiserfs->s_blocksize))
return NAME_NOT_FOUND;
/* We will search for this key in the tree */
make_cpu_key(&key_to_search, dp,
get_third_component(dp->i_reiserfs, name, namelen),
TYPE_DIRENTRY, 3);
while (1) {
reiserfs_log(LOG_DEBUG, "search by entry key\n");
retval = search_by_entry_key(dp->i_reiserfs, &key_to_search,
path_to_entry, de);
if (retval == IO_ERROR) {
reiserfs_log(LOG_DEBUG, "IO error in %s\n",
__FUNCTION__);
return IO_ERROR;
}
/* Compare names for all entries having given hash value */
reiserfs_log(LOG_DEBUG, "linear search for `%s'\n", name);
retval = linear_search_in_dir_item(&key_to_search, de,
name, namelen);
if (retval != GOTO_PREVIOUS_ITEM) {
/*
* There is no need to scan directory anymore.
* Given entry found or does not exist
*/
reiserfs_log(LOG_DEBUG, "linear search returned "
"(objectid=%d,dirid=%d)\n",
de->de_objectid, de->de_dir_id);
path_to_entry->pos_in_item = de->de_entry_num;
return retval;
}
/*
* There is left neighboring item of this directory and
* given entry can be there
*/
set_cpu_key_k_offset(&key_to_search,
le_ih_k_offset(de->de_ih) - 1);
pathrelse(path_to_entry);
} /* while (1) */
}
/*
* may return NAME_FOUND, NAME_FOUND_INVISIBLE, NAME_NOT_FOUND
* FIXME: should add something like IOERROR
*/
static int reiserfs_find_entry(struct inode *dir, const char *name, int namelen,
struct treepath *path_to_entry,
struct reiserfs_dir_entry *de)
{
struct cpu_key key_to_search;
int retval;
if (namelen > REISERFS_MAX_NAME(dir->i_sb->s_blocksize))
return NAME_NOT_FOUND;
/* we will search for this key in the tree */
make_cpu_key(&key_to_search, dir,
get_third_component(dir->i_sb, name, namelen),
TYPE_DIRENTRY, 3);
while (1) {
retval =
search_by_entry_key(dir->i_sb, &key_to_search,
path_to_entry, de);
if (retval == IO_ERROR) {
reiserfs_error(dir->i_sb, "zam-7001", "io error");
return IO_ERROR;
}
/* compare names for all entries having given hash value */
retval =
linear_search_in_dir_item(&key_to_search, de, name,
namelen);
/*
* there is no need to scan directory anymore.
* Given entry found or does not exist
*/
if (retval != GOTO_PREVIOUS_ITEM) {
path_to_entry->pos_in_item = de->de_entry_num;
return retval;
}
/*
* there is left neighboring item of this directory
* and given entry can be there
*/
set_cpu_key_k_offset(&key_to_search,
le_ih_k_offset(de->de_ih) - 1);
pathrelse(path_to_entry);
} /* while (1) */
}
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;
}
/* add entry to the directory (entry can be hidden). Does not mark dir
inode dirty, do it after successesfull call to it */
static int reiserfs_add_entry (struct reiserfs_transaction_handle *th, struct inode * dir,
const char * name, int namelen, struct key * object_key, struct reiserfs_dir_entry * de,
int visible
)
{
struct key entry_key;
char * buffer;
int buflen;
struct reiserfs_de_head * deh;
struct path path;
char bit_string [MAX_GEN_NUMBER / 8 + 1];
int gen_number;
int repeat;
#ifdef REISERFS_ALIGNED
int aligned_namelen = (namelen+3) & ~3;
#endif
init_path (&path);
if (!dir || !dir->i_sb)
return -ENOENT;
if ((unsigned int)namelen > REISERFS_MAX_NAME_LEN (dir->i_sb->s_blocksize))
return -ENAMETOOLONG;
/* each entry has unique key. compose it */
copy_key (&entry_key, INODE_PKEY(dir));
entry_key.k_offset = get_third_component (name, namelen);
entry_key.k_uniqueness = DIRENTRY_UNIQUENESS;
/* get memory for composing the entry */
#ifdef REISERFS_ALIGNED
buflen = DEH_SIZE + aligned_namelen;
#else
buflen = DEH_SIZE + namelen;
#endif
buffer = reiserfs_kmalloc (buflen, GFP_KERNEL, dir->i_sb);
if (buffer == 0)
return -ENOMEM;
/* fill buffer : directory entry head, name[, dir objectid | , stat data | ,stat data, dir objectid ] */
deh = (struct reiserfs_de_head *)buffer;
deh->deh_location = 0;
deh->deh_offset = entry_key.k_offset;
deh->deh_state = 0;
/* put key (ino analog) to de */
deh->deh_dir_id = object_key->k_dir_id;
deh->deh_objectid = object_key->k_objectid;
/* copy name */
#ifdef REISERFS_ALIGNED
memset( (char*)(deh+1), '\0', aligned_namelen );
#endif
memcpy ((char *)(deh + 1), name, 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;
if (reiserfs_find_entry (dir, name, namelen, &path, de) == POSITION_FOUND) {
reiserfs_panic (dir->i_sb, "vs-7030: reiserfs_add_entry: entry with this key %k already exists",
&entry_key);
}
if (find_first_nonzero_bit (bit_string, MAX_GEN_NUMBER + 1) < MAX_GEN_NUMBER + 1) {
/* there are few names with given hash value */
gen_number = find_first_zero_bit (bit_string, MAX_GEN_NUMBER + 1);
if (gen_number > MAX_GEN_NUMBER) {
/* there is no free generation number */
reiserfs_kfree (buffer, buflen, dir->i_sb);
pathrelse (&path);
return -EHASHCOLLISION;
}
/* adjust offset of directory enrty */
deh->deh_offset = SET_GENERATION_NUMBER (deh->deh_offset, gen_number);
entry_key.k_offset = deh->deh_offset;
/* find place for new entry */
if (search_by_entry_key (dir->i_sb, &entry_key, &path, &(de->de_entry_num), &repeat)) {
reiserfs_panic (dir->i_sb, "reiserfs_add_entry: 7032: entry with this key (%k) already exists", &entry_key);
}
} else {
deh->deh_offset = SET_GENERATION_NUMBER (deh->deh_offset, 0);
entry_key.k_offset = deh->deh_offset;
}
/* perform the insertion of the entry that we have prepared */
if (reiserfs_paste_into_item (th, dir->i_sb, &path, &(de->de_entry_num), &entry_key, buffer,
buflen, REISERFS_KERNEL_MEM, 0) == -1) {
reiserfs_kfree (buffer, buflen, dir->i_sb);
return -ENOSPC;
}
reiserfs_kfree (buffer, buflen, dir->i_sb);
dir->i_size += buflen;
dir->i_mtime = dir->i_ctime = CURRENT_TIME;
return 0;
}
