mirror of https://gitee.com/openkylin/linux.git
886 lines
21 KiB
C
886 lines
21 KiB
C
/*
|
|
* fs/f2fs/dir.c
|
|
*
|
|
* Copyright (c) 2012 Samsung Electronics Co., Ltd.
|
|
* http://www.samsung.com/
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
#include <linux/fs.h>
|
|
#include <linux/f2fs_fs.h>
|
|
#include "f2fs.h"
|
|
#include "node.h"
|
|
#include "acl.h"
|
|
#include "xattr.h"
|
|
|
|
static unsigned long dir_blocks(struct inode *inode)
|
|
{
|
|
return ((unsigned long long) (i_size_read(inode) + PAGE_CACHE_SIZE - 1))
|
|
>> PAGE_CACHE_SHIFT;
|
|
}
|
|
|
|
static unsigned int dir_buckets(unsigned int level, int dir_level)
|
|
{
|
|
if (level + dir_level < MAX_DIR_HASH_DEPTH / 2)
|
|
return 1 << (level + dir_level);
|
|
else
|
|
return MAX_DIR_BUCKETS;
|
|
}
|
|
|
|
static unsigned int bucket_blocks(unsigned int level)
|
|
{
|
|
if (level < MAX_DIR_HASH_DEPTH / 2)
|
|
return 2;
|
|
else
|
|
return 4;
|
|
}
|
|
|
|
unsigned char f2fs_filetype_table[F2FS_FT_MAX] = {
|
|
[F2FS_FT_UNKNOWN] = DT_UNKNOWN,
|
|
[F2FS_FT_REG_FILE] = DT_REG,
|
|
[F2FS_FT_DIR] = DT_DIR,
|
|
[F2FS_FT_CHRDEV] = DT_CHR,
|
|
[F2FS_FT_BLKDEV] = DT_BLK,
|
|
[F2FS_FT_FIFO] = DT_FIFO,
|
|
[F2FS_FT_SOCK] = DT_SOCK,
|
|
[F2FS_FT_SYMLINK] = DT_LNK,
|
|
};
|
|
|
|
#define S_SHIFT 12
|
|
static unsigned char f2fs_type_by_mode[S_IFMT >> S_SHIFT] = {
|
|
[S_IFREG >> S_SHIFT] = F2FS_FT_REG_FILE,
|
|
[S_IFDIR >> S_SHIFT] = F2FS_FT_DIR,
|
|
[S_IFCHR >> S_SHIFT] = F2FS_FT_CHRDEV,
|
|
[S_IFBLK >> S_SHIFT] = F2FS_FT_BLKDEV,
|
|
[S_IFIFO >> S_SHIFT] = F2FS_FT_FIFO,
|
|
[S_IFSOCK >> S_SHIFT] = F2FS_FT_SOCK,
|
|
[S_IFLNK >> S_SHIFT] = F2FS_FT_SYMLINK,
|
|
};
|
|
|
|
void set_de_type(struct f2fs_dir_entry *de, umode_t mode)
|
|
{
|
|
de->file_type = f2fs_type_by_mode[(mode & S_IFMT) >> S_SHIFT];
|
|
}
|
|
|
|
static unsigned long dir_block_index(unsigned int level,
|
|
int dir_level, unsigned int idx)
|
|
{
|
|
unsigned long i;
|
|
unsigned long bidx = 0;
|
|
|
|
for (i = 0; i < level; i++)
|
|
bidx += dir_buckets(i, dir_level) * bucket_blocks(i);
|
|
bidx += idx * bucket_blocks(level);
|
|
return bidx;
|
|
}
|
|
|
|
static struct f2fs_dir_entry *find_in_block(struct page *dentry_page,
|
|
struct f2fs_filename *fname,
|
|
f2fs_hash_t namehash,
|
|
int *max_slots,
|
|
struct page **res_page)
|
|
{
|
|
struct f2fs_dentry_block *dentry_blk;
|
|
struct f2fs_dir_entry *de;
|
|
struct f2fs_dentry_ptr d;
|
|
|
|
dentry_blk = (struct f2fs_dentry_block *)kmap(dentry_page);
|
|
|
|
make_dentry_ptr(NULL, &d, (void *)dentry_blk, 1);
|
|
de = find_target_dentry(fname, namehash, max_slots, &d);
|
|
if (de)
|
|
*res_page = dentry_page;
|
|
else
|
|
kunmap(dentry_page);
|
|
|
|
/*
|
|
* For the most part, it should be a bug when name_len is zero.
|
|
* We stop here for figuring out where the bugs has occurred.
|
|
*/
|
|
f2fs_bug_on(F2FS_P_SB(dentry_page), d.max < 0);
|
|
return de;
|
|
}
|
|
|
|
struct f2fs_dir_entry *find_target_dentry(struct f2fs_filename *fname,
|
|
f2fs_hash_t namehash, int *max_slots,
|
|
struct f2fs_dentry_ptr *d)
|
|
{
|
|
struct f2fs_dir_entry *de;
|
|
unsigned long bit_pos = 0;
|
|
int max_len = 0;
|
|
struct f2fs_str de_name = FSTR_INIT(NULL, 0);
|
|
struct f2fs_str *name = &fname->disk_name;
|
|
|
|
if (max_slots)
|
|
*max_slots = 0;
|
|
while (bit_pos < d->max) {
|
|
if (!test_bit_le(bit_pos, d->bitmap)) {
|
|
bit_pos++;
|
|
max_len++;
|
|
continue;
|
|
}
|
|
|
|
de = &d->dentry[bit_pos];
|
|
|
|
/* encrypted case */
|
|
de_name.name = d->filename[bit_pos];
|
|
de_name.len = le16_to_cpu(de->name_len);
|
|
|
|
/* show encrypted name */
|
|
if (fname->hash) {
|
|
if (de->hash_code == fname->hash)
|
|
goto found;
|
|
} else if (de_name.len == name->len &&
|
|
de->hash_code == namehash &&
|
|
!memcmp(de_name.name, name->name, name->len))
|
|
goto found;
|
|
|
|
if (max_slots && max_len > *max_slots)
|
|
*max_slots = max_len;
|
|
max_len = 0;
|
|
|
|
/* remain bug on condition */
|
|
if (unlikely(!de->name_len))
|
|
d->max = -1;
|
|
|
|
bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
|
|
}
|
|
|
|
de = NULL;
|
|
found:
|
|
if (max_slots && max_len > *max_slots)
|
|
*max_slots = max_len;
|
|
return de;
|
|
}
|
|
|
|
static struct f2fs_dir_entry *find_in_level(struct inode *dir,
|
|
unsigned int level,
|
|
struct f2fs_filename *fname,
|
|
struct page **res_page)
|
|
{
|
|
struct qstr name = FSTR_TO_QSTR(&fname->disk_name);
|
|
int s = GET_DENTRY_SLOTS(name.len);
|
|
unsigned int nbucket, nblock;
|
|
unsigned int bidx, end_block;
|
|
struct page *dentry_page;
|
|
struct f2fs_dir_entry *de = NULL;
|
|
bool room = false;
|
|
int max_slots;
|
|
f2fs_hash_t namehash;
|
|
|
|
namehash = f2fs_dentry_hash(&name);
|
|
|
|
f2fs_bug_on(F2FS_I_SB(dir), level > MAX_DIR_HASH_DEPTH);
|
|
|
|
nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level);
|
|
nblock = bucket_blocks(level);
|
|
|
|
bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level,
|
|
le32_to_cpu(namehash) % nbucket);
|
|
end_block = bidx + nblock;
|
|
|
|
for (; bidx < end_block; bidx++) {
|
|
/* no need to allocate new dentry pages to all the indices */
|
|
dentry_page = find_data_page(dir, bidx);
|
|
if (IS_ERR(dentry_page)) {
|
|
room = true;
|
|
continue;
|
|
}
|
|
|
|
de = find_in_block(dentry_page, fname, namehash, &max_slots,
|
|
res_page);
|
|
if (de)
|
|
break;
|
|
|
|
if (max_slots >= s)
|
|
room = true;
|
|
f2fs_put_page(dentry_page, 0);
|
|
}
|
|
|
|
if (!de && room && F2FS_I(dir)->chash != namehash) {
|
|
F2FS_I(dir)->chash = namehash;
|
|
F2FS_I(dir)->clevel = level;
|
|
}
|
|
|
|
return de;
|
|
}
|
|
|
|
/*
|
|
* Find an entry in the specified directory with the wanted name.
|
|
* It returns the page where the entry was found (as a parameter - res_page),
|
|
* and the entry itself. Page is returned mapped and unlocked.
|
|
* Entry is guaranteed to be valid.
|
|
*/
|
|
struct f2fs_dir_entry *f2fs_find_entry(struct inode *dir,
|
|
struct qstr *child, struct page **res_page)
|
|
{
|
|
unsigned long npages = dir_blocks(dir);
|
|
struct f2fs_dir_entry *de = NULL;
|
|
unsigned int max_depth;
|
|
unsigned int level;
|
|
struct f2fs_filename fname;
|
|
int err;
|
|
|
|
*res_page = NULL;
|
|
|
|
err = f2fs_fname_setup_filename(dir, child, 1, &fname);
|
|
if (err)
|
|
return NULL;
|
|
|
|
if (f2fs_has_inline_dentry(dir)) {
|
|
de = find_in_inline_dir(dir, &fname, res_page);
|
|
goto out;
|
|
}
|
|
|
|
if (npages == 0)
|
|
goto out;
|
|
|
|
max_depth = F2FS_I(dir)->i_current_depth;
|
|
|
|
for (level = 0; level < max_depth; level++) {
|
|
de = find_in_level(dir, level, &fname, res_page);
|
|
if (de)
|
|
break;
|
|
}
|
|
out:
|
|
f2fs_fname_free_filename(&fname);
|
|
return de;
|
|
}
|
|
|
|
struct f2fs_dir_entry *f2fs_parent_dir(struct inode *dir, struct page **p)
|
|
{
|
|
struct page *page;
|
|
struct f2fs_dir_entry *de;
|
|
struct f2fs_dentry_block *dentry_blk;
|
|
|
|
if (f2fs_has_inline_dentry(dir))
|
|
return f2fs_parent_inline_dir(dir, p);
|
|
|
|
page = get_lock_data_page(dir, 0);
|
|
if (IS_ERR(page))
|
|
return NULL;
|
|
|
|
dentry_blk = kmap(page);
|
|
de = &dentry_blk->dentry[1];
|
|
*p = page;
|
|
unlock_page(page);
|
|
return de;
|
|
}
|
|
|
|
ino_t f2fs_inode_by_name(struct inode *dir, struct qstr *qstr)
|
|
{
|
|
ino_t res = 0;
|
|
struct f2fs_dir_entry *de;
|
|
struct page *page;
|
|
|
|
de = f2fs_find_entry(dir, qstr, &page);
|
|
if (de) {
|
|
res = le32_to_cpu(de->ino);
|
|
f2fs_dentry_kunmap(dir, page);
|
|
f2fs_put_page(page, 0);
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
void f2fs_set_link(struct inode *dir, struct f2fs_dir_entry *de,
|
|
struct page *page, struct inode *inode)
|
|
{
|
|
enum page_type type = f2fs_has_inline_dentry(dir) ? NODE : DATA;
|
|
lock_page(page);
|
|
f2fs_wait_on_page_writeback(page, type);
|
|
de->ino = cpu_to_le32(inode->i_ino);
|
|
set_de_type(de, inode->i_mode);
|
|
f2fs_dentry_kunmap(dir, page);
|
|
set_page_dirty(page);
|
|
dir->i_mtime = dir->i_ctime = CURRENT_TIME;
|
|
mark_inode_dirty(dir);
|
|
|
|
f2fs_put_page(page, 1);
|
|
}
|
|
|
|
static void init_dent_inode(const struct qstr *name, struct page *ipage)
|
|
{
|
|
struct f2fs_inode *ri;
|
|
|
|
f2fs_wait_on_page_writeback(ipage, NODE);
|
|
|
|
/* copy name info. to this inode page */
|
|
ri = F2FS_INODE(ipage);
|
|
ri->i_namelen = cpu_to_le32(name->len);
|
|
memcpy(ri->i_name, name->name, name->len);
|
|
set_page_dirty(ipage);
|
|
}
|
|
|
|
int update_dent_inode(struct inode *inode, struct inode *to,
|
|
const struct qstr *name)
|
|
{
|
|
struct page *page;
|
|
|
|
if (file_enc_name(to))
|
|
return 0;
|
|
|
|
page = get_node_page(F2FS_I_SB(inode), inode->i_ino);
|
|
if (IS_ERR(page))
|
|
return PTR_ERR(page);
|
|
|
|
init_dent_inode(name, page);
|
|
f2fs_put_page(page, 1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void do_make_empty_dir(struct inode *inode, struct inode *parent,
|
|
struct f2fs_dentry_ptr *d)
|
|
{
|
|
struct f2fs_dir_entry *de;
|
|
|
|
de = &d->dentry[0];
|
|
de->name_len = cpu_to_le16(1);
|
|
de->hash_code = 0;
|
|
de->ino = cpu_to_le32(inode->i_ino);
|
|
memcpy(d->filename[0], ".", 1);
|
|
set_de_type(de, inode->i_mode);
|
|
|
|
de = &d->dentry[1];
|
|
de->hash_code = 0;
|
|
de->name_len = cpu_to_le16(2);
|
|
de->ino = cpu_to_le32(parent->i_ino);
|
|
memcpy(d->filename[1], "..", 2);
|
|
set_de_type(de, parent->i_mode);
|
|
|
|
test_and_set_bit_le(0, (void *)d->bitmap);
|
|
test_and_set_bit_le(1, (void *)d->bitmap);
|
|
}
|
|
|
|
static int make_empty_dir(struct inode *inode,
|
|
struct inode *parent, struct page *page)
|
|
{
|
|
struct page *dentry_page;
|
|
struct f2fs_dentry_block *dentry_blk;
|
|
struct f2fs_dentry_ptr d;
|
|
|
|
if (f2fs_has_inline_dentry(inode))
|
|
return make_empty_inline_dir(inode, parent, page);
|
|
|
|
dentry_page = get_new_data_page(inode, page, 0, true);
|
|
if (IS_ERR(dentry_page))
|
|
return PTR_ERR(dentry_page);
|
|
|
|
dentry_blk = kmap_atomic(dentry_page);
|
|
|
|
make_dentry_ptr(NULL, &d, (void *)dentry_blk, 1);
|
|
do_make_empty_dir(inode, parent, &d);
|
|
|
|
kunmap_atomic(dentry_blk);
|
|
|
|
set_page_dirty(dentry_page);
|
|
f2fs_put_page(dentry_page, 1);
|
|
return 0;
|
|
}
|
|
|
|
struct page *init_inode_metadata(struct inode *inode, struct inode *dir,
|
|
const struct qstr *name, struct page *dpage)
|
|
{
|
|
struct page *page;
|
|
int err;
|
|
|
|
if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) {
|
|
page = new_inode_page(inode);
|
|
if (IS_ERR(page))
|
|
return page;
|
|
|
|
if (S_ISDIR(inode->i_mode)) {
|
|
err = make_empty_dir(inode, dir, page);
|
|
if (err)
|
|
goto error;
|
|
}
|
|
|
|
err = f2fs_init_acl(inode, dir, page, dpage);
|
|
if (err)
|
|
goto put_error;
|
|
|
|
err = f2fs_init_security(inode, dir, name, page);
|
|
if (err)
|
|
goto put_error;
|
|
|
|
if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode)) {
|
|
err = f2fs_inherit_context(dir, inode, page);
|
|
if (err)
|
|
goto put_error;
|
|
}
|
|
} else {
|
|
page = get_node_page(F2FS_I_SB(dir), inode->i_ino);
|
|
if (IS_ERR(page))
|
|
return page;
|
|
|
|
set_cold_node(inode, page);
|
|
}
|
|
|
|
if (name)
|
|
init_dent_inode(name, page);
|
|
|
|
/*
|
|
* This file should be checkpointed during fsync.
|
|
* We lost i_pino from now on.
|
|
*/
|
|
if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK)) {
|
|
file_lost_pino(inode);
|
|
/*
|
|
* If link the tmpfile to alias through linkat path,
|
|
* we should remove this inode from orphan list.
|
|
*/
|
|
if (inode->i_nlink == 0)
|
|
remove_orphan_inode(F2FS_I_SB(dir), inode->i_ino);
|
|
inc_nlink(inode);
|
|
}
|
|
return page;
|
|
|
|
put_error:
|
|
f2fs_put_page(page, 1);
|
|
error:
|
|
/* once the failed inode becomes a bad inode, i_mode is S_IFREG */
|
|
truncate_inode_pages(&inode->i_data, 0);
|
|
truncate_blocks(inode, 0, false);
|
|
remove_dirty_dir_inode(inode);
|
|
remove_inode_page(inode);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
void update_parent_metadata(struct inode *dir, struct inode *inode,
|
|
unsigned int current_depth)
|
|
{
|
|
if (inode && is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) {
|
|
if (S_ISDIR(inode->i_mode)) {
|
|
inc_nlink(dir);
|
|
set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
|
|
}
|
|
clear_inode_flag(F2FS_I(inode), FI_NEW_INODE);
|
|
}
|
|
dir->i_mtime = dir->i_ctime = CURRENT_TIME;
|
|
mark_inode_dirty(dir);
|
|
|
|
if (F2FS_I(dir)->i_current_depth != current_depth) {
|
|
F2FS_I(dir)->i_current_depth = current_depth;
|
|
set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
|
|
}
|
|
|
|
if (inode && is_inode_flag_set(F2FS_I(inode), FI_INC_LINK))
|
|
clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
|
|
}
|
|
|
|
int room_for_filename(const void *bitmap, int slots, int max_slots)
|
|
{
|
|
int bit_start = 0;
|
|
int zero_start, zero_end;
|
|
next:
|
|
zero_start = find_next_zero_bit_le(bitmap, max_slots, bit_start);
|
|
if (zero_start >= max_slots)
|
|
return max_slots;
|
|
|
|
zero_end = find_next_bit_le(bitmap, max_slots, zero_start);
|
|
if (zero_end - zero_start >= slots)
|
|
return zero_start;
|
|
|
|
bit_start = zero_end + 1;
|
|
|
|
if (zero_end + 1 >= max_slots)
|
|
return max_slots;
|
|
goto next;
|
|
}
|
|
|
|
void f2fs_update_dentry(nid_t ino, umode_t mode, struct f2fs_dentry_ptr *d,
|
|
const struct qstr *name, f2fs_hash_t name_hash,
|
|
unsigned int bit_pos)
|
|
{
|
|
struct f2fs_dir_entry *de;
|
|
int slots = GET_DENTRY_SLOTS(name->len);
|
|
int i;
|
|
|
|
de = &d->dentry[bit_pos];
|
|
de->hash_code = name_hash;
|
|
de->name_len = cpu_to_le16(name->len);
|
|
memcpy(d->filename[bit_pos], name->name, name->len);
|
|
de->ino = cpu_to_le32(ino);
|
|
set_de_type(de, mode);
|
|
for (i = 0; i < slots; i++)
|
|
test_and_set_bit_le(bit_pos + i, (void *)d->bitmap);
|
|
}
|
|
|
|
/*
|
|
* Caller should grab and release a rwsem by calling f2fs_lock_op() and
|
|
* f2fs_unlock_op().
|
|
*/
|
|
int __f2fs_add_link(struct inode *dir, const struct qstr *name,
|
|
struct inode *inode, nid_t ino, umode_t mode)
|
|
{
|
|
unsigned int bit_pos;
|
|
unsigned int level;
|
|
unsigned int current_depth;
|
|
unsigned long bidx, block;
|
|
f2fs_hash_t dentry_hash;
|
|
unsigned int nbucket, nblock;
|
|
struct page *dentry_page = NULL;
|
|
struct f2fs_dentry_block *dentry_blk = NULL;
|
|
struct f2fs_dentry_ptr d;
|
|
struct page *page = NULL;
|
|
struct f2fs_filename fname;
|
|
struct qstr new_name;
|
|
int slots, err;
|
|
|
|
err = f2fs_fname_setup_filename(dir, name, 0, &fname);
|
|
if (err)
|
|
return err;
|
|
|
|
new_name.name = fname_name(&fname);
|
|
new_name.len = fname_len(&fname);
|
|
|
|
if (f2fs_has_inline_dentry(dir)) {
|
|
err = f2fs_add_inline_entry(dir, &new_name, inode, ino, mode);
|
|
if (!err || err != -EAGAIN)
|
|
goto out;
|
|
else
|
|
err = 0;
|
|
}
|
|
|
|
level = 0;
|
|
slots = GET_DENTRY_SLOTS(new_name.len);
|
|
dentry_hash = f2fs_dentry_hash(&new_name);
|
|
|
|
current_depth = F2FS_I(dir)->i_current_depth;
|
|
if (F2FS_I(dir)->chash == dentry_hash) {
|
|
level = F2FS_I(dir)->clevel;
|
|
F2FS_I(dir)->chash = 0;
|
|
}
|
|
|
|
start:
|
|
if (unlikely(current_depth == MAX_DIR_HASH_DEPTH)) {
|
|
err = -ENOSPC;
|
|
goto out;
|
|
}
|
|
|
|
/* Increase the depth, if required */
|
|
if (level == current_depth)
|
|
++current_depth;
|
|
|
|
nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level);
|
|
nblock = bucket_blocks(level);
|
|
|
|
bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level,
|
|
(le32_to_cpu(dentry_hash) % nbucket));
|
|
|
|
for (block = bidx; block <= (bidx + nblock - 1); block++) {
|
|
dentry_page = get_new_data_page(dir, NULL, block, true);
|
|
if (IS_ERR(dentry_page)) {
|
|
err = PTR_ERR(dentry_page);
|
|
goto out;
|
|
}
|
|
|
|
dentry_blk = kmap(dentry_page);
|
|
bit_pos = room_for_filename(&dentry_blk->dentry_bitmap,
|
|
slots, NR_DENTRY_IN_BLOCK);
|
|
if (bit_pos < NR_DENTRY_IN_BLOCK)
|
|
goto add_dentry;
|
|
|
|
kunmap(dentry_page);
|
|
f2fs_put_page(dentry_page, 1);
|
|
}
|
|
|
|
/* Move to next level to find the empty slot for new dentry */
|
|
++level;
|
|
goto start;
|
|
add_dentry:
|
|
f2fs_wait_on_page_writeback(dentry_page, DATA);
|
|
|
|
if (inode) {
|
|
down_write(&F2FS_I(inode)->i_sem);
|
|
page = init_inode_metadata(inode, dir, &new_name, NULL);
|
|
if (IS_ERR(page)) {
|
|
err = PTR_ERR(page);
|
|
goto fail;
|
|
}
|
|
if (f2fs_encrypted_inode(dir))
|
|
file_set_enc_name(inode);
|
|
}
|
|
|
|
make_dentry_ptr(NULL, &d, (void *)dentry_blk, 1);
|
|
f2fs_update_dentry(ino, mode, &d, &new_name, dentry_hash, bit_pos);
|
|
|
|
set_page_dirty(dentry_page);
|
|
|
|
if (inode) {
|
|
/* we don't need to mark_inode_dirty now */
|
|
F2FS_I(inode)->i_pino = dir->i_ino;
|
|
update_inode(inode, page);
|
|
f2fs_put_page(page, 1);
|
|
}
|
|
|
|
update_parent_metadata(dir, inode, current_depth);
|
|
fail:
|
|
if (inode)
|
|
up_write(&F2FS_I(inode)->i_sem);
|
|
|
|
if (is_inode_flag_set(F2FS_I(dir), FI_UPDATE_DIR)) {
|
|
update_inode_page(dir);
|
|
clear_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
|
|
}
|
|
kunmap(dentry_page);
|
|
f2fs_put_page(dentry_page, 1);
|
|
out:
|
|
f2fs_fname_free_filename(&fname);
|
|
return err;
|
|
}
|
|
|
|
int f2fs_do_tmpfile(struct inode *inode, struct inode *dir)
|
|
{
|
|
struct page *page;
|
|
int err = 0;
|
|
|
|
down_write(&F2FS_I(inode)->i_sem);
|
|
page = init_inode_metadata(inode, dir, NULL, NULL);
|
|
if (IS_ERR(page)) {
|
|
err = PTR_ERR(page);
|
|
goto fail;
|
|
}
|
|
/* we don't need to mark_inode_dirty now */
|
|
update_inode(inode, page);
|
|
f2fs_put_page(page, 1);
|
|
|
|
clear_inode_flag(F2FS_I(inode), FI_NEW_INODE);
|
|
fail:
|
|
up_write(&F2FS_I(inode)->i_sem);
|
|
return err;
|
|
}
|
|
|
|
void f2fs_drop_nlink(struct inode *dir, struct inode *inode, struct page *page)
|
|
{
|
|
struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
|
|
|
|
down_write(&F2FS_I(inode)->i_sem);
|
|
|
|
if (S_ISDIR(inode->i_mode)) {
|
|
drop_nlink(dir);
|
|
if (page)
|
|
update_inode(dir, page);
|
|
else
|
|
update_inode_page(dir);
|
|
}
|
|
inode->i_ctime = CURRENT_TIME;
|
|
|
|
drop_nlink(inode);
|
|
if (S_ISDIR(inode->i_mode)) {
|
|
drop_nlink(inode);
|
|
i_size_write(inode, 0);
|
|
}
|
|
up_write(&F2FS_I(inode)->i_sem);
|
|
update_inode_page(inode);
|
|
|
|
if (inode->i_nlink == 0)
|
|
add_orphan_inode(sbi, inode->i_ino);
|
|
else
|
|
release_orphan_inode(sbi);
|
|
}
|
|
|
|
/*
|
|
* It only removes the dentry from the dentry page, corresponding name
|
|
* entry in name page does not need to be touched during deletion.
|
|
*/
|
|
void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page,
|
|
struct inode *dir, struct inode *inode)
|
|
{
|
|
struct f2fs_dentry_block *dentry_blk;
|
|
unsigned int bit_pos;
|
|
int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
|
|
int i;
|
|
|
|
if (f2fs_has_inline_dentry(dir))
|
|
return f2fs_delete_inline_entry(dentry, page, dir, inode);
|
|
|
|
lock_page(page);
|
|
f2fs_wait_on_page_writeback(page, DATA);
|
|
|
|
dentry_blk = page_address(page);
|
|
bit_pos = dentry - dentry_blk->dentry;
|
|
for (i = 0; i < slots; i++)
|
|
clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
|
|
|
|
/* Let's check and deallocate this dentry page */
|
|
bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
|
|
NR_DENTRY_IN_BLOCK,
|
|
0);
|
|
kunmap(page); /* kunmap - pair of f2fs_find_entry */
|
|
set_page_dirty(page);
|
|
|
|
dir->i_ctime = dir->i_mtime = CURRENT_TIME;
|
|
|
|
if (inode)
|
|
f2fs_drop_nlink(dir, inode, NULL);
|
|
|
|
if (bit_pos == NR_DENTRY_IN_BLOCK) {
|
|
truncate_hole(dir, page->index, page->index + 1);
|
|
clear_page_dirty_for_io(page);
|
|
ClearPagePrivate(page);
|
|
ClearPageUptodate(page);
|
|
inode_dec_dirty_pages(dir);
|
|
}
|
|
f2fs_put_page(page, 1);
|
|
}
|
|
|
|
bool f2fs_empty_dir(struct inode *dir)
|
|
{
|
|
unsigned long bidx;
|
|
struct page *dentry_page;
|
|
unsigned int bit_pos;
|
|
struct f2fs_dentry_block *dentry_blk;
|
|
unsigned long nblock = dir_blocks(dir);
|
|
|
|
if (f2fs_has_inline_dentry(dir))
|
|
return f2fs_empty_inline_dir(dir);
|
|
|
|
for (bidx = 0; bidx < nblock; bidx++) {
|
|
dentry_page = get_lock_data_page(dir, bidx);
|
|
if (IS_ERR(dentry_page)) {
|
|
if (PTR_ERR(dentry_page) == -ENOENT)
|
|
continue;
|
|
else
|
|
return false;
|
|
}
|
|
|
|
dentry_blk = kmap_atomic(dentry_page);
|
|
if (bidx == 0)
|
|
bit_pos = 2;
|
|
else
|
|
bit_pos = 0;
|
|
bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
|
|
NR_DENTRY_IN_BLOCK,
|
|
bit_pos);
|
|
kunmap_atomic(dentry_blk);
|
|
|
|
f2fs_put_page(dentry_page, 1);
|
|
|
|
if (bit_pos < NR_DENTRY_IN_BLOCK)
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d,
|
|
unsigned int start_pos, struct f2fs_str *fstr)
|
|
{
|
|
unsigned char d_type = DT_UNKNOWN;
|
|
unsigned int bit_pos;
|
|
struct f2fs_dir_entry *de = NULL;
|
|
struct f2fs_str de_name = FSTR_INIT(NULL, 0);
|
|
|
|
bit_pos = ((unsigned long)ctx->pos % d->max);
|
|
|
|
while (bit_pos < d->max) {
|
|
bit_pos = find_next_bit_le(d->bitmap, d->max, bit_pos);
|
|
if (bit_pos >= d->max)
|
|
break;
|
|
|
|
de = &d->dentry[bit_pos];
|
|
if (de->file_type < F2FS_FT_MAX)
|
|
d_type = f2fs_filetype_table[de->file_type];
|
|
else
|
|
d_type = DT_UNKNOWN;
|
|
|
|
/* encrypted case */
|
|
de_name.name = d->filename[bit_pos];
|
|
de_name.len = le16_to_cpu(de->name_len);
|
|
|
|
if (f2fs_encrypted_inode(d->inode)) {
|
|
int save_len = fstr->len;
|
|
int ret;
|
|
|
|
ret = f2fs_fname_disk_to_usr(d->inode, &de->hash_code,
|
|
&de_name, fstr);
|
|
de_name = *fstr;
|
|
fstr->len = save_len;
|
|
if (ret < 0)
|
|
return true;
|
|
}
|
|
|
|
if (!dir_emit(ctx, de_name.name, de_name.len,
|
|
le32_to_cpu(de->ino), d_type))
|
|
return true;
|
|
|
|
bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
|
|
ctx->pos = start_pos + bit_pos;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static int f2fs_readdir(struct file *file, struct dir_context *ctx)
|
|
{
|
|
struct inode *inode = file_inode(file);
|
|
unsigned long npages = dir_blocks(inode);
|
|
struct f2fs_dentry_block *dentry_blk = NULL;
|
|
struct page *dentry_page = NULL;
|
|
struct file_ra_state *ra = &file->f_ra;
|
|
unsigned int n = ((unsigned long)ctx->pos / NR_DENTRY_IN_BLOCK);
|
|
struct f2fs_dentry_ptr d;
|
|
struct f2fs_str fstr = FSTR_INIT(NULL, 0);
|
|
int err = 0;
|
|
|
|
if (f2fs_encrypted_inode(inode)) {
|
|
err = f2fs_get_encryption_info(inode);
|
|
if (err)
|
|
return err;
|
|
|
|
err = f2fs_fname_crypto_alloc_buffer(inode, F2FS_NAME_LEN,
|
|
&fstr);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
if (f2fs_has_inline_dentry(inode)) {
|
|
err = f2fs_read_inline_dir(file, ctx, &fstr);
|
|
goto out;
|
|
}
|
|
|
|
/* readahead for multi pages of dir */
|
|
if (npages - n > 1 && !ra_has_index(ra, n))
|
|
page_cache_sync_readahead(inode->i_mapping, ra, file, n,
|
|
min(npages - n, (pgoff_t)MAX_DIR_RA_PAGES));
|
|
|
|
for (; n < npages; n++) {
|
|
dentry_page = get_lock_data_page(inode, n);
|
|
if (IS_ERR(dentry_page))
|
|
continue;
|
|
|
|
dentry_blk = kmap(dentry_page);
|
|
|
|
make_dentry_ptr(inode, &d, (void *)dentry_blk, 1);
|
|
|
|
if (f2fs_fill_dentries(ctx, &d, n * NR_DENTRY_IN_BLOCK, &fstr))
|
|
goto stop;
|
|
|
|
ctx->pos = (n + 1) * NR_DENTRY_IN_BLOCK;
|
|
kunmap(dentry_page);
|
|
f2fs_put_page(dentry_page, 1);
|
|
dentry_page = NULL;
|
|
}
|
|
stop:
|
|
if (dentry_page && !IS_ERR(dentry_page)) {
|
|
kunmap(dentry_page);
|
|
f2fs_put_page(dentry_page, 1);
|
|
}
|
|
out:
|
|
f2fs_fname_crypto_free_buffer(&fstr);
|
|
return err;
|
|
}
|
|
|
|
const struct file_operations f2fs_dir_operations = {
|
|
.llseek = generic_file_llseek,
|
|
.read = generic_read_dir,
|
|
.iterate = f2fs_readdir,
|
|
.fsync = f2fs_sync_file,
|
|
.unlocked_ioctl = f2fs_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = f2fs_compat_ioctl,
|
|
#endif
|
|
};
|