2012-11-28 21:28:09 -07:00
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/*
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2012-11-14 00:59:04 -07:00
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* fs/f2fs/dir.c
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*
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* Copyright (c) 2012 Samsung Electronics Co., Ltd.
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* http://www.samsung.com/
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/fs.h>
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#include <linux/f2fs_fs.h>
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#include "f2fs.h"
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#include "acl.h"
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static unsigned long dir_blocks(struct inode *inode)
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{
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return ((unsigned long long) (i_size_read(inode) + PAGE_CACHE_SIZE - 1))
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>> PAGE_CACHE_SHIFT;
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}
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static unsigned int dir_buckets(unsigned int level)
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{
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if (level < MAX_DIR_HASH_DEPTH / 2)
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return 1 << level;
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else
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return 1 << ((MAX_DIR_HASH_DEPTH / 2) - 1);
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}
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static unsigned int bucket_blocks(unsigned int level)
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{
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if (level < MAX_DIR_HASH_DEPTH / 2)
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return 2;
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else
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return 4;
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}
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static unsigned char f2fs_filetype_table[F2FS_FT_MAX] = {
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[F2FS_FT_UNKNOWN] = DT_UNKNOWN,
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[F2FS_FT_REG_FILE] = DT_REG,
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[F2FS_FT_DIR] = DT_DIR,
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[F2FS_FT_CHRDEV] = DT_CHR,
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[F2FS_FT_BLKDEV] = DT_BLK,
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[F2FS_FT_FIFO] = DT_FIFO,
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[F2FS_FT_SOCK] = DT_SOCK,
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[F2FS_FT_SYMLINK] = DT_LNK,
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};
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#define S_SHIFT 12
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static unsigned char f2fs_type_by_mode[S_IFMT >> S_SHIFT] = {
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[S_IFREG >> S_SHIFT] = F2FS_FT_REG_FILE,
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[S_IFDIR >> S_SHIFT] = F2FS_FT_DIR,
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[S_IFCHR >> S_SHIFT] = F2FS_FT_CHRDEV,
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[S_IFBLK >> S_SHIFT] = F2FS_FT_BLKDEV,
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[S_IFIFO >> S_SHIFT] = F2FS_FT_FIFO,
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[S_IFSOCK >> S_SHIFT] = F2FS_FT_SOCK,
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[S_IFLNK >> S_SHIFT] = F2FS_FT_SYMLINK,
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};
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static void set_de_type(struct f2fs_dir_entry *de, struct inode *inode)
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{
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mode_t mode = inode->i_mode;
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de->file_type = f2fs_type_by_mode[(mode & S_IFMT) >> S_SHIFT];
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}
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static unsigned long dir_block_index(unsigned int level, unsigned int idx)
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{
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unsigned long i;
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unsigned long bidx = 0;
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for (i = 0; i < level; i++)
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bidx += dir_buckets(i) * bucket_blocks(i);
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bidx += idx * bucket_blocks(level);
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return bidx;
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}
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static bool early_match_name(const char *name, int namelen,
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f2fs_hash_t namehash, struct f2fs_dir_entry *de)
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{
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if (le16_to_cpu(de->name_len) != namelen)
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return false;
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2012-11-28 00:12:41 -07:00
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if (de->hash_code != namehash)
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2012-11-14 00:59:04 -07:00
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return false;
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return true;
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}
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static struct f2fs_dir_entry *find_in_block(struct page *dentry_page,
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const char *name, int namelen, int *max_slots,
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f2fs_hash_t namehash, struct page **res_page)
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{
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struct f2fs_dir_entry *de;
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unsigned long bit_pos, end_pos, next_pos;
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struct f2fs_dentry_block *dentry_blk = kmap(dentry_page);
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int slots;
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bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
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NR_DENTRY_IN_BLOCK, 0);
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while (bit_pos < NR_DENTRY_IN_BLOCK) {
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de = &dentry_blk->dentry[bit_pos];
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slots = (le16_to_cpu(de->name_len) + F2FS_NAME_LEN - 1) /
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F2FS_NAME_LEN;
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if (early_match_name(name, namelen, namehash, de)) {
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if (!memcmp(dentry_blk->filename[bit_pos],
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name, namelen)) {
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*res_page = dentry_page;
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goto found;
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}
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}
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next_pos = bit_pos + slots;
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bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
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NR_DENTRY_IN_BLOCK, next_pos);
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if (bit_pos >= NR_DENTRY_IN_BLOCK)
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end_pos = NR_DENTRY_IN_BLOCK;
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else
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end_pos = bit_pos;
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if (*max_slots < end_pos - next_pos)
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*max_slots = end_pos - next_pos;
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}
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de = NULL;
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kunmap(dentry_page);
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found:
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return de;
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}
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static struct f2fs_dir_entry *find_in_level(struct inode *dir,
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unsigned int level, const char *name, int namelen,
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f2fs_hash_t namehash, struct page **res_page)
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{
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int s = (namelen + F2FS_NAME_LEN - 1) / F2FS_NAME_LEN;
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unsigned int nbucket, nblock;
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unsigned int bidx, end_block;
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struct page *dentry_page;
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struct f2fs_dir_entry *de = NULL;
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bool room = false;
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int max_slots = 0;
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BUG_ON(level > MAX_DIR_HASH_DEPTH);
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nbucket = dir_buckets(level);
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nblock = bucket_blocks(level);
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2012-11-28 00:12:41 -07:00
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bidx = dir_block_index(level, le32_to_cpu(namehash) % nbucket);
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2012-11-14 00:59:04 -07:00
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end_block = bidx + nblock;
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for (; bidx < end_block; bidx++) {
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/* no need to allocate new dentry pages to all the indices */
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dentry_page = find_data_page(dir, bidx);
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if (IS_ERR(dentry_page)) {
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room = true;
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continue;
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}
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de = find_in_block(dentry_page, name, namelen,
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&max_slots, namehash, res_page);
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if (de)
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break;
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if (max_slots >= s)
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room = true;
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f2fs_put_page(dentry_page, 0);
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}
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if (!de && room && F2FS_I(dir)->chash != namehash) {
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F2FS_I(dir)->chash = namehash;
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F2FS_I(dir)->clevel = level;
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}
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return de;
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}
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/*
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* Find an entry in the specified directory with the wanted name.
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* It returns the page where the entry was found (as a parameter - res_page),
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* and the entry itself. Page is returned mapped and unlocked.
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* Entry is guaranteed to be valid.
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*/
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struct f2fs_dir_entry *f2fs_find_entry(struct inode *dir,
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struct qstr *child, struct page **res_page)
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{
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const char *name = child->name;
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int namelen = child->len;
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unsigned long npages = dir_blocks(dir);
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struct f2fs_dir_entry *de = NULL;
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f2fs_hash_t name_hash;
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unsigned int max_depth;
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unsigned int level;
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if (npages == 0)
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return NULL;
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*res_page = NULL;
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name_hash = f2fs_dentry_hash(name, namelen);
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max_depth = F2FS_I(dir)->i_current_depth;
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for (level = 0; level < max_depth; level++) {
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de = find_in_level(dir, level, name,
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namelen, name_hash, res_page);
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if (de)
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break;
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}
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if (!de && F2FS_I(dir)->chash != name_hash) {
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F2FS_I(dir)->chash = name_hash;
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F2FS_I(dir)->clevel = level - 1;
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}
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return de;
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}
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struct f2fs_dir_entry *f2fs_parent_dir(struct inode *dir, struct page **p)
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{
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struct page *page = NULL;
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struct f2fs_dir_entry *de = NULL;
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struct f2fs_dentry_block *dentry_blk = NULL;
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page = get_lock_data_page(dir, 0);
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if (IS_ERR(page))
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return NULL;
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dentry_blk = kmap(page);
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de = &dentry_blk->dentry[1];
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*p = page;
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unlock_page(page);
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return de;
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}
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ino_t f2fs_inode_by_name(struct inode *dir, struct qstr *qstr)
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{
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ino_t res = 0;
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struct f2fs_dir_entry *de;
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struct page *page;
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de = f2fs_find_entry(dir, qstr, &page);
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if (de) {
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res = le32_to_cpu(de->ino);
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kunmap(page);
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f2fs_put_page(page, 0);
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}
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return res;
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}
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void f2fs_set_link(struct inode *dir, struct f2fs_dir_entry *de,
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struct page *page, struct inode *inode)
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{
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struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
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mutex_lock_op(sbi, DENTRY_OPS);
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lock_page(page);
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wait_on_page_writeback(page);
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de->ino = cpu_to_le32(inode->i_ino);
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set_de_type(de, inode);
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kunmap(page);
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set_page_dirty(page);
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dir->i_mtime = dir->i_ctime = CURRENT_TIME;
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mark_inode_dirty(dir);
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f2fs_put_page(page, 1);
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mutex_unlock_op(sbi, DENTRY_OPS);
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}
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void init_dent_inode(struct dentry *dentry, struct page *ipage)
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{
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struct inode *dir = dentry->d_parent->d_inode;
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struct f2fs_node *rn;
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if (IS_ERR(ipage))
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return;
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wait_on_page_writeback(ipage);
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/* copy dentry info. to this inode page */
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rn = (struct f2fs_node *)page_address(ipage);
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rn->i.i_pino = cpu_to_le32(dir->i_ino);
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rn->i.i_namelen = cpu_to_le32(dentry->d_name.len);
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memcpy(rn->i.i_name, dentry->d_name.name, dentry->d_name.len);
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set_page_dirty(ipage);
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}
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static int init_inode_metadata(struct inode *inode, struct dentry *dentry)
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{
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struct inode *dir = dentry->d_parent->d_inode;
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if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) {
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int err;
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err = new_inode_page(inode, dentry);
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if (err)
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return err;
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if (S_ISDIR(inode->i_mode)) {
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err = f2fs_make_empty(inode, dir);
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if (err) {
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remove_inode_page(inode);
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return err;
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}
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}
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err = f2fs_init_acl(inode, dir);
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if (err) {
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remove_inode_page(inode);
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return err;
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}
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} else {
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struct page *ipage;
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ipage = get_node_page(F2FS_SB(dir->i_sb), inode->i_ino);
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if (IS_ERR(ipage))
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return PTR_ERR(ipage);
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init_dent_inode(dentry, ipage);
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f2fs_put_page(ipage, 1);
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}
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if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK)) {
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inc_nlink(inode);
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f2fs_write_inode(inode, NULL);
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}
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return 0;
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}
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static void update_parent_metadata(struct inode *dir, struct inode *inode,
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unsigned int current_depth)
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{
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bool need_dir_update = false;
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if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) {
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if (S_ISDIR(inode->i_mode)) {
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inc_nlink(dir);
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need_dir_update = true;
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}
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clear_inode_flag(F2FS_I(inode), FI_NEW_INODE);
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}
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dir->i_mtime = dir->i_ctime = CURRENT_TIME;
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if (F2FS_I(dir)->i_current_depth != current_depth) {
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F2FS_I(dir)->i_current_depth = current_depth;
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need_dir_update = true;
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}
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if (need_dir_update)
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f2fs_write_inode(dir, NULL);
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else
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mark_inode_dirty(dir);
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if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK))
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clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
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}
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static int room_for_filename(struct f2fs_dentry_block *dentry_blk, int slots)
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{
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int bit_start = 0;
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int zero_start, zero_end;
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next:
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zero_start = find_next_zero_bit_le(&dentry_blk->dentry_bitmap,
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NR_DENTRY_IN_BLOCK,
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bit_start);
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if (zero_start >= NR_DENTRY_IN_BLOCK)
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return NR_DENTRY_IN_BLOCK;
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zero_end = find_next_bit_le(&dentry_blk->dentry_bitmap,
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NR_DENTRY_IN_BLOCK,
|
|
|
|
zero_start);
|
|
|
|
if (zero_end - zero_start >= slots)
|
|
|
|
return zero_start;
|
|
|
|
|
|
|
|
bit_start = zero_end + 1;
|
|
|
|
|
|
|
|
if (zero_end + 1 >= NR_DENTRY_IN_BLOCK)
|
|
|
|
return NR_DENTRY_IN_BLOCK;
|
|
|
|
goto next;
|
|
|
|
}
|
|
|
|
|
|
|
|
int f2fs_add_link(struct dentry *dentry, struct inode *inode)
|
|
|
|
{
|
|
|
|
unsigned int bit_pos;
|
|
|
|
unsigned int level;
|
|
|
|
unsigned int current_depth;
|
|
|
|
unsigned long bidx, block;
|
|
|
|
f2fs_hash_t dentry_hash;
|
|
|
|
struct f2fs_dir_entry *de;
|
|
|
|
unsigned int nbucket, nblock;
|
|
|
|
struct inode *dir = dentry->d_parent->d_inode;
|
|
|
|
struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
|
|
|
|
const char *name = dentry->d_name.name;
|
|
|
|
int namelen = dentry->d_name.len;
|
|
|
|
struct page *dentry_page = NULL;
|
|
|
|
struct f2fs_dentry_block *dentry_blk = NULL;
|
|
|
|
int slots = (namelen + F2FS_NAME_LEN - 1) / F2FS_NAME_LEN;
|
|
|
|
int err = 0;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
dentry_hash = f2fs_dentry_hash(name, dentry->d_name.len);
|
|
|
|
level = 0;
|
|
|
|
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 (current_depth == MAX_DIR_HASH_DEPTH)
|
|
|
|
return -ENOSPC;
|
|
|
|
|
|
|
|
/* Increase the depth, if required */
|
|
|
|
if (level == current_depth)
|
|
|
|
++current_depth;
|
|
|
|
|
|
|
|
nbucket = dir_buckets(level);
|
|
|
|
nblock = bucket_blocks(level);
|
|
|
|
|
2012-11-28 00:12:41 -07:00
|
|
|
bidx = dir_block_index(level, (le32_to_cpu(dentry_hash) % nbucket));
|
2012-11-14 00:59:04 -07:00
|
|
|
|
|
|
|
for (block = bidx; block <= (bidx + nblock - 1); block++) {
|
|
|
|
mutex_lock_op(sbi, DENTRY_OPS);
|
|
|
|
dentry_page = get_new_data_page(dir, block, true);
|
|
|
|
if (IS_ERR(dentry_page)) {
|
|
|
|
mutex_unlock_op(sbi, DENTRY_OPS);
|
|
|
|
return PTR_ERR(dentry_page);
|
|
|
|
}
|
|
|
|
|
|
|
|
dentry_blk = kmap(dentry_page);
|
|
|
|
bit_pos = room_for_filename(dentry_blk, slots);
|
|
|
|
if (bit_pos < NR_DENTRY_IN_BLOCK)
|
|
|
|
goto add_dentry;
|
|
|
|
|
|
|
|
kunmap(dentry_page);
|
|
|
|
f2fs_put_page(dentry_page, 1);
|
|
|
|
mutex_unlock_op(sbi, DENTRY_OPS);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Move to next level to find the empty slot for new dentry */
|
|
|
|
++level;
|
|
|
|
goto start;
|
|
|
|
add_dentry:
|
|
|
|
err = init_inode_metadata(inode, dentry);
|
|
|
|
if (err)
|
|
|
|
goto fail;
|
|
|
|
|
|
|
|
wait_on_page_writeback(dentry_page);
|
|
|
|
|
|
|
|
de = &dentry_blk->dentry[bit_pos];
|
2012-11-28 00:12:41 -07:00
|
|
|
de->hash_code = dentry_hash;
|
2012-11-14 00:59:04 -07:00
|
|
|
de->name_len = cpu_to_le16(namelen);
|
|
|
|
memcpy(dentry_blk->filename[bit_pos], name, namelen);
|
|
|
|
de->ino = cpu_to_le32(inode->i_ino);
|
|
|
|
set_de_type(de, inode);
|
|
|
|
for (i = 0; i < slots; i++)
|
|
|
|
test_and_set_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
|
|
|
|
set_page_dirty(dentry_page);
|
|
|
|
update_parent_metadata(dir, inode, current_depth);
|
|
|
|
fail:
|
|
|
|
kunmap(dentry_page);
|
|
|
|
f2fs_put_page(dentry_page, 1);
|
|
|
|
mutex_unlock_op(sbi, DENTRY_OPS);
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
2012-11-28 21:28:09 -07:00
|
|
|
/*
|
2012-11-14 00:59:04 -07:00
|
|
|
* 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 *inode)
|
|
|
|
{
|
|
|
|
struct f2fs_dentry_block *dentry_blk;
|
|
|
|
unsigned int bit_pos;
|
|
|
|
struct address_space *mapping = page->mapping;
|
|
|
|
struct inode *dir = mapping->host;
|
|
|
|
struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
|
|
|
|
int slots = (le16_to_cpu(dentry->name_len) + F2FS_NAME_LEN - 1) /
|
|
|
|
F2FS_NAME_LEN;
|
|
|
|
void *kaddr = page_address(page);
|
|
|
|
int i;
|
|
|
|
|
|
|
|
mutex_lock_op(sbi, DENTRY_OPS);
|
|
|
|
|
|
|
|
lock_page(page);
|
|
|
|
wait_on_page_writeback(page);
|
|
|
|
|
|
|
|
dentry_blk = (struct f2fs_dentry_block *)kaddr;
|
|
|
|
bit_pos = dentry - (struct f2fs_dir_entry *)dentry_blk->dentry;
|
|
|
|
for (i = 0; i < slots; i++)
|
|
|
|
test_and_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 && S_ISDIR(inode->i_mode)) {
|
|
|
|
drop_nlink(dir);
|
|
|
|
f2fs_write_inode(dir, NULL);
|
|
|
|
} else {
|
|
|
|
mark_inode_dirty(dir);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (inode) {
|
|
|
|
inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
|
|
|
|
drop_nlink(inode);
|
|
|
|
if (S_ISDIR(inode->i_mode)) {
|
|
|
|
drop_nlink(inode);
|
|
|
|
i_size_write(inode, 0);
|
|
|
|
}
|
|
|
|
f2fs_write_inode(inode, NULL);
|
|
|
|
if (inode->i_nlink == 0)
|
|
|
|
add_orphan_inode(sbi, inode->i_ino);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (bit_pos == NR_DENTRY_IN_BLOCK) {
|
|
|
|
truncate_hole(dir, page->index, page->index + 1);
|
|
|
|
clear_page_dirty_for_io(page);
|
|
|
|
ClearPageUptodate(page);
|
|
|
|
dec_page_count(sbi, F2FS_DIRTY_DENTS);
|
|
|
|
inode_dec_dirty_dents(dir);
|
|
|
|
}
|
2012-12-07 22:54:35 -07:00
|
|
|
f2fs_put_page(page, 1);
|
|
|
|
|
2012-11-14 00:59:04 -07:00
|
|
|
mutex_unlock_op(sbi, DENTRY_OPS);
|
|
|
|
}
|
|
|
|
|
|
|
|
int f2fs_make_empty(struct inode *inode, struct inode *parent)
|
|
|
|
{
|
|
|
|
struct page *dentry_page;
|
|
|
|
struct f2fs_dentry_block *dentry_blk;
|
|
|
|
struct f2fs_dir_entry *de;
|
|
|
|
void *kaddr;
|
|
|
|
|
|
|
|
dentry_page = get_new_data_page(inode, 0, true);
|
|
|
|
if (IS_ERR(dentry_page))
|
|
|
|
return PTR_ERR(dentry_page);
|
|
|
|
|
|
|
|
kaddr = kmap_atomic(dentry_page);
|
|
|
|
dentry_blk = (struct f2fs_dentry_block *)kaddr;
|
|
|
|
|
|
|
|
de = &dentry_blk->dentry[0];
|
|
|
|
de->name_len = cpu_to_le16(1);
|
|
|
|
de->hash_code = 0;
|
|
|
|
de->ino = cpu_to_le32(inode->i_ino);
|
|
|
|
memcpy(dentry_blk->filename[0], ".", 1);
|
|
|
|
set_de_type(de, inode);
|
|
|
|
|
|
|
|
de = &dentry_blk->dentry[1];
|
|
|
|
de->hash_code = 0;
|
|
|
|
de->name_len = cpu_to_le16(2);
|
|
|
|
de->ino = cpu_to_le32(parent->i_ino);
|
|
|
|
memcpy(dentry_blk->filename[1], "..", 2);
|
|
|
|
set_de_type(de, inode);
|
|
|
|
|
|
|
|
test_and_set_bit_le(0, &dentry_blk->dentry_bitmap);
|
|
|
|
test_and_set_bit_le(1, &dentry_blk->dentry_bitmap);
|
|
|
|
kunmap_atomic(kaddr);
|
|
|
|
|
|
|
|
set_page_dirty(dentry_page);
|
|
|
|
f2fs_put_page(dentry_page, 1);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
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);
|
|
|
|
|
|
|
|
for (bidx = 0; bidx < nblock; bidx++) {
|
|
|
|
void *kaddr;
|
|
|
|
dentry_page = get_lock_data_page(dir, bidx);
|
|
|
|
if (IS_ERR(dentry_page)) {
|
|
|
|
if (PTR_ERR(dentry_page) == -ENOENT)
|
|
|
|
continue;
|
|
|
|
else
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
kaddr = kmap_atomic(dentry_page);
|
|
|
|
dentry_blk = (struct f2fs_dentry_block *)kaddr;
|
|
|
|
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(kaddr);
|
|
|
|
|
|
|
|
f2fs_put_page(dentry_page, 1);
|
|
|
|
|
|
|
|
if (bit_pos < NR_DENTRY_IN_BLOCK)
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int f2fs_readdir(struct file *file, void *dirent, filldir_t filldir)
|
|
|
|
{
|
|
|
|
unsigned long pos = file->f_pos;
|
|
|
|
struct inode *inode = file->f_dentry->d_inode;
|
|
|
|
unsigned long npages = dir_blocks(inode);
|
|
|
|
unsigned char *types = NULL;
|
|
|
|
unsigned int bit_pos = 0, start_bit_pos = 0;
|
|
|
|
int over = 0;
|
|
|
|
struct f2fs_dentry_block *dentry_blk = NULL;
|
|
|
|
struct f2fs_dir_entry *de = NULL;
|
|
|
|
struct page *dentry_page = NULL;
|
|
|
|
unsigned int n = 0;
|
|
|
|
unsigned char d_type = DT_UNKNOWN;
|
|
|
|
int slots;
|
|
|
|
|
|
|
|
types = f2fs_filetype_table;
|
|
|
|
bit_pos = (pos % NR_DENTRY_IN_BLOCK);
|
|
|
|
n = (pos / NR_DENTRY_IN_BLOCK);
|
|
|
|
|
|
|
|
for ( ; n < npages; n++) {
|
|
|
|
dentry_page = get_lock_data_page(inode, n);
|
|
|
|
if (IS_ERR(dentry_page))
|
|
|
|
continue;
|
|
|
|
|
|
|
|
start_bit_pos = bit_pos;
|
|
|
|
dentry_blk = kmap(dentry_page);
|
|
|
|
while (bit_pos < NR_DENTRY_IN_BLOCK) {
|
|
|
|
d_type = DT_UNKNOWN;
|
|
|
|
bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
|
|
|
|
NR_DENTRY_IN_BLOCK,
|
|
|
|
bit_pos);
|
|
|
|
if (bit_pos >= NR_DENTRY_IN_BLOCK)
|
|
|
|
break;
|
|
|
|
|
|
|
|
de = &dentry_blk->dentry[bit_pos];
|
|
|
|
if (types && de->file_type < F2FS_FT_MAX)
|
|
|
|
d_type = types[de->file_type];
|
|
|
|
|
|
|
|
over = filldir(dirent,
|
|
|
|
dentry_blk->filename[bit_pos],
|
|
|
|
le16_to_cpu(de->name_len),
|
|
|
|
(n * NR_DENTRY_IN_BLOCK) + bit_pos,
|
|
|
|
le32_to_cpu(de->ino), d_type);
|
|
|
|
if (over) {
|
|
|
|
file->f_pos += bit_pos - start_bit_pos;
|
|
|
|
goto success;
|
|
|
|
}
|
|
|
|
slots = (le16_to_cpu(de->name_len) + F2FS_NAME_LEN - 1)
|
|
|
|
/ F2FS_NAME_LEN;
|
|
|
|
bit_pos += slots;
|
|
|
|
}
|
|
|
|
bit_pos = 0;
|
|
|
|
file->f_pos = (n + 1) * NR_DENTRY_IN_BLOCK;
|
|
|
|
kunmap(dentry_page);
|
|
|
|
f2fs_put_page(dentry_page, 1);
|
|
|
|
dentry_page = NULL;
|
|
|
|
}
|
|
|
|
success:
|
|
|
|
if (dentry_page && !IS_ERR(dentry_page)) {
|
|
|
|
kunmap(dentry_page);
|
|
|
|
f2fs_put_page(dentry_page, 1);
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
const struct file_operations f2fs_dir_operations = {
|
|
|
|
.llseek = generic_file_llseek,
|
|
|
|
.read = generic_read_dir,
|
|
|
|
.readdir = f2fs_readdir,
|
|
|
|
.fsync = f2fs_sync_file,
|
|
|
|
.unlocked_ioctl = f2fs_ioctl,
|
|
|
|
};
|