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- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
- */
- #include <linux/iversion.h>
- #include <linux/namei.h>
- #include <linux/slab.h>
- #include <linux/buffer_head.h>
- #include <linux/nls.h>
- #include "exfat_raw.h"
- #include "exfat_fs.h"
- static inline unsigned long exfat_d_version(struct dentry *dentry)
- {
- return (unsigned long) dentry->d_fsdata;
- }
- static inline void exfat_d_version_set(struct dentry *dentry,
- unsigned long version)
- {
- dentry->d_fsdata = (void *) version;
- }
- /*
- * If new entry was created in the parent, it could create the 8.3 alias (the
- * shortname of logname). So, the parent may have the negative-dentry which
- * matches the created 8.3 alias.
- *
- * If it happened, the negative dentry isn't actually negative anymore. So,
- * drop it.
- */
- static int exfat_d_revalidate(struct dentry *dentry, unsigned int flags)
- {
- int ret;
- if (flags & LOOKUP_RCU)
- return -ECHILD;
- /*
- * This is not negative dentry. Always valid.
- *
- * Note, rename() to existing directory entry will have ->d_inode, and
- * will use existing name which isn't specified name by user.
- *
- * We may be able to drop this positive dentry here. But dropping
- * positive dentry isn't good idea. So it's unsupported like
- * rename("filename", "FILENAME") for now.
- */
- if (d_really_is_positive(dentry))
- return 1;
- /*
- * Drop the negative dentry, in order to make sure to use the case
- * sensitive name which is specified by user if this is for creation.
- */
- if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
- return 0;
- spin_lock(&dentry->d_lock);
- ret = inode_eq_iversion(d_inode(dentry->d_parent),
- exfat_d_version(dentry));
- spin_unlock(&dentry->d_lock);
- return ret;
- }
- /* returns the length of a struct qstr, ignoring trailing dots */
- static unsigned int exfat_striptail_len(unsigned int len, const char *name)
- {
- while (len && name[len - 1] == '.')
- len--;
- return len;
- }
- /*
- * Compute the hash for the exfat name corresponding to the dentry. If the name
- * is invalid, we leave the hash code unchanged so that the existing dentry can
- * be used. The exfat fs routines will return ENOENT or EINVAL as appropriate.
- */
- static int exfat_d_hash(const struct dentry *dentry, struct qstr *qstr)
- {
- struct super_block *sb = dentry->d_sb;
- struct nls_table *t = EXFAT_SB(sb)->nls_io;
- const unsigned char *name = qstr->name;
- unsigned int len = exfat_striptail_len(qstr->len, qstr->name);
- unsigned long hash = init_name_hash(dentry);
- int i, charlen;
- wchar_t c;
- for (i = 0; i < len; i += charlen) {
- charlen = t->char2uni(&name[i], len - i, &c);
- if (charlen < 0)
- return charlen;
- hash = partial_name_hash(exfat_toupper(sb, c), hash);
- }
- qstr->hash = end_name_hash(hash);
- return 0;
- }
- static int exfat_d_cmp(const struct dentry *dentry, unsigned int len,
- const char *str, const struct qstr *name)
- {
- struct super_block *sb = dentry->d_sb;
- struct nls_table *t = EXFAT_SB(sb)->nls_io;
- unsigned int alen = exfat_striptail_len(name->len, name->name);
- unsigned int blen = exfat_striptail_len(len, str);
- wchar_t c1, c2;
- int charlen, i;
- if (alen != blen)
- return 1;
- for (i = 0; i < len; i += charlen) {
- charlen = t->char2uni(&name->name[i], alen - i, &c1);
- if (charlen < 0)
- return 1;
- if (charlen != t->char2uni(&str[i], blen - i, &c2))
- return 1;
- if (exfat_toupper(sb, c1) != exfat_toupper(sb, c2))
- return 1;
- }
- return 0;
- }
- const struct dentry_operations exfat_dentry_ops = {
- .d_revalidate = exfat_d_revalidate,
- .d_hash = exfat_d_hash,
- .d_compare = exfat_d_cmp,
- };
- static int exfat_utf8_d_hash(const struct dentry *dentry, struct qstr *qstr)
- {
- struct super_block *sb = dentry->d_sb;
- const unsigned char *name = qstr->name;
- unsigned int len = exfat_striptail_len(qstr->len, qstr->name);
- unsigned long hash = init_name_hash(dentry);
- int i, charlen;
- unicode_t u;
- for (i = 0; i < len; i += charlen) {
- charlen = utf8_to_utf32(&name[i], len - i, &u);
- if (charlen < 0)
- return charlen;
- /*
- * exfat_toupper() works only for code points up to the U+FFFF.
- */
- hash = partial_name_hash(u <= 0xFFFF ? exfat_toupper(sb, u) : u,
- hash);
- }
- qstr->hash = end_name_hash(hash);
- return 0;
- }
- static int exfat_utf8_d_cmp(const struct dentry *dentry, unsigned int len,
- const char *str, const struct qstr *name)
- {
- struct super_block *sb = dentry->d_sb;
- unsigned int alen = exfat_striptail_len(name->len, name->name);
- unsigned int blen = exfat_striptail_len(len, str);
- unicode_t u_a, u_b;
- int charlen, i;
- if (alen != blen)
- return 1;
- for (i = 0; i < alen; i += charlen) {
- charlen = utf8_to_utf32(&name->name[i], alen - i, &u_a);
- if (charlen < 0)
- return 1;
- if (charlen != utf8_to_utf32(&str[i], blen - i, &u_b))
- return 1;
- if (u_a <= 0xFFFF && u_b <= 0xFFFF) {
- if (exfat_toupper(sb, u_a) != exfat_toupper(sb, u_b))
- return 1;
- } else {
- if (u_a != u_b)
- return 1;
- }
- }
- return 0;
- }
- const struct dentry_operations exfat_utf8_dentry_ops = {
- .d_revalidate = exfat_d_revalidate,
- .d_hash = exfat_utf8_d_hash,
- .d_compare = exfat_utf8_d_cmp,
- };
- /* used only in search empty_slot() */
- #define CNT_UNUSED_NOHIT (-1)
- #define CNT_UNUSED_HIT (-2)
- /* search EMPTY CONTINUOUS "num_entries" entries */
- static int exfat_search_empty_slot(struct super_block *sb,
- struct exfat_hint_femp *hint_femp, struct exfat_chain *p_dir,
- int num_entries)
- {
- int i, dentry, num_empty = 0;
- int dentries_per_clu;
- unsigned int type;
- struct exfat_chain clu;
- struct exfat_dentry *ep;
- struct exfat_sb_info *sbi = EXFAT_SB(sb);
- struct buffer_head *bh;
- dentries_per_clu = sbi->dentries_per_clu;
- if (hint_femp->eidx != EXFAT_HINT_NONE) {
- dentry = hint_femp->eidx;
- if (num_entries <= hint_femp->count) {
- hint_femp->eidx = EXFAT_HINT_NONE;
- return dentry;
- }
- exfat_chain_dup(&clu, &hint_femp->cur);
- } else {
- exfat_chain_dup(&clu, p_dir);
- dentry = 0;
- }
- while (clu.dir != EXFAT_EOF_CLUSTER) {
- i = dentry & (dentries_per_clu - 1);
- for (; i < dentries_per_clu; i++, dentry++) {
- ep = exfat_get_dentry(sb, &clu, i, &bh, NULL);
- if (!ep)
- return -EIO;
- type = exfat_get_entry_type(ep);
- brelse(bh);
- if (type == TYPE_UNUSED || type == TYPE_DELETED) {
- num_empty++;
- if (hint_femp->eidx == EXFAT_HINT_NONE) {
- hint_femp->eidx = dentry;
- hint_femp->count = CNT_UNUSED_NOHIT;
- exfat_chain_set(&hint_femp->cur,
- clu.dir, clu.size, clu.flags);
- }
- if (type == TYPE_UNUSED &&
- hint_femp->count != CNT_UNUSED_HIT)
- hint_femp->count = CNT_UNUSED_HIT;
- } else {
- if (hint_femp->eidx != EXFAT_HINT_NONE &&
- hint_femp->count == CNT_UNUSED_HIT) {
- /* unused empty group means
- * an empty group which includes
- * unused dentry
- */
- exfat_fs_error(sb,
- "found bogus dentry(%d) beyond unused empty group(%d) (start_clu : %u, cur_clu : %u)",
- dentry, hint_femp->eidx,
- p_dir->dir, clu.dir);
- return -EIO;
- }
- num_empty = 0;
- hint_femp->eidx = EXFAT_HINT_NONE;
- }
- if (num_empty >= num_entries) {
- /* found and invalidate hint_femp */
- hint_femp->eidx = EXFAT_HINT_NONE;
- return (dentry - (num_entries - 1));
- }
- }
- if (clu.flags == ALLOC_NO_FAT_CHAIN) {
- if (--clu.size > 0)
- clu.dir++;
- else
- clu.dir = EXFAT_EOF_CLUSTER;
- } else {
- if (exfat_get_next_cluster(sb, &clu.dir))
- return -EIO;
- }
- }
- return -ENOSPC;
- }
- static int exfat_check_max_dentries(struct inode *inode)
- {
- if (EXFAT_B_TO_DEN(i_size_read(inode)) >= MAX_EXFAT_DENTRIES) {
- /*
- * exFAT spec allows a dir to grow up to 8388608(256MB)
- * dentries
- */
- return -ENOSPC;
- }
- return 0;
- }
- /* find empty directory entry.
- * if there isn't any empty slot, expand cluster chain.
- */
- static int exfat_find_empty_entry(struct inode *inode,
- struct exfat_chain *p_dir, int num_entries)
- {
- int dentry;
- unsigned int ret, last_clu;
- sector_t sector;
- loff_t size = 0;
- struct exfat_chain clu;
- struct exfat_dentry *ep = NULL;
- struct super_block *sb = inode->i_sb;
- struct exfat_sb_info *sbi = EXFAT_SB(sb);
- struct exfat_inode_info *ei = EXFAT_I(inode);
- struct exfat_hint_femp hint_femp;
- hint_femp.eidx = EXFAT_HINT_NONE;
- if (ei->hint_femp.eidx != EXFAT_HINT_NONE) {
- hint_femp = ei->hint_femp;
- ei->hint_femp.eidx = EXFAT_HINT_NONE;
- }
- while ((dentry = exfat_search_empty_slot(sb, &hint_femp, p_dir,
- num_entries)) < 0) {
- if (dentry == -EIO)
- break;
- if (exfat_check_max_dentries(inode))
- return -ENOSPC;
- /* we trust p_dir->size regardless of FAT type */
- if (exfat_find_last_cluster(sb, p_dir, &last_clu))
- return -EIO;
- /*
- * Allocate new cluster to this directory
- */
- exfat_chain_set(&clu, last_clu + 1, 0, p_dir->flags);
- /* allocate a cluster */
- ret = exfat_alloc_cluster(inode, 1, &clu);
- if (ret)
- return ret;
- if (exfat_zeroed_cluster(inode, clu.dir))
- return -EIO;
- /* append to the FAT chain */
- if (clu.flags != p_dir->flags) {
- /* no-fat-chain bit is disabled,
- * so fat-chain should be synced with alloc-bitmap
- */
- exfat_chain_cont_cluster(sb, p_dir->dir, p_dir->size);
- p_dir->flags = ALLOC_FAT_CHAIN;
- hint_femp.cur.flags = ALLOC_FAT_CHAIN;
- }
- if (clu.flags == ALLOC_FAT_CHAIN)
- if (exfat_ent_set(sb, last_clu, clu.dir))
- return -EIO;
- if (hint_femp.eidx == EXFAT_HINT_NONE) {
- /* the special case that new dentry
- * should be allocated from the start of new cluster
- */
- hint_femp.eidx = EXFAT_B_TO_DEN_IDX(p_dir->size, sbi);
- hint_femp.count = sbi->dentries_per_clu;
- exfat_chain_set(&hint_femp.cur, clu.dir, 0, clu.flags);
- }
- hint_femp.cur.size++;
- p_dir->size++;
- size = EXFAT_CLU_TO_B(p_dir->size, sbi);
- /* update the directory entry */
- if (p_dir->dir != sbi->root_dir) {
- struct buffer_head *bh;
- ep = exfat_get_dentry(sb,
- &(ei->dir), ei->entry + 1, &bh, §or);
- if (!ep)
- return -EIO;
- ep->dentry.stream.valid_size = cpu_to_le64(size);
- ep->dentry.stream.size = ep->dentry.stream.valid_size;
- ep->dentry.stream.flags = p_dir->flags;
- exfat_update_bh(bh, IS_DIRSYNC(inode));
- brelse(bh);
- if (exfat_update_dir_chksum(inode, &(ei->dir),
- ei->entry))
- return -EIO;
- }
- /* directory inode should be updated in here */
- i_size_write(inode, size);
- ei->i_size_ondisk += sbi->cluster_size;
- ei->i_size_aligned += sbi->cluster_size;
- ei->flags = p_dir->flags;
- inode->i_blocks += 1 << sbi->sect_per_clus_bits;
- }
- return dentry;
- }
- /*
- * Name Resolution Functions :
- * Zero if it was successful; otherwise nonzero.
- */
- static int __exfat_resolve_path(struct inode *inode, const unsigned char *path,
- struct exfat_chain *p_dir, struct exfat_uni_name *p_uniname,
- int lookup)
- {
- int namelen;
- int lossy = NLS_NAME_NO_LOSSY;
- struct super_block *sb = inode->i_sb;
- struct exfat_sb_info *sbi = EXFAT_SB(sb);
- struct exfat_inode_info *ei = EXFAT_I(inode);
- /* strip all trailing periods */
- namelen = exfat_striptail_len(strlen(path), path);
- if (!namelen)
- return -ENOENT;
- if (strlen(path) > (MAX_NAME_LENGTH * MAX_CHARSET_SIZE))
- return -ENAMETOOLONG;
- /*
- * strip all leading spaces :
- * "MS windows 7" supports leading spaces.
- * So we should skip this preprocessing for compatibility.
- */
- /* file name conversion :
- * If lookup case, we allow bad-name for compatibility.
- */
- namelen = exfat_nls_to_utf16(sb, path, namelen, p_uniname,
- &lossy);
- if (namelen < 0)
- return namelen; /* return error value */
- if ((lossy && !lookup) || !namelen)
- return -EINVAL;
- exfat_chain_set(p_dir, ei->start_clu,
- EXFAT_B_TO_CLU(i_size_read(inode), sbi), ei->flags);
- return 0;
- }
- static inline int exfat_resolve_path(struct inode *inode,
- const unsigned char *path, struct exfat_chain *dir,
- struct exfat_uni_name *uni)
- {
- return __exfat_resolve_path(inode, path, dir, uni, 0);
- }
- static inline int exfat_resolve_path_for_lookup(struct inode *inode,
- const unsigned char *path, struct exfat_chain *dir,
- struct exfat_uni_name *uni)
- {
- return __exfat_resolve_path(inode, path, dir, uni, 1);
- }
- static inline loff_t exfat_make_i_pos(struct exfat_dir_entry *info)
- {
- return ((loff_t) info->dir.dir << 32) | (info->entry & 0xffffffff);
- }
- static int exfat_add_entry(struct inode *inode, const char *path,
- struct exfat_chain *p_dir, unsigned int type,
- struct exfat_dir_entry *info)
- {
- int ret, dentry, num_entries;
- struct super_block *sb = inode->i_sb;
- struct exfat_sb_info *sbi = EXFAT_SB(sb);
- struct exfat_uni_name uniname;
- struct exfat_chain clu;
- int clu_size = 0;
- unsigned int start_clu = EXFAT_FREE_CLUSTER;
- ret = exfat_resolve_path(inode, path, p_dir, &uniname);
- if (ret)
- goto out;
- num_entries = exfat_calc_num_entries(&uniname);
- if (num_entries < 0) {
- ret = num_entries;
- goto out;
- }
- /* exfat_find_empty_entry must be called before alloc_cluster() */
- dentry = exfat_find_empty_entry(inode, p_dir, num_entries);
- if (dentry < 0) {
- ret = dentry; /* -EIO or -ENOSPC */
- goto out;
- }
- if (type == TYPE_DIR) {
- ret = exfat_alloc_new_dir(inode, &clu);
- if (ret)
- goto out;
- start_clu = clu.dir;
- clu_size = sbi->cluster_size;
- }
- /* update the directory entry */
- /* fill the dos name directory entry information of the created file.
- * the first cluster is not determined yet. (0)
- */
- ret = exfat_init_dir_entry(inode, p_dir, dentry, type,
- start_clu, clu_size);
- if (ret)
- goto out;
- ret = exfat_init_ext_entry(inode, p_dir, dentry, num_entries, &uniname);
- if (ret)
- goto out;
- info->dir = *p_dir;
- info->entry = dentry;
- info->flags = ALLOC_NO_FAT_CHAIN;
- info->type = type;
- if (type == TYPE_FILE) {
- info->attr = ATTR_ARCHIVE;
- info->start_clu = EXFAT_EOF_CLUSTER;
- info->size = 0;
- info->num_subdirs = 0;
- } else {
- info->attr = ATTR_SUBDIR;
- info->start_clu = start_clu;
- info->size = clu_size;
- info->num_subdirs = EXFAT_MIN_SUBDIR;
- }
- memset(&info->crtime, 0, sizeof(info->crtime));
- memset(&info->mtime, 0, sizeof(info->mtime));
- memset(&info->atime, 0, sizeof(info->atime));
- out:
- return ret;
- }
- static int exfat_create(struct inode *dir, struct dentry *dentry, umode_t mode,
- bool excl)
- {
- struct super_block *sb = dir->i_sb;
- struct inode *inode;
- struct exfat_chain cdir;
- struct exfat_dir_entry info;
- loff_t i_pos;
- int err;
- mutex_lock(&EXFAT_SB(sb)->s_lock);
- exfat_set_volume_dirty(sb);
- err = exfat_add_entry(dir, dentry->d_name.name, &cdir, TYPE_FILE,
- &info);
- exfat_clear_volume_dirty(sb);
- if (err)
- goto unlock;
- inode_inc_iversion(dir);
- dir->i_ctime = dir->i_mtime = current_time(dir);
- if (IS_DIRSYNC(dir))
- exfat_sync_inode(dir);
- else
- mark_inode_dirty(dir);
- i_pos = exfat_make_i_pos(&info);
- inode = exfat_build_inode(sb, &info, i_pos);
- err = PTR_ERR_OR_ZERO(inode);
- if (err)
- goto unlock;
- inode_inc_iversion(inode);
- inode->i_mtime = inode->i_atime = inode->i_ctime =
- EXFAT_I(inode)->i_crtime = current_time(inode);
- exfat_truncate_atime(&inode->i_atime);
- /* timestamp is already written, so mark_inode_dirty() is unneeded. */
- d_instantiate(dentry, inode);
- unlock:
- mutex_unlock(&EXFAT_SB(sb)->s_lock);
- return err;
- }
- /* lookup a file */
- static int exfat_find(struct inode *dir, struct qstr *qname,
- struct exfat_dir_entry *info)
- {
- int ret, dentry, num_entries, count;
- struct exfat_chain cdir;
- struct exfat_uni_name uni_name;
- struct super_block *sb = dir->i_sb;
- struct exfat_sb_info *sbi = EXFAT_SB(sb);
- struct exfat_inode_info *ei = EXFAT_I(dir);
- struct exfat_dentry *ep, *ep2;
- struct exfat_entry_set_cache *es;
- if (qname->len == 0)
- return -ENOENT;
- /* check the validity of directory name in the given pathname */
- ret = exfat_resolve_path_for_lookup(dir, qname->name, &cdir, &uni_name);
- if (ret)
- return ret;
- num_entries = exfat_calc_num_entries(&uni_name);
- if (num_entries < 0)
- return num_entries;
- /* check the validation of hint_stat and initialize it if required */
- if (ei->version != (inode_peek_iversion_raw(dir) & 0xffffffff)) {
- ei->hint_stat.clu = cdir.dir;
- ei->hint_stat.eidx = 0;
- ei->version = (inode_peek_iversion_raw(dir) & 0xffffffff);
- ei->hint_femp.eidx = EXFAT_HINT_NONE;
- }
- /* search the file name for directories */
- dentry = exfat_find_dir_entry(sb, ei, &cdir, &uni_name,
- num_entries, TYPE_ALL);
- if (dentry < 0)
- return dentry; /* -error value */
- info->dir = cdir;
- info->entry = dentry;
- info->num_subdirs = 0;
- es = exfat_get_dentry_set(sb, &cdir, dentry, ES_2_ENTRIES);
- if (!es)
- return -EIO;
- ep = exfat_get_dentry_cached(es, 0);
- ep2 = exfat_get_dentry_cached(es, 1);
- info->type = exfat_get_entry_type(ep);
- info->attr = le16_to_cpu(ep->dentry.file.attr);
- info->size = le64_to_cpu(ep2->dentry.stream.valid_size);
- if ((info->type == TYPE_FILE) && (info->size == 0)) {
- info->flags = ALLOC_NO_FAT_CHAIN;
- info->start_clu = EXFAT_EOF_CLUSTER;
- } else {
- info->flags = ep2->dentry.stream.flags;
- info->start_clu =
- le32_to_cpu(ep2->dentry.stream.start_clu);
- }
- exfat_get_entry_time(sbi, &info->crtime,
- ep->dentry.file.create_tz,
- ep->dentry.file.create_time,
- ep->dentry.file.create_date,
- ep->dentry.file.create_time_cs);
- exfat_get_entry_time(sbi, &info->mtime,
- ep->dentry.file.modify_tz,
- ep->dentry.file.modify_time,
- ep->dentry.file.modify_date,
- ep->dentry.file.modify_time_cs);
- exfat_get_entry_time(sbi, &info->atime,
- ep->dentry.file.access_tz,
- ep->dentry.file.access_time,
- ep->dentry.file.access_date,
- 0);
- exfat_free_dentry_set(es, false);
- if (ei->start_clu == EXFAT_FREE_CLUSTER) {
- exfat_fs_error(sb,
- "non-zero size file starts with zero cluster (size : %llu, p_dir : %u, entry : 0x%08x)",
- i_size_read(dir), ei->dir.dir, ei->entry);
- return -EIO;
- }
- if (info->type == TYPE_DIR) {
- exfat_chain_set(&cdir, info->start_clu,
- EXFAT_B_TO_CLU(info->size, sbi), info->flags);
- count = exfat_count_dir_entries(sb, &cdir);
- if (count < 0)
- return -EIO;
- info->num_subdirs = count + EXFAT_MIN_SUBDIR;
- }
- return 0;
- }
- static int exfat_d_anon_disconn(struct dentry *dentry)
- {
- return IS_ROOT(dentry) && (dentry->d_flags & DCACHE_DISCONNECTED);
- }
- static struct dentry *exfat_lookup(struct inode *dir, struct dentry *dentry,
- unsigned int flags)
- {
- struct super_block *sb = dir->i_sb;
- struct inode *inode;
- struct dentry *alias;
- struct exfat_dir_entry info;
- int err;
- loff_t i_pos;
- mode_t i_mode;
- mutex_lock(&EXFAT_SB(sb)->s_lock);
- err = exfat_find(dir, &dentry->d_name, &info);
- if (err) {
- if (err == -ENOENT) {
- inode = NULL;
- goto out;
- }
- goto unlock;
- }
- i_pos = exfat_make_i_pos(&info);
- inode = exfat_build_inode(sb, &info, i_pos);
- err = PTR_ERR_OR_ZERO(inode);
- if (err)
- goto unlock;
- i_mode = inode->i_mode;
- alias = d_find_alias(inode);
- /*
- * Checking "alias->d_parent == dentry->d_parent" to make sure
- * FS is not corrupted (especially double linked dir).
- */
- if (alias && alias->d_parent == dentry->d_parent &&
- !exfat_d_anon_disconn(alias)) {
- /*
- * Unhashed alias is able to exist because of revalidate()
- * called by lookup_fast. You can easily make this status
- * by calling create and lookup concurrently
- * In such case, we reuse an alias instead of new dentry
- */
- if (d_unhashed(alias)) {
- WARN_ON(alias->d_name.hash_len !=
- dentry->d_name.hash_len);
- exfat_info(sb, "rehashed a dentry(%p) in read lookup",
- alias);
- d_drop(dentry);
- d_rehash(alias);
- } else if (!S_ISDIR(i_mode)) {
- /*
- * This inode has non anonymous-DCACHE_DISCONNECTED
- * dentry. This means, the user did ->lookup() by an
- * another name (longname vs 8.3 alias of it) in past.
- *
- * Switch to new one for reason of locality if possible.
- */
- d_move(alias, dentry);
- }
- iput(inode);
- mutex_unlock(&EXFAT_SB(sb)->s_lock);
- return alias;
- }
- dput(alias);
- out:
- mutex_unlock(&EXFAT_SB(sb)->s_lock);
- if (!inode)
- exfat_d_version_set(dentry, inode_query_iversion(dir));
- return d_splice_alias(inode, dentry);
- unlock:
- mutex_unlock(&EXFAT_SB(sb)->s_lock);
- return ERR_PTR(err);
- }
- /* remove an entry, BUT don't truncate */
- static int exfat_unlink(struct inode *dir, struct dentry *dentry)
- {
- struct exfat_chain cdir;
- struct exfat_dentry *ep;
- struct super_block *sb = dir->i_sb;
- struct inode *inode = dentry->d_inode;
- struct exfat_inode_info *ei = EXFAT_I(inode);
- struct buffer_head *bh;
- sector_t sector;
- int num_entries, entry, err = 0;
- mutex_lock(&EXFAT_SB(sb)->s_lock);
- exfat_chain_dup(&cdir, &ei->dir);
- entry = ei->entry;
- if (ei->dir.dir == DIR_DELETED) {
- exfat_err(sb, "abnormal access to deleted dentry");
- err = -ENOENT;
- goto unlock;
- }
- ep = exfat_get_dentry(sb, &cdir, entry, &bh, §or);
- if (!ep) {
- err = -EIO;
- goto unlock;
- }
- num_entries = exfat_count_ext_entries(sb, &cdir, entry, ep);
- if (num_entries < 0) {
- err = -EIO;
- brelse(bh);
- goto unlock;
- }
- num_entries++;
- brelse(bh);
- exfat_set_volume_dirty(sb);
- /* update the directory entry */
- if (exfat_remove_entries(dir, &cdir, entry, 0, num_entries)) {
- err = -EIO;
- goto unlock;
- }
- /* This doesn't modify ei */
- ei->dir.dir = DIR_DELETED;
- exfat_clear_volume_dirty(sb);
- inode_inc_iversion(dir);
- dir->i_mtime = dir->i_atime = current_time(dir);
- exfat_truncate_atime(&dir->i_atime);
- if (IS_DIRSYNC(dir))
- exfat_sync_inode(dir);
- else
- mark_inode_dirty(dir);
- clear_nlink(inode);
- inode->i_mtime = inode->i_atime = current_time(inode);
- exfat_truncate_atime(&inode->i_atime);
- exfat_unhash_inode(inode);
- exfat_d_version_set(dentry, inode_query_iversion(dir));
- unlock:
- mutex_unlock(&EXFAT_SB(sb)->s_lock);
- return err;
- }
- static int exfat_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
- {
- struct super_block *sb = dir->i_sb;
- struct inode *inode;
- struct exfat_dir_entry info;
- struct exfat_chain cdir;
- loff_t i_pos;
- int err;
- mutex_lock(&EXFAT_SB(sb)->s_lock);
- exfat_set_volume_dirty(sb);
- err = exfat_add_entry(dir, dentry->d_name.name, &cdir, TYPE_DIR,
- &info);
- exfat_clear_volume_dirty(sb);
- if (err)
- goto unlock;
- inode_inc_iversion(dir);
- dir->i_ctime = dir->i_mtime = current_time(dir);
- if (IS_DIRSYNC(dir))
- exfat_sync_inode(dir);
- else
- mark_inode_dirty(dir);
- inc_nlink(dir);
- i_pos = exfat_make_i_pos(&info);
- inode = exfat_build_inode(sb, &info, i_pos);
- err = PTR_ERR_OR_ZERO(inode);
- if (err)
- goto unlock;
- inode_inc_iversion(inode);
- inode->i_mtime = inode->i_atime = inode->i_ctime =
- EXFAT_I(inode)->i_crtime = current_time(inode);
- exfat_truncate_atime(&inode->i_atime);
- /* timestamp is already written, so mark_inode_dirty() is unneeded. */
- d_instantiate(dentry, inode);
- unlock:
- mutex_unlock(&EXFAT_SB(sb)->s_lock);
- return err;
- }
- static int exfat_check_dir_empty(struct super_block *sb,
- struct exfat_chain *p_dir)
- {
- int i, dentries_per_clu;
- unsigned int type;
- struct exfat_chain clu;
- struct exfat_dentry *ep;
- struct exfat_sb_info *sbi = EXFAT_SB(sb);
- struct buffer_head *bh;
- dentries_per_clu = sbi->dentries_per_clu;
- exfat_chain_dup(&clu, p_dir);
- while (clu.dir != EXFAT_EOF_CLUSTER) {
- for (i = 0; i < dentries_per_clu; i++) {
- ep = exfat_get_dentry(sb, &clu, i, &bh, NULL);
- if (!ep)
- return -EIO;
- type = exfat_get_entry_type(ep);
- brelse(bh);
- if (type == TYPE_UNUSED)
- return 0;
- if (type != TYPE_FILE && type != TYPE_DIR)
- continue;
- return -ENOTEMPTY;
- }
- if (clu.flags == ALLOC_NO_FAT_CHAIN) {
- if (--clu.size > 0)
- clu.dir++;
- else
- clu.dir = EXFAT_EOF_CLUSTER;
- } else {
- if (exfat_get_next_cluster(sb, &(clu.dir)))
- return -EIO;
- }
- }
- return 0;
- }
- static int exfat_rmdir(struct inode *dir, struct dentry *dentry)
- {
- struct inode *inode = dentry->d_inode;
- struct exfat_dentry *ep;
- struct exfat_chain cdir, clu_to_free;
- struct super_block *sb = inode->i_sb;
- struct exfat_sb_info *sbi = EXFAT_SB(sb);
- struct exfat_inode_info *ei = EXFAT_I(inode);
- struct buffer_head *bh;
- sector_t sector;
- int num_entries, entry, err;
- mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock);
- exfat_chain_dup(&cdir, &ei->dir);
- entry = ei->entry;
- if (ei->dir.dir == DIR_DELETED) {
- exfat_err(sb, "abnormal access to deleted dentry");
- err = -ENOENT;
- goto unlock;
- }
- exfat_chain_set(&clu_to_free, ei->start_clu,
- EXFAT_B_TO_CLU_ROUND_UP(i_size_read(inode), sbi), ei->flags);
- err = exfat_check_dir_empty(sb, &clu_to_free);
- if (err) {
- if (err == -EIO)
- exfat_err(sb, "failed to exfat_check_dir_empty : err(%d)",
- err);
- goto unlock;
- }
- ep = exfat_get_dentry(sb, &cdir, entry, &bh, §or);
- if (!ep) {
- err = -EIO;
- goto unlock;
- }
- num_entries = exfat_count_ext_entries(sb, &cdir, entry, ep);
- if (num_entries < 0) {
- err = -EIO;
- brelse(bh);
- goto unlock;
- }
- num_entries++;
- brelse(bh);
- exfat_set_volume_dirty(sb);
- err = exfat_remove_entries(dir, &cdir, entry, 0, num_entries);
- if (err) {
- exfat_err(sb, "failed to exfat_remove_entries : err(%d)", err);
- goto unlock;
- }
- ei->dir.dir = DIR_DELETED;
- exfat_clear_volume_dirty(sb);
- inode_inc_iversion(dir);
- dir->i_mtime = dir->i_atime = current_time(dir);
- exfat_truncate_atime(&dir->i_atime);
- if (IS_DIRSYNC(dir))
- exfat_sync_inode(dir);
- else
- mark_inode_dirty(dir);
- drop_nlink(dir);
- clear_nlink(inode);
- inode->i_mtime = inode->i_atime = current_time(inode);
- exfat_truncate_atime(&inode->i_atime);
- exfat_unhash_inode(inode);
- exfat_d_version_set(dentry, inode_query_iversion(dir));
- unlock:
- mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock);
- return err;
- }
- static int exfat_rename_file(struct inode *inode, struct exfat_chain *p_dir,
- int oldentry, struct exfat_uni_name *p_uniname,
- struct exfat_inode_info *ei)
- {
- int ret, num_old_entries, num_new_entries;
- sector_t sector_old, sector_new;
- struct exfat_dentry *epold, *epnew;
- struct super_block *sb = inode->i_sb;
- struct buffer_head *new_bh, *old_bh;
- int sync = IS_DIRSYNC(inode);
- epold = exfat_get_dentry(sb, p_dir, oldentry, &old_bh, §or_old);
- if (!epold)
- return -EIO;
- num_old_entries = exfat_count_ext_entries(sb, p_dir, oldentry, epold);
- if (num_old_entries < 0)
- return -EIO;
- num_old_entries++;
- num_new_entries = exfat_calc_num_entries(p_uniname);
- if (num_new_entries < 0)
- return num_new_entries;
- if (num_old_entries < num_new_entries) {
- int newentry;
- newentry =
- exfat_find_empty_entry(inode, p_dir, num_new_entries);
- if (newentry < 0)
- return newentry; /* -EIO or -ENOSPC */
- epnew = exfat_get_dentry(sb, p_dir, newentry, &new_bh,
- §or_new);
- if (!epnew)
- return -EIO;
- *epnew = *epold;
- if (exfat_get_entry_type(epnew) == TYPE_FILE) {
- epnew->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE);
- ei->attr |= ATTR_ARCHIVE;
- }
- exfat_update_bh(new_bh, sync);
- brelse(old_bh);
- brelse(new_bh);
- epold = exfat_get_dentry(sb, p_dir, oldentry + 1, &old_bh,
- §or_old);
- if (!epold)
- return -EIO;
- epnew = exfat_get_dentry(sb, p_dir, newentry + 1, &new_bh,
- §or_new);
- if (!epnew) {
- brelse(old_bh);
- return -EIO;
- }
- *epnew = *epold;
- exfat_update_bh(new_bh, sync);
- brelse(old_bh);
- brelse(new_bh);
- ret = exfat_init_ext_entry(inode, p_dir, newentry,
- num_new_entries, p_uniname);
- if (ret)
- return ret;
- exfat_remove_entries(inode, p_dir, oldentry, 0,
- num_old_entries);
- ei->entry = newentry;
- } else {
- if (exfat_get_entry_type(epold) == TYPE_FILE) {
- epold->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE);
- ei->attr |= ATTR_ARCHIVE;
- }
- exfat_update_bh(old_bh, sync);
- brelse(old_bh);
- ret = exfat_init_ext_entry(inode, p_dir, oldentry,
- num_new_entries, p_uniname);
- if (ret)
- return ret;
- exfat_remove_entries(inode, p_dir, oldentry, num_new_entries,
- num_old_entries);
- }
- return 0;
- }
- static int exfat_move_file(struct inode *inode, struct exfat_chain *p_olddir,
- int oldentry, struct exfat_chain *p_newdir,
- struct exfat_uni_name *p_uniname, struct exfat_inode_info *ei)
- {
- int ret, newentry, num_new_entries, num_old_entries;
- sector_t sector_mov, sector_new;
- struct exfat_dentry *epmov, *epnew;
- struct super_block *sb = inode->i_sb;
- struct buffer_head *mov_bh, *new_bh;
- epmov = exfat_get_dentry(sb, p_olddir, oldentry, &mov_bh, §or_mov);
- if (!epmov)
- return -EIO;
- num_old_entries = exfat_count_ext_entries(sb, p_olddir, oldentry,
- epmov);
- if (num_old_entries < 0)
- return -EIO;
- num_old_entries++;
- num_new_entries = exfat_calc_num_entries(p_uniname);
- if (num_new_entries < 0)
- return num_new_entries;
- newentry = exfat_find_empty_entry(inode, p_newdir, num_new_entries);
- if (newentry < 0)
- return newentry; /* -EIO or -ENOSPC */
- epnew = exfat_get_dentry(sb, p_newdir, newentry, &new_bh, §or_new);
- if (!epnew)
- return -EIO;
- *epnew = *epmov;
- if (exfat_get_entry_type(epnew) == TYPE_FILE) {
- epnew->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE);
- ei->attr |= ATTR_ARCHIVE;
- }
- exfat_update_bh(new_bh, IS_DIRSYNC(inode));
- brelse(mov_bh);
- brelse(new_bh);
- epmov = exfat_get_dentry(sb, p_olddir, oldentry + 1, &mov_bh,
- §or_mov);
- if (!epmov)
- return -EIO;
- epnew = exfat_get_dentry(sb, p_newdir, newentry + 1, &new_bh,
- §or_new);
- if (!epnew) {
- brelse(mov_bh);
- return -EIO;
- }
- *epnew = *epmov;
- exfat_update_bh(new_bh, IS_DIRSYNC(inode));
- brelse(mov_bh);
- brelse(new_bh);
- ret = exfat_init_ext_entry(inode, p_newdir, newentry, num_new_entries,
- p_uniname);
- if (ret)
- return ret;
- exfat_remove_entries(inode, p_olddir, oldentry, 0, num_old_entries);
- exfat_chain_set(&ei->dir, p_newdir->dir, p_newdir->size,
- p_newdir->flags);
- ei->entry = newentry;
- return 0;
- }
- static void exfat_update_parent_info(struct exfat_inode_info *ei,
- struct inode *parent_inode)
- {
- struct exfat_sb_info *sbi = EXFAT_SB(parent_inode->i_sb);
- struct exfat_inode_info *parent_ei = EXFAT_I(parent_inode);
- loff_t parent_isize = i_size_read(parent_inode);
- /*
- * the problem that struct exfat_inode_info caches wrong parent info.
- *
- * because of flag-mismatch of ei->dir,
- * there is abnormal traversing cluster chain.
- */
- if (unlikely(parent_ei->flags != ei->dir.flags ||
- parent_isize != EXFAT_CLU_TO_B(ei->dir.size, sbi) ||
- parent_ei->start_clu != ei->dir.dir)) {
- exfat_chain_set(&ei->dir, parent_ei->start_clu,
- EXFAT_B_TO_CLU_ROUND_UP(parent_isize, sbi),
- parent_ei->flags);
- }
- }
- /* rename or move a old file into a new file */
- static int __exfat_rename(struct inode *old_parent_inode,
- struct exfat_inode_info *ei, struct inode *new_parent_inode,
- struct dentry *new_dentry)
- {
- int ret;
- int dentry;
- struct exfat_chain olddir, newdir;
- struct exfat_chain *p_dir = NULL;
- struct exfat_uni_name uni_name;
- struct exfat_dentry *ep;
- struct super_block *sb = old_parent_inode->i_sb;
- struct exfat_sb_info *sbi = EXFAT_SB(sb);
- const unsigned char *new_path = new_dentry->d_name.name;
- struct inode *new_inode = new_dentry->d_inode;
- int num_entries;
- struct exfat_inode_info *new_ei = NULL;
- unsigned int new_entry_type = TYPE_UNUSED;
- int new_entry = 0;
- struct buffer_head *old_bh, *new_bh = NULL;
- /* check the validity of pointer parameters */
- if (new_path == NULL || strlen(new_path) == 0)
- return -EINVAL;
- if (ei->dir.dir == DIR_DELETED) {
- exfat_err(sb, "abnormal access to deleted source dentry");
- return -ENOENT;
- }
- exfat_update_parent_info(ei, old_parent_inode);
- exfat_chain_dup(&olddir, &ei->dir);
- dentry = ei->entry;
- ep = exfat_get_dentry(sb, &olddir, dentry, &old_bh, NULL);
- if (!ep) {
- ret = -EIO;
- goto out;
- }
- brelse(old_bh);
- /* check whether new dir is existing directory and empty */
- if (new_inode) {
- ret = -EIO;
- new_ei = EXFAT_I(new_inode);
- if (new_ei->dir.dir == DIR_DELETED) {
- exfat_err(sb, "abnormal access to deleted target dentry");
- goto out;
- }
- exfat_update_parent_info(new_ei, new_parent_inode);
- p_dir = &(new_ei->dir);
- new_entry = new_ei->entry;
- ep = exfat_get_dentry(sb, p_dir, new_entry, &new_bh, NULL);
- if (!ep)
- goto out;
- new_entry_type = exfat_get_entry_type(ep);
- brelse(new_bh);
- /* if new_inode exists, update ei */
- if (new_entry_type == TYPE_DIR) {
- struct exfat_chain new_clu;
- new_clu.dir = new_ei->start_clu;
- new_clu.size =
- EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode),
- sbi);
- new_clu.flags = new_ei->flags;
- ret = exfat_check_dir_empty(sb, &new_clu);
- if (ret)
- goto out;
- }
- }
- /* check the validity of directory name in the given new pathname */
- ret = exfat_resolve_path(new_parent_inode, new_path, &newdir,
- &uni_name);
- if (ret)
- goto out;
- exfat_set_volume_dirty(sb);
- if (olddir.dir == newdir.dir)
- ret = exfat_rename_file(new_parent_inode, &olddir, dentry,
- &uni_name, ei);
- else
- ret = exfat_move_file(new_parent_inode, &olddir, dentry,
- &newdir, &uni_name, ei);
- if (!ret && new_inode) {
- /* delete entries of new_dir */
- ep = exfat_get_dentry(sb, p_dir, new_entry, &new_bh, NULL);
- if (!ep) {
- ret = -EIO;
- goto del_out;
- }
- num_entries = exfat_count_ext_entries(sb, p_dir, new_entry, ep);
- if (num_entries < 0) {
- ret = -EIO;
- goto del_out;
- }
- brelse(new_bh);
- if (exfat_remove_entries(new_inode, p_dir, new_entry, 0,
- num_entries + 1)) {
- ret = -EIO;
- goto del_out;
- }
- /* Free the clusters if new_inode is a dir(as if exfat_rmdir) */
- if (new_entry_type == TYPE_DIR) {
- /* new_ei, new_clu_to_free */
- struct exfat_chain new_clu_to_free;
- exfat_chain_set(&new_clu_to_free, new_ei->start_clu,
- EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode),
- sbi), new_ei->flags);
- if (exfat_free_cluster(new_inode, &new_clu_to_free)) {
- /* just set I/O error only */
- ret = -EIO;
- }
- i_size_write(new_inode, 0);
- new_ei->start_clu = EXFAT_EOF_CLUSTER;
- new_ei->flags = ALLOC_NO_FAT_CHAIN;
- }
- del_out:
- /* Update new_inode ei
- * Prevent syncing removed new_inode
- * (new_ei is already initialized above code ("if (new_inode)")
- */
- new_ei->dir.dir = DIR_DELETED;
- }
- exfat_clear_volume_dirty(sb);
- out:
- return ret;
- }
- static int exfat_rename(struct inode *old_dir, struct dentry *old_dentry,
- struct inode *new_dir, struct dentry *new_dentry,
- unsigned int flags)
- {
- struct inode *old_inode, *new_inode;
- struct super_block *sb = old_dir->i_sb;
- loff_t i_pos;
- int err;
- /*
- * The VFS already checks for existence, so for local filesystems
- * the RENAME_NOREPLACE implementation is equivalent to plain rename.
- * Don't support any other flags
- */
- if (flags & ~RENAME_NOREPLACE)
- return -EINVAL;
- mutex_lock(&EXFAT_SB(sb)->s_lock);
- old_inode = old_dentry->d_inode;
- new_inode = new_dentry->d_inode;
- err = __exfat_rename(old_dir, EXFAT_I(old_inode), new_dir, new_dentry);
- if (err)
- goto unlock;
- inode_inc_iversion(new_dir);
- new_dir->i_ctime = new_dir->i_mtime = new_dir->i_atime =
- EXFAT_I(new_dir)->i_crtime = current_time(new_dir);
- exfat_truncate_atime(&new_dir->i_atime);
- if (IS_DIRSYNC(new_dir))
- exfat_sync_inode(new_dir);
- else
- mark_inode_dirty(new_dir);
- i_pos = ((loff_t)EXFAT_I(old_inode)->dir.dir << 32) |
- (EXFAT_I(old_inode)->entry & 0xffffffff);
- exfat_unhash_inode(old_inode);
- exfat_hash_inode(old_inode, i_pos);
- if (IS_DIRSYNC(new_dir))
- exfat_sync_inode(old_inode);
- else
- mark_inode_dirty(old_inode);
- if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) {
- drop_nlink(old_dir);
- if (!new_inode)
- inc_nlink(new_dir);
- }
- inode_inc_iversion(old_dir);
- old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
- if (IS_DIRSYNC(old_dir))
- exfat_sync_inode(old_dir);
- else
- mark_inode_dirty(old_dir);
- if (new_inode) {
- exfat_unhash_inode(new_inode);
- /* skip drop_nlink if new_inode already has been dropped */
- if (new_inode->i_nlink) {
- drop_nlink(new_inode);
- if (S_ISDIR(new_inode->i_mode))
- drop_nlink(new_inode);
- } else {
- exfat_warn(sb, "abnormal access to an inode dropped");
- WARN_ON(new_inode->i_nlink == 0);
- }
- new_inode->i_ctime = EXFAT_I(new_inode)->i_crtime =
- current_time(new_inode);
- }
- unlock:
- mutex_unlock(&EXFAT_SB(sb)->s_lock);
- return err;
- }
- const struct inode_operations exfat_dir_inode_operations = {
- .create = exfat_create,
- .lookup = exfat_lookup,
- .unlink = exfat_unlink,
- .mkdir = exfat_mkdir,
- .rmdir = exfat_rmdir,
- .rename = exfat_rename,
- .setattr = exfat_setattr,
- .getattr = exfat_getattr,
- };
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