2020-03-02 14:21:34 +08:00
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
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*/
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#include <linux/iversion.h>
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#include <linux/namei.h>
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#include <linux/slab.h>
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#include <linux/buffer_head.h>
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#include <linux/nls.h>
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#include "exfat_raw.h"
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#include "exfat_fs.h"
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static inline unsigned long exfat_d_version(struct dentry *dentry)
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{
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return (unsigned long) dentry->d_fsdata;
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}
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static inline void exfat_d_version_set(struct dentry *dentry,
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unsigned long version)
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{
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dentry->d_fsdata = (void *) version;
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}
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/*
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* If new entry was created in the parent, it could create the 8.3 alias (the
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* shortname of logname). So, the parent may have the negative-dentry which
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* matches the created 8.3 alias.
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*
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* If it happened, the negative dentry isn't actually negative anymore. So,
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* drop it.
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*/
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static int exfat_d_revalidate(struct dentry *dentry, unsigned int flags)
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{
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int ret;
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if (flags & LOOKUP_RCU)
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return -ECHILD;
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/*
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* This is not negative dentry. Always valid.
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*
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* Note, rename() to existing directory entry will have ->d_inode, and
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* will use existing name which isn't specified name by user.
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*
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* We may be able to drop this positive dentry here. But dropping
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* positive dentry isn't good idea. So it's unsupported like
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* rename("filename", "FILENAME") for now.
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*/
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if (d_really_is_positive(dentry))
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return 1;
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/*
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* Drop the negative dentry, in order to make sure to use the case
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* sensitive name which is specified by user if this is for creation.
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*/
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if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
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return 0;
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spin_lock(&dentry->d_lock);
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ret = inode_eq_iversion(d_inode(dentry->d_parent),
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exfat_d_version(dentry));
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spin_unlock(&dentry->d_lock);
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return ret;
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}
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/* returns the length of a struct qstr, ignoring trailing dots */
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static unsigned int exfat_striptail_len(unsigned int len, const char *name)
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{
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while (len && name[len - 1] == '.')
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len--;
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return len;
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}
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/*
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* Compute the hash for the exfat name corresponding to the dentry. If the name
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* is invalid, we leave the hash code unchanged so that the existing dentry can
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* be used. The exfat fs routines will return ENOENT or EINVAL as appropriate.
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*/
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static int exfat_d_hash(const struct dentry *dentry, struct qstr *qstr)
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{
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struct super_block *sb = dentry->d_sb;
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struct nls_table *t = EXFAT_SB(sb)->nls_io;
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const unsigned char *name = qstr->name;
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unsigned int len = exfat_striptail_len(qstr->len, qstr->name);
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unsigned long hash = init_name_hash(dentry);
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int i, charlen;
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wchar_t c;
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for (i = 0; i < len; i += charlen) {
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charlen = t->char2uni(&name[i], len - i, &c);
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if (charlen < 0)
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return charlen;
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hash = partial_name_hash(exfat_toupper(sb, c), hash);
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}
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qstr->hash = end_name_hash(hash);
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return 0;
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}
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static int exfat_d_cmp(const struct dentry *dentry, unsigned int len,
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const char *str, const struct qstr *name)
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{
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struct super_block *sb = dentry->d_sb;
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struct nls_table *t = EXFAT_SB(sb)->nls_io;
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unsigned int alen = exfat_striptail_len(name->len, name->name);
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unsigned int blen = exfat_striptail_len(len, str);
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wchar_t c1, c2;
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int charlen, i;
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if (alen != blen)
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return 1;
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for (i = 0; i < len; i += charlen) {
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charlen = t->char2uni(&name->name[i], alen - i, &c1);
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if (charlen < 0)
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return 1;
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if (charlen != t->char2uni(&str[i], blen - i, &c2))
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return 1;
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if (exfat_toupper(sb, c1) != exfat_toupper(sb, c2))
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return 1;
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}
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return 0;
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}
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const struct dentry_operations exfat_dentry_ops = {
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.d_revalidate = exfat_d_revalidate,
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.d_hash = exfat_d_hash,
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.d_compare = exfat_d_cmp,
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};
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static int exfat_utf8_d_hash(const struct dentry *dentry, struct qstr *qstr)
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{
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struct super_block *sb = dentry->d_sb;
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const unsigned char *name = qstr->name;
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unsigned int len = exfat_striptail_len(qstr->len, qstr->name);
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unsigned long hash = init_name_hash(dentry);
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int i, charlen;
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unicode_t u;
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for (i = 0; i < len; i += charlen) {
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charlen = utf8_to_utf32(&name[i], len - i, &u);
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if (charlen < 0)
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return charlen;
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/*
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* exfat_toupper() works only for code points up to the U+FFFF.
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*/
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2020-03-18 06:25:52 +08:00
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hash = partial_name_hash(u <= 0xFFFF ? exfat_toupper(sb, u) : u,
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hash);
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2020-03-02 14:21:34 +08:00
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}
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qstr->hash = end_name_hash(hash);
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return 0;
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}
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static int exfat_utf8_d_cmp(const struct dentry *dentry, unsigned int len,
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const char *str, const struct qstr *name)
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{
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struct super_block *sb = dentry->d_sb;
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unsigned int alen = exfat_striptail_len(name->len, name->name);
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unsigned int blen = exfat_striptail_len(len, str);
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unicode_t u_a, u_b;
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int charlen, i;
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if (alen != blen)
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return 1;
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for (i = 0; i < alen; i += charlen) {
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charlen = utf8_to_utf32(&name->name[i], alen - i, &u_a);
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if (charlen < 0)
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return 1;
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if (charlen != utf8_to_utf32(&str[i], blen - i, &u_b))
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return 1;
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if (u_a <= 0xFFFF && u_b <= 0xFFFF) {
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if (exfat_toupper(sb, u_a) != exfat_toupper(sb, u_b))
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return 1;
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} else {
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2020-03-18 05:34:33 +08:00
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if (u_a != u_b)
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return 1;
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2020-03-02 14:21:34 +08:00
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}
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}
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return 0;
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}
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const struct dentry_operations exfat_utf8_dentry_ops = {
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.d_revalidate = exfat_d_revalidate,
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.d_hash = exfat_utf8_d_hash,
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.d_compare = exfat_utf8_d_cmp,
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};
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/* used only in search empty_slot() */
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#define CNT_UNUSED_NOHIT (-1)
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#define CNT_UNUSED_HIT (-2)
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/* search EMPTY CONTINUOUS "num_entries" entries */
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static int exfat_search_empty_slot(struct super_block *sb,
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struct exfat_hint_femp *hint_femp, struct exfat_chain *p_dir,
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int num_entries)
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{
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int i, dentry, num_empty = 0;
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int dentries_per_clu;
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unsigned int type;
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struct exfat_chain clu;
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struct exfat_dentry *ep;
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struct exfat_sb_info *sbi = EXFAT_SB(sb);
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struct buffer_head *bh;
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dentries_per_clu = sbi->dentries_per_clu;
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if (hint_femp->eidx != EXFAT_HINT_NONE) {
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dentry = hint_femp->eidx;
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if (num_entries <= hint_femp->count) {
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hint_femp->eidx = EXFAT_HINT_NONE;
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return dentry;
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}
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exfat_chain_dup(&clu, &hint_femp->cur);
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} else {
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exfat_chain_dup(&clu, p_dir);
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dentry = 0;
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}
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while (clu.dir != EXFAT_EOF_CLUSTER) {
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i = dentry & (dentries_per_clu - 1);
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for (; i < dentries_per_clu; i++, dentry++) {
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ep = exfat_get_dentry(sb, &clu, i, &bh, NULL);
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if (!ep)
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return -EIO;
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type = exfat_get_entry_type(ep);
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brelse(bh);
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if (type == TYPE_UNUSED || type == TYPE_DELETED) {
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num_empty++;
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if (hint_femp->eidx == EXFAT_HINT_NONE) {
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hint_femp->eidx = dentry;
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hint_femp->count = CNT_UNUSED_NOHIT;
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exfat_chain_set(&hint_femp->cur,
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clu.dir, clu.size, clu.flags);
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}
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if (type == TYPE_UNUSED &&
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hint_femp->count != CNT_UNUSED_HIT)
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hint_femp->count = CNT_UNUSED_HIT;
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} else {
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if (hint_femp->eidx != EXFAT_HINT_NONE &&
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hint_femp->count == CNT_UNUSED_HIT) {
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/* unused empty group means
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* an empty group which includes
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* unused dentry
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*/
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exfat_fs_error(sb,
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"found bogus dentry(%d) beyond unused empty group(%d) (start_clu : %u, cur_clu : %u)",
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dentry, hint_femp->eidx,
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p_dir->dir, clu.dir);
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return -EIO;
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}
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num_empty = 0;
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hint_femp->eidx = EXFAT_HINT_NONE;
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}
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if (num_empty >= num_entries) {
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/* found and invalidate hint_femp */
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hint_femp->eidx = EXFAT_HINT_NONE;
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return (dentry - (num_entries - 1));
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}
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}
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if (clu.flags == ALLOC_NO_FAT_CHAIN) {
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if (--clu.size > 0)
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clu.dir++;
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else
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clu.dir = EXFAT_EOF_CLUSTER;
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} else {
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if (exfat_get_next_cluster(sb, &clu.dir))
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return -EIO;
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}
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}
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return -ENOSPC;
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}
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static int exfat_check_max_dentries(struct inode *inode)
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{
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if (EXFAT_B_TO_DEN(i_size_read(inode)) >= MAX_EXFAT_DENTRIES) {
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/*
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2020-08-14 10:03:46 +08:00
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* exFAT spec allows a dir to grow up to 8388608(256MB)
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2020-03-02 14:21:34 +08:00
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* dentries
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*/
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return -ENOSPC;
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}
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return 0;
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}
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/* find empty directory entry.
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* if there isn't any empty slot, expand cluster chain.
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*/
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static int exfat_find_empty_entry(struct inode *inode,
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struct exfat_chain *p_dir, int num_entries)
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{
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int dentry;
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unsigned int ret, last_clu;
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sector_t sector;
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loff_t size = 0;
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struct exfat_chain clu;
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struct exfat_dentry *ep = NULL;
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struct super_block *sb = inode->i_sb;
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struct exfat_sb_info *sbi = EXFAT_SB(sb);
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struct exfat_inode_info *ei = EXFAT_I(inode);
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struct exfat_hint_femp hint_femp;
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hint_femp.eidx = EXFAT_HINT_NONE;
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if (ei->hint_femp.eidx != EXFAT_HINT_NONE) {
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2020-09-11 12:45:19 +08:00
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hint_femp = ei->hint_femp;
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2020-03-02 14:21:34 +08:00
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ei->hint_femp.eidx = EXFAT_HINT_NONE;
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}
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while ((dentry = exfat_search_empty_slot(sb, &hint_femp, p_dir,
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num_entries)) < 0) {
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if (dentry == -EIO)
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break;
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if (exfat_check_max_dentries(inode))
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return -ENOSPC;
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/* we trust p_dir->size regardless of FAT type */
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if (exfat_find_last_cluster(sb, p_dir, &last_clu))
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return -EIO;
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/*
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* Allocate new cluster to this directory
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*/
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exfat_chain_set(&clu, last_clu + 1, 0, p_dir->flags);
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/* allocate a cluster */
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ret = exfat_alloc_cluster(inode, 1, &clu);
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if (ret)
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return ret;
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if (exfat_zeroed_cluster(inode, clu.dir))
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return -EIO;
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/* append to the FAT chain */
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if (clu.flags != p_dir->flags) {
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/* no-fat-chain bit is disabled,
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* so fat-chain should be synced with alloc-bitmap
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*/
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exfat_chain_cont_cluster(sb, p_dir->dir, p_dir->size);
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p_dir->flags = ALLOC_FAT_CHAIN;
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hint_femp.cur.flags = ALLOC_FAT_CHAIN;
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}
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|
|
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;
|
2020-06-16 10:18:07 +08:00
|
|
|
exfat_update_bh(bh, IS_DIRSYNC(inode));
|
2020-03-02 14:21:34 +08:00
|
|
|
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);
|
|
|
|
EXFAT_I(inode)->i_size_ondisk += sbi->cluster_size;
|
|
|
|
EXFAT_I(inode)->i_size_aligned += sbi->cluster_size;
|
|
|
|
EXFAT_I(inode)->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;
|
|
|
|
|
2020-09-11 12:45:19 +08:00
|
|
|
info->dir = *p_dir;
|
2020-03-02 14:21:34 +08:00
|
|
|
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;
|
2020-09-11 12:44:39 +08:00
|
|
|
info->num_subdirs = EXFAT_MIN_SUBDIR;
|
2020-03-02 14:21:34 +08:00
|
|
|
}
|
|
|
|
memset(&info->crtime, 0, sizeof(info->crtime));
|
|
|
|
memset(&info->mtime, 0, sizeof(info->mtime));
|
|
|
|
memset(&info->atime, 0, sizeof(info->atime));
|
|
|
|
out:
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2021-01-21 21:19:43 +08:00
|
|
|
static int exfat_create(struct user_namespace *mnt_userns, struct inode *dir,
|
|
|
|
struct dentry *dentry, umode_t mode, bool excl)
|
2020-03-02 14:21:34 +08:00
|
|
|
{
|
|
|
|
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);
|
2020-07-31 13:58:26 +08:00
|
|
|
exfat_set_volume_dirty(sb);
|
2020-03-02 14:21:34 +08:00
|
|
|
err = exfat_add_entry(dir, dentry->d_name.name, &cdir, TYPE_FILE,
|
|
|
|
&info);
|
2020-07-31 13:58:26 +08:00
|
|
|
exfat_clear_volume_dirty(sb);
|
2020-03-02 14:21:34 +08:00
|
|
|
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);
|
2020-08-26 09:18:29 +08:00
|
|
|
err = PTR_ERR_OR_ZERO(inode);
|
|
|
|
if (err)
|
2020-03-02 14:21:34 +08:00
|
|
|
goto unlock;
|
|
|
|
|
|
|
|
inode_inc_iversion(inode);
|
|
|
|
inode->i_mtime = inode->i_atime = inode->i_ctime =
|
|
|
|
EXFAT_I(inode)->i_crtime = current_time(inode);
|
2020-04-21 10:13:10 +08:00
|
|
|
exfat_truncate_atime(&inode->i_atime);
|
2020-03-02 14:21:34 +08:00
|
|
|
/* 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);
|
2020-09-02 15:53:06 +08:00
|
|
|
struct exfat_dentry *ep, *ep2;
|
|
|
|
struct exfat_entry_set_cache *es;
|
2020-03-02 14:21:34 +08:00
|
|
|
|
|
|
|
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);
|
|
|
|
|
2020-09-02 15:53:06 +08:00
|
|
|
if (dentry < 0)
|
2020-03-02 14:21:34 +08:00
|
|
|
return dentry; /* -error value */
|
|
|
|
|
2020-09-11 12:45:19 +08:00
|
|
|
info->dir = cdir;
|
2020-03-02 14:21:34 +08:00
|
|
|
info->entry = dentry;
|
|
|
|
info->num_subdirs = 0;
|
|
|
|
|
2020-09-02 15:53:06 +08:00
|
|
|
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);
|
|
|
|
}
|
2020-03-02 14:21:34 +08:00
|
|
|
|
2020-09-02 15:53:06 +08:00
|
|
|
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;
|
|
|
|
}
|
2020-03-02 14:21:34 +08:00
|
|
|
|
2020-09-02 15:53:06 +08:00
|
|
|
if (info->type == TYPE_DIR) {
|
|
|
|
exfat_chain_set(&cdir, info->start_clu,
|
|
|
|
EXFAT_B_TO_CLU(info->size, sbi), info->flags);
|
2020-03-02 14:21:34 +08:00
|
|
|
count = exfat_count_dir_entries(sb, &cdir);
|
|
|
|
if (count < 0)
|
|
|
|
return -EIO;
|
|
|
|
|
2020-09-02 15:53:06 +08:00
|
|
|
info->num_subdirs = count + EXFAT_MIN_SUBDIR;
|
2020-03-02 14:21:34 +08:00
|
|
|
}
|
|
|
|
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);
|
2020-08-26 09:18:29 +08:00
|
|
|
err = PTR_ERR_OR_ZERO(inode);
|
|
|
|
if (err)
|
2020-03-02 14:21:34 +08:00
|
|
|
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);
|
2020-04-24 12:31:12 +08:00
|
|
|
exfat_info(sb, "rehashed a dentry(%p) in read lookup",
|
|
|
|
alias);
|
2020-03-02 14:21:34 +08:00
|
|
|
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) {
|
2020-04-24 12:31:12 +08:00
|
|
|
exfat_err(sb, "abnormal access to deleted dentry");
|
2020-03-02 14:21:34 +08:00
|
|
|
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);
|
|
|
|
|
2020-07-31 13:58:26 +08:00
|
|
|
exfat_set_volume_dirty(sb);
|
2020-03-02 14:21:34 +08:00
|
|
|
/* 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;
|
2020-07-31 13:58:26 +08:00
|
|
|
exfat_clear_volume_dirty(sb);
|
2020-03-02 14:21:34 +08:00
|
|
|
|
|
|
|
inode_inc_iversion(dir);
|
|
|
|
dir->i_mtime = dir->i_atime = current_time(dir);
|
2020-04-21 10:13:10 +08:00
|
|
|
exfat_truncate_atime(&dir->i_atime);
|
2020-03-02 14:21:34 +08:00
|
|
|
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);
|
2020-04-21 10:13:10 +08:00
|
|
|
exfat_truncate_atime(&inode->i_atime);
|
2020-03-02 14:21:34 +08:00
|
|
|
exfat_unhash_inode(inode);
|
|
|
|
exfat_d_version_set(dentry, inode_query_iversion(dir));
|
|
|
|
unlock:
|
|
|
|
mutex_unlock(&EXFAT_SB(sb)->s_lock);
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
2021-01-21 21:19:43 +08:00
|
|
|
static int exfat_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
|
|
|
|
struct dentry *dentry, umode_t mode)
|
2020-03-02 14:21:34 +08:00
|
|
|
{
|
|
|
|
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);
|
2020-07-31 13:58:26 +08:00
|
|
|
exfat_set_volume_dirty(sb);
|
2020-03-02 14:21:34 +08:00
|
|
|
err = exfat_add_entry(dir, dentry->d_name.name, &cdir, TYPE_DIR,
|
|
|
|
&info);
|
2020-07-31 13:58:26 +08:00
|
|
|
exfat_clear_volume_dirty(sb);
|
2020-03-02 14:21:34 +08:00
|
|
|
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);
|
2020-08-26 09:18:29 +08:00
|
|
|
err = PTR_ERR_OR_ZERO(inode);
|
|
|
|
if (err)
|
2020-03-02 14:21:34 +08:00
|
|
|
goto unlock;
|
|
|
|
|
|
|
|
inode_inc_iversion(inode);
|
|
|
|
inode->i_mtime = inode->i_atime = inode->i_ctime =
|
|
|
|
EXFAT_I(inode)->i_crtime = current_time(inode);
|
2020-04-21 10:13:10 +08:00
|
|
|
exfat_truncate_atime(&inode->i_atime);
|
2020-03-02 14:21:34 +08:00
|
|
|
/* 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) {
|
2020-04-24 12:31:12 +08:00
|
|
|
exfat_err(sb, "abnormal access to deleted dentry");
|
2020-03-02 14:21:34 +08:00
|
|
|
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)
|
2020-04-24 12:31:12 +08:00
|
|
|
exfat_err(sb, "failed to exfat_check_dir_empty : err(%d)",
|
|
|
|
err);
|
2020-03-02 14:21:34 +08:00
|
|
|
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);
|
|
|
|
|
2020-07-31 13:58:26 +08:00
|
|
|
exfat_set_volume_dirty(sb);
|
2020-03-02 14:21:34 +08:00
|
|
|
err = exfat_remove_entries(dir, &cdir, entry, 0, num_entries);
|
|
|
|
if (err) {
|
2020-04-24 12:31:12 +08:00
|
|
|
exfat_err(sb, "failed to exfat_remove_entries : err(%d)", err);
|
2020-03-02 14:21:34 +08:00
|
|
|
goto unlock;
|
|
|
|
}
|
|
|
|
ei->dir.dir = DIR_DELETED;
|
2020-07-31 13:58:26 +08:00
|
|
|
exfat_clear_volume_dirty(sb);
|
2020-03-02 14:21:34 +08:00
|
|
|
|
|
|
|
inode_inc_iversion(dir);
|
|
|
|
dir->i_mtime = dir->i_atime = current_time(dir);
|
2020-04-21 10:13:10 +08:00
|
|
|
exfat_truncate_atime(&dir->i_atime);
|
2020-03-02 14:21:34 +08:00
|
|
|
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);
|
2020-04-21 10:13:10 +08:00
|
|
|
exfat_truncate_atime(&inode->i_atime);
|
2020-03-02 14:21:34 +08:00
|
|
|
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;
|
|
|
|
|
2020-09-11 12:45:19 +08:00
|
|
|
*epnew = *epold;
|
2020-03-02 14:21:34 +08:00
|
|
|
if (exfat_get_entry_type(epnew) == TYPE_FILE) {
|
|
|
|
epnew->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE);
|
|
|
|
ei->attr |= ATTR_ARCHIVE;
|
|
|
|
}
|
2020-06-16 10:18:07 +08:00
|
|
|
exfat_update_bh(new_bh, sync);
|
2020-03-02 14:21:34 +08:00
|
|
|
brelse(old_bh);
|
|
|
|
brelse(new_bh);
|
|
|
|
|
|
|
|
epold = exfat_get_dentry(sb, p_dir, oldentry + 1, &old_bh,
|
|
|
|
§or_old);
|
2020-06-11 01:22:13 +08:00
|
|
|
if (!epold)
|
|
|
|
return -EIO;
|
2020-03-02 14:21:34 +08:00
|
|
|
epnew = exfat_get_dentry(sb, p_dir, newentry + 1, &new_bh,
|
|
|
|
§or_new);
|
2020-06-11 01:22:13 +08:00
|
|
|
if (!epnew) {
|
|
|
|
brelse(old_bh);
|
2020-03-02 14:21:34 +08:00
|
|
|
return -EIO;
|
2020-06-11 01:22:13 +08:00
|
|
|
}
|
2020-03-02 14:21:34 +08:00
|
|
|
|
2020-09-11 12:45:19 +08:00
|
|
|
*epnew = *epold;
|
2020-06-16 10:18:07 +08:00
|
|
|
exfat_update_bh(new_bh, sync);
|
2020-03-02 14:21:34 +08:00
|
|
|
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;
|
|
|
|
}
|
2020-06-16 10:18:07 +08:00
|
|
|
exfat_update_bh(old_bh, sync);
|
2020-03-02 14:21:34 +08:00
|
|
|
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;
|
|
|
|
|
2020-09-11 12:45:19 +08:00
|
|
|
*epnew = *epmov;
|
2020-03-02 14:21:34 +08:00
|
|
|
if (exfat_get_entry_type(epnew) == TYPE_FILE) {
|
|
|
|
epnew->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE);
|
|
|
|
ei->attr |= ATTR_ARCHIVE;
|
|
|
|
}
|
2020-06-16 10:18:07 +08:00
|
|
|
exfat_update_bh(new_bh, IS_DIRSYNC(inode));
|
2020-03-02 14:21:34 +08:00
|
|
|
brelse(mov_bh);
|
|
|
|
brelse(new_bh);
|
|
|
|
|
|
|
|
epmov = exfat_get_dentry(sb, p_olddir, oldentry + 1, &mov_bh,
|
|
|
|
§or_mov);
|
2020-06-11 01:22:13 +08:00
|
|
|
if (!epmov)
|
|
|
|
return -EIO;
|
2020-03-02 14:21:34 +08:00
|
|
|
epnew = exfat_get_dentry(sb, p_newdir, newentry + 1, &new_bh,
|
|
|
|
§or_new);
|
2020-06-11 01:22:13 +08:00
|
|
|
if (!epnew) {
|
|
|
|
brelse(mov_bh);
|
2020-03-02 14:21:34 +08:00
|
|
|
return -EIO;
|
2020-06-11 01:22:13 +08:00
|
|
|
}
|
2020-03-02 14:21:34 +08:00
|
|
|
|
2020-09-11 12:45:19 +08:00
|
|
|
*epnew = *epmov;
|
2020-06-16 10:18:07 +08:00
|
|
|
exfat_update_bh(new_bh, IS_DIRSYNC(inode));
|
2020-03-02 14:21:34 +08:00
|
|
|
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) {
|
2020-04-24 12:31:12 +08:00
|
|
|
exfat_err(sb, "abnormal access to deleted source dentry");
|
2020-03-02 14:21:34 +08:00
|
|
|
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) {
|
2020-04-24 12:31:12 +08:00
|
|
|
exfat_err(sb, "abnormal access to deleted target dentry");
|
2020-03-02 14:21:34 +08:00
|
|
|
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;
|
|
|
|
|
2020-07-31 13:58:26 +08:00
|
|
|
exfat_set_volume_dirty(sb);
|
2020-03-02 14:21:34 +08:00
|
|
|
|
|
|
|
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;
|
|
|
|
}
|
2020-07-31 13:58:26 +08:00
|
|
|
exfat_clear_volume_dirty(sb);
|
2020-03-02 14:21:34 +08:00
|
|
|
out:
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2021-01-21 21:19:43 +08:00
|
|
|
static int exfat_rename(struct user_namespace *mnt_userns,
|
|
|
|
struct inode *old_dir, struct dentry *old_dentry,
|
|
|
|
struct inode *new_dir, struct dentry *new_dentry,
|
|
|
|
unsigned int flags)
|
2020-03-02 14:21:34 +08:00
|
|
|
{
|
|
|
|
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);
|
2020-04-21 10:13:10 +08:00
|
|
|
exfat_truncate_atime(&new_dir->i_atime);
|
2020-03-02 14:21:34 +08:00
|
|
|
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 {
|
2020-04-24 12:31:12 +08:00
|
|
|
exfat_warn(sb, "abnormal access to an inode dropped");
|
2020-03-02 14:21:34 +08:00
|
|
|
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,
|
|
|
|
};
|