forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
1380 lines
35 KiB
1380 lines
35 KiB
// 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 if necessary */ |
|
static unsigned int exfat_striptail_len(unsigned int len, const char *name, |
|
bool keep_last_dots) |
|
{ |
|
if (!keep_last_dots) { |
|
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, |
|
EXFAT_SB(sb)->options.keep_last_dots); |
|
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, |
|
EXFAT_SB(sb)->options.keep_last_dots); |
|
unsigned int blen = exfat_striptail_len(len, str, |
|
EXFAT_SB(sb)->options.keep_last_dots); |
|
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, |
|
EXFAT_SB(sb)->options.keep_last_dots); |
|
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, |
|
EXFAT_SB(sb)->options.keep_last_dots); |
|
unsigned int blen = exfat_striptail_len(len, str, |
|
EXFAT_SB(sb)->options.keep_last_dots); |
|
|
|
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); |
|
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; |
|
loff_t size = 0; |
|
struct exfat_chain clu; |
|
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, IS_DIRSYNC(inode)); |
|
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); |
|
|
|
/* 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); |
|
int pathlen = strlen(path); |
|
|
|
/* |
|
* get the length of the pathname excluding |
|
* trailing periods, if any. |
|
*/ |
|
namelen = exfat_striptail_len(pathlen, path, false); |
|
if (EXFAT_SB(sb)->options.keep_last_dots) { |
|
/* |
|
* Do not allow the creation of files with names |
|
* ending with period(s). |
|
*/ |
|
if (!lookup && (namelen < pathlen)) |
|
return -EINVAL; |
|
namelen = pathlen; |
|
} |
|
if (!namelen) |
|
return -ENOENT; |
|
if (pathlen > (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 (lossy & NLS_NAME_OVERLEN) ? -ENAMETOOLONG : -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 user_namespace *mnt_userns, 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); |
|
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; |
|
/* for optimized dir & entry to prevent long traverse of cluster chain */ |
|
struct exfat_hint hint_opt; |
|
|
|
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, &hint_opt); |
|
|
|
if (dentry < 0) |
|
return dentry; /* -error value */ |
|
|
|
info->dir = cdir; |
|
info->entry = dentry; |
|
info->num_subdirs = 0; |
|
|
|
/* adjust cdir to the optimized value */ |
|
cdir.dir = hint_opt.clu; |
|
if (cdir.flags & ALLOC_NO_FAT_CHAIN) |
|
cdir.size -= dentry / sbi->dentries_per_clu; |
|
dentry = hint_opt.eidx; |
|
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; |
|
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); |
|
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; |
|
|
|
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 user_namespace *mnt_userns, 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); |
|
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); |
|
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; |
|
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); |
|
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; |
|
|
|
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; |
|
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); |
|
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); |
|
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); |
|
if (!epold) |
|
return -EIO; |
|
epnew = exfat_get_dentry(sb, p_dir, newentry + 1, &new_bh); |
|
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->dir = *p_dir; |
|
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; |
|
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); |
|
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); |
|
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); |
|
if (!epmov) |
|
return -EIO; |
|
epnew = exfat_get_dentry(sb, p_newdir, newentry + 1, &new_bh); |
|
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; |
|
} |
|
|
|
/* 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_chain_set(&olddir, EXFAT_I(old_parent_inode)->start_clu, |
|
EXFAT_B_TO_CLU_ROUND_UP(i_size_read(old_parent_inode), sbi), |
|
EXFAT_I(old_parent_inode)->flags); |
|
dentry = ei->entry; |
|
|
|
ep = exfat_get_dentry(sb, &olddir, dentry, &old_bh); |
|
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; |
|
} |
|
|
|
p_dir = &(new_ei->dir); |
|
new_entry = new_ei->entry; |
|
ep = exfat_get_dentry(sb, p_dir, new_entry, &new_bh); |
|
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); |
|
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; |
|
} |
|
out: |
|
return ret; |
|
} |
|
|
|
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) |
|
{ |
|
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, |
|
};
|
|
|