// SPDX-License-Identifier: GPL-2.0/* * linux/fs/minix/dir.c * * Copyright (C) 1991, 1992 Linus Torvalds * * minix directory handling functions * * Updated to filesystem version 3 by Daniel Aragones */ #include "minix.h"#include <linux/buffer_head.h>#include <linux/highmem.h>#include <linux/swap.h> typedef struct minix_dir_entry minix_dirent;typedef struct minix3_dir_entry minix3_dirent; static int minix_readdir(struct file *, struct dir_context *); const struct file_operations minix_dir_operations = { .llseek = generic_file_llseek, .read = generic_read_dir, .iterate_shared = minix_readdir, .fsync = simple_fsync,}; /* * Return the offset into page `page_nr' of the last valid * byte in that page, plus one. */static unsignedminix_last_byte(struct inode *inode, unsigned long page_nr){ unsigned last_byte = PAGE_SIZE; if (page_nr == (inode->i_size >> PAGE_SHIFT)) last_byte = inode->i_size & (PAGE_SIZE - 1); return last_byte;} static void dir_commit_chunk(struct folio *folio, loff_t pos, unsigned len){ struct address_space *mapping = folio->mapping; struct inode *dir = mapping->host; block_write_end(pos, len, len, folio); if (pos+len > dir->i_size) { i_size_write(dir, pos+len); mark_inode_dirty(dir); } folio_unlock(folio);} static int minix_handle_dirsync(struct inode *dir){ int err; err = filemap_write_and_wait(dir->i_mapping); if (!err) err = sync_inode_metadata(dir, 1); return err;} static void *dir_get_folio(struct inode *dir, unsigned long n, struct folio **foliop){ struct folio *folio = read_mapping_folio(dir->i_mapping, n, NULL); if (IS_ERR(folio)) return ERR_CAST(folio); *foliop = folio; return kmap_local_folio(folio, 0);} static inline void *minix_next_entry(void *de, struct minix_sb_info *sbi){ return (void*)((char*)de + sbi->s_dirsize);} static int minix_readdir(struct file *file, struct dir_context *ctx){ struct inode *inode = file_inode(file); struct super_block *sb = inode->i_sb; struct minix_sb_info *sbi = minix_sb(sb); unsigned chunk_size = sbi->s_dirsize; unsigned long npages = dir_pages(inode); unsigned long pos = ctx->pos; unsigned offset; unsigned long n; ctx->pos = pos = ALIGN(pos, chunk_size); if (pos >= inode->i_size) return 0; offset = pos & ~PAGE_MASK; n = pos >> PAGE_SHIFT; for ( ; n < npages; n++, offset = 0) { char *p, *kaddr, *limit; struct folio *folio; kaddr = dir_get_folio(inode, n, &folio); if (IS_ERR(kaddr)) continue; p = kaddr+offset; limit = kaddr + minix_last_byte(inode, n) - chunk_size; for ( ; p <= limit; p = minix_next_entry(p, sbi)) { const char *name; __u32 inumber; if (sbi->s_version == MINIX_V3) { minix3_dirent *de3 = (minix3_dirent *)p; name = de3->name; inumber = de3->inode; } else { minix_dirent *de = (minix_dirent *)p; name = de->name; inumber = de->inode; } if (inumber) { unsigned l = strnlen(name, sbi->s_namelen); if (!dir_emit(ctx, name, l, inumber, DT_UNKNOWN)) { folio_release_kmap(folio, p); return 0; } } ctx->pos += chunk_size; } folio_release_kmap(folio, kaddr); } return 0;} static inline int namecompare(int len, int maxlen, const char * name, const char * buffer){ if (len < maxlen && buffer[len]) return 0; return !memcmp(name, buffer, len);} /* * minix_find_entry() * * finds an entry in the specified directory with the wanted name. * It does NOT read the inode of the * entry - you'll have to do that yourself if you want to. * * On Success folio_release_kmap() should be called on *foliop. */minix_dirent *minix_find_entry(struct dentry *dentry, struct folio **foliop){ const char * name = dentry->d_name.name; int namelen = dentry->d_name.len; struct inode * dir = d_inode(dentry->d_parent); struct super_block * sb = dir->i_sb; struct minix_sb_info * sbi = minix_sb(sb); unsigned long n; unsigned long npages = dir_pages(dir); char *p; char *namx; __u32 inumber; for (n = 0; n < npages; n++) { char *kaddr, *limit; kaddr = dir_get_folio(dir, n, foliop); if (IS_ERR(kaddr)) continue; limit = kaddr + minix_last_byte(dir, n) - sbi->s_dirsize; for (p = kaddr; p <= limit; p = minix_next_entry(p, sbi)) { if (sbi->s_version == MINIX_V3) { minix3_dirent *de3 = (minix3_dirent *)p; namx = de3->name; inumber = de3->inode; } else { minix_dirent *de = (minix_dirent *)p; namx = de->name; inumber = de->inode; } if (!inumber) continue; if (namecompare(namelen, sbi->s_namelen, name, namx)) goto found; } folio_release_kmap(*foliop, kaddr); } return NULL; found: return (minix_dirent *)p;} int minix_add_link(struct dentry *dentry, struct inode *inode){ struct inode *dir = d_inode(dentry->d_parent); const char * name = dentry->d_name.name; int namelen = dentry->d_name.len; struct super_block * sb = dir->i_sb; struct minix_sb_info * sbi = minix_sb(sb); struct folio *folio = NULL; unsigned long npages = dir_pages(dir); unsigned long n; char *kaddr, *p; minix_dirent *de; minix3_dirent *de3; loff_t pos; int err; char *namx = NULL; __u32 inumber; /* * We take care of directory expansion in the same loop * This code plays outside i_size, so it locks the page * to protect that region. */ for (n = 0; n <= npages; n++) { char *limit, *dir_end; kaddr = dir_get_folio(dir, n, &folio); if (IS_ERR(kaddr)) return PTR_ERR(kaddr); folio_lock(folio); dir_end = kaddr + minix_last_byte(dir, n); limit = kaddr + PAGE_SIZE - sbi->s_dirsize; for (p = kaddr; p <= limit; p = minix_next_entry(p, sbi)) { de = (minix_dirent *)p; de3 = (minix3_dirent *)p; if (sbi->s_version == MINIX_V3) { namx = de3->name; inumber = de3->inode; } else { namx = de->name; inumber = de->inode; } if (p == dir_end) { /* We hit i_size */ if (sbi->s_version == MINIX_V3) de3->inode = 0; else de->inode = 0; goto got_it; } if (!inumber) goto got_it; err = -EEXIST; if (namecompare(namelen, sbi->s_namelen, name, namx)) goto out_unlock; } folio_unlock(folio); folio_release_kmap(folio, kaddr); } BUG(); return -EINVAL; got_it: pos = folio_pos(folio) + offset_in_folio(folio, p); err = minix_prepare_chunk(folio, pos, sbi->s_dirsize); if (err) goto out_unlock; memcpy (namx, name, namelen); if (sbi->s_version == MINIX_V3) { memset (namx + namelen, 0, sbi->s_dirsize - namelen - 4); de3->inode = inode->i_ino; } else { memset (namx + namelen, 0, sbi->s_dirsize - namelen - 2); de->inode = inode->i_ino; } dir_commit_chunk(folio, pos, sbi->s_dirsize); inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir)); mark_inode_dirty(dir); err = minix_handle_dirsync(dir);out_put: folio_release_kmap(folio, kaddr); return err;out_unlock: folio_unlock(folio); goto out_put;} int minix_delete_entry(struct minix_dir_entry *de, struct folio *folio){ struct inode *inode = folio->mapping->host; loff_t pos = folio_pos(folio) + offset_in_folio(folio, de); struct minix_sb_info *sbi = minix_sb(inode->i_sb); unsigned len = sbi->s_dirsize; int err; folio_lock(folio); err = minix_prepare_chunk(folio, pos, len); if (err) { folio_unlock(folio); return err; } if (sbi->s_version == MINIX_V3) ((minix3_dirent *)de)->inode = 0; else de->inode = 0; dir_commit_chunk(folio, pos, len); inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode)); mark_inode_dirty(inode); return minix_handle_dirsync(inode);} int minix_make_empty(struct inode *inode, struct inode *dir){ struct folio *folio = filemap_grab_folio(inode->i_mapping, 0); struct minix_sb_info *sbi = minix_sb(inode->i_sb); char *kaddr; int err; if (IS_ERR(folio)) return PTR_ERR(folio); err = minix_prepare_chunk(folio, 0, 2 * sbi->s_dirsize); if (err) { folio_unlock(folio); goto fail; } kaddr = kmap_local_folio(folio, 0); memset(kaddr, 0, folio_size(folio)); if (sbi->s_version == MINIX_V3) { minix3_dirent *de3 = (minix3_dirent *)kaddr; de3->inode = inode->i_ino; strcpy(de3->name, "."); de3 = minix_next_entry(de3, sbi); de3->inode = dir->i_ino; strcpy(de3->name, ".."); } else { minix_dirent *de = (minix_dirent *)kaddr; de->inode = inode->i_ino; strcpy(de->name, "."); de = minix_next_entry(de, sbi); de->inode = dir->i_ino; strcpy(de->name, ".."); } kunmap_local(kaddr); dir_commit_chunk(folio, 0, 2 * sbi->s_dirsize); err = minix_handle_dirsync(inode);fail: folio_put(folio); return err;} /* * routine to check that the specified directory is empty (for rmdir) */int minix_empty_dir(struct inode * inode){ struct folio *folio = NULL; unsigned long i, npages = dir_pages(inode); struct minix_sb_info *sbi = minix_sb(inode->i_sb); char *name, *kaddr; __u32 inumber; for (i = 0; i < npages; i++) { char *p, *limit; kaddr = dir_get_folio(inode, i, &folio); if (IS_ERR(kaddr)) continue; limit = kaddr + minix_last_byte(inode, i) - sbi->s_dirsize; for (p = kaddr; p <= limit; p = minix_next_entry(p, sbi)) { if (sbi->s_version == MINIX_V3) { minix3_dirent *de3 = (minix3_dirent *)p; name = de3->name; inumber = de3->inode; } else { minix_dirent *de = (minix_dirent *)p; name = de->name; inumber = de->inode; } if (inumber != 0) { /* check for . and .. */ if (name[0] != '.') goto not_empty; if (!name[1]) { if (inumber != inode->i_ino) goto not_empty; } else if (name[1] != '.') goto not_empty; else if (name[2]) goto not_empty; } } folio_release_kmap(folio, kaddr); } return 1; not_empty: folio_release_kmap(folio, kaddr); return 0;} /* Releases the page */int minix_set_link(struct minix_dir_entry *de, struct folio *folio, struct inode *inode){ struct inode *dir = folio->mapping->host; struct minix_sb_info *sbi = minix_sb(dir->i_sb); loff_t pos = folio_pos(folio) + offset_in_folio(folio, de); int err; folio_lock(folio); err = minix_prepare_chunk(folio, pos, sbi->s_dirsize); if (err) { folio_unlock(folio); return err; } if (sbi->s_version == MINIX_V3) ((minix3_dirent *)de)->inode = inode->i_ino; else de->inode = inode->i_ino; dir_commit_chunk(folio, pos, sbi->s_dirsize); inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir)); mark_inode_dirty(dir); return minix_handle_dirsync(dir);} struct minix_dir_entry *minix_dotdot(struct inode *dir, struct folio **foliop){ struct minix_sb_info *sbi = minix_sb(dir->i_sb); struct minix_dir_entry *de = dir_get_folio(dir, 0, foliop); if (!IS_ERR(de)) return minix_next_entry(de, sbi); return NULL;} ino_t minix_inode_by_name(struct dentry *dentry){ struct folio *folio; struct minix_dir_entry *de = minix_find_entry(dentry, &folio); ino_t res = 0; if (de) { struct inode *inode = folio->mapping->host; struct minix_sb_info *sbi = minix_sb(inode->i_sb); if (sbi->s_version == MINIX_V3) res = ((minix3_dirent *) de)->inode; else res = de->inode; folio_release_kmap(folio, de); } return res;}
// SPDX-License-Identifier: GPL-2.0
/*
* linux/fs/minix/dir.c
*
* Copyright (C) 1991, 1992 Linus Torvalds
*
* minix directory handling functions
*
* Updated to filesystem version 3 by Daniel Aragones
*/
#include "minix.h"
#include <linux/buffer_head.h>
#include <linux/highmem.h>
#include <linux/swap.h>
typedef struct minix_dir_entry minix_dirent;
typedef struct minix3_dir_entry minix3_dirent;
static int minix_readdir(struct file *, struct dir_context *);
const struct file_operations minix_dir_operations = {
.llseek = generic_file_llseek,
.read = generic_read_dir,
.iterate_shared = minix_readdir,
.fsync = simple_fsync,
};
/*
* Return the offset into page `page_nr' of the last valid
* byte in that page, plus one.
*/
static unsigned
minix_last_byte(struct inode *inode, unsigned long page_nr)
{
unsigned last_byte = PAGE_SIZE;
if (page_nr == (inode->i_size >> PAGE_SHIFT))
last_byte = inode->i_size & (PAGE_SIZE - 1);
return last_byte;
}
static void dir_commit_chunk(struct folio *folio, loff_t pos, unsigned len)
{
struct address_space *mapping = folio->mapping;
struct inode *dir = mapping->host;
block_write_end(pos, len, len, folio);
if (pos+len > dir->i_size) {
i_size_write(dir, pos+len);
mark_inode_dirty(dir);
}
folio_unlock(folio);
}
static int minix_handle_dirsync(struct inode *dir)
{
int err;
err = filemap_write_and_wait(dir->i_mapping);
if (!err)
err = sync_inode_metadata(dir, 1);
return err;
}
static void *dir_get_folio(struct inode *dir, unsigned long n,
struct folio **foliop)
{
struct folio *folio = read_mapping_folio(dir->i_mapping, n, NULL);
if (IS_ERR(folio))
return ERR_CAST(folio);
*foliop = folio;
return kmap_local_folio(folio, 0);
}
static inline void *minix_next_entry(void *de, struct minix_sb_info *sbi)
{
return (void*)((char*)de + sbi->s_dirsize);
}
static int minix_readdir(struct file *file, struct dir_context *ctx)
{
struct inode *inode = file_inode(file);
struct super_block *sb = inode->i_sb;
struct minix_sb_info *sbi = minix_sb(sb);
unsigned chunk_size = sbi->s_dirsize;
unsigned long npages = dir_pages(inode);
unsigned long pos = ctx->pos;
unsigned offset;
unsigned long n;
ctx->pos = pos = ALIGN(pos, chunk_size);
if (pos >= inode->i_size)
return 0;
offset = pos & ~PAGE_MASK;
n = pos >> PAGE_SHIFT;
for ( ; n < npages; n++, offset = 0) {
char *p, *kaddr, *limit;
struct folio *folio;
kaddr = dir_get_folio(inode, n, &folio);
if (IS_ERR(kaddr))
continue;
p = kaddr+offset;
limit = kaddr + minix_last_byte(inode, n) - chunk_size;
for ( ; p <= limit; p = minix_next_entry(p, sbi)) {
const char *name;
__u32 inumber;
if (sbi->s_version == MINIX_V3) {
minix3_dirent *de3 = (minix3_dirent *)p;
name = de3->name;
inumber = de3->inode;
} else {
minix_dirent *de = (minix_dirent *)p;
name = de->name;
inumber = de->inode;
}
if (inumber) {
unsigned l = strnlen(name, sbi->s_namelen);
if (!dir_emit(ctx, name, l,
inumber, DT_UNKNOWN)) {
folio_release_kmap(folio, p);
return 0;
}
}
ctx->pos += chunk_size;
}
folio_release_kmap(folio, kaddr);
}
return 0;
}
static inline int namecompare(int len, int maxlen,
const char * name, const char * buffer)
{
if (len < maxlen && buffer[len])
return 0;
return !memcmp(name, buffer, len);
}
/*
* minix_find_entry()
*
* finds an entry in the specified directory with the wanted name.
* It does NOT read the inode of the
* entry - you'll have to do that yourself if you want to.
*
* On Success folio_release_kmap() should be called on *foliop.
*/
minix_dirent *minix_find_entry(struct dentry *dentry, struct folio **foliop)
{
const char * name = dentry->d_name.name;
int namelen = dentry->d_name.len;
struct inode * dir = d_inode(dentry->d_parent);
struct super_block * sb = dir->i_sb;
struct minix_sb_info * sbi = minix_sb(sb);
unsigned long n;
unsigned long npages = dir_pages(dir);
char *p;
char *namx;
__u32 inumber;
for (n = 0; n < npages; n++) {
char *kaddr, *limit;
kaddr = dir_get_folio(dir, n, foliop);
if (IS_ERR(kaddr))
continue;
limit = kaddr + minix_last_byte(dir, n) - sbi->s_dirsize;
for (p = kaddr; p <= limit; p = minix_next_entry(p, sbi)) {
if (sbi->s_version == MINIX_V3) {
minix3_dirent *de3 = (minix3_dirent *)p;
namx = de3->name;
inumber = de3->inode;
} else {
minix_dirent *de = (minix_dirent *)p;
namx = de->name;
inumber = de->inode;
}
if (!inumber)
continue;
if (namecompare(namelen, sbi->s_namelen, name, namx))
goto found;
}
folio_release_kmap(*foliop, kaddr);
}
return NULL;
found:
return (minix_dirent *)p;
}
int minix_add_link(struct dentry *dentry, struct inode *inode)
{
struct inode *dir = d_inode(dentry->d_parent);
const char * name = dentry->d_name.name;
int namelen = dentry->d_name.len;
struct super_block * sb = dir->i_sb;
struct minix_sb_info * sbi = minix_sb(sb);
struct folio *folio = NULL;
unsigned long npages = dir_pages(dir);
unsigned long n;
char *kaddr, *p;
minix_dirent *de;
minix3_dirent *de3;
loff_t pos;
int err;
char *namx = NULL;
__u32 inumber;
/*
* We take care of directory expansion in the same loop
* This code plays outside i_size, so it locks the page
* to protect that region.
*/
for (n = 0; n <= npages; n++) {
char *limit, *dir_end;
kaddr = dir_get_folio(dir, n, &folio);
if (IS_ERR(kaddr))
return PTR_ERR(kaddr);
folio_lock(folio);
dir_end = kaddr + minix_last_byte(dir, n);
limit = kaddr + PAGE_SIZE - sbi->s_dirsize;
for (p = kaddr; p <= limit; p = minix_next_entry(p, sbi)) {
de = (minix_dirent *)p;
de3 = (minix3_dirent *)p;
if (sbi->s_version == MINIX_V3) {
namx = de3->name;
inumber = de3->inode;
} else {
namx = de->name;
inumber = de->inode;
}
if (p == dir_end) {
/* We hit i_size */
if (sbi->s_version == MINIX_V3)
de3->inode = 0;
else
de->inode = 0;
goto got_it;
}
if (!inumber)
goto got_it;
err = -EEXIST;
if (namecompare(namelen, sbi->s_namelen, name, namx))
goto out_unlock;
}
folio_unlock(folio);
folio_release_kmap(folio, kaddr);
}
BUG();
return -EINVAL;
got_it:
pos = folio_pos(folio) + offset_in_folio(folio, p);
err = minix_prepare_chunk(folio, pos, sbi->s_dirsize);
if (err)
goto out_unlock;
memcpy (namx, name, namelen);
if (sbi->s_version == MINIX_V3) {
memset (namx + namelen, 0, sbi->s_dirsize - namelen - 4);
de3->inode = inode->i_ino;
} else {
memset (namx + namelen, 0, sbi->s_dirsize - namelen - 2);
de->inode = inode->i_ino;
}
dir_commit_chunk(folio, pos, sbi->s_dirsize);
inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
mark_inode_dirty(dir);
err = minix_handle_dirsync(dir);
out_put:
folio_release_kmap(folio, kaddr);
return err;
out_unlock:
folio_unlock(folio);
goto out_put;
}
int minix_delete_entry(struct minix_dir_entry *de, struct folio *folio)
{
struct inode *inode = folio->mapping->host;
loff_t pos = folio_pos(folio) + offset_in_folio(folio, de);
struct minix_sb_info *sbi = minix_sb(inode->i_sb);
unsigned len = sbi->s_dirsize;
int err;
folio_lock(folio);
err = minix_prepare_chunk(folio, pos, len);
if (err) {
folio_unlock(folio);
return err;
}
if (sbi->s_version == MINIX_V3)
((minix3_dirent *)de)->inode = 0;
else
de->inode = 0;
dir_commit_chunk(folio, pos, len);
inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
mark_inode_dirty(inode);
return minix_handle_dirsync(inode);
}
int minix_make_empty(struct inode *inode, struct inode *dir)
{
struct folio *folio = filemap_grab_folio(inode->i_mapping, 0);
struct minix_sb_info *sbi = minix_sb(inode->i_sb);
char *kaddr;
int err;
if (IS_ERR(folio))
return PTR_ERR(folio);
err = minix_prepare_chunk(folio, 0, 2 * sbi->s_dirsize);
if (err) {
folio_unlock(folio);
goto fail;
}
kaddr = kmap_local_folio(folio, 0);
memset(kaddr, 0, folio_size(folio));
if (sbi->s_version == MINIX_V3) {
minix3_dirent *de3 = (minix3_dirent *)kaddr;
de3->inode = inode->i_ino;
strcpy(de3->name, ".");
de3 = minix_next_entry(de3, sbi);
de3->inode = dir->i_ino;
strcpy(de3->name, "..");
} else {
minix_dirent *de = (minix_dirent *)kaddr;
de->inode = inode->i_ino;
strcpy(de->name, ".");
de = minix_next_entry(de, sbi);
de->inode = dir->i_ino;
strcpy(de->name, "..");
}
kunmap_local(kaddr);
dir_commit_chunk(folio, 0, 2 * sbi->s_dirsize);
err = minix_handle_dirsync(inode);
fail:
folio_put(folio);
return err;
}
/*
* routine to check that the specified directory is empty (for rmdir)
*/
int minix_empty_dir(struct inode * inode)
{
struct folio *folio = NULL;
unsigned long i, npages = dir_pages(inode);
struct minix_sb_info *sbi = minix_sb(inode->i_sb);
char *name, *kaddr;
__u32 inumber;
for (i = 0; i < npages; i++) {
char *p, *limit;
kaddr = dir_get_folio(inode, i, &folio);
if (IS_ERR(kaddr))
continue;
limit = kaddr + minix_last_byte(inode, i) - sbi->s_dirsize;
for (p = kaddr; p <= limit; p = minix_next_entry(p, sbi)) {
if (sbi->s_version == MINIX_V3) {
minix3_dirent *de3 = (minix3_dirent *)p;
name = de3->name;
inumber = de3->inode;
} else {
minix_dirent *de = (minix_dirent *)p;
name = de->name;
inumber = de->inode;
}
if (inumber != 0) {
/* check for . and .. */
if (name[0] != '.')
goto not_empty;
if (!name[1]) {
if (inumber != inode->i_ino)
goto not_empty;
} else if (name[1] != '.')
goto not_empty;
else if (name[2])
goto not_empty;
}
}
folio_release_kmap(folio, kaddr);
}
return 1;
not_empty:
folio_release_kmap(folio, kaddr);
return 0;
}
/* Releases the page */
int minix_set_link(struct minix_dir_entry *de, struct folio *folio,
struct inode *inode)
{
struct inode *dir = folio->mapping->host;
struct minix_sb_info *sbi = minix_sb(dir->i_sb);
loff_t pos = folio_pos(folio) + offset_in_folio(folio, de);
int err;
folio_lock(folio);
err = minix_prepare_chunk(folio, pos, sbi->s_dirsize);
if (err) {
folio_unlock(folio);
return err;
}
if (sbi->s_version == MINIX_V3)
((minix3_dirent *)de)->inode = inode->i_ino;
else
de->inode = inode->i_ino;
dir_commit_chunk(folio, pos, sbi->s_dirsize);
inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
mark_inode_dirty(dir);
return minix_handle_dirsync(dir);
}
struct minix_dir_entry *minix_dotdot(struct inode *dir, struct folio **foliop)
{
struct minix_sb_info *sbi = minix_sb(dir->i_sb);
struct minix_dir_entry *de = dir_get_folio(dir, 0, foliop);
if (!IS_ERR(de))
return minix_next_entry(de, sbi);
return NULL;
}
ino_t minix_inode_by_name(struct dentry *dentry)
{
struct folio *folio;
struct minix_dir_entry *de = minix_find_entry(dentry, &folio);
ino_t res = 0;
if (de) {
struct inode *inode = folio->mapping->host;
struct minix_sb_info *sbi = minix_sb(inode->i_sb);
if (sbi->s_version == MINIX_V3)
res = ((minix3_dirent *) de)->inode;
else
res = de->inode;
folio_release_kmap(folio, de);
}
return res;
}