![Al Viro](/assets/img/avatar_default.png)
vfs_create() ignores everything outside of 16bit subset of its mode argument; switching it to umode_t is obviously equivalent and it's the only caller of the method Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
459 lines
11 KiB
C
459 lines
11 KiB
C
/*
|
|
* linux/fs/affs/namei.c
|
|
*
|
|
* (c) 1996 Hans-Joachim Widmaier - Rewritten
|
|
*
|
|
* (C) 1993 Ray Burr - Modified for Amiga FFS filesystem.
|
|
*
|
|
* (C) 1991 Linus Torvalds - minix filesystem
|
|
*/
|
|
|
|
#include "affs.h"
|
|
|
|
typedef int (*toupper_t)(int);
|
|
|
|
static int affs_toupper(int ch);
|
|
static int affs_hash_dentry(const struct dentry *,
|
|
const struct inode *, struct qstr *);
|
|
static int affs_compare_dentry(const struct dentry *parent,
|
|
const struct inode *pinode,
|
|
const struct dentry *dentry, const struct inode *inode,
|
|
unsigned int len, const char *str, const struct qstr *name);
|
|
static int affs_intl_toupper(int ch);
|
|
static int affs_intl_hash_dentry(const struct dentry *,
|
|
const struct inode *, struct qstr *);
|
|
static int affs_intl_compare_dentry(const struct dentry *parent,
|
|
const struct inode *pinode,
|
|
const struct dentry *dentry, const struct inode *inode,
|
|
unsigned int len, const char *str, const struct qstr *name);
|
|
|
|
const struct dentry_operations affs_dentry_operations = {
|
|
.d_hash = affs_hash_dentry,
|
|
.d_compare = affs_compare_dentry,
|
|
};
|
|
|
|
const struct dentry_operations affs_intl_dentry_operations = {
|
|
.d_hash = affs_intl_hash_dentry,
|
|
.d_compare = affs_intl_compare_dentry,
|
|
};
|
|
|
|
|
|
/* Simple toupper() for DOS\1 */
|
|
|
|
static int
|
|
affs_toupper(int ch)
|
|
{
|
|
return ch >= 'a' && ch <= 'z' ? ch -= ('a' - 'A') : ch;
|
|
}
|
|
|
|
/* International toupper() for DOS\3 ("international") */
|
|
|
|
static int
|
|
affs_intl_toupper(int ch)
|
|
{
|
|
return (ch >= 'a' && ch <= 'z') || (ch >= 0xE0
|
|
&& ch <= 0xFE && ch != 0xF7) ?
|
|
ch - ('a' - 'A') : ch;
|
|
}
|
|
|
|
static inline toupper_t
|
|
affs_get_toupper(struct super_block *sb)
|
|
{
|
|
return AFFS_SB(sb)->s_flags & SF_INTL ? affs_intl_toupper : affs_toupper;
|
|
}
|
|
|
|
/*
|
|
* Note: the dentry argument is the parent dentry.
|
|
*/
|
|
static inline int
|
|
__affs_hash_dentry(struct qstr *qstr, toupper_t toupper)
|
|
{
|
|
const u8 *name = qstr->name;
|
|
unsigned long hash;
|
|
int i;
|
|
|
|
i = affs_check_name(qstr->name, qstr->len);
|
|
if (i)
|
|
return i;
|
|
|
|
hash = init_name_hash();
|
|
i = min(qstr->len, 30u);
|
|
for (; i > 0; name++, i--)
|
|
hash = partial_name_hash(toupper(*name), hash);
|
|
qstr->hash = end_name_hash(hash);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
affs_hash_dentry(const struct dentry *dentry, const struct inode *inode,
|
|
struct qstr *qstr)
|
|
{
|
|
return __affs_hash_dentry(qstr, affs_toupper);
|
|
}
|
|
static int
|
|
affs_intl_hash_dentry(const struct dentry *dentry, const struct inode *inode,
|
|
struct qstr *qstr)
|
|
{
|
|
return __affs_hash_dentry(qstr, affs_intl_toupper);
|
|
}
|
|
|
|
static inline int __affs_compare_dentry(unsigned int len,
|
|
const char *str, const struct qstr *name, toupper_t toupper)
|
|
{
|
|
const u8 *aname = str;
|
|
const u8 *bname = name->name;
|
|
|
|
/*
|
|
* 'str' is the name of an already existing dentry, so the name
|
|
* must be valid. 'name' must be validated first.
|
|
*/
|
|
|
|
if (affs_check_name(name->name, name->len))
|
|
return 1;
|
|
|
|
/*
|
|
* If the names are longer than the allowed 30 chars,
|
|
* the excess is ignored, so their length may differ.
|
|
*/
|
|
if (len >= 30) {
|
|
if (name->len < 30)
|
|
return 1;
|
|
len = 30;
|
|
} else if (len != name->len)
|
|
return 1;
|
|
|
|
for (; len > 0; len--)
|
|
if (toupper(*aname++) != toupper(*bname++))
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
affs_compare_dentry(const struct dentry *parent, const struct inode *pinode,
|
|
const struct dentry *dentry, const struct inode *inode,
|
|
unsigned int len, const char *str, const struct qstr *name)
|
|
{
|
|
return __affs_compare_dentry(len, str, name, affs_toupper);
|
|
}
|
|
static int
|
|
affs_intl_compare_dentry(const struct dentry *parent,const struct inode *pinode,
|
|
const struct dentry *dentry, const struct inode *inode,
|
|
unsigned int len, const char *str, const struct qstr *name)
|
|
{
|
|
return __affs_compare_dentry(len, str, name, affs_intl_toupper);
|
|
}
|
|
|
|
/*
|
|
* NOTE! unlike strncmp, affs_match returns 1 for success, 0 for failure.
|
|
*/
|
|
|
|
static inline int
|
|
affs_match(struct dentry *dentry, const u8 *name2, toupper_t toupper)
|
|
{
|
|
const u8 *name = dentry->d_name.name;
|
|
int len = dentry->d_name.len;
|
|
|
|
if (len >= 30) {
|
|
if (*name2 < 30)
|
|
return 0;
|
|
len = 30;
|
|
} else if (len != *name2)
|
|
return 0;
|
|
|
|
for (name2++; len > 0; len--)
|
|
if (toupper(*name++) != toupper(*name2++))
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
int
|
|
affs_hash_name(struct super_block *sb, const u8 *name, unsigned int len)
|
|
{
|
|
toupper_t toupper = affs_get_toupper(sb);
|
|
int hash;
|
|
|
|
hash = len = min(len, 30u);
|
|
for (; len > 0; len--)
|
|
hash = (hash * 13 + toupper(*name++)) & 0x7ff;
|
|
|
|
return hash % AFFS_SB(sb)->s_hashsize;
|
|
}
|
|
|
|
static struct buffer_head *
|
|
affs_find_entry(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
struct super_block *sb = dir->i_sb;
|
|
struct buffer_head *bh;
|
|
toupper_t toupper = affs_get_toupper(sb);
|
|
u32 key;
|
|
|
|
pr_debug("AFFS: find_entry(\"%.*s\")\n", (int)dentry->d_name.len, dentry->d_name.name);
|
|
|
|
bh = affs_bread(sb, dir->i_ino);
|
|
if (!bh)
|
|
return ERR_PTR(-EIO);
|
|
|
|
key = be32_to_cpu(AFFS_HEAD(bh)->table[affs_hash_name(sb, dentry->d_name.name, dentry->d_name.len)]);
|
|
|
|
for (;;) {
|
|
affs_brelse(bh);
|
|
if (key == 0)
|
|
return NULL;
|
|
bh = affs_bread(sb, key);
|
|
if (!bh)
|
|
return ERR_PTR(-EIO);
|
|
if (affs_match(dentry, AFFS_TAIL(sb, bh)->name, toupper))
|
|
return bh;
|
|
key = be32_to_cpu(AFFS_TAIL(sb, bh)->hash_chain);
|
|
}
|
|
}
|
|
|
|
struct dentry *
|
|
affs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
|
|
{
|
|
struct super_block *sb = dir->i_sb;
|
|
struct buffer_head *bh;
|
|
struct inode *inode = NULL;
|
|
|
|
pr_debug("AFFS: lookup(\"%.*s\")\n",(int)dentry->d_name.len,dentry->d_name.name);
|
|
|
|
affs_lock_dir(dir);
|
|
bh = affs_find_entry(dir, dentry);
|
|
affs_unlock_dir(dir);
|
|
if (IS_ERR(bh))
|
|
return ERR_CAST(bh);
|
|
if (bh) {
|
|
u32 ino = bh->b_blocknr;
|
|
|
|
/* store the real header ino in d_fsdata for faster lookups */
|
|
dentry->d_fsdata = (void *)(long)ino;
|
|
switch (be32_to_cpu(AFFS_TAIL(sb, bh)->stype)) {
|
|
//link to dirs disabled
|
|
//case ST_LINKDIR:
|
|
case ST_LINKFILE:
|
|
ino = be32_to_cpu(AFFS_TAIL(sb, bh)->original);
|
|
}
|
|
affs_brelse(bh);
|
|
inode = affs_iget(sb, ino);
|
|
if (IS_ERR(inode))
|
|
return ERR_CAST(inode);
|
|
}
|
|
d_add(dentry, inode);
|
|
return NULL;
|
|
}
|
|
|
|
int
|
|
affs_unlink(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
pr_debug("AFFS: unlink(dir=%d, %lu \"%.*s\")\n", (u32)dir->i_ino,
|
|
dentry->d_inode->i_ino,
|
|
(int)dentry->d_name.len, dentry->d_name.name);
|
|
|
|
return affs_remove_header(dentry);
|
|
}
|
|
|
|
int
|
|
affs_create(struct inode *dir, struct dentry *dentry, umode_t mode, struct nameidata *nd)
|
|
{
|
|
struct super_block *sb = dir->i_sb;
|
|
struct inode *inode;
|
|
int error;
|
|
|
|
pr_debug("AFFS: create(%lu,\"%.*s\",0%ho)\n",dir->i_ino,(int)dentry->d_name.len,
|
|
dentry->d_name.name,mode);
|
|
|
|
inode = affs_new_inode(dir);
|
|
if (!inode)
|
|
return -ENOSPC;
|
|
|
|
inode->i_mode = mode;
|
|
mode_to_prot(inode);
|
|
mark_inode_dirty(inode);
|
|
|
|
inode->i_op = &affs_file_inode_operations;
|
|
inode->i_fop = &affs_file_operations;
|
|
inode->i_mapping->a_ops = (AFFS_SB(sb)->s_flags & SF_OFS) ? &affs_aops_ofs : &affs_aops;
|
|
error = affs_add_entry(dir, inode, dentry, ST_FILE);
|
|
if (error) {
|
|
clear_nlink(inode);
|
|
iput(inode);
|
|
return error;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
affs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
|
|
{
|
|
struct inode *inode;
|
|
int error;
|
|
|
|
pr_debug("AFFS: mkdir(%lu,\"%.*s\",0%ho)\n",dir->i_ino,
|
|
(int)dentry->d_name.len,dentry->d_name.name,mode);
|
|
|
|
inode = affs_new_inode(dir);
|
|
if (!inode)
|
|
return -ENOSPC;
|
|
|
|
inode->i_mode = S_IFDIR | mode;
|
|
mode_to_prot(inode);
|
|
|
|
inode->i_op = &affs_dir_inode_operations;
|
|
inode->i_fop = &affs_dir_operations;
|
|
|
|
error = affs_add_entry(dir, inode, dentry, ST_USERDIR);
|
|
if (error) {
|
|
clear_nlink(inode);
|
|
mark_inode_dirty(inode);
|
|
iput(inode);
|
|
return error;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
affs_rmdir(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
pr_debug("AFFS: rmdir(dir=%u, %lu \"%.*s\")\n", (u32)dir->i_ino,
|
|
dentry->d_inode->i_ino,
|
|
(int)dentry->d_name.len, dentry->d_name.name);
|
|
|
|
return affs_remove_header(dentry);
|
|
}
|
|
|
|
int
|
|
affs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
|
|
{
|
|
struct super_block *sb = dir->i_sb;
|
|
struct buffer_head *bh;
|
|
struct inode *inode;
|
|
char *p;
|
|
int i, maxlen, error;
|
|
char c, lc;
|
|
|
|
pr_debug("AFFS: symlink(%lu,\"%.*s\" -> \"%s\")\n",dir->i_ino,
|
|
(int)dentry->d_name.len,dentry->d_name.name,symname);
|
|
|
|
maxlen = AFFS_SB(sb)->s_hashsize * sizeof(u32) - 1;
|
|
inode = affs_new_inode(dir);
|
|
if (!inode)
|
|
return -ENOSPC;
|
|
|
|
inode->i_op = &affs_symlink_inode_operations;
|
|
inode->i_data.a_ops = &affs_symlink_aops;
|
|
inode->i_mode = S_IFLNK | 0777;
|
|
mode_to_prot(inode);
|
|
|
|
error = -EIO;
|
|
bh = affs_bread(sb, inode->i_ino);
|
|
if (!bh)
|
|
goto err;
|
|
i = 0;
|
|
p = (char *)AFFS_HEAD(bh)->table;
|
|
lc = '/';
|
|
if (*symname == '/') {
|
|
struct affs_sb_info *sbi = AFFS_SB(sb);
|
|
while (*symname == '/')
|
|
symname++;
|
|
spin_lock(&sbi->symlink_lock);
|
|
while (sbi->s_volume[i]) /* Cannot overflow */
|
|
*p++ = sbi->s_volume[i++];
|
|
spin_unlock(&sbi->symlink_lock);
|
|
}
|
|
while (i < maxlen && (c = *symname++)) {
|
|
if (c == '.' && lc == '/' && *symname == '.' && symname[1] == '/') {
|
|
*p++ = '/';
|
|
i++;
|
|
symname += 2;
|
|
lc = '/';
|
|
} else if (c == '.' && lc == '/' && *symname == '/') {
|
|
symname++;
|
|
lc = '/';
|
|
} else {
|
|
*p++ = c;
|
|
lc = c;
|
|
i++;
|
|
}
|
|
if (lc == '/')
|
|
while (*symname == '/')
|
|
symname++;
|
|
}
|
|
*p = 0;
|
|
mark_buffer_dirty_inode(bh, inode);
|
|
affs_brelse(bh);
|
|
mark_inode_dirty(inode);
|
|
|
|
error = affs_add_entry(dir, inode, dentry, ST_SOFTLINK);
|
|
if (error)
|
|
goto err;
|
|
|
|
return 0;
|
|
|
|
err:
|
|
clear_nlink(inode);
|
|
mark_inode_dirty(inode);
|
|
iput(inode);
|
|
return error;
|
|
}
|
|
|
|
int
|
|
affs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry)
|
|
{
|
|
struct inode *inode = old_dentry->d_inode;
|
|
|
|
pr_debug("AFFS: link(%u, %u, \"%.*s\")\n", (u32)inode->i_ino, (u32)dir->i_ino,
|
|
(int)dentry->d_name.len,dentry->d_name.name);
|
|
|
|
return affs_add_entry(dir, inode, dentry, ST_LINKFILE);
|
|
}
|
|
|
|
int
|
|
affs_rename(struct inode *old_dir, struct dentry *old_dentry,
|
|
struct inode *new_dir, struct dentry *new_dentry)
|
|
{
|
|
struct super_block *sb = old_dir->i_sb;
|
|
struct buffer_head *bh = NULL;
|
|
int retval;
|
|
|
|
pr_debug("AFFS: rename(old=%u,\"%*s\" to new=%u,\"%*s\")\n",
|
|
(u32)old_dir->i_ino, (int)old_dentry->d_name.len, old_dentry->d_name.name,
|
|
(u32)new_dir->i_ino, (int)new_dentry->d_name.len, new_dentry->d_name.name);
|
|
|
|
retval = affs_check_name(new_dentry->d_name.name,new_dentry->d_name.len);
|
|
if (retval)
|
|
return retval;
|
|
|
|
/* Unlink destination if it already exists */
|
|
if (new_dentry->d_inode) {
|
|
retval = affs_remove_header(new_dentry);
|
|
if (retval)
|
|
return retval;
|
|
}
|
|
|
|
bh = affs_bread(sb, old_dentry->d_inode->i_ino);
|
|
if (!bh)
|
|
return -EIO;
|
|
|
|
/* Remove header from its parent directory. */
|
|
affs_lock_dir(old_dir);
|
|
retval = affs_remove_hash(old_dir, bh);
|
|
affs_unlock_dir(old_dir);
|
|
if (retval)
|
|
goto done;
|
|
|
|
/* And insert it into the new directory with the new name. */
|
|
affs_copy_name(AFFS_TAIL(sb, bh)->name, new_dentry);
|
|
affs_fix_checksum(sb, bh);
|
|
affs_lock_dir(new_dir);
|
|
retval = affs_insert_hash(new_dir, bh);
|
|
affs_unlock_dir(new_dir);
|
|
/* TODO: move it back to old_dir, if error? */
|
|
|
|
done:
|
|
mark_buffer_dirty_inode(bh, retval ? old_dir : new_dir);
|
|
affs_brelse(bh);
|
|
return retval;
|
|
}
|