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.
346 lines
9.0 KiB
346 lines
9.0 KiB
/*
|
|
* Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
|
|
*/
|
|
|
|
#include <linux/string.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/fs.h>
|
|
#include "reiserfs.h"
|
|
#include <linux/stat.h>
|
|
#include <linux/buffer_head.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/uaccess.h>
|
|
|
|
extern const struct reiserfs_key MIN_KEY;
|
|
|
|
static int reiserfs_readdir(struct file *, struct dir_context *);
|
|
static int reiserfs_dir_fsync(struct file *filp, loff_t start, loff_t end,
|
|
int datasync);
|
|
|
|
const struct file_operations reiserfs_dir_operations = {
|
|
.llseek = generic_file_llseek,
|
|
.read = generic_read_dir,
|
|
.iterate = reiserfs_readdir,
|
|
.fsync = reiserfs_dir_fsync,
|
|
.unlocked_ioctl = reiserfs_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = reiserfs_compat_ioctl,
|
|
#endif
|
|
};
|
|
|
|
static int reiserfs_dir_fsync(struct file *filp, loff_t start, loff_t end,
|
|
int datasync)
|
|
{
|
|
struct inode *inode = filp->f_mapping->host;
|
|
int err;
|
|
|
|
err = filemap_write_and_wait_range(inode->i_mapping, start, end);
|
|
if (err)
|
|
return err;
|
|
|
|
mutex_lock(&inode->i_mutex);
|
|
reiserfs_write_lock(inode->i_sb);
|
|
err = reiserfs_commit_for_inode(inode);
|
|
reiserfs_write_unlock(inode->i_sb);
|
|
mutex_unlock(&inode->i_mutex);
|
|
if (err < 0)
|
|
return err;
|
|
return 0;
|
|
}
|
|
|
|
#define store_ih(where,what) copy_item_head (where, what)
|
|
|
|
static inline bool is_privroot_deh(struct inode *dir, struct reiserfs_de_head *deh)
|
|
{
|
|
struct dentry *privroot = REISERFS_SB(dir->i_sb)->priv_root;
|
|
return (privroot->d_inode &&
|
|
deh->deh_objectid == INODE_PKEY(privroot->d_inode)->k_objectid);
|
|
}
|
|
|
|
int reiserfs_readdir_inode(struct inode *inode, struct dir_context *ctx)
|
|
{
|
|
|
|
/* key of current position in the directory (key of directory entry) */
|
|
struct cpu_key pos_key;
|
|
|
|
INITIALIZE_PATH(path_to_entry);
|
|
struct buffer_head *bh;
|
|
int item_num, entry_num;
|
|
const struct reiserfs_key *rkey;
|
|
struct item_head *ih, tmp_ih;
|
|
int search_res;
|
|
char *local_buf;
|
|
loff_t next_pos;
|
|
char small_buf[32]; /* avoid kmalloc if we can */
|
|
struct reiserfs_dir_entry de;
|
|
int ret = 0;
|
|
int depth;
|
|
|
|
reiserfs_write_lock(inode->i_sb);
|
|
|
|
reiserfs_check_lock_depth(inode->i_sb, "readdir");
|
|
|
|
/*
|
|
* form key for search the next directory entry using
|
|
* f_pos field of file structure
|
|
*/
|
|
make_cpu_key(&pos_key, inode, ctx->pos ?: DOT_OFFSET, TYPE_DIRENTRY, 3);
|
|
next_pos = cpu_key_k_offset(&pos_key);
|
|
|
|
path_to_entry.reada = PATH_READA;
|
|
while (1) {
|
|
research:
|
|
/*
|
|
* search the directory item, containing entry with
|
|
* specified key
|
|
*/
|
|
search_res =
|
|
search_by_entry_key(inode->i_sb, &pos_key, &path_to_entry,
|
|
&de);
|
|
if (search_res == IO_ERROR) {
|
|
/*
|
|
* FIXME: we could just skip part of directory
|
|
* which could not be read
|
|
*/
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
entry_num = de.de_entry_num;
|
|
bh = de.de_bh;
|
|
item_num = de.de_item_num;
|
|
ih = de.de_ih;
|
|
store_ih(&tmp_ih, ih);
|
|
|
|
/* we must have found item, that is item of this directory, */
|
|
RFALSE(COMP_SHORT_KEYS(&ih->ih_key, &pos_key),
|
|
"vs-9000: found item %h does not match to dir we readdir %K",
|
|
ih, &pos_key);
|
|
RFALSE(item_num > B_NR_ITEMS(bh) - 1,
|
|
"vs-9005 item_num == %d, item amount == %d",
|
|
item_num, B_NR_ITEMS(bh));
|
|
|
|
/*
|
|
* and entry must be not more than number of entries
|
|
* in the item
|
|
*/
|
|
RFALSE(ih_entry_count(ih) < entry_num,
|
|
"vs-9010: entry number is too big %d (%d)",
|
|
entry_num, ih_entry_count(ih));
|
|
|
|
/*
|
|
* go through all entries in the directory item beginning
|
|
* from the entry, that has been found
|
|
*/
|
|
if (search_res == POSITION_FOUND
|
|
|| entry_num < ih_entry_count(ih)) {
|
|
struct reiserfs_de_head *deh =
|
|
B_I_DEH(bh, ih) + entry_num;
|
|
|
|
for (; entry_num < ih_entry_count(ih);
|
|
entry_num++, deh++) {
|
|
int d_reclen;
|
|
char *d_name;
|
|
ino_t d_ino;
|
|
loff_t cur_pos = deh_offset(deh);
|
|
|
|
/* it is hidden entry */
|
|
if (!de_visible(deh))
|
|
continue;
|
|
d_reclen = entry_length(bh, ih, entry_num);
|
|
d_name = B_I_DEH_ENTRY_FILE_NAME(bh, ih, deh);
|
|
|
|
if (d_reclen <= 0 ||
|
|
d_name + d_reclen > bh->b_data + bh->b_size) {
|
|
/*
|
|
* There is corrupted data in entry,
|
|
* We'd better stop here
|
|
*/
|
|
pathrelse(&path_to_entry);
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
if (!d_name[d_reclen - 1])
|
|
d_reclen = strlen(d_name);
|
|
|
|
/* too big to send back to VFS */
|
|
if (d_reclen >
|
|
REISERFS_MAX_NAME(inode->i_sb->
|
|
s_blocksize)) {
|
|
continue;
|
|
}
|
|
|
|
/* Ignore the .reiserfs_priv entry */
|
|
if (is_privroot_deh(inode, deh))
|
|
continue;
|
|
|
|
ctx->pos = deh_offset(deh);
|
|
d_ino = deh_objectid(deh);
|
|
if (d_reclen <= 32) {
|
|
local_buf = small_buf;
|
|
} else {
|
|
local_buf = kmalloc(d_reclen,
|
|
GFP_NOFS);
|
|
if (!local_buf) {
|
|
pathrelse(&path_to_entry);
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
if (item_moved(&tmp_ih, &path_to_entry)) {
|
|
kfree(local_buf);
|
|
goto research;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Note, that we copy name to user space via
|
|
* temporary buffer (local_buf) because
|
|
* filldir will block if user space buffer is
|
|
* swapped out. At that time entry can move to
|
|
* somewhere else
|
|
*/
|
|
memcpy(local_buf, d_name, d_reclen);
|
|
|
|
/*
|
|
* Since filldir might sleep, we can release
|
|
* the write lock here for other waiters
|
|
*/
|
|
depth = reiserfs_write_unlock_nested(inode->i_sb);
|
|
if (!dir_emit
|
|
(ctx, local_buf, d_reclen, d_ino,
|
|
DT_UNKNOWN)) {
|
|
reiserfs_write_lock_nested(inode->i_sb, depth);
|
|
if (local_buf != small_buf) {
|
|
kfree(local_buf);
|
|
}
|
|
goto end;
|
|
}
|
|
reiserfs_write_lock_nested(inode->i_sb, depth);
|
|
if (local_buf != small_buf) {
|
|
kfree(local_buf);
|
|
}
|
|
|
|
/* deh_offset(deh) may be invalid now. */
|
|
next_pos = cur_pos + 1;
|
|
|
|
if (item_moved(&tmp_ih, &path_to_entry)) {
|
|
set_cpu_key_k_offset(&pos_key,
|
|
next_pos);
|
|
goto research;
|
|
}
|
|
} /* for */
|
|
}
|
|
|
|
/* end of directory has been reached */
|
|
if (item_num != B_NR_ITEMS(bh) - 1)
|
|
goto end;
|
|
|
|
/*
|
|
* item we went through is last item of node. Using right
|
|
* delimiting key check is it directory end
|
|
*/
|
|
rkey = get_rkey(&path_to_entry, inode->i_sb);
|
|
if (!comp_le_keys(rkey, &MIN_KEY)) {
|
|
/*
|
|
* set pos_key to key, that is the smallest and greater
|
|
* that key of the last entry in the item
|
|
*/
|
|
set_cpu_key_k_offset(&pos_key, next_pos);
|
|
continue;
|
|
}
|
|
|
|
/* end of directory has been reached */
|
|
if (COMP_SHORT_KEYS(rkey, &pos_key)) {
|
|
goto end;
|
|
}
|
|
|
|
/* directory continues in the right neighboring block */
|
|
set_cpu_key_k_offset(&pos_key,
|
|
le_key_k_offset(KEY_FORMAT_3_5, rkey));
|
|
|
|
} /* while */
|
|
|
|
end:
|
|
ctx->pos = next_pos;
|
|
pathrelse(&path_to_entry);
|
|
reiserfs_check_path(&path_to_entry);
|
|
out:
|
|
reiserfs_write_unlock(inode->i_sb);
|
|
return ret;
|
|
}
|
|
|
|
static int reiserfs_readdir(struct file *file, struct dir_context *ctx)
|
|
{
|
|
return reiserfs_readdir_inode(file_inode(file), ctx);
|
|
}
|
|
|
|
/*
|
|
* compose directory item containing "." and ".." entries (entries are
|
|
* not aligned to 4 byte boundary)
|
|
*/
|
|
void make_empty_dir_item_v1(char *body, __le32 dirid, __le32 objid,
|
|
__le32 par_dirid, __le32 par_objid)
|
|
{
|
|
struct reiserfs_de_head *dot, *dotdot;
|
|
|
|
memset(body, 0, EMPTY_DIR_SIZE_V1);
|
|
dot = (struct reiserfs_de_head *)body;
|
|
dotdot = dot + 1;
|
|
|
|
/* direntry header of "." */
|
|
put_deh_offset(dot, DOT_OFFSET);
|
|
/* these two are from make_le_item_head, and are are LE */
|
|
dot->deh_dir_id = dirid;
|
|
dot->deh_objectid = objid;
|
|
dot->deh_state = 0; /* Endian safe if 0 */
|
|
put_deh_location(dot, EMPTY_DIR_SIZE_V1 - strlen("."));
|
|
mark_de_visible(dot);
|
|
|
|
/* direntry header of ".." */
|
|
put_deh_offset(dotdot, DOT_DOT_OFFSET);
|
|
/* key of ".." for the root directory */
|
|
/* these two are from the inode, and are are LE */
|
|
dotdot->deh_dir_id = par_dirid;
|
|
dotdot->deh_objectid = par_objid;
|
|
dotdot->deh_state = 0; /* Endian safe if 0 */
|
|
put_deh_location(dotdot, deh_location(dot) - strlen(".."));
|
|
mark_de_visible(dotdot);
|
|
|
|
/* copy ".." and "." */
|
|
memcpy(body + deh_location(dot), ".", 1);
|
|
memcpy(body + deh_location(dotdot), "..", 2);
|
|
}
|
|
|
|
/* compose directory item containing "." and ".." entries */
|
|
void make_empty_dir_item(char *body, __le32 dirid, __le32 objid,
|
|
__le32 par_dirid, __le32 par_objid)
|
|
{
|
|
struct reiserfs_de_head *dot, *dotdot;
|
|
|
|
memset(body, 0, EMPTY_DIR_SIZE);
|
|
dot = (struct reiserfs_de_head *)body;
|
|
dotdot = dot + 1;
|
|
|
|
/* direntry header of "." */
|
|
put_deh_offset(dot, DOT_OFFSET);
|
|
/* these two are from make_le_item_head, and are are LE */
|
|
dot->deh_dir_id = dirid;
|
|
dot->deh_objectid = objid;
|
|
dot->deh_state = 0; /* Endian safe if 0 */
|
|
put_deh_location(dot, EMPTY_DIR_SIZE - ROUND_UP(strlen(".")));
|
|
mark_de_visible(dot);
|
|
|
|
/* direntry header of ".." */
|
|
put_deh_offset(dotdot, DOT_DOT_OFFSET);
|
|
/* key of ".." for the root directory */
|
|
/* these two are from the inode, and are are LE */
|
|
dotdot->deh_dir_id = par_dirid;
|
|
dotdot->deh_objectid = par_objid;
|
|
dotdot->deh_state = 0; /* Endian safe if 0 */
|
|
put_deh_location(dotdot, deh_location(dot) - ROUND_UP(strlen("..")));
|
|
mark_de_visible(dotdot);
|
|
|
|
/* copy ".." and "." */
|
|
memcpy(body + deh_location(dot), ".", 1);
|
|
memcpy(body + deh_location(dotdot), "..", 2);
|
|
}
|
|
|