mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 05:48:40 +00:00
![Jeff Mahoney](/assets/img/avatar_default.png)
This patch reformats comments in the reiserfs code to fit in 80 columns and to follow the style rules. There is no functional change but it helps make my eyes bleed less. Signed-off-by: Jeff Mahoney <jeffm@suse.com> Signed-off-by: Jan Kara <jack@suse.cz>
345 lines
9.1 KiB
C
345 lines
9.1 KiB
C
/*
|
|
* 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 <asm/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 *deh;
|
|
|
|
memset(body, 0, EMPTY_DIR_SIZE_V1);
|
|
deh = (struct reiserfs_de_head *)body;
|
|
|
|
/* direntry header of "." */
|
|
put_deh_offset(&(deh[0]), DOT_OFFSET);
|
|
/* these two are from make_le_item_head, and are are LE */
|
|
deh[0].deh_dir_id = dirid;
|
|
deh[0].deh_objectid = objid;
|
|
deh[0].deh_state = 0; /* Endian safe if 0 */
|
|
put_deh_location(&(deh[0]), EMPTY_DIR_SIZE_V1 - strlen("."));
|
|
mark_de_visible(&(deh[0]));
|
|
|
|
/* direntry header of ".." */
|
|
put_deh_offset(&(deh[1]), DOT_DOT_OFFSET);
|
|
/* key of ".." for the root directory */
|
|
/* these two are from the inode, and are are LE */
|
|
deh[1].deh_dir_id = par_dirid;
|
|
deh[1].deh_objectid = par_objid;
|
|
deh[1].deh_state = 0; /* Endian safe if 0 */
|
|
put_deh_location(&(deh[1]), deh_location(&(deh[0])) - strlen(".."));
|
|
mark_de_visible(&(deh[1]));
|
|
|
|
/* copy ".." and "." */
|
|
memcpy(body + deh_location(&(deh[0])), ".", 1);
|
|
memcpy(body + deh_location(&(deh[1])), "..", 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 *deh;
|
|
|
|
memset(body, 0, EMPTY_DIR_SIZE);
|
|
deh = (struct reiserfs_de_head *)body;
|
|
|
|
/* direntry header of "." */
|
|
put_deh_offset(&(deh[0]), DOT_OFFSET);
|
|
/* these two are from make_le_item_head, and are are LE */
|
|
deh[0].deh_dir_id = dirid;
|
|
deh[0].deh_objectid = objid;
|
|
deh[0].deh_state = 0; /* Endian safe if 0 */
|
|
put_deh_location(&(deh[0]), EMPTY_DIR_SIZE - ROUND_UP(strlen(".")));
|
|
mark_de_visible(&(deh[0]));
|
|
|
|
/* direntry header of ".." */
|
|
put_deh_offset(&(deh[1]), DOT_DOT_OFFSET);
|
|
/* key of ".." for the root directory */
|
|
/* these two are from the inode, and are are LE */
|
|
deh[1].deh_dir_id = par_dirid;
|
|
deh[1].deh_objectid = par_objid;
|
|
deh[1].deh_state = 0; /* Endian safe if 0 */
|
|
put_deh_location(&(deh[1]),
|
|
deh_location(&(deh[0])) - ROUND_UP(strlen("..")));
|
|
mark_de_visible(&(deh[1]));
|
|
|
|
/* copy ".." and "." */
|
|
memcpy(body + deh_location(&(deh[0])), ".", 1);
|
|
memcpy(body + deh_location(&(deh[1])), "..", 2);
|
|
}
|