static struct dentry *reiserfs_lookup(struct inode *dir, struct dentry *dentry,
struct nameidata *nd)
{
int retval;
struct inode *inode = NULL;
struct reiserfs_dir_entry de;
INITIALIZE_PATH(path_to_entry);
if (REISERFS_MAX_NAME(dir->i_sb->s_blocksize) < dentry->d_name.len)
return ERR_PTR(-ENAMETOOLONG);
reiserfs_write_lock(dir->i_sb);
de.de_gen_number_bit_string = NULL;
retval =
reiserfs_find_entry(dir, dentry->d_name.name, dentry->d_name.len,
&path_to_entry, &de);
pathrelse(&path_to_entry);
if (retval == NAME_FOUND) {
/* Hide the .reiserfs_priv directory */
if (reiserfs_xattrs(dir->i_sb) &&
!old_format_only(dir->i_sb) &&
REISERFS_SB(dir->i_sb)->priv_root &&
REISERFS_SB(dir->i_sb)->priv_root->d_inode &&
de.de_objectid ==
le32_to_cpu(INODE_PKEY
(REISERFS_SB(dir->i_sb)->priv_root->d_inode)->
k_objectid)) {
reiserfs_write_unlock(dir->i_sb);
return ERR_PTR(-EACCES);
}
inode =
reiserfs_iget(dir->i_sb, (struct cpu_key *)&(de.de_dir_id));
if (!inode || IS_ERR(inode)) {
reiserfs_write_unlock(dir->i_sb);
return ERR_PTR(-EACCES);
}
/* Propogate the priv_object flag so we know we're in the priv tree */
if (is_reiserfs_priv_object(dir))
reiserfs_mark_inode_private(inode);
}
reiserfs_write_unlock(dir->i_sb);
if (retval == IO_ERROR) {
return ERR_PTR(-EIO);
}
return d_splice_alias(inode, dentry);
}
static int reiserfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
{
struct inode *inode = filp->f_path.dentry->d_inode;
struct cpu_key pos_key; /* key of current position in the directory (key of directory entry) */
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;
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,
(filp->f_pos) ? (filp->f_pos) : DOT_OFFSET, TYPE_DIRENTRY,
3);
next_pos = cpu_key_k_offset(&pos_key);
/* reiserfs_warning (inode->i_sb, "reiserfs_readdir 1: f_pos = %Ld", filp->f_pos); */
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(I_ENTRY_COUNT(ih) < entry_num,
"vs-9010: entry number is too big %d (%d)",
entry_num, I_ENTRY_COUNT(ih));
if (search_res == POSITION_FOUND
|| entry_num < I_ENTRY_COUNT(ih)) {
/* go through all entries in the directory item beginning from the entry, that has been found */
struct reiserfs_de_head *deh =
B_I_DEH(bh, ih) + entry_num;
for (; entry_num < I_ENTRY_COUNT(ih);
entry_num++, deh++) {
int d_reclen;
char *d_name;
off_t d_off;
ino_t d_ino;
if (!de_visible(deh))
/* it is hidden entry */
continue;
d_reclen = entry_length(bh, ih, entry_num);
d_name = B_I_DEH_ENTRY_FILE_NAME(bh, ih, deh);
if (!d_name[d_reclen - 1])
d_reclen = strlen(d_name);
if (d_reclen >
REISERFS_MAX_NAME(inode->i_sb->
s_blocksize)) {
/* too big to send back to VFS */
continue;
}
/* Ignore the .reiserfs_priv entry */
if (reiserfs_xattrs(inode->i_sb) &&
!old_format_only(inode->i_sb) &&
filp->f_path.dentry == inode->i_sb->s_root &&
REISERFS_SB(inode->i_sb)->priv_root &&
REISERFS_SB(inode->i_sb)->priv_root->d_inode
&& deh_objectid(deh) ==
le32_to_cpu(INODE_PKEY
(REISERFS_SB(inode->i_sb)->
priv_root->d_inode)->
k_objectid)) {
continue;
}
d_off = deh_offset(deh);
filp->f_pos = d_off;
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);
if (filldir
(dirent, local_buf, d_reclen, d_off, d_ino,
DT_UNKNOWN) < 0) {
if (local_buf != small_buf) {
kfree(local_buf);
}
goto end;
}
if (local_buf != small_buf) {
kfree(local_buf);
}
// next entry should be looked for with such offset
next_pos = deh_offset(deh) + 1;
if (item_moved(&tmp_ih, &path_to_entry)) {
goto research;
}
} /* for */
}
if (item_num != B_NR_ITEMS(bh) - 1)
// end of directory has been reached
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;
}
if (COMP_SHORT_KEYS(rkey, &pos_key)) {
// end of directory has been reached
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:
filp->f_pos = next_pos;
pathrelse(&path_to_entry);
reiserfs_check_path(&path_to_entry);
out:
reiserfs_write_unlock(inode->i_sb);
return ret;
}
int
reiserfs_lookup(struct vop_cachedlookup_args *ap)
{
int error, retval;
struct vnode *vdp = ap->a_dvp;
struct vnode **vpp = ap->a_vpp;
struct componentname *cnp = ap->a_cnp;
int flags = cnp->cn_flags;
struct thread *td = cnp->cn_thread;
struct cpu_key *saved_ino;
struct vnode *vp;
struct vnode *pdp; /* Saved dp during symlink work */
struct reiserfs_node *dp;
struct reiserfs_dir_entry de;
INITIALIZE_PATH(path_to_entry);
char c = cnp->cn_nameptr[cnp->cn_namelen];
cnp->cn_nameptr[cnp->cn_namelen] = '\0';
reiserfs_log(LOG_DEBUG, "looking for `%s', %ld (%s)\n",
cnp->cn_nameptr, cnp->cn_namelen, cnp->cn_pnbuf);
cnp->cn_nameptr[cnp->cn_namelen] = c;
vp = NULL;
dp = VTOI(vdp);
if (REISERFS_MAX_NAME(dp->i_reiserfs->s_blocksize) < cnp->cn_namelen)
return (ENAMETOOLONG);
reiserfs_log(LOG_DEBUG, "searching entry\n");
de.de_gen_number_bit_string = 0;
retval = reiserfs_find_entry(dp, cnp->cn_nameptr, cnp->cn_namelen,
&path_to_entry, &de);
pathrelse(&path_to_entry);
if (retval == NAME_FOUND) {
reiserfs_log(LOG_DEBUG, "found\n");
} else {
reiserfs_log(LOG_DEBUG, "not found\n");
}
if (retval == NAME_FOUND) {
#if 0
/* Hide the .reiserfs_priv directory */
if (reiserfs_xattrs(dp->i_reiserfs) &&
!old_format_only(dp->i_reiserfs) &&
REISERFS_SB(dp->i_reiserfs)->priv_root &&
REISERFS_SB(dp->i_reiserfs)->priv_root->d_inode &&
de.de_objectid == le32toh(INODE_PKEY(REISERFS_SB(
dp->i_reiserfs)->priv_root->d_inode)->k_objectid)) {
return (EACCES);
}
#endif
reiserfs_log(LOG_DEBUG, "reading vnode\n");
pdp = vdp;
if (flags & ISDOTDOT) {
saved_ino = (struct cpu_key *)&(de.de_dir_id);
VOP_UNLOCK(pdp, 0);
error = reiserfs_iget(vdp->v_mount,
saved_ino, &vp, td);
vn_lock(pdp, LK_EXCLUSIVE | LK_RETRY);
if (error != 0)
return (error);
*vpp = vp;
} else if (de.de_objectid == dp->i_number &&
de.de_dir_id == dp->i_ino) {
VREF(vdp); /* We want ourself, ie "." */
*vpp = vdp;
} else {
if ((error = reiserfs_iget(vdp->v_mount,
(struct cpu_key *)&(de.de_dir_id), &vp, td)) != 0)
return (error);
*vpp = vp;
}
/*
* Propogate the priv_object flag so we know we're in the
* priv tree
*/
/*if (is_reiserfs_priv_object(dir))
REISERFS_I(inode)->i_flags |= i_priv_object;*/
} else {
if (retval == IO_ERROR) {
reiserfs_log(LOG_DEBUG, "IO error\n");
return (EIO);
}
return (ENOENT);
}
/* Insert name into cache if appropriate. */
if (cnp->cn_flags & MAKEENTRY)
cache_enter(vdp, *vpp, cnp);
reiserfs_log(LOG_DEBUG, "done\n");
return (0);
}
int
reiserfs_readdir(struct vop_readdir_args /* {
struct vnode *a_vp;
struct uio *a_uio;
struct ucred *a_cred;
int *a_eofflag;
int *a_ncookies;
u_long **a_cookies;
} */*ap)
{
int error = 0;
struct dirent dstdp;
struct uio *uio = ap->a_uio;
off_t next_pos;
struct buf *bp;
struct item_head *ih;
struct cpu_key pos_key;
const struct key *rkey;
struct reiserfs_node *ip;
struct reiserfs_dir_entry de;
INITIALIZE_PATH(path_to_entry);
int entry_num, item_num, search_res;
/* The NFS part */
int ncookies = 0;
u_long *cookies = NULL;
/*
* Form key for search the next directory entry using f_pos field of
* file structure
*/
ip = VTOI(ap->a_vp);
make_cpu_key(&pos_key,
ip, uio->uio_offset ? uio->uio_offset : DOT_OFFSET,
TYPE_DIRENTRY, 3);
next_pos = cpu_key_k_offset(&pos_key);
reiserfs_log(LOG_DEBUG, "listing entries for "
"(objectid=%d, dirid=%d)\n",
pos_key.on_disk_key.k_objectid, pos_key.on_disk_key.k_dir_id);
reiserfs_log(LOG_DEBUG, "uio_offset = %jd, uio_resid = %d\n",
(intmax_t)uio->uio_offset, uio->uio_resid);
if (ap->a_ncookies && ap->a_cookies) {
cookies = (u_long *)malloc(
uio->uio_resid / 16 * sizeof(u_long),
M_REISERFSCOOKIES, M_WAITOK);
}
while (1) {
//research:
/*
* Search the directory item, containing entry with
* specified key
*/
reiserfs_log(LOG_DEBUG, "search directory to read\n");
search_res = search_by_entry_key(ip->i_reiserfs, &pos_key,
&path_to_entry, &de);
if (search_res == IO_ERROR) {
error = EIO;
goto out;
}
entry_num = de.de_entry_num;
item_num = de.de_item_num;
bp = de.de_bp;
ih = de.de_ih;
if (search_res == POSITION_FOUND ||
entry_num < I_ENTRY_COUNT(ih)) {
/*
* Go through all entries in the directory item
* beginning from the entry, that has been found.
*/
struct reiserfs_de_head *deh = B_I_DEH(bp, ih) +
entry_num;
if (ap->a_ncookies == NULL) {
cookies = NULL;
} else {
//ncookies =
}
reiserfs_log(LOG_DEBUG,
"walking through directory entries\n");
for (; entry_num < I_ENTRY_COUNT(ih);
entry_num++, deh++) {
int d_namlen;
char *d_name;
off_t d_off;
ino_t d_ino;
if (!de_visible(deh)) {
/* It is hidden entry */
continue;
}
d_namlen = entry_length(bp, ih, entry_num);
d_name = B_I_DEH_ENTRY_FILE_NAME(bp, ih, deh);
if (!d_name[d_namlen - 1])
d_namlen = strlen(d_name);
reiserfs_log(LOG_DEBUG, " - `%s' (len=%d)\n",
d_name, d_namlen);
if (d_namlen > REISERFS_MAX_NAME(
ip->i_reiserfs->s_blocksize)) {
/* Too big to send back to VFS */
continue;
}
#if 0
/* Ignore the .reiserfs_priv entry */
if (reiserfs_xattrs(ip->i_reiserfs) &&
!old_format_only(ip->i_reiserfs) &&
filp->f_dentry == ip->i_reiserfs->s_root &&
REISERFS_SB(ip->i_reiserfs)->priv_root &&
REISERFS_SB(ip->i_reiserfs)->priv_root->d_inode &&
deh_objectid(deh) ==
le32toh(INODE_PKEY(REISERFS_SB(
ip->i_reiserfs)->priv_root->d_inode)->k_objectid)) {
continue;
}
#endif
d_off = deh_offset(deh);
d_ino = deh_objectid(deh);
uio->uio_offset = d_off;
/* Copy to user land */
dstdp.d_fileno = d_ino;
dstdp.d_type = DT_UNKNOWN;
dstdp.d_namlen = d_namlen;
dstdp.d_reclen = GENERIC_DIRSIZ(&dstdp);
bcopy(d_name, dstdp.d_name, dstdp.d_namlen);
bzero(dstdp.d_name + dstdp.d_namlen,
dstdp.d_reclen -
offsetof(struct dirent, d_name) -
dstdp.d_namlen);
if (d_namlen > 0) {
if (dstdp.d_reclen <= uio->uio_resid) {
reiserfs_log(LOG_DEBUG, " copying to user land\n");
error = uiomove(&dstdp,
dstdp.d_reclen, uio);
if (error)
goto end;
if (cookies != NULL) {
cookies[ncookies] =
d_off;
ncookies++;
}
} else
break;
} else {
error = EIO;
break;
}
next_pos = deh_offset(deh) + 1;
}
reiserfs_log(LOG_DEBUG, "...done\n");
}
reiserfs_log(LOG_DEBUG, "checking item num (%d == %d ?)\n",
item_num, B_NR_ITEMS(bp) - 1);
if (item_num != B_NR_ITEMS(bp) - 1) {
/* End of directory has been reached */
reiserfs_log(LOG_DEBUG, "end reached\n");
if (ap->a_eofflag)
*ap->a_eofflag = 1;
goto end;
}
/*
* Item we went through is last item of node. Using right
* delimiting key check is it directory end
*/
reiserfs_log(LOG_DEBUG, "get right key\n");
rkey = get_rkey(&path_to_entry, ip->i_reiserfs);
reiserfs_log(LOG_DEBUG, "right key = (objectid=%d, dirid=%d)\n",
rkey->k_objectid, rkey->k_dir_id);
reiserfs_log(LOG_DEBUG, "compare it to MIN_KEY\n");
reiserfs_log(LOG_DEBUG, "MIN KEY = (objectid=%d, dirid=%d)\n",
MIN_KEY.k_objectid, MIN_KEY.k_dir_id);
if (comp_le_keys(rkey, &MIN_KEY) == 0) {
/* Set pos_key to key, that is the smallest and greater
* that key of the last entry in the item */
reiserfs_log(LOG_DEBUG, "continuing on the right\n");
set_cpu_key_k_offset(&pos_key, next_pos);
continue;
}
reiserfs_log(LOG_DEBUG, "compare it to pos_key\n");
reiserfs_log(LOG_DEBUG, "pos key = (objectid=%d, dirid=%d)\n",
pos_key.on_disk_key.k_objectid,
pos_key.on_disk_key.k_dir_id);
if (COMP_SHORT_KEYS(rkey, &pos_key)) {
/* End of directory has been reached */
reiserfs_log(LOG_DEBUG, "end reached (right)\n");
if (ap->a_eofflag)
*ap->a_eofflag = 1;
goto end;
}
/* Directory continues in the right neighboring block */
reiserfs_log(LOG_DEBUG, "continuing with a new offset\n");
set_cpu_key_k_offset(&pos_key,
le_key_k_offset(KEY_FORMAT_3_5, rkey));
reiserfs_log(LOG_DEBUG,
"new pos key = (objectid=%d, dirid=%d)\n",
pos_key.on_disk_key.k_objectid,
pos_key.on_disk_key.k_dir_id);
}
end:
uio->uio_offset = next_pos;
pathrelse(&path_to_entry);
reiserfs_check_path(&path_to_entry);
out:
if (error && cookies != NULL) {
free(cookies, M_REISERFSCOOKIES);
} else if (ap->a_ncookies != NULL && ap->a_cookies != NULL) {
*ap->a_ncookies = ncookies;
*ap->a_cookies = cookies;
}
return (error);
}
