static int
befs_readdir(struct file *file, struct dir_context *ctx)
{
struct inode *inode = file_inode(file);
struct super_block *sb = inode->i_sb;
befs_data_stream *ds = &BEFS_I(inode)->i_data.ds;
befs_off_t value;
int result;
size_t keysize;
unsigned char d_type;
char keybuf[BEFS_NAME_LEN + 1];
befs_debug(sb, "---> %s name %pD, inode %ld, ctx->pos %lld",
__func__, file, inode->i_ino, ctx->pos);
more:
result = befs_btree_read(sb, ds, ctx->pos, BEFS_NAME_LEN + 1,
keybuf, &keysize, &value);
if (result == BEFS_ERR) {
befs_debug(sb, "<--- %s ERROR", __func__);
befs_error(sb, "IO error reading %pD (inode %lu)",
file, inode->i_ino);
return -EIO;
} else if (result == BEFS_BT_END) {
befs_debug(sb, "<--- %s END", __func__);
return 0;
} else if (result == BEFS_BT_EMPTY) {
befs_debug(sb, "<--- %s Empty directory", __func__);
return 0;
}
d_type = DT_UNKNOWN;
/* Convert to NLS */
if (BEFS_SB(sb)->nls) {
char *nlsname;
int nlsnamelen;
result =
befs_utf2nls(sb, keybuf, keysize, &nlsname, &nlsnamelen);
if (result < 0) {
befs_debug(sb, "<--- %s ERROR", __func__);
return result;
}
if (!dir_emit(ctx, nlsname, nlsnamelen,
(ino_t) value, d_type)) {
kfree(nlsname);
return 0;
}
kfree(nlsname);
} else {
if (!dir_emit(ctx, keybuf, keysize,
(ino_t) value, d_type))
return 0;
}
ctx->pos++;
goto more;
}
/*
* Get root directory contents.
*/
static int
zpl_root_iterate(struct file *filp, struct dir_context *ctx)
{
zfs_sb_t *zsb = ITOZSB(filp->f_path.dentry->d_inode);
int error = 0;
ZFS_ENTER(zsb);
if (!dir_emit_dots(filp, ctx))
goto out;
if (ctx->pos == 2) {
if (!dir_emit(ctx, ZFS_SNAPDIR_NAME, strlen(ZFS_SNAPDIR_NAME),
ZFSCTL_INO_SNAPDIR, DT_DIR))
goto out;
ctx->pos++;
}
if (ctx->pos == 3) {
if (!dir_emit(ctx, ZFS_SHAREDIR_NAME, strlen(ZFS_SHAREDIR_NAME),
ZFSCTL_INO_SHARES, DT_DIR))
goto out;
ctx->pos++;
}
out:
ZFS_EXIT(zsb);
return (error);
}
bool f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d,
unsigned int start_pos)
{
unsigned char d_type = DT_UNKNOWN;
unsigned int bit_pos;
struct f2fs_dir_entry *de = NULL;
bit_pos = ((unsigned long)ctx->pos % d->max);
while (bit_pos < d->max) {
bit_pos = find_next_bit_le(d->bitmap, d->max, bit_pos);
if (bit_pos >= d->max)
break;
de = &d->dentry[bit_pos];
if (de->file_type < F2FS_FT_MAX)
d_type = f2fs_filetype_table[de->file_type];
else
d_type = DT_UNKNOWN;
if (!dir_emit(ctx, d->filename[bit_pos],
le16_to_cpu(de->name_len),
le32_to_cpu(de->ino), d_type))
return true;
bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
ctx->pos = start_pos + bit_pos;
}
return false;
}
static Bool
HgfsReaddirFillEntry(filldir_t filldirCb, // IN: System filler callback
void *filldirCtx, // IN/OUT: System filler context
char *entryName, // IN: entry name
uint32 entryNameLength, // IN: max name length
loff_t entryPos, // IN: position = (ctx-pos)
ino_t entryIno, // IN: inode entry number
uint32 entryType) // IN: entry type
{
struct dir_context *ctx = filldirCtx;
Bool result;
ASSERT(filldirCb == NULL); /* Contained within the context structure. */
ASSERT(ctx != NULL);
ASSERT(ctx->pos == entryPos);
ASSERT(entryName != NULL);
ASSERT(entryNameLength != 0);
LOG(6, (KERN_DEBUG "VMware hgfs: %s: dir_emit(%s, %u, %Lu)\n",
__func__, entryName, entryNameLength, ctx->pos));
result = dir_emit(ctx, /* filldir callback struct */
entryName, /* name of dirent */
entryNameLength, /* length of name */
entryIno, /* inode number (0 makes it not show) */
entryType); /* type of dirent */
return result;
}
static int f2fs_readdir(struct file *file, struct dir_context *ctx)
{
struct inode *inode = file_inode(file);
unsigned long npages = dir_blocks(inode);
unsigned int bit_pos = 0;
struct f2fs_dentry_block *dentry_blk = NULL;
struct f2fs_dir_entry *de = NULL;
struct page *dentry_page = NULL;
struct file_ra_state *ra = &file->f_ra;
unsigned int n = ((unsigned long)ctx->pos / NR_DENTRY_IN_BLOCK);
unsigned char d_type = DT_UNKNOWN;
bit_pos = ((unsigned long)ctx->pos % NR_DENTRY_IN_BLOCK);
/* readahead for multi pages of dir */
if (npages - n > 1 && !ra_has_index(ra, n))
page_cache_sync_readahead(inode->i_mapping, ra, file, n,
min(npages - n, (pgoff_t)MAX_DIR_RA_PAGES));
for (; n < npages; n++) {
dentry_page = get_lock_data_page(inode, n);
if (IS_ERR(dentry_page))
continue;
dentry_blk = kmap(dentry_page);
while (bit_pos < NR_DENTRY_IN_BLOCK) {
bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
NR_DENTRY_IN_BLOCK,
bit_pos);
if (bit_pos >= NR_DENTRY_IN_BLOCK)
break;
de = &dentry_blk->dentry[bit_pos];
if (de->file_type < F2FS_FT_MAX)
d_type = f2fs_filetype_table[de->file_type];
else
d_type = DT_UNKNOWN;
if (!dir_emit(ctx,
dentry_blk->filename[bit_pos],
le16_to_cpu(de->name_len),
le32_to_cpu(de->ino), d_type))
goto stop;
bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
ctx->pos = n * NR_DENTRY_IN_BLOCK + bit_pos;
}
bit_pos = 0;
ctx->pos = (n + 1) * NR_DENTRY_IN_BLOCK;
kunmap(dentry_page);
f2fs_put_page(dentry_page, 1);
dentry_page = NULL;
}
stop:
if (dentry_page && !IS_ERR(dentry_page)) {
kunmap(dentry_page);
f2fs_put_page(dentry_page, 1);
}
return 0;
}
/* Inspired by generic filldir in fs/readdir.c */
static int
ecryptfs_filldir(void *dirent, const char *lower_name, int lower_namelen,
loff_t offset, u64 ino, unsigned int d_type)
{
struct ecryptfs_getdents_callback *buf =
(struct ecryptfs_getdents_callback *)dirent;
size_t name_size;
char *name;
int rc;
buf->filldir_called++;
rc = ecryptfs_decode_and_decrypt_filename(&name, &name_size,
buf->sb, lower_name,
lower_namelen);
if (rc) {
printk(KERN_ERR "%s: Error attempting to decode and decrypt "
"filename [%s]; rc = [%d]\n", __func__, lower_name,
rc);
goto out;
}
buf->caller->pos = buf->ctx.pos;
rc = !dir_emit(buf->caller, name, name_size, ino, d_type);
kfree(name);
if (!rc)
buf->entries_written++;
out:
return rc;
}
static int sysfs_readdir(struct file *file, struct dir_context *ctx)
{
struct dentry *dentry = file->f_path.dentry;
struct sysfs_dirent *parent_sd = dentry->d_fsdata;
struct sysfs_dirent *pos = file->private_data;
enum kobj_ns_type type;
const void *ns;
type = sysfs_ns_type(parent_sd);
ns = sysfs_info(dentry->d_sb)->ns[type];
if (!dir_emit_dots(file, ctx))
return 0;
mutex_lock(&sysfs_mutex);
for (pos = sysfs_dir_pos(ns, parent_sd, ctx->pos, pos);
pos;
pos = sysfs_dir_next_pos(ns, parent_sd, ctx->pos, pos)) {
const char *name = pos->s_name;
unsigned int type = dt_type(pos);
int len = strlen(name);
ino_t ino = pos->s_ino;
ctx->pos = pos->s_hash;
file->private_data = sysfs_get(pos);
mutex_unlock(&sysfs_mutex);
if (!dir_emit(ctx, name, len, ino, type))
return 0;
mutex_lock(&sysfs_mutex);
}
mutex_unlock(&sysfs_mutex);
file->private_data = NULL;
ctx->pos = INT_MAX;
return 0;
}
/*
* read the entries from a directory
*/
static int romfs_readdir(struct file *file, struct dir_context *ctx)
{
struct inode *i = file_inode(file);
struct romfs_inode ri;
unsigned long offset, maxoff;
int j, ino, nextfh;
char fsname[ROMFS_MAXFN]; /* XXX dynamic? */
int ret;
maxoff = romfs_maxsize(i->i_sb);
offset = ctx->pos;
if (!offset) {
offset = i->i_ino & ROMFH_MASK;
ret = romfs_dev_read(i->i_sb, offset, &ri, ROMFH_SIZE);
if (ret < 0)
goto out;
offset = be32_to_cpu(ri.spec) & ROMFH_MASK;
}
/* Not really failsafe, but we are read-only... */
for (;;) {
if (!offset || offset >= maxoff) {
offset = maxoff;
ctx->pos = offset;
goto out;
}
ctx->pos = offset;
/* Fetch inode info */
ret = romfs_dev_read(i->i_sb, offset, &ri, ROMFH_SIZE);
if (ret < 0)
goto out;
j = romfs_dev_strnlen(i->i_sb, offset + ROMFH_SIZE,
sizeof(fsname) - 1);
if (j < 0)
goto out;
ret = romfs_dev_read(i->i_sb, offset + ROMFH_SIZE, fsname, j);
if (ret < 0)
goto out;
fsname[j] = '\0';
ino = offset;
nextfh = be32_to_cpu(ri.next);
if ((nextfh & ROMFH_TYPE) == ROMFH_HRD)
ino = be32_to_cpu(ri.spec);
if (!dir_emit(ctx, fsname, j, ino,
romfs_dtype_table[nextfh & ROMFH_TYPE]))
goto out;
offset = nextfh & ROMFH_MASK;
}
out:
return 0;
}
static int simplefs_readdir(struct file *filp, void *dirent, filldir_t filldir)
#endif
{
loff_t pos;
struct inode *inode;
struct super_block *sb;
struct buffer_head *bh;
struct simplefs_inode *sfs_inode;
struct simplefs_dir_record *record;
int i;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 11, 0)
pos = ctx->pos;
#else
pos = filp->f_pos;
#endif
inode = filp->f_dentry->d_inode;
sb = inode->i_sb;
if (pos) {
/* FIXME: We use a hack of reading pos to figure if we have filled in all data.
* We should probably fix this to work in a cursor based model and
* use the tokens correctly to not fill too many data in each cursor based call */
return 0;
}
sfs_inode = SIMPLEFS_INODE(inode);
if (unlikely(!S_ISDIR(sfs_inode->mode))) {
printk(KERN_ERR
"inode [%llu][%lu] for fs object [%s] not a directory\n",
sfs_inode->inode_no, inode->i_ino,
filp->f_dentry->d_name.name);
return -ENOTDIR;
}
bh = sb_bread(sb, sfs_inode->data_block_number);
BUG_ON(!bh);
record = (struct simplefs_dir_record *)bh->b_data;
for (i = 0; i < sfs_inode->dir_children_count; i++) {
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 11, 0)
dir_emit(ctx, record->filename, SIMPLEFS_FILENAME_MAXLEN,
record->inode_no, DT_UNKNOWN);
ctx->pos += sizeof(struct simplefs_dir_record);
#else
filldir(dirent, record->filename, SIMPLEFS_FILENAME_MAXLEN, pos,
record->inode_no, DT_UNKNOWN);
filp->f_pos += sizeof(struct simplefs_dir_record);
#endif
pos += sizeof(struct simplefs_dir_record);
record++;
}
brelse(bh);
return 0;
}
static int v9fs_dir_readdir(struct file *file, struct dir_context *ctx)
{
bool over;
struct p9_wstat st;
int err = 0;
struct p9_fid *fid;
int buflen;
int reclen = 0;
struct p9_rdir *rdir;
struct kvec kvec;
p9_debug(P9_DEBUG_VFS, "name %pD\n", file);
fid = file->private_data;
buflen = fid->clnt->msize - P9_IOHDRSZ;
rdir = v9fs_alloc_rdir_buf(file, buflen);
if (!rdir)
return -ENOMEM;
kvec.iov_base = rdir->buf;
kvec.iov_len = buflen;
while (1) {
if (rdir->tail == rdir->head) {
struct iov_iter to;
int n;
iov_iter_kvec(&to, READ | ITER_KVEC, &kvec, 1, buflen);
n = p9_client_read(file->private_data, ctx->pos, &to,
&err);
if (err)
return err;
rdir->head = 0;
rdir->tail = n;
}
while (rdir->head < rdir->tail) {
p9stat_init(&st);
err = p9stat_read(fid->clnt, rdir->buf + rdir->head,
rdir->tail - rdir->head, &st);
if (err) {
p9_debug(P9_DEBUG_VFS, "returned %d\n", err);
p9stat_free(&st);
return -EIO;
}
reclen = st.size+2;
over = !dir_emit(ctx, st.name, strlen(st.name),
v9fs_qid2ino(&st.qid), dt_type(&st));
p9stat_free(&st);
if (over)
return 0;
rdir->head += reclen;
ctx->pos += reclen;
}
}
}
static int dedupfs_iterate(struct file *filp,
struct dir_context *ctx)
{
loff_t pos;
struct inode *inode;
struct super_block *sb;
struct buffer_head *bh;
struct dedupfs_inode *dfs_inode;
struct dedupfs_file_record *record;
pos = ctx->pos;
inode = file_inode(filp);
sb = inode->i_sb;
printk(KERN_INFO
"We are inside iterate. The pos[%lu], inode_number[%lu]\n",
(long unsigned int)pos, inode->i_ino);
if (pos) {
printk(KERN_INFO "pos seem to be non-zero which means "
"we have already filled in all the details\n");
return 0;
}
dfs_inode = DEDUPFS_INODE(inode);
if(!S_ISDIR(dfs_inode->mode)) {
printk(KERN_ERR
"inode [%d] is not a directory\n",
dfs_inode->inode_no);
return -ENOTDIR;
}
bh = (struct buffer_head *)sb_bread(sb, dfs_inode->data_block_number);
record = (struct dedupfs_file_record *)bh->b_data;
for(int i = 0; i < dfs_inode->dir_children_count; i++) {
printk(KERN_INFO "Got filename: %s\n", record->filename);
dir_emit(ctx, record->filename, DEDUPFS_FILENAME_MAXLEN,
record->inode_no, DT_UNKNOWN);
ctx->pos += sizeof(struct dedupfs_file_record);
record++;
}
brelse(bh);
return 0;
}
/**
* v9fs_dir_readdir_dotl - iterate through a directory
* @file: opened file structure
* @ctx: actor we feed the entries to
*
*/
static int v9fs_dir_readdir_dotl(struct file *file, struct dir_context *ctx)
{
int err = 0;
struct p9_fid *fid;
int buflen;
struct p9_rdir *rdir;
struct p9_dirent curdirent;
p9_debug(P9_DEBUG_VFS, "name %pD\n", file);
fid = file->private_data;
buflen = fid->clnt->msize - P9_READDIRHDRSZ;
rdir = v9fs_alloc_rdir_buf(file, buflen);
if (!rdir)
return -ENOMEM;
while (1) {
if (rdir->tail == rdir->head) {
err = p9_client_readdir(fid, rdir->buf, buflen,
ctx->pos);
if (err <= 0)
return err;
rdir->head = 0;
rdir->tail = err;
}
while (rdir->head < rdir->tail) {
err = p9dirent_read(fid->clnt, rdir->buf + rdir->head,
rdir->tail - rdir->head,
&curdirent);
if (err < 0) {
p9_debug(P9_DEBUG_VFS, "returned %d\n", err);
return -EIO;
}
if (!dir_emit(ctx, curdirent.d_name,
strlen(curdirent.d_name),
v9fs_qid2ino(&curdirent.qid),
curdirent.d_type))
return 0;
ctx->pos = curdirent.d_off;
rdir->head += err;
}
}
}
/* Inspired by generic filldir in fs/readdir.c */
static int
tierfs_filldir(void *dirent, const char *lower_name, int lower_namelen,
loff_t offset, u64 ino, unsigned int d_type)
{
struct tierfs_getdents_callback *buf =
(struct tierfs_getdents_callback *)dirent;
int rc;
TRACE_ENTRY();
buf->filldir_called++;
buf->caller->pos = buf->ctx.pos;
rc = !dir_emit(buf->caller, lower_name, lower_namelen, ino, d_type);
if (!rc)
buf->entries_written++;
TRACE_EXIT();
return rc;
}
static int
nvmm_readdir(struct file *file, struct dir_context *ctx)
{
loff_t pos = ctx->pos;
int err = 0;
struct inode *inode = file_inode(file);
struct super_block *sb = inode->i_sb;
unsigned long offset = pos && ~PAGE_CACHE_MASK;
unsigned char *types = NULL;
char *start_addr, *end_addr;
struct nvmm_dir_entry *nde;
types = nvmm_filetype_table;
/*establish mapping*/
err = nvmm_establish_mapping(inode);
if(pos >= inode->i_size)
goto final;
if(file->f_version != inode->i_version){
if(offset){
offset = 0;
ctx->pos = (loff_t)(NVMM_I(inode)->i_virt_addr);
}
file->f_version = inode->i_version;
}
start_addr = NVMM_I(inode)->i_virt_addr;
end_addr = start_addr + inode->i_size;
if(start_addr >= end_addr)
goto final;
nde = (struct nvmm_dir_entry *)start_addr;
for(;(char *)nde < end_addr;nde = nvmm_next_entry(nde)){
if(nde->rec_len == 0){
nvmm_error(sb, __FUNCTION__, "zero-length directory entry\n");
err = -EIO;
goto final;
}
if(nde->inode){
unsigned char d_type = DT_UNKNOWN;
if(types && nde->file_type < NVMM_FT_MAX)
d_type = types[nde->file_type];
if(!dir_emit(ctx, nde->name, nde->name_len, le64_to_cpu(nde->inode),d_type))
goto final;
}
static int parse_dirplusfile(char *buf, size_t nbytes, struct file *file,
struct dir_context *ctx, u64 attr_version)
{
struct fuse_direntplus *direntplus;
struct fuse_dirent *dirent;
size_t reclen;
int over = 0;
int ret;
while (nbytes >= FUSE_NAME_OFFSET_DIRENTPLUS) {
direntplus = (struct fuse_direntplus *) buf;
dirent = &direntplus->dirent;
reclen = FUSE_DIRENTPLUS_SIZE(direntplus);
if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX)
return -EIO;
if (reclen > nbytes)
break;
if (memchr(dirent->name, '/', dirent->namelen) != NULL)
return -EIO;
if (!over) {
/* We fill entries into dstbuf only as much as
it can hold. But we still continue iterating
over remaining entries to link them. If not,
we need to send a FORGET for each of those
which we did not link.
*/
over = !dir_emit(ctx, dirent->name, dirent->namelen,
dirent->ino, dirent->type);
ctx->pos = dirent->off;
}
buf += reclen;
nbytes -= reclen;
ret = fuse_direntplus_link(file, direntplus, attr_version);
if (ret)
fuse_force_forget(file, direntplus->entry_out.nodeid);
}
return 0;
}
static int sysv_readdir(struct file *file, struct dir_context *ctx)
{
unsigned long pos = ctx->pos;
struct inode *inode = file_inode(file);
struct super_block *sb = inode->i_sb;
unsigned long npages = dir_pages(inode);
unsigned offset;
unsigned long n;
ctx->pos = pos = (pos + SYSV_DIRSIZE-1) & ~(SYSV_DIRSIZE-1);
if (pos >= inode->i_size)
return 0;
offset = pos & ~PAGE_MASK;
n = pos >> PAGE_SHIFT;
for ( ; n < npages; n++, offset = 0) {
char *kaddr, *limit;
struct sysv_dir_entry *de;
struct page *page = dir_get_page(inode, n);
if (IS_ERR(page))
continue;
kaddr = (char *)page_address(page);
de = (struct sysv_dir_entry *)(kaddr+offset);
limit = kaddr + PAGE_SIZE - SYSV_DIRSIZE;
for ( ;(char*)de <= limit; de++, ctx->pos += sizeof(*de)) {
char *name = de->name;
if (!de->inode)
continue;
if (!dir_emit(ctx, name, strnlen(name,SYSV_NAMELEN),
fs16_to_cpu(SYSV_SB(sb), de->inode),
DT_UNKNOWN)) {
dir_put_page(page);
return 0;
}
}
dir_put_page(page);
}
return 0;
}
/* FIXME: readdir currently has it's own dir_walk code. I don't see a good
* way to combine the two copies */
static int logfs_readdir(struct file *file, struct dir_context *ctx)
{
struct inode *dir = file_inode(file);
loff_t pos;
struct page *page;
struct logfs_disk_dentry *dd;
if (ctx->pos < 0)
return -EINVAL;
if (!dir_emit_dots(file, ctx))
return 0;
pos = ctx->pos - 2;
BUG_ON(pos < 0);
for (;; pos++, ctx->pos++) {
bool full;
if (beyond_eof(dir, pos))
break;
if (!logfs_exist_block(dir, pos)) {
/* deleted dentry */
pos = dir_seek_data(dir, pos);
continue;
}
page = read_cache_page(dir->i_mapping, pos,
(filler_t *)logfs_readpage, NULL);
if (IS_ERR(page))
return PTR_ERR(page);
dd = kmap(page);
BUG_ON(dd->namelen == 0);
full = !dir_emit(ctx, (char *)dd->name,
be16_to_cpu(dd->namelen),
be64_to_cpu(dd->ino), dd->type);
kunmap(page);
page_cache_release(page);
if (full)
break;
}
return 0;
}
static int
zpl_snapdir_iterate(struct file *filp, struct dir_context *ctx)
{
zfs_sb_t *zsb = ITOZSB(filp->f_path.dentry->d_inode);
fstrans_cookie_t cookie;
char snapname[MAXNAMELEN];
boolean_t case_conflict;
uint64_t id, pos;
int error = 0;
ZFS_ENTER(zsb);
cookie = spl_fstrans_mark();
if (!dir_emit_dots(filp, ctx))
goto out;
pos = ctx->pos;
while (error == 0) {
dsl_pool_config_enter(dmu_objset_pool(zsb->z_os), FTAG);
error = -dmu_snapshot_list_next(zsb->z_os, MAXNAMELEN,
snapname, &id, &pos, &case_conflict);
dsl_pool_config_exit(dmu_objset_pool(zsb->z_os), FTAG);
if (error)
goto out;
if (!dir_emit(ctx, snapname, strlen(snapname),
ZFSCTL_INO_SHARES - id, DT_DIR))
goto out;
ctx->pos = pos;
}
out:
spl_fstrans_unmark(cookie);
ZFS_EXIT(zsb);
if (error == -ENOENT)
return (0);
return (error);
}
static int parse_dirfile(char *buf, size_t nbytes, struct file *file,
struct dir_context *ctx)
{
while (nbytes >= FUSE_NAME_OFFSET) {
struct fuse_dirent *dirent = (struct fuse_dirent *) buf;
size_t reclen = FUSE_DIRENT_SIZE(dirent);
if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX)
return -EIO;
if (reclen > nbytes)
break;
if (!dir_emit(ctx, dirent->name, dirent->namelen,
dirent->ino, dirent->type))
break;
buf += reclen;
nbytes -= reclen;
ctx->pos = dirent->off;
}
return 0;
}
static int kernfs_fop_readdir(struct file *file, struct dir_context *ctx)
{
struct dentry *dentry = file->f_path.dentry;
struct kernfs_node *parent = dentry->d_fsdata;
struct kernfs_node *pos = file->private_data;
const void *ns = NULL;
if (!dir_emit_dots(file, ctx))
return 0;
mutex_lock(&kernfs_mutex);
if (kernfs_ns_enabled(parent))
ns = kernfs_info(dentry->d_sb)->ns;
for (pos = kernfs_dir_pos(ns, parent, ctx->pos, pos);
pos;
pos = kernfs_dir_next_pos(ns, parent, ctx->pos, pos)) {
const char *name = pos->name;
unsigned int type = dt_type(pos);
int len = strlen(name);
ino_t ino = pos->ino;
ctx->pos = pos->hash;
file->private_data = pos;
kernfs_get(pos);
mutex_unlock(&kernfs_mutex);
if (!dir_emit(ctx, name, len, ino, type))
return 0;
mutex_lock(&kernfs_mutex);
}
mutex_unlock(&kernfs_mutex);
file->private_data = NULL;
ctx->pos = INT_MAX;
return 0;
}
static int jffs2_readdir(struct file *file, struct dir_context *ctx)
{
struct inode *inode = file_inode(file);
struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
struct jffs2_full_dirent *fd;
unsigned long curofs = 1;
jffs2_dbg(1, "jffs2_readdir() for dir_i #%lu\n", inode->i_ino);
if (!dir_emit_dots(file, ctx))
return 0;
mutex_lock(&f->sem);
for (fd = f->dents; fd; fd = fd->next) {
curofs++;
/* First loop: curofs = 2; pos = 2 */
if (curofs < ctx->pos) {
jffs2_dbg(2, "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n",
fd->name, fd->ino, fd->type, curofs, (unsigned long)ctx->pos);
continue;
}
if (!fd->ino) {
jffs2_dbg(2, "Skipping deletion dirent \"%s\"\n",
fd->name);
ctx->pos++;
continue;
}
jffs2_dbg(2, "Dirent %ld: \"%s\", ino #%u, type %d\n",
(unsigned long)ctx->pos, fd->name, fd->ino, fd->type);
if (!dir_emit(ctx, fd->name, strlen(fd->name), fd->ino, fd->type))
break;
ctx->pos++;
}
mutex_unlock(&f->sem);
return 0;
}
static int cifs_filldir(char *find_entry, struct file *file,
struct dir_context *ctx,
char *scratch_buf, unsigned int max_len)
{
struct cifsFileInfo *file_info = file->private_data;
struct super_block *sb = file_inode(file)->i_sb;
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
struct cifs_dirent de = { NULL, };
struct cifs_fattr fattr;
struct qstr name;
int rc = 0;
ino_t ino;
rc = cifs_fill_dirent(&de, find_entry, file_info->srch_inf.info_level,
file_info->srch_inf.unicode);
if (rc)
return rc;
if (de.namelen > max_len) {
cifs_dbg(VFS, "bad search response length %zd past smb end\n",
de.namelen);
return -EINVAL;
}
/* skip . and .. since we added them first */
if (cifs_entry_is_dot(&de, file_info->srch_inf.unicode))
return 0;
if (file_info->srch_inf.unicode) {
struct nls_table *nlt = cifs_sb->local_nls;
int map_type;
map_type = cifs_remap(cifs_sb);
name.name = scratch_buf;
name.len =
cifs_from_utf16((char *)name.name, (__le16 *)de.name,
UNICODE_NAME_MAX,
min_t(size_t, de.namelen,
(size_t)max_len), nlt, map_type);
name.len -= nls_nullsize(nlt);
} else {
name.name = de.name;
name.len = de.namelen;
}
switch (file_info->srch_inf.info_level) {
case SMB_FIND_FILE_UNIX:
cifs_unix_basic_to_fattr(&fattr,
&((FILE_UNIX_INFO *)find_entry)->basic,
cifs_sb);
break;
case SMB_FIND_FILE_INFO_STANDARD:
cifs_std_info_to_fattr(&fattr,
(FIND_FILE_STANDARD_INFO *)find_entry,
cifs_sb);
break;
default:
cifs_dir_info_to_fattr(&fattr,
(FILE_DIRECTORY_INFO *)find_entry,
cifs_sb);
break;
}
if (de.ino && (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
fattr.cf_uniqueid = de.ino;
} else {
fattr.cf_uniqueid = iunique(sb, ROOT_I);
cifs_autodisable_serverino(cifs_sb);
}
if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) &&
couldbe_mf_symlink(&fattr))
/*
* trying to get the type and mode can be slow,
* so just call those regular files for now, and mark
* for reval
*/
fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
cifs_prime_dcache(file->f_path.dentry, &name, &fattr);
ino = cifs_uniqueid_to_ino_t(fattr.cf_uniqueid);
return !dir_emit(ctx, name.name, name.len, ino, fattr.cf_dtype);
}
/**
* vxfs_readdir - read a directory
* @fp: the directory to read
* @retp: return buffer
* @filler: filldir callback
*
* Description:
* vxfs_readdir fills @retp with directory entries from @fp
* using the VFS supplied callback @filler.
*
* Returns:
* Zero.
*/
static int
vxfs_readdir(struct file *fp, struct dir_context *ctx)
{
struct inode *ip = file_inode(fp);
struct super_block *sbp = ip->i_sb;
u_long bsize = sbp->s_blocksize;
loff_t pos, limit;
struct vxfs_sb_info *sbi = VXFS_SBI(sbp);
if (ctx->pos == 0) {
if (!dir_emit_dot(fp, ctx))
goto out;
ctx->pos++;
}
if (ctx->pos == 1) {
if (!dir_emit(ctx, "..", 2, VXFS_INO(ip)->vii_dotdot, DT_DIR))
goto out;
ctx->pos++;
}
limit = VXFS_DIRROUND(ip->i_size);
if (ctx->pos > limit)
goto out;
pos = ctx->pos & ~3L;
while (pos < limit) {
struct page *pp;
char *kaddr;
int pg_ofs = pos & ~PAGE_MASK;
int rc = 0;
pp = vxfs_get_page(ip->i_mapping, pos >> PAGE_SHIFT);
if (IS_ERR(pp))
return -ENOMEM;
kaddr = (char *)page_address(pp);
while (pg_ofs < PAGE_SIZE && pos < limit) {
struct vxfs_direct *de;
if ((pos & (bsize - 1)) < 4) {
struct vxfs_dirblk *dbp =
(struct vxfs_dirblk *)
(kaddr + (pos & ~PAGE_MASK));
int overhead = VXFS_DIRBLKOV(sbi, dbp);
pos += overhead;
pg_ofs += overhead;
}
de = (struct vxfs_direct *)(kaddr + pg_ofs);
if (!de->d_reclen) {
pos += bsize - 1;
pos &= ~(bsize - 1);
break;
}
pg_ofs += fs16_to_cpu(sbi, de->d_reclen);
pos += fs16_to_cpu(sbi, de->d_reclen);
if (!de->d_ino)
continue;
rc = dir_emit(ctx, de->d_name,
fs16_to_cpu(sbi, de->d_namelen),
fs32_to_cpu(sbi, de->d_ino),
DT_UNKNOWN);
if (!rc) {
/* the dir entry was not read, fix pos. */
pos -= fs16_to_cpu(sbi, de->d_reclen);
break;
}
}
vxfs_put_page(pp);
if (!rc)
break;
}
ctx->pos = pos | 2;
out:
return 0;
}
/*
* deal with one block in an AFS directory
*/
static int afs_dir_iterate_block(struct dir_context *ctx,
union afs_dir_block *block,
unsigned blkoff)
{
union afs_dirent *dire;
unsigned offset, next, curr;
size_t nlen;
int tmp;
_enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block);
curr = (ctx->pos - blkoff) / sizeof(union afs_dirent);
/* walk through the block, an entry at a time */
for (offset = AFS_DIRENT_PER_BLOCK - block->pagehdr.nentries;
offset < AFS_DIRENT_PER_BLOCK;
offset = next
) {
next = offset + 1;
/* skip entries marked unused in the bitmap */
if (!(block->pagehdr.bitmap[offset / 8] &
(1 << (offset % 8)))) {
_debug("ENT[%Zu.%u]: unused",
blkoff / sizeof(union afs_dir_block), offset);
if (offset >= curr)
ctx->pos = blkoff +
next * sizeof(union afs_dirent);
continue;
}
/* got a valid entry */
dire = &block->dirents[offset];
nlen = strnlen(dire->u.name,
sizeof(*block) -
offset * sizeof(union afs_dirent));
_debug("ENT[%Zu.%u]: %s %Zu \"%s\"",
blkoff / sizeof(union afs_dir_block), offset,
(offset < curr ? "skip" : "fill"),
nlen, dire->u.name);
/* work out where the next possible entry is */
for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_dirent)) {
if (next >= AFS_DIRENT_PER_BLOCK) {
_debug("ENT[%Zu.%u]:"
" %u travelled beyond end dir block"
" (len %u/%Zu)",
blkoff / sizeof(union afs_dir_block),
offset, next, tmp, nlen);
return -EIO;
}
if (!(block->pagehdr.bitmap[next / 8] &
(1 << (next % 8)))) {
_debug("ENT[%Zu.%u]:"
" %u unmarked extension (len %u/%Zu)",
blkoff / sizeof(union afs_dir_block),
offset, next, tmp, nlen);
return -EIO;
}
_debug("ENT[%Zu.%u]: ext %u/%Zu",
blkoff / sizeof(union afs_dir_block),
next, tmp, nlen);
next++;
}
/* skip if starts before the current position */
if (offset < curr)
continue;
/* found the next entry */
if (!dir_emit(ctx, dire->u.name, nlen,
ntohl(dire->u.vnode),
ctx->actor == afs_lookup_filldir ?
ntohl(dire->u.unique) : DT_UNKNOWN)) {
_leave(" = 0 [full]");
return 0;
}
ctx->pos = blkoff + next * sizeof(union afs_dirent);
}
_leave(" = 1 [more]");
return 1;
}
static int
affs_readdir(struct file *file, struct dir_context *ctx)
{
struct inode *inode = file_inode(file);
struct super_block *sb = inode->i_sb;
struct buffer_head *dir_bh = NULL;
struct buffer_head *fh_bh = NULL;
unsigned char *name;
int namelen;
u32 i;
int hash_pos;
int chain_pos;
u32 ino;
int error = 0;
pr_debug("%s(ino=%lu,f_pos=%llx)\n", __func__, inode->i_ino, ctx->pos);
if (ctx->pos < 2) {
file->private_data = (void *)0;
if (!dir_emit_dots(file, ctx))
return 0;
}
affs_lock_dir(inode);
chain_pos = (ctx->pos - 2) & 0xffff;
hash_pos = (ctx->pos - 2) >> 16;
if (chain_pos == 0xffff) {
affs_warning(sb, "readdir", "More than 65535 entries in chain");
chain_pos = 0;
hash_pos++;
ctx->pos = ((hash_pos << 16) | chain_pos) + 2;
}
dir_bh = affs_bread(sb, inode->i_ino);
if (!dir_bh)
goto out_unlock_dir;
/* If the directory hasn't changed since the last call to readdir(),
* we can jump directly to where we left off.
*/
ino = (u32)(long)file->private_data;
if (ino && file->f_version == inode->i_version) {
pr_debug("readdir() left off=%d\n", ino);
goto inside;
}
ino = be32_to_cpu(AFFS_HEAD(dir_bh)->table[hash_pos]);
for (i = 0; ino && i < chain_pos; i++) {
fh_bh = affs_bread(sb, ino);
if (!fh_bh) {
affs_error(sb, "readdir","Cannot read block %d", i);
error = -EIO;
goto out_brelse_dir;
}
ino = be32_to_cpu(AFFS_TAIL(sb, fh_bh)->hash_chain);
affs_brelse(fh_bh);
fh_bh = NULL;
}
if (ino)
goto inside;
hash_pos++;
for (; hash_pos < AFFS_SB(sb)->s_hashsize; hash_pos++) {
ino = be32_to_cpu(AFFS_HEAD(dir_bh)->table[hash_pos]);
if (!ino)
continue;
ctx->pos = (hash_pos << 16) + 2;
inside:
do {
fh_bh = affs_bread(sb, ino);
if (!fh_bh) {
affs_error(sb, "readdir",
"Cannot read block %d", ino);
break;
}
namelen = min(AFFS_TAIL(sb, fh_bh)->name[0],
(u8)AFFSNAMEMAX);
name = AFFS_TAIL(sb, fh_bh)->name + 1;
pr_debug("readdir(): dir_emit(\"%.*s\", ino=%u), hash=%d, f_pos=%llx\n",
namelen, name, ino, hash_pos, ctx->pos);
if (!dir_emit(ctx, name, namelen, ino, DT_UNKNOWN))
goto done;
ctx->pos++;
ino = be32_to_cpu(AFFS_TAIL(sb, fh_bh)->hash_chain);
affs_brelse(fh_bh);
fh_bh = NULL;
} while (ino);
}
done:
file->f_version = inode->i_version;
file->private_data = (void *)(long)ino;
affs_brelse(fh_bh);
out_brelse_dir:
affs_brelse(dir_bh);
out_unlock_dir:
affs_unlock_dir(inode);
return error;
}
static int ubifs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
bool excl)
{
struct inode *inode;
struct ubifs_info *c = dir->i_sb->s_fs_info;
int err, sz_change = CALC_DENT_SIZE(dentry->d_name.len);
struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
.dirtied_ino = 1 };
struct ubifs_inode *dir_ui = ubifs_inode(dir);
/*
* Budget request settings: new inode, new direntry, changing the
* parent directory inode.
*/
dbg_gen("dent '%pd', mode %#hx in dir ino %lu",
dentry, mode, dir->i_ino);
err = ubifs_budget_space(c, &req);
if (err)
return err;
inode = ubifs_new_inode(c, dir, mode);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
goto out_budg;
}
err = ubifs_init_security(dir, inode, &dentry->d_name);
if (err)
goto out_inode;
mutex_lock(&dir_ui->ui_mutex);
dir->i_size += sz_change;
dir_ui->ui_size = dir->i_size;
dir->i_mtime = dir->i_ctime = inode->i_ctime;
err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 0, 0);
if (err)
goto out_cancel;
mutex_unlock(&dir_ui->ui_mutex);
ubifs_release_budget(c, &req);
insert_inode_hash(inode);
d_instantiate(dentry, inode);
return 0;
out_cancel:
dir->i_size -= sz_change;
dir_ui->ui_size = dir->i_size;
mutex_unlock(&dir_ui->ui_mutex);
out_inode:
make_bad_inode(inode);
iput(inode);
out_budg:
ubifs_release_budget(c, &req);
ubifs_err(c, "cannot create regular file, error %d", err);
return err;
}
/**
* vfs_dent_type - get VFS directory entry type.
* @type: UBIFS directory entry type
*
* This function converts UBIFS directory entry type into VFS directory entry
* type.
*/
static unsigned int vfs_dent_type(uint8_t type)
{
switch (type) {
case UBIFS_ITYPE_REG:
return DT_REG;
case UBIFS_ITYPE_DIR:
return DT_DIR;
case UBIFS_ITYPE_LNK:
return DT_LNK;
case UBIFS_ITYPE_BLK:
return DT_BLK;
case UBIFS_ITYPE_CHR:
return DT_CHR;
case UBIFS_ITYPE_FIFO:
return DT_FIFO;
case UBIFS_ITYPE_SOCK:
return DT_SOCK;
default:
BUG();
}
return 0;
}
/*
* The classical Unix view for directory is that it is a linear array of
* (name, inode number) entries. Linux/VFS assumes this model as well.
* Particularly, 'readdir()' call wants us to return a directory entry offset
* which later may be used to continue 'readdir()'ing the directory or to
* 'seek()' to that specific direntry. Obviously UBIFS does not really fit this
* model because directory entries are identified by keys, which may collide.
*
* UBIFS uses directory entry hash value for directory offsets, so
* 'seekdir()'/'telldir()' may not always work because of possible key
* collisions. But UBIFS guarantees that consecutive 'readdir()' calls work
* properly by means of saving full directory entry name in the private field
* of the file description object.
*
* This means that UBIFS cannot support NFS which requires full
* 'seekdir()'/'telldir()' support.
*/
static int ubifs_readdir(struct file *file, struct dir_context *ctx)
{
int err;
struct qstr nm;
union ubifs_key key;
struct ubifs_dent_node *dent;
struct inode *dir = file_inode(file);
struct ubifs_info *c = dir->i_sb->s_fs_info;
dbg_gen("dir ino %lu, f_pos %#llx", dir->i_ino, ctx->pos);
if (ctx->pos > UBIFS_S_KEY_HASH_MASK || ctx->pos == 2)
/*
* The directory was seek'ed to a senseless position or there
* are no more entries.
*/
return 0;
if (file->f_version == 0) {
/*
* The file was seek'ed, which means that @file->private_data
* is now invalid. This may also be just the first
* 'ubifs_readdir()' invocation, in which case
* @file->private_data is NULL, and the below code is
* basically a no-op.
*/
kfree(file->private_data);
file->private_data = NULL;
}
/*
* 'generic_file_llseek()' unconditionally sets @file->f_version to
* zero, and we use this for detecting whether the file was seek'ed.
*/
file->f_version = 1;
/* File positions 0 and 1 correspond to "." and ".." */
if (ctx->pos < 2) {
ubifs_assert(!file->private_data);
if (!dir_emit_dots(file, ctx))
return 0;
/* Find the first entry in TNC and save it */
lowest_dent_key(c, &key, dir->i_ino);
nm.name = NULL;
dent = ubifs_tnc_next_ent(c, &key, &nm);
if (IS_ERR(dent)) {
err = PTR_ERR(dent);
goto out;
}
ctx->pos = key_hash_flash(c, &dent->key);
file->private_data = dent;
}
dent = file->private_data;
if (!dent) {
/*
* The directory was seek'ed to and is now readdir'ed.
* Find the entry corresponding to @ctx->pos or the closest one.
*/
dent_key_init_hash(c, &key, dir->i_ino, ctx->pos);
nm.name = NULL;
dent = ubifs_tnc_next_ent(c, &key, &nm);
if (IS_ERR(dent)) {
err = PTR_ERR(dent);
goto out;
}
ctx->pos = key_hash_flash(c, &dent->key);
file->private_data = dent;
}
while (1) {
dbg_gen("feed '%s', ino %llu, new f_pos %#x",
dent->name, (unsigned long long)le64_to_cpu(dent->inum),
key_hash_flash(c, &dent->key));
ubifs_assert(le64_to_cpu(dent->ch.sqnum) >
ubifs_inode(dir)->creat_sqnum);
nm.len = le16_to_cpu(dent->nlen);
if (!dir_emit(ctx, dent->name, nm.len,
le64_to_cpu(dent->inum),
vfs_dent_type(dent->type)))
return 0;
/* Switch to the next entry */
key_read(c, &dent->key, &key);
nm.name = dent->name;
dent = ubifs_tnc_next_ent(c, &key, &nm);
if (IS_ERR(dent)) {
err = PTR_ERR(dent);
goto out;
}
kfree(file->private_data);
ctx->pos = key_hash_flash(c, &dent->key);
file->private_data = dent;
cond_resched();
}
out:
if (err != -ENOENT) {
ubifs_err(c, "cannot find next direntry, error %d", err);
return err;
}
kfree(file->private_data);
file->private_data = NULL;
/* 2 is a special value indicating that there are no more direntries */
ctx->pos = 2;
return 0;
}
/*
* routine called when the VFS needs to read the directory contents
*
* @file: the VFS file structure of the directory
* @ctx: directory context
*
* return: 0 on success, error code otherwise
*/
static int wtfs_iterate(struct file * file, struct dir_context * ctx)
{
struct inode * dir_vi = file_inode(file);
struct super_block * vsb = dir_vi->i_sb;
struct wtfs_inode_info * info = WTFS_INODE_INFO(dir_vi);
struct wtfs_dir_block * block = NULL;
struct buffer_head * bh = NULL;
uint64_t count, offset, next, inode_no;
char * filename = NULL;
int i, j, k;
int ret = -EINVAL;
/* calculate how many entries we have counted, including null entries */
count = ctx->pos / sizeof(struct wtfs_dentry);
offset = ctx->pos % sizeof(struct wtfs_dentry);
if (offset != 0) {
wtfs_error("bad position %llu at %s:%lu\n", ctx->pos,
dir_vi->i_sb->s_id, dir_vi->i_ino);
goto error;
}
/* do iterate */
next = info->first_block;
i = 0; /* valid entry counter */
j = 0; /* total entry counter, including null ones */
while (next != 0) {
if ((bh = sb_bread(vsb, next)) == NULL) {
wtfs_error("unable to read the block %llu\n", next);
goto error;
}
block = (struct wtfs_dir_block *)bh->b_data;
for (k = 0; k < WTFS_DENTRY_COUNT_PER_BLOCK; ++k) {
inode_no = wtfs64_to_cpu(block->entries[k].inode_no);
filename = block->entries[k].filename;
if (inode_no != 0) {
if (j >= count && i < info->dir_entry_count) {
wtfs_debug("emitting entry '%s' of "
"inode %llu\n",
filename, inode_no);
if (dir_emit(ctx, filename,
strnlen(filename,
WTFS_FILENAME_MAX),
inode_no, DT_UNKNOWN) == 0) {
brelse(bh);
return 0;
}
}
++i;
}
++j;
ctx->pos += sizeof(struct wtfs_dentry);
}
next = wtfs64_to_cpu(block->next);
brelse(bh);
}
return 0;
error:
if (bh != NULL) {
brelse(bh);
}
return ret;
}
static int sf_dir_read(struct file *dir, void *opaque, filldir_t filldir)
#endif
{
TRACE();
for (;;)
{
int err;
ino_t fake_ino;
loff_t sanity;
char d_name[NAME_MAX];
int d_type = DT_UNKNOWN;
err = sf_getdent(dir, d_name, &d_type);
switch (err)
{
case 1:
return 0;
case 0:
break;
case -1:
default:
/* skip erroneous entry and proceed */
LogFunc(("sf_getdent error %d\n", err));
dir->f_pos += 1;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 11, 0)
ctx->pos += 1;
#endif
continue;
}
/* d_name now contains a valid entry name */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 11, 0)
sanity = ctx->pos + 0xbeef;
#else
sanity = dir->f_pos + 0xbeef;
#endif
fake_ino = sanity;
if (sanity - fake_ino)
{
LogRelFunc(("can not compute ino\n"));
return -EINVAL;
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 11, 0)
if (!dir_emit(ctx, d_name, strlen(d_name), fake_ino, d_type))
{
LogFunc(("dir_emit failed\n"));
return 0;
}
#else
err = filldir(opaque, d_name, strlen(d_name), dir->f_pos, fake_ino, d_type);
if (err)
{
LogFunc(("filldir returned error %d\n", err));
/* Rely on the fact that filldir returns error
only when it runs out of space in opaque */
return 0;
}
#endif
dir->f_pos += 1;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 11, 0)
ctx->pos += 1;
#endif
}
BUG();
}
/*
* So this function is called when the volume is mkfsed with
* dir_index disabled. In order to keep f_pos persistent
* after we convert from an inlined dir to a blocked based,
* we just pretend that we are a normal dir and return the
* offset as if '.' and '..' really take place.
*
*/
int ext4_read_inline_dir(struct file *file,
struct dir_context *ctx,
int *has_inline_data)
{
unsigned int offset, parent_ino;
int i;
struct ext4_dir_entry_2 *de;
struct super_block *sb;
struct inode *inode = file_inode(file);
int ret, inline_size = 0;
struct ext4_iloc iloc;
void *dir_buf = NULL;
int dotdot_offset, dotdot_size, extra_offset, extra_size;
ret = ext4_get_inode_loc(inode, &iloc);
if (ret)
return ret;
down_read(&EXT4_I(inode)->xattr_sem);
if (!ext4_has_inline_data(inode)) {
up_read(&EXT4_I(inode)->xattr_sem);
*has_inline_data = 0;
goto out;
}
inline_size = ext4_get_inline_size(inode);
dir_buf = kmalloc(inline_size, GFP_NOFS);
if (!dir_buf) {
ret = -ENOMEM;
up_read(&EXT4_I(inode)->xattr_sem);
goto out;
}
ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
up_read(&EXT4_I(inode)->xattr_sem);
if (ret < 0)
goto out;
ret = 0;
sb = inode->i_sb;
parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
offset = ctx->pos;
/*
* dotdot_offset and dotdot_size is the real offset and
* size for ".." and "." if the dir is block based while
* the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
* So we will use extra_offset and extra_size to indicate them
* during the inline dir iteration.
*/
dotdot_offset = EXT4_DIR_REC_LEN(1);
dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
extra_size = extra_offset + inline_size;
/*
* If the version has changed since the last call to
* readdir(2), then we might be pointing to an invalid
* dirent right now. Scan from the start of the inline
* dir to make sure.
*/
if (file->f_version != inode->i_version) {
for (i = 0; i < extra_size && i < offset;) {
/*
* "." is with offset 0 and
* ".." is dotdot_offset.
*/
if (!i) {
i = dotdot_offset;
continue;
} else if (i == dotdot_offset) {
i = dotdot_size;
continue;
}
/* for other entry, the real offset in
* the buf has to be tuned accordingly.
*/
de = (struct ext4_dir_entry_2 *)
(dir_buf + i - extra_offset);
/* It's too expensive to do a full
* dirent test each time round this
* loop, but we do have to test at
* least that it is non-zero. A
* failure will be detected in the
* dirent test below. */
if (ext4_rec_len_from_disk(de->rec_len, extra_size)
< EXT4_DIR_REC_LEN(1))
break;
i += ext4_rec_len_from_disk(de->rec_len,
extra_size);
}
offset = i;
ctx->pos = offset;
file->f_version = inode->i_version;
}
while (ctx->pos < extra_size) {
if (ctx->pos == 0) {
if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
goto out;
ctx->pos = dotdot_offset;
continue;
}
if (ctx->pos == dotdot_offset) {
if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
goto out;
ctx->pos = dotdot_size;
continue;
}
de = (struct ext4_dir_entry_2 *)
(dir_buf + ctx->pos - extra_offset);
if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
extra_size, ctx->pos))
goto out;
if (le32_to_cpu(de->inode)) {
if (!dir_emit(ctx, de->name, de->name_len,
le32_to_cpu(de->inode),
get_dtype(sb, de->file_type)))
goto out;
}
ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
}
out:
kfree(dir_buf);
brelse(iloc.bh);
return ret;
}
int /* error */
xfs_dir2_sf_getdents(
xfs_inode_t *dp, /* incore directory inode */
struct dir_context *ctx)
{
int i; /* shortform entry number */
xfs_mount_t *mp; /* filesystem mount point */
xfs_dir2_dataptr_t off; /* current entry's offset */
xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */
xfs_dir2_sf_hdr_t *sfp; /* shortform structure */
xfs_dir2_dataptr_t dot_offset;
xfs_dir2_dataptr_t dotdot_offset;
xfs_ino_t ino;
mp = dp->i_mount;
ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
/*
* Give up if the directory is way too short.
*/
if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
ASSERT(XFS_FORCED_SHUTDOWN(mp));
return XFS_ERROR(EIO);
}
ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
ASSERT(dp->i_df.if_u1.if_data != NULL);
sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->i8count));
/*
* If the block number in the offset is out of range, we're done.
*/
if (xfs_dir2_dataptr_to_db(mp, ctx->pos) > mp->m_dirdatablk)
return 0;
/*
* Precalculate offsets for . and .. as we will always need them.
*
* XXX(hch): the second argument is sometimes 0 and sometimes
* mp->m_dirdatablk.
*/
dot_offset = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk,
XFS_DIR3_DATA_DOT_OFFSET(mp));
dotdot_offset = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk,
XFS_DIR3_DATA_DOTDOT_OFFSET(mp));
/*
* Put . entry unless we're starting past it.
*/
if (ctx->pos <= dot_offset) {
ctx->pos = dot_offset & 0x7fffffff;
if (!dir_emit(ctx, ".", 1, dp->i_ino, DT_DIR))
return 0;
}
/*
* Put .. entry unless we're starting past it.
*/
if (ctx->pos <= dotdot_offset) {
ino = xfs_dir2_sf_get_parent_ino(sfp);
ctx->pos = dotdot_offset & 0x7fffffff;
if (!dir_emit(ctx, "..", 2, ino, DT_DIR))
return 0;
}
/*
* Loop while there are more entries and put'ing works.
*/
sfep = xfs_dir2_sf_firstentry(sfp);
for (i = 0; i < sfp->count; i++) {
off = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk,
xfs_dir2_sf_get_offset(sfep));
if (ctx->pos > off) {
sfep = xfs_dir2_sf_nextentry(sfp, sfep);
continue;
}
ino = xfs_dir2_sfe_get_ino(sfp, sfep);
ctx->pos = off & 0x7fffffff;
if (!dir_emit(ctx, (char *)sfep->name, sfep->namelen,
ino, DT_UNKNOWN))
return 0;
sfep = xfs_dir2_sf_nextentry(sfp, sfep);
}
ctx->pos = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk + 1, 0) &
0x7fffffff;
return 0;
}
