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fuse: split out readdir.c
Directory reading code is about to grow larger, so split it out from dir.c into a new source file. Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi
parent
be2ff42c5d
commit
d123d8e183
@ -5,4 +5,4 @@
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obj-$(CONFIG_FUSE_FS) += fuse.o
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obj-$(CONFIG_CUSE) += cuse.o
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fuse-objs := dev.o dir.o file.o inode.o control.o xattr.o acl.o
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fuse-objs := dev.o dir.o file.o inode.o control.o xattr.o acl.o readdir.o
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259
fs/fuse/dir.c
259
fs/fuse/dir.c
@ -16,22 +16,6 @@
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#include <linux/xattr.h>
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#include <linux/posix_acl.h>
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static bool fuse_use_readdirplus(struct inode *dir, struct dir_context *ctx)
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{
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struct fuse_conn *fc = get_fuse_conn(dir);
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struct fuse_inode *fi = get_fuse_inode(dir);
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if (!fc->do_readdirplus)
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return false;
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if (!fc->readdirplus_auto)
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return true;
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if (test_and_clear_bit(FUSE_I_ADVISE_RDPLUS, &fi->state))
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return true;
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if (ctx->pos == 0)
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return true;
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return false;
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}
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static void fuse_advise_use_readdirplus(struct inode *dir)
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{
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struct fuse_inode *fi = get_fuse_inode(dir);
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@ -80,8 +64,7 @@ static u64 time_to_jiffies(u64 sec, u32 nsec)
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* Set dentry and possibly attribute timeouts from the lookup/mk*
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* replies
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*/
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static void fuse_change_entry_timeout(struct dentry *entry,
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struct fuse_entry_out *o)
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void fuse_change_entry_timeout(struct dentry *entry, struct fuse_entry_out *o)
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{
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fuse_dentry_settime(entry,
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time_to_jiffies(o->entry_valid, o->entry_valid_nsec));
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@ -92,7 +75,7 @@ static u64 attr_timeout(struct fuse_attr_out *o)
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return time_to_jiffies(o->attr_valid, o->attr_valid_nsec);
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}
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static u64 entry_attr_timeout(struct fuse_entry_out *o)
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u64 entry_attr_timeout(struct fuse_entry_out *o)
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{
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return time_to_jiffies(o->attr_valid, o->attr_valid_nsec);
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}
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@ -262,11 +245,6 @@ invalid:
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goto out;
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}
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static int invalid_nodeid(u64 nodeid)
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{
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return !nodeid || nodeid == FUSE_ROOT_ID;
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}
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static int fuse_dentry_init(struct dentry *dentry)
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{
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dentry->d_fsdata = kzalloc(sizeof(union fuse_dentry), GFP_KERNEL);
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@ -1165,239 +1143,6 @@ static int fuse_permission(struct inode *inode, int mask)
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return err;
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}
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static int parse_dirfile(char *buf, size_t nbytes, struct file *file,
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struct dir_context *ctx)
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{
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while (nbytes >= FUSE_NAME_OFFSET) {
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struct fuse_dirent *dirent = (struct fuse_dirent *) buf;
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size_t reclen = FUSE_DIRENT_SIZE(dirent);
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if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX)
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return -EIO;
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if (reclen > nbytes)
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break;
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if (memchr(dirent->name, '/', dirent->namelen) != NULL)
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return -EIO;
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if (!dir_emit(ctx, dirent->name, dirent->namelen,
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dirent->ino, dirent->type))
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break;
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buf += reclen;
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nbytes -= reclen;
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ctx->pos = dirent->off;
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}
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return 0;
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}
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static int fuse_direntplus_link(struct file *file,
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struct fuse_direntplus *direntplus,
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u64 attr_version)
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{
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struct fuse_entry_out *o = &direntplus->entry_out;
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struct fuse_dirent *dirent = &direntplus->dirent;
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struct dentry *parent = file->f_path.dentry;
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struct qstr name = QSTR_INIT(dirent->name, dirent->namelen);
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struct dentry *dentry;
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struct dentry *alias;
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struct inode *dir = d_inode(parent);
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struct fuse_conn *fc;
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struct inode *inode;
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DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
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if (!o->nodeid) {
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/*
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* Unlike in the case of fuse_lookup, zero nodeid does not mean
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* ENOENT. Instead, it only means the userspace filesystem did
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* not want to return attributes/handle for this entry.
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*
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* So do nothing.
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*/
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return 0;
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}
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if (name.name[0] == '.') {
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/*
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* We could potentially refresh the attributes of the directory
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* and its parent?
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*/
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if (name.len == 1)
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return 0;
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if (name.name[1] == '.' && name.len == 2)
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return 0;
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}
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if (invalid_nodeid(o->nodeid))
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return -EIO;
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if (!fuse_valid_type(o->attr.mode))
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return -EIO;
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fc = get_fuse_conn(dir);
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name.hash = full_name_hash(parent, name.name, name.len);
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dentry = d_lookup(parent, &name);
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if (!dentry) {
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retry:
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dentry = d_alloc_parallel(parent, &name, &wq);
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if (IS_ERR(dentry))
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return PTR_ERR(dentry);
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}
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if (!d_in_lookup(dentry)) {
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struct fuse_inode *fi;
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inode = d_inode(dentry);
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if (!inode ||
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get_node_id(inode) != o->nodeid ||
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((o->attr.mode ^ inode->i_mode) & S_IFMT)) {
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d_invalidate(dentry);
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dput(dentry);
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goto retry;
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}
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if (is_bad_inode(inode)) {
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dput(dentry);
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return -EIO;
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}
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fi = get_fuse_inode(inode);
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spin_lock(&fc->lock);
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fi->nlookup++;
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spin_unlock(&fc->lock);
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forget_all_cached_acls(inode);
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fuse_change_attributes(inode, &o->attr,
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entry_attr_timeout(o),
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attr_version);
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/*
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* The other branch comes via fuse_iget()
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* which bumps nlookup inside
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*/
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} else {
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inode = fuse_iget(dir->i_sb, o->nodeid, o->generation,
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&o->attr, entry_attr_timeout(o),
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attr_version);
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if (!inode)
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inode = ERR_PTR(-ENOMEM);
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alias = d_splice_alias(inode, dentry);
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d_lookup_done(dentry);
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if (alias) {
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dput(dentry);
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dentry = alias;
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}
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if (IS_ERR(dentry))
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return PTR_ERR(dentry);
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}
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if (fc->readdirplus_auto)
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set_bit(FUSE_I_INIT_RDPLUS, &get_fuse_inode(inode)->state);
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fuse_change_entry_timeout(dentry, o);
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dput(dentry);
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return 0;
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}
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static int parse_dirplusfile(char *buf, size_t nbytes, struct file *file,
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struct dir_context *ctx, u64 attr_version)
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{
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struct fuse_direntplus *direntplus;
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struct fuse_dirent *dirent;
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size_t reclen;
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int over = 0;
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int ret;
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while (nbytes >= FUSE_NAME_OFFSET_DIRENTPLUS) {
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direntplus = (struct fuse_direntplus *) buf;
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dirent = &direntplus->dirent;
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reclen = FUSE_DIRENTPLUS_SIZE(direntplus);
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if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX)
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return -EIO;
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if (reclen > nbytes)
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break;
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if (memchr(dirent->name, '/', dirent->namelen) != NULL)
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return -EIO;
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if (!over) {
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/* We fill entries into dstbuf only as much as
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it can hold. But we still continue iterating
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over remaining entries to link them. If not,
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we need to send a FORGET for each of those
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which we did not link.
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*/
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over = !dir_emit(ctx, dirent->name, dirent->namelen,
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dirent->ino, dirent->type);
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if (!over)
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ctx->pos = dirent->off;
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}
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buf += reclen;
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nbytes -= reclen;
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ret = fuse_direntplus_link(file, direntplus, attr_version);
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if (ret)
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fuse_force_forget(file, direntplus->entry_out.nodeid);
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}
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return 0;
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}
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static int fuse_readdir(struct file *file, struct dir_context *ctx)
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{
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int plus, err;
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size_t nbytes;
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struct page *page;
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struct inode *inode = file_inode(file);
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struct fuse_conn *fc = get_fuse_conn(inode);
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struct fuse_req *req;
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u64 attr_version = 0;
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bool locked;
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if (is_bad_inode(inode))
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return -EIO;
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req = fuse_get_req(fc, 1);
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if (IS_ERR(req))
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return PTR_ERR(req);
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page = alloc_page(GFP_KERNEL);
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if (!page) {
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fuse_put_request(fc, req);
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return -ENOMEM;
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}
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plus = fuse_use_readdirplus(inode, ctx);
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req->out.argpages = 1;
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req->num_pages = 1;
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req->pages[0] = page;
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req->page_descs[0].length = PAGE_SIZE;
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if (plus) {
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attr_version = fuse_get_attr_version(fc);
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fuse_read_fill(req, file, ctx->pos, PAGE_SIZE,
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FUSE_READDIRPLUS);
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} else {
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fuse_read_fill(req, file, ctx->pos, PAGE_SIZE,
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FUSE_READDIR);
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}
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locked = fuse_lock_inode(inode);
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fuse_request_send(fc, req);
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fuse_unlock_inode(inode, locked);
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nbytes = req->out.args[0].size;
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err = req->out.h.error;
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fuse_put_request(fc, req);
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if (!err) {
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if (plus) {
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err = parse_dirplusfile(page_address(page), nbytes,
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file, ctx,
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attr_version);
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} else {
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err = parse_dirfile(page_address(page), nbytes, file,
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ctx);
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}
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}
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__free_page(page);
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fuse_invalidate_atime(inode);
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return err;
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}
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static const char *fuse_get_link(struct dentry *dentry,
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struct inode *inode,
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struct delayed_call *done)
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@ -704,6 +704,11 @@ static inline u64 get_node_id(struct inode *inode)
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return get_fuse_inode(inode)->nodeid;
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}
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static inline int invalid_nodeid(u64 nodeid)
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{
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return !nodeid || nodeid == FUSE_ROOT_ID;
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}
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/** Device operations */
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extern const struct file_operations fuse_dev_operations;
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@ -878,6 +883,9 @@ void fuse_invalidate_entry_cache(struct dentry *entry);
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void fuse_invalidate_atime(struct inode *inode);
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u64 entry_attr_timeout(struct fuse_entry_out *o);
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void fuse_change_entry_timeout(struct dentry *entry, struct fuse_entry_out *o);
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/**
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* Acquire reference to fuse_conn
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*/
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@ -997,4 +1005,8 @@ struct posix_acl;
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struct posix_acl *fuse_get_acl(struct inode *inode, int type);
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int fuse_set_acl(struct inode *inode, struct posix_acl *acl, int type);
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/* readdir.c */
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int fuse_readdir(struct file *file, struct dir_context *ctx);
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#endif /* _FS_FUSE_I_H */
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259
fs/fuse/readdir.c
Normal file
259
fs/fuse/readdir.c
Normal file
@ -0,0 +1,259 @@
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/*
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FUSE: Filesystem in Userspace
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Copyright (C) 2001-2018 Miklos Szeredi <miklos@szeredi.hu>
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This program can be distributed under the terms of the GNU GPL.
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See the file COPYING.
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*/
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#include "fuse_i.h"
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#include <linux/posix_acl.h>
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static bool fuse_use_readdirplus(struct inode *dir, struct dir_context *ctx)
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{
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struct fuse_conn *fc = get_fuse_conn(dir);
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struct fuse_inode *fi = get_fuse_inode(dir);
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if (!fc->do_readdirplus)
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return false;
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if (!fc->readdirplus_auto)
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return true;
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if (test_and_clear_bit(FUSE_I_ADVISE_RDPLUS, &fi->state))
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return true;
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if (ctx->pos == 0)
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return true;
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return false;
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}
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static int parse_dirfile(char *buf, size_t nbytes, struct file *file,
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struct dir_context *ctx)
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{
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while (nbytes >= FUSE_NAME_OFFSET) {
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struct fuse_dirent *dirent = (struct fuse_dirent *) buf;
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size_t reclen = FUSE_DIRENT_SIZE(dirent);
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if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX)
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return -EIO;
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if (reclen > nbytes)
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break;
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if (memchr(dirent->name, '/', dirent->namelen) != NULL)
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return -EIO;
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if (!dir_emit(ctx, dirent->name, dirent->namelen,
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dirent->ino, dirent->type))
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break;
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buf += reclen;
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nbytes -= reclen;
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ctx->pos = dirent->off;
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}
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return 0;
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}
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static int fuse_direntplus_link(struct file *file,
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struct fuse_direntplus *direntplus,
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u64 attr_version)
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{
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struct fuse_entry_out *o = &direntplus->entry_out;
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struct fuse_dirent *dirent = &direntplus->dirent;
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struct dentry *parent = file->f_path.dentry;
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struct qstr name = QSTR_INIT(dirent->name, dirent->namelen);
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struct dentry *dentry;
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struct dentry *alias;
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struct inode *dir = d_inode(parent);
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struct fuse_conn *fc;
|
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struct inode *inode;
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DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
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|
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if (!o->nodeid) {
|
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/*
|
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* Unlike in the case of fuse_lookup, zero nodeid does not mean
|
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* ENOENT. Instead, it only means the userspace filesystem did
|
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* not want to return attributes/handle for this entry.
|
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*
|
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* So do nothing.
|
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*/
|
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return 0;
|
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}
|
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|
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if (name.name[0] == '.') {
|
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/*
|
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* We could potentially refresh the attributes of the directory
|
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* and its parent?
|
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*/
|
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if (name.len == 1)
|
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return 0;
|
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if (name.name[1] == '.' && name.len == 2)
|
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return 0;
|
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}
|
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|
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if (invalid_nodeid(o->nodeid))
|
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return -EIO;
|
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if (!fuse_valid_type(o->attr.mode))
|
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return -EIO;
|
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|
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fc = get_fuse_conn(dir);
|
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|
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name.hash = full_name_hash(parent, name.name, name.len);
|
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dentry = d_lookup(parent, &name);
|
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if (!dentry) {
|
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retry:
|
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dentry = d_alloc_parallel(parent, &name, &wq);
|
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if (IS_ERR(dentry))
|
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return PTR_ERR(dentry);
|
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}
|
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if (!d_in_lookup(dentry)) {
|
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struct fuse_inode *fi;
|
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inode = d_inode(dentry);
|
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if (!inode ||
|
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get_node_id(inode) != o->nodeid ||
|
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((o->attr.mode ^ inode->i_mode) & S_IFMT)) {
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d_invalidate(dentry);
|
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dput(dentry);
|
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goto retry;
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}
|
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if (is_bad_inode(inode)) {
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dput(dentry);
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return -EIO;
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}
|
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|
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fi = get_fuse_inode(inode);
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spin_lock(&fc->lock);
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fi->nlookup++;
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spin_unlock(&fc->lock);
|
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|
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forget_all_cached_acls(inode);
|
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fuse_change_attributes(inode, &o->attr,
|
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entry_attr_timeout(o),
|
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attr_version);
|
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/*
|
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* The other branch comes via fuse_iget()
|
||||
* which bumps nlookup inside
|
||||
*/
|
||||
} else {
|
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inode = fuse_iget(dir->i_sb, o->nodeid, o->generation,
|
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&o->attr, entry_attr_timeout(o),
|
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attr_version);
|
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if (!inode)
|
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inode = ERR_PTR(-ENOMEM);
|
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|
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alias = d_splice_alias(inode, dentry);
|
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d_lookup_done(dentry);
|
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if (alias) {
|
||||
dput(dentry);
|
||||
dentry = alias;
|
||||
}
|
||||
if (IS_ERR(dentry))
|
||||
return PTR_ERR(dentry);
|
||||
}
|
||||
if (fc->readdirplus_auto)
|
||||
set_bit(FUSE_I_INIT_RDPLUS, &get_fuse_inode(inode)->state);
|
||||
fuse_change_entry_timeout(dentry, o);
|
||||
|
||||
dput(dentry);
|
||||
return 0;
|
||||
}
|
||||
|
||||
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);
|
||||
if (!over)
|
||||
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;
|
||||
}
|
||||
|
||||
int fuse_readdir(struct file *file, struct dir_context *ctx)
|
||||
{
|
||||
int plus, err;
|
||||
size_t nbytes;
|
||||
struct page *page;
|
||||
struct inode *inode = file_inode(file);
|
||||
struct fuse_conn *fc = get_fuse_conn(inode);
|
||||
struct fuse_req *req;
|
||||
u64 attr_version = 0;
|
||||
bool locked;
|
||||
|
||||
if (is_bad_inode(inode))
|
||||
return -EIO;
|
||||
|
||||
req = fuse_get_req(fc, 1);
|
||||
if (IS_ERR(req))
|
||||
return PTR_ERR(req);
|
||||
|
||||
page = alloc_page(GFP_KERNEL);
|
||||
if (!page) {
|
||||
fuse_put_request(fc, req);
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
plus = fuse_use_readdirplus(inode, ctx);
|
||||
req->out.argpages = 1;
|
||||
req->num_pages = 1;
|
||||
req->pages[0] = page;
|
||||
req->page_descs[0].length = PAGE_SIZE;
|
||||
if (plus) {
|
||||
attr_version = fuse_get_attr_version(fc);
|
||||
fuse_read_fill(req, file, ctx->pos, PAGE_SIZE,
|
||||
FUSE_READDIRPLUS);
|
||||
} else {
|
||||
fuse_read_fill(req, file, ctx->pos, PAGE_SIZE,
|
||||
FUSE_READDIR);
|
||||
}
|
||||
locked = fuse_lock_inode(inode);
|
||||
fuse_request_send(fc, req);
|
||||
fuse_unlock_inode(inode, locked);
|
||||
nbytes = req->out.args[0].size;
|
||||
err = req->out.h.error;
|
||||
fuse_put_request(fc, req);
|
||||
if (!err) {
|
||||
if (plus) {
|
||||
err = parse_dirplusfile(page_address(page), nbytes,
|
||||
file, ctx, attr_version);
|
||||
} else {
|
||||
err = parse_dirfile(page_address(page), nbytes, file,
|
||||
ctx);
|
||||
}
|
||||
}
|
||||
|
||||
__free_page(page);
|
||||
fuse_invalidate_atime(inode);
|
||||
return err;
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user