From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/fs/hfs/dir.c | 319 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 319 insertions(+) create mode 100644 kernel/fs/hfs/dir.c (limited to 'kernel/fs/hfs/dir.c') diff --git a/kernel/fs/hfs/dir.c b/kernel/fs/hfs/dir.c new file mode 100644 index 000000000..70788e038 --- /dev/null +++ b/kernel/fs/hfs/dir.c @@ -0,0 +1,319 @@ +/* + * linux/fs/hfs/dir.c + * + * Copyright (C) 1995-1997 Paul H. Hargrove + * (C) 2003 Ardis Technologies + * This file may be distributed under the terms of the GNU General Public License. + * + * This file contains directory-related functions independent of which + * scheme is being used to represent forks. + * + * Based on the minix file system code, (C) 1991, 1992 by Linus Torvalds + */ + +#include "hfs_fs.h" +#include "btree.h" + +/* + * hfs_lookup() + */ +static struct dentry *hfs_lookup(struct inode *dir, struct dentry *dentry, + unsigned int flags) +{ + hfs_cat_rec rec; + struct hfs_find_data fd; + struct inode *inode = NULL; + int res; + + res = hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd); + if (res) + return ERR_PTR(res); + hfs_cat_build_key(dir->i_sb, fd.search_key, dir->i_ino, &dentry->d_name); + res = hfs_brec_read(&fd, &rec, sizeof(rec)); + if (res) { + hfs_find_exit(&fd); + if (res == -ENOENT) { + /* No such entry */ + inode = NULL; + goto done; + } + return ERR_PTR(res); + } + inode = hfs_iget(dir->i_sb, &fd.search_key->cat, &rec); + hfs_find_exit(&fd); + if (!inode) + return ERR_PTR(-EACCES); +done: + d_add(dentry, inode); + return NULL; +} + +/* + * hfs_readdir + */ +static int hfs_readdir(struct file *file, struct dir_context *ctx) +{ + struct inode *inode = file_inode(file); + struct super_block *sb = inode->i_sb; + int len, err; + char strbuf[HFS_MAX_NAMELEN]; + union hfs_cat_rec entry; + struct hfs_find_data fd; + struct hfs_readdir_data *rd; + u16 type; + + if (ctx->pos >= inode->i_size) + return 0; + + err = hfs_find_init(HFS_SB(sb)->cat_tree, &fd); + if (err) + return err; + hfs_cat_build_key(sb, fd.search_key, inode->i_ino, NULL); + err = hfs_brec_find(&fd); + if (err) + goto out; + + if (ctx->pos == 0) { + /* This is completely artificial... */ + if (!dir_emit_dot(file, ctx)) + goto out; + ctx->pos = 1; + } + if (ctx->pos == 1) { + if (fd.entrylength > sizeof(entry) || fd.entrylength < 0) { + err = -EIO; + goto out; + } + + hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, fd.entrylength); + if (entry.type != HFS_CDR_THD) { + pr_err("bad catalog folder thread\n"); + err = -EIO; + goto out; + } + //if (fd.entrylength < HFS_MIN_THREAD_SZ) { + // pr_err("truncated catalog thread\n"); + // err = -EIO; + // goto out; + //} + if (!dir_emit(ctx, "..", 2, + be32_to_cpu(entry.thread.ParID), DT_DIR)) + goto out; + ctx->pos = 2; + } + if (ctx->pos >= inode->i_size) + goto out; + err = hfs_brec_goto(&fd, ctx->pos - 1); + if (err) + goto out; + + for (;;) { + if (be32_to_cpu(fd.key->cat.ParID) != inode->i_ino) { + pr_err("walked past end of dir\n"); + err = -EIO; + goto out; + } + + if (fd.entrylength > sizeof(entry) || fd.entrylength < 0) { + err = -EIO; + goto out; + } + + hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, fd.entrylength); + type = entry.type; + len = hfs_mac2asc(sb, strbuf, &fd.key->cat.CName); + if (type == HFS_CDR_DIR) { + if (fd.entrylength < sizeof(struct hfs_cat_dir)) { + pr_err("small dir entry\n"); + err = -EIO; + goto out; + } + if (!dir_emit(ctx, strbuf, len, + be32_to_cpu(entry.dir.DirID), DT_DIR)) + break; + } else if (type == HFS_CDR_FIL) { + if (fd.entrylength < sizeof(struct hfs_cat_file)) { + pr_err("small file entry\n"); + err = -EIO; + goto out; + } + if (!dir_emit(ctx, strbuf, len, + be32_to_cpu(entry.file.FlNum), DT_REG)) + break; + } else { + pr_err("bad catalog entry type %d\n", type); + err = -EIO; + goto out; + } + ctx->pos++; + if (ctx->pos >= inode->i_size) + goto out; + err = hfs_brec_goto(&fd, 1); + if (err) + goto out; + } + rd = file->private_data; + if (!rd) { + rd = kmalloc(sizeof(struct hfs_readdir_data), GFP_KERNEL); + if (!rd) { + err = -ENOMEM; + goto out; + } + file->private_data = rd; + rd->file = file; + list_add(&rd->list, &HFS_I(inode)->open_dir_list); + } + memcpy(&rd->key, &fd.key, sizeof(struct hfs_cat_key)); +out: + hfs_find_exit(&fd); + return err; +} + +static int hfs_dir_release(struct inode *inode, struct file *file) +{ + struct hfs_readdir_data *rd = file->private_data; + if (rd) { + mutex_lock(&inode->i_mutex); + list_del(&rd->list); + mutex_unlock(&inode->i_mutex); + kfree(rd); + } + return 0; +} + +/* + * hfs_create() + * + * This is the create() entry in the inode_operations structure for + * regular HFS directories. The purpose is to create a new file in + * a directory and return a corresponding inode, given the inode for + * the directory and the name (and its length) of the new file. + */ +static int hfs_create(struct inode *dir, struct dentry *dentry, umode_t mode, + bool excl) +{ + struct inode *inode; + int res; + + inode = hfs_new_inode(dir, &dentry->d_name, mode); + if (!inode) + return -ENOMEM; + + res = hfs_cat_create(inode->i_ino, dir, &dentry->d_name, inode); + if (res) { + clear_nlink(inode); + hfs_delete_inode(inode); + iput(inode); + return res; + } + d_instantiate(dentry, inode); + mark_inode_dirty(inode); + return 0; +} + +/* + * hfs_mkdir() + * + * This is the mkdir() entry in the inode_operations structure for + * regular HFS directories. The purpose is to create a new directory + * in a directory, given the inode for the parent directory and the + * name (and its length) of the new directory. + */ +static int hfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) +{ + struct inode *inode; + int res; + + inode = hfs_new_inode(dir, &dentry->d_name, S_IFDIR | mode); + if (!inode) + return -ENOMEM; + + res = hfs_cat_create(inode->i_ino, dir, &dentry->d_name, inode); + if (res) { + clear_nlink(inode); + hfs_delete_inode(inode); + iput(inode); + return res; + } + d_instantiate(dentry, inode); + mark_inode_dirty(inode); + return 0; +} + +/* + * hfs_remove() + * + * This serves as both unlink() and rmdir() in the inode_operations + * structure for regular HFS directories. The purpose is to delete + * an existing child, given the inode for the parent directory and + * the name (and its length) of the existing directory. + * + * HFS does not have hardlinks, so both rmdir and unlink set the + * link count to 0. The only difference is the emptiness check. + */ +static int hfs_remove(struct inode *dir, struct dentry *dentry) +{ + struct inode *inode = d_inode(dentry); + int res; + + if (S_ISDIR(inode->i_mode) && inode->i_size != 2) + return -ENOTEMPTY; + res = hfs_cat_delete(inode->i_ino, dir, &dentry->d_name); + if (res) + return res; + clear_nlink(inode); + inode->i_ctime = CURRENT_TIME_SEC; + hfs_delete_inode(inode); + mark_inode_dirty(inode); + return 0; +} + +/* + * hfs_rename() + * + * This is the rename() entry in the inode_operations structure for + * regular HFS directories. The purpose is to rename an existing + * file or directory, given the inode for the current directory and + * the name (and its length) of the existing file/directory and the + * inode for the new directory and the name (and its length) of the + * new file/directory. + * XXX: how do you handle must_be dir? + */ +static int hfs_rename(struct inode *old_dir, struct dentry *old_dentry, + struct inode *new_dir, struct dentry *new_dentry) +{ + int res; + + /* Unlink destination if it already exists */ + if (d_really_is_positive(new_dentry)) { + res = hfs_remove(new_dir, new_dentry); + if (res) + return res; + } + + res = hfs_cat_move(d_inode(old_dentry)->i_ino, + old_dir, &old_dentry->d_name, + new_dir, &new_dentry->d_name); + if (!res) + hfs_cat_build_key(old_dir->i_sb, + (btree_key *)&HFS_I(d_inode(old_dentry))->cat_key, + new_dir->i_ino, &new_dentry->d_name); + return res; +} + +const struct file_operations hfs_dir_operations = { + .read = generic_read_dir, + .iterate = hfs_readdir, + .llseek = generic_file_llseek, + .release = hfs_dir_release, +}; + +const struct inode_operations hfs_dir_inode_operations = { + .create = hfs_create, + .lookup = hfs_lookup, + .unlink = hfs_remove, + .mkdir = hfs_mkdir, + .rmdir = hfs_remove, + .rename = hfs_rename, + .setattr = hfs_inode_setattr, +}; -- cgit 1.2.3-korg