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![Immad Mir](/assets/img/avatar_default.png)
[ Upstream commit 47cfdc338d
]
Syzkaller reported an issue where txBegin may be called
on a superblock in a read-only mounted filesystem which leads
to NULL pointer deref. This could be solved by checking if
the filesystem is read-only before calling txBegin, and returning
with appropiate error code.
Reported-By: syzbot+f1faa20eec55e0c8644c@syzkaller.appspotmail.com
Link: https://syzkaller.appspot.com/bug?id=be7e52c50c5182cc09a09ea6fc456446b2039de3
Signed-off-by: Immad Mir <mirimmad17@gmail.com>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
1613 lines
37 KiB
C
1613 lines
37 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) International Business Machines Corp., 2000-2004
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* Portions Copyright (C) Christoph Hellwig, 2001-2002
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*/
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#include <linux/fs.h>
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#include <linux/namei.h>
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#include <linux/ctype.h>
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#include <linux/quotaops.h>
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#include <linux/exportfs.h>
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#include "jfs_incore.h"
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#include "jfs_superblock.h"
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#include "jfs_inode.h"
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#include "jfs_dinode.h"
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#include "jfs_dmap.h"
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#include "jfs_unicode.h"
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#include "jfs_metapage.h"
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#include "jfs_xattr.h"
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#include "jfs_acl.h"
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#include "jfs_debug.h"
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/*
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* forward references
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*/
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const struct dentry_operations jfs_ci_dentry_operations;
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static s64 commitZeroLink(tid_t, struct inode *);
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/*
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* NAME: free_ea_wmap(inode)
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*
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* FUNCTION: free uncommitted extended attributes from working map
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*
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*/
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static inline void free_ea_wmap(struct inode *inode)
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{
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dxd_t *ea = &JFS_IP(inode)->ea;
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if (ea->flag & DXD_EXTENT) {
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/* free EA pages from cache */
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invalidate_dxd_metapages(inode, *ea);
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dbFree(inode, addressDXD(ea), lengthDXD(ea));
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}
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ea->flag = 0;
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}
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/*
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* NAME: jfs_create(dip, dentry, mode)
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*
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* FUNCTION: create a regular file in the parent directory <dip>
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* with name = <from dentry> and mode = <mode>
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*
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* PARAMETER: dip - parent directory vnode
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* dentry - dentry of new file
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* mode - create mode (rwxrwxrwx).
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* nd- nd struct
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*
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* RETURN: Errors from subroutines
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*
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*/
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static int jfs_create(struct mnt_idmap *idmap, struct inode *dip,
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struct dentry *dentry, umode_t mode, bool excl)
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{
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int rc = 0;
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tid_t tid; /* transaction id */
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struct inode *ip = NULL; /* child directory inode */
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ino_t ino;
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struct component_name dname; /* child directory name */
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struct btstack btstack;
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struct inode *iplist[2];
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struct tblock *tblk;
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jfs_info("jfs_create: dip:0x%p name:%pd", dip, dentry);
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rc = dquot_initialize(dip);
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if (rc)
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goto out1;
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/*
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* search parent directory for entry/freespace
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* (dtSearch() returns parent directory page pinned)
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*/
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if ((rc = get_UCSname(&dname, dentry)))
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goto out1;
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/*
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* Either iAlloc() or txBegin() may block. Deadlock can occur if we
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* block there while holding dtree page, so we allocate the inode &
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* begin the transaction before we search the directory.
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*/
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ip = ialloc(dip, mode);
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if (IS_ERR(ip)) {
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rc = PTR_ERR(ip);
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goto out2;
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}
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tid = txBegin(dip->i_sb, 0);
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mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
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mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
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rc = jfs_init_acl(tid, ip, dip);
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if (rc)
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goto out3;
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rc = jfs_init_security(tid, ip, dip, &dentry->d_name);
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if (rc) {
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txAbort(tid, 0);
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goto out3;
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}
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if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) {
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jfs_err("jfs_create: dtSearch returned %d", rc);
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txAbort(tid, 0);
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goto out3;
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}
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tblk = tid_to_tblock(tid);
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tblk->xflag |= COMMIT_CREATE;
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tblk->ino = ip->i_ino;
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tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
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iplist[0] = dip;
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iplist[1] = ip;
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/*
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* initialize the child XAD tree root in-line in inode
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*/
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xtInitRoot(tid, ip);
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/*
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* create entry in parent directory for child directory
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* (dtInsert() releases parent directory page)
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*/
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ino = ip->i_ino;
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if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) {
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if (rc == -EIO) {
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jfs_err("jfs_create: dtInsert returned -EIO");
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txAbort(tid, 1); /* Marks Filesystem dirty */
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} else
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txAbort(tid, 0); /* Filesystem full */
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goto out3;
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}
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ip->i_op = &jfs_file_inode_operations;
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ip->i_fop = &jfs_file_operations;
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ip->i_mapping->a_ops = &jfs_aops;
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mark_inode_dirty(ip);
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dip->i_ctime = dip->i_mtime = current_time(dip);
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mark_inode_dirty(dip);
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rc = txCommit(tid, 2, &iplist[0], 0);
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out3:
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txEnd(tid);
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mutex_unlock(&JFS_IP(ip)->commit_mutex);
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mutex_unlock(&JFS_IP(dip)->commit_mutex);
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if (rc) {
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free_ea_wmap(ip);
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clear_nlink(ip);
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discard_new_inode(ip);
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} else {
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d_instantiate_new(dentry, ip);
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}
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out2:
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free_UCSname(&dname);
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out1:
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jfs_info("jfs_create: rc:%d", rc);
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return rc;
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}
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/*
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* NAME: jfs_mkdir(dip, dentry, mode)
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*
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* FUNCTION: create a child directory in the parent directory <dip>
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* with name = <from dentry> and mode = <mode>
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*
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* PARAMETER: dip - parent directory vnode
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* dentry - dentry of child directory
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* mode - create mode (rwxrwxrwx).
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*
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* RETURN: Errors from subroutines
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*
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* note:
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* EACCES: user needs search+write permission on the parent directory
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*/
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static int jfs_mkdir(struct mnt_idmap *idmap, struct inode *dip,
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struct dentry *dentry, umode_t mode)
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{
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int rc = 0;
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tid_t tid; /* transaction id */
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struct inode *ip = NULL; /* child directory inode */
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ino_t ino;
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struct component_name dname; /* child directory name */
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struct btstack btstack;
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struct inode *iplist[2];
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struct tblock *tblk;
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jfs_info("jfs_mkdir: dip:0x%p name:%pd", dip, dentry);
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rc = dquot_initialize(dip);
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if (rc)
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goto out1;
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/*
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* search parent directory for entry/freespace
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* (dtSearch() returns parent directory page pinned)
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*/
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if ((rc = get_UCSname(&dname, dentry)))
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goto out1;
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/*
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* Either iAlloc() or txBegin() may block. Deadlock can occur if we
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* block there while holding dtree page, so we allocate the inode &
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* begin the transaction before we search the directory.
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*/
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ip = ialloc(dip, S_IFDIR | mode);
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if (IS_ERR(ip)) {
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rc = PTR_ERR(ip);
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goto out2;
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}
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tid = txBegin(dip->i_sb, 0);
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mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
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mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
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rc = jfs_init_acl(tid, ip, dip);
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if (rc)
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goto out3;
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rc = jfs_init_security(tid, ip, dip, &dentry->d_name);
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if (rc) {
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txAbort(tid, 0);
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goto out3;
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}
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if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) {
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jfs_err("jfs_mkdir: dtSearch returned %d", rc);
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txAbort(tid, 0);
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goto out3;
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}
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tblk = tid_to_tblock(tid);
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tblk->xflag |= COMMIT_CREATE;
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tblk->ino = ip->i_ino;
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tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
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iplist[0] = dip;
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iplist[1] = ip;
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/*
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* initialize the child directory in-line in inode
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*/
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dtInitRoot(tid, ip, dip->i_ino);
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/*
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* create entry in parent directory for child directory
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* (dtInsert() releases parent directory page)
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*/
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ino = ip->i_ino;
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if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) {
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if (rc == -EIO) {
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jfs_err("jfs_mkdir: dtInsert returned -EIO");
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txAbort(tid, 1); /* Marks Filesystem dirty */
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} else
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txAbort(tid, 0); /* Filesystem full */
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goto out3;
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}
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set_nlink(ip, 2); /* for '.' */
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ip->i_op = &jfs_dir_inode_operations;
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ip->i_fop = &jfs_dir_operations;
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mark_inode_dirty(ip);
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/* update parent directory inode */
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inc_nlink(dip); /* for '..' from child directory */
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dip->i_ctime = dip->i_mtime = current_time(dip);
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mark_inode_dirty(dip);
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rc = txCommit(tid, 2, &iplist[0], 0);
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out3:
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txEnd(tid);
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mutex_unlock(&JFS_IP(ip)->commit_mutex);
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mutex_unlock(&JFS_IP(dip)->commit_mutex);
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if (rc) {
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free_ea_wmap(ip);
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clear_nlink(ip);
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discard_new_inode(ip);
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} else {
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d_instantiate_new(dentry, ip);
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}
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out2:
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free_UCSname(&dname);
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out1:
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jfs_info("jfs_mkdir: rc:%d", rc);
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return rc;
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}
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/*
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* NAME: jfs_rmdir(dip, dentry)
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*
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* FUNCTION: remove a link to child directory
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*
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* PARAMETER: dip - parent inode
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* dentry - child directory dentry
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*
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* RETURN: -EINVAL - if name is . or ..
|
|
* -EINVAL - if . or .. exist but are invalid.
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|
* errors from subroutines
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*
|
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* note:
|
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* if other threads have the directory open when the last link
|
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* is removed, the "." and ".." entries, if present, are removed before
|
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* rmdir() returns and no new entries may be created in the directory,
|
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* but the directory is not removed until the last reference to
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* the directory is released (cf.unlink() of regular file).
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*/
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static int jfs_rmdir(struct inode *dip, struct dentry *dentry)
|
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{
|
|
int rc;
|
|
tid_t tid; /* transaction id */
|
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struct inode *ip = d_inode(dentry);
|
|
ino_t ino;
|
|
struct component_name dname;
|
|
struct inode *iplist[2];
|
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struct tblock *tblk;
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|
|
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jfs_info("jfs_rmdir: dip:0x%p name:%pd", dip, dentry);
|
|
|
|
/* Init inode for quota operations. */
|
|
rc = dquot_initialize(dip);
|
|
if (rc)
|
|
goto out;
|
|
rc = dquot_initialize(ip);
|
|
if (rc)
|
|
goto out;
|
|
|
|
/* directory must be empty to be removed */
|
|
if (!dtEmpty(ip)) {
|
|
rc = -ENOTEMPTY;
|
|
goto out;
|
|
}
|
|
|
|
if ((rc = get_UCSname(&dname, dentry))) {
|
|
goto out;
|
|
}
|
|
|
|
tid = txBegin(dip->i_sb, 0);
|
|
|
|
mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
|
|
mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
|
|
|
|
iplist[0] = dip;
|
|
iplist[1] = ip;
|
|
|
|
tblk = tid_to_tblock(tid);
|
|
tblk->xflag |= COMMIT_DELETE;
|
|
tblk->u.ip = ip;
|
|
|
|
/*
|
|
* delete the entry of target directory from parent directory
|
|
*/
|
|
ino = ip->i_ino;
|
|
if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) {
|
|
jfs_err("jfs_rmdir: dtDelete returned %d", rc);
|
|
if (rc == -EIO)
|
|
txAbort(tid, 1);
|
|
txEnd(tid);
|
|
mutex_unlock(&JFS_IP(ip)->commit_mutex);
|
|
mutex_unlock(&JFS_IP(dip)->commit_mutex);
|
|
|
|
goto out2;
|
|
}
|
|
|
|
/* update parent directory's link count corresponding
|
|
* to ".." entry of the target directory deleted
|
|
*/
|
|
dip->i_ctime = dip->i_mtime = current_time(dip);
|
|
inode_dec_link_count(dip);
|
|
|
|
/*
|
|
* OS/2 could have created EA and/or ACL
|
|
*/
|
|
/* free EA from both persistent and working map */
|
|
if (JFS_IP(ip)->ea.flag & DXD_EXTENT) {
|
|
/* free EA pages */
|
|
txEA(tid, ip, &JFS_IP(ip)->ea, NULL);
|
|
}
|
|
JFS_IP(ip)->ea.flag = 0;
|
|
|
|
/* free ACL from both persistent and working map */
|
|
if (JFS_IP(ip)->acl.flag & DXD_EXTENT) {
|
|
/* free ACL pages */
|
|
txEA(tid, ip, &JFS_IP(ip)->acl, NULL);
|
|
}
|
|
JFS_IP(ip)->acl.flag = 0;
|
|
|
|
/* mark the target directory as deleted */
|
|
clear_nlink(ip);
|
|
mark_inode_dirty(ip);
|
|
|
|
rc = txCommit(tid, 2, &iplist[0], 0);
|
|
|
|
txEnd(tid);
|
|
|
|
mutex_unlock(&JFS_IP(ip)->commit_mutex);
|
|
mutex_unlock(&JFS_IP(dip)->commit_mutex);
|
|
|
|
/*
|
|
* Truncating the directory index table is not guaranteed. It
|
|
* may need to be done iteratively
|
|
*/
|
|
if (test_cflag(COMMIT_Stale, dip)) {
|
|
if (dip->i_size > 1)
|
|
jfs_truncate_nolock(dip, 0);
|
|
|
|
clear_cflag(COMMIT_Stale, dip);
|
|
}
|
|
|
|
out2:
|
|
free_UCSname(&dname);
|
|
|
|
out:
|
|
jfs_info("jfs_rmdir: rc:%d", rc);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* NAME: jfs_unlink(dip, dentry)
|
|
*
|
|
* FUNCTION: remove a link to object <vp> named by <name>
|
|
* from parent directory <dvp>
|
|
*
|
|
* PARAMETER: dip - inode of parent directory
|
|
* dentry - dentry of object to be removed
|
|
*
|
|
* RETURN: errors from subroutines
|
|
*
|
|
* note:
|
|
* temporary file: if one or more processes have the file open
|
|
* when the last link is removed, the link will be removed before
|
|
* unlink() returns, but the removal of the file contents will be
|
|
* postponed until all references to the files are closed.
|
|
*
|
|
* JFS does NOT support unlink() on directories.
|
|
*
|
|
*/
|
|
static int jfs_unlink(struct inode *dip, struct dentry *dentry)
|
|
{
|
|
int rc;
|
|
tid_t tid; /* transaction id */
|
|
struct inode *ip = d_inode(dentry);
|
|
ino_t ino;
|
|
struct component_name dname; /* object name */
|
|
struct inode *iplist[2];
|
|
struct tblock *tblk;
|
|
s64 new_size = 0;
|
|
int commit_flag;
|
|
|
|
jfs_info("jfs_unlink: dip:0x%p name:%pd", dip, dentry);
|
|
|
|
/* Init inode for quota operations. */
|
|
rc = dquot_initialize(dip);
|
|
if (rc)
|
|
goto out;
|
|
rc = dquot_initialize(ip);
|
|
if (rc)
|
|
goto out;
|
|
|
|
if ((rc = get_UCSname(&dname, dentry)))
|
|
goto out;
|
|
|
|
IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
|
|
|
|
tid = txBegin(dip->i_sb, 0);
|
|
|
|
mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
|
|
mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
|
|
|
|
iplist[0] = dip;
|
|
iplist[1] = ip;
|
|
|
|
/*
|
|
* delete the entry of target file from parent directory
|
|
*/
|
|
ino = ip->i_ino;
|
|
if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) {
|
|
jfs_err("jfs_unlink: dtDelete returned %d", rc);
|
|
if (rc == -EIO)
|
|
txAbort(tid, 1); /* Marks FS Dirty */
|
|
txEnd(tid);
|
|
mutex_unlock(&JFS_IP(ip)->commit_mutex);
|
|
mutex_unlock(&JFS_IP(dip)->commit_mutex);
|
|
IWRITE_UNLOCK(ip);
|
|
goto out1;
|
|
}
|
|
|
|
ASSERT(ip->i_nlink);
|
|
|
|
ip->i_ctime = dip->i_ctime = dip->i_mtime = current_time(ip);
|
|
mark_inode_dirty(dip);
|
|
|
|
/* update target's inode */
|
|
inode_dec_link_count(ip);
|
|
|
|
/*
|
|
* commit zero link count object
|
|
*/
|
|
if (ip->i_nlink == 0) {
|
|
assert(!test_cflag(COMMIT_Nolink, ip));
|
|
/* free block resources */
|
|
if ((new_size = commitZeroLink(tid, ip)) < 0) {
|
|
txAbort(tid, 1); /* Marks FS Dirty */
|
|
txEnd(tid);
|
|
mutex_unlock(&JFS_IP(ip)->commit_mutex);
|
|
mutex_unlock(&JFS_IP(dip)->commit_mutex);
|
|
IWRITE_UNLOCK(ip);
|
|
rc = new_size;
|
|
goto out1;
|
|
}
|
|
tblk = tid_to_tblock(tid);
|
|
tblk->xflag |= COMMIT_DELETE;
|
|
tblk->u.ip = ip;
|
|
}
|
|
|
|
/*
|
|
* Incomplete truncate of file data can
|
|
* result in timing problems unless we synchronously commit the
|
|
* transaction.
|
|
*/
|
|
if (new_size)
|
|
commit_flag = COMMIT_SYNC;
|
|
else
|
|
commit_flag = 0;
|
|
|
|
/*
|
|
* If xtTruncate was incomplete, commit synchronously to avoid
|
|
* timing complications
|
|
*/
|
|
rc = txCommit(tid, 2, &iplist[0], commit_flag);
|
|
|
|
txEnd(tid);
|
|
|
|
mutex_unlock(&JFS_IP(ip)->commit_mutex);
|
|
mutex_unlock(&JFS_IP(dip)->commit_mutex);
|
|
|
|
while (new_size && (rc == 0)) {
|
|
tid = txBegin(dip->i_sb, 0);
|
|
mutex_lock(&JFS_IP(ip)->commit_mutex);
|
|
new_size = xtTruncate_pmap(tid, ip, new_size);
|
|
if (new_size < 0) {
|
|
txAbort(tid, 1); /* Marks FS Dirty */
|
|
rc = new_size;
|
|
} else
|
|
rc = txCommit(tid, 2, &iplist[0], COMMIT_SYNC);
|
|
txEnd(tid);
|
|
mutex_unlock(&JFS_IP(ip)->commit_mutex);
|
|
}
|
|
|
|
if (ip->i_nlink == 0)
|
|
set_cflag(COMMIT_Nolink, ip);
|
|
|
|
IWRITE_UNLOCK(ip);
|
|
|
|
/*
|
|
* Truncating the directory index table is not guaranteed. It
|
|
* may need to be done iteratively
|
|
*/
|
|
if (test_cflag(COMMIT_Stale, dip)) {
|
|
if (dip->i_size > 1)
|
|
jfs_truncate_nolock(dip, 0);
|
|
|
|
clear_cflag(COMMIT_Stale, dip);
|
|
}
|
|
|
|
out1:
|
|
free_UCSname(&dname);
|
|
out:
|
|
jfs_info("jfs_unlink: rc:%d", rc);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* NAME: commitZeroLink()
|
|
*
|
|
* FUNCTION: for non-directory, called by jfs_remove(),
|
|
* truncate a regular file, directory or symbolic
|
|
* link to zero length. return 0 if type is not
|
|
* one of these.
|
|
*
|
|
* if the file is currently associated with a VM segment
|
|
* only permanent disk and inode map resources are freed,
|
|
* and neither the inode nor indirect blocks are modified
|
|
* so that the resources can be later freed in the work
|
|
* map by ctrunc1.
|
|
* if there is no VM segment on entry, the resources are
|
|
* freed in both work and permanent map.
|
|
* (? for temporary file - memory object is cached even
|
|
* after no reference:
|
|
* reference count > 0 - )
|
|
*
|
|
* PARAMETERS: cd - pointer to commit data structure.
|
|
* current inode is the one to truncate.
|
|
*
|
|
* RETURN: Errors from subroutines
|
|
*/
|
|
static s64 commitZeroLink(tid_t tid, struct inode *ip)
|
|
{
|
|
int filetype;
|
|
struct tblock *tblk;
|
|
|
|
jfs_info("commitZeroLink: tid = %d, ip = 0x%p", tid, ip);
|
|
|
|
filetype = ip->i_mode & S_IFMT;
|
|
switch (filetype) {
|
|
case S_IFREG:
|
|
break;
|
|
case S_IFLNK:
|
|
/* fast symbolic link */
|
|
if (ip->i_size < IDATASIZE) {
|
|
ip->i_size = 0;
|
|
return 0;
|
|
}
|
|
break;
|
|
default:
|
|
assert(filetype != S_IFDIR);
|
|
return 0;
|
|
}
|
|
|
|
set_cflag(COMMIT_Freewmap, ip);
|
|
|
|
/* mark transaction of block map update type */
|
|
tblk = tid_to_tblock(tid);
|
|
tblk->xflag |= COMMIT_PMAP;
|
|
|
|
/*
|
|
* free EA
|
|
*/
|
|
if (JFS_IP(ip)->ea.flag & DXD_EXTENT)
|
|
/* acquire maplock on EA to be freed from block map */
|
|
txEA(tid, ip, &JFS_IP(ip)->ea, NULL);
|
|
|
|
/*
|
|
* free ACL
|
|
*/
|
|
if (JFS_IP(ip)->acl.flag & DXD_EXTENT)
|
|
/* acquire maplock on EA to be freed from block map */
|
|
txEA(tid, ip, &JFS_IP(ip)->acl, NULL);
|
|
|
|
/*
|
|
* free xtree/data (truncate to zero length):
|
|
* free xtree/data pages from cache if COMMIT_PWMAP,
|
|
* free xtree/data blocks from persistent block map, and
|
|
* free xtree/data blocks from working block map if COMMIT_PWMAP;
|
|
*/
|
|
if (ip->i_size)
|
|
return xtTruncate_pmap(tid, ip, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* NAME: jfs_free_zero_link()
|
|
*
|
|
* FUNCTION: for non-directory, called by iClose(),
|
|
* free resources of a file from cache and WORKING map
|
|
* for a file previously committed with zero link count
|
|
* while associated with a pager object,
|
|
*
|
|
* PARAMETER: ip - pointer to inode of file.
|
|
*/
|
|
void jfs_free_zero_link(struct inode *ip)
|
|
{
|
|
int type;
|
|
|
|
jfs_info("jfs_free_zero_link: ip = 0x%p", ip);
|
|
|
|
/* return if not reg or symbolic link or if size is
|
|
* already ok.
|
|
*/
|
|
type = ip->i_mode & S_IFMT;
|
|
|
|
switch (type) {
|
|
case S_IFREG:
|
|
break;
|
|
case S_IFLNK:
|
|
/* if its contained in inode nothing to do */
|
|
if (ip->i_size < IDATASIZE)
|
|
return;
|
|
break;
|
|
default:
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* free EA
|
|
*/
|
|
if (JFS_IP(ip)->ea.flag & DXD_EXTENT) {
|
|
s64 xaddr = addressDXD(&JFS_IP(ip)->ea);
|
|
int xlen = lengthDXD(&JFS_IP(ip)->ea);
|
|
struct maplock maplock; /* maplock for COMMIT_WMAP */
|
|
struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */
|
|
|
|
/* free EA pages from cache */
|
|
invalidate_dxd_metapages(ip, JFS_IP(ip)->ea);
|
|
|
|
/* free EA extent from working block map */
|
|
maplock.index = 1;
|
|
pxdlock = (struct pxd_lock *) & maplock;
|
|
pxdlock->flag = mlckFREEPXD;
|
|
PXDaddress(&pxdlock->pxd, xaddr);
|
|
PXDlength(&pxdlock->pxd, xlen);
|
|
txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP);
|
|
}
|
|
|
|
/*
|
|
* free ACL
|
|
*/
|
|
if (JFS_IP(ip)->acl.flag & DXD_EXTENT) {
|
|
s64 xaddr = addressDXD(&JFS_IP(ip)->acl);
|
|
int xlen = lengthDXD(&JFS_IP(ip)->acl);
|
|
struct maplock maplock; /* maplock for COMMIT_WMAP */
|
|
struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */
|
|
|
|
invalidate_dxd_metapages(ip, JFS_IP(ip)->acl);
|
|
|
|
/* free ACL extent from working block map */
|
|
maplock.index = 1;
|
|
pxdlock = (struct pxd_lock *) & maplock;
|
|
pxdlock->flag = mlckFREEPXD;
|
|
PXDaddress(&pxdlock->pxd, xaddr);
|
|
PXDlength(&pxdlock->pxd, xlen);
|
|
txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP);
|
|
}
|
|
|
|
/*
|
|
* free xtree/data (truncate to zero length):
|
|
* free xtree/data pages from cache, and
|
|
* free xtree/data blocks from working block map;
|
|
*/
|
|
if (ip->i_size)
|
|
xtTruncate(0, ip, 0, COMMIT_WMAP);
|
|
}
|
|
|
|
/*
|
|
* NAME: jfs_link(vp, dvp, name, crp)
|
|
*
|
|
* FUNCTION: create a link to <vp> by the name = <name>
|
|
* in the parent directory <dvp>
|
|
*
|
|
* PARAMETER: vp - target object
|
|
* dvp - parent directory of new link
|
|
* name - name of new link to target object
|
|
* crp - credential
|
|
*
|
|
* RETURN: Errors from subroutines
|
|
*
|
|
* note:
|
|
* JFS does NOT support link() on directories (to prevent circular
|
|
* path in the directory hierarchy);
|
|
* EPERM: the target object is a directory, and either the caller
|
|
* does not have appropriate privileges or the implementation prohibits
|
|
* using link() on directories [XPG4.2].
|
|
*
|
|
* JFS does NOT support links between file systems:
|
|
* EXDEV: target object and new link are on different file systems and
|
|
* implementation does not support links between file systems [XPG4.2].
|
|
*/
|
|
static int jfs_link(struct dentry *old_dentry,
|
|
struct inode *dir, struct dentry *dentry)
|
|
{
|
|
int rc;
|
|
tid_t tid;
|
|
struct inode *ip = d_inode(old_dentry);
|
|
ino_t ino;
|
|
struct component_name dname;
|
|
struct btstack btstack;
|
|
struct inode *iplist[2];
|
|
|
|
jfs_info("jfs_link: %pd %pd", old_dentry, dentry);
|
|
|
|
rc = dquot_initialize(dir);
|
|
if (rc)
|
|
goto out;
|
|
|
|
if (isReadOnly(ip)) {
|
|
jfs_error(ip->i_sb, "read-only filesystem\n");
|
|
return -EROFS;
|
|
}
|
|
|
|
tid = txBegin(ip->i_sb, 0);
|
|
|
|
mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT);
|
|
mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
|
|
|
|
/*
|
|
* scan parent directory for entry/freespace
|
|
*/
|
|
if ((rc = get_UCSname(&dname, dentry)))
|
|
goto out_tx;
|
|
|
|
if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE)))
|
|
goto free_dname;
|
|
|
|
/*
|
|
* create entry for new link in parent directory
|
|
*/
|
|
ino = ip->i_ino;
|
|
if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack)))
|
|
goto free_dname;
|
|
|
|
/* update object inode */
|
|
inc_nlink(ip); /* for new link */
|
|
ip->i_ctime = current_time(ip);
|
|
dir->i_ctime = dir->i_mtime = current_time(dir);
|
|
mark_inode_dirty(dir);
|
|
ihold(ip);
|
|
|
|
iplist[0] = ip;
|
|
iplist[1] = dir;
|
|
rc = txCommit(tid, 2, &iplist[0], 0);
|
|
|
|
if (rc) {
|
|
drop_nlink(ip); /* never instantiated */
|
|
iput(ip);
|
|
} else
|
|
d_instantiate(dentry, ip);
|
|
|
|
free_dname:
|
|
free_UCSname(&dname);
|
|
|
|
out_tx:
|
|
txEnd(tid);
|
|
|
|
mutex_unlock(&JFS_IP(ip)->commit_mutex);
|
|
mutex_unlock(&JFS_IP(dir)->commit_mutex);
|
|
|
|
out:
|
|
jfs_info("jfs_link: rc:%d", rc);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* NAME: jfs_symlink(dip, dentry, name)
|
|
*
|
|
* FUNCTION: creates a symbolic link to <symlink> by name <name>
|
|
* in directory <dip>
|
|
*
|
|
* PARAMETER: dip - parent directory vnode
|
|
* dentry - dentry of symbolic link
|
|
* name - the path name of the existing object
|
|
* that will be the source of the link
|
|
*
|
|
* RETURN: errors from subroutines
|
|
*
|
|
* note:
|
|
* ENAMETOOLONG: pathname resolution of a symbolic link produced
|
|
* an intermediate result whose length exceeds PATH_MAX [XPG4.2]
|
|
*/
|
|
|
|
static int jfs_symlink(struct mnt_idmap *idmap, struct inode *dip,
|
|
struct dentry *dentry, const char *name)
|
|
{
|
|
int rc;
|
|
tid_t tid;
|
|
ino_t ino = 0;
|
|
struct component_name dname;
|
|
int ssize; /* source pathname size */
|
|
struct btstack btstack;
|
|
struct inode *ip = d_inode(dentry);
|
|
s64 xlen = 0;
|
|
int bmask = 0, xsize;
|
|
s64 xaddr;
|
|
struct metapage *mp;
|
|
struct super_block *sb;
|
|
struct tblock *tblk;
|
|
|
|
struct inode *iplist[2];
|
|
|
|
jfs_info("jfs_symlink: dip:0x%p name:%s", dip, name);
|
|
|
|
rc = dquot_initialize(dip);
|
|
if (rc)
|
|
goto out1;
|
|
|
|
ssize = strlen(name) + 1;
|
|
|
|
/*
|
|
* search parent directory for entry/freespace
|
|
* (dtSearch() returns parent directory page pinned)
|
|
*/
|
|
|
|
if ((rc = get_UCSname(&dname, dentry)))
|
|
goto out1;
|
|
|
|
/*
|
|
* allocate on-disk/in-memory inode for symbolic link:
|
|
* (iAlloc() returns new, locked inode)
|
|
*/
|
|
ip = ialloc(dip, S_IFLNK | 0777);
|
|
if (IS_ERR(ip)) {
|
|
rc = PTR_ERR(ip);
|
|
goto out2;
|
|
}
|
|
|
|
tid = txBegin(dip->i_sb, 0);
|
|
|
|
mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
|
|
mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
|
|
|
|
rc = jfs_init_security(tid, ip, dip, &dentry->d_name);
|
|
if (rc)
|
|
goto out3;
|
|
|
|
tblk = tid_to_tblock(tid);
|
|
tblk->xflag |= COMMIT_CREATE;
|
|
tblk->ino = ip->i_ino;
|
|
tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
|
|
|
|
/* fix symlink access permission
|
|
* (dir_create() ANDs in the u.u_cmask,
|
|
* but symlinks really need to be 777 access)
|
|
*/
|
|
ip->i_mode |= 0777;
|
|
|
|
/*
|
|
* write symbolic link target path name
|
|
*/
|
|
xtInitRoot(tid, ip);
|
|
|
|
/*
|
|
* write source path name inline in on-disk inode (fast symbolic link)
|
|
*/
|
|
|
|
if (ssize <= IDATASIZE) {
|
|
ip->i_op = &jfs_fast_symlink_inode_operations;
|
|
|
|
ip->i_link = JFS_IP(ip)->i_inline_all;
|
|
memcpy(ip->i_link, name, ssize);
|
|
ip->i_size = ssize - 1;
|
|
|
|
/*
|
|
* if symlink is > 128 bytes, we don't have the space to
|
|
* store inline extended attributes
|
|
*/
|
|
if (ssize > sizeof (JFS_IP(ip)->i_inline))
|
|
JFS_IP(ip)->mode2 &= ~INLINEEA;
|
|
|
|
jfs_info("jfs_symlink: fast symlink added ssize:%d name:%s ",
|
|
ssize, name);
|
|
}
|
|
/*
|
|
* write source path name in a single extent
|
|
*/
|
|
else {
|
|
jfs_info("jfs_symlink: allocate extent ip:0x%p", ip);
|
|
|
|
ip->i_op = &jfs_symlink_inode_operations;
|
|
inode_nohighmem(ip);
|
|
ip->i_mapping->a_ops = &jfs_aops;
|
|
|
|
/*
|
|
* even though the data of symlink object (source
|
|
* path name) is treated as non-journaled user data,
|
|
* it is read/written thru buffer cache for performance.
|
|
*/
|
|
sb = ip->i_sb;
|
|
bmask = JFS_SBI(sb)->bsize - 1;
|
|
xsize = (ssize + bmask) & ~bmask;
|
|
xaddr = 0;
|
|
xlen = xsize >> JFS_SBI(sb)->l2bsize;
|
|
if ((rc = xtInsert(tid, ip, 0, 0, xlen, &xaddr, 0))) {
|
|
txAbort(tid, 0);
|
|
goto out3;
|
|
}
|
|
ip->i_size = ssize - 1;
|
|
while (ssize) {
|
|
/* This is kind of silly since PATH_MAX == 4K */
|
|
int copy_size = min(ssize, PSIZE);
|
|
|
|
mp = get_metapage(ip, xaddr, PSIZE, 1);
|
|
|
|
if (mp == NULL) {
|
|
xtTruncate(tid, ip, 0, COMMIT_PWMAP);
|
|
rc = -EIO;
|
|
txAbort(tid, 0);
|
|
goto out3;
|
|
}
|
|
memcpy(mp->data, name, copy_size);
|
|
flush_metapage(mp);
|
|
ssize -= copy_size;
|
|
name += copy_size;
|
|
xaddr += JFS_SBI(sb)->nbperpage;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* create entry for symbolic link in parent directory
|
|
*/
|
|
rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE);
|
|
if (rc == 0) {
|
|
ino = ip->i_ino;
|
|
rc = dtInsert(tid, dip, &dname, &ino, &btstack);
|
|
}
|
|
if (rc) {
|
|
if (xlen)
|
|
xtTruncate(tid, ip, 0, COMMIT_PWMAP);
|
|
txAbort(tid, 0);
|
|
/* discard new inode */
|
|
goto out3;
|
|
}
|
|
|
|
mark_inode_dirty(ip);
|
|
|
|
dip->i_ctime = dip->i_mtime = current_time(dip);
|
|
mark_inode_dirty(dip);
|
|
/*
|
|
* commit update of parent directory and link object
|
|
*/
|
|
|
|
iplist[0] = dip;
|
|
iplist[1] = ip;
|
|
rc = txCommit(tid, 2, &iplist[0], 0);
|
|
|
|
out3:
|
|
txEnd(tid);
|
|
mutex_unlock(&JFS_IP(ip)->commit_mutex);
|
|
mutex_unlock(&JFS_IP(dip)->commit_mutex);
|
|
if (rc) {
|
|
free_ea_wmap(ip);
|
|
clear_nlink(ip);
|
|
discard_new_inode(ip);
|
|
} else {
|
|
d_instantiate_new(dentry, ip);
|
|
}
|
|
|
|
out2:
|
|
free_UCSname(&dname);
|
|
|
|
out1:
|
|
jfs_info("jfs_symlink: rc:%d", rc);
|
|
return rc;
|
|
}
|
|
|
|
|
|
/*
|
|
* NAME: jfs_rename
|
|
*
|
|
* FUNCTION: rename a file or directory
|
|
*/
|
|
static int jfs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
|
|
struct dentry *old_dentry, struct inode *new_dir,
|
|
struct dentry *new_dentry, unsigned int flags)
|
|
{
|
|
struct btstack btstack;
|
|
ino_t ino;
|
|
struct component_name new_dname;
|
|
struct inode *new_ip;
|
|
struct component_name old_dname;
|
|
struct inode *old_ip;
|
|
int rc;
|
|
tid_t tid;
|
|
struct tlock *tlck;
|
|
struct dt_lock *dtlck;
|
|
struct lv *lv;
|
|
int ipcount;
|
|
struct inode *iplist[4];
|
|
struct tblock *tblk;
|
|
s64 new_size = 0;
|
|
int commit_flag;
|
|
|
|
if (flags & ~RENAME_NOREPLACE)
|
|
return -EINVAL;
|
|
|
|
jfs_info("jfs_rename: %pd %pd", old_dentry, new_dentry);
|
|
|
|
rc = dquot_initialize(old_dir);
|
|
if (rc)
|
|
goto out1;
|
|
rc = dquot_initialize(new_dir);
|
|
if (rc)
|
|
goto out1;
|
|
|
|
old_ip = d_inode(old_dentry);
|
|
new_ip = d_inode(new_dentry);
|
|
|
|
if ((rc = get_UCSname(&old_dname, old_dentry)))
|
|
goto out1;
|
|
|
|
if ((rc = get_UCSname(&new_dname, new_dentry)))
|
|
goto out2;
|
|
|
|
/*
|
|
* Make sure source inode number is what we think it is
|
|
*/
|
|
rc = dtSearch(old_dir, &old_dname, &ino, &btstack, JFS_LOOKUP);
|
|
if (rc || (ino != old_ip->i_ino)) {
|
|
rc = -ENOENT;
|
|
goto out3;
|
|
}
|
|
|
|
/*
|
|
* Make sure dest inode number (if any) is what we think it is
|
|
*/
|
|
rc = dtSearch(new_dir, &new_dname, &ino, &btstack, JFS_LOOKUP);
|
|
if (!rc) {
|
|
if ((!new_ip) || (ino != new_ip->i_ino)) {
|
|
rc = -ESTALE;
|
|
goto out3;
|
|
}
|
|
} else if (rc != -ENOENT)
|
|
goto out3;
|
|
else if (new_ip) {
|
|
/* no entry exists, but one was expected */
|
|
rc = -ESTALE;
|
|
goto out3;
|
|
}
|
|
|
|
if (S_ISDIR(old_ip->i_mode)) {
|
|
if (new_ip) {
|
|
if (!dtEmpty(new_ip)) {
|
|
rc = -ENOTEMPTY;
|
|
goto out3;
|
|
}
|
|
}
|
|
} else if (new_ip) {
|
|
IWRITE_LOCK(new_ip, RDWRLOCK_NORMAL);
|
|
/* Init inode for quota operations. */
|
|
rc = dquot_initialize(new_ip);
|
|
if (rc)
|
|
goto out_unlock;
|
|
}
|
|
|
|
/*
|
|
* The real work starts here
|
|
*/
|
|
tid = txBegin(new_dir->i_sb, 0);
|
|
|
|
/*
|
|
* How do we know the locking is safe from deadlocks?
|
|
* The vfs does the hard part for us. Any time we are taking nested
|
|
* commit_mutexes, the vfs already has i_mutex held on the parent.
|
|
* Here, the vfs has already taken i_mutex on both old_dir and new_dir.
|
|
*/
|
|
mutex_lock_nested(&JFS_IP(new_dir)->commit_mutex, COMMIT_MUTEX_PARENT);
|
|
mutex_lock_nested(&JFS_IP(old_ip)->commit_mutex, COMMIT_MUTEX_CHILD);
|
|
if (old_dir != new_dir)
|
|
mutex_lock_nested(&JFS_IP(old_dir)->commit_mutex,
|
|
COMMIT_MUTEX_SECOND_PARENT);
|
|
|
|
if (new_ip) {
|
|
mutex_lock_nested(&JFS_IP(new_ip)->commit_mutex,
|
|
COMMIT_MUTEX_VICTIM);
|
|
/*
|
|
* Change existing directory entry to new inode number
|
|
*/
|
|
ino = new_ip->i_ino;
|
|
rc = dtModify(tid, new_dir, &new_dname, &ino,
|
|
old_ip->i_ino, JFS_RENAME);
|
|
if (rc)
|
|
goto out_tx;
|
|
drop_nlink(new_ip);
|
|
if (S_ISDIR(new_ip->i_mode)) {
|
|
drop_nlink(new_ip);
|
|
if (new_ip->i_nlink) {
|
|
mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
|
|
if (old_dir != new_dir)
|
|
mutex_unlock(&JFS_IP(old_dir)->commit_mutex);
|
|
mutex_unlock(&JFS_IP(old_ip)->commit_mutex);
|
|
mutex_unlock(&JFS_IP(new_dir)->commit_mutex);
|
|
if (!S_ISDIR(old_ip->i_mode) && new_ip)
|
|
IWRITE_UNLOCK(new_ip);
|
|
jfs_error(new_ip->i_sb,
|
|
"new_ip->i_nlink != 0\n");
|
|
return -EIO;
|
|
}
|
|
tblk = tid_to_tblock(tid);
|
|
tblk->xflag |= COMMIT_DELETE;
|
|
tblk->u.ip = new_ip;
|
|
} else if (new_ip->i_nlink == 0) {
|
|
assert(!test_cflag(COMMIT_Nolink, new_ip));
|
|
/* free block resources */
|
|
if ((new_size = commitZeroLink(tid, new_ip)) < 0) {
|
|
txAbort(tid, 1); /* Marks FS Dirty */
|
|
rc = new_size;
|
|
goto out_tx;
|
|
}
|
|
tblk = tid_to_tblock(tid);
|
|
tblk->xflag |= COMMIT_DELETE;
|
|
tblk->u.ip = new_ip;
|
|
} else {
|
|
new_ip->i_ctime = current_time(new_ip);
|
|
mark_inode_dirty(new_ip);
|
|
}
|
|
} else {
|
|
/*
|
|
* Add new directory entry
|
|
*/
|
|
rc = dtSearch(new_dir, &new_dname, &ino, &btstack,
|
|
JFS_CREATE);
|
|
if (rc) {
|
|
jfs_err("jfs_rename didn't expect dtSearch to fail w/rc = %d",
|
|
rc);
|
|
goto out_tx;
|
|
}
|
|
|
|
ino = old_ip->i_ino;
|
|
rc = dtInsert(tid, new_dir, &new_dname, &ino, &btstack);
|
|
if (rc) {
|
|
if (rc == -EIO)
|
|
jfs_err("jfs_rename: dtInsert returned -EIO");
|
|
goto out_tx;
|
|
}
|
|
if (S_ISDIR(old_ip->i_mode))
|
|
inc_nlink(new_dir);
|
|
}
|
|
/*
|
|
* Remove old directory entry
|
|
*/
|
|
|
|
ino = old_ip->i_ino;
|
|
rc = dtDelete(tid, old_dir, &old_dname, &ino, JFS_REMOVE);
|
|
if (rc) {
|
|
jfs_err("jfs_rename did not expect dtDelete to return rc = %d",
|
|
rc);
|
|
txAbort(tid, 1); /* Marks Filesystem dirty */
|
|
goto out_tx;
|
|
}
|
|
if (S_ISDIR(old_ip->i_mode)) {
|
|
drop_nlink(old_dir);
|
|
if (old_dir != new_dir) {
|
|
/*
|
|
* Change inode number of parent for moved directory
|
|
*/
|
|
|
|
JFS_IP(old_ip)->i_dtroot.header.idotdot =
|
|
cpu_to_le32(new_dir->i_ino);
|
|
|
|
/* Linelock header of dtree */
|
|
tlck = txLock(tid, old_ip,
|
|
(struct metapage *) &JFS_IP(old_ip)->bxflag,
|
|
tlckDTREE | tlckBTROOT | tlckRELINK);
|
|
dtlck = (struct dt_lock *) & tlck->lock;
|
|
ASSERT(dtlck->index == 0);
|
|
lv = & dtlck->lv[0];
|
|
lv->offset = 0;
|
|
lv->length = 1;
|
|
dtlck->index++;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Update ctime on changed/moved inodes & mark dirty
|
|
*/
|
|
old_ip->i_ctime = current_time(old_ip);
|
|
mark_inode_dirty(old_ip);
|
|
|
|
new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir);
|
|
mark_inode_dirty(new_dir);
|
|
|
|
/* Build list of inodes modified by this transaction */
|
|
ipcount = 0;
|
|
iplist[ipcount++] = old_ip;
|
|
if (new_ip)
|
|
iplist[ipcount++] = new_ip;
|
|
iplist[ipcount++] = old_dir;
|
|
|
|
if (old_dir != new_dir) {
|
|
iplist[ipcount++] = new_dir;
|
|
old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
|
|
mark_inode_dirty(old_dir);
|
|
}
|
|
|
|
/*
|
|
* Incomplete truncate of file data can
|
|
* result in timing problems unless we synchronously commit the
|
|
* transaction.
|
|
*/
|
|
if (new_size)
|
|
commit_flag = COMMIT_SYNC;
|
|
else
|
|
commit_flag = 0;
|
|
|
|
rc = txCommit(tid, ipcount, iplist, commit_flag);
|
|
|
|
out_tx:
|
|
txEnd(tid);
|
|
if (new_ip)
|
|
mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
|
|
if (old_dir != new_dir)
|
|
mutex_unlock(&JFS_IP(old_dir)->commit_mutex);
|
|
mutex_unlock(&JFS_IP(old_ip)->commit_mutex);
|
|
mutex_unlock(&JFS_IP(new_dir)->commit_mutex);
|
|
|
|
while (new_size && (rc == 0)) {
|
|
tid = txBegin(new_ip->i_sb, 0);
|
|
mutex_lock(&JFS_IP(new_ip)->commit_mutex);
|
|
new_size = xtTruncate_pmap(tid, new_ip, new_size);
|
|
if (new_size < 0) {
|
|
txAbort(tid, 1);
|
|
rc = new_size;
|
|
} else
|
|
rc = txCommit(tid, 1, &new_ip, COMMIT_SYNC);
|
|
txEnd(tid);
|
|
mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
|
|
}
|
|
if (new_ip && (new_ip->i_nlink == 0))
|
|
set_cflag(COMMIT_Nolink, new_ip);
|
|
/*
|
|
* Truncating the directory index table is not guaranteed. It
|
|
* may need to be done iteratively
|
|
*/
|
|
if (test_cflag(COMMIT_Stale, old_dir)) {
|
|
if (old_dir->i_size > 1)
|
|
jfs_truncate_nolock(old_dir, 0);
|
|
|
|
clear_cflag(COMMIT_Stale, old_dir);
|
|
}
|
|
out_unlock:
|
|
if (new_ip && !S_ISDIR(new_ip->i_mode))
|
|
IWRITE_UNLOCK(new_ip);
|
|
out3:
|
|
free_UCSname(&new_dname);
|
|
out2:
|
|
free_UCSname(&old_dname);
|
|
out1:
|
|
jfs_info("jfs_rename: returning %d", rc);
|
|
return rc;
|
|
}
|
|
|
|
|
|
/*
|
|
* NAME: jfs_mknod
|
|
*
|
|
* FUNCTION: Create a special file (device)
|
|
*/
|
|
static int jfs_mknod(struct mnt_idmap *idmap, struct inode *dir,
|
|
struct dentry *dentry, umode_t mode, dev_t rdev)
|
|
{
|
|
struct jfs_inode_info *jfs_ip;
|
|
struct btstack btstack;
|
|
struct component_name dname;
|
|
ino_t ino;
|
|
struct inode *ip;
|
|
struct inode *iplist[2];
|
|
int rc;
|
|
tid_t tid;
|
|
struct tblock *tblk;
|
|
|
|
jfs_info("jfs_mknod: %pd", dentry);
|
|
|
|
rc = dquot_initialize(dir);
|
|
if (rc)
|
|
goto out;
|
|
|
|
if ((rc = get_UCSname(&dname, dentry)))
|
|
goto out;
|
|
|
|
ip = ialloc(dir, mode);
|
|
if (IS_ERR(ip)) {
|
|
rc = PTR_ERR(ip);
|
|
goto out1;
|
|
}
|
|
jfs_ip = JFS_IP(ip);
|
|
|
|
tid = txBegin(dir->i_sb, 0);
|
|
|
|
mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT);
|
|
mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
|
|
|
|
rc = jfs_init_acl(tid, ip, dir);
|
|
if (rc)
|
|
goto out3;
|
|
|
|
rc = jfs_init_security(tid, ip, dir, &dentry->d_name);
|
|
if (rc) {
|
|
txAbort(tid, 0);
|
|
goto out3;
|
|
}
|
|
|
|
if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE))) {
|
|
txAbort(tid, 0);
|
|
goto out3;
|
|
}
|
|
|
|
tblk = tid_to_tblock(tid);
|
|
tblk->xflag |= COMMIT_CREATE;
|
|
tblk->ino = ip->i_ino;
|
|
tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
|
|
|
|
ino = ip->i_ino;
|
|
if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack))) {
|
|
txAbort(tid, 0);
|
|
goto out3;
|
|
}
|
|
|
|
ip->i_op = &jfs_file_inode_operations;
|
|
jfs_ip->dev = new_encode_dev(rdev);
|
|
init_special_inode(ip, ip->i_mode, rdev);
|
|
|
|
mark_inode_dirty(ip);
|
|
|
|
dir->i_ctime = dir->i_mtime = current_time(dir);
|
|
|
|
mark_inode_dirty(dir);
|
|
|
|
iplist[0] = dir;
|
|
iplist[1] = ip;
|
|
rc = txCommit(tid, 2, iplist, 0);
|
|
|
|
out3:
|
|
txEnd(tid);
|
|
mutex_unlock(&JFS_IP(ip)->commit_mutex);
|
|
mutex_unlock(&JFS_IP(dir)->commit_mutex);
|
|
if (rc) {
|
|
free_ea_wmap(ip);
|
|
clear_nlink(ip);
|
|
discard_new_inode(ip);
|
|
} else {
|
|
d_instantiate_new(dentry, ip);
|
|
}
|
|
|
|
out1:
|
|
free_UCSname(&dname);
|
|
|
|
out:
|
|
jfs_info("jfs_mknod: returning %d", rc);
|
|
return rc;
|
|
}
|
|
|
|
static struct dentry *jfs_lookup(struct inode *dip, struct dentry *dentry, unsigned int flags)
|
|
{
|
|
struct btstack btstack;
|
|
ino_t inum;
|
|
struct inode *ip;
|
|
struct component_name key;
|
|
int rc;
|
|
|
|
jfs_info("jfs_lookup: name = %pd", dentry);
|
|
|
|
if ((rc = get_UCSname(&key, dentry)))
|
|
return ERR_PTR(rc);
|
|
rc = dtSearch(dip, &key, &inum, &btstack, JFS_LOOKUP);
|
|
free_UCSname(&key);
|
|
if (rc == -ENOENT) {
|
|
ip = NULL;
|
|
} else if (rc) {
|
|
jfs_err("jfs_lookup: dtSearch returned %d", rc);
|
|
ip = ERR_PTR(rc);
|
|
} else {
|
|
ip = jfs_iget(dip->i_sb, inum);
|
|
if (IS_ERR(ip))
|
|
jfs_err("jfs_lookup: iget failed on inum %d", (uint)inum);
|
|
}
|
|
|
|
return d_splice_alias(ip, dentry);
|
|
}
|
|
|
|
static struct inode *jfs_nfs_get_inode(struct super_block *sb,
|
|
u64 ino, u32 generation)
|
|
{
|
|
struct inode *inode;
|
|
|
|
if (ino == 0)
|
|
return ERR_PTR(-ESTALE);
|
|
inode = jfs_iget(sb, ino);
|
|
if (IS_ERR(inode))
|
|
return ERR_CAST(inode);
|
|
|
|
if (generation && inode->i_generation != generation) {
|
|
iput(inode);
|
|
return ERR_PTR(-ESTALE);
|
|
}
|
|
|
|
return inode;
|
|
}
|
|
|
|
struct dentry *jfs_fh_to_dentry(struct super_block *sb, struct fid *fid,
|
|
int fh_len, int fh_type)
|
|
{
|
|
return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
|
|
jfs_nfs_get_inode);
|
|
}
|
|
|
|
struct dentry *jfs_fh_to_parent(struct super_block *sb, struct fid *fid,
|
|
int fh_len, int fh_type)
|
|
{
|
|
return generic_fh_to_parent(sb, fid, fh_len, fh_type,
|
|
jfs_nfs_get_inode);
|
|
}
|
|
|
|
struct dentry *jfs_get_parent(struct dentry *dentry)
|
|
{
|
|
unsigned long parent_ino;
|
|
|
|
parent_ino =
|
|
le32_to_cpu(JFS_IP(d_inode(dentry))->i_dtroot.header.idotdot);
|
|
|
|
return d_obtain_alias(jfs_iget(dentry->d_sb, parent_ino));
|
|
}
|
|
|
|
const struct inode_operations jfs_dir_inode_operations = {
|
|
.create = jfs_create,
|
|
.lookup = jfs_lookup,
|
|
.link = jfs_link,
|
|
.unlink = jfs_unlink,
|
|
.symlink = jfs_symlink,
|
|
.mkdir = jfs_mkdir,
|
|
.rmdir = jfs_rmdir,
|
|
.mknod = jfs_mknod,
|
|
.rename = jfs_rename,
|
|
.listxattr = jfs_listxattr,
|
|
.setattr = jfs_setattr,
|
|
.fileattr_get = jfs_fileattr_get,
|
|
.fileattr_set = jfs_fileattr_set,
|
|
#ifdef CONFIG_JFS_POSIX_ACL
|
|
.get_inode_acl = jfs_get_acl,
|
|
.set_acl = jfs_set_acl,
|
|
#endif
|
|
};
|
|
|
|
const struct file_operations jfs_dir_operations = {
|
|
.read = generic_read_dir,
|
|
.iterate = jfs_readdir,
|
|
.fsync = jfs_fsync,
|
|
.unlocked_ioctl = jfs_ioctl,
|
|
.compat_ioctl = compat_ptr_ioctl,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
static int jfs_ci_hash(const struct dentry *dir, struct qstr *this)
|
|
{
|
|
unsigned long hash;
|
|
int i;
|
|
|
|
hash = init_name_hash(dir);
|
|
for (i=0; i < this->len; i++)
|
|
hash = partial_name_hash(tolower(this->name[i]), hash);
|
|
this->hash = end_name_hash(hash);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int jfs_ci_compare(const struct dentry *dentry,
|
|
unsigned int len, const char *str, const struct qstr *name)
|
|
{
|
|
int i, result = 1;
|
|
|
|
if (len != name->len)
|
|
goto out;
|
|
for (i=0; i < len; i++) {
|
|
if (tolower(str[i]) != tolower(name->name[i]))
|
|
goto out;
|
|
}
|
|
result = 0;
|
|
out:
|
|
return result;
|
|
}
|
|
|
|
static int jfs_ci_revalidate(struct dentry *dentry, unsigned int flags)
|
|
{
|
|
/*
|
|
* This is not negative dentry. Always valid.
|
|
*
|
|
* Note, rename() to existing directory entry will have ->d_inode,
|
|
* and will use existing name which isn't specified name by user.
|
|
*
|
|
* We may be able to drop this positive dentry here. But dropping
|
|
* positive dentry isn't good idea. So it's unsupported like
|
|
* rename("filename", "FILENAME") for now.
|
|
*/
|
|
if (d_really_is_positive(dentry))
|
|
return 1;
|
|
|
|
/*
|
|
* This may be nfsd (or something), anyway, we can't see the
|
|
* intent of this. So, since this can be for creation, drop it.
|
|
*/
|
|
if (!flags)
|
|
return 0;
|
|
|
|
/*
|
|
* Drop the negative dentry, in order to make sure to use the
|
|
* case sensitive name which is specified by user if this is
|
|
* for creation.
|
|
*/
|
|
if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
const struct dentry_operations jfs_ci_dentry_operations =
|
|
{
|
|
.d_hash = jfs_ci_hash,
|
|
.d_compare = jfs_ci_compare,
|
|
.d_revalidate = jfs_ci_revalidate,
|
|
};
|