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/*
* vfs.c
*
* This file implements kernel downcalls from lento.
*
* Author: Rob Simmonds <simmonds@stelias.com>
* Andreas Dilger <adilger@stelias.com>
* Copyright (C) 2000 Stelias Computing Inc
* Copyright (C) 2000 Red Hat Inc.
*
* Extended attribute support
* Copyright (C) 2001 Shirish H. Phatak, Tacit Networks, Inc.
*
* This code is based on code from namei.c in the linux file system;
* see copyright notice below.
*/
/** namei.c copyright **/
/*
* linux/fs/namei.c
*
* Copyright (C) 1991, 1992 Linus Torvalds
*/
/*
* Some corrections by tytso.
*/
/* [Feb 1997 T. Schoebel-Theuer] Complete rewrite of the pathname
* lookup logic.
*/
/** end of namei.c copyright **/
#include <linux/mm.h>
#include <linux/proc_fs.h>
#include <linux/smp_lock.h>
#include <linux/quotaops.h>
#include <asm/uaccess.h>
#include <asm/unaligned.h>
#include <asm/semaphore.h>
#include <asm/pgtable.h>
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/blk.h>
#include <linux/intermezzo_fs.h>
#include <linux/intermezzo_upcall.h>
#include <linux/intermezzo_psdev.h>
#include <linux/intermezzo_kml.h>
#ifdef CONFIG_FS_EXT_ATTR
#include <linux/ext_attr.h>
/*
* CONFIG_FS_POSIX_ACL is used by both the XFS and bestbits
* acl implementations, although they are not compatible
* yet. This is a temporary workaround, meaning that
* intermezzo will not be able to use posix acls supplied
* by XFS
*/
#if 0 /* Temporary XFS workaround */
/* #ifdef CONFIG_FS_POSIX_ACL */
#include <linux/posix_acl.h>
#endif
#endif
extern struct inode_operations presto_sym_iops;
/*
* It's inline, so penalty for filesystems that don't use sticky bit is
* minimal.
*/
static inline int check_sticky(struct inode *dir, struct inode *inode)
{
if (!(dir->i_mode & S_ISVTX))
return 0;
if (inode->i_uid == current->fsuid)
return 0;
if (dir->i_uid == current->fsuid)
return 0;
return !capable(CAP_FOWNER);
}
/* from linux/fs/namei.c */
static inline int may_delete(struct inode *dir,struct dentry *victim, int isdir)
{
int error;
if (!victim->d_inode || victim->d_parent->d_inode != dir)
return -ENOENT;
error = permission(dir,MAY_WRITE | MAY_EXEC);
if (error)
return error;
if (IS_APPEND(dir))
return -EPERM;
if (check_sticky(dir, victim->d_inode)||IS_APPEND(victim->d_inode)||
IS_IMMUTABLE(victim->d_inode))
return -EPERM;
if (isdir) {
if (!S_ISDIR(victim->d_inode->i_mode))
return -ENOTDIR;
if (IS_ROOT(victim))
return -EBUSY;
} else if (S_ISDIR(victim->d_inode->i_mode))
return -EISDIR;
return 0;
}
/* from linux/fs/namei.c */
static inline int may_create(struct inode *dir, struct dentry *child) {
if (child->d_inode)
return -EEXIST;
if (IS_DEADDIR(dir))
return -ENOENT;
return permission(dir,MAY_WRITE | MAY_EXEC);
}
#ifdef PRESTO_DEBUG
/* The loop_discard_io() function is available via a kernel patch to the
* loop block device. It "works" by accepting writes, but throwing them
* away, rather than trying to write them to disk. The old method worked
* by setting the underlying device read-only, but that has the problem
* that dirty buffers are kept in memory, and ext3 didn't like that at all.
*/
#ifdef CONFIG_LOOP_DISCARD
#define BLKDEV_FAIL(dev,fail) loop_discard_io(dev,fail)
#else
#define BLKDEV_FAIL(dev,fail) set_device_ro(dev, 1)
#endif
/* If a breakpoint has been set via /proc/sys/intermezzo/intermezzoX/errorval,
* that is the same as "value", the underlying device will "fail" now.
*/
inline void presto_debug_fail_blkdev(struct presto_file_set *fset,
unsigned long value)
{
int minor = presto_f2m(fset);
int errorval = upc_comms[minor].uc_errorval;
kdev_t dev = fset->fset_mtpt->d_inode->i_dev;
if (errorval && errorval == (long)value && !is_read_only(dev)) {
CDEBUG(D_SUPER, "setting device %s read only\n", kdevname(dev));
BLKDEV_FAIL(dev, 1);
upc_comms[minor].uc_errorval = -dev;
}
}
#else
#define presto_debug_fail_blkdev(dev,value) do {} while (0)
#endif
static inline int presto_do_kml(struct lento_vfs_context *info, struct inode* inode)
{
if ( ! (info->flags & LENTO_FL_KML) )
return 0;
if ( inode->i_gid == presto_excluded_gid )
return 0;
return 1;
}
static inline int presto_do_expect(struct lento_vfs_context *info, struct inode *inode)
{
if ( ! (info->flags & LENTO_FL_EXPECT) )
return 0;
if ( inode->i_gid == presto_excluded_gid )
return 0;
return 1;
}
/* XXX fixme: this should not fail, all these dentries are in memory
when _we_ call this */
int presto_settime(struct presto_file_set *fset,
struct dentry *dentry,
struct lento_vfs_context *ctx,
int valid)
{
int error;
struct inode *inode = dentry->d_inode;
struct inode_operations *iops;
struct iattr iattr;
ENTRY;
if (ctx->flags & LENTO_FL_IGNORE_TIME ) {
EXIT;
return 0;
}
iattr.ia_ctime = ctx->updated_time;
iattr.ia_mtime = ctx->updated_time;
iattr.ia_valid = valid;
error = -EROFS;
if (IS_RDONLY(inode)) {
EXIT;
return -EROFS;
}
if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) {
EXIT;
return -EPERM;
}
error = -EPERM;
iops = filter_c2cdiops(fset->fset_cache->cache_filter);
if (!iops) {
EXIT;
return error;
}
if (iops->setattr != NULL)
error = iops->setattr(dentry, &iattr);
else {
error = 0;
inode_setattr(dentry->d_inode, &iattr);
}
EXIT;
return error;
}
int presto_do_setattr(struct presto_file_set *fset, struct dentry *dentry,
struct iattr *iattr, struct lento_vfs_context *info)
{
struct rec_info rec;
struct inode *inode = dentry->d_inode;
struct inode_operations *iops;
int error;
struct presto_version old_ver, new_ver;
void *handle;
off_t old_size=inode->i_size;
ENTRY;
error = -EROFS;
if (IS_RDONLY(inode)) {
EXIT;
return -EROFS;
}
if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) {
EXIT;
return -EPERM;
}
presto_getversion(&old_ver, dentry->d_inode);
error = -EPERM;
iops = filter_c2cdiops(fset->fset_cache->cache_filter);
if (!iops &&
!iops->setattr) {
EXIT;
return error;
}
error = presto_reserve_space(fset->fset_cache, 2*PRESTO_REQHIGH);
if (error) {
EXIT;
return error;
}
if (iattr->ia_valid & ATTR_SIZE) {
handle = presto_trans_start(fset, dentry->d_inode, PRESTO_OP_TRUNC);
} else {
handle = presto_trans_start(fset, dentry->d_inode, PRESTO_OP_SETATTR);
}
if ( IS_ERR(handle) ) {
printk("presto_do_setattr: no space for transaction\n");
presto_release_space(fset->fset_cache, 2*PRESTO_REQHIGH);
return -ENOSPC;
}
if (dentry->d_inode && iops->setattr) {
error = iops->setattr(dentry, iattr);
} else {
error = inode_change_ok(dentry->d_inode, iattr);
if (!error)
inode_setattr(inode, iattr);
}
if (!error && (iattr->ia_valid & ATTR_SIZE))
vmtruncate(inode, iattr->ia_size);
if (error) {
EXIT;
goto exit;
}
presto_debug_fail_blkdev(fset, PRESTO_OP_SETATTR | 0x10);
if ( presto_do_kml(info, dentry->d_inode) ) {
if ((iattr->ia_valid & ATTR_SIZE) && (old_size != inode->i_size)) {
struct file file;
/* Journal a close whenever we see a potential truncate
* At the receiving end, lento should explicitly remove
* ATTR_SIZE from the list of valid attributes */
presto_getversion(&new_ver, inode);
file.private_data = NULL;
file.f_dentry = dentry;
error=presto_journal_close(&rec, fset, &file, dentry, &new_ver);
}
if (!error)
error = presto_journal_setattr(&rec, fset, dentry, &old_ver, iattr);
}
presto_debug_fail_blkdev(fset, PRESTO_OP_SETATTR | 0x20);
if ( presto_do_expect(info, dentry->d_inode) )
error = presto_write_last_rcvd(&rec, fset, info);
presto_debug_fail_blkdev(fset, PRESTO_OP_SETATTR | 0x30);
EXIT;
exit:
presto_release_space(fset->fset_cache, 2*PRESTO_REQHIGH);
presto_trans_commit(fset, handle);
return error;
}
int lento_setattr(const char *name, struct iattr *iattr,
struct lento_vfs_context *info)
{
struct nameidata nd;
struct dentry *dentry;
struct presto_file_set *fset;
int error;
#if 0 /* Temporary XFS workaround */
/* #ifdef CONFIG_FS_POSIX_ACL */
int (*set_posix_acl)(struct inode *, int type, posix_acl_t *)=NULL;
#endif
ENTRY;
CDEBUG(D_PIOCTL,"name %s, valid %#x, mode %#o, uid %d, gid %d, size %Ld\n",
name, iattr->ia_valid, iattr->ia_mode, iattr->ia_uid,
iattr->ia_gid, iattr->ia_size);
CDEBUG(D_PIOCTL, "atime %#lx, mtime %#lx, ctime %#lx, attr_flags %#x\n",
iattr->ia_atime, iattr->ia_mtime, iattr->ia_ctime,
iattr->ia_attr_flags);
CDEBUG(D_PIOCTL, "offset %d, recno %d, flags %#x\n",
info->slot_offset, info->recno, info->flags);
lock_kernel();
error = presto_walk(name, &nd);
if (error) {
EXIT;
goto exit;
}
dentry = nd.dentry;
fset = presto_fset(dentry);
error = -EINVAL;
if ( !fset ) {
printk("No fileset!\n");
EXIT;
goto exit_lock;
}
/* NOTE: this prevents us from changing the filetype on setattr,
* as we normally only want to change permission bits.
* If this is not correct, then we need to fix the perl code
* to always send the file type OR'ed with the permission.
*/
if (iattr->ia_valid & ATTR_MODE) {
int set_mode = iattr->ia_mode;
iattr->ia_mode = (iattr->ia_mode & S_IALLUGO) |
(dentry->d_inode->i_mode & ~S_IALLUGO);
CDEBUG(D_PIOCTL, "chmod: orig %#o, set %#o, result %#o\n",
dentry->d_inode->i_mode, set_mode, iattr->ia_mode);
#if 0 /* Temporary XFS workaround */
/* #ifdef CONFIG_FS_POSIX_ACL */
/* ACl code interacts badly with setattr
* since it tries to modify the ACL using
* set_ext_attr which recurses back into presto.
* This only happens if ATTR_MODE is set.
* Here we are doing a "forced" mode set
* (initiated by lento), so we disable the
* set_posix_acl operation which
* prevents such recursion. -SHP
*
* This will probably still be required when native
* acl journalling is in place.
*/
set_posix_acl=dentry->d_inode->i_op->set_posix_acl;
dentry->d_inode->i_op->set_posix_acl=NULL;
#endif
}
error = presto_do_setattr(fset, dentry, iattr, info);
#if 0 /* Temporary XFS workaround */
/* #ifdef CONFIG_FS_POSIX_ACL */
/* restore the inode_operations if we changed them*/
if (iattr->ia_valid & ATTR_MODE)
dentry->d_inode->i_op->set_posix_acl=set_posix_acl;
#endif
EXIT;
exit_lock:
path_release(&nd);
exit:
unlock_kernel();
return error;
}
int presto_do_create(struct presto_file_set *fset, struct dentry *dir,
struct dentry *dentry, int mode,
struct lento_vfs_context *info)
{
struct rec_info rec;
int error;
struct presto_version tgt_dir_ver, new_file_ver;
struct inode_operations *iops;
void *handle;
ENTRY;
mode &= S_IALLUGO;
mode |= S_IFREG;
down(&dir->d_inode->i_zombie);
error = presto_reserve_space(fset->fset_cache, PRESTO_REQHIGH);
if (error) {
EXIT;
up(&dir->d_inode->i_zombie);
return error;
}
error = may_create(dir->d_inode, dentry);
if (error) {
EXIT;
goto exit_pre_lock;
}
error = -EPERM;
iops = filter_c2cdiops(fset->fset_cache->cache_filter);
if (!iops->create) {
EXIT;
goto exit_pre_lock;
}
presto_getversion(&tgt_dir_ver, dir->d_inode);
handle = presto_trans_start(fset, dir->d_inode, PRESTO_OP_CREATE);
if ( IS_ERR(handle) ) {
EXIT;
presto_release_space(fset->fset_cache, PRESTO_REQHIGH);
printk("presto_do_create: no space for transaction\n");
error=-ENOSPC;
goto exit_pre_lock;
}
DQUOT_INIT(dir->d_inode);
lock_kernel();
error = iops->create(dir->d_inode, dentry, mode);
if (error) {
EXIT;
goto exit_lock;
}
if (dentry->d_inode &&
dentry->d_inode->i_gid != presto_excluded_gid) {
struct presto_cache *cache = fset->fset_cache;
/* was this already done? */
if ( !filter_c2cfiops(cache->cache_filter) )
filter_setup_file_ops(cache->cache_filter,
dentry->d_inode,
&presto_file_iops,
&presto_file_fops);
/* make the new inode ours */
dentry->d_inode->i_op =
filter_c2ufiops(cache->cache_filter);
dentry->d_inode->i_fop =
filter_c2uffops(cache->cache_filter);
filter_setup_dentry_ops(cache->cache_filter,
dentry->d_op,
&presto_dentry_ops);
dentry->d_op = filter_c2udops(cache->cache_filter);
/* if Lento creates this file, we won't have data */
if ( ISLENTO(presto_c2m(cache)) ) {
presto_set(dentry, PRESTO_ATTR);
} else {
presto_set(dentry, PRESTO_ATTR | PRESTO_DATA);
}
}
error = presto_settime(fset, dir, info, ATTR_CTIME | ATTR_MTIME);
if (error) {
EXIT;
goto exit_lock;
}
error = presto_settime(fset, dentry, info, ATTR_CTIME | ATTR_MTIME);
if (error) {
EXIT;
goto exit_lock;
}
presto_debug_fail_blkdev(fset, PRESTO_OP_CREATE | 0x10);
presto_getversion(&new_file_ver, dentry->d_inode);
if ( presto_do_kml(info, dentry->d_inode) )
error = presto_journal_create(&rec, fset, dentry, &tgt_dir_ver,
&new_file_ver,
dentry->d_inode->i_mode);
presto_debug_fail_blkdev(fset, PRESTO_OP_CREATE | 0x20);
if ( presto_do_expect(info, dentry->d_inode) )
error = presto_write_last_rcvd(&rec, fset, info);
presto_debug_fail_blkdev(fset, PRESTO_OP_CREATE | 0x30);
EXIT;
exit_lock:
unlock_kernel();
presto_trans_commit(fset, handle);
exit_pre_lock:
presto_release_space(fset->fset_cache, PRESTO_REQHIGH);
up(&dir->d_inode->i_zombie);
return error;
}
/* from namei.c */
static struct dentry *lookup_create(struct nameidata *nd, int is_dir)
{
struct dentry *dentry;
down(&nd->dentry->d_inode->i_sem);
dentry = ERR_PTR(-EEXIST);
if (nd->last_type != LAST_NORM)
goto fail;
dentry = lookup_hash(&nd->last, nd->dentry);
if (IS_ERR(dentry))
goto fail;
if (!is_dir && nd->last.name[nd->last.len] && !dentry->d_inode)
goto enoent;
return dentry;
enoent:
dput(dentry);
dentry = ERR_PTR(-ENOENT);
fail:
return dentry;
}
int lento_create(const char *name, int mode, struct lento_vfs_context *info)
{
int error;
struct nameidata nd;
char * pathname;
struct dentry *dentry;
struct presto_file_set *fset;
ENTRY;
pathname = getname(name);
error = PTR_ERR(pathname);
if (IS_ERR(pathname)) {
EXIT;
goto exit;
}
/* this looks up the parent */
// if (path_init(pathname, LOOKUP_FOLLOW | LOOKUP_POSITIVE, &nd))
if (path_init(pathname, LOOKUP_PARENT, &nd))
error = path_walk(pathname, &nd);
if (error) {
EXIT;
goto exit;
}
dentry = lookup_create(&nd, 0);
error = PTR_ERR(dentry);
if (IS_ERR(dentry)) {
EXIT;
goto exit_lock;
}
fset = presto_fset(dentry);
error = -EINVAL;
if ( !fset ) {
printk("No fileset!\n");
EXIT;
goto exit_lock;
}
error = presto_do_create(fset, dentry->d_parent, dentry, (mode&S_IALLUGO)|S_IFREG,
info);
EXIT;
exit_lock:
path_release (&nd);
dput(dentry);
up(&dentry->d_parent->d_inode->i_sem);
putname(pathname);
exit:
return error;
}
int presto_do_link(struct presto_file_set *fset, struct dentry *old_dentry,
struct dentry *dir, struct dentry *new_dentry,
struct lento_vfs_context *info)
{
struct rec_info rec;
struct inode *inode;
int error;
struct inode_operations *iops;
struct presto_version tgt_dir_ver;
struct presto_version new_link_ver;
void *handle;
down(&dir->d_inode->i_zombie);
error = presto_reserve_space(fset->fset_cache, PRESTO_REQHIGH);
if (error) {
EXIT;
up(&dir->d_inode->i_zombie);
return error;
}
error = -ENOENT;
inode = old_dentry->d_inode;
if (!inode)
goto exit_lock;
error = may_create(dir->d_inode, new_dentry);
if (error)
goto exit_lock;
error = -EXDEV;
if (dir->d_inode->i_dev != inode->i_dev)
goto exit_lock;
/*
* A link to an append-only or immutable file cannot be created.
*/
error = -EPERM;
if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) {
EXIT;
goto exit_lock;
}
iops = filter_c2cdiops(fset->fset_cache->cache_filter);
if (!iops->link) {
EXIT;
goto exit_lock;
}
presto_getversion(&tgt_dir_ver, dir->d_inode);
handle = presto_trans_start(fset, dir->d_inode, PRESTO_OP_LINK);
if ( IS_ERR(handle) ) {
presto_release_space(fset->fset_cache, PRESTO_REQHIGH);
printk("presto_do_link: no space for transaction\n");
return -ENOSPC;
}
DQUOT_INIT(dir->d_inode);
lock_kernel();
error = iops->link(old_dentry, dir->d_inode, new_dentry);
unlock_kernel();
if (error) {
EXIT;
goto exit_lock;
}
error = presto_settime(fset, dir, info, ATTR_CTIME | ATTR_MTIME);
if (error) {
EXIT;
goto exit_lock;
}
error = presto_settime(fset, new_dentry, info, ATTR_CTIME);
if (error) {
EXIT;
goto exit_lock;
}
presto_debug_fail_blkdev(fset, PRESTO_OP_LINK | 0x10);
presto_getversion(&new_link_ver, new_dentry->d_inode);
if ( presto_do_kml(info, old_dentry->d_inode) )
error = presto_journal_link(&rec, fset, old_dentry, new_dentry,
&tgt_dir_ver, &new_link_ver);
presto_debug_fail_blkdev(fset, PRESTO_OP_LINK | 0x20);
if ( presto_do_expect(info, old_dentry->d_inode) )
error = presto_write_last_rcvd(&rec, fset, info);
presto_debug_fail_blkdev(fset, PRESTO_OP_LINK | 0x30);
EXIT;
presto_trans_commit(fset, handle);
exit_lock:
presto_release_space(fset->fset_cache, PRESTO_REQHIGH);
up(&dir->d_inode->i_zombie);
return error;
}
int lento_link(const char * oldname, const char * newname,
struct lento_vfs_context *info)
{
int error;
char * from;
char * to;
struct presto_file_set *fset;
from = getname(oldname);
if(IS_ERR(from))
return PTR_ERR(from);
to = getname(newname);
error = PTR_ERR(to);
if (!IS_ERR(to)) {
struct dentry *new_dentry;
struct nameidata nd, old_nd;
error = 0;
if (path_init(from, LOOKUP_POSITIVE, &old_nd))
error = path_walk(from, &old_nd);
if (error)
goto exit;
if (path_init(to, LOOKUP_PARENT, &nd))
error = path_walk(to, &nd);
if (error)
goto out;
error = -EXDEV;
if (old_nd.mnt != nd.mnt)
goto out;
new_dentry = lookup_create(&nd, 0);
error = PTR_ERR(new_dentry);
if (!IS_ERR(new_dentry)) {
fset = presto_fset(new_dentry);
error = -EINVAL;
if ( !fset ) {
printk("No fileset!\n");
EXIT;
goto out2;
}
error = presto_do_link(fset, old_nd.dentry,
nd.dentry,
new_dentry, info);
dput(new_dentry);
}
out2:
up(&nd.dentry->d_inode->i_sem);
path_release(&nd);
out:
path_release(&old_nd);
exit:
putname(to);
}
putname(from);
return error;
}
int presto_do_unlink(struct presto_file_set *fset, struct dentry *dir,
struct dentry *dentry, struct lento_vfs_context *info)
{
struct rec_info rec;
int error;
struct inode_operations *iops;
struct presto_version tgt_dir_ver, old_file_ver;
void *handle;
int do_kml = 0, do_expect =0;
int linkno = 0;
ENTRY;
down(&dir->d_inode->i_zombie);
error = may_delete(dir->d_inode, dentry, 0);
if (error) {
EXIT;
up(&dir->d_inode->i_zombie);
return error;
}
error = -EPERM;
iops = filter_c2cdiops(fset->fset_cache->cache_filter);
if (!iops->unlink) {
EXIT;
up(&dir->d_inode->i_zombie);
return error;
}
error = presto_reserve_space(fset->fset_cache, PRESTO_REQLOW);
if (error) {
EXIT;
up(&dir->d_inode->i_zombie);
return error;
}
presto_getversion(&tgt_dir_ver, dir->d_inode);
presto_getversion(&old_file_ver, dentry->d_inode);
handle = presto_trans_start(fset, dir->d_inode, PRESTO_OP_UNLINK);
if ( IS_ERR(handle) ) {
presto_release_space(fset->fset_cache, PRESTO_REQLOW);
printk("ERROR: presto_do_unlink: no space for transaction. Tell Peter.\n");
up(&dir->d_inode->i_zombie);
return -ENOSPC;
}
DQUOT_INIT(dir->d_inode);
if (d_mountpoint(dentry))
error = -EBUSY;
else {
lock_kernel();
linkno = dentry->d_inode->i_nlink;
if (linkno > 1) {
dget(dentry);
}
do_kml = presto_do_kml(info, dir->d_inode);
do_expect = presto_do_expect(info, dir->d_inode);
error = iops->unlink(dir->d_inode, dentry);
unlock_kernel();
if (!error)
d_delete(dentry);
}
if (linkno > 1) {
error = presto_settime(fset, dentry, info, ATTR_CTIME);
dput(dentry);
if (error) {
EXIT;
goto exit;
}
}
error = presto_settime(fset, dir, info, ATTR_CTIME | ATTR_MTIME);
if (error) {
EXIT;
goto exit;
}
up(&dir->d_inode->i_zombie);
if (error) {
EXIT;
goto exit;
}
presto_debug_fail_blkdev(fset, PRESTO_OP_UNLINK | 0x10);
if ( do_kml ) {
error = presto_journal_unlink(&rec, fset, dir, &tgt_dir_ver,
&old_file_ver,
dentry->d_name.len,
dentry->d_name.name);
}
presto_debug_fail_blkdev(fset, PRESTO_OP_UNLINK | 0x20);
if ( do_expect ) {
error = presto_write_last_rcvd(&rec, fset, info);
}
presto_debug_fail_blkdev(fset, PRESTO_OP_UNLINK | 0x30);
EXIT;
exit:
presto_release_space(fset->fset_cache, PRESTO_REQLOW);
presto_trans_commit(fset, handle);
return error;
}
int lento_unlink(const char *pathname, struct lento_vfs_context *info)
{
int error = 0;
char * name;
struct dentry *dentry;
struct nameidata nd;
struct presto_file_set *fset;
ENTRY;
name = getname(pathname);
if(IS_ERR(name))
return PTR_ERR(name);
if (path_init(name, LOOKUP_PARENT, &nd))
error = path_walk(name, &nd);
if (error)
goto exit;
error = -EISDIR;
if (nd.last_type != LAST_NORM)
goto exit1;
down(&nd.dentry->d_inode->i_sem);
dentry = lookup_hash(&nd.last, nd.dentry);
error = PTR_ERR(dentry);
if (!IS_ERR(dentry)) {
fset = presto_fset(dentry);
error = -EINVAL;
if ( !fset ) {
printk("No fileset!\n");
EXIT;
goto exit2;
}
/* Why not before? Because we want correct error value */
if (nd.last.name[nd.last.len])
goto slashes;
error = presto_do_unlink(fset, nd.dentry, dentry, info);
exit2:
EXIT;
dput(dentry);
}
up(&nd.dentry->d_inode->i_sem);
exit1:
path_release(&nd);
exit:
putname(name);
return error;
slashes:
error = !dentry->d_inode ? -ENOENT :
S_ISDIR(dentry->d_inode->i_mode) ? -EISDIR : -ENOTDIR;
goto exit2;
}
int presto_do_symlink(struct presto_file_set *fset, struct dentry *dir,
struct dentry *dentry, const char *oldname,
struct lento_vfs_context *info)
{
struct rec_info rec;
int error;
struct presto_version tgt_dir_ver, new_link_ver;
struct inode_operations *iops;
void *handle;
ENTRY;
down(&dir->d_inode->i_zombie);
/* record + max path len + space to free */
error = presto_reserve_space(fset->fset_cache, PRESTO_REQHIGH + 4096);
if (error) {
EXIT;
up(&dir->d_inode->i_zombie);
return error;
}
error = may_create(dir->d_inode, dentry);
if (error) {
EXIT;
goto exit_lock;
}
error = -EPERM;
iops = filter_c2cdiops(fset->fset_cache->cache_filter);
if (!iops->symlink) {
EXIT;
goto exit_lock;
}
presto_getversion(&tgt_dir_ver, dir->d_inode);
handle = presto_trans_start(fset, dir->d_inode, PRESTO_OP_SYMLINK);
if ( IS_ERR(handle) ) {
presto_release_space(fset->fset_cache, PRESTO_REQHIGH + 4096);
printk("ERROR: presto_do_symlink: no space for transaction. Tell Peter.\n");
EXIT;
return -ENOSPC;
}
DQUOT_INIT(dir->d_inode);
lock_kernel();
error = iops->symlink(dir->d_inode, dentry, oldname);
if (error) {
EXIT;
goto exit;
}
if (dentry->d_inode &&
dentry->d_inode->i_gid != presto_excluded_gid) {
struct presto_cache *cache = fset->fset_cache;
/* was this already done? */
if ( !filter_c2csiops(cache->cache_filter) )
filter_setup_symlink_ops(cache->cache_filter,
dentry->d_inode,
&presto_sym_iops,
NULL);
/* make the new inode ours */
dentry->d_inode->i_op = filter_c2usiops(cache->cache_filter);
filter_setup_dentry_ops(cache->cache_filter, dentry->d_op,
&presto_dentry_ops);
dentry->d_op = filter_c2udops(cache->cache_filter);
/* XXX ? Cache state ? if Lento creates a symlink */
if ( ISLENTO(presto_c2m(cache)) ) {
presto_set(dentry, PRESTO_ATTR);
} else {
presto_set(dentry, PRESTO_ATTR | PRESTO_DATA);
}
}
error = presto_settime(fset, dir, info, ATTR_CTIME | ATTR_MTIME);
if (error) {
EXIT;
goto exit;
}
error = presto_settime(fset, dentry, info, ATTR_CTIME | ATTR_MTIME);
if (error) {
EXIT;
goto exit;
}
presto_debug_fail_blkdev(fset, PRESTO_OP_SYMLINK | 0x10);
presto_getversion(&new_link_ver, dentry->d_inode);
if ( presto_do_kml(info, dentry->d_inode) )
error = presto_journal_symlink(&rec, fset, dentry, oldname,
&tgt_dir_ver, &new_link_ver);
presto_debug_fail_blkdev(fset, PRESTO_OP_SYMLINK | 0x20);
if ( presto_do_expect(info, dentry->d_inode) )
error = presto_write_last_rcvd(&rec, fset, info);
presto_debug_fail_blkdev(fset, PRESTO_OP_SYMLINK | 0x30);
EXIT;
exit:
unlock_kernel();
presto_trans_commit(fset, handle);
exit_lock:
presto_release_space(fset->fset_cache, PRESTO_REQHIGH + 4096);
up(&dir->d_inode->i_zombie);
return error;
}
int lento_symlink(const char *oldname, const char *newname,
struct lento_vfs_context *info)
{
int error;
char *from;
char *to;
struct dentry *dentry;
struct presto_file_set *fset;
struct nameidata nd;
ENTRY;
lock_kernel();
from = getname(oldname);
error = PTR_ERR(from);
if (IS_ERR(from)) {
EXIT;
goto exit;
}
to = getname(newname);
error = PTR_ERR(to);
if (IS_ERR(to)) {
EXIT;
goto exit_from;
}
if (path_init(to, LOOKUP_PARENT, &nd))
error = path_walk(to, &nd);
if (error) {
EXIT;
goto exit_to;
}
dentry = lookup_create(&nd, 0);
error = PTR_ERR(dentry);
if (IS_ERR(dentry)) {
path_release(&nd);
EXIT;
goto exit_to;
}
fset = presto_fset(dentry);
error = -EINVAL;
if ( !fset ) {
printk("No fileset!\n");
path_release(&nd);
EXIT;
goto exit_lock;
}
error = presto_do_symlink(fset, nd.dentry,
dentry, oldname, info);
path_release(&nd);
EXIT;
exit_lock:
up(&nd.dentry->d_inode->i_sem);
dput(dentry);
exit_to:
putname(to);
exit_from:
putname(from);
exit:
unlock_kernel();
return error;
}
int presto_do_mkdir(struct presto_file_set *fset, struct dentry *dir,
struct dentry *dentry, int mode,
struct lento_vfs_context *info)
{
struct rec_info rec;
int error;
struct presto_version tgt_dir_ver, new_dir_ver;
void *handle;
ENTRY;
down(&dir->d_inode->i_zombie);
/* one journal record + directory block + room for removals*/
error = presto_reserve_space(fset->fset_cache, PRESTO_REQHIGH + 4096);
if (error) {
EXIT;
up(&dir->d_inode->i_zombie);
return error;
}
error = may_create(dir->d_inode, dentry);
if (error) {
EXIT;
goto exit_lock;
}
error = -EPERM;
if (!filter_c2cdiops(fset->fset_cache->cache_filter)->mkdir) {
EXIT;
goto exit_lock;
}
error = -ENOSPC;
presto_getversion(&tgt_dir_ver, dir->d_inode);
handle = presto_trans_start(fset, dir->d_inode, PRESTO_OP_MKDIR);
if ( IS_ERR(handle) ) {
presto_release_space(fset->fset_cache, PRESTO_REQHIGH + 4096);
printk("presto_do_mkdir: no space for transaction\n");
goto exit_lock;
}
DQUOT_INIT(dir->d_inode);
mode &= (S_IRWXUGO|S_ISVTX);
lock_kernel();
error = filter_c2cdiops(fset->fset_cache->cache_filter)->mkdir(dir->d_inode, dentry, mode);
if (error) {
EXIT;
goto exit;
}
if ( dentry->d_inode && !error &&
dentry->d_inode->i_gid != presto_excluded_gid) {
struct presto_cache *cache = fset->fset_cache;
/* make it ours */
dentry->d_inode->i_op = filter_c2udiops(cache->cache_filter);
filter_setup_dentry_ops(cache->cache_filter,
dentry->d_op,
&presto_dentry_ops);
dentry->d_op = filter_c2udops(cache->cache_filter);
/* if Lento does this, we won't have data */
if ( ISLENTO(presto_c2m(cache)) ) {
presto_set(dentry, PRESTO_ATTR);
} else {
presto_set(dentry, PRESTO_ATTR | PRESTO_DATA);
}
}
error = presto_settime(fset, dir, info, ATTR_CTIME | ATTR_MTIME);
if (error) {
EXIT;
goto exit;
}
error = presto_settime(fset, dentry, info, ATTR_CTIME | ATTR_MTIME);
if (error) {
EXIT;
goto exit;
}
presto_debug_fail_blkdev(fset, PRESTO_OP_MKDIR | 0x10);
presto_getversion(&new_dir_ver, dentry->d_inode);
if ( presto_do_kml(info, dentry->d_inode) )
error = presto_journal_mkdir(&rec, fset, dentry, &tgt_dir_ver,
&new_dir_ver,
dentry->d_inode->i_mode);
presto_debug_fail_blkdev(fset, PRESTO_OP_MKDIR | 0x20);
if ( presto_do_expect(info, dentry->d_inode) )
error = presto_write_last_rcvd(&rec, fset, info);
presto_debug_fail_blkdev(fset, PRESTO_OP_MKDIR | 0x30);
EXIT;
exit:
unlock_kernel();
presto_trans_commit(fset, handle);
exit_lock:
presto_release_space(fset->fset_cache, PRESTO_REQHIGH + 4096);
up(&dir->d_inode->i_zombie);
return error;
}
/*
* Look out: this function may change a normal dentry
* into a directory dentry (different size)..
*/
int lento_mkdir(const char *name, int mode, struct lento_vfs_context *info)
{
int error;
char *pathname;
struct dentry *dentry;
struct presto_file_set *fset;
struct nameidata nd;
ENTRY;
CDEBUG(D_PIOCTL, "name: %s, mode %o, offset %d, recno %d, flags %x\n",
name, mode, info->slot_offset, info->recno, info->flags);
pathname = getname(name);
error = PTR_ERR(pathname);
if (IS_ERR(pathname)) {
EXIT;
return error;
}
if (path_init(pathname, LOOKUP_PARENT, &nd))
error = path_walk(pathname, &nd);
if (error)
goto out_name;
dentry = lookup_create(&nd, 1);
error = PTR_ERR(dentry);
if (!IS_ERR(dentry)) {
fset = presto_fset(dentry);
error = -EINVAL;
if ( !fset ) {
printk("No fileset!\n");
EXIT;
goto out_dput;
}
error = presto_do_mkdir(fset, nd.dentry, dentry,
mode & S_IALLUGO, info);
out_dput:
dput(dentry);
}
up(&nd.dentry->d_inode->i_sem);
path_release(&nd);
out_name:
EXIT;
putname(pathname);
CDEBUG(D_PIOCTL, "error: %d\n", error);
return error;
}
static void d_unhash(struct dentry *dentry)
{
dget(dentry);
switch (atomic_read(&dentry->d_count)) {
default:
shrink_dcache_parent(dentry);
if (atomic_read(&dentry->d_count) != 2)
break;
case 2:
d_drop(dentry);
}
}
int presto_do_rmdir(struct presto_file_set *fset, struct dentry *dir,
struct dentry *dentry, struct lento_vfs_context *info)
{
struct rec_info rec;
int error;
struct presto_version tgt_dir_ver, old_dir_ver;
struct inode_operations *iops;
void *handle;
int do_kml, do_expect;
int size;
ENTRY;
error = may_delete(dir->d_inode, dentry, 1);
if (error)
return error;
error = -EPERM;
iops = filter_c2cdiops(fset->fset_cache->cache_filter);
if (!iops->rmdir) {
EXIT;
return error;
}
size = PRESTO_REQHIGH - dentry->d_inode->i_size;
error = presto_reserve_space(fset->fset_cache, size);
if (error) {
EXIT;
return error;
}
presto_getversion(&tgt_dir_ver, dir->d_inode);
presto_getversion(&old_dir_ver, dentry->d_inode);
handle = presto_trans_start(fset, dir->d_inode, PRESTO_OP_RMDIR);
if ( IS_ERR(handle) ) {
presto_release_space(fset->fset_cache, size);
printk("ERROR: presto_do_rmdir: no space for transaction. Tell Peter.\n");
return -ENOSPC;
}
DQUOT_INIT(dir->d_inode);
do_kml = presto_do_kml(info, dir->d_inode);
do_expect = presto_do_expect(info, dir->d_inode);
double_down(&dir->d_inode->i_zombie, &dentry->d_inode->i_zombie);
d_unhash(dentry);
if (IS_DEADDIR(dir->d_inode))
error = -ENOENT;
else if (d_mountpoint(dentry))
error = -EBUSY;
else {
lock_kernel();
error = iops->rmdir(dir->d_inode, dentry);
unlock_kernel();
if (!error) {
dentry->d_inode->i_flags |= S_DEAD;
error = presto_settime(fset, dir, info,
ATTR_CTIME | ATTR_MTIME);
}
}
double_up(&dir->d_inode->i_zombie, &dentry->d_inode->i_zombie);
if (!error)
d_delete(dentry);
dput(dentry);
presto_debug_fail_blkdev(fset, PRESTO_OP_RMDIR | 0x10);
if ( !error && do_kml )
error = presto_journal_rmdir(&rec, fset, dir, &tgt_dir_ver,
&old_dir_ver,
dentry->d_name.len,
dentry->d_name.name);
presto_debug_fail_blkdev(fset, PRESTO_OP_RMDIR | 0x20);
if ( !error && do_expect )
error = presto_write_last_rcvd(&rec, fset, info);
presto_debug_fail_blkdev(fset, PRESTO_OP_RMDIR | 0x30);
EXIT;
presto_trans_commit(fset, handle);
presto_release_space(fset->fset_cache, size);
return error;
}
int lento_rmdir(const char *pathname, struct lento_vfs_context *info)
{
int error = 0;
char * name;
struct dentry *dentry;
struct presto_file_set *fset;
struct nameidata nd;
ENTRY;
name = getname(pathname);
if(IS_ERR(name))
return PTR_ERR(name);
if (path_init(name, LOOKUP_PARENT, &nd))
error = path_walk(name, &nd);
if (error)
goto exit;
switch(nd.last_type) {
case LAST_DOTDOT:
error = -ENOTEMPTY;
goto exit1;
case LAST_ROOT: case LAST_DOT:
error = -EBUSY;
goto exit1;
}
down(&nd.dentry->d_inode->i_sem);
dentry = lookup_hash(&nd.last, nd.dentry);
error = PTR_ERR(dentry);
if (!IS_ERR(dentry)) {
fset = presto_fset(dentry);
error = -EINVAL;
if ( !fset ) {
printk("No fileset!\n");
EXIT;
goto exit_put;
}
error = presto_do_rmdir(fset, nd.dentry, dentry, info);
exit_put:
dput(dentry);
}
up(&nd.dentry->d_inode->i_sem);
exit1:
EXIT;
path_release(&nd);
exit:
EXIT;
putname(name);
return error;
}
int presto_do_mknod(struct presto_file_set *fset, struct dentry *dir,
struct dentry *dentry, int mode, dev_t dev,
struct lento_vfs_context *info)
{
struct rec_info rec;
int error = -EPERM;
struct presto_version tgt_dir_ver, new_node_ver;
struct inode_operations *iops;
void *handle;
ENTRY;
down(&dir->d_inode->i_zombie);
/* one KML entry */
error = presto_reserve_space(fset->fset_cache, PRESTO_REQHIGH);
if (error) {
EXIT;
up(&dir->d_inode->i_zombie);
return error;
}
if ((S_ISCHR(mode) || S_ISBLK(mode)) && !capable(CAP_MKNOD)) {
EXIT;
goto exit_lock;
}
error = may_create(dir->d_inode, dentry);
if (error) {
EXIT;
goto exit_lock;
}
error = -EPERM;
iops = filter_c2cdiops(fset->fset_cache->cache_filter);
if (!iops->mknod) {
EXIT;
goto exit_lock;
}
DQUOT_INIT(dir->d_inode);
lock_kernel();
error = -ENOSPC;
presto_getversion(&tgt_dir_ver, dir->d_inode);
handle = presto_trans_start(fset, dir->d_inode, PRESTO_OP_MKNOD);
if ( IS_ERR(handle) ) {
presto_release_space(fset->fset_cache, PRESTO_REQHIGH);
printk("presto_do_mknod: no space for transaction\n");
goto exit_lock2;
}
error = iops->mknod(dir->d_inode, dentry, mode, dev);
if (error) {
EXIT;
goto exit_commit;
}
if ( dentry->d_inode &&
dentry->d_inode->i_gid != presto_excluded_gid) {
struct presto_cache *cache = fset->fset_cache;
/* make it ours */
dentry->d_inode->i_op = filter_c2udiops(cache->cache_filter);
filter_setup_dentry_ops(cache->cache_filter, dentry->d_op,
&presto_dentry_ops);
dentry->d_op = filter_c2udops(cache->cache_filter);
/* if Lento does this, we won't have data */
if ( ISLENTO(presto_c2m(cache)) ) {
presto_set(dentry, PRESTO_ATTR);
} else {
presto_set(dentry, PRESTO_ATTR | PRESTO_DATA);
}
}
error = presto_settime(fset, dir, info, ATTR_MTIME);
if (error) {
EXIT;
}
error = presto_settime(fset, dentry, info, ATTR_CTIME | ATTR_MTIME);
if (error) {
EXIT;
}
presto_debug_fail_blkdev(fset, PRESTO_OP_MKNOD | 0x10);
presto_getversion(&new_node_ver, dentry->d_inode);
if ( presto_do_kml(info, dentry->d_inode) )
error = presto_journal_mknod(&rec, fset, dentry, &tgt_dir_ver,
&new_node_ver,
dentry->d_inode->i_mode,
MAJOR(dev), MINOR(dev) );
presto_debug_fail_blkdev(fset, PRESTO_OP_MKNOD | 0x20);
if ( presto_do_expect(info, dentry->d_inode) )
error = presto_write_last_rcvd(&rec, fset, info);
presto_debug_fail_blkdev(fset, PRESTO_OP_MKNOD | 0x30);
EXIT;
exit_commit:
presto_trans_commit(fset, handle);
exit_lock2:
unlock_kernel();
exit_lock:
presto_release_space(fset->fset_cache, PRESTO_REQHIGH);
up(&dir->d_inode->i_zombie);
return error;
}
int lento_mknod(const char *filename, int mode, dev_t dev,
struct lento_vfs_context *info)
{
int error = 0;
char * tmp;
struct dentry * dentry;
struct nameidata nd;
struct presto_file_set *fset;
ENTRY;
if (S_ISDIR(mode))
return -EPERM;
tmp = getname(filename);
if (IS_ERR(tmp))
return PTR_ERR(tmp);
if (path_init(tmp, LOOKUP_PARENT, &nd))
error = path_walk(tmp, &nd);
if (error)
goto out;
dentry = lookup_create(&nd, 0);
error = PTR_ERR(dentry);
if (!IS_ERR(dentry)) {
fset = presto_fset(dentry);
error = -EINVAL;
if ( !fset ) {
printk("No fileset!\n");
EXIT;
goto exit_put;
}
switch (mode & S_IFMT) {
case 0: case S_IFREG:
error = -EOPNOTSUPP;
break;
case S_IFCHR: case S_IFBLK: case S_IFIFO: case S_IFSOCK:
error = presto_do_mknod(fset, nd.dentry, dentry,
mode, dev, info);
break;
case S_IFDIR:
error = -EPERM;
break;
default:
error = -EINVAL;
}
exit_put:
dput(dentry);
}
up(&nd.dentry->d_inode->i_sem);
path_release(&nd);
out:
putname(tmp);
return error;
}
static int do_rename(struct presto_file_set *fset,
struct dentry *old_parent, struct dentry *old_dentry,
struct dentry *new_parent, struct dentry *new_dentry,
struct lento_vfs_context *info)
{
struct rec_info rec;
int error;
struct inode_operations *iops;
struct presto_version src_dir_ver, tgt_dir_ver;
void *handle;
int new_inode_unlink = 0;
struct inode *old_dir = old_parent->d_inode;
struct inode *new_dir = new_parent->d_inode;
ENTRY;
presto_getversion(&src_dir_ver, old_dir);
presto_getversion(&tgt_dir_ver, new_dir);
error = -EPERM;
iops = filter_c2cdiops(fset->fset_cache->cache_filter);
if (!iops || !iops->rename) {
EXIT;
return error;
}
error = presto_reserve_space(fset->fset_cache, PRESTO_REQHIGH);
if (error) {
EXIT;
return error;
}
handle = presto_trans_start(fset, old_dir, PRESTO_OP_RENAME);
if ( IS_ERR(handle) ) {
presto_release_space(fset->fset_cache, PRESTO_REQHIGH);
printk("presto_do_rename: no space for transaction\n");
return -ENOSPC;
}
if (new_dentry->d_inode && new_dentry->d_inode->i_nlink > 1) {
dget(new_dentry);
new_inode_unlink = 1;
}
error = iops->rename(old_dir, old_dentry, new_dir, new_dentry);
if (error) {
EXIT;
goto exit;
}
if (new_inode_unlink) {
error = presto_settime(fset, old_dentry, info, ATTR_CTIME);
dput(old_dentry);
if (error) {
EXIT;
goto exit;
}
}
error = presto_settime(fset, old_parent, info, ATTR_CTIME | ATTR_MTIME);
if (error) {
EXIT;
goto exit;
}
error = presto_settime(fset, new_parent, info, ATTR_CTIME | ATTR_MTIME);
if (error) {
EXIT;
goto exit;
}
/* XXX make a distinction between cross file set
* and intra file set renames here
*/
presto_debug_fail_blkdev(fset, PRESTO_OP_RENAME | 0x10);
if ( presto_do_kml(info, old_dir) )
error = presto_journal_rename(&rec, fset, old_dentry, new_dentry,
&src_dir_ver, &tgt_dir_ver);
presto_debug_fail_blkdev(fset, PRESTO_OP_RENAME | 0x20);
if ( presto_do_expect(info, new_dir) )
error = presto_write_last_rcvd(&rec, fset, info);
presto_debug_fail_blkdev(fset, PRESTO_OP_RENAME | 0x30);
EXIT;
exit:
presto_trans_commit(fset, handle);
presto_release_space(fset->fset_cache, PRESTO_REQHIGH);
return error;
}
static
int presto_rename_dir(struct presto_file_set *fset, struct dentry *old_parent,
struct dentry *old_dentry, struct dentry *new_parent,
struct dentry *new_dentry, struct lento_vfs_context *info)
{
int error;
struct inode *target;
struct inode *old_dir = old_parent->d_inode;
struct inode *new_dir = new_parent->d_inode;
if (old_dentry->d_inode == new_dentry->d_inode)
return 0;
error = may_delete(old_dir, old_dentry, 1);
if (error)
return error;
if (new_dir->i_dev != old_dir->i_dev)
return -EXDEV;
if (!new_dentry->d_inode)
error = may_create(new_dir, new_dentry);
else
error = may_delete(new_dir, new_dentry, 1);
if (error)
return error;
if (!old_dir->i_op || !old_dir->i_op->rename)
return -EPERM;
/*
* If we are going to change the parent - check write permissions,
* we'll need to flip '..'.
*/
if (new_dir != old_dir) {
error = permission(old_dentry->d_inode, MAY_WRITE);
}
if (error)
return error;
DQUOT_INIT(old_dir);
DQUOT_INIT(new_dir);
down(&old_dir->i_sb->s_vfs_rename_sem);
error = -EINVAL;
if (is_subdir(new_dentry, old_dentry))
goto out_unlock;
target = new_dentry->d_inode;
if (target) { /* Hastur! Hastur! Hastur! */
triple_down(&old_dir->i_zombie,
&new_dir->i_zombie,
&target->i_zombie);
d_unhash(new_dentry);
} else
double_down(&old_dir->i_zombie,
&new_dir->i_zombie);
if (IS_DEADDIR(old_dir)||IS_DEADDIR(new_dir))
error = -ENOENT;
else if (d_mountpoint(old_dentry)||d_mountpoint(new_dentry))
error = -EBUSY;
else
error = do_rename(fset, old_parent, old_dentry,
new_parent, new_dentry, info);
if (target) {
if (!error)
target->i_flags |= S_DEAD;
triple_up(&old_dir->i_zombie,
&new_dir->i_zombie,
&target->i_zombie);
if (d_unhashed(new_dentry))
d_rehash(new_dentry);
dput(new_dentry);
} else
double_up(&old_dir->i_zombie,
&new_dir->i_zombie);
if (!error)
d_move(old_dentry,new_dentry);
out_unlock:
up(&old_dir->i_sb->s_vfs_rename_sem);
return error;
}
static
int presto_rename_other(struct presto_file_set *fset, struct dentry *old_parent,
struct dentry *old_dentry, struct dentry *new_parent,
struct dentry *new_dentry, struct lento_vfs_context *info)
{
struct inode *old_dir = old_parent->d_inode;
struct inode *new_dir = new_parent->d_inode;
int error;
if (old_dentry->d_inode == new_dentry->d_inode)
return 0;
error = may_delete(old_dir, old_dentry, 0);
if (error)
return error;
if (new_dir->i_dev != old_dir->i_dev)
return -EXDEV;
if (!new_dentry->d_inode)
error = may_create(new_dir, new_dentry);
else
error = may_delete(new_dir, new_dentry, 0);
if (error)
return error;
if (!old_dir->i_op || !old_dir->i_op->rename)
return -EPERM;
DQUOT_INIT(old_dir);
DQUOT_INIT(new_dir);
double_down(&old_dir->i_zombie, &new_dir->i_zombie);
if (d_mountpoint(old_dentry)||d_mountpoint(new_dentry))
error = -EBUSY;
else
error = do_rename(fset, old_parent, old_dentry,
new_parent, new_dentry, info);
double_up(&old_dir->i_zombie, &new_dir->i_zombie);
if (error)
return error;
/* The following d_move() should become unconditional */
if (!(old_dir->i_sb->s_type->fs_flags & FS_ODD_RENAME)) {
d_move(old_dentry, new_dentry);
}
return 0;
}
int presto_do_rename(struct presto_file_set *fset,
struct dentry *old_parent, struct dentry *old_dentry,
struct dentry *new_parent, struct dentry *new_dentry,
struct lento_vfs_context *info)
{
if (S_ISDIR(old_dentry->d_inode->i_mode))
return presto_rename_dir(fset, old_parent,old_dentry,new_parent,
new_dentry, info);
else
return presto_rename_other(fset, old_parent, old_dentry,
new_parent,new_dentry, info);
}
int lento_do_rename(const char *oldname, const char *newname,
struct lento_vfs_context *info)
{
int error = 0;
struct dentry * old_dir, * new_dir;
struct dentry * old_dentry, *new_dentry;
struct nameidata oldnd, newnd;
struct presto_file_set *fset;
ENTRY;
if (path_init(oldname, LOOKUP_PARENT, &oldnd))
error = path_walk(oldname, &oldnd);
if (error)
goto exit;
if (path_init(newname, LOOKUP_PARENT, &newnd))
error = path_walk(newname, &newnd);
if (error)
goto exit1;
error = -EXDEV;
if (oldnd.mnt != newnd.mnt)
goto exit2;
old_dir = oldnd.dentry;
error = -EBUSY;
if (oldnd.last_type != LAST_NORM)
goto exit2;
new_dir = newnd.dentry;
if (newnd.last_type != LAST_NORM)
goto exit2;
double_lock(new_dir, old_dir);
old_dentry = lookup_hash(&oldnd.last, old_dir);
error = PTR_ERR(old_dentry);
if (IS_ERR(old_dentry))
goto exit3;
/* source must exist */
error = -ENOENT;
if (!old_dentry->d_inode)
goto exit4;
fset = presto_fset(old_dentry);
error = -EINVAL;
if ( !fset ) {
printk("No fileset!\n");
EXIT;
goto exit4;
}
/* unless the source is a directory trailing slashes give -ENOTDIR */
if (!S_ISDIR(old_dentry->d_inode->i_mode)) {
error = -ENOTDIR;
if (oldnd.last.name[oldnd.last.len])
goto exit4;
if (newnd.last.name[newnd.last.len])
goto exit4;
}
new_dentry = lookup_hash(&newnd.last, new_dir);
error = PTR_ERR(new_dentry);
if (IS_ERR(new_dentry))
goto exit4;
lock_kernel();
error = presto_do_rename(fset, old_dir, old_dentry,
new_dir, new_dentry, info);
unlock_kernel();
dput(new_dentry);
exit4:
dput(old_dentry);
exit3:
double_up(&new_dir->d_inode->i_sem, &old_dir->d_inode->i_sem);
exit2:
path_release(&newnd);
exit1:
path_release(&oldnd);
exit:
return error;
}
int lento_rename(const char * oldname, const char * newname,
struct lento_vfs_context *info)
{
int error;
char * from;
char * to;
from = getname(oldname);
if(IS_ERR(from))
return PTR_ERR(from);
to = getname(newname);
error = PTR_ERR(to);
if (!IS_ERR(to)) {
error = lento_do_rename(from,to, info);
putname(to);
}
putname(from);
return error;
}
struct dentry *presto_iopen(struct dentry *dentry,
ino_t ino, unsigned int generation)
{
struct presto_file_set *fset;
char name[48];
int error;
ENTRY;
/* see if we already have the dentry we want */
if (dentry->d_inode && dentry->d_inode->i_ino == ino &&
dentry->d_inode->i_generation == generation) {
EXIT;
return dentry;
}
/* Make sure we have a cache beneath us. We should always find at
* least one dentry inside the cache (if it exists), otherwise not
* even the cache root exists, or we passed in a bad name.
*/
fset = presto_fset(dentry);
error = -EINVAL;
if (!fset) {
printk("No fileset for %*s!\n",
dentry->d_name.len, dentry->d_name.name);
EXIT;
dput(dentry);
return ERR_PTR(error);
}
dput(dentry);
sprintf(name, "%s%#lx%c%#x",
PRESTO_ILOOKUP_MAGIC, ino, PRESTO_ILOOKUP_SEP, generation);
CDEBUG(D_PIOCTL, "opening %ld by number (as %s)\n", ino, name);
return lookup_one_len(name, fset->fset_mtpt, strlen(name));
}
static struct file *presto_filp_dopen(struct dentry *dentry, int flags)
{
struct file *f;
struct inode *inode;
int flag, error;
ENTRY;
error = -ENFILE;
f = get_empty_filp();
if (!f) {
CDEBUG(D_PIOCTL, "error getting file pointer\n");
EXIT;
goto out;
}
f->f_flags = flag = flags;
f->f_mode = (flag+1) & O_ACCMODE;
inode = dentry->d_inode;
if (f->f_mode & FMODE_WRITE) {
error = get_write_access(inode);
if (error) {
CDEBUG(D_PIOCTL, "error getting write access\n");
EXIT;
goto cleanup_file;
}
}
f->f_dentry = dentry;
f->f_pos = 0;
f->f_reada = 0;
f->f_op = NULL;
if (inode->i_op)
/* XXX should we set to presto ops, or leave at cache ops? */
f->f_op = inode->i_fop;
if (f->f_op && f->f_op->open) {
error = f->f_op->open(inode, f);
if (error) {
CDEBUG(D_PIOCTL, "error calling cache 'open'\n");
EXIT;
goto cleanup_all;
}
}
f->f_flags &= ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC);
return f;
cleanup_all:
if (f->f_mode & FMODE_WRITE)
put_write_access(inode);
cleanup_file:
put_filp(f);
out:
return ERR_PTR(error);
}
/* Open an inode by number. We pass in the cache root name (or a subdirectory
* from the cache that is guaranteed to exist) to be able to access the cache.
*/
int lento_iopen(const char *name, ino_t ino, unsigned int generation,
int flags)
{
char * tmp;
struct dentry *dentry;
struct nameidata nd;
int fd;
int error;
ENTRY;
CDEBUG(D_PIOCTL,
"open %s:inode %#lx (%ld), generation %x (%d), flags %d \n",
name, ino, ino, generation, generation, flags);
/* We don't allow creation of files by number only, as it would
* lead to a dangling files not in any directory. We could also
* just turn off the flag and ignore it.
*/
if (flags & O_CREAT) {
printk(KERN_WARNING __FUNCTION__
": create file by inode number (%ld) not allowed\n",ino);
EXIT;
return -EACCES;
}
tmp = getname(name);
if (IS_ERR(tmp)) {
EXIT;
return PTR_ERR(tmp);
}
lock_kernel();
again: /* look the named file or a parent directory so we can get the cache */
error = presto_walk(tmp, &nd);
if ( error && error != -ENOENT ) {
EXIT;
return error;
}
if (error == -ENOENT)
dentry = NULL;
else
dentry = nd.dentry;
/* we didn't find the named file, so see if a parent exists */
if (!dentry) {
char *slash;
slash = strrchr(tmp, '/');
if (slash && slash != tmp) {
*slash = '\0';
path_release(&nd);
goto again;
}
/* we should never get here... */
CDEBUG(D_PIOCTL, "no more path components to try!\n");
fd = -ENOENT;
goto exit;
}
CDEBUG(D_PIOCTL, "returned dentry %p\n", dentry);
dentry = presto_iopen(dentry, ino, generation);
fd = PTR_ERR(dentry);
if (IS_ERR(dentry)) {
EXIT;
goto exit;
}
/* XXX start of code that might be replaced by something like:
* if (flags & (O_WRONLY | O_RDWR)) {
* error = get_write_access(dentry->d_inode);
* if (error) {
* EXIT;
* goto cleanup_dput;
* }
* }
* fd = open_dentry(dentry, flags);
*
* including the presto_filp_dopen() function (check dget counts!)
*/
fd = get_unused_fd();
if (fd < 0) {
EXIT;
goto cleanup_dput;
}
{
int error;
struct file * f = presto_filp_dopen(dentry, flags);
error = PTR_ERR(f);
if (IS_ERR(f)) {
put_unused_fd(fd);
fd = error;
EXIT;
goto cleanup_dput;
}
fd_install(fd, f);
}
/* end of code that might be replaced by open_dentry */
EXIT;
exit:
unlock_kernel();
path_release(&nd);
putname(tmp);
return fd;
cleanup_dput:
putname(&nd);
goto exit;
}
int lento_close(unsigned int fd, struct lento_vfs_context *info)
{
struct rec_info rec;
int error;
struct file * filp;
struct dentry *dentry;
int do_kml, do_expect;
ENTRY;
lock_kernel();
error = -EBADF;
filp = fcheck(fd);
if (filp) {
struct files_struct * files = current->files;
dentry = filp->f_dentry;
dget(dentry);
do_kml = presto_do_kml(info, dentry->d_inode);
do_expect = presto_do_expect(info, dentry->d_inode);
files->fd[fd] = NULL;
put_unused_fd(fd);
FD_CLR(fd, files->close_on_exec);
error = filp_close(filp, files);
} else {
EXIT;
return error;
}
if (error) {
EXIT;
goto exit;
}
if ( do_kml ) {
struct presto_file_set *fset;
struct presto_version new_file_ver;
fset = presto_fset(dentry);
error = -EINVAL;
if (!fset) {
printk("No fileset for %*s!\n",
dentry->d_name.len, dentry->d_name.name);
EXIT;
goto exit;
}
presto_getversion(&new_file_ver, dentry->d_inode);
error = presto_journal_close(&rec, fset, filp, dentry,
&new_file_ver);
if ( error ) {
printk("presto: close error %d!\n", error);
EXIT;
goto exit;
}
if ( do_expect )
error = presto_write_last_rcvd(&rec, fset, info);
}
EXIT;
exit:
dput(dentry);
unlock_kernel();
return error;
}
#ifdef CONFIG_FS_EXT_ATTR
#if 0 /* Temporary XFS workaround */
/* #ifdef CONFIG_FS_POSIX_ACL */
/* Posix ACL code changes i_mode without using a notify_change (or
* a mark_inode_dirty!). We need to duplicate this at the reintegrator
* which is done by this function. This function also takes care of
* resetting the cached posix acls in this inode. If we don't reset these
* VFS continues using the old acl information, which by now may be out of
* date.
*/
int presto_setmode(struct presto_file_set *fset, struct dentry *dentry,
mode_t mode)
{
struct inode *inode = dentry->d_inode;
ENTRY;
/* The extended attributes for this inode were modified.
* At this point we can not be sure if any of the ACL
* information for this inode was updated. So we will
* force VFS to reread the acls. Note that we do this
* only when called from the SETEXTATTR ioctl, which is why we
* do this while setting the mode of the file. Also note
* that mark_inode_dirty is not be needed for i_*acl only
* to force i_mode info to disk, and should be removed once
* we use notify_change to update the mode.
* XXX: is mode setting really needed? Just setting acl's should
* be enough! VFS should change the i_mode as needed? SHP
*/
if (inode->i_acl &&
inode->i_acl != POSIX_ACL_NOT_CACHED)
posix_acl_release(inode->i_acl);
if (inode->i_default_acl &&
inode->i_default_acl != POSIX_ACL_NOT_CACHED)
posix_acl_release(inode->i_default_acl);
inode->i_acl = POSIX_ACL_NOT_CACHED;
inode->i_default_acl = POSIX_ACL_NOT_CACHED;
inode->i_mode = mode;
/* inode should already be dirty...but just in case */
mark_inode_dirty(inode);
return 0;
#if 0
/* XXX: The following code is the preferred way to set mode,
* however, I need to carefully go through possible recursion
* paths back into presto. See comments in presto_do_setattr.
*/
{
int error=0;
struct super_operations *sops;
struct iattr iattr;
iattr.ia_mode = mode;
iattr.ia_valid = ATTR_MODE|ATTR_FORCE;
error = -EPERM;
sops = filter_c2csops(fset->fset_cache->cache_filter);
if (!sops &&
!sops->notify_change) {
EXIT;
return error;
}
error = sops->notify_change(dentry, &iattr);
EXIT;
return error;
}
#endif
}
#endif
/* setextattr Interface to cache filesystem */
int presto_do_set_ext_attr(struct presto_file_set *fset,
struct dentry *dentry,
const char *name, void *buffer,
size_t buffer_len, int flags, mode_t *mode,
struct lento_vfs_context *info)
{
struct rec_info rec;
struct inode *inode = dentry->d_inode;
struct inode_operations *iops;
int error;
struct presto_version ver;
void *handle;
char temp[PRESTO_EXT_ATTR_NAME_MAX+1];
ENTRY;
error = -EROFS;
if (IS_RDONLY(inode)) {
EXIT;
return -EROFS;
}
if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) {
EXIT;
return -EPERM;
}
presto_getversion(&ver, inode);
error = -EPERM;
/* We need to invoke different filters based on whether
* this dentry is a regular file, directory or symlink.
*/
switch (inode->i_mode & S_IFMT) {
case S_IFLNK: /* symlink */
iops = filter_c2csiops(fset->fset_cache->cache_filter);
break;
case S_IFDIR: /* directory */
iops = filter_c2cdiops(fset->fset_cache->cache_filter);
break;
case S_IFREG:
default: /* everything else including regular files */
iops = filter_c2cfiops(fset->fset_cache->cache_filter);
}
if (!iops && !iops->set_ext_attr) {
EXIT;
return error;
}
error = presto_reserve_space(fset->fset_cache, PRESTO_REQHIGH);
if (error) {
EXIT;
return error;
}
handle = presto_trans_start(fset,dentry->d_inode,PRESTO_OP_SETEXTATTR);
if ( IS_ERR(handle) ) {
printk("presto_do_set_ext_attr: no space for transaction\n");
presto_release_space(fset->fset_cache, PRESTO_REQHIGH);
return -ENOSPC;
}
/* We first "truncate" name to the maximum allowable in presto */
/* This simulates the strncpy_from_use code in fs/ext_attr.c */
strncpy(temp,name,sizeof(temp));
/* Pass down to cache*/
error = iops->set_ext_attr(inode,temp,buffer,buffer_len,flags);
if (error) {
EXIT;
goto exit;
}
#if 0 /* Temporary XFS workaround */
/* #ifdef CONFIG_FS_POSIX_ACL */
/* Reset mode if specified*/
/* XXX: when we do native acl support, move this code out! */
if (mode != NULL) {
error = presto_setmode(fset, dentry, *mode);
if (error) {
EXIT;
goto exit;
}
}
#endif
/* Reset ctime. Only inode change time (ctime) is affected */
error = presto_settime(fset, dentry, info, ATTR_CTIME);
if (error) {
EXIT;
goto exit;
}
if (flags & EXT_ATTR_FLAG_USER) {
printk(" USER flag passed to presto_do_set_ext_attr!\n");
*(int *)0 = 1;
}
/* We are here, so set_ext_attr succeeded. We no longer need to keep
* track of EXT_ATTR_FLAG_{EXISTS,CREATE}, instead, we will force
* the attribute value during log replay. -SHP
*/
flags &= ~(EXT_ATTR_FLAG_EXISTS | EXT_ATTR_FLAG_CREATE);
presto_debug_fail_blkdev(fset, PRESTO_OP_SETEXTATTR | 0x10);
if ( presto_do_kml(info, dentry->d_inode) )
error = presto_journal_set_ext_attr
(&rec, fset, dentry, &ver, name, buffer,
buffer_len, flags);
presto_debug_fail_blkdev(fset, PRESTO_OP_SETEXTATTR | 0x20);
if ( presto_do_expect(info, dentry->d_inode) )
error = presto_write_last_rcvd(&rec, fset, info);
presto_debug_fail_blkdev(fset, PRESTO_OP_SETEXTATTR | 0x30);
EXIT;
exit:
presto_release_space(fset->fset_cache, PRESTO_REQHIGH);
presto_trans_commit(fset, handle);
return error;
}
#endif
|