dir.c 26.67 KiB
/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=8:tabstop=8:
*
* Copyright (C) 2004 Cluster File Systems, Inc.
*
* This file is part of Lustre, http://www.lustre.org.
*
* Lustre is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*
* Lustre is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Lustre; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#define DEBUG_SUBSYSTEM S_SM
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/stat.h>
#include <linux/unistd.h>
#include <linux/smp_lock.h>
#include <linux/obd_class.h>
#include <linux/obd_support.h>
#include <linux/lustre_lib.h>
#include <linux/lustre_idl.h>
#include <linux/lustre_fsfilt.h>
#include <linux/lustre_smfs.h>
#include <linux/lustre_snap.h>
#include <linux/security.h>
#include "smfs_internal.h"
//#define NAME_ALLOC_LEN(len) ((len+16) & ~15)
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
static int smfs_create(struct inode *dir, struct dentry *dentry,
int mode)
#else
static int smfs_create(struct inode *dir, struct dentry *dentry,
int mode, struct nameidata *nd)
#endif
{
struct inode *inode = NULL;
struct inode *parent = I2CI(dentry->d_parent->d_inode);
struct inode *cache_dir = I2CI(dir);
struct dentry *cache_dentry = NULL;
struct dentry *cache_parent = NULL;
void *handle = NULL;
struct hook_msg msg = {
.dentry = dentry,
};
int rc = 0;
ENTRY;
LASSERT(cache_dir);
LASSERT(cache_dir->i_op->create);
cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
if (!cache_dentry || !cache_parent) { rc = -ENOMEM;
goto exit;
}
handle = smfs_trans_start(dir, FSFILT_OP_CREATE, NULL);
if (IS_ERR(handle)) {
rc = -ENOSPC;
goto exit;
}
SMFS_PRE_HOOK(dir, HOOK_CREATE, &msg);
pre_smfs_inode(dir, cache_dir);
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
rc = cache_dir->i_op->create(cache_dir, cache_dentry, mode);
#else
rc = cache_dir->i_op->create(cache_dir, cache_dentry, mode, nd);
#endif
if (!rc) {
inode = smfs_get_inode(dir->i_sb, cache_dentry->d_inode->i_ino,
dir, 0);
if (inode) {
d_instantiate(dentry, inode);
}
else
rc = -ENOENT;
}
SMFS_POST_HOOK(dir, HOOK_CREATE, &msg, rc);
post_smfs_inode(dir, cache_dir);
smfs_trans_commit(dir, handle, 0);
exit:
post_smfs_dentry(cache_dentry);
post_smfs_dentry(cache_parent);
RETURN(rc);
}
static struct dentry * iopen_connect_dentry(struct dentry * dentry,
struct inode *inode, int rehash)
{
struct dentry *tmp, *goal = NULL;
struct list_head *lp;
/* verify this dentry is really new */
LASSERT(dentry->d_inode == NULL);
LASSERT(list_empty(&dentry->d_alias)); /* d_instantiate */
if (rehash)
LASSERT(d_unhashed(dentry)); /* d_rehash */
LASSERT(list_empty(&dentry->d_subdirs));
spin_lock(&dcache_lock);
if (!inode)
goto do_rehash;
/* preferrably return a connected dentry */
list_for_each(lp, &inode->i_dentry) {
tmp = list_entry(lp, struct dentry, d_alias);
if (tmp->d_flags & DCACHE_DISCONNECTED) {
LASSERT(tmp->d_alias.next == &inode->i_dentry);
LASSERT(tmp->d_alias.prev == &inode->i_dentry);
goal = tmp;
dget_locked(goal);
break;
}
}
if (!goal) goto do_instantiate;
/* Move the goal to the de hash queue */
goal->d_flags &= ~ DCACHE_DISCONNECTED;
security_d_instantiate(goal, inode);
__d_rehash(dentry);
__d_move(goal, dentry);
spin_unlock(&dcache_lock);
iput(inode);
RETURN(goal);
/* d_add(), but don't drop dcache_lock before adding dentry to inode */
do_instantiate:
list_add(&dentry->d_alias, &inode->i_dentry); /* d_instantiate */
dentry->d_inode = inode;
do_rehash:
if (rehash)
__d_rehash(dentry);
spin_unlock(&dcache_lock);
RETURN(NULL);
}
static int smfs_do_lookup (struct inode * dir,
struct dentry * dentry,
struct nameidata *nd,
struct inode **inode)
{
struct inode *cache_dir = I2CI(dir);
struct inode *parent = I2CI(dentry->d_parent->d_inode);
struct dentry *cache_dentry = NULL;
struct dentry *cache_parent = NULL;
struct dentry *rdentry = NULL, *tmp = NULL;
int rc = 0;
struct hook_msg msg = {
.dentry = dentry,
};
ENTRY;
if (!cache_dir)
RETURN(-ENOENT);
LASSERT(cache_dir->i_op->lookup);
/* preparing artificial backing fs dentries. */
cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
if (!cache_dentry || !cache_parent) {
rc = -ENOMEM;
goto exit;
}
SMFS_PRE_HOOK(dir, HOOK_LOOKUP, &msg);
/* perform lookup in backing fs. */
rdentry = cache_dir->i_op->lookup(cache_dir, cache_dentry, nd);
if (rdentry) {
if (IS_ERR(rdentry)) {
rc = PTR_ERR(rdentry);
rdentry = NULL;
} else {
tmp = rdentry;
}
} else {
tmp = cache_dentry;
}
SMFS_POST_HOOK(dir, HOOK_LOOKUP, &msg, rc);
if (tmp) {
//copy fields if DCACHE_CROSS_REF
smfs_update_dentry(dentry, tmp);
if (tmp->d_inode) {
if (!tmp->d_inode->i_nlink)
CWARN("inode #%lu (%p) nlink is 0\n",
tmp->d_inode->i_ino, tmp->d_inode);
*inode = smfs_get_inode(dir->i_sb, tmp->d_inode->i_ino,
dir, 0);
if (!(*inode))
rc = -ENOENT;
}
}
if (rdentry) {
dput(rdentry);
}
exit:
post_smfs_dentry(cache_dentry);
post_smfs_dentry(cache_parent);
RETURN(rc);
}
static struct dentry * smfs_iopen_lookup(struct inode * dir,
struct dentry *dentry,
struct nameidata *nd)
{
struct dentry * alternate = NULL;
struct inode *inode = NULL;
int rc = 0;
ENTRY;
rc = smfs_do_lookup(dir, dentry, nd, &inode);
if (rc)
RETURN(ERR_PTR(rc));
LASSERT(inode);
/* preferrably return a connected dentry */
spin_lock(&dcache_lock);
list_for_each_entry(alternate, &inode->i_dentry, d_alias) {
LASSERT(!(alternate->d_flags & DCACHE_DISCONNECTED));
}
list_for_each_entry(alternate, &inode->i_dentry, d_alias) {
dget_locked(alternate);
spin_lock(&alternate->d_lock);
alternate->d_flags |= DCACHE_REFERENCED;
spin_unlock(&alternate->d_lock);
iput(inode);
spin_unlock(&dcache_lock);
RETURN(alternate);
}
dentry->d_flags |= DCACHE_DISCONNECTED;
/* d_add(), but don't drop dcache_lock before adding dentry to inode */
list_add(&dentry->d_alias, &inode->i_dentry); /* d_instantiate */
dentry->d_inode = inode;
__d_rehash(dentry); /* d_rehash */
spin_unlock(&dcache_lock);
return NULL;
}
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
static struct dentry *smfs_lookup(struct inode *dir, struct dentry *dentry)
#else
static struct dentry *smfs_lookup(struct inode *dir, struct dentry *dentry,
struct nameidata *nd)
#endif
{
struct dentry * rdentry = NULL;
struct inode * inode = NULL;
int rc;
ENTRY;
rc = smfs_do_lookup(dir, dentry, nd, &inode);
if (rc)
RETURN(ERR_PTR(rc));
//lmv stuff. Special dentry that has no inode.
if (dentry->d_flags & DCACHE_CROSS_REF) {
d_add(dentry, NULL);
RETURN(NULL);
}
//TODO: should flags be checked and copied before?
rdentry = iopen_connect_dentry(dentry, inode, 1);
RETURN(rdentry);
}
static int smfs_lookup_raw(struct inode *dir, const char *name,
int len, ino_t *data)
{
struct inode *cache_dir = I2CI(dir);
int rc = 0;
if (!cache_dir)
RETURN(-ENOENT);
if (cache_dir->i_op->lookup_raw) {
rc = cache_dir->i_op->lookup_raw(cache_dir, name, len, data);
} else {
CWARN("do not have raw lookup ops in bottom fs\n");
}
RETURN(rc);
}
static int smfs_link(struct dentry *old_dentry,
struct inode *dir, struct dentry *dentry)
{
struct inode *parent = I2CI(dentry->d_parent->d_inode);
struct inode *cache_dir = I2CI(dir);
struct inode *old_inode = old_dentry->d_inode;
struct inode *cache_old_inode = I2CI(old_inode);
struct dentry *cache_old_dentry = NULL;
struct dentry *cache_dentry = NULL;
struct dentry *cache_parent = NULL;
void *handle = NULL;
int rc = 0;
struct hook_link_msg msg = {
.dentry = old_dentry,
.new_dentry = dentry
};
ENTRY;
if (!cache_dir)
RETURN(-ENOENT);
if (!cache_old_inode) RETURN(-ENOENT);
cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
cache_old_dentry = pre_smfs_dentry(NULL, cache_old_inode, old_dentry);
if (!cache_old_dentry || !cache_dentry || !cache_parent) {
rc = -ENOMEM;
goto exit;
}
handle = smfs_trans_start(dir, FSFILT_OP_LINK, NULL);
if (IS_ERR(handle)) {
rc = -ENOSPC;
goto exit;
}
pre_smfs_inode(dir, cache_dir);
pre_smfs_inode(old_inode, cache_old_inode);
//lock_kernel();
SMFS_PRE_HOOK(dir, HOOK_LINK, &msg);
rc = cache_dir->i_op->link(cache_old_dentry, cache_dir, cache_dentry);
if (!rc) {
atomic_inc(&old_inode->i_count);
dput(iopen_connect_dentry(dentry, old_inode, 0));
}
SMFS_POST_HOOK(dir, HOOK_LINK, &msg, rc);
post_smfs_inode(old_inode, cache_old_inode);
post_smfs_inode(dir, cache_dir);
smfs_trans_commit(dir, handle, 0);
exit:
//unlock_kernel();
post_smfs_dentry(cache_dentry);
post_smfs_dentry(cache_parent);
post_smfs_dentry(cache_old_dentry);
RETURN(rc);
}
static int smfs_unlink(struct inode * dir, struct dentry *dentry)
{
struct inode *cache_dir = I2CI(dir);
struct inode *cache_inode = I2CI(dentry->d_inode);
struct inode *parent = I2CI(dentry->d_parent->d_inode);
struct dentry *cache_dentry = NULL;
struct dentry *cache_parent = NULL;
void *handle = NULL;
int rc = 0;
//int mode = 0;
struct hook_unlink_msg msg = {
.dentry = dentry,
.mode = dentry->d_inode->i_mode
};
ENTRY;
LASSERT(cache_dir);
LASSERT(cache_inode);
LASSERT(cache_dir->i_op->unlink);
LASSERT(parent);
cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
cache_dentry = pre_smfs_dentry(cache_parent, cache_inode, dentry);
if (!cache_dentry || !cache_parent) {
rc = -ENOMEM; goto exit;
}
handle = smfs_trans_start(dir, FSFILT_OP_UNLINK, NULL);
if (IS_ERR(handle)) {
rc = -ENOSPC;
goto exit;
}
pre_smfs_inode(dir, cache_dir);
pre_smfs_inode(dentry->d_inode, cache_inode);
SMFS_PRE_HOOK(dir, HOOK_UNLINK, &msg);
rc = cache_dir->i_op->unlink(cache_dir, cache_dentry);
SMFS_POST_HOOK(dir, HOOK_UNLINK, &msg, rc);
post_smfs_inode(dentry->d_inode, cache_dentry->d_inode);
post_smfs_inode(dir, cache_dir);
smfs_trans_commit(dir, handle, 0);
exit:
post_smfs_dentry(cache_dentry);
post_smfs_dentry(cache_parent);
RETURN(rc);
}
static int smfs_symlink(struct inode *dir, struct dentry *dentry,
const char *symname)
{
struct inode *cache_dir = I2CI(dir);
struct inode *inode = NULL;
struct inode *parent = I2CI(dentry->d_parent->d_inode);
struct dentry *cache_dentry = NULL;
struct dentry *cache_parent = NULL;
void *handle = NULL;
int rc = 0;
struct hook_symlink_msg msg = {
.dentry = dentry,
.tgt_len = strlen(symname) + 1,
.symname = (char*)symname
};
ENTRY;
LASSERT(cache_dir);
LASSERT(cache_dir->i_op->symlink);
LASSERT(parent);
cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
if (!cache_parent || !cache_dentry) {
rc = -ENOMEM;
goto exit;
}
handle = smfs_trans_start(dir, FSFILT_OP_SYMLINK, NULL);
if (IS_ERR(handle)) {
rc = -ENOSPC;
goto exit;
}
pre_smfs_inode(dir, cache_dir);
SMFS_PRE_HOOK(dir, HOOK_SYMLINK, &msg);
rc = cache_dir->i_op->symlink(cache_dir, cache_dentry, symname);
if (!rc) {
inode = smfs_get_inode(dir->i_sb, cache_dentry->d_inode->i_ino, dir, 0);
if (inode) {
d_instantiate(dentry, inode);
}
else
rc = -ENOENT;
}
SMFS_POST_HOOK(dir, HOOK_SYMLINK, &msg, rc);
post_smfs_inode(dir, cache_dir);
smfs_trans_commit(dir, handle, 0);
exit:
post_smfs_dentry(cache_dentry);
post_smfs_dentry(cache_parent);
RETURN(rc);
}
static int smfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
{
struct inode *cache_dir = I2CI(dir);
struct inode *parent = I2CI(dentry->d_parent->d_inode);
struct inode *inode = NULL;
struct dentry *cache_dentry = NULL;
struct dentry *cache_parent = NULL;
void *handle = NULL;
int rc = 0;
struct hook_msg msg = {
.dentry = dentry,
};
ENTRY;
LASSERT(cache_dir);
LASSERT(parent);
cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
if (!cache_parent || !cache_dentry) {
rc = -ENOMEM;
goto exit;
}
handle = smfs_trans_start(dir, FSFILT_OP_MKDIR, NULL);
if (IS_ERR(handle)) {
rc = -ENOSPC;
goto exit;
}
pre_smfs_inode(dir, cache_dir);
SMFS_PRE_HOOK(dir, HOOK_MKDIR, &msg);
rc = cache_dir->i_op->mkdir(cache_dir, cache_dentry, mode);
if (!rc) {
inode = smfs_get_inode(dir->i_sb, cache_dentry->d_inode->i_ino,
dir, 0);
if (inode) {
//smsf_update_dentry(dentry, cache_dentry);
d_instantiate(dentry, inode);
}
else
rc = -ENOENT;
}
SMFS_POST_HOOK(dir, HOOK_MKDIR, &msg, rc);
post_smfs_inode(dir, cache_dir);
smfs_trans_commit(dir, handle, 0);
exit: post_smfs_dentry(cache_dentry);
post_smfs_dentry(cache_parent);
RETURN(rc);
}
static int smfs_rmdir(struct inode *dir, struct dentry *dentry)
{
struct inode *cache_dir = I2CI(dir);
struct inode *cache_inode = I2CI(dentry->d_inode);
struct inode *parent = I2CI(dentry->d_parent->d_inode);
struct dentry *cache_dentry = NULL;
struct dentry *cache_parent = NULL;
void *handle = NULL;
int rc = 0;
struct hook_unlink_msg msg = {
.dentry = dentry,
.mode = S_IFDIR
};
ENTRY;
LASSERT(cache_dir);
LASSERT(cache_dir->i_op->rmdir);
LASSERT(parent);
cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
cache_dentry = pre_smfs_dentry(cache_parent, cache_inode, dentry);
if (!cache_parent || !cache_dentry) {
rc = -ENOMEM;
goto exit;
}
handle = smfs_trans_start(dir, FSFILT_OP_RMDIR, NULL);
if (IS_ERR(handle) ) {
rc = -ENOSPC;
goto exit;
}
pre_smfs_inode(dir, cache_dir);
pre_smfs_inode(dentry->d_inode, cache_dentry->d_inode);
SMFS_PRE_HOOK(dir, HOOK_RMDIR, &msg);
rc = cache_dir->i_op->rmdir(cache_dir, cache_dentry);
SMFS_POST_HOOK(dir, HOOK_RMDIR, &msg, rc);
post_smfs_inode(dir, cache_dir);
post_smfs_inode(dentry->d_inode, cache_dentry->d_inode);
//like vfs_rmdir is doing with inode
if (!rc)
cache_dentry->d_inode->i_flags |= S_DEAD;
smfs_trans_commit(dir, handle, 0);
exit:
post_smfs_dentry(cache_dentry);
post_smfs_dentry(cache_parent);
RETURN(rc);
}
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
static int smfs_mknod(struct inode *dir, struct dentry *dentry,
int mode, int rdev)
#else
static int smfs_mknod(struct inode *dir, struct dentry *dentry,
int mode, dev_t rdev)
#endif
{
struct inode *cache_dir = I2CI(dir); struct inode *inode = NULL;
struct inode *parent = I2CI(dentry->d_parent->d_inode);
struct dentry *cache_dentry = NULL;
struct dentry *cache_parent = NULL;
void *handle = NULL;
int rc = 0;
struct hook_msg msg = {
.dentry = dentry,
};
ENTRY;
LASSERT(parent);
LASSERT(cache_dir);
LASSERT(cache_dir->i_op->mknod);
cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
if (!cache_parent || !cache_dentry) {
rc = -ENOMEM;
goto exit;
}
handle = smfs_trans_start(dir, FSFILT_OP_MKNOD, NULL);
if (IS_ERR(handle)) {
rc = -ENOSPC;
goto exit;
}
pre_smfs_inode(dir, cache_dir);
SMFS_PRE_HOOK(dir, HOOK_MKNOD, &msg);
rc = cache_dir->i_op->mknod(cache_dir, cache_dentry, mode, rdev);
if (!rc) {
inode = smfs_get_inode(dir->i_sb, cache_dentry->d_inode->i_ino,
dir, 0);
if (inode) {
//smsf_update_dentry(dentry, cache_dentry);
d_instantiate(dentry, inode);
}
else
rc = -ENOENT;
}
SMFS_POST_HOOK(dir, HOOK_MKNOD, &msg, rc);
post_smfs_inode(dir, cache_dir);
smfs_trans_commit(dir, handle, 0);
exit:
post_smfs_dentry(cache_dentry);
post_smfs_dentry(cache_parent);
RETURN(rc);
}
static int smfs_rename(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir,struct dentry *new_dentry)
{
struct inode *cache_old_dir = I2CI(old_dir);
struct inode *cache_new_dir = I2CI(new_dir);
struct inode *cache_old_inode = I2CI(old_dentry->d_inode);
struct inode *old_parent = I2CI(old_dentry->d_parent->d_inode);
struct inode *new_parent = I2CI(new_dentry->d_parent->d_inode);
struct inode *cache_new_inode = NULL;
struct dentry *cache_old_dentry = NULL;
struct dentry *cache_new_dentry = NULL;
struct dentry *cache_new_parent = NULL;
struct dentry *cache_old_parent = NULL; void *handle = NULL;
int rc = 0;
struct hook_rename_msg msg = {
.dentry = old_dentry,
.new_dir = new_dir,
.new_dentry = new_dentry
};
ENTRY;
if (!cache_old_dir || !cache_new_dir || !cache_old_inode)
RETURN(-ENOENT);
if (new_dentry->d_inode) {
cache_new_inode = I2CI(new_dentry->d_inode);
if (!cache_new_inode)
RETURN(-ENOENT);
}
cache_old_parent = pre_smfs_dentry(NULL, old_parent, old_dentry->d_parent);
cache_old_dentry = pre_smfs_dentry(cache_old_parent, cache_old_inode,
old_dentry);
if (!cache_old_parent || !cache_old_dentry) {
rc = -ENOMEM;
goto exit;
}
cache_new_parent = pre_smfs_dentry(NULL, new_parent, new_dentry->d_parent);
cache_new_dentry = pre_smfs_dentry(cache_new_parent, cache_new_inode,
new_dentry);
if (!cache_new_parent || !cache_new_dentry) {
rc = -ENOMEM;
goto exit;
}
handle = smfs_trans_start(old_dir, FSFILT_OP_RENAME, NULL);
if (IS_ERR(handle)) {
rc = -ENOSPC;
goto exit;
}
pre_smfs_inode(old_dir, cache_old_dir);
pre_smfs_inode(new_dir, cache_new_dir);
if (new_dentry->d_inode)
pre_smfs_inode(new_dentry->d_inode, cache_new_dentry->d_inode);
SMFS_PRE_HOOK(old_dir, HOOK_RENAME, &msg);
rc = cache_old_dir->i_op->rename(cache_old_dir, cache_old_dentry,
cache_new_dir, cache_new_dentry);
SMFS_POST_HOOK(old_dir, HOOK_RENAME, &msg, rc);
post_smfs_inode(old_dir, cache_old_dir);
post_smfs_inode(new_dir, cache_new_dir);
if (new_dentry->d_inode)
post_smfs_inode(new_dentry->d_inode, cache_new_dentry->d_inode);
smfs_trans_commit(old_dir, handle, 0);
exit:
post_smfs_dentry(cache_old_dentry);
post_smfs_dentry(cache_old_parent);
post_smfs_dentry(cache_new_dentry);
post_smfs_dentry(cache_new_parent);
RETURN(rc);
}
struct inode_operations smfs_dir_iops = {
create: smfs_create, lookup: smfs_lookup,
lookup_raw: smfs_lookup_raw,
link: smfs_link, /* BKL held */
unlink: smfs_unlink, /* BKL held */
symlink: smfs_symlink, /* BKL held */
mkdir: smfs_mkdir, /* BKL held */
rmdir: smfs_rmdir, /* BKL held */
mknod: smfs_mknod, /* BKL held */
rename: smfs_rename, /* BKL held */
setxattr: smfs_setxattr, /* BKL held */
getxattr: smfs_getxattr, /* BKL held */
listxattr: smfs_listxattr, /* BKL held */
removexattr: smfs_removexattr, /* BKL held */
};
struct inode_operations smfs_iopen_iops = {
lookup: smfs_iopen_lookup,
};
static ssize_t smfs_read_dir(struct file *filp, char *buf,
size_t size, loff_t *ppos)
{
struct dentry *dentry = filp->f_dentry;
struct inode *cache_inode = NULL;
struct smfs_file_info *sfi = NULL;
loff_t tmp_ppos;
loff_t *cache_ppos = NULL;
int rc = 0;
ENTRY;
cache_inode = I2CI(dentry->d_inode);
if (!cache_inode || !cache_inode->i_fop->read)
RETURN(-EINVAL);
sfi = F2SMFI(filp);
if (sfi->magic != SMFS_FILE_MAGIC)
BUG();
if (ppos != &(filp->f_pos))
cache_ppos = &tmp_ppos;
else
cache_ppos = &sfi->c_file->f_pos;
*cache_ppos = *ppos;
rc = cache_inode->i_fop->read(sfi->c_file, buf, size, cache_ppos);
if (rc)
RETURN(rc);
*ppos = *cache_ppos;
duplicate_file(filp, sfi->c_file);
RETURN(rc);
}
static int smfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
{
struct dentry *dentry = filp->f_dentry;
struct inode *cache_inode = NULL;
struct smfs_file_info *sfi = NULL;
int rc = 0;
struct hook_readdir_msg msg = {
.dentry = dentry,
.filp = filp,
.dirent = dirent,
.filldir = filldir
};
ENTRY;
cache_inode = I2CI(dentry->d_inode);
if (!cache_inode || !cache_inode->i_fop->readdir)
RETURN(-EINVAL);
sfi = F2SMFI(filp);
if (sfi->magic != SMFS_FILE_MAGIC) BUG();
SMFS_PRE_HOOK(dentry->d_inode, HOOK_READDIR, &msg);
rc = cache_inode->i_fop->readdir(sfi->c_file, dirent, filldir);
SMFS_POST_HOOK(dentry->d_inode, HOOK_READDIR, &msg, rc);
duplicate_file(filp, sfi->c_file);
RETURN(rc);
}
struct file_operations smfs_dir_fops = {
.read = smfs_read_dir,
.readdir = smfs_readdir, /* BKL held */
.ioctl = smfs_ioctl, /* BKL held */
.fsync = smfs_fsync, /* BKL held */
.open = smfs_open,
.release = smfs_release,
};
struct file_operations smfs_iopen_fops = {
.read = smfs_read_dir,
};