static int
lofs_fsync(struct file *file, struct dentry *dentry, int datasync)
{
int rc = -EINVAL;
struct file *lower_file = lofs_file_to_lower(file);
struct dentry *lower_dentry = lofs_dentry_to_lower(dentry);
struct inode *lower_inode = lower_dentry->d_inode;
if (lower_file->f_op && lower_file->f_op->fsync) {
LOCK_INODE(lower_inode);
rc = lower_file->f_op->fsync(lower_file, lower_dentry, datasync);
UNLOCK_INODE(lower_inode);
}
return rc;
}
/*
* Create no-name-pipeline.
*/
BOOL sys_pipe(struct pipe_rw_desc * p_rw)
{
struct m_inode * p;
struct pipe_rw_desc tmp;
if(!p_rw) {
k_printf("pipe: pipe-structure is NULL.");
return FALSE;
}
/* 分配索引节点和文件表项，失败则退回 */
if(!(p=ialloc(0)))
goto pipe_false_ret_1;
if(-1 == (tmp.rdesc = find_file_table(p, O_RONLY)))
goto pipe_false_ret_2;
if(-1 == (tmp.wdesc = find_file_table(p, O_WONLY)))
goto pipe_false_ret_3;
/*
* 对于管道文件，我们将其内存节点引用计数设置为2。
* 实际上这是修改，因为在iget()中，我们已经设置过了。
*/
p->count = 2;
/*
* 将索引节点解锁。注意再次使用时，要先加锁，使用完解锁。
*/
UNLOCK_INODE(p);
ds2fs_memcpy(p_rw, &tmp, sizeof(struct pipe_rw_desc));
return TRUE;
pipe_false_ret_3:
current->file[tmp.rdesc]->count = 0;
current->file[tmp.rdesc] = NULL;
pipe_false_ret_2:
ifree(p->dev, p->nrinode);
iput(p);
pipe_false_ret_1:
tmp.rdesc = -1;
tmp.wdesc = -1;
ds2fs_memcpy(p_rw, &tmp, sizeof(struct pipe_rw_desc));
return FALSE;
}
extern ssize_t
vnode_shadow_iop_listxattr(
struct dentry *dentry,
char *name,
size_t size
)
{
DENT_T *rdent;
VNODE_T *cvp;
ssize_t rsize;
#if defined(RATL_SUSE)
LOCK_INODE(dentry->d_inode);
#endif
rdent = REALDENTRY_LOCKED(dentry, &cvp);
rsize = vnlayer_do_listxattr(rdent, name, size);
REALDENTRY_UNLOCK(dentry, cvp);
#if defined(RATL_SUSE)
UNLOCK_INODE(dentry->d_inode);
#endif
return rsize;
}
/* This is really VOP_SETATTR() in sheep's clothing */
int
vnode_iop_notify_change(
DENT_T *dent_p,
struct iattr * iattr_p
)
{
VNODE_T *vp;
VATTR_T *vap;
VNODE_T *cvp;
int err = 0;
DENT_T *rdent;
CALL_DATA_T cd;
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36)
mdki_boolean_t tooksem = FALSE;
#endif
if (iattr_p->ia_valid & ATTR_SIZE) {
ASSERT_I_SEM_MINE(dent_p->d_inode);
}
if (MDKI_INOISMVFS(dent_p->d_inode)) {
vap = VATTR_ALLOC();
if (vap != NULL) {
vnode_iop_iattr2vattr(iattr_p, vap);
/* reject attempts to use setattr to change object type */
vap->va_mask &= ~AT_TYPE;
mdki_linux_init_call_data(&cd);
vp = ITOV(dent_p->d_inode);
err = VOP_SETATTR(vp, vap, 0, &cd);
err = mdki_errno_unix_to_linux(err);
/* Any underlying cleartxt got its inode truncated via changeattr
* if there's a need to change its size.
*/
if (!err)
mdki_linux_vattr_pullup(vp, vap, vap->va_mask);
VATTR_FREE(vap);
mdki_linux_destroy_call_data(&cd);
} else {
err = -ENOMEM;
}
} else {
rdent = REALDENTRY_LOCKED(dent_p, &cvp);
VNODE_DGET(rdent);
if (rdent && rdent->d_inode) {
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36)
err = inode_setattr(dent_p->d_inode, iattr_p);
if (err == 0) {
if (iattr_p->ia_valid & ATTR_SIZE) {
LOCK_INODE(rdent->d_inode);
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,13)
#if !defined RHEL_UPDATE || RHEL_UPDATE < 5
down_write(&rdent->d_inode->i_alloc_sem);
#endif
#endif
/*
* be paranoid and record the 'taken'ness in case
* the called function squashes ia_valid (as is
* done in nfs_setattr).
*/
tooksem = TRUE;
}
err = MDKI_NOTIFY_CHANGE(rdent, CVN_TO_VFSMNT(cvp), iattr_p);
if (tooksem) {
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,13)
#if !defined(RHEL_UPDATE) || RHEL_UPDATE < 5
up_write(&rdent->d_inode->i_alloc_sem);
#endif
#endif
UNLOCK_INODE(rdent->d_inode);
}
}
#else /* LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36) */
err = simple_setattr(dent_p, iattr_p);
if (err == 0)
err = MDKI_NOTIFY_CHANGE(rdent, CVN_TO_VFSMNT(cvp), iattr_p);
#endif /* else LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36) */
} else {
/* It looks as though someone removed the realdentry on us.
* I am not sure why this should happen.
*/
err = -ENOENT;
}
if (rdent) {
VNODE_DPUT(rdent);
REALDENTRY_UNLOCK(dent_p, cvp);
}
}
return err;
}
/*
* 进程根目录和工作目录初始化。
*/
void proc_dir_init(unsigned char dev, unsigned int nrinode)
{
current->root_dir = current->current_dir = iget(dev, nrinode);
UNLOCK_INODE(current->root_dir); /* 解锁 */
}
