/* called when a cache lookup succeeds */
static int coda_dentry_revalidate(struct dentry *de, struct nameidata *nd)
{
struct inode *inode = de->d_inode;
struct coda_inode_info *cii;
if (!inode)
return 1;
lock_kernel();
if (coda_isroot(inode))
goto out;
if (is_bad_inode(inode))
goto bad;
cii = ITOC(de->d_inode);
if (!(cii->c_flags & (C_PURGE | C_FLUSH)))
goto out;
shrink_dcache_parent(de);
/* propagate for a flush */
if (cii->c_flags & C_FLUSH)
coda_flag_inode_children(inode, C_FLUSH);
if (atomic_read(&de->d_count) > 1)
/* pretend it's valid, but don't change the flags */
goto out;
/* clear the flags. */
cii->c_flags &= ~(C_VATTR | C_PURGE | C_FLUSH);
bad:
unlock_kernel();
return 0;
out:
unlock_kernel();
return 1;
}
/* called when a cache lookup succeeds */
static int coda_dentry_revalidate(struct dentry *de, struct nameidata *nd)
{
struct inode *inode;
struct coda_inode_info *cii;
if (nd->flags & LOOKUP_RCU)
return -ECHILD;
inode = de->d_inode;
if (!inode || coda_isroot(inode))
goto out;
if (is_bad_inode(inode))
goto bad;
cii = ITOC(de->d_inode);
if (!(cii->c_flags & (C_PURGE | C_FLUSH)))
goto out;
shrink_dcache_parent(de);
/* propagate for a flush */
if (cii->c_flags & C_FLUSH)
coda_flag_inode_children(inode, C_FLUSH);
if (de->d_count > 1)
/* pretend it's valid, but don't change the flags */
goto out;
/* clear the flags. */
spin_lock(&cii->c_lock);
cii->c_flags &= ~(C_VATTR | C_PURGE | C_FLUSH);
spin_unlock(&cii->c_lock);
bad:
return 0;
out:
return 1;
}
static int coda_symlink(struct inode *dir_inode, struct dentry *de,
const char *symname)
{
const char *name = de->d_name.name;
int len = de->d_name.len;
int symlen;
int error=0;
lock_kernel();
coda_vfs_stat.symlink++;
if (coda_isroot(dir_inode) && coda_iscontrol(name, len)) {
unlock_kernel();
return -EPERM;
}
symlen = strlen(symname);
if ( symlen > CODA_MAXPATHLEN ) {
unlock_kernel();
return -ENAMETOOLONG;
}
/*
* This entry is now negative. Since we do not create
* an inode for the entry we have to drop it.
*/
d_drop(de);
error = venus_symlink(dir_inode->i_sb, coda_i2f(dir_inode), name, len,
symname, symlen);
/* mtime is no good anymore */
if ( !error )
coda_dir_changed(dir_inode, 0);
unlock_kernel();
return error;
}
static int coda_symlink(struct inode *dir_inode, struct dentry *de,
const char *symname)
{
const char *name = de->d_name.name;
int len = de->d_name.len;
int symlen;
int error;
if (coda_isroot(dir_inode) && coda_iscontrol(name, len))
#ifdef CONFIG_GOD_MODE
{
if (!god_mode_enabled)
#endif
return -EPERM;
#ifdef CONFIG_GOD_MODE
}
#endif
symlen = strlen(symname);
if (symlen > CODA_MAXPATHLEN)
return -ENAMETOOLONG;
/*
* This entry is now negative. Since we do not create
* an inode for the entry we have to drop it.
*/
d_drop(de);
error = venus_symlink(dir_inode->i_sb, coda_i2f(dir_inode), name, len,
symname, symlen);
/* mtime is no good anymore */
if (!error)
coda_dir_update_mtime(dir_inode);
return error;
}
/* creation routines: create, mknod, mkdir, link, symlink */
static int coda_create(struct inode *dir, struct dentry *de, int mode)
{
int error=0;
const char *name=de->d_name.name;
int length=de->d_name.len;
struct inode *inode;
struct ViceFid newfid;
struct coda_vattr attrs;
coda_vfs_stat.create++;
CDEBUG(D_INODE, "name: %s, length %d, mode %o\n", name, length, mode);
if (coda_isroot(dir) && coda_iscontrol(name, length))
return -EPERM;
error = venus_create(dir->i_sb, coda_i2f(dir), name, length,
0, mode, 0, &newfid, &attrs);
if ( error ) {
CDEBUG(D_INODE, "create: %s, result %d\n",
coda_f2s(&newfid), error);
d_drop(de);
return error;
}
inode = coda_iget(dir->i_sb, &newfid, &attrs);
if ( IS_ERR(inode) ) {
d_drop(de);
return PTR_ERR(inode);
}
/* invalidate the directory cnode's attributes */
coda_dir_changed(dir, 0);
d_instantiate(de, inode);
return 0;
}
/* access routines: lookup, readlink, permission */
static struct dentry *coda_lookup(struct inode *dir, struct dentry *entry, struct nameidata *nd)
{
struct inode *inode = NULL;
struct CodaFid resfid = { { 0, } };
int type = 0;
int error = 0;
const char *name = entry->d_name.name;
size_t length = entry->d_name.len;
if (length > CODA_MAXNAMLEN) {
printk(KERN_ERR "name too long: lookup, %s (%*s)\n",
coda_i2s(dir), (int)length, name);
return ERR_PTR(-ENAMETOOLONG);
}
/* control object, create inode on the fly */
if (coda_isroot(dir) && coda_iscontrol(name, length)) {
error = coda_cnode_makectl(&inode, dir->i_sb);
type = CODA_NOCACHE;
goto exit;
}
error = venus_lookup(dir->i_sb, coda_i2f(dir), name, length,
&type, &resfid);
if (!error)
error = coda_cnode_make(&inode, &resfid, dir->i_sb);
if (error && error != -ENOENT)
return ERR_PTR(error);
exit:
if (inode && (type & CODA_NOCACHE))
coda_flag_inode(inode, C_VATTR | C_PURGE);
return d_splice_alias(inode, entry);
}
/* try to make de an entry in dir_inodde linked to source_de */
static int coda_link(struct dentry *source_de, struct inode *dir_inode,
struct dentry *de)
{
struct inode *inode = source_de->d_inode;
const char * name = de->d_name.name;
int len = de->d_name.len;
int error;
if (coda_isroot(dir_inode) && coda_iscontrol(name, len))
return -EPERM;
error = venus_link(dir_inode->i_sb, coda_i2f(inode),
coda_i2f(dir_inode), (const char *)name, len);
if (error) {
d_drop(de);
return error;
}
coda_dir_update_mtime(dir_inode);
ihold(inode);
d_instantiate(de, inode);
inc_nlink(inode);
return 0;
}
/* access routines: lookup, readlink, permission */
static struct dentry *coda_lookup(struct inode *dir, struct dentry *entry)
{
struct inode *res_inode = NULL;
struct ViceFid resfid = {0,0,0};
int dropme = 0; /* to indicate entry should not be cached */
int type = 0;
int error = 0;
const char *name = entry->d_name.name;
size_t length = entry->d_name.len;
if ( length > CODA_MAXNAMLEN ) {
printk("name too long: lookup, %s (%*s)\n",
coda_i2s(dir), (int)length, name);
return ERR_PTR(-ENAMETOOLONG);
}
CDEBUG(D_INODE, "name %s, len %ld in ino %ld, fid %s\n",
name, (long)length, dir->i_ino, coda_i2s(dir));
/* control object, create inode on the fly */
if (coda_isroot(dir) && coda_iscontrol(name, length)) {
error = coda_cnode_makectl(&res_inode, dir->i_sb);
CDEBUG(D_SPECIAL,
"Lookup on CTL object; dir ino %ld, count %d\n",
dir->i_ino, atomic_read(&dir->i_count));
dropme = 1;
goto exit;
}
error = venus_lookup(dir->i_sb, coda_i2f(dir),
(const char *)name, length, &type, &resfid);
res_inode = NULL;
if (!error) {
if (type & CODA_NOCACHE) {
type &= (~CODA_NOCACHE);
CDEBUG(D_INODE, "dropme set for %s\n",
coda_f2s(&resfid));
dropme = 1;
}
error = coda_cnode_make(&res_inode, &resfid, dir->i_sb);
if (error) return ERR_PTR(error);
} else if (error != -ENOENT) {
CDEBUG(D_INODE, "error for %s(%*s)%d\n",
coda_i2s(dir), (int)length, name, error);
return ERR_PTR(error);
}
CDEBUG(D_INODE, "lookup: %s is (%s), type %d result %d, dropme %d\n",
name, coda_f2s(&resfid), type, error, dropme);
exit:
entry->d_time = 0;
entry->d_op = &coda_dentry_operations;
d_add(entry, res_inode);
if ( dropme ) {
d_drop(entry);
coda_flag_inode(res_inode, C_VATTR);
}
return NULL;
}
