ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
{
struct inode *inode = d_inode(dentry);
struct f2fs_xattr_entry *entry;
void *base_addr;
int error = 0;
size_t rest = buffer_size;
down_read(&F2FS_I(inode)->i_xattr_sem);
error = read_all_xattrs(inode, NULL, &base_addr);
up_read(&F2FS_I(inode)->i_xattr_sem);
if (error)
return error;
list_for_each_xattr(entry, base_addr) {
const struct xattr_handler *handler =
f2fs_xattr_handler(entry->e_name_index);
const char *prefix;
size_t prefix_len;
size_t size;
if (!handler || (handler->list && !handler->list(dentry)))
continue;
prefix = handler->prefix ?: handler->name;
prefix_len = strlen(prefix);
size = prefix_len + entry->e_name_len + 1;
if (buffer) {
if (size > rest) {
error = -ERANGE;
goto cleanup;
}
memcpy(buffer, prefix, prefix_len);
buffer += prefix_len;
memcpy(buffer, entry->e_name, entry->e_name_len);
buffer += entry->e_name_len;
*buffer++ = 0;
}
rest -= size;
}
error = buffer_size - rest;
cleanup:
kzfree(base_addr);
return error;
}
int f2fs_getxattr(struct inode *inode, int index, const char *name,
void *buffer, size_t buffer_size, struct page *ipage)
{
struct f2fs_xattr_entry *entry;
void *base_addr;
int error = 0;
size_t size, len;
if (name == NULL)
return -EINVAL;
len = strlen(name);
if (len > F2FS_NAME_LEN)
return -ERANGE;
base_addr = read_all_xattrs(inode, ipage);
if (!base_addr)
return -ENOMEM;
entry = __find_xattr(base_addr, index, len, name);
if (IS_XATTR_LAST_ENTRY(entry)) {
error = -ENODATA;
goto cleanup;
}
size = le16_to_cpu(entry->e_value_size);
if (buffer && size > buffer_size) {
error = -ERANGE;
goto cleanup;
}
if (buffer) {
char *pval = entry->e_name + entry->e_name_len;
memcpy(buffer, pval, size);
}
error = size;
cleanup:
kzfree(base_addr);
return error;
}
ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
{
struct inode *inode = d_inode(dentry);
struct f2fs_xattr_entry *entry;
void *base_addr;
int error = 0;
size_t rest = buffer_size;
base_addr = read_all_xattrs(inode, NULL);
if (!base_addr)
return -ENOMEM;
list_for_each_xattr(entry, base_addr) {
const struct xattr_handler *handler =
f2fs_xattr_handler(entry->e_name_index);
size_t size;
if (!handler)
continue;
size = handler->list(dentry, buffer, rest, entry->e_name,
entry->e_name_len, handler->flags);
if (buffer && size > rest) {
error = -ERANGE;
goto cleanup;
}
if (buffer)
buffer += size;
rest -= size;
}
error = buffer_size - rest;
cleanup:
kzfree(base_addr);
return error;
}
static int __f2fs_setxattr(struct inode *inode, int index,
const char *name, const void *value, size_t size,
struct page *ipage, int flags)
{
struct f2fs_xattr_entry *here, *last;
void *base_addr;
int found, newsize;
size_t len;
__u32 new_hsize;
int error = 0;
if (name == NULL)
return -EINVAL;
if (value == NULL)
size = 0;
len = strlen(name);
if (len > F2FS_NAME_LEN)
return -ERANGE;
if (size > MAX_VALUE_LEN(inode))
return -E2BIG;
base_addr = read_all_xattrs(inode, ipage);
if (!base_addr)
return -ENOMEM;
/* find entry with wanted name. */
here = __find_xattr(base_addr, index, len, name);
found = IS_XATTR_LAST_ENTRY(here) ? 0 : 1;
if ((flags & XATTR_REPLACE) && !found) {
error = -ENODATA;
goto exit;
} else if ((flags & XATTR_CREATE) && found) {
error = -EEXIST;
goto exit;
}
last = here;
while (!IS_XATTR_LAST_ENTRY(last))
last = XATTR_NEXT_ENTRY(last);
newsize = XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) + len + size);
/* 1. Check space */
if (value) {
int free;
/*
* If value is NULL, it is remove operation.
* In case of update operation, we calculate free.
*/
free = MIN_OFFSET(inode) - ((char *)last - (char *)base_addr);
if (found)
free = free + ENTRY_SIZE(here);
if (unlikely(free < newsize)) {
error = -E2BIG;
goto exit;
}
}
/* 2. Remove old entry */
if (found) {
/*
* If entry is found, remove old entry.
* If not found, remove operation is not needed.
*/
struct f2fs_xattr_entry *next = XATTR_NEXT_ENTRY(here);
int oldsize = ENTRY_SIZE(here);
memmove(here, next, (char *)last - (char *)next);
last = (struct f2fs_xattr_entry *)((char *)last - oldsize);
memset(last, 0, oldsize);
}
new_hsize = (char *)last - (char *)base_addr;
/* 3. Write new entry */
if (value) {
char *pval;
/*
* Before we come here, old entry is removed.
* We just write new entry.
*/
last->e_name_index = index;
last->e_name_len = len;
memcpy(last->e_name, name, len);
pval = last->e_name + len;
memcpy(pval, value, size);
last->e_value_size = cpu_to_le16(size);
new_hsize += newsize;
}
error = write_all_xattrs(inode, new_hsize, base_addr, ipage);
if (error)
goto exit;
if (is_inode_flag_set(inode, FI_ACL_MODE)) {
inode->i_mode = F2FS_I(inode)->i_acl_mode;
inode->i_ctime = CURRENT_TIME;
clear_inode_flag(inode, FI_ACL_MODE);
}
if (index == F2FS_XATTR_INDEX_ENCRYPTION &&
!strcmp(name, F2FS_XATTR_NAME_ENCRYPTION_CONTEXT))
f2fs_set_encrypted_inode(inode);
f2fs_mark_inode_dirty_sync(inode);
exit:
kzfree(base_addr);
return error;
}
static int __f2fs_setxattr(struct inode *inode, int name_index,
const char *name, const void *value, size_t value_len,
struct page *ipage)
{
struct f2fs_inode_info *fi = F2FS_I(inode);
struct f2fs_xattr_entry *here, *last;
void *base_addr;
int found, newsize;
size_t name_len;
__u32 new_hsize;
int error = -ENOMEM;
if (name == NULL)
return -EINVAL;
if (value == NULL)
value_len = 0;
name_len = strlen(name);
if (name_len > F2FS_NAME_LEN || value_len > MAX_VALUE_LEN(inode))
return -ERANGE;
base_addr = read_all_xattrs(inode, ipage);
if (!base_addr)
goto exit;
/* find entry with wanted name. */
here = __find_xattr(base_addr, name_index, name_len, name);
found = IS_XATTR_LAST_ENTRY(here) ? 0 : 1;
last = here;
while (!IS_XATTR_LAST_ENTRY(last))
last = XATTR_NEXT_ENTRY(last);
newsize = XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) +
name_len + value_len);
/* 1. Check space */
if (value) {
int free;
/*
* If value is NULL, it is remove operation.
* In case of update operation, we caculate free.
*/
free = MIN_OFFSET(inode) - ((char *)last - (char *)base_addr);
if (found)
free = free + ENTRY_SIZE(here);
if (unlikely(free < newsize)) {
error = -ENOSPC;
goto exit;
}
}
/* 2. Remove old entry */
if (found) {
/*
* If entry is found, remove old entry.
* If not found, remove operation is not needed.
*/
struct f2fs_xattr_entry *next = XATTR_NEXT_ENTRY(here);
int oldsize = ENTRY_SIZE(here);
memmove(here, next, (char *)last - (char *)next);
last = (struct f2fs_xattr_entry *)((char *)last - oldsize);
memset(last, 0, oldsize);
}
new_hsize = (char *)last - (char *)base_addr;
/* 3. Write new entry */
if (value) {
char *pval;
/*
* Before we come here, old entry is removed.
* We just write new entry.
*/
memset(last, 0, newsize);
last->e_name_index = name_index;
last->e_name_len = name_len;
memcpy(last->e_name, name, name_len);
pval = last->e_name + name_len;
memcpy(pval, value, value_len);
last->e_value_size = cpu_to_le16(value_len);
new_hsize += newsize;
}
error = write_all_xattrs(inode, new_hsize, base_addr, ipage);
if (error)
goto exit;
if (is_inode_flag_set(fi, FI_ACL_MODE)) {
inode->i_mode = fi->i_acl_mode;
inode->i_ctime = CURRENT_TIME;
clear_inode_flag(fi, FI_ACL_MODE);
}
if (ipage)
update_inode(inode, ipage);
else
update_inode_page(inode);
exit:
kzfree(base_addr);
return error;
}