linux/fs/ext4/inline.c
Theodore Ts'o 56a04915df ext4 crypto: simplify interfaces to directory entry insert functions
A number of functions include ext4_add_dx_entry, make_indexed_dir,
etc. are being passed a dentry even though the only thing they use is
the containing parent.  We can shrink the code size slightly by making
this replacement.  This will also be useful in cases where we don't
have a dentry as the argument to the directory entry insert functions.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2016-01-08 16:00:31 -05:00

2021 lines
49 KiB
C

/*
* Copyright (c) 2012 Taobao.
* Written by Tao Ma <boyu.mt@taobao.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2.1 of the GNU Lesser General Public License
* as published by the Free Software Foundation.
*
* This program 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.
*/
#include <linux/fiemap.h>
#include "ext4_jbd2.h"
#include "ext4.h"
#include "xattr.h"
#include "truncate.h"
#define EXT4_XATTR_SYSTEM_DATA "data"
#define EXT4_MIN_INLINE_DATA_SIZE ((sizeof(__le32) * EXT4_N_BLOCKS))
#define EXT4_INLINE_DOTDOT_OFFSET 2
#define EXT4_INLINE_DOTDOT_SIZE 4
static int ext4_get_inline_size(struct inode *inode)
{
if (EXT4_I(inode)->i_inline_off)
return EXT4_I(inode)->i_inline_size;
return 0;
}
static int get_max_inline_xattr_value_size(struct inode *inode,
struct ext4_iloc *iloc)
{
struct ext4_xattr_ibody_header *header;
struct ext4_xattr_entry *entry;
struct ext4_inode *raw_inode;
int free, min_offs;
min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
EXT4_GOOD_OLD_INODE_SIZE -
EXT4_I(inode)->i_extra_isize -
sizeof(struct ext4_xattr_ibody_header);
/*
* We need to subtract another sizeof(__u32) since an in-inode xattr
* needs an empty 4 bytes to indicate the gap between the xattr entry
* and the name/value pair.
*/
if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
return EXT4_XATTR_SIZE(min_offs -
EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
EXT4_XATTR_ROUND - sizeof(__u32));
raw_inode = ext4_raw_inode(iloc);
header = IHDR(inode, raw_inode);
entry = IFIRST(header);
/* Compute min_offs. */
for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) {
if (!entry->e_value_block && entry->e_value_size) {
size_t offs = le16_to_cpu(entry->e_value_offs);
if (offs < min_offs)
min_offs = offs;
}
}
free = min_offs -
((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
if (EXT4_I(inode)->i_inline_off) {
entry = (struct ext4_xattr_entry *)
((void *)raw_inode + EXT4_I(inode)->i_inline_off);
free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
goto out;
}
free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
if (free > EXT4_XATTR_ROUND)
free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
else
free = 0;
out:
return free;
}
/*
* Get the maximum size we now can store in an inode.
* If we can't find the space for a xattr entry, don't use the space
* of the extents since we have no space to indicate the inline data.
*/
int ext4_get_max_inline_size(struct inode *inode)
{
int error, max_inline_size;
struct ext4_iloc iloc;
if (EXT4_I(inode)->i_extra_isize == 0)
return 0;
error = ext4_get_inode_loc(inode, &iloc);
if (error) {
ext4_error_inode(inode, __func__, __LINE__, 0,
"can't get inode location %lu",
inode->i_ino);
return 0;
}
down_read(&EXT4_I(inode)->xattr_sem);
max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
up_read(&EXT4_I(inode)->xattr_sem);
brelse(iloc.bh);
if (!max_inline_size)
return 0;
return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
}
/*
* this function does not take xattr_sem, which is OK because it is
* currently only used in a code path coming form ext4_iget, before
* the new inode has been unlocked
*/
int ext4_find_inline_data_nolock(struct inode *inode)
{
struct ext4_xattr_ibody_find is = {
.s = { .not_found = -ENODATA, },
};
struct ext4_xattr_info i = {
.name_index = EXT4_XATTR_INDEX_SYSTEM,
.name = EXT4_XATTR_SYSTEM_DATA,
};
int error;
if (EXT4_I(inode)->i_extra_isize == 0)
return 0;
error = ext4_get_inode_loc(inode, &is.iloc);
if (error)
return error;
error = ext4_xattr_ibody_find(inode, &i, &is);
if (error)
goto out;
if (!is.s.not_found) {
EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
(void *)ext4_raw_inode(&is.iloc));
EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
le32_to_cpu(is.s.here->e_value_size);
ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
}
out:
brelse(is.iloc.bh);
return error;
}
static int ext4_read_inline_data(struct inode *inode, void *buffer,
unsigned int len,
struct ext4_iloc *iloc)
{
struct ext4_xattr_entry *entry;
struct ext4_xattr_ibody_header *header;
int cp_len = 0;
struct ext4_inode *raw_inode;
if (!len)
return 0;
BUG_ON(len > EXT4_I(inode)->i_inline_size);
cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ?
len : EXT4_MIN_INLINE_DATA_SIZE;
raw_inode = ext4_raw_inode(iloc);
memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
len -= cp_len;
buffer += cp_len;
if (!len)
goto out;
header = IHDR(inode, raw_inode);
entry = (struct ext4_xattr_entry *)((void *)raw_inode +
EXT4_I(inode)->i_inline_off);
len = min_t(unsigned int, len,
(unsigned int)le32_to_cpu(entry->e_value_size));
memcpy(buffer,
(void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
cp_len += len;
out:
return cp_len;
}
/*
* write the buffer to the inline inode.
* If 'create' is set, we don't need to do the extra copy in the xattr
* value since it is already handled by ext4_xattr_ibody_inline_set.
* That saves us one memcpy.
*/
static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
void *buffer, loff_t pos, unsigned int len)
{
struct ext4_xattr_entry *entry;
struct ext4_xattr_ibody_header *header;
struct ext4_inode *raw_inode;
int cp_len = 0;
BUG_ON(!EXT4_I(inode)->i_inline_off);
BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
raw_inode = ext4_raw_inode(iloc);
buffer += pos;
if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
EXT4_MIN_INLINE_DATA_SIZE - pos : len;
memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
len -= cp_len;
buffer += cp_len;
pos += cp_len;
}
if (!len)
return;
pos -= EXT4_MIN_INLINE_DATA_SIZE;
header = IHDR(inode, raw_inode);
entry = (struct ext4_xattr_entry *)((void *)raw_inode +
EXT4_I(inode)->i_inline_off);
memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
buffer, len);
}
static int ext4_create_inline_data(handle_t *handle,
struct inode *inode, unsigned len)
{
int error;
void *value = NULL;
struct ext4_xattr_ibody_find is = {
.s = { .not_found = -ENODATA, },
};
struct ext4_xattr_info i = {
.name_index = EXT4_XATTR_INDEX_SYSTEM,
.name = EXT4_XATTR_SYSTEM_DATA,
};
error = ext4_get_inode_loc(inode, &is.iloc);
if (error)
return error;
BUFFER_TRACE(is.iloc.bh, "get_write_access");
error = ext4_journal_get_write_access(handle, is.iloc.bh);
if (error)
goto out;
if (len > EXT4_MIN_INLINE_DATA_SIZE) {
value = EXT4_ZERO_XATTR_VALUE;
len -= EXT4_MIN_INLINE_DATA_SIZE;
} else {
value = "";
len = 0;
}
/* Insert the the xttr entry. */
i.value = value;
i.value_len = len;
error = ext4_xattr_ibody_find(inode, &i, &is);
if (error)
goto out;
BUG_ON(!is.s.not_found);
error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
if (error) {
if (error == -ENOSPC)
ext4_clear_inode_state(inode,
EXT4_STATE_MAY_INLINE_DATA);
goto out;
}
memset((void *)ext4_raw_inode(&is.iloc)->i_block,
0, EXT4_MIN_INLINE_DATA_SIZE);
EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
(void *)ext4_raw_inode(&is.iloc));
EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
get_bh(is.iloc.bh);
error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
out:
brelse(is.iloc.bh);
return error;
}
static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
unsigned int len)
{
int error;
void *value = NULL;
struct ext4_xattr_ibody_find is = {
.s = { .not_found = -ENODATA, },
};
struct ext4_xattr_info i = {
.name_index = EXT4_XATTR_INDEX_SYSTEM,
.name = EXT4_XATTR_SYSTEM_DATA,
};
/* If the old space is ok, write the data directly. */
if (len <= EXT4_I(inode)->i_inline_size)
return 0;
error = ext4_get_inode_loc(inode, &is.iloc);
if (error)
return error;
error = ext4_xattr_ibody_find(inode, &i, &is);
if (error)
goto out;
BUG_ON(is.s.not_found);
len -= EXT4_MIN_INLINE_DATA_SIZE;
value = kzalloc(len, GFP_NOFS);
if (!value)
goto out;
error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
value, len);
if (error == -ENODATA)
goto out;
BUFFER_TRACE(is.iloc.bh, "get_write_access");
error = ext4_journal_get_write_access(handle, is.iloc.bh);
if (error)
goto out;
/* Update the xttr entry. */
i.value = value;
i.value_len = len;
error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
if (error)
goto out;
EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
(void *)ext4_raw_inode(&is.iloc));
EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
le32_to_cpu(is.s.here->e_value_size);
ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
get_bh(is.iloc.bh);
error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
out:
kfree(value);
brelse(is.iloc.bh);
return error;
}
static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
unsigned int len)
{
int ret, size;
struct ext4_inode_info *ei = EXT4_I(inode);
if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
return -ENOSPC;
size = ext4_get_max_inline_size(inode);
if (size < len)
return -ENOSPC;
down_write(&EXT4_I(inode)->xattr_sem);
if (ei->i_inline_off)
ret = ext4_update_inline_data(handle, inode, len);
else
ret = ext4_create_inline_data(handle, inode, len);
up_write(&EXT4_I(inode)->xattr_sem);
return ret;
}
static int ext4_destroy_inline_data_nolock(handle_t *handle,
struct inode *inode)
{
struct ext4_inode_info *ei = EXT4_I(inode);
struct ext4_xattr_ibody_find is = {
.s = { .not_found = 0, },
};
struct ext4_xattr_info i = {
.name_index = EXT4_XATTR_INDEX_SYSTEM,
.name = EXT4_XATTR_SYSTEM_DATA,
.value = NULL,
.value_len = 0,
};
int error;
if (!ei->i_inline_off)
return 0;
error = ext4_get_inode_loc(inode, &is.iloc);
if (error)
return error;
error = ext4_xattr_ibody_find(inode, &i, &is);
if (error)
goto out;
BUFFER_TRACE(is.iloc.bh, "get_write_access");
error = ext4_journal_get_write_access(handle, is.iloc.bh);
if (error)
goto out;
error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
if (error)
goto out;
memset((void *)ext4_raw_inode(&is.iloc)->i_block,
0, EXT4_MIN_INLINE_DATA_SIZE);
if (ext4_has_feature_extents(inode->i_sb)) {
if (S_ISDIR(inode->i_mode) ||
S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
ext4_ext_tree_init(handle, inode);
}
}
ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
get_bh(is.iloc.bh);
error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
EXT4_I(inode)->i_inline_off = 0;
EXT4_I(inode)->i_inline_size = 0;
ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
out:
brelse(is.iloc.bh);
if (error == -ENODATA)
error = 0;
return error;
}
static int ext4_read_inline_page(struct inode *inode, struct page *page)
{
void *kaddr;
int ret = 0;
size_t len;
struct ext4_iloc iloc;
BUG_ON(!PageLocked(page));
BUG_ON(!ext4_has_inline_data(inode));
BUG_ON(page->index);
if (!EXT4_I(inode)->i_inline_off) {
ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
inode->i_ino);
goto out;
}
ret = ext4_get_inode_loc(inode, &iloc);
if (ret)
goto out;
len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
kaddr = kmap_atomic(page);
ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
flush_dcache_page(page);
kunmap_atomic(kaddr);
zero_user_segment(page, len, PAGE_CACHE_SIZE);
SetPageUptodate(page);
brelse(iloc.bh);
out:
return ret;
}
int ext4_readpage_inline(struct inode *inode, struct page *page)
{
int ret = 0;
down_read(&EXT4_I(inode)->xattr_sem);
if (!ext4_has_inline_data(inode)) {
up_read(&EXT4_I(inode)->xattr_sem);
return -EAGAIN;
}
/*
* Current inline data can only exist in the 1st page,
* So for all the other pages, just set them uptodate.
*/
if (!page->index)
ret = ext4_read_inline_page(inode, page);
else if (!PageUptodate(page)) {
zero_user_segment(page, 0, PAGE_CACHE_SIZE);
SetPageUptodate(page);
}
up_read(&EXT4_I(inode)->xattr_sem);
unlock_page(page);
return ret >= 0 ? 0 : ret;
}
static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
struct inode *inode,
unsigned flags)
{
int ret, needed_blocks;
handle_t *handle = NULL;
int retries = 0, sem_held = 0;
struct page *page = NULL;
unsigned from, to;
struct ext4_iloc iloc;
if (!ext4_has_inline_data(inode)) {
/*
* clear the flag so that no new write
* will trap here again.
*/
ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
return 0;
}
needed_blocks = ext4_writepage_trans_blocks(inode);
ret = ext4_get_inode_loc(inode, &iloc);
if (ret)
return ret;
retry:
handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
handle = NULL;
goto out;
}
/* We cannot recurse into the filesystem as the transaction is already
* started */
flags |= AOP_FLAG_NOFS;
page = grab_cache_page_write_begin(mapping, 0, flags);
if (!page) {
ret = -ENOMEM;
goto out;
}
down_write(&EXT4_I(inode)->xattr_sem);
sem_held = 1;
/* If some one has already done this for us, just exit. */
if (!ext4_has_inline_data(inode)) {
ret = 0;
goto out;
}
from = 0;
to = ext4_get_inline_size(inode);
if (!PageUptodate(page)) {
ret = ext4_read_inline_page(inode, page);
if (ret < 0)
goto out;
}
ret = ext4_destroy_inline_data_nolock(handle, inode);
if (ret)
goto out;
if (ext4_should_dioread_nolock(inode))
ret = __block_write_begin(page, from, to, ext4_get_block_write);
else
ret = __block_write_begin(page, from, to, ext4_get_block);
if (!ret && ext4_should_journal_data(inode)) {
ret = ext4_walk_page_buffers(handle, page_buffers(page),
from, to, NULL,
do_journal_get_write_access);
}
if (ret) {
unlock_page(page);
page_cache_release(page);
page = NULL;
ext4_orphan_add(handle, inode);
up_write(&EXT4_I(inode)->xattr_sem);
sem_held = 0;
ext4_journal_stop(handle);
handle = NULL;
ext4_truncate_failed_write(inode);
/*
* If truncate failed early the inode might
* still be on the orphan list; we need to
* make sure the inode is removed from the
* orphan list in that case.
*/
if (inode->i_nlink)
ext4_orphan_del(NULL, inode);
}
if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
goto retry;
if (page)
block_commit_write(page, from, to);
out:
if (page) {
unlock_page(page);
page_cache_release(page);
}
if (sem_held)
up_write(&EXT4_I(inode)->xattr_sem);
if (handle)
ext4_journal_stop(handle);
brelse(iloc.bh);
return ret;
}
/*
* Try to write data in the inode.
* If the inode has inline data, check whether the new write can be
* in the inode also. If not, create the page the handle, move the data
* to the page make it update and let the later codes create extent for it.
*/
int ext4_try_to_write_inline_data(struct address_space *mapping,
struct inode *inode,
loff_t pos, unsigned len,
unsigned flags,
struct page **pagep)
{
int ret;
handle_t *handle;
struct page *page;
struct ext4_iloc iloc;
if (pos + len > ext4_get_max_inline_size(inode))
goto convert;
ret = ext4_get_inode_loc(inode, &iloc);
if (ret)
return ret;
/*
* The possible write could happen in the inode,
* so try to reserve the space in inode first.
*/
handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
handle = NULL;
goto out;
}
ret = ext4_prepare_inline_data(handle, inode, pos + len);
if (ret && ret != -ENOSPC)
goto out;
/* We don't have space in inline inode, so convert it to extent. */
if (ret == -ENOSPC) {
ext4_journal_stop(handle);
brelse(iloc.bh);
goto convert;
}
flags |= AOP_FLAG_NOFS;
page = grab_cache_page_write_begin(mapping, 0, flags);
if (!page) {
ret = -ENOMEM;
goto out;
}
*pagep = page;
down_read(&EXT4_I(inode)->xattr_sem);
if (!ext4_has_inline_data(inode)) {
ret = 0;
unlock_page(page);
page_cache_release(page);
goto out_up_read;
}
if (!PageUptodate(page)) {
ret = ext4_read_inline_page(inode, page);
if (ret < 0)
goto out_up_read;
}
ret = 1;
handle = NULL;
out_up_read:
up_read(&EXT4_I(inode)->xattr_sem);
out:
if (handle)
ext4_journal_stop(handle);
brelse(iloc.bh);
return ret;
convert:
return ext4_convert_inline_data_to_extent(mapping,
inode, flags);
}
int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
unsigned copied, struct page *page)
{
int ret;
void *kaddr;
struct ext4_iloc iloc;
if (unlikely(copied < len)) {
if (!PageUptodate(page)) {
copied = 0;
goto out;
}
}
ret = ext4_get_inode_loc(inode, &iloc);
if (ret) {
ext4_std_error(inode->i_sb, ret);
copied = 0;
goto out;
}
down_write(&EXT4_I(inode)->xattr_sem);
BUG_ON(!ext4_has_inline_data(inode));
kaddr = kmap_atomic(page);
ext4_write_inline_data(inode, &iloc, kaddr, pos, len);
kunmap_atomic(kaddr);
SetPageUptodate(page);
/* clear page dirty so that writepages wouldn't work for us. */
ClearPageDirty(page);
up_write(&EXT4_I(inode)->xattr_sem);
brelse(iloc.bh);
out:
return copied;
}
struct buffer_head *
ext4_journalled_write_inline_data(struct inode *inode,
unsigned len,
struct page *page)
{
int ret;
void *kaddr;
struct ext4_iloc iloc;
ret = ext4_get_inode_loc(inode, &iloc);
if (ret) {
ext4_std_error(inode->i_sb, ret);
return NULL;
}
down_write(&EXT4_I(inode)->xattr_sem);
kaddr = kmap_atomic(page);
ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
kunmap_atomic(kaddr);
up_write(&EXT4_I(inode)->xattr_sem);
return iloc.bh;
}
/*
* Try to make the page cache and handle ready for the inline data case.
* We can call this function in 2 cases:
* 1. The inode is created and the first write exceeds inline size. We can
* clear the inode state safely.
* 2. The inode has inline data, then we need to read the data, make it
* update and dirty so that ext4_da_writepages can handle it. We don't
* need to start the journal since the file's metatdata isn't changed now.
*/
static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
struct inode *inode,
unsigned flags,
void **fsdata)
{
int ret = 0, inline_size;
struct page *page;
page = grab_cache_page_write_begin(mapping, 0, flags);
if (!page)
return -ENOMEM;
down_read(&EXT4_I(inode)->xattr_sem);
if (!ext4_has_inline_data(inode)) {
ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
goto out;
}
inline_size = ext4_get_inline_size(inode);
if (!PageUptodate(page)) {
ret = ext4_read_inline_page(inode, page);
if (ret < 0)
goto out;
}
ret = __block_write_begin(page, 0, inline_size,
ext4_da_get_block_prep);
if (ret) {
up_read(&EXT4_I(inode)->xattr_sem);
unlock_page(page);
page_cache_release(page);
ext4_truncate_failed_write(inode);
return ret;
}
SetPageDirty(page);
SetPageUptodate(page);
ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
*fsdata = (void *)CONVERT_INLINE_DATA;
out:
up_read(&EXT4_I(inode)->xattr_sem);
if (page) {
unlock_page(page);
page_cache_release(page);
}
return ret;
}
/*
* Prepare the write for the inline data.
* If the the data can be written into the inode, we just read
* the page and make it uptodate, and start the journal.
* Otherwise read the page, makes it dirty so that it can be
* handle in writepages(the i_disksize update is left to the
* normal ext4_da_write_end).
*/
int ext4_da_write_inline_data_begin(struct address_space *mapping,
struct inode *inode,
loff_t pos, unsigned len,
unsigned flags,
struct page **pagep,
void **fsdata)
{
int ret, inline_size;
handle_t *handle;
struct page *page;
struct ext4_iloc iloc;
int retries;
ret = ext4_get_inode_loc(inode, &iloc);
if (ret)
return ret;
retry_journal:
handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
goto out;
}
inline_size = ext4_get_max_inline_size(inode);
ret = -ENOSPC;
if (inline_size >= pos + len) {
ret = ext4_prepare_inline_data(handle, inode, pos + len);
if (ret && ret != -ENOSPC)
goto out_journal;
}
/*
* We cannot recurse into the filesystem as the transaction
* is already started.
*/
flags |= AOP_FLAG_NOFS;
if (ret == -ENOSPC) {
ret = ext4_da_convert_inline_data_to_extent(mapping,
inode,
flags,
fsdata);
ext4_journal_stop(handle);
if (ret == -ENOSPC &&
ext4_should_retry_alloc(inode->i_sb, &retries))
goto retry_journal;
goto out;
}
page = grab_cache_page_write_begin(mapping, 0, flags);
if (!page) {
ret = -ENOMEM;
goto out_journal;
}
down_read(&EXT4_I(inode)->xattr_sem);
if (!ext4_has_inline_data(inode)) {
ret = 0;
goto out_release_page;
}
if (!PageUptodate(page)) {
ret = ext4_read_inline_page(inode, page);
if (ret < 0)
goto out_release_page;
}
up_read(&EXT4_I(inode)->xattr_sem);
*pagep = page;
brelse(iloc.bh);
return 1;
out_release_page:
up_read(&EXT4_I(inode)->xattr_sem);
unlock_page(page);
page_cache_release(page);
out_journal:
ext4_journal_stop(handle);
out:
brelse(iloc.bh);
return ret;
}
int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
unsigned len, unsigned copied,
struct page *page)
{
int i_size_changed = 0;
copied = ext4_write_inline_data_end(inode, pos, len, copied, page);
/*
* No need to use i_size_read() here, the i_size
* cannot change under us because we hold i_mutex.
*
* But it's important to update i_size while still holding page lock:
* page writeout could otherwise come in and zero beyond i_size.
*/
if (pos+copied > inode->i_size) {
i_size_write(inode, pos+copied);
i_size_changed = 1;
}
unlock_page(page);
page_cache_release(page);
/*
* Don't mark the inode dirty under page lock. First, it unnecessarily
* makes the holding time of page lock longer. Second, it forces lock
* ordering of page lock and transaction start for journaling
* filesystems.
*/
if (i_size_changed)
mark_inode_dirty(inode);
return copied;
}
#ifdef INLINE_DIR_DEBUG
void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
void *inline_start, int inline_size)
{
int offset;
unsigned short de_len;
struct ext4_dir_entry_2 *de = inline_start;
void *dlimit = inline_start + inline_size;
trace_printk("inode %lu\n", dir->i_ino);
offset = 0;
while ((void *)de < dlimit) {
de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
offset, de_len, de->name_len, de->name,
de->name_len, le32_to_cpu(de->inode));
if (ext4_check_dir_entry(dir, NULL, de, bh,
inline_start, inline_size, offset))
BUG();
offset += de_len;
de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
}
}
#else
#define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
#endif
/*
* Add a new entry into a inline dir.
* It will return -ENOSPC if no space is available, and -EIO
* and -EEXIST if directory entry already exists.
*/
static int ext4_add_dirent_to_inline(handle_t *handle,
struct ext4_filename *fname,
struct inode *dir,
struct inode *inode,
struct ext4_iloc *iloc,
void *inline_start, int inline_size)
{
int err;
struct ext4_dir_entry_2 *de;
err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
inline_size, fname, &de);
if (err)
return err;
BUFFER_TRACE(iloc->bh, "get_write_access");
err = ext4_journal_get_write_access(handle, iloc->bh);
if (err)
return err;
ext4_insert_dentry(dir, inode, de, inline_size, fname);
ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
/*
* XXX shouldn't update any times until successful
* completion of syscall, but too many callers depend
* on this.
*
* XXX similarly, too many callers depend on
* ext4_new_inode() setting the times, but error
* recovery deletes the inode, so the worst that can
* happen is that the times are slightly out of date
* and/or different from the directory change time.
*/
dir->i_mtime = dir->i_ctime = ext4_current_time(dir);
ext4_update_dx_flag(dir);
dir->i_version++;
ext4_mark_inode_dirty(handle, dir);
return 1;
}
static void *ext4_get_inline_xattr_pos(struct inode *inode,
struct ext4_iloc *iloc)
{
struct ext4_xattr_entry *entry;
struct ext4_xattr_ibody_header *header;
BUG_ON(!EXT4_I(inode)->i_inline_off);
header = IHDR(inode, ext4_raw_inode(iloc));
entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
EXT4_I(inode)->i_inline_off);
return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
}
/* Set the final de to cover the whole block. */
static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
{
struct ext4_dir_entry_2 *de, *prev_de;
void *limit;
int de_len;
de = (struct ext4_dir_entry_2 *)de_buf;
if (old_size) {
limit = de_buf + old_size;
do {
prev_de = de;
de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
de_buf += de_len;
de = (struct ext4_dir_entry_2 *)de_buf;
} while (de_buf < limit);
prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
old_size, new_size);
} else {
/* this is just created, so create an empty entry. */
de->inode = 0;
de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
}
}
static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
struct ext4_iloc *iloc)
{
int ret;
int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
int new_size = get_max_inline_xattr_value_size(dir, iloc);
if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
return -ENOSPC;
ret = ext4_update_inline_data(handle, dir,
new_size + EXT4_MIN_INLINE_DATA_SIZE);
if (ret)
return ret;
ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
EXT4_I(dir)->i_inline_size -
EXT4_MIN_INLINE_DATA_SIZE);
dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
return 0;
}
static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
struct ext4_iloc *iloc,
void *buf, int inline_size)
{
ext4_create_inline_data(handle, inode, inline_size);
ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
}
static int ext4_finish_convert_inline_dir(handle_t *handle,
struct inode *inode,
struct buffer_head *dir_block,
void *buf,
int inline_size)
{
int err, csum_size = 0, header_size = 0;
struct ext4_dir_entry_2 *de;
struct ext4_dir_entry_tail *t;
void *target = dir_block->b_data;
/*
* First create "." and ".." and then copy the dir information
* back to the block.
*/
de = (struct ext4_dir_entry_2 *)target;
de = ext4_init_dot_dotdot(inode, de,
inode->i_sb->s_blocksize, csum_size,
le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
header_size = (void *)de - target;
memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
inline_size - EXT4_INLINE_DOTDOT_SIZE);
if (ext4_has_metadata_csum(inode->i_sb))
csum_size = sizeof(struct ext4_dir_entry_tail);
inode->i_size = inode->i_sb->s_blocksize;
i_size_write(inode, inode->i_sb->s_blocksize);
EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
ext4_update_final_de(dir_block->b_data,
inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
inode->i_sb->s_blocksize - csum_size);
if (csum_size) {
t = EXT4_DIRENT_TAIL(dir_block->b_data,
inode->i_sb->s_blocksize);
initialize_dirent_tail(t, inode->i_sb->s_blocksize);
}
set_buffer_uptodate(dir_block);
err = ext4_handle_dirty_dirent_node(handle, inode, dir_block);
if (err)
goto out;
set_buffer_verified(dir_block);
out:
return err;
}
static int ext4_convert_inline_data_nolock(handle_t *handle,
struct inode *inode,
struct ext4_iloc *iloc)
{
int error;
void *buf = NULL;
struct buffer_head *data_bh = NULL;
struct ext4_map_blocks map;
int inline_size;
inline_size = ext4_get_inline_size(inode);
buf = kmalloc(inline_size, GFP_NOFS);
if (!buf) {
error = -ENOMEM;
goto out;
}
error = ext4_read_inline_data(inode, buf, inline_size, iloc);
if (error < 0)
goto out;
/*
* Make sure the inline directory entries pass checks before we try to
* convert them, so that we avoid touching stuff that needs fsck.
*/
if (S_ISDIR(inode->i_mode)) {
error = ext4_check_all_de(inode, iloc->bh,
buf + EXT4_INLINE_DOTDOT_SIZE,
inline_size - EXT4_INLINE_DOTDOT_SIZE);
if (error)
goto out;
}
error = ext4_destroy_inline_data_nolock(handle, inode);
if (error)
goto out;
map.m_lblk = 0;
map.m_len = 1;
map.m_flags = 0;
error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
if (error < 0)
goto out_restore;
if (!(map.m_flags & EXT4_MAP_MAPPED)) {
error = -EIO;
goto out_restore;
}
data_bh = sb_getblk(inode->i_sb, map.m_pblk);
if (!data_bh) {
error = -ENOMEM;
goto out_restore;
}
lock_buffer(data_bh);
error = ext4_journal_get_create_access(handle, data_bh);
if (error) {
unlock_buffer(data_bh);
error = -EIO;
goto out_restore;
}
memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
if (!S_ISDIR(inode->i_mode)) {
memcpy(data_bh->b_data, buf, inline_size);
set_buffer_uptodate(data_bh);
error = ext4_handle_dirty_metadata(handle,
inode, data_bh);
} else {
error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
buf, inline_size);
}
unlock_buffer(data_bh);
out_restore:
if (error)
ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
out:
brelse(data_bh);
kfree(buf);
return error;
}
/*
* Try to add the new entry to the inline data.
* If succeeds, return 0. If not, extended the inline dir and copied data to
* the new created block.
*/
int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
struct inode *dir, struct inode *inode)
{
int ret, inline_size;
void *inline_start;
struct ext4_iloc iloc;
ret = ext4_get_inode_loc(dir, &iloc);
if (ret)
return ret;
down_write(&EXT4_I(dir)->xattr_sem);
if (!ext4_has_inline_data(dir))
goto out;
inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
EXT4_INLINE_DOTDOT_SIZE;
inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
inline_start, inline_size);
if (ret != -ENOSPC)
goto out;
/* check whether it can be inserted to inline xattr space. */
inline_size = EXT4_I(dir)->i_inline_size -
EXT4_MIN_INLINE_DATA_SIZE;
if (!inline_size) {
/* Try to use the xattr space.*/
ret = ext4_update_inline_dir(handle, dir, &iloc);
if (ret && ret != -ENOSPC)
goto out;
inline_size = EXT4_I(dir)->i_inline_size -
EXT4_MIN_INLINE_DATA_SIZE;
}
if (inline_size) {
inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
ret = ext4_add_dirent_to_inline(handle, fname, dir,
inode, &iloc, inline_start,
inline_size);
if (ret != -ENOSPC)
goto out;
}
/*
* The inline space is filled up, so create a new block for it.
* As the extent tree will be created, we have to save the inline
* dir first.
*/
ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
out:
ext4_mark_inode_dirty(handle, dir);
up_write(&EXT4_I(dir)->xattr_sem);
brelse(iloc.bh);
return ret;
}
/*
* This function fills a red-black tree with information from an
* inlined dir. It returns the number directory entries loaded
* into the tree. If there is an error it is returned in err.
*/
int htree_inlinedir_to_tree(struct file *dir_file,
struct inode *dir, ext4_lblk_t block,
struct dx_hash_info *hinfo,
__u32 start_hash, __u32 start_minor_hash,
int *has_inline_data)
{
int err = 0, count = 0;
unsigned int parent_ino;
int pos;
struct ext4_dir_entry_2 *de;
struct inode *inode = file_inode(dir_file);
int ret, inline_size = 0;
struct ext4_iloc iloc;
void *dir_buf = NULL;
struct ext4_dir_entry_2 fake;
struct ext4_str tmp_str;
ret = ext4_get_inode_loc(inode, &iloc);
if (ret)
return ret;
down_read(&EXT4_I(inode)->xattr_sem);
if (!ext4_has_inline_data(inode)) {
up_read(&EXT4_I(inode)->xattr_sem);
*has_inline_data = 0;
goto out;
}
inline_size = ext4_get_inline_size(inode);
dir_buf = kmalloc(inline_size, GFP_NOFS);
if (!dir_buf) {
ret = -ENOMEM;
up_read(&EXT4_I(inode)->xattr_sem);
goto out;
}
ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
up_read(&EXT4_I(inode)->xattr_sem);
if (ret < 0)
goto out;
pos = 0;
parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
while (pos < inline_size) {
/*
* As inlined dir doesn't store any information about '.' and
* only the inode number of '..' is stored, we have to handle
* them differently.
*/
if (pos == 0) {
fake.inode = cpu_to_le32(inode->i_ino);
fake.name_len = 1;
strcpy(fake.name, ".");
fake.rec_len = ext4_rec_len_to_disk(
EXT4_DIR_REC_LEN(fake.name_len),
inline_size);
ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
de = &fake;
pos = EXT4_INLINE_DOTDOT_OFFSET;
} else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
fake.inode = cpu_to_le32(parent_ino);
fake.name_len = 2;
strcpy(fake.name, "..");
fake.rec_len = ext4_rec_len_to_disk(
EXT4_DIR_REC_LEN(fake.name_len),
inline_size);
ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
de = &fake;
pos = EXT4_INLINE_DOTDOT_SIZE;
} else {
de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
if (ext4_check_dir_entry(inode, dir_file, de,
iloc.bh, dir_buf,
inline_size, pos)) {
ret = count;
goto out;
}
}
ext4fs_dirhash(de->name, de->name_len, hinfo);
if ((hinfo->hash < start_hash) ||
((hinfo->hash == start_hash) &&
(hinfo->minor_hash < start_minor_hash)))
continue;
if (de->inode == 0)
continue;
tmp_str.name = de->name;
tmp_str.len = de->name_len;
err = ext4_htree_store_dirent(dir_file, hinfo->hash,
hinfo->minor_hash, de, &tmp_str);
if (err) {
count = err;
goto out;
}
count++;
}
ret = count;
out:
kfree(dir_buf);
brelse(iloc.bh);
return ret;
}
/*
* So this function is called when the volume is mkfsed with
* dir_index disabled. In order to keep f_pos persistent
* after we convert from an inlined dir to a blocked based,
* we just pretend that we are a normal dir and return the
* offset as if '.' and '..' really take place.
*
*/
int ext4_read_inline_dir(struct file *file,
struct dir_context *ctx,
int *has_inline_data)
{
unsigned int offset, parent_ino;
int i;
struct ext4_dir_entry_2 *de;
struct super_block *sb;
struct inode *inode = file_inode(file);
int ret, inline_size = 0;
struct ext4_iloc iloc;
void *dir_buf = NULL;
int dotdot_offset, dotdot_size, extra_offset, extra_size;
ret = ext4_get_inode_loc(inode, &iloc);
if (ret)
return ret;
down_read(&EXT4_I(inode)->xattr_sem);
if (!ext4_has_inline_data(inode)) {
up_read(&EXT4_I(inode)->xattr_sem);
*has_inline_data = 0;
goto out;
}
inline_size = ext4_get_inline_size(inode);
dir_buf = kmalloc(inline_size, GFP_NOFS);
if (!dir_buf) {
ret = -ENOMEM;
up_read(&EXT4_I(inode)->xattr_sem);
goto out;
}
ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
up_read(&EXT4_I(inode)->xattr_sem);
if (ret < 0)
goto out;
ret = 0;
sb = inode->i_sb;
parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
offset = ctx->pos;
/*
* dotdot_offset and dotdot_size is the real offset and
* size for ".." and "." if the dir is block based while
* the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
* So we will use extra_offset and extra_size to indicate them
* during the inline dir iteration.
*/
dotdot_offset = EXT4_DIR_REC_LEN(1);
dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
extra_size = extra_offset + inline_size;
/*
* If the version has changed since the last call to
* readdir(2), then we might be pointing to an invalid
* dirent right now. Scan from the start of the inline
* dir to make sure.
*/
if (file->f_version != inode->i_version) {
for (i = 0; i < extra_size && i < offset;) {
/*
* "." is with offset 0 and
* ".." is dotdot_offset.
*/
if (!i) {
i = dotdot_offset;
continue;
} else if (i == dotdot_offset) {
i = dotdot_size;
continue;
}
/* for other entry, the real offset in
* the buf has to be tuned accordingly.
*/
de = (struct ext4_dir_entry_2 *)
(dir_buf + i - extra_offset);
/* It's too expensive to do a full
* dirent test each time round this
* loop, but we do have to test at
* least that it is non-zero. A
* failure will be detected in the
* dirent test below. */
if (ext4_rec_len_from_disk(de->rec_len, extra_size)
< EXT4_DIR_REC_LEN(1))
break;
i += ext4_rec_len_from_disk(de->rec_len,
extra_size);
}
offset = i;
ctx->pos = offset;
file->f_version = inode->i_version;
}
while (ctx->pos < extra_size) {
if (ctx->pos == 0) {
if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
goto out;
ctx->pos = dotdot_offset;
continue;
}
if (ctx->pos == dotdot_offset) {
if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
goto out;
ctx->pos = dotdot_size;
continue;
}
de = (struct ext4_dir_entry_2 *)
(dir_buf + ctx->pos - extra_offset);
if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
extra_size, ctx->pos))
goto out;
if (le32_to_cpu(de->inode)) {
if (!dir_emit(ctx, de->name, de->name_len,
le32_to_cpu(de->inode),
get_dtype(sb, de->file_type)))
goto out;
}
ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
}
out:
kfree(dir_buf);
brelse(iloc.bh);
return ret;
}
struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
struct ext4_dir_entry_2 **parent_de,
int *retval)
{
struct ext4_iloc iloc;
*retval = ext4_get_inode_loc(inode, &iloc);
if (*retval)
return NULL;
*parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
return iloc.bh;
}
/*
* Try to create the inline data for the new dir.
* If it succeeds, return 0, otherwise return the error.
* In case of ENOSPC, the caller should create the normal disk layout dir.
*/
int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
struct inode *inode)
{
int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
struct ext4_iloc iloc;
struct ext4_dir_entry_2 *de;
ret = ext4_get_inode_loc(inode, &iloc);
if (ret)
return ret;
ret = ext4_prepare_inline_data(handle, inode, inline_size);
if (ret)
goto out;
/*
* For inline dir, we only save the inode information for the ".."
* and create a fake dentry to cover the left space.
*/
de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
de->inode = cpu_to_le32(parent->i_ino);
de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
de->inode = 0;
de->rec_len = ext4_rec_len_to_disk(
inline_size - EXT4_INLINE_DOTDOT_SIZE,
inline_size);
set_nlink(inode, 2);
inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
out:
brelse(iloc.bh);
return ret;
}
struct buffer_head *ext4_find_inline_entry(struct inode *dir,
struct ext4_filename *fname,
const struct qstr *d_name,
struct ext4_dir_entry_2 **res_dir,
int *has_inline_data)
{
int ret;
struct ext4_iloc iloc;
void *inline_start;
int inline_size;
if (ext4_get_inode_loc(dir, &iloc))
return NULL;
down_read(&EXT4_I(dir)->xattr_sem);
if (!ext4_has_inline_data(dir)) {
*has_inline_data = 0;
goto out;
}
inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
EXT4_INLINE_DOTDOT_SIZE;
inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
dir, fname, d_name, 0, res_dir);
if (ret == 1)
goto out_find;
if (ret < 0)
goto out;
if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
goto out;
inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
dir, fname, d_name, 0, res_dir);
if (ret == 1)
goto out_find;
out:
brelse(iloc.bh);
iloc.bh = NULL;
out_find:
up_read(&EXT4_I(dir)->xattr_sem);
return iloc.bh;
}
int ext4_delete_inline_entry(handle_t *handle,
struct inode *dir,
struct ext4_dir_entry_2 *de_del,
struct buffer_head *bh,
int *has_inline_data)
{
int err, inline_size;
struct ext4_iloc iloc;
void *inline_start;
err = ext4_get_inode_loc(dir, &iloc);
if (err)
return err;
down_write(&EXT4_I(dir)->xattr_sem);
if (!ext4_has_inline_data(dir)) {
*has_inline_data = 0;
goto out;
}
if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
EXT4_MIN_INLINE_DATA_SIZE) {
inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
EXT4_INLINE_DOTDOT_SIZE;
inline_size = EXT4_MIN_INLINE_DATA_SIZE -
EXT4_INLINE_DOTDOT_SIZE;
} else {
inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
inline_size = ext4_get_inline_size(dir) -
EXT4_MIN_INLINE_DATA_SIZE;
}
BUFFER_TRACE(bh, "get_write_access");
err = ext4_journal_get_write_access(handle, bh);
if (err)
goto out;
err = ext4_generic_delete_entry(handle, dir, de_del, bh,
inline_start, inline_size, 0);
if (err)
goto out;
BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata");
err = ext4_mark_inode_dirty(handle, dir);
if (unlikely(err))
goto out;
ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
out:
up_write(&EXT4_I(dir)->xattr_sem);
brelse(iloc.bh);
if (err != -ENOENT)
ext4_std_error(dir->i_sb, err);
return err;
}
/*
* Get the inline dentry at offset.
*/
static inline struct ext4_dir_entry_2 *
ext4_get_inline_entry(struct inode *inode,
struct ext4_iloc *iloc,
unsigned int offset,
void **inline_start,
int *inline_size)
{
void *inline_pos;
BUG_ON(offset > ext4_get_inline_size(inode));
if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
*inline_size = EXT4_MIN_INLINE_DATA_SIZE;
} else {
inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
offset -= EXT4_MIN_INLINE_DATA_SIZE;
*inline_size = ext4_get_inline_size(inode) -
EXT4_MIN_INLINE_DATA_SIZE;
}
if (inline_start)
*inline_start = inline_pos;
return (struct ext4_dir_entry_2 *)(inline_pos + offset);
}
int empty_inline_dir(struct inode *dir, int *has_inline_data)
{
int err, inline_size;
struct ext4_iloc iloc;
void *inline_pos;
unsigned int offset;
struct ext4_dir_entry_2 *de;
int ret = 1;
err = ext4_get_inode_loc(dir, &iloc);
if (err) {
EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
err, dir->i_ino);
return 1;
}
down_read(&EXT4_I(dir)->xattr_sem);
if (!ext4_has_inline_data(dir)) {
*has_inline_data = 0;
goto out;
}
de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
if (!le32_to_cpu(de->inode)) {
ext4_warning(dir->i_sb,
"bad inline directory (dir #%lu) - no `..'",
dir->i_ino);
ret = 1;
goto out;
}
offset = EXT4_INLINE_DOTDOT_SIZE;
while (offset < dir->i_size) {
de = ext4_get_inline_entry(dir, &iloc, offset,
&inline_pos, &inline_size);
if (ext4_check_dir_entry(dir, NULL, de,
iloc.bh, inline_pos,
inline_size, offset)) {
ext4_warning(dir->i_sb,
"bad inline directory (dir #%lu) - "
"inode %u, rec_len %u, name_len %d"
"inline size %d\n",
dir->i_ino, le32_to_cpu(de->inode),
le16_to_cpu(de->rec_len), de->name_len,
inline_size);
ret = 1;
goto out;
}
if (le32_to_cpu(de->inode)) {
ret = 0;
goto out;
}
offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
}
out:
up_read(&EXT4_I(dir)->xattr_sem);
brelse(iloc.bh);
return ret;
}
int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
{
int ret;
down_write(&EXT4_I(inode)->xattr_sem);
ret = ext4_destroy_inline_data_nolock(handle, inode);
up_write(&EXT4_I(inode)->xattr_sem);
return ret;
}
int ext4_inline_data_fiemap(struct inode *inode,
struct fiemap_extent_info *fieinfo,
int *has_inline, __u64 start, __u64 len)
{
__u64 physical = 0;
__u64 inline_len;
__u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
FIEMAP_EXTENT_LAST;
int error = 0;
struct ext4_iloc iloc;
down_read(&EXT4_I(inode)->xattr_sem);
if (!ext4_has_inline_data(inode)) {
*has_inline = 0;
goto out;
}
inline_len = min_t(size_t, ext4_get_inline_size(inode),
i_size_read(inode));
if (start >= inline_len)
goto out;
if (start + len < inline_len)
inline_len = start + len;
inline_len -= start;
error = ext4_get_inode_loc(inode, &iloc);
if (error)
goto out;
physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
physical += offsetof(struct ext4_inode, i_block);
if (physical)
error = fiemap_fill_next_extent(fieinfo, start, physical,
inline_len, flags);
brelse(iloc.bh);
out:
up_read(&EXT4_I(inode)->xattr_sem);
return (error < 0 ? error : 0);
}
/*
* Called during xattr set, and if we can sparse space 'needed',
* just create the extent tree evict the data to the outer block.
*
* We use jbd2 instead of page cache to move data to the 1st block
* so that the whole transaction can be committed as a whole and
* the data isn't lost because of the delayed page cache write.
*/
int ext4_try_to_evict_inline_data(handle_t *handle,
struct inode *inode,
int needed)
{
int error;
struct ext4_xattr_entry *entry;
struct ext4_inode *raw_inode;
struct ext4_iloc iloc;
error = ext4_get_inode_loc(inode, &iloc);
if (error)
return error;
raw_inode = ext4_raw_inode(&iloc);
entry = (struct ext4_xattr_entry *)((void *)raw_inode +
EXT4_I(inode)->i_inline_off);
if (EXT4_XATTR_LEN(entry->e_name_len) +
EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)) < needed) {
error = -ENOSPC;
goto out;
}
error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
out:
brelse(iloc.bh);
return error;
}
void ext4_inline_data_truncate(struct inode *inode, int *has_inline)
{
handle_t *handle;
int inline_size, value_len, needed_blocks;
size_t i_size;
void *value = NULL;
struct ext4_xattr_ibody_find is = {
.s = { .not_found = -ENODATA, },
};
struct ext4_xattr_info i = {
.name_index = EXT4_XATTR_INDEX_SYSTEM,
.name = EXT4_XATTR_SYSTEM_DATA,
};
needed_blocks = ext4_writepage_trans_blocks(inode);
handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
if (IS_ERR(handle))
return;
down_write(&EXT4_I(inode)->xattr_sem);
if (!ext4_has_inline_data(inode)) {
*has_inline = 0;
ext4_journal_stop(handle);
return;
}
if (ext4_orphan_add(handle, inode))
goto out;
if (ext4_get_inode_loc(inode, &is.iloc))
goto out;
down_write(&EXT4_I(inode)->i_data_sem);
i_size = inode->i_size;
inline_size = ext4_get_inline_size(inode);
EXT4_I(inode)->i_disksize = i_size;
if (i_size < inline_size) {
/* Clear the content in the xattr space. */
if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
if (ext4_xattr_ibody_find(inode, &i, &is))
goto out_error;
BUG_ON(is.s.not_found);
value_len = le32_to_cpu(is.s.here->e_value_size);
value = kmalloc(value_len, GFP_NOFS);
if (!value)
goto out_error;
if (ext4_xattr_ibody_get(inode, i.name_index, i.name,
value, value_len))
goto out_error;
i.value = value;
i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
if (ext4_xattr_ibody_inline_set(handle, inode, &i, &is))
goto out_error;
}
/* Clear the content within i_blocks. */
if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
memset(p + i_size, 0,
EXT4_MIN_INLINE_DATA_SIZE - i_size);
}
EXT4_I(inode)->i_inline_size = i_size <
EXT4_MIN_INLINE_DATA_SIZE ?
EXT4_MIN_INLINE_DATA_SIZE : i_size;
}
out_error:
up_write(&EXT4_I(inode)->i_data_sem);
out:
brelse(is.iloc.bh);
up_write(&EXT4_I(inode)->xattr_sem);
kfree(value);
if (inode->i_nlink)
ext4_orphan_del(handle, inode);
inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
ext4_mark_inode_dirty(handle, inode);
if (IS_SYNC(inode))
ext4_handle_sync(handle);
ext4_journal_stop(handle);
return;
}
int ext4_convert_inline_data(struct inode *inode)
{
int error, needed_blocks;
handle_t *handle;
struct ext4_iloc iloc;
if (!ext4_has_inline_data(inode)) {
ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
return 0;
}
needed_blocks = ext4_writepage_trans_blocks(inode);
iloc.bh = NULL;
error = ext4_get_inode_loc(inode, &iloc);
if (error)
return error;
handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
if (IS_ERR(handle)) {
error = PTR_ERR(handle);
goto out_free;
}
down_write(&EXT4_I(inode)->xattr_sem);
if (!ext4_has_inline_data(inode)) {
up_write(&EXT4_I(inode)->xattr_sem);
goto out;
}
error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
up_write(&EXT4_I(inode)->xattr_sem);
out:
ext4_journal_stop(handle);
out_free:
brelse(iloc.bh);
return error;
}