mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 11:19:37 +00:00
![Dmitry Monakhov](/assets/img/avatar_default.png)
Testcase: xfstests generic/270 MKFS_OPTIONS="-q -I 256 -O inline_data,64bit" Call Trace: [<ffffffff81144c76>] lock_page+0x35/0x39 -------> DEADLOCK [<ffffffff81145260>] pagecache_get_page+0x65/0x15a [<ffffffff811507fc>] truncate_inode_pages_range+0x1db/0x45c [<ffffffff8120ea63>] ? ext4_da_get_block_prep+0x439/0x4b6 [<ffffffff811b29b7>] ? __block_write_begin+0x284/0x29c [<ffffffff8120e62a>] ? ext4_change_inode_journal_flag+0x16b/0x16b [<ffffffff81150af0>] truncate_inode_pages+0x12/0x14 [<ffffffff81247cb4>] ext4_truncate_failed_write+0x19/0x25 [<ffffffff812488cf>] ext4_da_write_inline_data_begin+0x196/0x31c [<ffffffff81210dad>] ext4_da_write_begin+0x189/0x302 [<ffffffff810c07ac>] ? trace_hardirqs_on+0xd/0xf [<ffffffff810ddd13>] ? read_seqcount_begin.clone.1+0x9f/0xcc [<ffffffff8114309d>] generic_perform_write+0xc7/0x1c6 [<ffffffff810c040e>] ? mark_held_locks+0x59/0x77 [<ffffffff811445d1>] __generic_file_write_iter+0x17f/0x1c5 [<ffffffff8120726b>] ext4_file_write_iter+0x2a5/0x354 [<ffffffff81185656>] ? file_start_write+0x2a/0x2c [<ffffffff8107bcdb>] ? bad_area_nosemaphore+0x13/0x15 [<ffffffff811858ce>] new_sync_write+0x8a/0xb2 [<ffffffff81186e7b>] vfs_write+0xb5/0x14d [<ffffffff81186ffb>] SyS_write+0x5c/0x8c [<ffffffff816f2529>] system_call_fastpath+0x12/0x17 Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2018 lines
49 KiB
C
2018 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 "ext4_jbd2.h"
|
|
#include "ext4.h"
|
|
#include "xattr.h"
|
|
#include "truncate.h"
|
|
#include <linux/fiemap.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_INCOMPAT_FEATURE(inode->i_sb,
|
|
EXT4_FEATURE_INCOMPAT_EXTENTS)) {
|
|
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 dentry *dentry,
|
|
struct inode *inode,
|
|
struct ext4_iloc *iloc,
|
|
void *inline_start, int inline_size)
|
|
{
|
|
struct inode *dir = dentry->d_parent->d_inode;
|
|
const char *name = dentry->d_name.name;
|
|
int namelen = dentry->d_name.len;
|
|
int err;
|
|
struct ext4_dir_entry_2 *de;
|
|
|
|
err = ext4_find_dest_de(dir, inode, iloc->bh,
|
|
inline_start, inline_size,
|
|
name, namelen, &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(inode, de, inline_size, name, namelen);
|
|
|
|
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 dentry *dentry,
|
|
struct inode *inode)
|
|
{
|
|
int ret, inline_size;
|
|
void *inline_start;
|
|
struct ext4_iloc iloc;
|
|
struct inode *dir = dentry->d_parent->d_inode;
|
|
|
|
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, dentry, 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, dentry, 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;
|
|
|
|
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;
|
|
err = ext4_htree_store_dirent(dir_file,
|
|
hinfo->hash, hinfo->minor_hash, de);
|
|
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,
|
|
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 = search_dir(iloc.bh, inline_start, inline_size,
|
|
dir, 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 = search_dir(iloc.bh, inline_start, inline_size,
|
|
dir, 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;
|
|
}
|