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inode.c
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inode.c
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// SPDX-License-Identifier: GPL-2.0
/*
*
* Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
*
*/
#include <linux/blkdev.h>
#include <linux/buffer_head.h>
#include <linux/fs.h>
#include <linux/iversion.h>
#include <linux/mpage.h>
#include <linux/namei.h>
#include <linux/nls.h>
#include <linux/uio.h>
#include <linux/writeback.h>
#include "debug.h"
#include "ntfs.h"
#include "ntfs_fs.h"
/*
* ntfs_read_mft
*
* reads record and parses MFT
*/
static struct inode *ntfs_read_mft(struct inode *inode,
const struct cpu_str *name,
const struct MFT_REF *ref)
{
int err = 0;
struct ntfs_inode *ni = ntfs_i(inode);
struct super_block *sb = inode->i_sb;
struct ntfs_sb_info *sbi = sb->s_fs_info;
mode_t mode = 0;
struct ATTR_STD_INFO5 *std5 = NULL;
struct ATTR_LIST_ENTRY *le;
struct ATTRIB *attr;
bool is_match = false;
bool is_root = false;
bool is_dir;
unsigned long ino = inode->i_ino;
u32 rp_fa = 0, asize, t32;
u16 roff, rsize, names = 0;
const struct ATTR_FILE_NAME *fname = NULL;
const struct INDEX_ROOT *root;
struct REPARSE_DATA_BUFFER rp; // 0x18 bytes
u64 t64;
struct MFT_REC *rec;
struct runs_tree *run;
inode->i_op = NULL;
/* Setup 'uid' and 'gid' */
inode->i_uid = sbi->options.fs_uid;
inode->i_gid = sbi->options.fs_gid;
err = mi_init(&ni->mi, sbi, ino);
if (err)
goto out;
if (!sbi->mft.ni && ino == MFT_REC_MFT && !sb->s_root) {
t64 = sbi->mft.lbo >> sbi->cluster_bits;
t32 = bytes_to_cluster(sbi, MFT_REC_VOL * sbi->record_size);
sbi->mft.ni = ni;
init_rwsem(&ni->file.run_lock);
if (!run_add_entry(&ni->file.run, 0, t64, t32, true)) {
err = -ENOMEM;
goto out;
}
}
err = mi_read(&ni->mi, ino == MFT_REC_MFT);
if (err)
goto out;
rec = ni->mi.mrec;
if (sbi->flags & NTFS_FLAGS_LOG_REPLAYING) {
;
} else if (ref->seq != rec->seq) {
err = -EINVAL;
ntfs_err(sb, "MFT: r=%lx, expect seq=%x instead of %x!", ino,
le16_to_cpu(ref->seq), le16_to_cpu(rec->seq));
goto out;
} else if (!is_rec_inuse(rec)) {
err = -EINVAL;
ntfs_err(sb, "Inode r=%x is not in use!", (u32)ino);
goto out;
}
if (le32_to_cpu(rec->total) != sbi->record_size) {
// bad inode?
err = -EINVAL;
goto out;
}
if (!is_rec_base(rec))
goto Ok;
/* record should contain $I30 root */
is_dir = rec->flags & RECORD_FLAG_DIR;
inode->i_generation = le16_to_cpu(rec->seq);
/* Enumerate all struct Attributes MFT */
le = NULL;
attr = NULL;
/*
* to reduce tab pressure use goto instead of
* while( (attr = ni_enum_attr_ex(ni, attr, &le, NULL) ))
*/
next_attr:
run = NULL;
err = -EINVAL;
attr = ni_enum_attr_ex(ni, attr, &le, NULL);
if (!attr)
goto end_enum;
if (le && le->vcn) {
/* This is non primary attribute segment. Ignore if not MFT */
if (ino != MFT_REC_MFT || attr->type != ATTR_DATA)
goto next_attr;
run = &ni->file.run;
asize = le32_to_cpu(attr->size);
goto attr_unpack_run;
}
roff = attr->non_res ? 0 : le16_to_cpu(attr->res.data_off);
rsize = attr->non_res ? 0 : le32_to_cpu(attr->res.data_size);
asize = le32_to_cpu(attr->size);
switch (attr->type) {
case ATTR_STD:
if (attr->non_res ||
asize < sizeof(struct ATTR_STD_INFO) + roff ||
rsize < sizeof(struct ATTR_STD_INFO))
goto out;
if (std5)
goto next_attr;
std5 = Add2Ptr(attr, roff);
#ifdef STATX_BTIME
nt2kernel(std5->cr_time, &ni->i_crtime);
#endif
nt2kernel(std5->a_time, &inode->i_atime);
nt2kernel(std5->c_time, &inode->i_ctime);
nt2kernel(std5->m_time, &inode->i_mtime);
ni->std_fa = std5->fa;
if (asize >= sizeof(struct ATTR_STD_INFO5) + roff &&
rsize >= sizeof(struct ATTR_STD_INFO5))
ni->std_security_id = std5->security_id;
goto next_attr;
case ATTR_LIST:
if (attr->name_len || le || ino == MFT_REC_LOG)
goto out;
err = ntfs_load_attr_list(ni, attr);
if (err)
goto out;
le = NULL;
attr = NULL;
goto next_attr;
case ATTR_NAME:
if (attr->non_res || asize < SIZEOF_ATTRIBUTE_FILENAME + roff ||
rsize < SIZEOF_ATTRIBUTE_FILENAME)
goto out;
fname = Add2Ptr(attr, roff);
if (fname->type == FILE_NAME_DOS)
goto next_attr;
names += 1;
if (name && name->len == fname->name_len &&
!ntfs_cmp_names_cpu(name, (struct le_str *)&fname->name_len,
NULL, false))
is_match = true;
goto next_attr;
case ATTR_DATA:
if (is_dir) {
/* ignore data attribute in dir record */
goto next_attr;
}
if (ino == MFT_REC_BADCLUST && !attr->non_res)
goto next_attr;
if (attr->name_len &&
((ino != MFT_REC_BADCLUST || !attr->non_res ||
attr->name_len != ARRAY_SIZE(BAD_NAME) ||
memcmp(attr_name(attr), BAD_NAME, sizeof(BAD_NAME))) &&
(ino != MFT_REC_SECURE || !attr->non_res ||
attr->name_len != ARRAY_SIZE(SDS_NAME) ||
memcmp(attr_name(attr), SDS_NAME, sizeof(SDS_NAME))))) {
/* file contains stream attribute. ignore it */
goto next_attr;
}
if (is_attr_sparsed(attr))
ni->std_fa |= FILE_ATTRIBUTE_SPARSE_FILE;
else
ni->std_fa &= ~FILE_ATTRIBUTE_SPARSE_FILE;
if (is_attr_compressed(attr))
ni->std_fa |= FILE_ATTRIBUTE_COMPRESSED;
else
ni->std_fa &= ~FILE_ATTRIBUTE_COMPRESSED;
if (is_attr_encrypted(attr))
ni->std_fa |= FILE_ATTRIBUTE_ENCRYPTED;
else
ni->std_fa &= ~FILE_ATTRIBUTE_ENCRYPTED;
if (!attr->non_res) {
ni->i_valid = inode->i_size = rsize;
inode_set_bytes(inode, rsize);
t32 = asize;
} else {
t32 = le16_to_cpu(attr->nres.run_off);
}
mode = S_IFREG | (0777 & sbi->options.fs_fmask_inv);
if (!attr->non_res) {
ni->ni_flags |= NI_FLAG_RESIDENT;
goto next_attr;
}
inode_set_bytes(inode, attr_ondisk_size(attr));
ni->i_valid = le64_to_cpu(attr->nres.valid_size);
inode->i_size = le64_to_cpu(attr->nres.data_size);
if (!attr->nres.alloc_size)
goto next_attr;
run = ino == MFT_REC_BITMAP ? &sbi->used.bitmap.run
: &ni->file.run;
break;
case ATTR_ROOT:
if (attr->non_res)
goto out;
root = Add2Ptr(attr, roff);
is_root = true;
if (attr->name_len != ARRAY_SIZE(I30_NAME) ||
memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
goto next_attr;
if (root->type != ATTR_NAME ||
root->rule != NTFS_COLLATION_TYPE_FILENAME)
goto out;
if (!is_dir)
goto next_attr;
ni->ni_flags |= NI_FLAG_DIR;
err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
if (err)
goto out;
mode = sb->s_root
? (S_IFDIR | (0777 & sbi->options.fs_dmask_inv))
: (S_IFDIR | 0777);
goto next_attr;
case ATTR_ALLOC:
if (!is_root || attr->name_len != ARRAY_SIZE(I30_NAME) ||
memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
goto next_attr;
inode->i_size = le64_to_cpu(attr->nres.data_size);
ni->i_valid = le64_to_cpu(attr->nres.valid_size);
inode_set_bytes(inode, le64_to_cpu(attr->nres.alloc_size));
run = &ni->dir.alloc_run;
break;
case ATTR_BITMAP:
if (ino == MFT_REC_MFT) {
if (!attr->non_res)
goto out;
#ifndef CONFIG_NTFS3_64BIT_CLUSTER
/* 0x20000000 = 2^32 / 8 */
if (le64_to_cpu(attr->nres.alloc_size) >= 0x20000000)
goto out;
#endif
run = &sbi->mft.bitmap.run;
break;
} else if (is_dir && attr->name_len == ARRAY_SIZE(I30_NAME) &&
!memcmp(attr_name(attr), I30_NAME,
sizeof(I30_NAME)) &&
attr->non_res) {
run = &ni->dir.bitmap_run;
break;
}
goto next_attr;
case ATTR_REPARSE:
if (attr->name_len)
goto next_attr;
rp_fa = ni_parse_reparse(ni, attr, &rp);
switch (rp_fa) {
case REPARSE_LINK:
if (!attr->non_res) {
inode->i_size = rsize;
inode_set_bytes(inode, rsize);
t32 = asize;
} else {
inode->i_size =
le64_to_cpu(attr->nres.data_size);
t32 = le16_to_cpu(attr->nres.run_off);
}
/* Looks like normal symlink */
ni->i_valid = inode->i_size;
/* Clear directory bit */
if (ni->ni_flags & NI_FLAG_DIR) {
indx_clear(&ni->dir);
memset(&ni->dir, 0, sizeof(ni->dir));
ni->ni_flags &= ~NI_FLAG_DIR;
} else {
run_close(&ni->file.run);
}
mode = S_IFLNK | 0777;
is_dir = false;
if (attr->non_res) {
run = &ni->file.run;
goto attr_unpack_run; // double break
}
break;
case REPARSE_COMPRESSED:
break;
case REPARSE_DEDUPLICATED:
break;
}
goto next_attr;
case ATTR_EA_INFO:
if (!attr->name_len &&
resident_data_ex(attr, sizeof(struct EA_INFO))) {
ni->ni_flags |= NI_FLAG_EA;
/*
* ntfs_get_wsl_perm updates inode->i_uid, inode->i_gid, inode->i_mode
*/
inode->i_mode = mode;
ntfs_get_wsl_perm(inode);
mode = inode->i_mode;
}
goto next_attr;
default:
goto next_attr;
}
attr_unpack_run:
roff = le16_to_cpu(attr->nres.run_off);
t64 = le64_to_cpu(attr->nres.svcn);
err = run_unpack_ex(run, sbi, ino, t64, le64_to_cpu(attr->nres.evcn),
t64, Add2Ptr(attr, roff), asize - roff);
if (err < 0)
goto out;
err = 0;
goto next_attr;
end_enum:
if (!std5)
goto out;
if (!is_match && name) {
/* reuse rec as buffer for ascii name */
err = -ENOENT;
goto out;
}
if (std5->fa & FILE_ATTRIBUTE_READONLY)
mode &= ~0222;
if (!names) {
err = -EINVAL;
goto out;
}
set_nlink(inode, names);
if (S_ISDIR(mode)) {
ni->std_fa |= FILE_ATTRIBUTE_DIRECTORY;
/*
* dot and dot-dot should be included in count but was not
* included in enumeration.
* Usually a hard links to directories are disabled
*/
inode->i_op = &ntfs_dir_inode_operations;
inode->i_fop = &ntfs_dir_operations;
ni->i_valid = 0;
} else if (S_ISLNK(mode)) {
ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
inode->i_op = &ntfs_link_inode_operations;
inode->i_fop = NULL;
inode_nohighmem(inode); // ??
} else if (S_ISREG(mode)) {
ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
inode->i_op = &ntfs_file_inode_operations;
inode->i_fop = &ntfs_file_operations;
inode->i_mapping->a_ops =
is_compressed(ni) ? &ntfs_aops_cmpr : &ntfs_aops;
if (ino != MFT_REC_MFT)
init_rwsem(&ni->file.run_lock);
} else if (S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode) ||
S_ISSOCK(mode)) {
inode->i_op = &ntfs_special_inode_operations;
init_special_inode(inode, mode, inode->i_rdev);
} else if (fname && fname->home.low == cpu_to_le32(MFT_REC_EXTEND) &&
fname->home.seq == cpu_to_le16(MFT_REC_EXTEND)) {
/* Records in $Extend are not a files or general directories */
} else {
err = -EINVAL;
goto out;
}
if ((sbi->options.sys_immutable &&
(std5->fa & FILE_ATTRIBUTE_SYSTEM)) &&
!S_ISFIFO(mode) && !S_ISSOCK(mode) && !S_ISLNK(mode)) {
inode->i_flags |= S_IMMUTABLE;
} else {
inode->i_flags &= ~S_IMMUTABLE;
}
inode->i_mode = mode;
if (!(ni->ni_flags & NI_FLAG_EA)) {
/* if no xattr then no security (stored in xattr) */
inode->i_flags |= S_NOSEC;
}
Ok:
if (ino == MFT_REC_MFT && !sb->s_root)
sbi->mft.ni = NULL;
unlock_new_inode(inode);
return inode;
out:
if (ino == MFT_REC_MFT && !sb->s_root)
sbi->mft.ni = NULL;
iget_failed(inode);
return ERR_PTR(err);
}
/* returns 1 if match */
static int ntfs_test_inode(struct inode *inode, void *data)
{
struct MFT_REF *ref = data;
return ino_get(ref) == inode->i_ino;
}
static int ntfs_set_inode(struct inode *inode, void *data)
{
const struct MFT_REF *ref = data;
inode->i_ino = ino_get(ref);
return 0;
}
struct inode *ntfs_iget5(struct super_block *sb, const struct MFT_REF *ref,
const struct cpu_str *name)
{
struct inode *inode;
inode = iget5_locked(sb, ino_get(ref), ntfs_test_inode, ntfs_set_inode,
(void *)ref);
if (unlikely(!inode))
return ERR_PTR(-ENOMEM);
/* If this is a freshly allocated inode, need to read it now. */
if (inode->i_state & I_NEW)
inode = ntfs_read_mft(inode, name, ref);
else if (ref->seq != ntfs_i(inode)->mi.mrec->seq) {
/* inode overlaps? */
make_bad_inode(inode);
}
return inode;
}
enum get_block_ctx {
GET_BLOCK_GENERAL = 0,
GET_BLOCK_WRITE_BEGIN = 1,
GET_BLOCK_DIRECT_IO_R = 2,
GET_BLOCK_DIRECT_IO_W = 3,
GET_BLOCK_BMAP = 4,
};
static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo,
struct buffer_head *bh, int create,
enum get_block_ctx ctx)
{
struct super_block *sb = inode->i_sb;
struct ntfs_sb_info *sbi = sb->s_fs_info;
struct ntfs_inode *ni = ntfs_i(inode);
struct page *page = bh->b_page;
u8 cluster_bits = sbi->cluster_bits;
u32 block_size = sb->s_blocksize;
u64 bytes, lbo, valid;
u32 off;
int err;
CLST vcn, lcn, len;
bool new;
/*clear previous state*/
clear_buffer_new(bh);
clear_buffer_uptodate(bh);
/* direct write uses 'create=0'*/
if (!create && vbo >= ni->i_valid) {
/* out of valid */
return 0;
}
if (vbo >= inode->i_size) {
/* out of size */
return 0;
}
if (is_resident(ni)) {
ni_lock(ni);
err = attr_data_read_resident(ni, page);
ni_unlock(ni);
if (!err)
set_buffer_uptodate(bh);
bh->b_size = block_size;
return err;
}
vcn = vbo >> cluster_bits;
off = vbo & sbi->cluster_mask;
new = false;
err = attr_data_get_block(ni, vcn, 1, &lcn, &len, create ? &new : NULL);
if (err)
goto out;
if (!len)
return 0;
bytes = ((u64)len << cluster_bits) - off;
if (lcn == SPARSE_LCN) {
if (!create) {
if (bh->b_size > bytes)
bh->b_size = bytes;
return 0;
}
WARN_ON(1);
}
if (new) {
set_buffer_new(bh);
if ((len << cluster_bits) > block_size)
ntfs_sparse_cluster(inode, page, vcn, len);
}
lbo = ((u64)lcn << cluster_bits) + off;
set_buffer_mapped(bh);
bh->b_bdev = sb->s_bdev;
bh->b_blocknr = lbo >> sb->s_blocksize_bits;
valid = ni->i_valid;
if (ctx == GET_BLOCK_DIRECT_IO_W) {
/*ntfs_direct_IO will update ni->i_valid */
if (vbo >= valid)
set_buffer_new(bh);
} else if (create) {
/*normal write*/
if (bytes > bh->b_size)
bytes = bh->b_size;
if (vbo >= valid)
set_buffer_new(bh);
if (vbo + bytes > valid) {
ni->i_valid = vbo + bytes;
mark_inode_dirty(inode);
}
} else if (vbo >= valid) {
/* read out of valid data*/
/* should never be here 'cause already checked */
clear_buffer_mapped(bh);
} else if (vbo + bytes <= valid) {
/* normal read */
} else if (vbo + block_size <= valid) {
/* normal short read */
bytes = block_size;
} else {
/*
* read across valid size: vbo < valid && valid < vbo + block_size
*/
bytes = block_size;
if (page) {
u32 voff = valid - vbo;
bh->b_size = block_size;
off = vbo & (PAGE_SIZE - 1);
set_bh_page(bh, page, off);
ll_rw_block(REQ_OP_READ, 0, 1, &bh);
wait_on_buffer(bh);
if (!buffer_uptodate(bh)) {
err = -EIO;
goto out;
}
zero_user_segment(page, off + voff, off + block_size);
}
}
if (bh->b_size > bytes)
bh->b_size = bytes;
#ifndef __LP64__
if (ctx == GET_BLOCK_DIRECT_IO_W || ctx == GET_BLOCK_DIRECT_IO_R) {
static_assert(sizeof(size_t) < sizeof(loff_t));
if (bytes > 0x40000000u)
bh->b_size = 0x40000000u;
}
#endif
return 0;
out:
return err;
}
int ntfs_get_block(struct inode *inode, sector_t vbn,
struct buffer_head *bh_result, int create)
{
return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
bh_result, create, GET_BLOCK_GENERAL);
}
static int ntfs_get_block_bmap(struct inode *inode, sector_t vsn,
struct buffer_head *bh_result, int create)
{
return ntfs_get_block_vbo(inode,
(u64)vsn << inode->i_sb->s_blocksize_bits,
bh_result, create, GET_BLOCK_BMAP);
}
static sector_t ntfs_bmap(struct address_space *mapping, sector_t block)
{
return generic_block_bmap(mapping, block, ntfs_get_block_bmap);
}
static int ntfs_readpage(struct file *file, struct page *page)
{
int err;
struct address_space *mapping = page->mapping;
struct inode *inode = mapping->host;
struct ntfs_inode *ni = ntfs_i(inode);
if (is_resident(ni)) {
ni_lock(ni);
err = attr_data_read_resident(ni, page);
ni_unlock(ni);
if (err != E_NTFS_NONRESIDENT) {
unlock_page(page);
return err;
}
}
if (is_compressed(ni)) {
ni_lock(ni);
err = ni_readpage_cmpr(ni, page);
ni_unlock(ni);
return err;
}
/* normal + sparse files */
return mpage_readpage(page, ntfs_get_block);
}
static void ntfs_readahead(struct readahead_control *rac)
{
struct address_space *mapping = rac->mapping;
struct inode *inode = mapping->host;
struct ntfs_inode *ni = ntfs_i(inode);
u64 valid;
loff_t pos;
if (is_resident(ni)) {
/* no readahead for resident */
return;
}
if (is_compressed(ni)) {
/* no readahead for compressed */
return;
}
valid = ni->i_valid;
pos = readahead_pos(rac);
if (valid < i_size_read(inode) && pos <= valid &&
valid < pos + readahead_length(rac)) {
/* range cross 'valid'. read it page by page */
return;
}
mpage_readahead(rac, ntfs_get_block);
}
static int ntfs_get_block_direct_IO_R(struct inode *inode, sector_t iblock,
struct buffer_head *bh_result, int create)
{
return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
bh_result, create, GET_BLOCK_DIRECT_IO_R);
}
static int ntfs_get_block_direct_IO_W(struct inode *inode, sector_t iblock,
struct buffer_head *bh_result, int create)
{
return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
bh_result, create, GET_BLOCK_DIRECT_IO_W);
}
static ssize_t ntfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
{
struct file *file = iocb->ki_filp;
struct address_space *mapping = file->f_mapping;
struct inode *inode = mapping->host;
struct ntfs_inode *ni = ntfs_i(inode);
loff_t vbo = iocb->ki_pos;
loff_t end;
int wr = iov_iter_rw(iter) & WRITE;
loff_t valid;
ssize_t ret;
if (is_resident(ni)) {
/*switch to buffered write*/
ret = 0;
goto out;
}
ret = blockdev_direct_IO(iocb, inode, iter,
wr ? ntfs_get_block_direct_IO_W
: ntfs_get_block_direct_IO_R);
if (ret <= 0)
goto out;
end = vbo + ret;
valid = ni->i_valid;
if (wr) {
if (end > valid && !S_ISBLK(inode->i_mode)) {
ni->i_valid = end;
mark_inode_dirty(inode);
}
} else if (vbo < valid && valid < end) {
/* fix page */
iov_iter_revert(iter, end - valid);
iov_iter_zero(end - valid, iter);
}
out:
return ret;
}
int ntfs_set_size(struct inode *inode, u64 new_size)
{
struct super_block *sb = inode->i_sb;
struct ntfs_sb_info *sbi = sb->s_fs_info;
struct ntfs_inode *ni = ntfs_i(inode);
int err;
/* Check for maximum file size */
if (is_sparsed(ni) || is_compressed(ni)) {
if (new_size > sbi->maxbytes_sparse) {
err = -EFBIG;
goto out;
}
} else if (new_size > sbi->maxbytes) {
err = -EFBIG;
goto out;
}
ni_lock(ni);
down_write(&ni->file.run_lock);
err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size,
&ni->i_valid, true, NULL);
up_write(&ni->file.run_lock);
ni_unlock(ni);
mark_inode_dirty(inode);
out:
return err;
}
static int ntfs_writepage(struct page *page, struct writeback_control *wbc)
{
struct address_space *mapping = page->mapping;
struct inode *inode = mapping->host;
struct ntfs_inode *ni = ntfs_i(inode);
int err;
if (is_resident(ni)) {
ni_lock(ni);
err = attr_data_write_resident(ni, page);
ni_unlock(ni);
if (err != E_NTFS_NONRESIDENT) {
unlock_page(page);
return err;
}
}
return block_write_full_page(page, ntfs_get_block, wbc);
}
static int ntfs_writepages(struct address_space *mapping,
struct writeback_control *wbc)
{
struct inode *inode = mapping->host;
struct ntfs_inode *ni = ntfs_i(inode);
/* redirect call to 'ntfs_writepage' for resident files*/
get_block_t *get_block = is_resident(ni) ? NULL : &ntfs_get_block;
return mpage_writepages(mapping, wbc, get_block);
}
static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn,
struct buffer_head *bh_result, int create)
{
return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
bh_result, create, GET_BLOCK_WRITE_BEGIN);
}
static int ntfs_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, u32 len, u32 flags, struct page **pagep,
void **fsdata)
{
int err;
struct inode *inode = mapping->host;
struct ntfs_inode *ni = ntfs_i(inode);
*pagep = NULL;
if (is_resident(ni)) {
struct page *page = grab_cache_page_write_begin(
mapping, pos >> PAGE_SHIFT, flags);
if (!page) {
err = -ENOMEM;
goto out;
}
ni_lock(ni);
err = attr_data_read_resident(ni, page);
ni_unlock(ni);
if (!err) {
*pagep = page;
goto out;
}
unlock_page(page);
put_page(page);
if (err != E_NTFS_NONRESIDENT)
goto out;
}
err = block_write_begin(mapping, pos, len, flags, pagep,
ntfs_get_block_write_begin);
out:
return err;
}
/* address_space_operations::write_end */
static int ntfs_write_end(struct file *file, struct address_space *mapping,
loff_t pos, u32 len, u32 copied, struct page *page,
void *fsdata)
{
struct inode *inode = mapping->host;
struct ntfs_inode *ni = ntfs_i(inode);
u64 valid = ni->i_valid;
bool dirty = false;
int err;
if (is_resident(ni)) {
ni_lock(ni);
err = attr_data_write_resident(ni, page);
ni_unlock(ni);
if (!err) {
dirty = true;
/* clear any buffers in page*/
if (page_has_buffers(page)) {
struct buffer_head *head, *bh;
bh = head = page_buffers(page);
do {
clear_buffer_dirty(bh);
clear_buffer_mapped(bh);
set_buffer_uptodate(bh);
} while (head != (bh = bh->b_this_page));
}
SetPageUptodate(page);
err = copied;
}
unlock_page(page);
put_page(page);
} else {
err = generic_write_end(file, mapping, pos, len, copied, page,
fsdata);
}
if (err >= 0) {
if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) {
inode->i_ctime = inode->i_mtime = current_time(inode);
ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE;
dirty = true;
}
if (valid != ni->i_valid) {
/* ni->i_valid is changed in ntfs_get_block_vbo */
dirty = true;
}
if (dirty)
mark_inode_dirty(inode);
}
return err;
}
int reset_log_file(struct inode *inode)
{
int err;
loff_t pos = 0;
u32 log_size = inode->i_size;
struct address_space *mapping = inode->i_mapping;
for (;;) {
u32 len;
void *kaddr;
struct page *page;
len = pos + PAGE_SIZE > log_size ? (log_size - pos) : PAGE_SIZE;
err = block_write_begin(mapping, pos, len, 0, &page,
ntfs_get_block_write_begin);
if (err)
goto out;
kaddr = kmap_atomic(page);
memset(kaddr, -1, len);
kunmap_atomic(kaddr);
flush_dcache_page(page);
err = block_write_end(NULL, mapping, pos, len, len, page, NULL);
if (err < 0)
goto out;
pos += len;
if (pos >= log_size)
break;
balance_dirty_pages_ratelimited(mapping);
}
out:
mark_inode_dirty_sync(inode);
return err;
}