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linux/fs/ntfs/file.c

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/*
* file.c - NTFS kernel file operations. Part of the Linux-NTFS project.
*
* Copyright (c) 2001-2006 Anton Altaparmakov
*
* This program/include file is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as published
* by the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program/include file 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.
*
* You should have received a copy of the GNU General Public License
* along with this program (in the main directory of the Linux-NTFS
* distribution in the file COPYING); if not, write to the Free Software
* Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/buffer_head.h>
#include <linux/pagemap.h>
#include <linux/pagevec.h>
#include <linux/sched.h>
#include <linux/swap.h>
#include <linux/uio.h>
#include <linux/writeback.h>
#include <asm/page.h>
#include <asm/uaccess.h>
#include "attrib.h"
#include "bitmap.h"
#include "inode.h"
#include "debug.h"
#include "lcnalloc.h"
#include "malloc.h"
#include "mft.h"
#include "ntfs.h"
/**
* ntfs_file_open - called when an inode is about to be opened
* @vi: inode to be opened
* @filp: file structure describing the inode
*
* Limit file size to the page cache limit on architectures where unsigned long
* is 32-bits. This is the most we can do for now without overflowing the page
* cache page index. Doing it this way means we don't run into problems because
* of existing too large files. It would be better to allow the user to read
* the beginning of the file but I doubt very much anyone is going to hit this
* check on a 32-bit architecture, so there is no point in adding the extra
* complexity required to support this.
*
* On 64-bit architectures, the check is hopefully optimized away by the
* compiler.
*
* After the check passes, just call generic_file_open() to do its work.
*/
static int ntfs_file_open(struct inode *vi, struct file *filp)
{
if (sizeof(unsigned long) < 8) {
if (i_size_read(vi) > MAX_LFS_FILESIZE)
return -EFBIG;
}
return generic_file_open(vi, filp);
}
#ifdef NTFS_RW
/**
* ntfs_attr_extend_initialized - extend the initialized size of an attribute
* @ni: ntfs inode of the attribute to extend
* @new_init_size: requested new initialized size in bytes
* @cached_page: store any allocated but unused page here
* @lru_pvec: lru-buffering pagevec of the caller
*
* Extend the initialized size of an attribute described by the ntfs inode @ni
* to @new_init_size bytes. This involves zeroing any non-sparse space between
* the old initialized size and @new_init_size both in the page cache and on
* disk (if relevant complete pages are already uptodate in the page cache then
* these are simply marked dirty).
*
* As a side-effect, the file size (vfs inode->i_size) may be incremented as,
* in the resident attribute case, it is tied to the initialized size and, in
* the non-resident attribute case, it may not fall below the initialized size.
*
* Note that if the attribute is resident, we do not need to touch the page
* cache at all. This is because if the page cache page is not uptodate we
* bring it uptodate later, when doing the write to the mft record since we
* then already have the page mapped. And if the page is uptodate, the
* non-initialized region will already have been zeroed when the page was
* brought uptodate and the region may in fact already have been overwritten
* with new data via mmap() based writes, so we cannot just zero it. And since
* POSIX specifies that the behaviour of resizing a file whilst it is mmap()ped
* is unspecified, we choose not to do zeroing and thus we do not need to touch
* the page at all. For a more detailed explanation see ntfs_truncate() in
* fs/ntfs/inode.c.
*
* @cached_page and @lru_pvec are just optimizations for dealing with multiple
* pages.
*
* Return 0 on success and -errno on error. In the case that an error is
* encountered it is possible that the initialized size will already have been
* incremented some way towards @new_init_size but it is guaranteed that if
* this is the case, the necessary zeroing will also have happened and that all
* metadata is self-consistent.
*
* Locking: i_mutex on the vfs inode corrseponsind to the ntfs inode @ni must be
* held by the caller.
*/
static int ntfs_attr_extend_initialized(ntfs_inode *ni, const s64 new_init_size,
struct page **cached_page, struct pagevec *lru_pvec)
{
s64 old_init_size;
loff_t old_i_size;
pgoff_t index, end_index;
unsigned long flags;
struct inode *vi = VFS_I(ni);
ntfs_inode *base_ni;
MFT_RECORD *m = NULL;
ATTR_RECORD *a;
ntfs_attr_search_ctx *ctx = NULL;
struct address_space *mapping;
struct page *page = NULL;
u8 *kattr;
int err;
u32 attr_len;
read_lock_irqsave(&ni->size_lock, flags);
old_init_size = ni->initialized_size;
old_i_size = i_size_read(vi);
BUG_ON(new_init_size > ni->allocated_size);
read_unlock_irqrestore(&ni->size_lock, flags);
ntfs_debug("Entering for i_ino 0x%lx, attribute type 0x%x, "
"old_initialized_size 0x%llx, "
"new_initialized_size 0x%llx, i_size 0x%llx.",
vi->i_ino, (unsigned)le32_to_cpu(ni->type),
(unsigned long long)old_init_size,
(unsigned long long)new_init_size, old_i_size);
if (!NInoAttr(ni))
base_ni = ni;
else
base_ni = ni->ext.base_ntfs_ino;
/* Use goto to reduce indentation and we need the label below anyway. */
if (NInoNonResident(ni))
goto do_non_resident_extend;
BUG_ON(old_init_size != old_i_size);
m = map_mft_record(base_ni);
if (IS_ERR(m)) {
err = PTR_ERR(m);
m = NULL;
goto err_out;
}
ctx = ntfs_attr_get_search_ctx(base_ni, m);
if (unlikely(!ctx)) {
err = -ENOMEM;
goto err_out;
}
err = ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
CASE_SENSITIVE, 0, NULL, 0, ctx);
if (unlikely(err)) {
if (err == -ENOENT)
err = -EIO;
goto err_out;
}
m = ctx->mrec;
a = ctx->attr;
BUG_ON(a->non_resident);
/* The total length of the attribute value. */
attr_len = le32_to_cpu(a->data.resident.value_length);
BUG_ON(old_i_size != (loff_t)attr_len);
/*
* Do the zeroing in the mft record and update the attribute size in
* the mft record.
*/
kattr = (u8*)a + le16_to_cpu(a->data.resident.value_offset);
memset(kattr + attr_len, 0, new_init_size - attr_len);
a->data.resident.value_length = cpu_to_le32((u32)new_init_size);
/* Finally, update the sizes in the vfs and ntfs inodes. */
write_lock_irqsave(&ni->size_lock, flags);
i_size_write(vi, new_init_size);
ni->initialized_size = new_init_size;
write_unlock_irqrestore(&ni->size_lock, flags);
goto done;
do_non_resident_extend:
/*
* If the new initialized size @new_init_size exceeds the current file
* size (vfs inode->i_size), we need to extend the file size to the
* new initialized size.
*/
if (new_init_size > old_i_size) {
m = map_mft_record(base_ni);
if (IS_ERR(m)) {
err = PTR_ERR(m);
m = NULL;
goto err_out;
}
ctx = ntfs_attr_get_search_ctx(base_ni, m);
if (unlikely(!ctx)) {
err = -ENOMEM;
goto err_out;
}
err = ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
CASE_SENSITIVE, 0, NULL, 0, ctx);
if (unlikely(err)) {
if (err == -ENOENT)
err = -EIO;
goto err_out;
}
m = ctx->mrec;
a = ctx->attr;
BUG_ON(!a->non_resident);
BUG_ON(old_i_size != (loff_t)
sle64_to_cpu(a->data.non_resident.data_size));
a->data.non_resident.data_size = cpu_to_sle64(new_init_size);
flush_dcache_mft_record_page(ctx->ntfs_ino);
mark_mft_record_dirty(ctx->ntfs_ino);
/* Update the file size in the vfs inode. */
i_size_write(vi, new_init_size);
ntfs_attr_put_search_ctx(ctx);
ctx = NULL;
unmap_mft_record(base_ni);
m = NULL;
}
mapping = vi->i_mapping;
index = old_init_size >> PAGE_CACHE_SHIFT;
end_index = (new_init_size + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
do {
/*
* Read the page. If the page is not present, this will zero
* the uninitialized regions for us.
*/
page = read_mapping_page(mapping, index, NULL);
if (IS_ERR(page)) {
err = PTR_ERR(page);
goto init_err_out;
}
wait_on_page_locked(page);
if (unlikely(!PageUptodate(page) || PageError(page))) {
page_cache_release(page);
err = -EIO;
goto init_err_out;
}
/*
* Update the initialized size in the ntfs inode. This is
* enough to make ntfs_writepage() work.
*/
write_lock_irqsave(&ni->size_lock, flags);
ni->initialized_size = (s64)(index + 1) << PAGE_CACHE_SHIFT;
if (ni->initialized_size > new_init_size)
ni->initialized_size = new_init_size;
write_unlock_irqrestore(&ni->size_lock, flags);
/* Set the page dirty so it gets written out. */
set_page_dirty(page);
page_cache_release(page);
/*
* Play nice with the vm and the rest of the system. This is
* very much needed as we can potentially be modifying the
* initialised size from a very small value to a really huge
* value, e.g.
* f = open(somefile, O_TRUNC);
* truncate(f, 10GiB);
* seek(f, 10GiB);
* write(f, 1);
* And this would mean we would be marking dirty hundreds of
* thousands of pages or as in the above example more than
* two and a half million pages!
*
* TODO: For sparse pages could optimize this workload by using
* the FsMisc / MiscFs page bit as a "PageIsSparse" bit. This
* would be set in readpage for sparse pages and here we would
* not need to mark dirty any pages which have this bit set.
* The only caveat is that we have to clear the bit everywhere
* where we allocate any clusters that lie in the page or that
* contain the page.
*
* TODO: An even greater optimization would be for us to only
* call readpage() on pages which are not in sparse regions as
* determined from the runlist. This would greatly reduce the
* number of pages we read and make dirty in the case of sparse
* files.
*/
balance_dirty_pages_ratelimited(mapping);
cond_resched();
} while (++index < end_index);
read_lock_irqsave(&ni->size_lock, flags);
BUG_ON(ni->initialized_size != new_init_size);
read_unlock_irqrestore(&ni->size_lock, flags);
/* Now bring in sync the initialized_size in the mft record. */
m = map_mft_record(base_ni);
if (IS_ERR(m)) {
err = PTR_ERR(m);
m = NULL;
goto init_err_out;
}
ctx = ntfs_attr_get_search_ctx(base_ni, m);
if (unlikely(!ctx)) {
err = -ENOMEM;
goto init_err_out;
}
err = ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
CASE_SENSITIVE, 0, NULL, 0, ctx);
if (unlikely(err)) {
if (err == -ENOENT)
err = -EIO;
goto init_err_out;
}
m = ctx->mrec;
a = ctx->attr;
BUG_ON(!a->non_resident);
a->data.non_resident.initialized_size = cpu_to_sle64(new_init_size);
done:
flush_dcache_mft_record_page(ctx->ntfs_ino);
mark_mft_record_dirty(ctx->ntfs_ino);
if (ctx)
ntfs_attr_put_search_ctx(ctx);
if (m)
unmap_mft_record(base_ni);
ntfs_debug("Done, initialized_size 0x%llx, i_size 0x%llx.",
(unsigned long long)new_init_size, i_size_read(vi));
return 0;
init_err_out:
write_lock_irqsave(&ni->size_lock, flags);
ni->initialized_size = old_init_size;
write_unlock_irqrestore(&ni->size_lock, flags);
err_out:
if (ctx)
ntfs_attr_put_search_ctx(ctx);
if (m)
unmap_mft_record(base_ni);
ntfs_debug("Failed. Returning error code %i.", err);
return err;
}
/**
* ntfs_fault_in_pages_readable -
*
* Fault a number of userspace pages into pagetables.
*
* Unlike include/linux/pagemap.h::fault_in_pages_readable(), this one copes
* with more than two userspace pages as well as handling the single page case
* elegantly.
*
* If you find this difficult to understand, then think of the while loop being
* the following code, except that we do without the integer variable ret:
*
* do {
* ret = __get_user(c, uaddr);
* uaddr += PAGE_SIZE;
* } while (!ret && uaddr < end);
*
* Note, the final __get_user() may well run out-of-bounds of the user buffer,
* but _not_ out-of-bounds of the page the user buffer belongs to, and since
* this is only a read and not a write, and since it is still in the same page,
* it should not matter and this makes the code much simpler.
*/
static inline void ntfs_fault_in_pages_readable(const char __user *uaddr,
int bytes)
{
const char __user *end;
volatile char c;
/* Set @end to the first byte outside the last page we care about. */
end = (const char __user*)PAGE_ALIGN((ptrdiff_t __user)uaddr + bytes);
while (!__get_user(c, uaddr) && (uaddr += PAGE_SIZE, uaddr < end))
;
}
/**
* ntfs_fault_in_pages_readable_iovec -
*
* Same as ntfs_fault_in_pages_readable() but operates on an array of iovecs.
*/
static inline void ntfs_fault_in_pages_readable_iovec(const struct iovec *iov,
size_t iov_ofs, int bytes)
{
do {
const char __user *buf;
unsigned len;
buf = iov->iov_base + iov_ofs;
len = iov->iov_len - iov_ofs;
if (len > bytes)
len = bytes;
ntfs_fault_in_pages_readable(buf, len);
bytes -= len;
iov++;
iov_ofs = 0;
} while (bytes);
}
/**
* __ntfs_grab_cache_pages - obtain a number of locked pages
* @mapping: address space mapping from which to obtain page cache pages
* @index: starting index in @mapping at which to begin obtaining pages
* @nr_pages: number of page cache pages to obtain
* @pages: array of pages in which to return the obtained page cache pages
* @cached_page: allocated but as yet unused page
* @lru_pvec: lru-buffering pagevec of caller
*
* Obtain @nr_pages locked page cache pages from the mapping @maping and
* starting at index @index.
*
* If a page is newly created, increment its refcount and add it to the
* caller's lru-buffering pagevec @lru_pvec.
*
* This is the same as mm/filemap.c::__grab_cache_page(), except that @nr_pages
* are obtained at once instead of just one page and that 0 is returned on
* success and -errno on error.
*
* Note, the page locks are obtained in ascending page index order.
*/
static inline int __ntfs_grab_cache_pages(struct address_space *mapping,
pgoff_t index, const unsigned nr_pages, struct page **pages,
struct page **cached_page, struct pagevec *lru_pvec)
{
int err, nr;
BUG_ON(!nr_pages);
err = nr = 0;
do {
pages[nr] = find_lock_page(mapping, index);
if (!pages[nr]) {
if (!*cached_page) {
*cached_page = page_cache_alloc(mapping);
if (unlikely(!*cached_page)) {
err = -ENOMEM;
goto err_out;
}
}
err = add_to_page_cache(*cached_page, mapping, index,
GFP_KERNEL);
if (unlikely(err)) {
if (err == -EEXIST)
continue;
goto err_out;
}
pages[nr] = *cached_page;
page_cache_get(*cached_page);
if (unlikely(!pagevec_add(lru_pvec, *cached_page)))
__pagevec_lru_add(lru_pvec);
*cached_page = NULL;
}
index++;
nr++;
} while (nr < nr_pages);
out:
return err;
err_out:
while (nr > 0) {
unlock_page(pages[--nr]);
page_cache_release(pages[nr]);
}
goto out;
}
static inline int ntfs_submit_bh_for_read(struct buffer_head *bh)
{
lock_buffer(bh);
get_bh(bh);
bh->b_end_io = end_buffer_read_sync;
return submit_bh(READ, bh);
}
/**
* ntfs_prepare_pages_for_non_resident_write - prepare pages for receiving data
* @pages: array of destination pages
* @nr_pages: number of pages in @pages
* @pos: byte position in file at which the write begins
* @bytes: number of bytes to be written
*
* This is called for non-resident attributes from ntfs_file_buffered_write()
* with i_mutex held on the inode (@pages[0]->mapping->host). There are
* @nr_pages pages in @pages which are locked but not kmap()ped. The source
* data has not yet been copied into the @pages.
*
* Need to fill any holes with actual clusters, allocate buffers if necessary,
* ensure all the buffers are mapped, and bring uptodate any buffers that are
* only partially being written to.
*
* If @nr_pages is greater than one, we are guaranteed that the cluster size is
* greater than PAGE_CACHE_SIZE, that all pages in @pages are entirely inside
* the same cluster and that they are the entirety of that cluster, and that
* the cluster is sparse, i.e. we need to allocate a cluster to fill the hole.
*
* i_size is not to be modified yet.
*
* Return 0 on success or -errno on error.
*/
static int ntfs_prepare_pages_for_non_resident_write(struct page **pages,
unsigned nr_pages, s64 pos, size_t bytes)
{
VCN vcn, highest_vcn = 0, cpos, cend, bh_cpos, bh_cend;
LCN lcn;
s64 bh_pos, vcn_len, end, initialized_size;
sector_t lcn_block;
struct page *page;
struct inode *vi;
ntfs_inode *ni, *base_ni = NULL;
ntfs_volume *vol;
runlist_element *rl, *rl2;
struct buffer_head *bh, *head, *wait[2], **wait_bh = wait;
ntfs_attr_search_ctx *ctx = NULL;
MFT_RECORD *m = NULL;
ATTR_RECORD *a = NULL;
unsigned long flags;
u32 attr_rec_len = 0;
unsigned blocksize, u;
int err, mp_size;
BOOL rl_write_locked, was_hole, is_retry;
unsigned char blocksize_bits;
struct {
u8 runlist_merged:1;
u8 mft_attr_mapped:1;
u8 mp_rebuilt:1;
u8 attr_switched:1;
} status = { 0, 0, 0, 0 };
BUG_ON(!nr_pages);
BUG_ON(!pages);
BUG_ON(!*pages);
vi = pages[0]->mapping->host;
ni = NTFS_I(vi);
vol = ni->vol;
ntfs_debug("Entering for inode 0x%lx, attribute type 0x%x, start page "
"index 0x%lx, nr_pages 0x%x, pos 0x%llx, bytes 0x%zx.",
vi->i_ino, ni->type, pages[0]->index, nr_pages,
(long long)pos, bytes);
blocksize = vol->sb->s_blocksize;
blocksize_bits = vol->sb->s_blocksize_bits;
u = 0;
do {
struct page *page = pages[u];
/*
* create_empty_buffers() will create uptodate/dirty buffers if
* the page is uptodate/dirty.
*/
if (!page_has_buffers(page)) {
create_empty_buffers(page, blocksize, 0);
if (unlikely(!page_has_buffers(page)))
return -ENOMEM;
}
} while (++u < nr_pages);
rl_write_locked = FALSE;
rl = NULL;
err = 0;
vcn = lcn = -1;
vcn_len = 0;
lcn_block = -1;
was_hole = FALSE;
cpos = pos >> vol->cluster_size_bits;
end = pos + bytes;
cend = (end + vol->cluster_size - 1) >> vol->cluster_size_bits;
/*
* Loop over each page and for each page over each buffer. Use goto to
* reduce indentation.
*/
u = 0;
do_next_page:
page = pages[u];
bh_pos = (s64)page->index << PAGE_CACHE_SHIFT;
bh = head = page_buffers(page);
do {
VCN cdelta;
s64 bh_end;
unsigned bh_cofs;
/* Clear buffer_new on all buffers to reinitialise state. */
if (buffer_new(bh))
clear_buffer_new(bh);
bh_end = bh_pos + blocksize;
bh_cpos = bh_pos >> vol->cluster_size_bits;
bh_cofs = bh_pos & vol->cluster_size_mask;
if (buffer_mapped(bh)) {
/*
* The buffer is already mapped. If it is uptodate,
* ignore it.
*/
if (buffer_uptodate(bh))
continue;
/*
* The buffer is not uptodate. If the page is uptodate
* set the buffer uptodate and otherwise ignore it.
*/
if (PageUptodate(page)) {
set_buffer_uptodate(bh);
continue;
}
/*
* Neither the page nor the buffer are uptodate. If
* the buffer is only partially being written to, we
* need to read it in before the write, i.e. now.
*/
if ((bh_pos < pos && bh_end > pos) ||
(bh_pos < end && bh_end > end)) {
/*
* If the buffer is fully or partially within
* the initialized size, do an actual read.
* Otherwise, simply zero the buffer.
*/
read_lock_irqsave(&ni->size_lock, flags);
initialized_size = ni->initialized_size;
read_unlock_irqrestore(&ni->size_lock, flags);
if (bh_pos < initialized_size) {
ntfs_submit_bh_for_read(bh);
*wait_bh++ = bh;
} else {
u8 *kaddr = kmap_atomic(page, KM_USER0);
memset(kaddr + bh_offset(bh), 0,
blocksize);
kunmap_atomic(kaddr, KM_USER0);
flush_dcache_page(page);
set_buffer_uptodate(bh);
}
}
continue;
}
/* Unmapped buffer. Need to map it. */
bh->b_bdev = vol->sb->s_bdev;
/*
* If the current buffer is in the same clusters as the map
* cache, there is no need to check the runlist again. The
* map cache is made up of @vcn, which is the first cached file
* cluster, @vcn_len which is the number of cached file
* clusters, @lcn is the device cluster corresponding to @vcn,
* and @lcn_block is the block number corresponding to @lcn.
*/
cdelta = bh_cpos - vcn;
if (likely(!cdelta || (cdelta > 0 && cdelta < vcn_len))) {
map_buffer_cached:
BUG_ON(lcn < 0);
bh->b_blocknr = lcn_block +
(cdelta << (vol->cluster_size_bits -
blocksize_bits)) +
(bh_cofs >> blocksize_bits);
set_buffer_mapped(bh);
/*
* If the page is uptodate so is the buffer. If the
* buffer is fully outside the write, we ignore it if
* it was already allocated and we mark it dirty so it
* gets written out if we allocated it. On the other
* hand, if we allocated the buffer but we are not
* marking it dirty we set buffer_new so we can do
* error recovery.
*/
if (PageUptodate(page)) {
if (!buffer_uptodate(bh))
set_buffer_uptodate(bh);
if (unlikely(was_hole)) {
/* We allocated the buffer. */
unmap_underlying_metadata(bh->b_bdev,
bh->b_blocknr);
if (bh_end <= pos || bh_pos >= end)
mark_buffer_dirty(bh);
else
set_buffer_new(bh);
}
continue;
}
/* Page is _not_ uptodate. */
if (likely(!was_hole)) {
/*
* Buffer was already allocated. If it is not
* uptodate and is only partially being written
* to, we need to read it in before the write,
* i.e. now.
*/
if (!buffer_uptodate(bh) && bh_pos < end &&
bh_end > pos &&
(bh_pos < pos ||
bh_end > end)) {
/*
* If the buffer is fully or partially
* within the initialized size, do an
* actual read. Otherwise, simply zero
* the buffer.
*/
read_lock_irqsave(&ni->size_lock,
flags);
initialized_size = ni->initialized_size;
read_unlock_irqrestore(&ni->size_lock,
flags);
if (bh_pos < initialized_size) {
ntfs_submit_bh_for_read(bh);
*wait_bh++ = bh;
} else {
u8 *kaddr = kmap_atomic(page,
KM_USER0);
memset(kaddr + bh_offset(bh),
0, blocksize);
kunmap_atomic(kaddr, KM_USER0);
flush_dcache_page(page);
set_buffer_uptodate(bh);
}
}
continue;
}
/* We allocated the buffer. */
unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr);
/*
* If the buffer is fully outside the write, zero it,
* set it uptodate, and mark it dirty so it gets
* written out. If it is partially being written to,
* zero region surrounding the write but leave it to
* commit write to do anything else. Finally, if the
* buffer is fully being overwritten, do nothing.
*/
if (bh_end <= pos || bh_pos >= end) {
if (!buffer_uptodate(bh)) {
u8 *kaddr = kmap_atomic(page, KM_USER0);
memset(kaddr + bh_offset(bh), 0,
blocksize);
kunmap_atomic(kaddr, KM_USER0);
flush_dcache_page(page);
set_buffer_uptodate(bh);
}
mark_buffer_dirty(bh);
continue;
}
set_buffer_new(bh);
if (!buffer_uptodate(bh) &&
(bh_pos < pos || bh_end > end)) {
u8 *kaddr;
unsigned pofs;
kaddr = kmap_atomic(page, KM_USER0);
if (bh_pos < pos) {
pofs = bh_pos & ~PAGE_CACHE_MASK;
memset(kaddr + pofs, 0, pos - bh_pos);
}
if (bh_end > end) {
pofs = end & ~PAGE_CACHE_MASK;
memset(kaddr + pofs, 0, bh_end - end);
}
kunmap_atomic(kaddr, KM_USER0);
flush_dcache_page(page);
}
continue;
}
/*
* Slow path: this is the first buffer in the cluster. If it
* is outside allocated size and is not uptodate, zero it and
* set it uptodate.
*/
read_lock_irqsave(&ni->size_lock, flags);
initialized_size = ni->allocated_size;
read_unlock_irqrestore(&ni->size_lock, flags);
if (bh_pos > initialized_size) {
if (PageUptodate(page)) {
if (!buffer_uptodate(bh))
set_buffer_uptodate(bh);
} else if (!buffer_uptodate(bh)) {
u8 *kaddr = kmap_atomic(page, KM_USER0);
memset(kaddr + bh_offset(bh), 0, blocksize);
kunmap_atomic(kaddr, KM_USER0);
flush_dcache_page(page);
set_buffer_uptodate(bh);
}
continue;
}
is_retry = FALSE;
if (!rl) {
down_read(&ni->runlist.lock);
retry_remap:
rl = ni->runlist.rl;
}
if (likely(rl != NULL)) {
/* Seek to element containing target cluster. */
while (rl->length && rl[1].vcn <= bh_cpos)
rl++;
lcn = ntfs_rl_vcn_to_lcn(rl, bh_cpos);
if (likely(lcn >= 0)) {
/*
* Successful remap, setup the map cache and
* use that to deal with the buffer.
*/
was_hole = FALSE;
vcn = bh_cpos;
vcn_len = rl[1].vcn - vcn;
lcn_block = lcn << (vol->cluster_size_bits -
blocksize_bits);
cdelta = 0;
/*
* If the number of remaining clusters touched
* by the write is smaller or equal to the
* number of cached clusters, unlock the
* runlist as the map cache will be used from
* now on.
*/
if (likely(vcn + vcn_len >= cend)) {
if (rl_write_locked) {
up_write(&ni->runlist.lock);
rl_write_locked = FALSE;
} else
up_read(&ni->runlist.lock);
rl = NULL;
}
goto map_buffer_cached;
}
} else
lcn = LCN_RL_NOT_MAPPED;
/*
* If it is not a hole and not out of bounds, the runlist is
* probably unmapped so try to map it now.
*/
if (unlikely(lcn != LCN_HOLE && lcn != LCN_ENOENT)) {
if (likely(!is_retry && lcn == LCN_RL_NOT_MAPPED)) {
/* Attempt to map runlist. */
if (!rl_write_locked) {
/*
* We need the runlist locked for
* writing, so if it is locked for
* reading relock it now and retry in
* case it changed whilst we dropped
* the lock.
*/
up_read(&ni->runlist.lock);
down_write(&ni->runlist.lock);
rl_write_locked = TRUE;
goto retry_remap;
}
err = ntfs_map_runlist_nolock(ni, bh_cpos,
NULL);
if (likely(!err)) {
is_retry = TRUE;
goto retry_remap;
}
/*
* If @vcn is out of bounds, pretend @lcn is
* LCN_ENOENT. As long as the buffer is out
* of bounds this will work fine.
*/
if (err == -ENOENT) {
lcn = LCN_ENOENT;
err = 0;
goto rl_not_mapped_enoent;
}
} else
err = -EIO;
/* Failed to map the buffer, even after retrying. */
bh->b_blocknr = -1;
ntfs_error(vol->sb, "Failed to write to inode 0x%lx, "
"attribute type 0x%x, vcn 0x%llx, "
"vcn offset 0x%x, because its "
"location on disk could not be "
"determined%s (error code %i).",
ni->mft_no, ni->type,
(unsigned long long)bh_cpos,
(unsigned)bh_pos &
vol->cluster_size_mask,
is_retry ? " even after retrying" : "",
err);
break;
}
rl_not_mapped_enoent:
/*
* The buffer is in a hole or out of bounds. We need to fill
* the hole, unless the buffer is in a cluster which is not
* touched by the write, in which case we just leave the buffer
* unmapped. This can only happen when the cluster size is
* less than the page cache size.
*/
if (unlikely(vol->cluster_size < PAGE_CACHE_SIZE)) {
bh_cend = (bh_end + vol->cluster_size - 1) >>
vol->cluster_size_bits;
if ((bh_cend <= cpos || bh_cpos >= cend)) {
bh->b_blocknr = -1;
/*
* If the buffer is uptodate we skip it. If it
* is not but the page is uptodate, we can set
* the buffer uptodate. If the page is not
* uptodate, we can clear the buffer and set it
* uptodate. Whether this is worthwhile is
* debatable and this could be removed.
*/
if (PageUptodate(page)) {
if (!buffer_uptodate(bh))
set_buffer_uptodate(bh);
} else if (!buffer_uptodate(bh)) {
u8 *kaddr = kmap_atomic(page, KM_USER0);
memset(kaddr + bh_offset(bh), 0,
blocksize);
kunmap_atomic(kaddr, KM_USER0);
flush_dcache_page(page);
set_buffer_uptodate(bh);
}
continue;
}
}
/*
* Out of bounds buffer is invalid if it was not really out of
* bounds.
*/
BUG_ON(lcn != LCN_HOLE);
/*
* We need the runlist locked for writing, so if it is locked
* for reading relock it now and retry in case it changed
* whilst we dropped the lock.
*/
BUG_ON(!rl);
if (!rl_write_locked) {
up_read(&ni->runlist.lock);
down_write(&ni->runlist.lock);
rl_write_locked = TRUE;
goto retry_remap;
}
/* Find the previous last allocated cluster. */
BUG_ON(rl->lcn != LCN_HOLE);
lcn = -1;
rl2 = rl;
while (--rl2 >= ni->runlist.rl) {
if (rl2->lcn >= 0) {
lcn = rl2->lcn + rl2->length;
break;
}
}
rl2 = ntfs_cluster_alloc(vol, bh_cpos, 1, lcn, DATA_ZONE,
FALSE);
if (IS_ERR(rl2)) {
err = PTR_ERR(rl2);
ntfs_debug("Failed to allocate cluster, error code %i.",
err);
break;
}
lcn = rl2->lcn;
rl = ntfs_runlists_merge(ni->runlist.rl, rl2);
if (IS_ERR(rl)) {
err = PTR_ERR(rl);
if (err != -ENOMEM)
err = -EIO;
if (ntfs_cluster_free_from_rl(vol, rl2)) {
ntfs_error(vol->sb, "Failed to release "
"allocated cluster in error "
"code path. Run chkdsk to "
"recover the lost cluster.");
NVolSetErrors(vol);
}
ntfs_free(rl2);
break;
}
ni->runlist.rl = rl;
status.runlist_merged = 1;
ntfs_debug("Allocated cluster, lcn 0x%llx.",
(unsigned long long)lcn);
/* Map and lock the mft record and get the attribute record. */
if (!NInoAttr(ni))
base_ni = ni;
else
base_ni = ni->ext.base_ntfs_ino;
m = map_mft_record(base_ni);
if (IS_ERR(m)) {
err = PTR_ERR(m);
break;
}
ctx = ntfs_attr_get_search_ctx(base_ni, m);
if (unlikely(!ctx)) {
err = -ENOMEM;
unmap_mft_record(base_ni);
break;
}
status.mft_attr_mapped = 1;
err = ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
CASE_SENSITIVE, bh_cpos, NULL, 0, ctx);
if (unlikely(err)) {
if (err == -ENOENT)
err = -EIO;
break;
}
m = ctx->mrec;
a = ctx->attr;
/*
* Find the runlist element with which the attribute extent
* starts. Note, we cannot use the _attr_ version because we
* have mapped the mft record. That is ok because we know the
* runlist fragment must be mapped already to have ever gotten
* here, so we can just use the _rl_ version.
*/
vcn = sle64_to_cpu(a->data.non_resident.lowest_vcn);
rl2 = ntfs_rl_find_vcn_nolock(rl, vcn);
BUG_ON(!rl2);
BUG_ON(!rl2->length);
BUG_ON(rl2->lcn < LCN_HOLE);
highest_vcn = sle64_to_cpu(a->data.non_resident.highest_vcn);
/*
* If @highest_vcn is zero, calculate the real highest_vcn
* (which can really be zero).
*/
if (!highest_vcn)
highest_vcn = (sle64_to_cpu(
a->data.non_resident.allocated_size) >>
vol->cluster_size_bits) - 1;
/*
* Determine the size of the mapping pairs array for the new
* extent, i.e. the old extent with the hole filled.
*/
mp_size = ntfs_get_size_for_mapping_pairs(vol, rl2, vcn,
highest_vcn);
if (unlikely(mp_size <= 0)) {
if (!(err = mp_size))
err = -EIO;
ntfs_debug("Failed to get size for mapping pairs "
"array, error code %i.", err);
break;
}
/*
* Resize the attribute record to fit the new mapping pairs
* array.
*/
attr_rec_len = le32_to_cpu(a->length);
err = ntfs_attr_record_resize(m, a, mp_size + le16_to_cpu(
a->data.non_resident.mapping_pairs_offset));
if (unlikely(err)) {
BUG_ON(err != -ENOSPC);
// TODO: Deal with this by using the current attribute
// and fill it with as much of the mapping pairs
// array as possible. Then loop over each attribute
// extent rewriting the mapping pairs arrays as we go
// along and if when we reach the end we have not
// enough space, try to resize the last attribute
// extent and if even that fails, add a new attribute
// extent.
// We could also try to resize at each step in the hope
// that we will not need to rewrite every single extent.
// Note, we may need to decompress some extents to fill
// the runlist as we are walking the extents...
ntfs_error(vol->sb, "Not enough space in the mft "
"record for the extended attribute "
"record. This case is not "
"implemented yet.");
err = -EOPNOTSUPP;
break ;
}
status.mp_rebuilt = 1;
/*
* Generate the mapping pairs array directly into the attribute
* record.
*/
err = ntfs_mapping_pairs_build(vol, (u8*)a + le16_to_cpu(
a->data.non_resident.mapping_pairs_offset),
mp_size, rl2, vcn, highest_vcn, NULL);
if (unlikely(err)) {
ntfs_error(vol->sb, "Cannot fill hole in inode 0x%lx, "
"attribute type 0x%x, because building "
"the mapping pairs failed with error "
"code %i.", vi->i_ino,
(unsigned)le32_to_cpu(ni->type), err);
err = -EIO;
break;
}
/* Update the highest_vcn but only if it was not set. */
if (unlikely(!a->data.non_resident.highest_vcn))
a->data.non_resident.highest_vcn =
cpu_to_sle64(highest_vcn);
/*
* If the attribute is sparse/compressed, update the compressed
* size in the ntfs_inode structure and the attribute record.
*/
if (likely(NInoSparse(ni) || NInoCompressed(ni))) {
/*
* If we are not in the first attribute extent, switch
* to it, but first ensure the changes will make it to
* disk later.
*/
if (a->data.non_resident.lowest_vcn) {
flush_dcache_mft_record_page(ctx->ntfs_ino);
mark_mft_record_dirty(ctx->ntfs_ino);
ntfs_attr_reinit_search_ctx(ctx);
err = ntfs_attr_lookup(ni->type, ni->name,
ni->name_len, CASE_SENSITIVE,
0, NULL, 0, ctx);
if (unlikely(err)) {
status.attr_switched = 1;
break;
}
/* @m is not used any more so do not set it. */
a = ctx->attr;
}
write_lock_irqsave(&ni->size_lock, flags);
ni->itype.compressed.size += vol->cluster_size;
a->data.non_resident.compressed_size =
cpu_to_sle64(ni->itype.compressed.size);
write_unlock_irqrestore(&ni->size_lock, flags);
}
/* Ensure the changes make it to disk. */
flush_dcache_mft_record_page(ctx->ntfs_ino);
mark_mft_record_dirty(ctx->ntfs_ino);
ntfs_attr_put_search_ctx(ctx);
unmap_mft_record(base_ni);
/* Successfully filled the hole. */
status.runlist_merged = 0;
status.mft_attr_mapped = 0;
status.mp_rebuilt = 0;
/* Setup the map cache and use that to deal with the buffer. */
was_hole = TRUE;
vcn = bh_cpos;
vcn_len = 1;
lcn_block = lcn << (vol->cluster_size_bits - blocksize_bits);
cdelta = 0;
/*
* If the number of remaining clusters in the @pages is smaller
* or equal to the number of cached clusters, unlock the
* runlist as the map cache will be used from now on.
*/
if (likely(vcn + vcn_len >= cend)) {
up_write(&ni->runlist.lock);
rl_write_locked = FALSE;
rl = NULL;
}
goto map_buffer_cached;
} while (bh_pos += blocksize, (bh = bh->b_this_page) != head);
/* If there are no errors, do the next page. */
if (likely(!err && ++u < nr_pages))
goto do_next_page;
/* If there are no errors, release the runlist lock if we took it. */
if (likely(!err)) {
if (unlikely(rl_write_locked)) {
up_write(&ni->runlist.lock);
rl_write_locked = FALSE;
} else if (unlikely(rl))
up_read(&ni->runlist.lock);
rl = NULL;
}
/* If we issued read requests, let them complete. */
read_lock_irqsave(&ni->size_lock, flags);
initialized_size = ni->initialized_size;
read_unlock_irqrestore(&ni->size_lock, flags);
while (wait_bh > wait) {
bh = *--wait_bh;
wait_on_buffer(bh);
if (likely(buffer_uptodate(bh))) {
page = bh->b_page;
bh_pos = ((s64)page->index << PAGE_CACHE_SHIFT) +
bh_offset(bh);
/*
* If the buffer overflows the initialized size, need
* to zero the overflowing region.
*/
if (unlikely(bh_pos + blocksize > initialized_size)) {
u8 *kaddr;
int ofs = 0;
if (likely(bh_pos < initialized_size))
ofs = initialized_size - bh_pos;
kaddr = kmap_atomic(page, KM_USER0);
memset(kaddr + bh_offset(bh) + ofs, 0,
blocksize - ofs);
kunmap_atomic(kaddr, KM_USER0);
flush_dcache_page(page);
}
} else /* if (unlikely(!buffer_uptodate(bh))) */
err = -EIO;
}
if (likely(!err)) {
/* Clear buffer_new on all buffers. */
u = 0;
do {
bh = head = page_buffers(pages[u]);
do {
if (buffer_new(bh))
clear_buffer_new(bh);
} while ((bh = bh->b_this_page) != head);
} while (++u < nr_pages);
ntfs_debug("Done.");
return err;
}
if (status.attr_switched) {
/* Get back to the attribute extent we modified. */
ntfs_attr_reinit_search_ctx(ctx);
if (ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
CASE_SENSITIVE, bh_cpos, NULL, 0, ctx)) {
ntfs_error(vol->sb, "Failed to find required "
"attribute extent of attribute in "
"error code path. Run chkdsk to "
"recover.");
write_lock_irqsave(&ni->size_lock, flags);
ni->itype.compressed.size += vol->cluster_size;
write_unlock_irqrestore(&ni->size_lock, flags);
flush_dcache_mft_record_page(ctx->ntfs_ino);
mark_mft_record_dirty(ctx->ntfs_ino);
/*
* The only thing that is now wrong is the compressed
* size of the base attribute extent which chkdsk
* should be able to fix.
*/
NVolSetErrors(vol);
} else {
m = ctx->mrec;
a = ctx->attr;
status.attr_switched = 0;
}
}
/*
* If the runlist has been modified, need to restore it by punching a
* hole into it and we then need to deallocate the on-disk cluster as
* well. Note, we only modify the runlist if we are able to generate a
* new mapping pairs array, i.e. only when the mapped attribute extent
* is not switched.
*/
if (status.runlist_merged && !status.attr_switched) {
BUG_ON(!rl_write_locked);
/* Make the file cluster we allocated sparse in the runlist. */
if (ntfs_rl_punch_nolock(vol, &ni->runlist, bh_cpos, 1)) {
ntfs_error(vol->sb, "Failed to punch hole into "
"attribute runlist in error code "
"path. Run chkdsk to recover the "
"lost cluster.");
NVolSetErrors(vol);
} else /* if (success) */ {
status.runlist_merged = 0;
/*
* Deallocate the on-disk cluster we allocated but only
* if we succeeded in punching its vcn out of the
* runlist.
*/
down_write(&vol->lcnbmp_lock);
if (ntfs_bitmap_clear_bit(vol->lcnbmp_ino, lcn)) {
ntfs_error(vol->sb, "Failed to release "
"allocated cluster in error "
"code path. Run chkdsk to "
"recover the lost cluster.");
NVolSetErrors(vol);
}
up_write(&vol->lcnbmp_lock);
}
}
/*
* Resize the attribute record to its old size and rebuild the mapping
* pairs array. Note, we only can do this if the runlist has been
* restored to its old state which also implies that the mapped
* attribute extent is not switched.
*/
if (status.mp_rebuilt && !status.runlist_merged) {
if (ntfs_attr_record_resize(m, a, attr_rec_len)) {
ntfs_error(vol->sb, "Failed to restore attribute "
"record in error code path. Run "
"chkdsk to recover.");
NVolSetErrors(vol);
} else /* if (success) */ {
if (ntfs_mapping_pairs_build(vol, (u8*)a +
le16_to_cpu(a->data.non_resident.
mapping_pairs_offset), attr_rec_len -
le16_to_cpu(a->data.non_resident.
mapping_pairs_offset), ni->runlist.rl,
vcn, highest_vcn, NULL)) {
ntfs_error(vol->sb, "Failed to restore "
"mapping pairs array in error "
"code path. Run chkdsk to "
"recover.");
NVolSetErrors(vol);
}
flush_dcache_mft_record_page(ctx->ntfs_ino);
mark_mft_record_dirty(ctx->ntfs_ino);
}
}
/* Release the mft record and the attribute. */
if (status.mft_attr_mapped) {
ntfs_attr_put_search_ctx(ctx);
unmap_mft_record(base_ni);
}
/* Release the runlist lock. */
if (rl_write_locked)
up_write(&ni->runlist.lock);
else if (rl)
up_read(&ni->runlist.lock);
/*
* Zero out any newly allocated blocks to avoid exposing stale data.
* If BH_New is set, we know that the block was newly allocated above
* and that it has not been fully zeroed and marked dirty yet.
*/
nr_pages = u;
u = 0;
end = bh_cpos << vol->cluster_size_bits;
do {
page = pages[u];
bh = head = page_buffers(page);
do {
if (u == nr_pages &&
((s64)page->index << PAGE_CACHE_SHIFT) +
bh_offset(bh) >= end)
break;
if (!buffer_new(bh))
continue;
clear_buffer_new(bh);
if (!buffer_uptodate(bh)) {
if (PageUptodate(page))
set_buffer_uptodate(bh);
else {
u8 *kaddr = kmap_atomic(page, KM_USER0);
memset(kaddr + bh_offset(bh), 0,
blocksize);
kunmap_atomic(kaddr, KM_USER0);
flush_dcache_page(page);
set_buffer_uptodate(bh);
}
}
mark_buffer_dirty(bh);
} while ((bh = bh->b_this_page) != head);
} while (++u <= nr_pages);
ntfs_error(vol->sb, "Failed. Returning error code %i.", err);
return err;
}
/*
* Copy as much as we can into the pages and return the number of bytes which
* were sucessfully copied. If a fault is encountered then clear the pages
* out to (ofs + bytes) and return the number of bytes which were copied.
*/
static inline size_t ntfs_copy_from_user(struct page **pages,
unsigned nr_pages, unsigned ofs, const char __user *buf,
size_t bytes)
{
struct page **last_page = pages + nr_pages;
char *kaddr;
size_t total = 0;
unsigned len;
int left;
do {
len = PAGE_CACHE_SIZE - ofs;
if (len > bytes)
len = bytes;
kaddr = kmap_atomic(*pages, KM_USER0);
left = __copy_from_user_inatomic(kaddr + ofs, buf, len);
kunmap_atomic(kaddr, KM_USER0);
if (unlikely(left)) {
/* Do it the slow way. */
kaddr = kmap(*pages);
left = __copy_from_user(kaddr + ofs, buf, len);
kunmap(*pages);
if (unlikely(left))
goto err_out;
}
total += len;
bytes -= len;
if (!bytes)
break;
buf += len;
ofs = 0;
} while (++pages < last_page);
out:
return total;
err_out:
total += len - left;
/* Zero the rest of the target like __copy_from_user(). */
while (++pages < last_page) {
bytes -= len;
if (!bytes)
break;
len = PAGE_CACHE_SIZE;
if (len > bytes)
len = bytes;
kaddr = kmap_atomic(*pages, KM_USER0);
memset(kaddr, 0, len);
kunmap_atomic(kaddr, KM_USER0);
}
goto out;
}
static size_t __ntfs_copy_from_user_iovec_inatomic(char *vaddr,
const struct iovec *iov, size_t iov_ofs, size_t bytes)
{
size_t total = 0;
while (1) {
const char __user *buf = iov->iov_base + iov_ofs;
unsigned len;
size_t left;
len = iov->iov_len - iov_ofs;
if (len > bytes)
len = bytes;
left = __copy_from_user_inatomic(vaddr, buf, len);
total += len;
bytes -= len;
vaddr += len;
if (unlikely(left)) {
total -= left;
break;
}
if (!bytes)
break;
iov++;
iov_ofs = 0;
}
return total;
}
static inline void ntfs_set_next_iovec(const struct iovec **iovp,
size_t *iov_ofsp, size_t bytes)
{
const struct iovec *iov = *iovp;
size_t iov_ofs = *iov_ofsp;
while (bytes) {
unsigned len;
len = iov->iov_len - iov_ofs;
if (len > bytes)
len = bytes;
bytes -= len;
iov_ofs += len;
if (iov->iov_len == iov_ofs) {
iov++;
iov_ofs = 0;
}
}
*iovp = iov;
*iov_ofsp = iov_ofs;
}
/*
* This has the same side-effects and return value as ntfs_copy_from_user().
* The difference is that on a fault we need to memset the remainder of the
* pages (out to offset + bytes), to emulate ntfs_copy_from_user()'s
* single-segment behaviour.
*
* We call the same helper (__ntfs_copy_from_user_iovec_inatomic()) both
* when atomic and when not atomic. This is ok because
* __ntfs_copy_from_user_iovec_inatomic() calls __copy_from_user_inatomic()
* and it is ok to call this when non-atomic.
* Infact, the only difference between __copy_from_user_inatomic() and
* __copy_from_user() is that the latter calls might_sleep() and the former
* should not zero the tail of the buffer on error. And on many
* architectures __copy_from_user_inatomic() is just defined to
* __copy_from_user() so it makes no difference at all on those architectures.
*/
static inline size_t ntfs_copy_from_user_iovec(struct page **pages,
unsigned nr_pages, unsigned ofs, const struct iovec **iov,
size_t *iov_ofs, size_t bytes)
{
struct page **last_page = pages + nr_pages;
char *kaddr;
size_t copied, len, total = 0;
do {
len = PAGE_CACHE_SIZE - ofs;
if (len > bytes)
len = bytes;
kaddr = kmap_atomic(*pages, KM_USER0);
copied = __ntfs_copy_from_user_iovec_inatomic(kaddr + ofs,
*iov, *iov_ofs, len);
kunmap_atomic(kaddr, KM_USER0);
if (unlikely(copied != len)) {
/* Do it the slow way. */
kaddr = kmap(*pages);
copied = __ntfs_copy_from_user_iovec_inatomic(kaddr + ofs,
*iov, *iov_ofs, len);
/*
* Zero the rest of the target like __copy_from_user().
*/
memset(kaddr + ofs + copied, 0, len - copied);
kunmap(*pages);
if (unlikely(copied != len))
goto err_out;
}
total += len;
bytes -= len;
if (!bytes)
break;
ntfs_set_next_iovec(iov, iov_ofs, len);
ofs = 0;
} while (++pages < last_page);
out:
return total;
err_out:
total += copied;
/* Zero the rest of the target like __copy_from_user(). */
while (++pages < last_page) {
bytes -= len;
if (!bytes)
break;
len = PAGE_CACHE_SIZE;
if (len > bytes)
len = bytes;
kaddr = kmap_atomic(*pages, KM_USER0);
memset(kaddr, 0, len);
kunmap_atomic(kaddr, KM_USER0);
}
goto out;
}
static inline void ntfs_flush_dcache_pages(struct page **pages,
unsigned nr_pages)
{
BUG_ON(!nr_pages);
/*
* Warning: Do not do the decrement at the same time as the call to
* flush_dcache_page() because it is a NULL macro on i386 and hence the
* decrement never happens so the loop never terminates.
*/
do {
--nr_pages;
flush_dcache_page(pages[nr_pages]);
} while (nr_pages > 0);
}
/**
* ntfs_commit_pages_after_non_resident_write - commit the received data
* @pages: array of destination pages
* @nr_pages: number of pages in @pages
* @pos: byte position in file at which the write begins
* @bytes: number of bytes to be written
*
* See description of ntfs_commit_pages_after_write(), below.
*/
static inline int ntfs_commit_pages_after_non_resident_write(
struct page **pages, const unsigned nr_pages,
s64 pos, size_t bytes)
{
s64 end, initialized_size;
struct inode *vi;
ntfs_inode *ni, *base_ni;
struct buffer_head *bh, *head;
ntfs_attr_search_ctx *ctx;
MFT_RECORD *m;
ATTR_RECORD *a;
unsigned long flags;
unsigned blocksize, u;
int err;
vi = pages[0]->mapping->host;
ni = NTFS_I(vi);
blocksize = vi->i_sb->s_blocksize;
end = pos + bytes;
u = 0;
do {
s64 bh_pos;
struct page *page;
BOOL partial;
page = pages[u];
bh_pos = (s64)page->index << PAGE_CACHE_SHIFT;
bh = head = page_buffers(page);
partial = FALSE;
do {
s64 bh_end;
bh_end = bh_pos + blocksize;
if (bh_end <= pos || bh_pos >= end) {
if (!buffer_uptodate(bh))
partial = TRUE;
} else {
set_buffer_uptodate(bh);
mark_buffer_dirty(bh);
}
} while (bh_pos += blocksize, (bh = bh->b_this_page) != head);
/*
* If all buffers are now uptodate but the page is not, set the
* page uptodate.
*/
if (!partial && !PageUptodate(page))
SetPageUptodate(page);
} while (++u < nr_pages);
/*
* Finally, if we do not need to update initialized_size or i_size we
* are finished.
*/
read_lock_irqsave(&ni->size_lock, flags);
initialized_size = ni->initialized_size;
read_unlock_irqrestore(&ni->size_lock, flags);
if (end <= initialized_size) {
ntfs_debug("Done.");
return 0;
}
/*
* Update initialized_size/i_size as appropriate, both in the inode and
* the mft record.
*/
if (!NInoAttr(ni))
base_ni = ni;
else
base_ni = ni->ext.base_ntfs_ino;
/* Map, pin, and lock the mft record. */
m = map_mft_record(base_ni);
if (IS_ERR(m)) {
err = PTR_ERR(m);
m = NULL;
ctx = NULL;
goto err_out;
}
BUG_ON(!NInoNonResident(ni));
ctx = ntfs_attr_get_search_ctx(base_ni, m);
if (unlikely(!ctx)) {
err = -ENOMEM;
goto err_out;
}
err = ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
CASE_SENSITIVE, 0, NULL, 0, ctx);
if (unlikely(err)) {
if (err == -ENOENT)
err = -EIO;
goto err_out;
}
a = ctx->attr;
BUG_ON(!a->non_resident);
write_lock_irqsave(&ni->size_lock, flags);
BUG_ON(end > ni->allocated_size);
ni->initialized_size = end;
a->data.non_resident.initialized_size = cpu_to_sle64(end);
if (end > i_size_read(vi)) {
i_size_write(vi, end);
a->data.non_resident.data_size =
a->data.non_resident.initialized_size;
}
write_unlock_irqrestore(&ni->size_lock, flags);
/* Mark the mft record dirty, so it gets written back. */
flush_dcache_mft_record_page(ctx->ntfs_ino);
mark_mft_record_dirty(ctx->ntfs_ino);
ntfs_attr_put_search_ctx(ctx);
unmap_mft_record(base_ni);
ntfs_debug("Done.");
return 0;
err_out:
if (ctx)
ntfs_attr_put_search_ctx(ctx);
if (m)
unmap_mft_record(base_ni);
ntfs_error(vi->i_sb, "Failed to update initialized_size/i_size (error "
"code %i).", err);
if (err != -ENOMEM)
NVolSetErrors(ni->vol);
return err;
}
/**
* ntfs_commit_pages_after_write - commit the received data
* @pages: array of destination pages
* @nr_pages: number of pages in @pages
* @pos: byte position in file at which the write begins
* @bytes: number of bytes to be written
*
* This is called from ntfs_file_buffered_write() with i_mutex held on the inode
* (@pages[0]->mapping->host). There are @nr_pages pages in @pages which are
* locked but not kmap()ped. The source data has already been copied into the
* @page. ntfs_prepare_pages_for_non_resident_write() has been called before
* the data was copied (for non-resident attributes only) and it returned
* success.
*
* Need to set uptodate and mark dirty all buffers within the boundary of the
* write. If all buffers in a page are uptodate we set the page uptodate, too.
*
* Setting the buffers dirty ensures that they get written out later when
* ntfs_writepage() is invoked by the VM.
*
* Finally, we need to update i_size and initialized_size as appropriate both
* in the inode and the mft record.
*
* This is modelled after fs/buffer.c::generic_commit_write(), which marks
* buffers uptodate and dirty, sets the page uptodate if all buffers in the
* page are uptodate, and updates i_size if the end of io is beyond i_size. In
* that case, it also marks the inode dirty.
*
* If things have gone as outlined in
* ntfs_prepare_pages_for_non_resident_write(), we do not need to do any page
* content modifications here for non-resident attributes. For resident
* attributes we need to do the uptodate bringing here which we combine with
* the copying into the mft record which means we save one atomic kmap.
*
* Return 0 on success or -errno on error.
*/
static int ntfs_commit_pages_after_write(struct page **pages,
const unsigned nr_pages, s64 pos, size_t bytes)
{
s64 end, initialized_size;
loff_t i_size;
struct inode *vi;
ntfs_inode *ni, *base_ni;
struct page *page;
ntfs_attr_search_ctx *ctx;
MFT_RECORD *m;
ATTR_RECORD *a;
char *kattr, *kaddr;
unsigned long flags;
u32 attr_len;
int err;
BUG_ON(!nr_pages);
BUG_ON(!pages);
page = pages[0];
BUG_ON(!page);
vi = page->mapping->host;
ni = NTFS_I(vi);
ntfs_debug("Entering for inode 0x%lx, attribute type 0x%x, start page "
"index 0x%lx, nr_pages 0x%x, pos 0x%llx, bytes 0x%zx.",
vi->i_ino, ni->type, page->index, nr_pages,
(long long)pos, bytes);
if (NInoNonResident(ni))
return ntfs_commit_pages_after_non_resident_write(pages,
nr_pages, pos, bytes);
BUG_ON(nr_pages > 1);
/*
* Attribute is resident, implying it is not compressed, encrypted, or
* sparse.
*/
if (!NInoAttr(ni))
base_ni = ni;
else
base_ni = ni->ext.base_ntfs_ino;
BUG_ON(NInoNonResident(ni));
/* Map, pin, and lock the mft record. */
m = map_mft_record(base_ni);
if (IS_ERR(m)) {
err = PTR_ERR(m);
m = NULL;
ctx = NULL;
goto err_out;
}
ctx = ntfs_attr_get_search_ctx(base_ni, m);
if (unlikely(!ctx)) {
err = -ENOMEM;
goto err_out;
}
err = ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
CASE_SENSITIVE, 0, NULL, 0, ctx);
if (unlikely(err)) {
if (err == -ENOENT)
err = -EIO;
goto err_out;
}
a = ctx->attr;
BUG_ON(a->non_resident);
/* The total length of the attribute value. */
attr_len = le32_to_cpu(a->data.resident.value_length);
i_size = i_size_read(vi);
BUG_ON(attr_len != i_size);
BUG_ON(pos > attr_len);
end = pos + bytes;
BUG_ON(end > le32_to_cpu(a->length) -
le16_to_cpu(a->data.resident.value_offset));
kattr = (u8*)a + le16_to_cpu(a->data.resident.value_offset);
kaddr = kmap_atomic(page, KM_USER0);
/* Copy the received data from the page to the mft record. */
memcpy(kattr + pos, kaddr + pos, bytes);
/* Update the attribute length if necessary. */
if (end > attr_len) {
attr_len = end;
a->data.resident.value_length = cpu_to_le32(attr_len);
}
/*
* If the page is not uptodate, bring the out of bounds area(s)
* uptodate by copying data from the mft record to the page.
*/
if (!PageUptodate(page)) {
if (pos > 0)
memcpy(kaddr, kattr, pos);
if (end < attr_len)
memcpy(kaddr + end, kattr + end, attr_len - end);
/* Zero the region outside the end of the attribute value. */
memset(kaddr + attr_len, 0, PAGE_CACHE_SIZE - attr_len);
flush_dcache_page(page);
SetPageUptodate(page);
}
kunmap_atomic(kaddr, KM_USER0);
/* Update initialized_size/i_size if necessary. */
read_lock_irqsave(&ni->size_lock, flags);
initialized_size = ni->initialized_size;
BUG_ON(end > ni->allocated_size);
read_unlock_irqrestore(&ni->size_lock, flags);
BUG_ON(initialized_size != i_size);
if (end > initialized_size) {
unsigned long flags;
write_lock_irqsave(&ni->size_lock, flags);
ni->initialized_size = end;
i_size_write(vi, end);
write_unlock_irqrestore(&ni->size_lock, flags);
}
/* Mark the mft record dirty, so it gets written back. */
flush_dcache_mft_record_page(ctx->ntfs_ino);
mark_mft_record_dirty(ctx->ntfs_ino);
ntfs_attr_put_search_ctx(ctx);
unmap_mft_record(base_ni);
ntfs_debug("Done.");
return 0;
err_out:
if (err == -ENOMEM) {
ntfs_warning(vi->i_sb, "Error allocating memory required to "
"commit the write.");
if (PageUptodate(page)) {
ntfs_warning(vi->i_sb, "Page is uptodate, setting "
"dirty so the write will be retried "
"later on by the VM.");
/*
* Put the page on mapping->dirty_pages, but leave its
* buffers' dirty state as-is.
*/
__set_page_dirty_nobuffers(page);
err = 0;
} else
ntfs_error(vi->i_sb, "Page is not uptodate. Written "
"data has been lost.");
} else {
ntfs_error(vi->i_sb, "Resident attribute commit write failed "
"with error %i.", err);
NVolSetErrors(ni->vol);
}
if (ctx)
ntfs_attr_put_search_ctx(ctx);
if (m)
unmap_mft_record(base_ni);
return err;
}
/**
* ntfs_file_buffered_write -
*
* Locking: The vfs is holding ->i_mutex on the inode.
*/
static ssize_t ntfs_file_buffered_write(struct kiocb *iocb,
const struct iovec *iov, unsigned long nr_segs,
loff_t pos, loff_t *ppos, size_t count)
{
struct file *file = iocb->ki_filp;
struct address_space *mapping = file->f_mapping;
struct inode *vi = mapping->host;
ntfs_inode *ni = NTFS_I(vi);
ntfs_volume *vol = ni->vol;
struct page *pages[NTFS_MAX_PAGES_PER_CLUSTER];
struct page *cached_page = NULL;
char __user *buf = NULL;
s64 end, ll;
VCN last_vcn;
LCN lcn;
unsigned long flags;
size_t bytes, iov_ofs = 0; /* Offset in the current iovec. */
ssize_t status, written;
unsigned nr_pages;
int err;
struct pagevec lru_pvec;
ntfs_debug("Entering for i_ino 0x%lx, attribute type 0x%x, "
"pos 0x%llx, count 0x%lx.",
vi->i_ino, (unsigned)le32_to_cpu(ni->type),
(unsigned long long)pos, (unsigned long)count);
if (unlikely(!count))
return 0;
BUG_ON(NInoMstProtected(ni));
/*
* If the attribute is not an index root and it is encrypted or
* compressed, we cannot write to it yet. Note we need to check for
* AT_INDEX_ALLOCATION since this is the type of both directory and
* index inodes.
*/
if (ni->type != AT_INDEX_ALLOCATION) {
/* If file is encrypted, deny access, just like NT4. */
if (NInoEncrypted(ni)) {
/*
* Reminder for later: Encrypted files are _always_
* non-resident so that the content can always be
* encrypted.
*/
ntfs_debug("Denying write access to encrypted file.");
return -EACCES;
}
if (NInoCompressed(ni)) {
/* Only unnamed $DATA attribute can be compressed. */
BUG_ON(ni->type != AT_DATA);
BUG_ON(ni->name_len);
/*
* Reminder for later: If resident, the data is not
* actually compressed. Only on the switch to non-
* resident does compression kick in. This is in
* contrast to encrypted files (see above).
*/
ntfs_error(vi->i_sb, "Writing to compressed files is "
"not implemented yet. Sorry.");
return -EOPNOTSUPP;
}
}
/*
* If a previous ntfs_truncate() failed, repeat it and abort if it
* fails again.
*/
if (unlikely(NInoTruncateFailed(ni))) {
down_write(&vi->i_alloc_sem);
err = ntfs_truncate(vi);
up_write(&vi->i_alloc_sem);
if (err || NInoTruncateFailed(ni)) {
if (!err)
err = -EIO;
ntfs_error(vol->sb, "Cannot perform write to inode "
"0x%lx, attribute type 0x%x, because "
"ntfs_truncate() failed (error code "
"%i).", vi->i_ino,
(unsigned)le32_to_cpu(ni->type), err);
return err;
}
}
/* The first byte after the write. */
end = pos + count;
/*
* If the write goes beyond the allocated size, extend the allocation
* to cover the whole of the write, rounded up to the nearest cluster.
*/
read_lock_irqsave(&ni->size_lock, flags);
ll = ni->allocated_size;
read_unlock_irqrestore(&ni->size_lock, flags);
if (end > ll) {
/* Extend the allocation without changing the data size. */
ll = ntfs_attr_extend_allocation(ni, end, -1, pos);
if (likely(ll >= 0)) {
BUG_ON(pos >= ll);
/* If the extension was partial truncate the write. */
if (end > ll) {
ntfs_debug("Truncating write to inode 0x%lx, "
"attribute type 0x%x, because "
"the allocation was only "
"partially extended.",
vi->i_ino, (unsigned)
le32_to_cpu(ni->type));
end = ll;
count = ll - pos;
}
} else {
err = ll;
read_lock_irqsave(&ni->size_lock, flags);
ll = ni->allocated_size;
read_unlock_irqrestore(&ni->size_lock, flags);
/* Perform a partial write if possible or fail. */
if (pos < ll) {
ntfs_debug("Truncating write to inode 0x%lx, "
"attribute type 0x%x, because "
"extending the allocation "
"failed (error code %i).",
vi->i_ino, (unsigned)
le32_to_cpu(ni->type), err);
end = ll;
count = ll - pos;
} else {
ntfs_error(vol->sb, "Cannot perform write to "
"inode 0x%lx, attribute type "
"0x%x, because extending the "
"allocation failed (error "
"code %i).", vi->i_ino,
(unsigned)
le32_to_cpu(ni->type), err);
return err;
}
}
}
pagevec_init(&lru_pvec, 0);
written = 0;
/*
* If the write starts beyond the initialized size, extend it up to the
* beginning of the write and initialize all non-sparse space between
* the old initialized size and the new one. This automatically also
* increments the vfs inode->i_size to keep it above or equal to the
* initialized_size.
*/
read_lock_irqsave(&ni->size_lock, flags);
ll = ni->initialized_size;
read_unlock_irqrestore(&ni->size_lock, flags);
if (pos > ll) {
err = ntfs_attr_extend_initialized(ni, pos, &cached_page,
&lru_pvec);
if (err < 0) {
ntfs_error(vol->sb, "Cannot perform write to inode "
"0x%lx, attribute type 0x%x, because "
"extending the initialized size "
"failed (error code %i).", vi->i_ino,
(unsigned)le32_to_cpu(ni->type), err);
status = err;
goto err_out;
}
}
/*
* Determine the number of pages per cluster for non-resident
* attributes.
*/
nr_pages = 1;
if (vol->cluster_size > PAGE_CACHE_SIZE && NInoNonResident(ni))
nr_pages = vol->cluster_size >> PAGE_CACHE_SHIFT;
/* Finally, perform the actual write. */
last_vcn = -1;
if (likely(nr_segs == 1))
buf = iov->iov_base;
do {
VCN vcn;
pgoff_t idx, start_idx;
unsigned ofs, do_pages, u;
size_t copied;
start_idx = idx = pos >> PAGE_CACHE_SHIFT;
ofs = pos & ~PAGE_CACHE_MASK;
bytes = PAGE_CACHE_SIZE - ofs;
do_pages = 1;
if (nr_pages > 1) {
vcn = pos >> vol->cluster_size_bits;
if (vcn != last_vcn) {
last_vcn = vcn;
/*
* Get the lcn of the vcn the write is in. If
* it is a hole, need to lock down all pages in
* the cluster.
*/
down_read(&ni->runlist.lock);
lcn = ntfs_attr_vcn_to_lcn_nolock(ni, pos >>
vol->cluster_size_bits, FALSE);
up_read(&ni->runlist.lock);
if (unlikely(lcn < LCN_HOLE)) {
status = -EIO;
if (lcn == LCN_ENOMEM)
status = -ENOMEM;
else
ntfs_error(vol->sb, "Cannot "
"perform write to "
"inode 0x%lx, "
"attribute type 0x%x, "
"because the attribute "
"is corrupt.",
vi->i_ino, (unsigned)
le32_to_cpu(ni->type));
break;
}
if (lcn == LCN_HOLE) {
start_idx = (pos & ~(s64)
vol->cluster_size_mask)
>> PAGE_CACHE_SHIFT;
bytes = vol->cluster_size - (pos &
vol->cluster_size_mask);
do_pages = nr_pages;
}
}
}
if (bytes > count)
bytes = count;
/*
* Bring in the user page(s) that we will copy from _first_.
* Otherwise there is a nasty deadlock on copying from the same
* page(s) as we are writing to, without it/them being marked
* up-to-date. Note, at present there is nothing to stop the
* pages being swapped out between us bringing them into memory
* and doing the actual copying.
*/
if (likely(nr_segs == 1))
ntfs_fault_in_pages_readable(buf, bytes);
else
ntfs_fault_in_pages_readable_iovec(iov, iov_ofs, bytes);
/* Get and lock @do_pages starting at index @start_idx. */
status = __ntfs_grab_cache_pages(mapping, start_idx, do_pages,
pages, &cached_page, &lru_pvec);
if (unlikely(status))
break;
/*
* For non-resident attributes, we need to fill any holes with
* actual clusters and ensure all bufferes are mapped. We also
* need to bring uptodate any buffers that are only partially
* being written to.
*/
if (NInoNonResident(ni)) {
status = ntfs_prepare_pages_for_non_resident_write(
pages, do_pages, pos, bytes);
if (unlikely(status)) {
loff_t i_size;
do {
unlock_page(pages[--do_pages]);
page_cache_release(pages[do_pages]);
} while (do_pages);
/*
* The write preparation may have instantiated
* allocated space outside i_size. Trim this
* off again. We can ignore any errors in this
* case as we will just be waisting a bit of
* allocated space, which is not a disaster.
*/
i_size = i_size_read(vi);
if (pos + bytes > i_size)
vmtruncate(vi, i_size);
break;
}
}
u = (pos >> PAGE_CACHE_SHIFT) - pages[0]->index;
if (likely(nr_segs == 1)) {
copied = ntfs_copy_from_user(pages + u, do_pages - u,
ofs, buf, bytes);
buf += copied;
} else
copied = ntfs_copy_from_user_iovec(pages + u,
do_pages - u, ofs, &iov, &iov_ofs,
bytes);
ntfs_flush_dcache_pages(pages + u, do_pages - u);
status = ntfs_commit_pages_after_write(pages, do_pages, pos,
bytes);
if (likely(!status)) {
written += copied;
count -= copied;
pos += copied;
if (unlikely(copied != bytes))
status = -EFAULT;
}
do {
unlock_page(pages[--do_pages]);
mark_page_accessed(pages[do_pages]);
page_cache_release(pages[do_pages]);
} while (do_pages);
if (unlikely(status))
break;
balance_dirty_pages_ratelimited(mapping);
cond_resched();
} while (count);
err_out:
*ppos = pos;
if (cached_page)
page_cache_release(cached_page);
/* For now, when the user asks for O_SYNC, we actually give O_DSYNC. */
if (likely(!status)) {
if (unlikely((file->f_flags & O_SYNC) || IS_SYNC(vi))) {
if (!mapping->a_ops->writepage || !is_sync_kiocb(iocb))
status = generic_osync_inode(vi, mapping,
OSYNC_METADATA|OSYNC_DATA);
}
}
pagevec_lru_add(&lru_pvec);
ntfs_debug("Done. Returning %s (written 0x%lx, status %li).",
written ? "written" : "status", (unsigned long)written,
(long)status);
return written ? written : status;
}
/**
* ntfs_file_aio_write_nolock -
*/
static ssize_t ntfs_file_aio_write_nolock(struct kiocb *iocb,
const struct iovec *iov, unsigned long nr_segs, loff_t *ppos)
{
struct file *file = iocb->ki_filp;
struct address_space *mapping = file->f_mapping;
struct inode *inode = mapping->host;
loff_t pos;
unsigned long seg;
size_t count; /* after file limit checks */
ssize_t written, err;
count = 0;
for (seg = 0; seg < nr_segs; seg++) {
const struct iovec *iv = &iov[seg];
/*
* If any segment has a negative length, or the cumulative
* length ever wraps negative then return -EINVAL.
*/
count += iv->iov_len;
if (unlikely((ssize_t)(count|iv->iov_len) < 0))
return -EINVAL;
if (access_ok(VERIFY_READ, iv->iov_base, iv->iov_len))
continue;
if (!seg)
return -EFAULT;
nr_segs = seg;
count -= iv->iov_len; /* This segment is no good */
break;
}
pos = *ppos;
vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
/* We can write back this queue in page reclaim. */
current->backing_dev_info = mapping->backing_dev_info;
written = 0;
err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
if (err)
goto out;
if (!count)
goto out;
err = remove_suid(file->f_dentry);
if (err)
goto out;
file_update_time(file);
written = ntfs_file_buffered_write(iocb, iov, nr_segs, pos, ppos,
count);
out:
current->backing_dev_info = NULL;
return written ? written : err;
}
/**
* ntfs_file_aio_write -
*/
static ssize_t ntfs_file_aio_write(struct kiocb *iocb, const char __user *buf,
size_t count, loff_t pos)
{
struct file *file = iocb->ki_filp;
struct address_space *mapping = file->f_mapping;
struct inode *inode = mapping->host;
ssize_t ret;
struct iovec local_iov = { .iov_base = (void __user *)buf,
.iov_len = count };
BUG_ON(iocb->ki_pos != pos);
mutex_lock(&inode->i_mutex);
ret = ntfs_file_aio_write_nolock(iocb, &local_iov, 1, &iocb->ki_pos);
mutex_unlock(&inode->i_mutex);
if (ret > 0 && ((file->f_flags & O_SYNC) || IS_SYNC(inode))) {
int err = sync_page_range(inode, mapping, pos, ret);
if (err < 0)
ret = err;
}
return ret;
}
/**
* ntfs_file_writev -
*
* Basically the same as generic_file_writev() except that it ends up calling
* ntfs_file_aio_write_nolock() instead of __generic_file_aio_write_nolock().
*/
static ssize_t ntfs_file_writev(struct file *file, const struct iovec *iov,
unsigned long nr_segs, loff_t *ppos)
{
struct address_space *mapping = file->f_mapping;
struct inode *inode = mapping->host;
struct kiocb kiocb;
ssize_t ret;
mutex_lock(&inode->i_mutex);
init_sync_kiocb(&kiocb, file);
ret = ntfs_file_aio_write_nolock(&kiocb, iov, nr_segs, ppos);
if (ret == -EIOCBQUEUED)
ret = wait_on_sync_kiocb(&kiocb);
mutex_unlock(&inode->i_mutex);
if (ret > 0 && ((file->f_flags & O_SYNC) || IS_SYNC(inode))) {
int err = sync_page_range(inode, mapping, *ppos - ret, ret);
if (err < 0)
ret = err;
}
return ret;
}
/**
* ntfs_file_write - simple wrapper for ntfs_file_writev()
*/
static ssize_t ntfs_file_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
struct iovec local_iov = { .iov_base = (void __user *)buf,
.iov_len = count };
return ntfs_file_writev(file, &local_iov, 1, ppos);
}
/**
* ntfs_file_fsync - sync a file to disk
* @filp: file to be synced
* @dentry: dentry describing the file to sync
* @datasync: if non-zero only flush user data and not metadata
*
* Data integrity sync of a file to disk. Used for fsync, fdatasync, and msync
* system calls. This function is inspired by fs/buffer.c::file_fsync().
*
* If @datasync is false, write the mft record and all associated extent mft
* records as well as the $DATA attribute and then sync the block device.
*
* If @datasync is true and the attribute is non-resident, we skip the writing
* of the mft record and all associated extent mft records (this might still
* happen due to the write_inode_now() call).
*
* Also, if @datasync is true, we do not wait on the inode to be written out
* but we always wait on the page cache pages to be written out.
*
* Note: In the past @filp could be NULL so we ignore it as we don't need it
* anyway.
*
* Locking: Caller must hold i_mutex on the inode.
*
* TODO: We should probably also write all attribute/index inodes associated
* with this inode but since we have no simple way of getting to them we ignore
* this problem for now.
*/
static int ntfs_file_fsync(struct file *filp, struct dentry *dentry,
int datasync)
{
struct inode *vi = dentry->d_inode;
int err, ret = 0;
ntfs_debug("Entering for inode 0x%lx.", vi->i_ino);
BUG_ON(S_ISDIR(vi->i_mode));
if (!datasync || !NInoNonResident(NTFS_I(vi)))
ret = ntfs_write_inode(vi, 1);
write_inode_now(vi, !datasync);
/*
* NOTE: If we were to use mapping->private_list (see ext2 and
* fs/buffer.c) for dirty blocks then we could optimize the below to be
* sync_mapping_buffers(vi->i_mapping).
*/
err = sync_blockdev(vi->i_sb->s_bdev);
if (unlikely(err && !ret))
ret = err;
if (likely(!ret))
ntfs_debug("Done.");
else
ntfs_warning(vi->i_sb, "Failed to f%ssync inode 0x%lx. Error "
"%u.", datasync ? "data" : "", vi->i_ino, -ret);
return ret;
}
#endif /* NTFS_RW */
const struct file_operations ntfs_file_ops = {
.llseek = generic_file_llseek, /* Seek inside file. */
.read = generic_file_read, /* Read from file. */
.aio_read = generic_file_aio_read, /* Async read from file. */
.readv = generic_file_readv, /* Read from file. */
#ifdef NTFS_RW
.write = ntfs_file_write, /* Write to file. */
.aio_write = ntfs_file_aio_write, /* Async write to file. */
.writev = ntfs_file_writev, /* Write to file. */
/*.release = ,*/ /* Last file is closed. See
fs/ext2/file.c::
ext2_release_file() for
how to use this to discard
preallocated space for
write opened files. */
.fsync = ntfs_file_fsync, /* Sync a file to disk. */
/*.aio_fsync = ,*/ /* Sync all outstanding async
i/o operations on a
kiocb. */
#endif /* NTFS_RW */
/*.ioctl = ,*/ /* Perform function on the
mounted filesystem. */
.mmap = generic_file_mmap, /* Mmap file. */
.open = ntfs_file_open, /* Open file. */
.sendfile = generic_file_sendfile, /* Zero-copy data send with
the data source being on
the ntfs partition. We do
not need to care about the
data destination. */
/*.sendpage = ,*/ /* Zero-copy data send with
the data destination being
on the ntfs partition. We
do not need to care about
the data source. */
};
struct inode_operations ntfs_file_inode_ops = {
#ifdef NTFS_RW
.truncate = ntfs_truncate_vfs,
.setattr = ntfs_setattr,
#endif /* NTFS_RW */
};
const struct file_operations ntfs_empty_file_ops = {};
struct inode_operations ntfs_empty_inode_ops = {};
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