![Minchan Kim](/assets/img/avatar_default.png)
cached_page and lru_pvec have not been used. Let's remove the arguments. Signed-off-by: Minchan Kim <minchan.kim@gmail.com> Acked-by: Anton Altaparmakov <aia21@cantab.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2245 lines
67 KiB
C
2245 lines
67 KiB
C
/*
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* file.c - NTFS kernel file operations. Part of the Linux-NTFS project.
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*
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* Copyright (c) 2001-2007 Anton Altaparmakov
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*
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* This program/include file is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as published
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* by the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program/include file is distributed in the hope that it will be
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* useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program (in the main directory of the Linux-NTFS
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* distribution in the file COPYING); if not, write to the Free Software
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* Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/buffer_head.h>
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#include <linux/gfp.h>
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#include <linux/pagemap.h>
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#include <linux/pagevec.h>
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#include <linux/sched.h>
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#include <linux/swap.h>
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#include <linux/uio.h>
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#include <linux/writeback.h>
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#include <asm/page.h>
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#include <asm/uaccess.h>
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#include "attrib.h"
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#include "bitmap.h"
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#include "inode.h"
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#include "debug.h"
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#include "lcnalloc.h"
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#include "malloc.h"
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#include "mft.h"
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#include "ntfs.h"
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/**
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* ntfs_file_open - called when an inode is about to be opened
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* @vi: inode to be opened
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* @filp: file structure describing the inode
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*
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* Limit file size to the page cache limit on architectures where unsigned long
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* is 32-bits. This is the most we can do for now without overflowing the page
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* cache page index. Doing it this way means we don't run into problems because
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* of existing too large files. It would be better to allow the user to read
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* the beginning of the file but I doubt very much anyone is going to hit this
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* check on a 32-bit architecture, so there is no point in adding the extra
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* complexity required to support this.
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*
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* On 64-bit architectures, the check is hopefully optimized away by the
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* compiler.
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*
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* After the check passes, just call generic_file_open() to do its work.
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*/
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static int ntfs_file_open(struct inode *vi, struct file *filp)
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{
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if (sizeof(unsigned long) < 8) {
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if (i_size_read(vi) > MAX_LFS_FILESIZE)
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return -EOVERFLOW;
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}
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return generic_file_open(vi, filp);
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}
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#ifdef NTFS_RW
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/**
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* ntfs_attr_extend_initialized - extend the initialized size of an attribute
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* @ni: ntfs inode of the attribute to extend
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* @new_init_size: requested new initialized size in bytes
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* @cached_page: store any allocated but unused page here
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* @lru_pvec: lru-buffering pagevec of the caller
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*
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* Extend the initialized size of an attribute described by the ntfs inode @ni
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* to @new_init_size bytes. This involves zeroing any non-sparse space between
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* the old initialized size and @new_init_size both in the page cache and on
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* disk (if relevant complete pages are already uptodate in the page cache then
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* these are simply marked dirty).
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*
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* As a side-effect, the file size (vfs inode->i_size) may be incremented as,
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* in the resident attribute case, it is tied to the initialized size and, in
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* the non-resident attribute case, it may not fall below the initialized size.
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*
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* Note that if the attribute is resident, we do not need to touch the page
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* cache at all. This is because if the page cache page is not uptodate we
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* bring it uptodate later, when doing the write to the mft record since we
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* then already have the page mapped. And if the page is uptodate, the
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* non-initialized region will already have been zeroed when the page was
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* brought uptodate and the region may in fact already have been overwritten
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* with new data via mmap() based writes, so we cannot just zero it. And since
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* POSIX specifies that the behaviour of resizing a file whilst it is mmap()ped
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* is unspecified, we choose not to do zeroing and thus we do not need to touch
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* the page at all. For a more detailed explanation see ntfs_truncate() in
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* fs/ntfs/inode.c.
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*
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* Return 0 on success and -errno on error. In the case that an error is
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* encountered it is possible that the initialized size will already have been
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* incremented some way towards @new_init_size but it is guaranteed that if
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* this is the case, the necessary zeroing will also have happened and that all
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* metadata is self-consistent.
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*
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* Locking: i_mutex on the vfs inode corrseponsind to the ntfs inode @ni must be
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* held by the caller.
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*/
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static int ntfs_attr_extend_initialized(ntfs_inode *ni, const s64 new_init_size)
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{
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s64 old_init_size;
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loff_t old_i_size;
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pgoff_t index, end_index;
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unsigned long flags;
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struct inode *vi = VFS_I(ni);
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ntfs_inode *base_ni;
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MFT_RECORD *m = NULL;
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ATTR_RECORD *a;
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ntfs_attr_search_ctx *ctx = NULL;
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struct address_space *mapping;
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struct page *page = NULL;
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u8 *kattr;
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int err;
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u32 attr_len;
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read_lock_irqsave(&ni->size_lock, flags);
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old_init_size = ni->initialized_size;
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old_i_size = i_size_read(vi);
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BUG_ON(new_init_size > ni->allocated_size);
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read_unlock_irqrestore(&ni->size_lock, flags);
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ntfs_debug("Entering for i_ino 0x%lx, attribute type 0x%x, "
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"old_initialized_size 0x%llx, "
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"new_initialized_size 0x%llx, i_size 0x%llx.",
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vi->i_ino, (unsigned)le32_to_cpu(ni->type),
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(unsigned long long)old_init_size,
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(unsigned long long)new_init_size, old_i_size);
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if (!NInoAttr(ni))
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base_ni = ni;
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else
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base_ni = ni->ext.base_ntfs_ino;
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/* Use goto to reduce indentation and we need the label below anyway. */
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if (NInoNonResident(ni))
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goto do_non_resident_extend;
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BUG_ON(old_init_size != old_i_size);
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m = map_mft_record(base_ni);
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if (IS_ERR(m)) {
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err = PTR_ERR(m);
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m = NULL;
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goto err_out;
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}
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ctx = ntfs_attr_get_search_ctx(base_ni, m);
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if (unlikely(!ctx)) {
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err = -ENOMEM;
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goto err_out;
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}
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err = ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
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CASE_SENSITIVE, 0, NULL, 0, ctx);
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if (unlikely(err)) {
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if (err == -ENOENT)
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err = -EIO;
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goto err_out;
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}
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m = ctx->mrec;
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a = ctx->attr;
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BUG_ON(a->non_resident);
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/* The total length of the attribute value. */
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attr_len = le32_to_cpu(a->data.resident.value_length);
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BUG_ON(old_i_size != (loff_t)attr_len);
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/*
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* Do the zeroing in the mft record and update the attribute size in
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* the mft record.
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*/
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kattr = (u8*)a + le16_to_cpu(a->data.resident.value_offset);
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memset(kattr + attr_len, 0, new_init_size - attr_len);
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a->data.resident.value_length = cpu_to_le32((u32)new_init_size);
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/* Finally, update the sizes in the vfs and ntfs inodes. */
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write_lock_irqsave(&ni->size_lock, flags);
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i_size_write(vi, new_init_size);
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ni->initialized_size = new_init_size;
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write_unlock_irqrestore(&ni->size_lock, flags);
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goto done;
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do_non_resident_extend:
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/*
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* If the new initialized size @new_init_size exceeds the current file
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* size (vfs inode->i_size), we need to extend the file size to the
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* new initialized size.
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*/
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if (new_init_size > old_i_size) {
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m = map_mft_record(base_ni);
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if (IS_ERR(m)) {
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err = PTR_ERR(m);
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m = NULL;
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goto err_out;
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}
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ctx = ntfs_attr_get_search_ctx(base_ni, m);
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if (unlikely(!ctx)) {
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err = -ENOMEM;
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goto err_out;
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}
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err = ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
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CASE_SENSITIVE, 0, NULL, 0, ctx);
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if (unlikely(err)) {
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if (err == -ENOENT)
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err = -EIO;
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goto err_out;
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}
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m = ctx->mrec;
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a = ctx->attr;
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BUG_ON(!a->non_resident);
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BUG_ON(old_i_size != (loff_t)
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sle64_to_cpu(a->data.non_resident.data_size));
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a->data.non_resident.data_size = cpu_to_sle64(new_init_size);
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flush_dcache_mft_record_page(ctx->ntfs_ino);
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mark_mft_record_dirty(ctx->ntfs_ino);
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/* Update the file size in the vfs inode. */
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i_size_write(vi, new_init_size);
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ntfs_attr_put_search_ctx(ctx);
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ctx = NULL;
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unmap_mft_record(base_ni);
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m = NULL;
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}
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mapping = vi->i_mapping;
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index = old_init_size >> PAGE_CACHE_SHIFT;
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end_index = (new_init_size + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
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do {
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/*
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* Read the page. If the page is not present, this will zero
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* the uninitialized regions for us.
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*/
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page = read_mapping_page(mapping, index, NULL);
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if (IS_ERR(page)) {
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err = PTR_ERR(page);
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goto init_err_out;
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}
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if (unlikely(PageError(page))) {
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page_cache_release(page);
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err = -EIO;
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goto init_err_out;
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}
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/*
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* Update the initialized size in the ntfs inode. This is
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* enough to make ntfs_writepage() work.
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*/
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write_lock_irqsave(&ni->size_lock, flags);
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ni->initialized_size = (s64)(index + 1) << PAGE_CACHE_SHIFT;
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if (ni->initialized_size > new_init_size)
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ni->initialized_size = new_init_size;
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write_unlock_irqrestore(&ni->size_lock, flags);
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/* Set the page dirty so it gets written out. */
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set_page_dirty(page);
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page_cache_release(page);
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/*
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* Play nice with the vm and the rest of the system. This is
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* very much needed as we can potentially be modifying the
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* initialised size from a very small value to a really huge
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* value, e.g.
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* f = open(somefile, O_TRUNC);
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* truncate(f, 10GiB);
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* seek(f, 10GiB);
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* write(f, 1);
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* And this would mean we would be marking dirty hundreds of
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* thousands of pages or as in the above example more than
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* two and a half million pages!
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*
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* TODO: For sparse pages could optimize this workload by using
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* the FsMisc / MiscFs page bit as a "PageIsSparse" bit. This
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* would be set in readpage for sparse pages and here we would
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* not need to mark dirty any pages which have this bit set.
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* The only caveat is that we have to clear the bit everywhere
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* where we allocate any clusters that lie in the page or that
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* contain the page.
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*
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* TODO: An even greater optimization would be for us to only
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* call readpage() on pages which are not in sparse regions as
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* determined from the runlist. This would greatly reduce the
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* number of pages we read and make dirty in the case of sparse
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* files.
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*/
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balance_dirty_pages_ratelimited(mapping);
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cond_resched();
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} while (++index < end_index);
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read_lock_irqsave(&ni->size_lock, flags);
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BUG_ON(ni->initialized_size != new_init_size);
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read_unlock_irqrestore(&ni->size_lock, flags);
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/* Now bring in sync the initialized_size in the mft record. */
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m = map_mft_record(base_ni);
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if (IS_ERR(m)) {
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err = PTR_ERR(m);
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m = NULL;
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goto init_err_out;
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}
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ctx = ntfs_attr_get_search_ctx(base_ni, m);
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if (unlikely(!ctx)) {
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err = -ENOMEM;
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goto init_err_out;
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}
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err = ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
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CASE_SENSITIVE, 0, NULL, 0, ctx);
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if (unlikely(err)) {
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if (err == -ENOENT)
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err = -EIO;
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goto init_err_out;
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}
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m = ctx->mrec;
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a = ctx->attr;
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BUG_ON(!a->non_resident);
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a->data.non_resident.initialized_size = cpu_to_sle64(new_init_size);
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done:
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flush_dcache_mft_record_page(ctx->ntfs_ino);
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mark_mft_record_dirty(ctx->ntfs_ino);
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if (ctx)
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ntfs_attr_put_search_ctx(ctx);
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if (m)
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unmap_mft_record(base_ni);
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ntfs_debug("Done, initialized_size 0x%llx, i_size 0x%llx.",
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(unsigned long long)new_init_size, i_size_read(vi));
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return 0;
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init_err_out:
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write_lock_irqsave(&ni->size_lock, flags);
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ni->initialized_size = old_init_size;
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write_unlock_irqrestore(&ni->size_lock, flags);
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err_out:
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if (ctx)
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ntfs_attr_put_search_ctx(ctx);
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if (m)
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unmap_mft_record(base_ni);
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ntfs_debug("Failed. Returning error code %i.", err);
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return err;
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}
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|
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/**
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* ntfs_fault_in_pages_readable -
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*
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* Fault a number of userspace pages into pagetables.
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*
|
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* Unlike include/linux/pagemap.h::fault_in_pages_readable(), this one copes
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* with more than two userspace pages as well as handling the single page case
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* elegantly.
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*
|
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* If you find this difficult to understand, then think of the while loop being
|
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* the following code, except that we do without the integer variable ret:
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*
|
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* do {
|
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* ret = __get_user(c, uaddr);
|
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* uaddr += PAGE_SIZE;
|
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* } while (!ret && uaddr < end);
|
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*
|
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* Note, the final __get_user() may well run out-of-bounds of the user buffer,
|
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* but _not_ out-of-bounds of the page the user buffer belongs to, and since
|
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* this is only a read and not a write, and since it is still in the same page,
|
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* it should not matter and this makes the code much simpler.
|
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*/
|
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static inline void ntfs_fault_in_pages_readable(const char __user *uaddr,
|
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int bytes)
|
|
{
|
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const char __user *end;
|
|
volatile char c;
|
|
|
|
/* Set @end to the first byte outside the last page we care about. */
|
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end = (const char __user*)PAGE_ALIGN((unsigned long)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 @mapping 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_file(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 {
|
|
page = pages[u];
|
|
BUG_ON(!page);
|
|
/*
|
|
* 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 {
|
|
zero_user(page, bh_offset(bh),
|
|
blocksize);
|
|
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 {
|
|
zero_user(page, bh_offset(bh),
|
|
blocksize);
|
|
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)) {
|
|
zero_user(page, bh_offset(bh),
|
|
blocksize);
|
|
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)) {
|
|
zero_user(page, bh_offset(bh), blocksize);
|
|
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)) {
|
|
zero_user(page, bh_offset(bh),
|
|
blocksize);
|
|
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)) {
|
|
int ofs = 0;
|
|
|
|
if (likely(bh_pos < initialized_size))
|
|
ofs = initialized_size - bh_pos;
|
|
zero_user_segment(page, bh_offset(bh) + ofs,
|
|
blocksize);
|
|
}
|
|
} 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 {
|
|
zero_user(page, bh_offset(bh),
|
|
blocksize);
|
|
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 successfully 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 *addr;
|
|
size_t total = 0;
|
|
unsigned len;
|
|
int left;
|
|
|
|
do {
|
|
len = PAGE_CACHE_SIZE - ofs;
|
|
if (len > bytes)
|
|
len = bytes;
|
|
addr = kmap_atomic(*pages, KM_USER0);
|
|
left = __copy_from_user_inatomic(addr + ofs, buf, len);
|
|
kunmap_atomic(addr, KM_USER0);
|
|
if (unlikely(left)) {
|
|
/* Do it the slow way. */
|
|
addr = kmap(*pages);
|
|
left = __copy_from_user(addr + 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;
|
|
zero_user(*pages, 0, len);
|
|
}
|
|
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 *addr;
|
|
size_t copied, len, total = 0;
|
|
|
|
do {
|
|
len = PAGE_CACHE_SIZE - ofs;
|
|
if (len > bytes)
|
|
len = bytes;
|
|
addr = kmap_atomic(*pages, KM_USER0);
|
|
copied = __ntfs_copy_from_user_iovec_inatomic(addr + ofs,
|
|
*iov, *iov_ofs, len);
|
|
kunmap_atomic(addr, KM_USER0);
|
|
if (unlikely(copied != len)) {
|
|
/* Do it the slow way. */
|
|
addr = kmap(*pages);
|
|
copied = __ntfs_copy_from_user_iovec_inatomic(addr + ofs,
|
|
*iov, *iov_ofs, len);
|
|
/*
|
|
* Zero the rest of the target like __copy_from_user().
|
|
*/
|
|
memset(addr + 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;
|
|
zero_user(*pages, 0, len);
|
|
}
|
|
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) {
|
|
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);
|
|
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);
|
|
pagevec_lru_add_file(&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;
|
|
size_t count; /* after file limit checks */
|
|
ssize_t written, err;
|
|
|
|
count = 0;
|
|
err = generic_segment_checks(iov, &nr_segs, &count, VERIFY_READ);
|
|
if (err)
|
|
return err;
|
|
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 = file_remove_suid(file);
|
|
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 struct iovec *iov,
|
|
unsigned long nr_segs, loff_t pos)
|
|
{
|
|
struct file *file = iocb->ki_filp;
|
|
struct address_space *mapping = file->f_mapping;
|
|
struct inode *inode = mapping->host;
|
|
ssize_t ret;
|
|
|
|
BUG_ON(iocb->ki_pos != pos);
|
|
|
|
mutex_lock(&inode->i_mutex);
|
|
ret = ntfs_file_aio_write_nolock(iocb, iov, nr_segs, &iocb->ki_pos);
|
|
mutex_unlock(&inode->i_mutex);
|
|
if (ret > 0) {
|
|
int err = generic_write_sync(file, pos, ret);
|
|
if (err < 0)
|
|
ret = err;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* 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 = do_sync_read, /* Read from file. */
|
|
.aio_read = generic_file_aio_read, /* Async read from file. */
|
|
#ifdef NTFS_RW
|
|
.write = do_sync_write, /* Write to file. */
|
|
.aio_write = ntfs_file_aio_write, /* Async 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. */
|
|
.splice_read = generic_file_splice_read /* 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. */
|
|
};
|
|
|
|
const 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 = {};
|
|
|
|
const struct inode_operations ntfs_empty_inode_ops = {};
|