forked from Minki/linux
dax,ext2: replace XIP read and write with DAX I/O
Use the generic AIO infrastructure instead of custom read and write methods. In addition to giving us support for AIO, this adds the missing locking between read() and truncate(). Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com> Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com> Reviewed-by: Jan Kara <jack@suse.cz> Cc: Andreas Dilger <andreas.dilger@intel.com> Cc: Boaz Harrosh <boaz@plexistor.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Dave Chinner <david@fromorbit.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Randy Dunlap <rdunlap@infradead.org> Cc: Theodore Ts'o <tytso@mit.edu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matthew Wilcox
Linus Torvalds
parent
fbbbad4bc2
commit
d475c6346a
@ -3151,6 +3151,12 @@ L: linux-i2c@vger.kernel.org
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S: Maintained
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F: drivers/i2c/busses/i2c-diolan-u2c.c
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DIRECT ACCESS (DAX)
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M: Matthew Wilcox <willy@linux.intel.com>
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L: linux-fsdevel@vger.kernel.org
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S: Supported
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F: fs/dax.c
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DIRECTORY NOTIFICATION (DNOTIFY)
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M: Eric Paris <eparis@parisplace.org>
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S: Maintained
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@ -28,6 +28,7 @@ obj-$(CONFIG_SIGNALFD) += signalfd.o
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obj-$(CONFIG_TIMERFD) += timerfd.o
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obj-$(CONFIG_EVENTFD) += eventfd.o
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obj-$(CONFIG_AIO) += aio.o
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obj-$(CONFIG_FS_XIP) += dax.o
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obj-$(CONFIG_FILE_LOCKING) += locks.o
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obj-$(CONFIG_COMPAT) += compat.o compat_ioctl.o
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obj-$(CONFIG_BINFMT_AOUT) += binfmt_aout.o
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186
fs/dax.c
Normal file
186
fs/dax.c
Normal file
@ -0,0 +1,186 @@
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/*
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* fs/dax.c - Direct Access filesystem code
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* Copyright (c) 2013-2014 Intel Corporation
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* Author: Matthew Wilcox <matthew.r.wilcox@intel.com>
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* Author: Ross Zwisler <ross.zwisler@linux.intel.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#include <linux/atomic.h>
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#include <linux/blkdev.h>
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#include <linux/buffer_head.h>
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#include <linux/fs.h>
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#include <linux/genhd.h>
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#include <linux/mutex.h>
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#include <linux/uio.h>
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static long dax_get_addr(struct buffer_head *bh, void **addr, unsigned blkbits)
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{
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unsigned long pfn;
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sector_t sector = bh->b_blocknr << (blkbits - 9);
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return bdev_direct_access(bh->b_bdev, sector, addr, &pfn, bh->b_size);
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}
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static void dax_new_buf(void *addr, unsigned size, unsigned first, loff_t pos,
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loff_t end)
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{
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loff_t final = end - pos + first; /* The final byte of the buffer */
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if (first > 0)
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memset(addr, 0, first);
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if (final < size)
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memset(addr + final, 0, size - final);
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}
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static bool buffer_written(struct buffer_head *bh)
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{
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return buffer_mapped(bh) && !buffer_unwritten(bh);
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}
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/*
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* When ext4 encounters a hole, it returns without modifying the buffer_head
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* which means that we can't trust b_size. To cope with this, we set b_state
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* to 0 before calling get_block and, if any bit is set, we know we can trust
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* b_size. Unfortunate, really, since ext4 knows precisely how long a hole is
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* and would save us time calling get_block repeatedly.
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*/
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static bool buffer_size_valid(struct buffer_head *bh)
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{
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return bh->b_state != 0;
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}
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static ssize_t dax_io(int rw, struct inode *inode, struct iov_iter *iter,
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loff_t start, loff_t end, get_block_t get_block,
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struct buffer_head *bh)
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{
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ssize_t retval = 0;
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loff_t pos = start;
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loff_t max = start;
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loff_t bh_max = start;
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void *addr;
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bool hole = false;
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if (rw != WRITE)
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end = min(end, i_size_read(inode));
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while (pos < end) {
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unsigned len;
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if (pos == max) {
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unsigned blkbits = inode->i_blkbits;
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sector_t block = pos >> blkbits;
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unsigned first = pos - (block << blkbits);
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long size;
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if (pos == bh_max) {
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bh->b_size = PAGE_ALIGN(end - pos);
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bh->b_state = 0;
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retval = get_block(inode, block, bh,
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rw == WRITE);
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if (retval)
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break;
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if (!buffer_size_valid(bh))
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bh->b_size = 1 << blkbits;
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bh_max = pos - first + bh->b_size;
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} else {
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unsigned done = bh->b_size -
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(bh_max - (pos - first));
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bh->b_blocknr += done >> blkbits;
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bh->b_size -= done;
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}
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hole = (rw != WRITE) && !buffer_written(bh);
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if (hole) {
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addr = NULL;
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size = bh->b_size - first;
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} else {
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retval = dax_get_addr(bh, &addr, blkbits);
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if (retval < 0)
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break;
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if (buffer_unwritten(bh) || buffer_new(bh))
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dax_new_buf(addr, retval, first, pos,
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end);
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addr += first;
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size = retval - first;
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}
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max = min(pos + size, end);
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}
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if (rw == WRITE)
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len = copy_from_iter(addr, max - pos, iter);
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else if (!hole)
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len = copy_to_iter(addr, max - pos, iter);
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else
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len = iov_iter_zero(max - pos, iter);
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if (!len)
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break;
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pos += len;
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addr += len;
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}
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return (pos == start) ? retval : pos - start;
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}
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/**
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* dax_do_io - Perform I/O to a DAX file
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* @rw: READ to read or WRITE to write
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* @iocb: The control block for this I/O
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* @inode: The file which the I/O is directed at
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* @iter: The addresses to do I/O from or to
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* @pos: The file offset where the I/O starts
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* @get_block: The filesystem method used to translate file offsets to blocks
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* @end_io: A filesystem callback for I/O completion
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* @flags: See below
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*
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* This function uses the same locking scheme as do_blockdev_direct_IO:
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* If @flags has DIO_LOCKING set, we assume that the i_mutex is held by the
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* caller for writes. For reads, we take and release the i_mutex ourselves.
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* If DIO_LOCKING is not set, the filesystem takes care of its own locking.
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* As with do_blockdev_direct_IO(), we increment i_dio_count while the I/O
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* is in progress.
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*/
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ssize_t dax_do_io(int rw, struct kiocb *iocb, struct inode *inode,
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struct iov_iter *iter, loff_t pos,
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get_block_t get_block, dio_iodone_t end_io, int flags)
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{
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struct buffer_head bh;
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ssize_t retval = -EINVAL;
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loff_t end = pos + iov_iter_count(iter);
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memset(&bh, 0, sizeof(bh));
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if ((flags & DIO_LOCKING) && (rw == READ)) {
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struct address_space *mapping = inode->i_mapping;
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mutex_lock(&inode->i_mutex);
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retval = filemap_write_and_wait_range(mapping, pos, end - 1);
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if (retval) {
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mutex_unlock(&inode->i_mutex);
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goto out;
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}
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}
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/* Protects against truncate */
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atomic_inc(&inode->i_dio_count);
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retval = dax_io(rw, inode, iter, pos, end, get_block, &bh);
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if ((flags & DIO_LOCKING) && (rw == READ))
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mutex_unlock(&inode->i_mutex);
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if ((retval > 0) && end_io)
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end_io(iocb, pos, retval, bh.b_private);
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inode_dio_done(inode);
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out:
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return retval;
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}
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EXPORT_SYMBOL_GPL(dax_do_io);
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@ -81,8 +81,10 @@ const struct file_operations ext2_file_operations = {
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#ifdef CONFIG_EXT2_FS_XIP
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const struct file_operations ext2_xip_file_operations = {
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.llseek = generic_file_llseek,
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.read = xip_file_read,
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.write = xip_file_write,
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.read = new_sync_read,
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.write = new_sync_write,
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.read_iter = generic_file_read_iter,
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.write_iter = generic_file_write_iter,
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.unlocked_ioctl = ext2_ioctl,
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#ifdef CONFIG_COMPAT
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.compat_ioctl = ext2_compat_ioctl,
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@ -859,7 +859,12 @@ ext2_direct_IO(int rw, struct kiocb *iocb, struct iov_iter *iter,
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size_t count = iov_iter_count(iter);
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ssize_t ret;
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ret = blockdev_direct_IO(rw, iocb, inode, iter, offset, ext2_get_block);
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if (IS_DAX(inode))
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ret = dax_do_io(rw, iocb, inode, iter, offset, ext2_get_block,
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NULL, DIO_LOCKING);
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else
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ret = blockdev_direct_IO(rw, iocb, inode, iter, offset,
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ext2_get_block);
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if (ret < 0 && (rw & WRITE))
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ext2_write_failed(mapping, offset + count);
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return ret;
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@ -888,6 +893,7 @@ const struct address_space_operations ext2_aops = {
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const struct address_space_operations ext2_aops_xip = {
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.bmap = ext2_bmap,
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.get_xip_mem = ext2_get_xip_mem,
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.direct_IO = ext2_direct_IO,
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};
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const struct address_space_operations ext2_nobh_aops = {
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@ -2587,12 +2587,11 @@ extern loff_t fixed_size_llseek(struct file *file, loff_t offset,
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extern int generic_file_open(struct inode * inode, struct file * filp);
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extern int nonseekable_open(struct inode * inode, struct file * filp);
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ssize_t dax_do_io(int rw, struct kiocb *, struct inode *, struct iov_iter *,
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loff_t, get_block_t, dio_iodone_t, int flags);
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#ifdef CONFIG_FS_XIP
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extern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len,
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loff_t *ppos);
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extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma);
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extern ssize_t xip_file_write(struct file *filp, const char __user *buf,
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size_t len, loff_t *ppos);
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extern int xip_truncate_page(struct address_space *mapping, loff_t from);
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#else
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static inline int xip_truncate_page(struct address_space *mapping, loff_t from)
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@ -2756,6 +2755,11 @@ extern int generic_show_options(struct seq_file *m, struct dentry *root);
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extern void save_mount_options(struct super_block *sb, char *options);
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extern void replace_mount_options(struct super_block *sb, char *options);
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static inline bool io_is_direct(struct file *filp)
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{
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return (filp->f_flags & O_DIRECT) || IS_DAX(file_inode(filp));
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}
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static inline ino_t parent_ino(struct dentry *dentry)
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{
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ino_t res;
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@ -1695,8 +1695,7 @@ generic_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
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loff_t *ppos = &iocb->ki_pos;
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loff_t pos = *ppos;
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/* coalesce the iovecs and go direct-to-BIO for O_DIRECT */
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if (file->f_flags & O_DIRECT) {
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if (io_is_direct(file)) {
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struct address_space *mapping = file->f_mapping;
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struct inode *inode = mapping->host;
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size_t count = iov_iter_count(iter);
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@ -2584,8 +2583,7 @@ ssize_t __generic_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
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if (err)
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goto out;
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/* coalesce the iovecs and go direct-to-BIO for O_DIRECT */
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if (unlikely(file->f_flags & O_DIRECT)) {
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if (io_is_direct(file)) {
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loff_t endbyte;
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written = generic_file_direct_write(iocb, from, pos);
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234
mm/filemap_xip.c
234
mm/filemap_xip.c
@ -42,119 +42,6 @@ static struct page *xip_sparse_page(void)
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return __xip_sparse_page;
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}
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/*
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* This is a file read routine for execute in place files, and uses
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* the mapping->a_ops->get_xip_mem() function for the actual low-level
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* stuff.
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*
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* Note the struct file* is not used at all. It may be NULL.
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*/
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static ssize_t
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do_xip_mapping_read(struct address_space *mapping,
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struct file_ra_state *_ra,
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struct file *filp,
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char __user *buf,
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size_t len,
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loff_t *ppos)
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{
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struct inode *inode = mapping->host;
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pgoff_t index, end_index;
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unsigned long offset;
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loff_t isize, pos;
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size_t copied = 0, error = 0;
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BUG_ON(!mapping->a_ops->get_xip_mem);
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pos = *ppos;
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index = pos >> PAGE_CACHE_SHIFT;
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offset = pos & ~PAGE_CACHE_MASK;
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isize = i_size_read(inode);
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if (!isize)
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goto out;
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end_index = (isize - 1) >> PAGE_CACHE_SHIFT;
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do {
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unsigned long nr, left;
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void *xip_mem;
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unsigned long xip_pfn;
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int zero = 0;
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/* nr is the maximum number of bytes to copy from this page */
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nr = PAGE_CACHE_SIZE;
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if (index >= end_index) {
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if (index > end_index)
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goto out;
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nr = ((isize - 1) & ~PAGE_CACHE_MASK) + 1;
|
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if (nr <= offset) {
|
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goto out;
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}
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}
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nr = nr - offset;
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if (nr > len - copied)
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nr = len - copied;
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error = mapping->a_ops->get_xip_mem(mapping, index, 0,
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&xip_mem, &xip_pfn);
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if (unlikely(error)) {
|
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if (error == -ENODATA) {
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/* sparse */
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zero = 1;
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} else
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goto out;
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}
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|
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/* If users can be writing to this page using arbitrary
|
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* virtual addresses, take care about potential aliasing
|
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* before reading the page on the kernel side.
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*/
|
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if (mapping_writably_mapped(mapping))
|
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/* address based flush */ ;
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|
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/*
|
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* Ok, we have the mem, so now we can copy it to user space...
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*
|
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* The actor routine returns how many bytes were actually used..
|
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* NOTE! This may not be the same as how much of a user buffer
|
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* we filled up (we may be padding etc), so we can only update
|
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* "pos" here (the actor routine has to update the user buffer
|
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* pointers and the remaining count).
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*/
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if (!zero)
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left = __copy_to_user(buf+copied, xip_mem+offset, nr);
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else
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left = __clear_user(buf + copied, nr);
|
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|
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if (left) {
|
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error = -EFAULT;
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goto out;
|
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}
|
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|
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copied += (nr - left);
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offset += (nr - left);
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index += offset >> PAGE_CACHE_SHIFT;
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offset &= ~PAGE_CACHE_MASK;
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} while (copied < len);
|
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out:
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*ppos = pos + copied;
|
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if (filp)
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file_accessed(filp);
|
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|
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return (copied ? copied : error);
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}
|
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|
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ssize_t
|
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xip_file_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos)
|
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{
|
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if (!access_ok(VERIFY_WRITE, buf, len))
|
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return -EFAULT;
|
||||
|
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return do_xip_mapping_read(filp->f_mapping, &filp->f_ra, filp,
|
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buf, len, ppos);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(xip_file_read);
|
||||
|
||||
/*
|
||||
* __xip_unmap is invoked from xip_unmap and xip_write
|
||||
*
|
||||
@ -341,127 +228,6 @@ int xip_file_mmap(struct file * file, struct vm_area_struct * vma)
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(xip_file_mmap);
|
||||
|
||||
static ssize_t
|
||||
__xip_file_write(struct file *filp, const char __user *buf,
|
||||
size_t count, loff_t pos, loff_t *ppos)
|
||||
{
|
||||
struct address_space * mapping = filp->f_mapping;
|
||||
const struct address_space_operations *a_ops = mapping->a_ops;
|
||||
struct inode *inode = mapping->host;
|
||||
long status = 0;
|
||||
size_t bytes;
|
||||
ssize_t written = 0;
|
||||
|
||||
BUG_ON(!mapping->a_ops->get_xip_mem);
|
||||
|
||||
do {
|
||||
unsigned long index;
|
||||
unsigned long offset;
|
||||
size_t copied;
|
||||
void *xip_mem;
|
||||
unsigned long xip_pfn;
|
||||
|
||||
offset = (pos & (PAGE_CACHE_SIZE -1)); /* Within page */
|
||||
index = pos >> PAGE_CACHE_SHIFT;
|
||||
bytes = PAGE_CACHE_SIZE - offset;
|
||||
if (bytes > count)
|
||||
bytes = count;
|
||||
|
||||
status = a_ops->get_xip_mem(mapping, index, 0,
|
||||
&xip_mem, &xip_pfn);
|
||||
if (status == -ENODATA) {
|
||||
/* we allocate a new page unmap it */
|
||||
mutex_lock(&xip_sparse_mutex);
|
||||
status = a_ops->get_xip_mem(mapping, index, 1,
|
||||
&xip_mem, &xip_pfn);
|
||||
mutex_unlock(&xip_sparse_mutex);
|
||||
if (!status)
|
||||
/* unmap page at pgoff from all other vmas */
|
||||
__xip_unmap(mapping, index);
|
||||
}
|
||||
|
||||
if (status)
|
||||
break;
|
||||
|
||||
copied = bytes -
|
||||
__copy_from_user_nocache(xip_mem + offset, buf, bytes);
|
||||
|
||||
if (likely(copied > 0)) {
|
||||
status = copied;
|
||||
|
||||
if (status >= 0) {
|
||||
written += status;
|
||||
count -= status;
|
||||
pos += status;
|
||||
buf += status;
|
||||
}
|
||||
}
|
||||
if (unlikely(copied != bytes))
|
||||
if (status >= 0)
|
||||
status = -EFAULT;
|
||||
if (status < 0)
|
||||
break;
|
||||
} while (count);
|
||||
*ppos = pos;
|
||||
/*
|
||||
* No need to use i_size_read() here, the i_size
|
||||
* cannot change under us because we hold i_mutex.
|
||||
*/
|
||||
if (pos > inode->i_size) {
|
||||
i_size_write(inode, pos);
|
||||
mark_inode_dirty(inode);
|
||||
}
|
||||
|
||||
return written ? written : status;
|
||||
}
|
||||
|
||||
ssize_t
|
||||
xip_file_write(struct file *filp, const char __user *buf, size_t len,
|
||||
loff_t *ppos)
|
||||
{
|
||||
struct address_space *mapping = filp->f_mapping;
|
||||
struct inode *inode = mapping->host;
|
||||
size_t count;
|
||||
loff_t pos;
|
||||
ssize_t ret;
|
||||
|
||||
mutex_lock(&inode->i_mutex);
|
||||
|
||||
if (!access_ok(VERIFY_READ, buf, len)) {
|
||||
ret=-EFAULT;
|
||||
goto out_up;
|
||||
}
|
||||
|
||||
pos = *ppos;
|
||||
count = len;
|
||||
|
||||
/* We can write back this queue in page reclaim */
|
||||
current->backing_dev_info = inode_to_bdi(inode);
|
||||
|
||||
ret = generic_write_checks(filp, &pos, &count, S_ISBLK(inode->i_mode));
|
||||
if (ret)
|
||||
goto out_backing;
|
||||
if (count == 0)
|
||||
goto out_backing;
|
||||
|
||||
ret = file_remove_suid(filp);
|
||||
if (ret)
|
||||
goto out_backing;
|
||||
|
||||
ret = file_update_time(filp);
|
||||
if (ret)
|
||||
goto out_backing;
|
||||
|
||||
ret = __xip_file_write (filp, buf, count, pos, ppos);
|
||||
|
||||
out_backing:
|
||||
current->backing_dev_info = NULL;
|
||||
out_up:
|
||||
mutex_unlock(&inode->i_mutex);
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(xip_file_write);
|
||||
|
||||
/*
|
||||
* truncate a page used for execute in place
|
||||
* functionality is analog to block_truncate_page but does use get_xip_mem
|
||||
|
||||
Loading…
Reference in New Issue
Block a user