From: Ross Zwisler <ross.zwisler@linux.intel.com>
To: Matthew Wilcox <matthew.r.wilcox@intel.com>
Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-mm@kvack.org, linux-ext4@vger.kernel.org
Subject: Re: [PATCH v5 22/22] XIP: Add support for unwritten extents
Date: Wed, 22 Jan 2014 15:51:56 -0700 (MST) [thread overview]
Message-ID: <alpine.OSX.2.00.1401221546240.70541@scrumpy> (raw)
In-Reply-To: <CEFD7DAD.22F65%matthew.r.wilcox@intel.com>
On Wed, 15 Jan 2014, Matthew Wilcox wrote:
> static ssize_t xip_io(int rw, struct inode *inode, const struct iovec
> *iov,
> loff_t start, loff_t end, unsigned nr_segs,
> get_block_t get_block, struct buffer_head *bh)
> @@ -103,21 +109,29 @@ static ssize_t xip_io(int rw, struct inode *inode,
> const struct iovec *iov,
> retval = get_block(inode, block, bh, rw == WRITE);
> if (retval)
> break;
> - if (buffer_mapped(bh)) {
> - retval = xip_get_addr(inode, bh, &addr);
> - if (retval < 0)
> - break;
> - addr += offset - (block << inode->i_blkbits);
> - hole = false;
> - size = retval;
> - } else {
> - if (rw == WRITE) {
> + if (rw == WRITE) {
> + if (!buffer_mapped(bh)) {
> retval = -EIO;
> break;
> }
> + hole = false;
> + } else {
> + hole = !buffer_written(bh);
> + }
> +
> + if (hole) {
> addr = NULL;
> - hole = true;
> size = bh->b_size;
> + } else {
> + unsigned first;
> + retval = xip_get_addr(inode, bh, &addr);
> + if (retval < 0)
> + break;
> + size = retval;
> + first = offset - (block << inode->i_blkbits);
> + if (buffer_unwritten(bh))
> + memset(addr, 0, first);
> + addr += first;
+ size -= first;
This is needed so that we don't overrun the XIP buffer we are given in the
event that our user buffer >= our XIP buffer and the start of our I/O isn't
block aligned.
You can add my
Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Thanks,
- Ross
next prev parent reply other threads:[~2014-01-22 22:51 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-16 1:24 [PATCH v5 00/22] Rewrite XIP code and add XIP support to ext4 Matthew Wilcox
2014-01-16 1:24 ` [PATCH v5 01/22] Fix XIP fault vs truncate race Matthew Wilcox
2014-01-16 1:24 ` [PATCH v5 02/22] Allow page fault handlers to perform the COW Matthew Wilcox
2014-01-16 1:24 ` [PATCH v5 03/22] axonram: Fix bug in direct_access Matthew Wilcox
2014-01-16 1:24 ` [PATCH v5 04/22] Change direct_access calling convention Matthew Wilcox
2014-01-16 1:24 ` [PATCH v5 05/22] Introduce IS_XIP(inode) Matthew Wilcox
2014-01-16 1:24 ` [PATCH v5 06/22] Treat XIP like O_DIRECT Matthew Wilcox
2014-01-31 16:59 ` Jan Kara
2014-01-16 1:24 ` [PATCH v5 07/22] Rewrite XIP page fault handling Matthew Wilcox
2014-01-16 1:24 ` [PATCH v5 08/22] Change xip_truncate_page to take a get_block parameter Matthew Wilcox
2014-01-16 1:24 ` [PATCH v5 09/22] Remove mm/filemap_xip.c Matthew Wilcox
2014-01-16 1:24 ` [PATCH v5 10/22] Remove get_xip_mem Matthew Wilcox
2014-01-16 1:46 ` Randy Dunlap
2014-01-27 13:26 ` Matthew Wilcox
2014-01-16 1:24 ` [PATCH v5 11/22] Replace ext2_clear_xip_target with xip_clear_blocks Matthew Wilcox
2014-01-16 1:24 ` [PATCH v5 12/22] ext2: Remove ext2_xip_verify_sb() Matthew Wilcox
2014-01-16 1:24 ` [PATCH v5 13/22] ext2: Remove ext2_use_xip Matthew Wilcox
2014-01-16 1:24 ` [PATCH v5 14/22] ext2: Remove xip.c and xip.h Matthew Wilcox
2014-01-16 1:24 ` [PATCH v5 15/22] Remove CONFIG_EXT2_FS_XIP Matthew Wilcox
2014-01-16 1:24 ` [PATCH v5 16/22] ext2: Remove ext2_aops_xip Matthew Wilcox
2014-01-16 1:24 ` [PATCH v5 17/22] xip: Add xip_zero_page_range Matthew Wilcox
2014-01-16 1:24 ` [PATCH v5 18/22] ext4: Make ext4_block_zero_page_range static Matthew Wilcox
2014-01-16 1:24 ` [PATCH v5 19/22] ext4: Add XIP functionality Matthew Wilcox
2014-01-16 1:24 ` [PATCH v5 20/22] ext4: Fix typos Matthew Wilcox
2014-01-16 1:24 ` [PATCH v5 21/22] xip: Add reporting of major faults Matthew Wilcox
2014-01-16 1:24 ` [PATCH v5 22/22] XIP: Add support for unwritten extents Matthew Wilcox
[not found] ` <CEFDA737.22F87%matthew.r.wilcox@intel.com>
2014-01-17 0:00 ` [PATCH v5 19/22] ext4: Add XIP functionality Ross Zwisler
[not found] ` <CEFD7DAD.22F65%matthew.r.wilcox@intel.com>
2014-01-22 22:51 ` Ross Zwisler [this message]
2014-01-23 12:08 ` [PATCH v5 22/22] XIP: Add support for unwritten extents Matthew Wilcox
2014-01-23 19:13 ` Ross Zwisler
[not found] ` <CF0C370C.235F1%willy@linux.intel.com>
2014-01-27 23:32 ` Ross Zwisler
2014-01-28 3:49 ` Matthew Wilcox
2014-01-23 7:48 ` [PATCH v5 00/22] Rewrite XIP code and add XIP support to ext4 Dave Chinner
2014-01-23 7:53 ` Dave Chinner
2014-01-23 9:01 ` Dave Chinner
2014-01-23 12:12 ` Wilcox, Matthew R
2014-01-28 6:06 ` Dave Chinner
2014-01-30 6:42 ` Dave Chinner
2014-01-30 9:25 ` Dave Chinner
2014-01-31 3:06 ` Dave Chinner
2014-01-31 5:45 ` Ross Zwisler
2014-01-31 13:04 ` Dave Chinner
[not found] ` <CF1FF3EB.24114%matthew.r.wilcox@intel.com>
2014-02-11 23:12 ` [PATCH v5 19/22] ext4: Add XIP functionality Ross Zwisler
2014-02-13 0:00 ` Ross Zwisler
[not found] ` <CF215477.24281%matthew.r.wilcox@intel.com>
2014-02-12 23:53 ` [PATCH v5 06/22] Treat XIP like O_DIRECT Ross Zwisler
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