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![Tejun Heo](/assets/img/avatar_default.png)
percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
1173 lines
31 KiB
C
1173 lines
31 KiB
C
/*
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* Copyright (C) 2007 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* 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
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include <linux/fs.h>
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#include <linux/pagemap.h>
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#include <linux/highmem.h>
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#include <linux/time.h>
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#include <linux/init.h>
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#include <linux/string.h>
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#include <linux/backing-dev.h>
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#include <linux/mpage.h>
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#include <linux/swap.h>
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#include <linux/writeback.h>
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#include <linux/statfs.h>
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#include <linux/compat.h>
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#include <linux/slab.h>
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#include "ctree.h"
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#include "disk-io.h"
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#include "transaction.h"
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#include "btrfs_inode.h"
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#include "ioctl.h"
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#include "print-tree.h"
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#include "tree-log.h"
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#include "locking.h"
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#include "compat.h"
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/* simple helper to fault in pages and copy. This should go away
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* and be replaced with calls into generic code.
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*/
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static noinline int btrfs_copy_from_user(loff_t pos, int num_pages,
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int write_bytes,
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struct page **prepared_pages,
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const char __user *buf)
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{
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long page_fault = 0;
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int i;
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int offset = pos & (PAGE_CACHE_SIZE - 1);
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for (i = 0; i < num_pages && write_bytes > 0; i++, offset = 0) {
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size_t count = min_t(size_t,
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PAGE_CACHE_SIZE - offset, write_bytes);
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struct page *page = prepared_pages[i];
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fault_in_pages_readable(buf, count);
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/* Copy data from userspace to the current page */
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kmap(page);
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page_fault = __copy_from_user(page_address(page) + offset,
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buf, count);
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/* Flush processor's dcache for this page */
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flush_dcache_page(page);
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kunmap(page);
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buf += count;
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write_bytes -= count;
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if (page_fault)
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break;
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}
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return page_fault ? -EFAULT : 0;
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}
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/*
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* unlocks pages after btrfs_file_write is done with them
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*/
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static noinline void btrfs_drop_pages(struct page **pages, size_t num_pages)
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{
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size_t i;
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for (i = 0; i < num_pages; i++) {
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if (!pages[i])
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break;
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/* page checked is some magic around finding pages that
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* have been modified without going through btrfs_set_page_dirty
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* clear it here
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*/
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ClearPageChecked(pages[i]);
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unlock_page(pages[i]);
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mark_page_accessed(pages[i]);
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page_cache_release(pages[i]);
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}
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}
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/*
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* after copy_from_user, pages need to be dirtied and we need to make
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* sure holes are created between the current EOF and the start of
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* any next extents (if required).
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*
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* this also makes the decision about creating an inline extent vs
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* doing real data extents, marking pages dirty and delalloc as required.
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*/
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static noinline int dirty_and_release_pages(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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struct file *file,
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struct page **pages,
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size_t num_pages,
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loff_t pos,
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size_t write_bytes)
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{
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int err = 0;
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int i;
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struct inode *inode = fdentry(file)->d_inode;
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u64 num_bytes;
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u64 start_pos;
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u64 end_of_last_block;
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u64 end_pos = pos + write_bytes;
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loff_t isize = i_size_read(inode);
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start_pos = pos & ~((u64)root->sectorsize - 1);
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num_bytes = (write_bytes + pos - start_pos +
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root->sectorsize - 1) & ~((u64)root->sectorsize - 1);
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end_of_last_block = start_pos + num_bytes - 1;
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err = btrfs_set_extent_delalloc(inode, start_pos, end_of_last_block,
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NULL);
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if (err)
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return err;
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for (i = 0; i < num_pages; i++) {
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struct page *p = pages[i];
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SetPageUptodate(p);
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ClearPageChecked(p);
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set_page_dirty(p);
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}
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if (end_pos > isize) {
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i_size_write(inode, end_pos);
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/* we've only changed i_size in ram, and we haven't updated
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* the disk i_size. There is no need to log the inode
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* at this time.
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*/
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}
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return err;
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}
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/*
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* this drops all the extents in the cache that intersect the range
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* [start, end]. Existing extents are split as required.
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*/
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int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
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int skip_pinned)
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{
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struct extent_map *em;
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struct extent_map *split = NULL;
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struct extent_map *split2 = NULL;
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struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
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u64 len = end - start + 1;
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int ret;
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int testend = 1;
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unsigned long flags;
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int compressed = 0;
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WARN_ON(end < start);
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if (end == (u64)-1) {
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len = (u64)-1;
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testend = 0;
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}
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while (1) {
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if (!split)
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split = alloc_extent_map(GFP_NOFS);
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if (!split2)
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split2 = alloc_extent_map(GFP_NOFS);
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write_lock(&em_tree->lock);
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em = lookup_extent_mapping(em_tree, start, len);
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if (!em) {
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write_unlock(&em_tree->lock);
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break;
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}
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flags = em->flags;
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if (skip_pinned && test_bit(EXTENT_FLAG_PINNED, &em->flags)) {
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if (testend && em->start + em->len >= start + len) {
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free_extent_map(em);
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write_unlock(&em_tree->lock);
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break;
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}
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start = em->start + em->len;
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if (testend)
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len = start + len - (em->start + em->len);
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free_extent_map(em);
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write_unlock(&em_tree->lock);
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continue;
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}
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compressed = test_bit(EXTENT_FLAG_COMPRESSED, &em->flags);
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clear_bit(EXTENT_FLAG_PINNED, &em->flags);
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remove_extent_mapping(em_tree, em);
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if (em->block_start < EXTENT_MAP_LAST_BYTE &&
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em->start < start) {
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split->start = em->start;
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split->len = start - em->start;
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split->orig_start = em->orig_start;
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split->block_start = em->block_start;
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if (compressed)
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split->block_len = em->block_len;
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else
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split->block_len = split->len;
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split->bdev = em->bdev;
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split->flags = flags;
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ret = add_extent_mapping(em_tree, split);
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BUG_ON(ret);
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free_extent_map(split);
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split = split2;
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split2 = NULL;
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}
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if (em->block_start < EXTENT_MAP_LAST_BYTE &&
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testend && em->start + em->len > start + len) {
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u64 diff = start + len - em->start;
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split->start = start + len;
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split->len = em->start + em->len - (start + len);
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split->bdev = em->bdev;
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split->flags = flags;
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if (compressed) {
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split->block_len = em->block_len;
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split->block_start = em->block_start;
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split->orig_start = em->orig_start;
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} else {
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split->block_len = split->len;
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split->block_start = em->block_start + diff;
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split->orig_start = split->start;
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}
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ret = add_extent_mapping(em_tree, split);
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BUG_ON(ret);
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free_extent_map(split);
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split = NULL;
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}
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write_unlock(&em_tree->lock);
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/* once for us */
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free_extent_map(em);
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/* once for the tree*/
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free_extent_map(em);
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}
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if (split)
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free_extent_map(split);
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if (split2)
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free_extent_map(split2);
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return 0;
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}
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/*
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* this is very complex, but the basic idea is to drop all extents
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* in the range start - end. hint_block is filled in with a block number
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* that would be a good hint to the block allocator for this file.
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*
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* If an extent intersects the range but is not entirely inside the range
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* it is either truncated or split. Anything entirely inside the range
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* is deleted from the tree.
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*/
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int btrfs_drop_extents(struct btrfs_trans_handle *trans, struct inode *inode,
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u64 start, u64 end, u64 *hint_byte, int drop_cache)
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{
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struct btrfs_root *root = BTRFS_I(inode)->root;
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struct extent_buffer *leaf;
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struct btrfs_file_extent_item *fi;
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struct btrfs_path *path;
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struct btrfs_key key;
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struct btrfs_key new_key;
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u64 search_start = start;
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u64 disk_bytenr = 0;
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u64 num_bytes = 0;
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u64 extent_offset = 0;
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u64 extent_end = 0;
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int del_nr = 0;
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int del_slot = 0;
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int extent_type;
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int recow;
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int ret;
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if (drop_cache)
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btrfs_drop_extent_cache(inode, start, end - 1, 0);
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path = btrfs_alloc_path();
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if (!path)
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return -ENOMEM;
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while (1) {
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recow = 0;
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ret = btrfs_lookup_file_extent(trans, root, path, inode->i_ino,
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search_start, -1);
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if (ret < 0)
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break;
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if (ret > 0 && path->slots[0] > 0 && search_start == start) {
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leaf = path->nodes[0];
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btrfs_item_key_to_cpu(leaf, &key, path->slots[0] - 1);
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if (key.objectid == inode->i_ino &&
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key.type == BTRFS_EXTENT_DATA_KEY)
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path->slots[0]--;
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}
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ret = 0;
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next_slot:
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leaf = path->nodes[0];
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if (path->slots[0] >= btrfs_header_nritems(leaf)) {
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BUG_ON(del_nr > 0);
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ret = btrfs_next_leaf(root, path);
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if (ret < 0)
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break;
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if (ret > 0) {
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ret = 0;
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break;
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}
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leaf = path->nodes[0];
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recow = 1;
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}
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btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
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if (key.objectid > inode->i_ino ||
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key.type > BTRFS_EXTENT_DATA_KEY || key.offset >= end)
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break;
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fi = btrfs_item_ptr(leaf, path->slots[0],
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struct btrfs_file_extent_item);
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extent_type = btrfs_file_extent_type(leaf, fi);
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if (extent_type == BTRFS_FILE_EXTENT_REG ||
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extent_type == BTRFS_FILE_EXTENT_PREALLOC) {
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disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
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num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi);
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extent_offset = btrfs_file_extent_offset(leaf, fi);
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extent_end = key.offset +
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btrfs_file_extent_num_bytes(leaf, fi);
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} else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
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extent_end = key.offset +
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btrfs_file_extent_inline_len(leaf, fi);
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} else {
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WARN_ON(1);
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extent_end = search_start;
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}
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if (extent_end <= search_start) {
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path->slots[0]++;
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goto next_slot;
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}
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search_start = max(key.offset, start);
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if (recow) {
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btrfs_release_path(root, path);
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continue;
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}
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/*
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* | - range to drop - |
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* | -------- extent -------- |
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*/
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if (start > key.offset && end < extent_end) {
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BUG_ON(del_nr > 0);
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BUG_ON(extent_type == BTRFS_FILE_EXTENT_INLINE);
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memcpy(&new_key, &key, sizeof(new_key));
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new_key.offset = start;
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ret = btrfs_duplicate_item(trans, root, path,
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&new_key);
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if (ret == -EAGAIN) {
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btrfs_release_path(root, path);
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continue;
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}
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if (ret < 0)
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break;
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leaf = path->nodes[0];
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fi = btrfs_item_ptr(leaf, path->slots[0] - 1,
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struct btrfs_file_extent_item);
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btrfs_set_file_extent_num_bytes(leaf, fi,
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start - key.offset);
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fi = btrfs_item_ptr(leaf, path->slots[0],
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struct btrfs_file_extent_item);
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extent_offset += start - key.offset;
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btrfs_set_file_extent_offset(leaf, fi, extent_offset);
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btrfs_set_file_extent_num_bytes(leaf, fi,
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extent_end - start);
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btrfs_mark_buffer_dirty(leaf);
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|
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if (disk_bytenr > 0) {
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ret = btrfs_inc_extent_ref(trans, root,
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disk_bytenr, num_bytes, 0,
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root->root_key.objectid,
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new_key.objectid,
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start - extent_offset);
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BUG_ON(ret);
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*hint_byte = disk_bytenr;
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}
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key.offset = start;
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}
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/*
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* | ---- range to drop ----- |
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* | -------- extent -------- |
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*/
|
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if (start <= key.offset && end < extent_end) {
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BUG_ON(extent_type == BTRFS_FILE_EXTENT_INLINE);
|
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|
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memcpy(&new_key, &key, sizeof(new_key));
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new_key.offset = end;
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btrfs_set_item_key_safe(trans, root, path, &new_key);
|
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|
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extent_offset += end - key.offset;
|
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btrfs_set_file_extent_offset(leaf, fi, extent_offset);
|
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btrfs_set_file_extent_num_bytes(leaf, fi,
|
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extent_end - end);
|
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btrfs_mark_buffer_dirty(leaf);
|
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if (disk_bytenr > 0) {
|
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inode_sub_bytes(inode, end - key.offset);
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*hint_byte = disk_bytenr;
|
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}
|
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break;
|
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}
|
|
|
|
search_start = extent_end;
|
|
/*
|
|
* | ---- range to drop ----- |
|
|
* | -------- extent -------- |
|
|
*/
|
|
if (start > key.offset && end >= extent_end) {
|
|
BUG_ON(del_nr > 0);
|
|
BUG_ON(extent_type == BTRFS_FILE_EXTENT_INLINE);
|
|
|
|
btrfs_set_file_extent_num_bytes(leaf, fi,
|
|
start - key.offset);
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
if (disk_bytenr > 0) {
|
|
inode_sub_bytes(inode, extent_end - start);
|
|
*hint_byte = disk_bytenr;
|
|
}
|
|
if (end == extent_end)
|
|
break;
|
|
|
|
path->slots[0]++;
|
|
goto next_slot;
|
|
}
|
|
|
|
/*
|
|
* | ---- range to drop ----- |
|
|
* | ------ extent ------ |
|
|
*/
|
|
if (start <= key.offset && end >= extent_end) {
|
|
if (del_nr == 0) {
|
|
del_slot = path->slots[0];
|
|
del_nr = 1;
|
|
} else {
|
|
BUG_ON(del_slot + del_nr != path->slots[0]);
|
|
del_nr++;
|
|
}
|
|
|
|
if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
|
|
inode_sub_bytes(inode,
|
|
extent_end - key.offset);
|
|
extent_end = ALIGN(extent_end,
|
|
root->sectorsize);
|
|
} else if (disk_bytenr > 0) {
|
|
ret = btrfs_free_extent(trans, root,
|
|
disk_bytenr, num_bytes, 0,
|
|
root->root_key.objectid,
|
|
key.objectid, key.offset -
|
|
extent_offset);
|
|
BUG_ON(ret);
|
|
inode_sub_bytes(inode,
|
|
extent_end - key.offset);
|
|
*hint_byte = disk_bytenr;
|
|
}
|
|
|
|
if (end == extent_end)
|
|
break;
|
|
|
|
if (path->slots[0] + 1 < btrfs_header_nritems(leaf)) {
|
|
path->slots[0]++;
|
|
goto next_slot;
|
|
}
|
|
|
|
ret = btrfs_del_items(trans, root, path, del_slot,
|
|
del_nr);
|
|
BUG_ON(ret);
|
|
|
|
del_nr = 0;
|
|
del_slot = 0;
|
|
|
|
btrfs_release_path(root, path);
|
|
continue;
|
|
}
|
|
|
|
BUG_ON(1);
|
|
}
|
|
|
|
if (del_nr > 0) {
|
|
ret = btrfs_del_items(trans, root, path, del_slot, del_nr);
|
|
BUG_ON(ret);
|
|
}
|
|
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
static int extent_mergeable(struct extent_buffer *leaf, int slot,
|
|
u64 objectid, u64 bytenr, u64 orig_offset,
|
|
u64 *start, u64 *end)
|
|
{
|
|
struct btrfs_file_extent_item *fi;
|
|
struct btrfs_key key;
|
|
u64 extent_end;
|
|
|
|
if (slot < 0 || slot >= btrfs_header_nritems(leaf))
|
|
return 0;
|
|
|
|
btrfs_item_key_to_cpu(leaf, &key, slot);
|
|
if (key.objectid != objectid || key.type != BTRFS_EXTENT_DATA_KEY)
|
|
return 0;
|
|
|
|
fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item);
|
|
if (btrfs_file_extent_type(leaf, fi) != BTRFS_FILE_EXTENT_REG ||
|
|
btrfs_file_extent_disk_bytenr(leaf, fi) != bytenr ||
|
|
btrfs_file_extent_offset(leaf, fi) != key.offset - orig_offset ||
|
|
btrfs_file_extent_compression(leaf, fi) ||
|
|
btrfs_file_extent_encryption(leaf, fi) ||
|
|
btrfs_file_extent_other_encoding(leaf, fi))
|
|
return 0;
|
|
|
|
extent_end = key.offset + btrfs_file_extent_num_bytes(leaf, fi);
|
|
if ((*start && *start != key.offset) || (*end && *end != extent_end))
|
|
return 0;
|
|
|
|
*start = key.offset;
|
|
*end = extent_end;
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Mark extent in the range start - end as written.
|
|
*
|
|
* This changes extent type from 'pre-allocated' to 'regular'. If only
|
|
* part of extent is marked as written, the extent will be split into
|
|
* two or three.
|
|
*/
|
|
int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
|
|
struct inode *inode, u64 start, u64 end)
|
|
{
|
|
struct btrfs_root *root = BTRFS_I(inode)->root;
|
|
struct extent_buffer *leaf;
|
|
struct btrfs_path *path;
|
|
struct btrfs_file_extent_item *fi;
|
|
struct btrfs_key key;
|
|
struct btrfs_key new_key;
|
|
u64 bytenr;
|
|
u64 num_bytes;
|
|
u64 extent_end;
|
|
u64 orig_offset;
|
|
u64 other_start;
|
|
u64 other_end;
|
|
u64 split;
|
|
int del_nr = 0;
|
|
int del_slot = 0;
|
|
int recow;
|
|
int ret;
|
|
|
|
btrfs_drop_extent_cache(inode, start, end - 1, 0);
|
|
|
|
path = btrfs_alloc_path();
|
|
BUG_ON(!path);
|
|
again:
|
|
recow = 0;
|
|
split = start;
|
|
key.objectid = inode->i_ino;
|
|
key.type = BTRFS_EXTENT_DATA_KEY;
|
|
key.offset = split;
|
|
|
|
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
|
|
if (ret > 0 && path->slots[0] > 0)
|
|
path->slots[0]--;
|
|
|
|
leaf = path->nodes[0];
|
|
btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
|
|
BUG_ON(key.objectid != inode->i_ino ||
|
|
key.type != BTRFS_EXTENT_DATA_KEY);
|
|
fi = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_file_extent_item);
|
|
BUG_ON(btrfs_file_extent_type(leaf, fi) !=
|
|
BTRFS_FILE_EXTENT_PREALLOC);
|
|
extent_end = key.offset + btrfs_file_extent_num_bytes(leaf, fi);
|
|
BUG_ON(key.offset > start || extent_end < end);
|
|
|
|
bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
|
|
num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi);
|
|
orig_offset = key.offset - btrfs_file_extent_offset(leaf, fi);
|
|
memcpy(&new_key, &key, sizeof(new_key));
|
|
|
|
if (start == key.offset && end < extent_end) {
|
|
other_start = 0;
|
|
other_end = start;
|
|
if (extent_mergeable(leaf, path->slots[0] - 1,
|
|
inode->i_ino, bytenr, orig_offset,
|
|
&other_start, &other_end)) {
|
|
new_key.offset = end;
|
|
btrfs_set_item_key_safe(trans, root, path, &new_key);
|
|
fi = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_file_extent_item);
|
|
btrfs_set_file_extent_num_bytes(leaf, fi,
|
|
extent_end - end);
|
|
btrfs_set_file_extent_offset(leaf, fi,
|
|
end - orig_offset);
|
|
fi = btrfs_item_ptr(leaf, path->slots[0] - 1,
|
|
struct btrfs_file_extent_item);
|
|
btrfs_set_file_extent_num_bytes(leaf, fi,
|
|
end - other_start);
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if (start > key.offset && end == extent_end) {
|
|
other_start = end;
|
|
other_end = 0;
|
|
if (extent_mergeable(leaf, path->slots[0] + 1,
|
|
inode->i_ino, bytenr, orig_offset,
|
|
&other_start, &other_end)) {
|
|
fi = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_file_extent_item);
|
|
btrfs_set_file_extent_num_bytes(leaf, fi,
|
|
start - key.offset);
|
|
path->slots[0]++;
|
|
new_key.offset = start;
|
|
btrfs_set_item_key_safe(trans, root, path, &new_key);
|
|
|
|
fi = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_file_extent_item);
|
|
btrfs_set_file_extent_num_bytes(leaf, fi,
|
|
other_end - start);
|
|
btrfs_set_file_extent_offset(leaf, fi,
|
|
start - orig_offset);
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
while (start > key.offset || end < extent_end) {
|
|
if (key.offset == start)
|
|
split = end;
|
|
|
|
new_key.offset = split;
|
|
ret = btrfs_duplicate_item(trans, root, path, &new_key);
|
|
if (ret == -EAGAIN) {
|
|
btrfs_release_path(root, path);
|
|
goto again;
|
|
}
|
|
BUG_ON(ret < 0);
|
|
|
|
leaf = path->nodes[0];
|
|
fi = btrfs_item_ptr(leaf, path->slots[0] - 1,
|
|
struct btrfs_file_extent_item);
|
|
btrfs_set_file_extent_num_bytes(leaf, fi,
|
|
split - key.offset);
|
|
|
|
fi = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_file_extent_item);
|
|
|
|
btrfs_set_file_extent_offset(leaf, fi, split - orig_offset);
|
|
btrfs_set_file_extent_num_bytes(leaf, fi,
|
|
extent_end - split);
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
|
|
ret = btrfs_inc_extent_ref(trans, root, bytenr, num_bytes, 0,
|
|
root->root_key.objectid,
|
|
inode->i_ino, orig_offset);
|
|
BUG_ON(ret);
|
|
|
|
if (split == start) {
|
|
key.offset = start;
|
|
} else {
|
|
BUG_ON(start != key.offset);
|
|
path->slots[0]--;
|
|
extent_end = end;
|
|
}
|
|
recow = 1;
|
|
}
|
|
|
|
other_start = end;
|
|
other_end = 0;
|
|
if (extent_mergeable(leaf, path->slots[0] + 1,
|
|
inode->i_ino, bytenr, orig_offset,
|
|
&other_start, &other_end)) {
|
|
if (recow) {
|
|
btrfs_release_path(root, path);
|
|
goto again;
|
|
}
|
|
extent_end = other_end;
|
|
del_slot = path->slots[0] + 1;
|
|
del_nr++;
|
|
ret = btrfs_free_extent(trans, root, bytenr, num_bytes,
|
|
0, root->root_key.objectid,
|
|
inode->i_ino, orig_offset);
|
|
BUG_ON(ret);
|
|
}
|
|
other_start = 0;
|
|
other_end = start;
|
|
if (extent_mergeable(leaf, path->slots[0] - 1,
|
|
inode->i_ino, bytenr, orig_offset,
|
|
&other_start, &other_end)) {
|
|
if (recow) {
|
|
btrfs_release_path(root, path);
|
|
goto again;
|
|
}
|
|
key.offset = other_start;
|
|
del_slot = path->slots[0];
|
|
del_nr++;
|
|
ret = btrfs_free_extent(trans, root, bytenr, num_bytes,
|
|
0, root->root_key.objectid,
|
|
inode->i_ino, orig_offset);
|
|
BUG_ON(ret);
|
|
}
|
|
if (del_nr == 0) {
|
|
fi = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_file_extent_item);
|
|
btrfs_set_file_extent_type(leaf, fi,
|
|
BTRFS_FILE_EXTENT_REG);
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
} else {
|
|
fi = btrfs_item_ptr(leaf, del_slot - 1,
|
|
struct btrfs_file_extent_item);
|
|
btrfs_set_file_extent_type(leaf, fi,
|
|
BTRFS_FILE_EXTENT_REG);
|
|
btrfs_set_file_extent_num_bytes(leaf, fi,
|
|
extent_end - key.offset);
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
|
|
ret = btrfs_del_items(trans, root, path, del_slot, del_nr);
|
|
BUG_ON(ret);
|
|
}
|
|
out:
|
|
btrfs_free_path(path);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* this gets pages into the page cache and locks them down, it also properly
|
|
* waits for data=ordered extents to finish before allowing the pages to be
|
|
* modified.
|
|
*/
|
|
static noinline int prepare_pages(struct btrfs_root *root, struct file *file,
|
|
struct page **pages, size_t num_pages,
|
|
loff_t pos, unsigned long first_index,
|
|
unsigned long last_index, size_t write_bytes)
|
|
{
|
|
struct extent_state *cached_state = NULL;
|
|
int i;
|
|
unsigned long index = pos >> PAGE_CACHE_SHIFT;
|
|
struct inode *inode = fdentry(file)->d_inode;
|
|
int err = 0;
|
|
u64 start_pos;
|
|
u64 last_pos;
|
|
|
|
start_pos = pos & ~((u64)root->sectorsize - 1);
|
|
last_pos = ((u64)index + num_pages) << PAGE_CACHE_SHIFT;
|
|
|
|
if (start_pos > inode->i_size) {
|
|
err = btrfs_cont_expand(inode, start_pos);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
memset(pages, 0, num_pages * sizeof(struct page *));
|
|
again:
|
|
for (i = 0; i < num_pages; i++) {
|
|
pages[i] = grab_cache_page(inode->i_mapping, index + i);
|
|
if (!pages[i]) {
|
|
err = -ENOMEM;
|
|
BUG_ON(1);
|
|
}
|
|
wait_on_page_writeback(pages[i]);
|
|
}
|
|
if (start_pos < inode->i_size) {
|
|
struct btrfs_ordered_extent *ordered;
|
|
lock_extent_bits(&BTRFS_I(inode)->io_tree,
|
|
start_pos, last_pos - 1, 0, &cached_state,
|
|
GFP_NOFS);
|
|
ordered = btrfs_lookup_first_ordered_extent(inode,
|
|
last_pos - 1);
|
|
if (ordered &&
|
|
ordered->file_offset + ordered->len > start_pos &&
|
|
ordered->file_offset < last_pos) {
|
|
btrfs_put_ordered_extent(ordered);
|
|
unlock_extent_cached(&BTRFS_I(inode)->io_tree,
|
|
start_pos, last_pos - 1,
|
|
&cached_state, GFP_NOFS);
|
|
for (i = 0; i < num_pages; i++) {
|
|
unlock_page(pages[i]);
|
|
page_cache_release(pages[i]);
|
|
}
|
|
btrfs_wait_ordered_range(inode, start_pos,
|
|
last_pos - start_pos);
|
|
goto again;
|
|
}
|
|
if (ordered)
|
|
btrfs_put_ordered_extent(ordered);
|
|
|
|
clear_extent_bit(&BTRFS_I(inode)->io_tree, start_pos,
|
|
last_pos - 1, EXTENT_DIRTY | EXTENT_DELALLOC |
|
|
EXTENT_DO_ACCOUNTING, 0, 0, &cached_state,
|
|
GFP_NOFS);
|
|
unlock_extent_cached(&BTRFS_I(inode)->io_tree,
|
|
start_pos, last_pos - 1, &cached_state,
|
|
GFP_NOFS);
|
|
}
|
|
for (i = 0; i < num_pages; i++) {
|
|
clear_page_dirty_for_io(pages[i]);
|
|
set_page_extent_mapped(pages[i]);
|
|
WARN_ON(!PageLocked(pages[i]));
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
loff_t pos;
|
|
loff_t start_pos;
|
|
ssize_t num_written = 0;
|
|
ssize_t err = 0;
|
|
int ret = 0;
|
|
struct inode *inode = fdentry(file)->d_inode;
|
|
struct btrfs_root *root = BTRFS_I(inode)->root;
|
|
struct page **pages = NULL;
|
|
int nrptrs;
|
|
struct page *pinned[2];
|
|
unsigned long first_index;
|
|
unsigned long last_index;
|
|
int will_write;
|
|
|
|
will_write = ((file->f_flags & O_DSYNC) || IS_SYNC(inode) ||
|
|
(file->f_flags & O_DIRECT));
|
|
|
|
nrptrs = min((count + PAGE_CACHE_SIZE - 1) / PAGE_CACHE_SIZE,
|
|
PAGE_CACHE_SIZE / (sizeof(struct page *)));
|
|
pinned[0] = NULL;
|
|
pinned[1] = NULL;
|
|
|
|
pos = *ppos;
|
|
start_pos = pos;
|
|
|
|
vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
|
|
|
|
/* do the reserve before the mutex lock in case we have to do some
|
|
* flushing. We wouldn't deadlock, but this is more polite.
|
|
*/
|
|
err = btrfs_reserve_metadata_for_delalloc(root, inode, 1);
|
|
if (err)
|
|
goto out_nolock;
|
|
|
|
mutex_lock(&inode->i_mutex);
|
|
|
|
current->backing_dev_info = inode->i_mapping->backing_dev_info;
|
|
err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
|
|
if (err)
|
|
goto out;
|
|
|
|
if (count == 0)
|
|
goto out;
|
|
|
|
err = file_remove_suid(file);
|
|
if (err)
|
|
goto out;
|
|
|
|
file_update_time(file);
|
|
|
|
pages = kmalloc(nrptrs * sizeof(struct page *), GFP_KERNEL);
|
|
|
|
/* generic_write_checks can change our pos */
|
|
start_pos = pos;
|
|
|
|
BTRFS_I(inode)->sequence++;
|
|
first_index = pos >> PAGE_CACHE_SHIFT;
|
|
last_index = (pos + count) >> PAGE_CACHE_SHIFT;
|
|
|
|
/*
|
|
* there are lots of better ways to do this, but this code
|
|
* makes sure the first and last page in the file range are
|
|
* up to date and ready for cow
|
|
*/
|
|
if ((pos & (PAGE_CACHE_SIZE - 1))) {
|
|
pinned[0] = grab_cache_page(inode->i_mapping, first_index);
|
|
if (!PageUptodate(pinned[0])) {
|
|
ret = btrfs_readpage(NULL, pinned[0]);
|
|
BUG_ON(ret);
|
|
wait_on_page_locked(pinned[0]);
|
|
} else {
|
|
unlock_page(pinned[0]);
|
|
}
|
|
}
|
|
if ((pos + count) & (PAGE_CACHE_SIZE - 1)) {
|
|
pinned[1] = grab_cache_page(inode->i_mapping, last_index);
|
|
if (!PageUptodate(pinned[1])) {
|
|
ret = btrfs_readpage(NULL, pinned[1]);
|
|
BUG_ON(ret);
|
|
wait_on_page_locked(pinned[1]);
|
|
} else {
|
|
unlock_page(pinned[1]);
|
|
}
|
|
}
|
|
|
|
while (count > 0) {
|
|
size_t offset = pos & (PAGE_CACHE_SIZE - 1);
|
|
size_t write_bytes = min(count, nrptrs *
|
|
(size_t)PAGE_CACHE_SIZE -
|
|
offset);
|
|
size_t num_pages = (write_bytes + PAGE_CACHE_SIZE - 1) >>
|
|
PAGE_CACHE_SHIFT;
|
|
|
|
WARN_ON(num_pages > nrptrs);
|
|
memset(pages, 0, sizeof(struct page *) * nrptrs);
|
|
|
|
ret = btrfs_check_data_free_space(root, inode, write_bytes);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = prepare_pages(root, file, pages, num_pages,
|
|
pos, first_index, last_index,
|
|
write_bytes);
|
|
if (ret) {
|
|
btrfs_free_reserved_data_space(root, inode,
|
|
write_bytes);
|
|
goto out;
|
|
}
|
|
|
|
ret = btrfs_copy_from_user(pos, num_pages,
|
|
write_bytes, pages, buf);
|
|
if (ret) {
|
|
btrfs_free_reserved_data_space(root, inode,
|
|
write_bytes);
|
|
btrfs_drop_pages(pages, num_pages);
|
|
goto out;
|
|
}
|
|
|
|
ret = dirty_and_release_pages(NULL, root, file, pages,
|
|
num_pages, pos, write_bytes);
|
|
btrfs_drop_pages(pages, num_pages);
|
|
if (ret) {
|
|
btrfs_free_reserved_data_space(root, inode,
|
|
write_bytes);
|
|
goto out;
|
|
}
|
|
|
|
if (will_write) {
|
|
filemap_fdatawrite_range(inode->i_mapping, pos,
|
|
pos + write_bytes - 1);
|
|
} else {
|
|
balance_dirty_pages_ratelimited_nr(inode->i_mapping,
|
|
num_pages);
|
|
if (num_pages <
|
|
(root->leafsize >> PAGE_CACHE_SHIFT) + 1)
|
|
btrfs_btree_balance_dirty(root, 1);
|
|
btrfs_throttle(root);
|
|
}
|
|
|
|
buf += write_bytes;
|
|
count -= write_bytes;
|
|
pos += write_bytes;
|
|
num_written += write_bytes;
|
|
|
|
cond_resched();
|
|
}
|
|
out:
|
|
mutex_unlock(&inode->i_mutex);
|
|
if (ret)
|
|
err = ret;
|
|
btrfs_unreserve_metadata_for_delalloc(root, inode, 1);
|
|
|
|
out_nolock:
|
|
kfree(pages);
|
|
if (pinned[0])
|
|
page_cache_release(pinned[0]);
|
|
if (pinned[1])
|
|
page_cache_release(pinned[1]);
|
|
*ppos = pos;
|
|
|
|
/*
|
|
* we want to make sure fsync finds this change
|
|
* but we haven't joined a transaction running right now.
|
|
*
|
|
* Later on, someone is sure to update the inode and get the
|
|
* real transid recorded.
|
|
*
|
|
* We set last_trans now to the fs_info generation + 1,
|
|
* this will either be one more than the running transaction
|
|
* or the generation used for the next transaction if there isn't
|
|
* one running right now.
|
|
*/
|
|
BTRFS_I(inode)->last_trans = root->fs_info->generation + 1;
|
|
|
|
if (num_written > 0 && will_write) {
|
|
struct btrfs_trans_handle *trans;
|
|
|
|
err = btrfs_wait_ordered_range(inode, start_pos, num_written);
|
|
if (err)
|
|
num_written = err;
|
|
|
|
if ((file->f_flags & O_DSYNC) || IS_SYNC(inode)) {
|
|
trans = btrfs_start_transaction(root, 1);
|
|
ret = btrfs_log_dentry_safe(trans, root,
|
|
file->f_dentry);
|
|
if (ret == 0) {
|
|
ret = btrfs_sync_log(trans, root);
|
|
if (ret == 0)
|
|
btrfs_end_transaction(trans, root);
|
|
else
|
|
btrfs_commit_transaction(trans, root);
|
|
} else if (ret != BTRFS_NO_LOG_SYNC) {
|
|
btrfs_commit_transaction(trans, root);
|
|
} else {
|
|
btrfs_end_transaction(trans, root);
|
|
}
|
|
}
|
|
if (file->f_flags & O_DIRECT) {
|
|
invalidate_mapping_pages(inode->i_mapping,
|
|
start_pos >> PAGE_CACHE_SHIFT,
|
|
(start_pos + num_written - 1) >> PAGE_CACHE_SHIFT);
|
|
}
|
|
}
|
|
current->backing_dev_info = NULL;
|
|
return num_written ? num_written : err;
|
|
}
|
|
|
|
int btrfs_release_file(struct inode *inode, struct file *filp)
|
|
{
|
|
/*
|
|
* ordered_data_close is set by settattr when we are about to truncate
|
|
* a file from a non-zero size to a zero size. This tries to
|
|
* flush down new bytes that may have been written if the
|
|
* application were using truncate to replace a file in place.
|
|
*/
|
|
if (BTRFS_I(inode)->ordered_data_close) {
|
|
BTRFS_I(inode)->ordered_data_close = 0;
|
|
btrfs_add_ordered_operation(NULL, BTRFS_I(inode)->root, inode);
|
|
if (inode->i_size > BTRFS_ORDERED_OPERATIONS_FLUSH_LIMIT)
|
|
filemap_flush(inode->i_mapping);
|
|
}
|
|
if (filp->private_data)
|
|
btrfs_ioctl_trans_end(filp);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* fsync call for both files and directories. This logs the inode into
|
|
* the tree log instead of forcing full commits whenever possible.
|
|
*
|
|
* It needs to call filemap_fdatawait so that all ordered extent updates are
|
|
* in the metadata btree are up to date for copying to the log.
|
|
*
|
|
* It drops the inode mutex before doing the tree log commit. This is an
|
|
* important optimization for directories because holding the mutex prevents
|
|
* new operations on the dir while we write to disk.
|
|
*/
|
|
int btrfs_sync_file(struct file *file, struct dentry *dentry, int datasync)
|
|
{
|
|
struct inode *inode = dentry->d_inode;
|
|
struct btrfs_root *root = BTRFS_I(inode)->root;
|
|
int ret = 0;
|
|
struct btrfs_trans_handle *trans;
|
|
|
|
|
|
/* we wait first, since the writeback may change the inode */
|
|
root->log_batch++;
|
|
/* the VFS called filemap_fdatawrite for us */
|
|
btrfs_wait_ordered_range(inode, 0, (u64)-1);
|
|
root->log_batch++;
|
|
|
|
/*
|
|
* check the transaction that last modified this inode
|
|
* and see if its already been committed
|
|
*/
|
|
if (!BTRFS_I(inode)->last_trans)
|
|
goto out;
|
|
|
|
/*
|
|
* if the last transaction that changed this file was before
|
|
* the current transaction, we can bail out now without any
|
|
* syncing
|
|
*/
|
|
mutex_lock(&root->fs_info->trans_mutex);
|
|
if (BTRFS_I(inode)->last_trans <=
|
|
root->fs_info->last_trans_committed) {
|
|
BTRFS_I(inode)->last_trans = 0;
|
|
mutex_unlock(&root->fs_info->trans_mutex);
|
|
goto out;
|
|
}
|
|
mutex_unlock(&root->fs_info->trans_mutex);
|
|
|
|
/*
|
|
* ok we haven't committed the transaction yet, lets do a commit
|
|
*/
|
|
if (file && file->private_data)
|
|
btrfs_ioctl_trans_end(file);
|
|
|
|
trans = btrfs_start_transaction(root, 1);
|
|
if (!trans) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
ret = btrfs_log_dentry_safe(trans, root, dentry);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
/* we've logged all the items and now have a consistent
|
|
* version of the file in the log. It is possible that
|
|
* someone will come in and modify the file, but that's
|
|
* fine because the log is consistent on disk, and we
|
|
* have references to all of the file's extents
|
|
*
|
|
* It is possible that someone will come in and log the
|
|
* file again, but that will end up using the synchronization
|
|
* inside btrfs_sync_log to keep things safe.
|
|
*/
|
|
mutex_unlock(&dentry->d_inode->i_mutex);
|
|
|
|
if (ret != BTRFS_NO_LOG_SYNC) {
|
|
if (ret > 0) {
|
|
ret = btrfs_commit_transaction(trans, root);
|
|
} else {
|
|
ret = btrfs_sync_log(trans, root);
|
|
if (ret == 0)
|
|
ret = btrfs_end_transaction(trans, root);
|
|
else
|
|
ret = btrfs_commit_transaction(trans, root);
|
|
}
|
|
} else {
|
|
ret = btrfs_end_transaction(trans, root);
|
|
}
|
|
mutex_lock(&dentry->d_inode->i_mutex);
|
|
out:
|
|
return ret > 0 ? -EIO : ret;
|
|
}
|
|
|
|
static const struct vm_operations_struct btrfs_file_vm_ops = {
|
|
.fault = filemap_fault,
|
|
.page_mkwrite = btrfs_page_mkwrite,
|
|
};
|
|
|
|
static int btrfs_file_mmap(struct file *filp, struct vm_area_struct *vma)
|
|
{
|
|
vma->vm_ops = &btrfs_file_vm_ops;
|
|
file_accessed(filp);
|
|
return 0;
|
|
}
|
|
|
|
const struct file_operations btrfs_file_operations = {
|
|
.llseek = generic_file_llseek,
|
|
.read = do_sync_read,
|
|
.aio_read = generic_file_aio_read,
|
|
.splice_read = generic_file_splice_read,
|
|
.write = btrfs_file_write,
|
|
.mmap = btrfs_file_mmap,
|
|
.open = generic_file_open,
|
|
.release = btrfs_release_file,
|
|
.fsync = btrfs_sync_file,
|
|
.unlocked_ioctl = btrfs_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = btrfs_ioctl,
|
|
#endif
|
|
};
|