Btrfs: Back port to 2.6.18-el kernels (6da6abae) · Commits · github.com / kvm-riscv / linux

fs/btrfs/ctree.h

+13 −0

Original line number	Diff line number	Diff line
		@@ -19,6 +19,7 @@
		#ifndef __BTRFS__
		#define __BTRFS__

		#include <linux/version.h>
		#include <linux/mm.h>
		#include <linux/highmem.h>
		#include <linux/fs.h>
		@@ -334,7 +335,11 @@ struct btrfs_fs_info {
		struct list_head trans_list;
		struct list_head hashers;
		struct list_head dead_roots;
		#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
		struct work_struct trans_work;
		#else
		struct delayed_work trans_work;
		#endif
		struct kobject super_kobj;
		struct completion kobj_unregister;
		int do_barriers;
		@@ -916,6 +921,14 @@ static inline u32 btrfs_level_size(struct btrfs_root *root, int level) {
		((unsigned long)(btrfs_leaf_data(leaf) + \
		btrfs_item_offset_nr(leaf, slot)))

		static inline struct dentry fdentry(struct file file) {
		#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
		return file->f_dentry;
		#else
		return file->f_path.dentry;
		#endif
		}

		/* extent-tree.c */
		u32 btrfs_count_snapshots_in_path(struct btrfs_root *root,
		struct btrfs_path *count_path,

fs/btrfs/disk-io.c

+4 −1

Original line number	Diff line number	Diff line
		@@ -593,8 +593,11 @@ struct btrfs_root open_ctree(struct super_block sb)
		fs_info->do_barriers = 1;
		fs_info->closing = 0;
		fs_info->total_pinned = 0;

		#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
		INIT_WORK(&fs_info->trans_work, btrfs_transaction_cleaner, fs_info);
		#else
		INIT_DELAYED_WORK(&fs_info->trans_work, btrfs_transaction_cleaner);
		#endif
		BTRFS_I(fs_info->btree_inode)->root = tree_root;
		memset(&BTRFS_I(fs_info->btree_inode)->location, 0,
		sizeof(struct btrfs_key));

fs/btrfs/extent_map.c

+160 −8

Original line number	Diff line number	Diff line
		@@ -1585,8 +1585,18 @@ extent_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,

		static int submit_one_bio(int rw, struct bio *bio)
		{
		u64 maxsector;
		int ret = 0;

		bio_get(bio);

		maxsector = bio->bi_bdev->bd_inode->i_size >> 9;
		if (maxsector < bio->bi_sector) {
		printk("sector too large max %Lu got %llu\n", maxsector,
		(unsigned long long)bio->bi_sector);
		WARN_ON(1);
		}

		submit_bio(rw, bio);
		if (bio_flagged(bio, BIO_EOPNOTSUPP))
		ret = -EOPNOTSUPP;
		@@ -1678,8 +1688,12 @@ static int __extent_read_full_page(struct extent_map_tree *tree,

		while (cur <= end) {
		if (cur >= last_byte) {
		char *userpage;
		iosize = PAGE_CACHE_SIZE - page_offset;
		zero_user_page(page, page_offset, iosize, KM_USER0);
		userpage = kmap_atomic(page, KM_USER0);
		memset(userpage + page_offset, 0, iosize);
		flush_dcache_page(page);
		kunmap_atomic(userpage, KM_USER0);
		set_extent_uptodate(tree, cur, cur + iosize - 1,
		GFP_NOFS);
		unlock_extent(tree, cur, cur + iosize - 1, GFP_NOFS);
		@@ -1707,7 +1721,12 @@ static int __extent_read_full_page(struct extent_map_tree *tree,

		/* we've found a hole, just zero and go on */
		if (block_start == EXTENT_MAP_HOLE) {
		zero_user_page(page, page_offset, iosize, KM_USER0);
		char *userpage;
		userpage = kmap_atomic(page, KM_USER0);
		memset(userpage + page_offset, 0, iosize);
		flush_dcache_page(page);
		kunmap_atomic(userpage, KM_USER0);

		set_extent_uptodate(tree, cur, cur + iosize - 1,
		GFP_NOFS);
		unlock_extent(tree, cur, cur + iosize - 1, GFP_NOFS);
		@@ -1804,9 +1823,14 @@ static int __extent_writepage(struct page page, struct writeback_control wbc,
		}

		if (page->index == end_index) {
		char *userpage;

		size_t offset = i_size & (PAGE_CACHE_SIZE - 1);
		zero_user_page(page, offset,
		PAGE_CACHE_SIZE - offset, KM_USER0);

		userpage = kmap_atomic(page, KM_USER0);
		memset(userpage + offset, 0, PAGE_CACHE_SIZE - offset);
		flush_dcache_page(page);
		kunmap_atomic(userpage, KM_USER0);
		}

		set_page_extent_mapped(page);
		@@ -1921,6 +1945,129 @@ static int __extent_writepage(struct page page, struct writeback_control wbc,
		return 0;
		}

		#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)

		/* Taken directly from 2.6.23 for 2.6.18 back port */
		typedef int (writepage_t)(struct page page, struct writeback_control *wbc,
		void *data);

		/**
		* write_cache_pages - walk the list of dirty pages of the given address space
		* and write all of them.
		* @mapping: address space structure to write
		* @wbc: subtract the number of written pages from *@wbc->nr_to_write
		* @writepage: function called for each page
		* @data: data passed to writepage function
		*
		* If a page is already under I/O, write_cache_pages() skips it, even
		* if it's dirty. This is desirable behaviour for memory-cleaning writeback,
		* but it is INCORRECT for data-integrity system calls such as fsync(). fsync()
		* and msync() need to guarantee that all the data which was dirty at the time
		* the call was made get new I/O started against them. If wbc->sync_mode is
		* WB_SYNC_ALL then we were called for data integrity and we must wait for
		* existing IO to complete.
		*/
		static int write_cache_pages(struct address_space *mapping,
		struct writeback_control *wbc, writepage_t writepage,
		void *data)
		{
		struct backing_dev_info *bdi = mapping->backing_dev_info;
		int ret = 0;
		int done = 0;
		struct pagevec pvec;
		int nr_pages;
		pgoff_t index;
		pgoff_t end; /* Inclusive */
		int scanned = 0;
		int range_whole = 0;

		if (wbc->nonblocking && bdi_write_congested(bdi)) {
		wbc->encountered_congestion = 1;
		return 0;
		}

		pagevec_init(&pvec, 0);
		if (wbc->range_cyclic) {
		index = mapping->writeback_index; /* Start from prev offset */
		end = -1;
		} else {
		index = wbc->range_start >> PAGE_CACHE_SHIFT;
		end = wbc->range_end >> PAGE_CACHE_SHIFT;
		if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
		range_whole = 1;
		scanned = 1;
		}
		retry:
		while (!done && (index <= end) &&
		(nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
		PAGECACHE_TAG_DIRTY,
		min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) {
		unsigned i;

		scanned = 1;
		for (i = 0; i < nr_pages; i++) {
		struct page *page = pvec.pages[i];

		/*
		* At this point we hold neither mapping->tree_lock nor
		* lock on the page itself: the page may be truncated or
		* invalidated (changing page->mapping to NULL), or even
		* swizzled back from swapper_space to tmpfs file
		* mapping
		*/
		lock_page(page);

		if (unlikely(page->mapping != mapping)) {
		unlock_page(page);
		continue;
		}

		if (!wbc->range_cyclic && page->index > end) {
		done = 1;
		unlock_page(page);
		continue;
		}

		if (wbc->sync_mode != WB_SYNC_NONE)
		wait_on_page_writeback(page);

		if (PageWriteback(page) \|\|
		!clear_page_dirty_for_io(page)) {
		unlock_page(page);
		continue;
		}

		ret = (*writepage)(page, wbc, data);

		if (unlikely(ret == AOP_WRITEPAGE_ACTIVATE)) {
		unlock_page(page);
		ret = 0;
		}
		if (ret \|\| (--(wbc->nr_to_write) <= 0))
		done = 1;
		if (wbc->nonblocking && bdi_write_congested(bdi)) {
		wbc->encountered_congestion = 1;
		done = 1;
		}
		}
		pagevec_release(&pvec);
		cond_resched();
		}
		if (!scanned && !done) {
		/*
		* We hit the last page and there is more work to be done: wrap
		* back to the start of the file
		*/
		scanned = 1;
		index = 0;
		goto retry;
		}
		if (wbc->range_cyclic \|\| (range_whole && wbc->nr_to_write > 0))
		mapping->writeback_index = index;
		return ret;
		}
		#endif

		int extent_write_full_page(struct extent_map_tree tree, struct page page,
		get_extent_t *get_extent,
		struct writeback_control *wbc)
		@@ -1945,18 +2092,20 @@ int extent_write_full_page(struct extent_map_tree tree, struct page page,
		ret = __extent_writepage(page, wbc, &epd);

		write_cache_pages(mapping, &wbc_writepages, __extent_writepage, &epd);
		if (epd.bio)
		if (epd.bio) {
		submit_one_bio(WRITE, epd.bio);
		}
		return ret;
		}
		EXPORT_SYMBOL(extent_write_full_page);


		int extent_writepages(struct extent_map_tree *tree,
		struct address_space *mapping,
		get_extent_t *get_extent,
		struct writeback_control *wbc)
		{
		int ret;
		int ret = 0;
		struct extent_page_data epd = {
		.bio = NULL,
		.tree = tree,
		@@ -1964,8 +2113,9 @@ int extent_writepages(struct extent_map_tree *tree,
		};

		ret = write_cache_pages(mapping, wbc, __extent_writepage, &epd);
		if (epd.bio)
		if (epd.bio) {
		submit_one_bio(WRITE, epd.bio);
		}
		return ret;
		}
		EXPORT_SYMBOL(extent_writepages);
		@@ -2106,7 +2256,9 @@ int extent_prepare_write(struct extent_map_tree *tree,
		flush_dcache_page(page);
		kunmap_atomic(kaddr, KM_USER0);
		}
		if (!isnew && !PageUptodate(page) &&
		if ((em->block_start != EXTENT_MAP_HOLE &&
		em->block_start != EXTENT_MAP_INLINE) &&
		!isnew && !PageUptodate(page) &&
		(block_off_end > to \|\| block_off_start < from) &&
		!test_range_bit(tree, block_start, cur_end,
		EXTENT_UPTODATE, 1)) {

fs/btrfs/file.c

+11 −4

Original line number	Diff line number	Diff line
		@@ -231,7 +231,7 @@ static int dirty_and_release_pages(struct btrfs_trans_handle *trans,
		{
		int err = 0;
		int i;
		struct inode *inode = file->f_path.dentry->d_inode;
		struct inode *inode = fdentry(file)->d_inode;
		struct extent_map *em;
		struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
		u64 hint_byte;
		@@ -652,7 +652,7 @@ static int prepare_pages(struct btrfs_root *root,
		{
		int i;
		unsigned long index = pos >> PAGE_CACHE_SHIFT;
		struct inode *inode = file->f_path.dentry->d_inode;
		struct inode *inode = fdentry(file)->d_inode;
		int err = 0;
		u64 start_pos;

		@@ -666,7 +666,11 @@ static int prepare_pages(struct btrfs_root *root,
		err = -ENOMEM;
		BUG_ON(1);
		}
		#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
		ClearPageDirty(pages[i]);
		#else
		cancel_dirty_page(pages[i], PAGE_CACHE_SIZE);
		#endif
		wait_on_page_writeback(pages[i]);
		set_page_extent_mapped(pages[i]);
		WARN_ON(!PageLocked(pages[i]));
		@@ -682,7 +686,7 @@ static ssize_t btrfs_file_write(struct file file, const char __user buf,
		ssize_t num_written = 0;
		ssize_t err = 0;
		int ret = 0;
		struct inode *inode = file->f_path.dentry->d_inode;
		struct inode *inode = fdentry(file)->d_inode;
		struct btrfs_root *root = BTRFS_I(inode)->root;
		struct page **pages = NULL;
		int nrptrs;
		@@ -707,7 +711,7 @@ static ssize_t btrfs_file_write(struct file file, const char __user buf,
		goto out;
		if (count == 0)
		goto out;
		err = remove_suid(file->f_path.dentry);
		err = remove_suid(fdentry(file));
		if (err)
		goto out;
		file_update_time(file);
		@@ -862,6 +866,9 @@ struct file_operations btrfs_file_operations = {
		.read = do_sync_read,
		.aio_read = generic_file_aio_read,
		.splice_read = generic_file_splice_read,
		#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
		.sendfile = generic_file_sendfile,
		#endif
		.write = btrfs_file_write,
		.mmap = btrfs_file_mmap,
		.open = generic_file_open,

fs/btrfs/inode.c

+16 −5

Original line number	Diff line number	Diff line
		@@ -532,7 +532,11 @@ static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
		dir->i_size -= name_len * 2;
		dir->i_mtime = dir->i_ctime = CURRENT_TIME;
		btrfs_update_inode(trans, root, dir);
		#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
		dentry->d_inode->i_nlink--;
		#else
		drop_nlink(dentry->d_inode);
		#endif
		ret = btrfs_update_inode(trans, root, dentry->d_inode);
		dir->i_sb->s_dirt = 1;
		}
		@@ -1139,7 +1143,7 @@ static unsigned char btrfs_filetype_table[] = {

		static int btrfs_readdir(struct file filp, void dirent, filldir_t filldir)
		{
		struct inode *inode = filp->f_path.dentry->d_inode;
		struct inode *inode = filp->f_dentry->d_inode;
		struct btrfs_root *root = BTRFS_I(inode)->root;
		struct btrfs_item *item;
		struct btrfs_dir_item *di;
		@@ -1554,7 +1558,11 @@ static int btrfs_link(struct dentry old_dentry, struct inode dir,
		if (inode->i_nlink == 0)
		return -ENOENT;

		#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
		inode->i_nlink++;
		#else
		inc_nlink(inode);
		#endif
		mutex_lock(&root->fs_info->fs_mutex);
		trans = btrfs_start_transaction(root, 1);

		@@ -1825,6 +1833,9 @@ struct extent_map btrfs_get_extent(struct inode inode, struct page *page,
		if (ret == -EEXIST) {
		free_extent_map(em);
		em = NULL;
		if (0 && failed_insert == 1) {
		btrfs_drop_extent_cache(inode, start, end);
		}
		failed_insert++;
		if (failed_insert > 5) {
		printk("failing to insert %Lu %Lu\n", start, end);
		@@ -1942,7 +1953,7 @@ static void btrfs_invalidatepage(struct page *page, unsigned long offset)
		*/
		int btrfs_page_mkwrite(struct vm_area_struct vma, struct page page)
		{
		struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
		struct inode *inode = fdentry(vma->vm_file)->d_inode;
		unsigned long end;
		loff_t size;
		int ret = -EINVAL;
		@@ -2243,7 +2254,7 @@ static unsigned long force_ra(struct address_space *mapping,
		}

		int btrfs_defrag_file(struct file *file) {
		struct inode *inode = file->f_path.dentry->d_inode;
		struct inode *inode = fdentry(file)->d_inode;
		struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
		struct page *page;
		unsigned long last_index;
		@@ -2329,7 +2340,7 @@ static int btrfs_ioctl_snap_create(struct btrfs_root root, void __user arg)

		static int btrfs_ioctl_defrag(struct file *file)
		{
		struct inode *inode = file->f_path.dentry->d_inode;
		struct inode *inode = fdentry(file)->d_inode;
		struct btrfs_root *root = BTRFS_I(inode)->root;

		switch (inode->i_mode & S_IFMT) {
		@@ -2350,7 +2361,7 @@ static int btrfs_ioctl_defrag(struct file *file)
		long btrfs_ioctl(struct file *file, unsigned int
		cmd, unsigned long arg)
		{
		struct btrfs_root *root = BTRFS_I(file->f_path.dentry->d_inode)->root;
		struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;

		switch (cmd) {
		case BTRFS_IOC_SNAP_CREATE: