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Merge branch 'for-linus-4.5' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs 

Pull btrfs fixes from Chris Mason:
 "This has a few fixes from Filipe, along with a readdir fix from Dave
  that we've been testing for some time"

* 'for-linus-4.5' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
  btrfs: properly set the termination value of ctx->pos in readdir
  Btrfs: fix hang on extent buffer lock caused by the inode_paths ioctl
  Btrfs: remove no longer used function extent_read_full_page_nolock()
  Btrfs: fix page reading in extent_same ioctl leading to csum errors
  Btrfs: fix invalid page accesses in extent_same (dedup) ioctl
This commit is contained in:
Linus Torvalds 2016-02-12 09:21:28 -08:00
parent dfc852864d bc4ef7592f
commit 27c9d772e5
8 changed files with 131 additions and 71 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
fs/btrfs/backref.c
View File

@ -1406,7 +1406,8 @@ char *btrfs_ref_to_path(struct btrfs_root *fs_root, struct btrfs_path *path,
read_extent_buffer(eb, dest + bytes_left,
name_off, name_len);
if (eb != eb_in) {
btrfs_tree_read_unlock_blocking(eb);
if (!path->skip_locking)
btrfs_tree_read_unlock_blocking(eb);
free_extent_buffer(eb);
}
ret = btrfs_find_item(fs_root, path, parent, 0,
@ -1426,9 +1427,10 @@ char *btrfs_ref_to_path(struct btrfs_root *fs_root, struct btrfs_path *path,
eb = path->nodes[0];
/* make sure we can use eb after releasing the path */
if (eb != eb_in) {
atomic_inc(&eb->refs);
btrfs_tree_read_lock(eb);
btrfs_set_lock_blocking_rw(eb, BTRFS_READ_LOCK);
if (!path->skip_locking)
btrfs_set_lock_blocking_rw(eb, BTRFS_READ_LOCK);
path->nodes[0] = NULL;
path->locks[0] = 0;
}
btrfs_release_path(path);
iref = btrfs_item_ptr(eb, slot, struct btrfs_inode_ref);

6
fs/btrfs/compression.c
View File

@ -637,11 +637,7 @@ int btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
faili = nr_pages - 1;
cb->nr_pages = nr_pages;
/* In the parent-locked case, we only locked the range we are
* interested in. In all other cases, we can opportunistically
* cache decompressed data that goes beyond the requested range. */
if (!(bio_flags & EXTENT_BIO_PARENT_LOCKED))
add_ra_bio_pages(inode, em_start + em_len, cb);
add_ra_bio_pages(inode, em_start + em_len, cb);
/* include any pages we added in add_ra-bio_pages */
uncompressed_len = bio->bi_vcnt * PAGE_CACHE_SIZE;

3
fs/btrfs/delayed-inode.c
View File

@ -1689,7 +1689,7 @@ int btrfs_should_delete_dir_index(struct list_head *del_list,
*
*/
int btrfs_readdir_delayed_dir_index(struct dir_context *ctx,
struct list_head *ins_list)
struct list_head *ins_list, bool *emitted)
{
struct btrfs_dir_item *di;
struct btrfs_delayed_item *curr, *next;
@ -1733,6 +1733,7 @@ int btrfs_readdir_delayed_dir_index(struct dir_context *ctx,
if (over)
return 1;
*emitted = true;
}
return 0;
}

2
fs/btrfs/delayed-inode.h
View File

@ -144,7 +144,7 @@ void btrfs_put_delayed_items(struct list_head *ins_list,
int btrfs_should_delete_dir_index(struct list_head *del_list,
u64 index);
int btrfs_readdir_delayed_dir_index(struct dir_context *ctx,
struct list_head *ins_list);
struct list_head *ins_list, bool *emitted);
/* for init */
int __init btrfs_delayed_inode_init(void);

45
fs/btrfs/extent_io.c
View File

@ -2897,12 +2897,11 @@ static int __do_readpage(struct extent_io_tree *tree,
struct block_device *bdev;
int ret;
int nr = 0;
int parent_locked = *bio_flags & EXTENT_BIO_PARENT_LOCKED;
size_t pg_offset = 0;
size_t iosize;
size_t disk_io_size;
size_t blocksize = inode->i_sb->s_blocksize;
unsigned long this_bio_flag = *bio_flags & EXTENT_BIO_PARENT_LOCKED;
unsigned long this_bio_flag = 0;
set_page_extent_mapped(page);
@ -2942,18 +2941,16 @@ static int __do_readpage(struct extent_io_tree *tree,
kunmap_atomic(userpage);
set_extent_uptodate(tree, cur, cur + iosize - 1,
&cached, GFP_NOFS);
if (!parent_locked)
unlock_extent_cached(tree, cur,
cur + iosize - 1,
&cached, GFP_NOFS);
unlock_extent_cached(tree, cur,
cur + iosize - 1,
&cached, GFP_NOFS);
break;
}
em = __get_extent_map(inode, page, pg_offset, cur,
end - cur + 1, get_extent, em_cached);
if (IS_ERR_OR_NULL(em)) {
SetPageError(page);
if (!parent_locked)
unlock_extent(tree, cur, end);
unlock_extent(tree, cur, end);
break;
}
extent_offset = cur - em->start;
@ -3038,12 +3035,9 @@ static int __do_readpage(struct extent_io_tree *tree,
set_extent_uptodate(tree, cur, cur + iosize - 1,
&cached, GFP_NOFS);
if (parent_locked)
free_extent_state(cached);
else
unlock_extent_cached(tree, cur,
cur + iosize - 1,
&cached, GFP_NOFS);
unlock_extent_cached(tree, cur,
cur + iosize - 1,
&cached, GFP_NOFS);
cur = cur + iosize;
pg_offset += iosize;
continue;
@ -3052,8 +3046,7 @@ static int __do_readpage(struct extent_io_tree *tree,
if (test_range_bit(tree, cur, cur_end,
EXTENT_UPTODATE, 1, NULL)) {
check_page_uptodate(tree, page);
if (!parent_locked)
unlock_extent(tree, cur, cur + iosize - 1);
unlock_extent(tree, cur, cur + iosize - 1);
cur = cur + iosize;
pg_offset += iosize;
continue;
@ -3063,8 +3056,7 @@ static int __do_readpage(struct extent_io_tree *tree,
*/
if (block_start == EXTENT_MAP_INLINE) {
SetPageError(page);
if (!parent_locked)
unlock_extent(tree, cur, cur + iosize - 1);
unlock_extent(tree, cur, cur + iosize - 1);
cur = cur + iosize;
pg_offset += iosize;
continue;
@ -3083,8 +3075,7 @@ static int __do_readpage(struct extent_io_tree *tree,
*bio_flags = this_bio_flag;
} else {
SetPageError(page);
if (!parent_locked)
unlock_extent(tree, cur, cur + iosize - 1);
unlock_extent(tree, cur, cur + iosize - 1);
}
cur = cur + iosize;
pg_offset += iosize;
@ -3213,20 +3204,6 @@ int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
return ret;
}
int extent_read_full_page_nolock(struct extent_io_tree *tree, struct page *page,
get_extent_t *get_extent, int mirror_num)
{
struct bio *bio = NULL;
unsigned long bio_flags = EXTENT_BIO_PARENT_LOCKED;
int ret;
ret = __do_readpage(tree, page, get_extent, NULL, &bio, mirror_num,
&bio_flags, READ, NULL);
if (bio)
ret = submit_one_bio(READ, bio, mirror_num, bio_flags);
return ret;
}
static noinline void update_nr_written(struct page *page,
struct writeback_control *wbc,
unsigned long nr_written)

3
fs/btrfs/extent_io.h
View File

@ -29,7 +29,6 @@
*/
#define EXTENT_BIO_COMPRESSED 1
#define EXTENT_BIO_TREE_LOG 2
#define EXTENT_BIO_PARENT_LOCKED 4
#define EXTENT_BIO_FLAG_SHIFT 16
/* these are bit numbers for test/set bit */
@ -210,8 +209,6 @@ static inline int lock_extent(struct extent_io_tree *tree, u64 start, u64 end)
int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
get_extent_t *get_extent, int mirror_num);
int extent_read_full_page_nolock(struct extent_io_tree *tree, struct page *page,
get_extent_t *get_extent, int mirror_num);
int __init extent_io_init(void);
void extent_io_exit(void);

14
fs/btrfs/inode.c
View File

@ -5717,6 +5717,7 @@ static int btrfs_real_readdir(struct file *file, struct dir_context *ctx)
char *name_ptr;
int name_len;
int is_curr = 0; /* ctx->pos points to the current index? */
bool emitted;
/* FIXME, use a real flag for deciding about the key type */
if (root->fs_info->tree_root == root)
@ -5745,6 +5746,7 @@ static int btrfs_real_readdir(struct file *file, struct dir_context *ctx)
if (ret < 0)
goto err;
emitted = false;
while (1) {
leaf = path->nodes[0];
slot = path->slots[0];
@ -5824,6 +5826,7 @@ skip:
if (over)
goto nopos;
emitted = true;
di_len = btrfs_dir_name_len(leaf, di) +
btrfs_dir_data_len(leaf, di) + sizeof(*di);
di_cur += di_len;
@ -5836,11 +5839,20 @@ next:
if (key_type == BTRFS_DIR_INDEX_KEY) {
if (is_curr)
ctx->pos++;
ret = btrfs_readdir_delayed_dir_index(ctx, &ins_list);
ret = btrfs_readdir_delayed_dir_index(ctx, &ins_list, &emitted);
if (ret)
goto nopos;
}
/*
* If we haven't emitted any dir entry, we must not touch ctx->pos as
* it was was set to the termination value in previous call. We assume
* that "." and ".." were emitted if we reach this point and set the
* termination value as well for an empty directory.
*/
if (ctx->pos > 2 && !emitted)
goto nopos;
/* Reached end of directory/root. Bump pos past the last item. */
ctx->pos++;

119
fs/btrfs/ioctl.c
View File

@ -2794,24 +2794,29 @@ out:
static struct page *extent_same_get_page(struct inode *inode, pgoff_t index)
{
struct page *page;
struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree;
page = grab_cache_page(inode->i_mapping, index);
if (!page)
return NULL;
return ERR_PTR(-ENOMEM);
if (!PageUptodate(page)) {
if (extent_read_full_page_nolock(tree, page, btrfs_get_extent,
0))
return NULL;
int ret;
ret = btrfs_readpage(NULL, page);
if (ret)
return ERR_PTR(ret);
lock_page(page);
if (!PageUptodate(page)) {
unlock_page(page);
page_cache_release(page);
return NULL;
return ERR_PTR(-EIO);
}
if (page->mapping != inode->i_mapping) {
unlock_page(page);
page_cache_release(page);
return ERR_PTR(-EAGAIN);
}
}
unlock_page(page);
return page;
}
@ -2823,17 +2828,31 @@ static int gather_extent_pages(struct inode *inode, struct page **pages,
pgoff_t index = off >> PAGE_CACHE_SHIFT;
for (i = 0; i < num_pages; i++) {
again:
pages[i] = extent_same_get_page(inode, index + i);
if (!pages[i])
return -ENOMEM;
if (IS_ERR(pages[i])) {
int err = PTR_ERR(pages[i]);
if (err == -EAGAIN)
goto again;
pages[i] = NULL;
return err;
}
}
return 0;
}
static inline void lock_extent_range(struct inode *inode, u64 off, u64 len)
static int lock_extent_range(struct inode *inode, u64 off, u64 len,
bool retry_range_locking)
{
/* do any pending delalloc/csum calc on src, one way or
another, and lock file content */
/*
* Do any pending delalloc/csum calculations on inode, one way or
* another, and lock file content.
* The locking order is:
*
* 1) pages
* 2) range in the inode's io tree
*/
while (1) {
struct btrfs_ordered_extent *ordered;
lock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1);
@ -2851,8 +2870,11 @@ static inline void lock_extent_range(struct inode *inode, u64 off, u64 len)
unlock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1);
if (ordered)
btrfs_put_ordered_extent(ordered);
if (!retry_range_locking)
return -EAGAIN;
btrfs_wait_ordered_range(inode, off, len);
}
return 0;
}
static void btrfs_double_inode_unlock(struct inode *inode1, struct inode *inode2)
@ -2877,15 +2899,24 @@ static void btrfs_double_extent_unlock(struct inode *inode1, u64 loff1,
unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1);
}
static void btrfs_double_extent_lock(struct inode *inode1, u64 loff1,
struct inode *inode2, u64 loff2, u64 len)
static int btrfs_double_extent_lock(struct inode *inode1, u64 loff1,
struct inode *inode2, u64 loff2, u64 len,
bool retry_range_locking)
{
int ret;
if (inode1 < inode2) {
swap(inode1, inode2);
swap(loff1, loff2);
}
lock_extent_range(inode1, loff1, len);
lock_extent_range(inode2, loff2, len);
ret = lock_extent_range(inode1, loff1, len, retry_range_locking);
if (ret)
return ret;
ret = lock_extent_range(inode2, loff2, len, retry_range_locking);
if (ret)
unlock_extent(&BTRFS_I(inode1)->io_tree, loff1,
loff1 + len - 1);
return ret;
}
struct cmp_pages {
@ -2901,11 +2932,15 @@ static void btrfs_cmp_data_free(struct cmp_pages *cmp)
for (i = 0; i < cmp->num_pages; i++) {
pg = cmp->src_pages[i];
if (pg)
if (pg) {
unlock_page(pg);
page_cache_release(pg);
}
pg = cmp->dst_pages[i];
if (pg)
if (pg) {
unlock_page(pg);
page_cache_release(pg);
}
}
kfree(cmp->src_pages);
kfree(cmp->dst_pages);
@ -2966,6 +3001,8 @@ static int btrfs_cmp_data(struct inode *src, u64 loff, struct inode *dst,
src_page = cmp->src_pages[i];
dst_page = cmp->dst_pages[i];
ASSERT(PageLocked(src_page));
ASSERT(PageLocked(dst_page));
addr = kmap_atomic(src_page);
dst_addr = kmap_atomic(dst_page);
@ -3078,14 +3115,46 @@ static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen,
goto out_unlock;
}
again:
ret = btrfs_cmp_data_prepare(src, loff, dst, dst_loff, olen, &cmp);
if (ret)
goto out_unlock;
if (same_inode)
lock_extent_range(src, same_lock_start, same_lock_len);
ret = lock_extent_range(src, same_lock_start, same_lock_len,
false);
else
btrfs_double_extent_lock(src, loff, dst, dst_loff, len);
ret = btrfs_double_extent_lock(src, loff, dst, dst_loff, len,
false);
/*
* If one of the inodes has dirty pages in the respective range or
* ordered extents, we need to flush dellaloc and wait for all ordered
* extents in the range. We must unlock the pages and the ranges in the
* io trees to avoid deadlocks when flushing delalloc (requires locking
* pages) and when waiting for ordered extents to complete (they require
* range locking).
*/
if (ret == -EAGAIN) {
/*
* Ranges in the io trees already unlocked. Now unlock all
* pages before waiting for all IO to complete.
*/
btrfs_cmp_data_free(&cmp);
if (same_inode) {
btrfs_wait_ordered_range(src, same_lock_start,
same_lock_len);
} else {
btrfs_wait_ordered_range(src, loff, len);
btrfs_wait_ordered_range(dst, dst_loff, len);
}
goto again;
}
ASSERT(ret == 0);
if (WARN_ON(ret)) {
/* ranges in the io trees already unlocked */
btrfs_cmp_data_free(&cmp);
return ret;
}
/* pass original length for comparison so we stay within i_size */
ret = btrfs_cmp_data(src, loff, dst, dst_loff, olen, &cmp);
@ -3795,9 +3864,15 @@ static noinline int btrfs_clone_files(struct file *file, struct file *file_src,
u64 lock_start = min_t(u64, off, destoff);
u64 lock_len = max_t(u64, off, destoff) + len - lock_start;
lock_extent_range(src, lock_start, lock_len);
ret = lock_extent_range(src, lock_start, lock_len, true);
} else {
btrfs_double_extent_lock(src, off, inode, destoff, len);
ret = btrfs_double_extent_lock(src, off, inode, destoff, len,
true);
}
ASSERT(ret == 0);
if (WARN_ON(ret)) {
/* ranges in the io trees already unlocked */
goto out_unlock;
}
ret = btrfs_clone(src, inode, off, olen, len, destoff, 0);