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-rw-r--r--fs/btrfs/inode.c60
-rw-r--r--fs/btrfs/ordered-data.c13
-rw-r--r--fs/btrfs/ordered-data.h7
3 files changed, 62 insertions, 18 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 4d4e2de3e879..f0e41b840739 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -2562,8 +2562,10 @@ static int btrfs_finish_ordered_io(struct btrfs_ordered_extent *ordered_extent)
struct extent_state *cached_state = NULL;
struct new_sa_defrag_extent *new = NULL;
int compress_type = 0;
- int ret;
+ int ret = 0;
+ u64 logical_len = ordered_extent->len;
bool nolock;
+ bool truncated = false;
nolock = btrfs_is_free_space_inode(inode);
@@ -2572,6 +2574,14 @@ static int btrfs_finish_ordered_io(struct btrfs_ordered_extent *ordered_extent)
goto out;
}
+ if (test_bit(BTRFS_ORDERED_TRUNCATED, &ordered_extent->flags)) {
+ truncated = true;
+ logical_len = ordered_extent->truncated_len;
+ /* Truncated the entire extent, don't bother adding */
+ if (!logical_len)
+ goto out;
+ }
+
if (test_bit(BTRFS_ORDERED_NOCOW, &ordered_extent->flags)) {
BUG_ON(!list_empty(&ordered_extent->list)); /* Logic error */
btrfs_ordered_update_i_size(inode, 0, ordered_extent);
@@ -2627,15 +2637,14 @@ static int btrfs_finish_ordered_io(struct btrfs_ordered_extent *ordered_extent)
ret = btrfs_mark_extent_written(trans, inode,
ordered_extent->file_offset,
ordered_extent->file_offset +
- ordered_extent->len);
+ logical_len);
} else {
BUG_ON(root == root->fs_info->tree_root);
ret = insert_reserved_file_extent(trans, inode,
ordered_extent->file_offset,
ordered_extent->start,
ordered_extent->disk_len,
- ordered_extent->len,
- ordered_extent->len,
+ logical_len, logical_len,
compress_type, 0, 0,
BTRFS_FILE_EXTENT_REG);
}
@@ -2667,17 +2676,27 @@ out:
if (trans)
btrfs_end_transaction(trans, root);
- if (ret) {
- clear_extent_uptodate(io_tree, ordered_extent->file_offset,
- ordered_extent->file_offset +
- ordered_extent->len - 1, NULL, GFP_NOFS);
+ if (ret || truncated) {
+ u64 start, end;
+
+ if (truncated)
+ start = ordered_extent->file_offset + logical_len;
+ else
+ start = ordered_extent->file_offset;
+ end = ordered_extent->file_offset + ordered_extent->len - 1;
+ clear_extent_uptodate(io_tree, start, end, NULL, GFP_NOFS);
+
+ /* Drop the cache for the part of the extent we didn't write. */
+ btrfs_drop_extent_cache(inode, start, end, 0);
/*
* If the ordered extent had an IOERR or something else went
* wrong we need to return the space for this ordered extent
- * back to the allocator.
+ * back to the allocator. We only free the extent in the
+ * truncated case if we didn't write out the extent at all.
*/
- if (!test_bit(BTRFS_ORDERED_NOCOW, &ordered_extent->flags) &&
+ if ((ret || !logical_len) &&
+ !test_bit(BTRFS_ORDERED_NOCOW, &ordered_extent->flags) &&
!test_bit(BTRFS_ORDERED_PREALLOC, &ordered_extent->flags))
btrfs_free_reserved_extent(root, ordered_extent->start,
ordered_extent->disk_len);
@@ -7336,10 +7355,23 @@ static void btrfs_invalidatepage(struct page *page, unsigned int offset,
* whoever cleared the private bit is responsible
* for the finish_ordered_io
*/
- if (TestClearPagePrivate2(page) &&
- btrfs_dec_test_ordered_pending(inode, &ordered, page_start,
- PAGE_CACHE_SIZE, 1)) {
- btrfs_finish_ordered_io(ordered);
+ if (TestClearPagePrivate2(page)) {
+ struct btrfs_ordered_inode_tree *tree;
+ u64 new_len;
+
+ tree = &BTRFS_I(inode)->ordered_tree;
+
+ spin_lock_irq(&tree->lock);
+ set_bit(BTRFS_ORDERED_TRUNCATED, &ordered->flags);
+ new_len = page_start - ordered->file_offset;
+ if (new_len < ordered->truncated_len)
+ ordered->truncated_len = new_len;
+ spin_unlock_irq(&tree->lock);
+
+ if (btrfs_dec_test_ordered_pending(inode, &ordered,
+ page_start,
+ PAGE_CACHE_SIZE, 1))
+ btrfs_finish_ordered_io(ordered);
}
btrfs_put_ordered_extent(ordered);
cached_state = NULL;
diff --git a/fs/btrfs/ordered-data.c b/fs/btrfs/ordered-data.c
index f2023ccb7cf6..966b413a33b8 100644
--- a/fs/btrfs/ordered-data.c
+++ b/fs/btrfs/ordered-data.c
@@ -205,6 +205,7 @@ static int __btrfs_add_ordered_extent(struct inode *inode, u64 file_offset,
entry->bytes_left = len;
entry->inode = igrab(inode);
entry->compress_type = compress_type;
+ entry->truncated_len = (u64)-1;
if (type != BTRFS_ORDERED_IO_DONE && type != BTRFS_ORDERED_COMPLETE)
set_bit(type, &entry->flags);
@@ -920,12 +921,16 @@ int btrfs_ordered_update_i_size(struct inode *inode, u64 offset,
struct btrfs_ordered_extent *test;
int ret = 1;
- if (ordered)
+ spin_lock_irq(&tree->lock);
+ if (ordered) {
offset = entry_end(ordered);
- else
+ if (test_bit(BTRFS_ORDERED_TRUNCATED, &ordered->flags))
+ offset = min(offset,
+ ordered->file_offset +
+ ordered->truncated_len);
+ } else {
offset = ALIGN(offset, BTRFS_I(inode)->root->sectorsize);
-
- spin_lock_irq(&tree->lock);
+ }
disk_i_size = BTRFS_I(inode)->disk_i_size;
/* truncate file */
diff --git a/fs/btrfs/ordered-data.h b/fs/btrfs/ordered-data.h
index 68844d59ee6f..d9a5aa097b4f 100644
--- a/fs/btrfs/ordered-data.h
+++ b/fs/btrfs/ordered-data.h
@@ -69,6 +69,7 @@ struct btrfs_ordered_sum {
* the isize. */
#define BTRFS_ORDERED_LOGGED_CSUM 8 /* We've logged the csums on this ordered
ordered extent */
+#define BTRFS_ORDERED_TRUNCATED 9 /* Set when we have to truncate an extent */
struct btrfs_ordered_extent {
/* logical offset in the file */
@@ -96,6 +97,12 @@ struct btrfs_ordered_extent {
*/
u64 outstanding_isize;
+ /*
+ * If we get truncated we need to adjust the file extent we enter for
+ * this ordered extent so that we do not expose stale data.
+ */
+ u64 truncated_len;
+
/* flags (described above) */
unsigned long flags;
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-19 13:02:58 +0000