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-rw-r--r--fs/btrfs/file.c62
1 files changed, 43 insertions, 19 deletions
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index b7c885c8423f..399f9d71a926 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -459,13 +459,14 @@ int btrfs_dirty_pages(struct btrfs_root *root, struct inode *inode,
* [start, end]. Existing extents are split as required.
*/
int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
- int skip_pinned)
+ int skip_pinned)
{
struct extent_map *em;
struct extent_map *split = NULL;
struct extent_map *split2 = NULL;
struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
u64 len = end - start + 1;
+ u64 gen;
int ret;
int testend = 1;
unsigned long flags;
@@ -490,6 +491,7 @@ int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
break;
}
flags = em->flags;
+ gen = em->generation;
if (skip_pinned && test_bit(EXTENT_FLAG_PINNED, &em->flags)) {
if (testend && em->start + em->len >= start + len) {
free_extent_map(em);
@@ -518,12 +520,13 @@ int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
split->block_len = em->block_len;
else
split->block_len = split->len;
-
+ split->generation = gen;
split->bdev = em->bdev;
split->flags = flags;
split->compress_type = em->compress_type;
ret = add_extent_mapping(em_tree, split);
BUG_ON(ret); /* Logic error */
+ list_move(&split->list, &em_tree->modified_extents);
free_extent_map(split);
split = split2;
split2 = NULL;
@@ -537,6 +540,7 @@ int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
split->bdev = em->bdev;
split->flags = flags;
split->compress_type = em->compress_type;
+ split->generation = gen;
if (compressed) {
split->block_len = em->block_len;
@@ -550,6 +554,7 @@ int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
ret = add_extent_mapping(em_tree, split);
BUG_ON(ret); /* Logic error */
+ list_move(&split->list, &em_tree->modified_extents);
free_extent_map(split);
split = NULL;
}
@@ -576,13 +581,13 @@ int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
* it is either truncated or split. Anything entirely inside the range
* is deleted from the tree.
*/
-int btrfs_drop_extents(struct btrfs_trans_handle *trans, struct inode *inode,
- u64 start, u64 end, u64 *hint_byte, int drop_cache)
+int __btrfs_drop_extents(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, struct inode *inode,
+ struct btrfs_path *path, u64 start, u64 end,
+ u64 *hint_byte, int drop_cache)
{
- struct btrfs_root *root = BTRFS_I(inode)->root;
struct extent_buffer *leaf;
struct btrfs_file_extent_item *fi;
- struct btrfs_path *path;
struct btrfs_key key;
struct btrfs_key new_key;
u64 ino = btrfs_ino(inode);
@@ -597,14 +602,11 @@ int btrfs_drop_extents(struct btrfs_trans_handle *trans, struct inode *inode,
int recow;
int ret;
int modify_tree = -1;
+ int update_refs = (root->ref_cows || root == root->fs_info->tree_root);
if (drop_cache)
btrfs_drop_extent_cache(inode, start, end - 1, 0);
- path = btrfs_alloc_path();
- if (!path)
- return -ENOMEM;
-
if (start >= BTRFS_I(inode)->disk_i_size)
modify_tree = 0;
@@ -707,7 +709,7 @@ next_slot:
extent_end - start);
btrfs_mark_buffer_dirty(leaf);
- if (disk_bytenr > 0) {
+ if (update_refs && disk_bytenr > 0) {
ret = btrfs_inc_extent_ref(trans, root,
disk_bytenr, num_bytes, 0,
root->root_key.objectid,
@@ -734,7 +736,7 @@ next_slot:
btrfs_set_file_extent_num_bytes(leaf, fi,
extent_end - end);
btrfs_mark_buffer_dirty(leaf);
- if (disk_bytenr > 0) {
+ if (update_refs && disk_bytenr > 0) {
inode_sub_bytes(inode, end - key.offset);
*hint_byte = disk_bytenr;
}
@@ -753,7 +755,7 @@ next_slot:
btrfs_set_file_extent_num_bytes(leaf, fi,
start - key.offset);
btrfs_mark_buffer_dirty(leaf);
- if (disk_bytenr > 0) {
+ if (update_refs && disk_bytenr > 0) {
inode_sub_bytes(inode, extent_end - start);
*hint_byte = disk_bytenr;
}
@@ -777,12 +779,13 @@ next_slot:
del_nr++;
}
- if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
+ if (update_refs &&
+ 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) {
+ } else if (update_refs && disk_bytenr > 0) {
ret = btrfs_free_extent(trans, root,
disk_bytenr, num_bytes, 0,
root->root_key.objectid,
@@ -806,7 +809,7 @@ next_slot:
del_nr);
if (ret) {
btrfs_abort_transaction(trans, root, ret);
- goto out;
+ break;
}
del_nr = 0;
@@ -825,7 +828,22 @@ next_slot:
btrfs_abort_transaction(trans, root, ret);
}
-out:
+ btrfs_release_path(path);
+ return ret;
+}
+
+int btrfs_drop_extents(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, struct inode *inode, u64 start,
+ u64 end, u64 *hint_byte, int drop_cache)
+{
+ struct btrfs_path *path;
+ int ret;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+ ret = __btrfs_drop_extents(trans, root, inode, path, start, end,
+ hint_byte, drop_cache);
btrfs_free_path(path);
return ret;
}
@@ -892,8 +910,6 @@ int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
int ret;
u64 ino = btrfs_ino(inode);
- btrfs_drop_extent_cache(inode, start, end - 1, 0);
-
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
@@ -1556,6 +1572,14 @@ int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
BTRFS_I(inode)->last_trans <=
root->fs_info->last_trans_committed) {
BTRFS_I(inode)->last_trans = 0;
+
+ /*
+ * We'v had everything committed since the last time we were
+ * modified so clear this flag in case it was set for whatever
+ * reason, it's no longer relevant.
+ */
+ clear_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
+ &BTRFS_I(inode)->runtime_flags);
mutex_unlock(&inode->i_mutex);
goto out;
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-24 15:07:12 +0100