diff options
Diffstat (limited to 'fs/btrfs/ioctl.c')
| -rw-r--r-- | fs/btrfs/ioctl.c | 48 |
1 files changed, 39 insertions, 9 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 90136562d865..218724e4edd6 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -1186,8 +1186,10 @@ struct defrag_target_range { static int defrag_collect_targets(struct btrfs_inode *inode, u64 start, u64 len, u32 extent_thresh, u64 newer_than, bool do_compress, - bool locked, struct list_head *target_list) + bool locked, struct list_head *target_list, + u64 *last_scanned_ret) { + bool last_is_target = false; u64 cur = start; int ret = 0; @@ -1197,6 +1199,7 @@ static int defrag_collect_targets(struct btrfs_inode *inode, bool next_mergeable = true; u64 range_len; + last_is_target = false; em = defrag_lookup_extent(&inode->vfs_inode, cur, locked); if (!em) break; @@ -1272,6 +1275,7 @@ static int defrag_collect_targets(struct btrfs_inode *inode, } add: + last_is_target = true; range_len = min(extent_map_end(em), start + len) - cur; /* * This one is a good target, check if it can be merged into @@ -1315,6 +1319,17 @@ next: kfree(entry); } } + if (!ret && last_scanned_ret) { + /* + * If the last extent is not a target, the caller can skip to + * the end of that extent. + * Otherwise, we can only go the end of the specified range. + */ + if (!last_is_target) + *last_scanned_ret = max(cur, *last_scanned_ret); + else + *last_scanned_ret = max(start + len, *last_scanned_ret); + } return ret; } @@ -1373,7 +1388,8 @@ static int defrag_one_locked_target(struct btrfs_inode *inode, } static int defrag_one_range(struct btrfs_inode *inode, u64 start, u32 len, - u32 extent_thresh, u64 newer_than, bool do_compress) + u32 extent_thresh, u64 newer_than, bool do_compress, + u64 *last_scanned_ret) { struct extent_state *cached_state = NULL; struct defrag_target_range *entry; @@ -1419,7 +1435,7 @@ static int defrag_one_range(struct btrfs_inode *inode, u64 start, u32 len, */ ret = defrag_collect_targets(inode, start, len, extent_thresh, newer_than, do_compress, true, - &target_list); + &target_list, last_scanned_ret); if (ret < 0) goto unlock_extent; @@ -1454,7 +1470,8 @@ static int defrag_one_cluster(struct btrfs_inode *inode, u64 start, u32 len, u32 extent_thresh, u64 newer_than, bool do_compress, unsigned long *sectors_defragged, - unsigned long max_sectors) + unsigned long max_sectors, + u64 *last_scanned_ret) { const u32 sectorsize = inode->root->fs_info->sectorsize; struct defrag_target_range *entry; @@ -1465,7 +1482,7 @@ static int defrag_one_cluster(struct btrfs_inode *inode, BUILD_BUG_ON(!IS_ALIGNED(CLUSTER_SIZE, PAGE_SIZE)); ret = defrag_collect_targets(inode, start, len, extent_thresh, newer_than, do_compress, false, - &target_list); + &target_list, NULL); if (ret < 0) goto out; @@ -1482,6 +1499,15 @@ static int defrag_one_cluster(struct btrfs_inode *inode, range_len = min_t(u32, range_len, (max_sectors - *sectors_defragged) * sectorsize); + /* + * If defrag_one_range() has updated last_scanned_ret, + * our range may already be invalid (e.g. hole punched). + * Skip if our range is before last_scanned_ret, as there is + * no need to defrag the range anymore. + */ + if (entry->start + range_len <= *last_scanned_ret) + continue; + if (ra) page_cache_sync_readahead(inode->vfs_inode.i_mapping, ra, NULL, entry->start >> PAGE_SHIFT, @@ -1494,7 +1520,8 @@ static int defrag_one_cluster(struct btrfs_inode *inode, * accounting. */ ret = defrag_one_range(inode, entry->start, range_len, - extent_thresh, newer_than, do_compress); + extent_thresh, newer_than, do_compress, + last_scanned_ret); if (ret < 0) break; *sectors_defragged += range_len >> @@ -1505,6 +1532,8 @@ out: list_del_init(&entry->list); kfree(entry); } + if (ret >= 0) + *last_scanned_ret = max(*last_scanned_ret, start + len); return ret; } @@ -1590,6 +1619,7 @@ int btrfs_defrag_file(struct inode *inode, struct file_ra_state *ra, while (cur < last_byte) { const unsigned long prev_sectors_defragged = sectors_defragged; + u64 last_scanned = cur; u64 cluster_end; /* The cluster size 256K should always be page aligned */ @@ -1619,8 +1649,8 @@ int btrfs_defrag_file(struct inode *inode, struct file_ra_state *ra, BTRFS_I(inode)->defrag_compress = compress_type; ret = defrag_one_cluster(BTRFS_I(inode), ra, cur, cluster_end + 1 - cur, extent_thresh, - newer_than, do_compress, - §ors_defragged, max_to_defrag); + newer_than, do_compress, §ors_defragged, + max_to_defrag, &last_scanned); if (sectors_defragged > prev_sectors_defragged) balance_dirty_pages_ratelimited(inode->i_mapping); @@ -1628,7 +1658,7 @@ int btrfs_defrag_file(struct inode *inode, struct file_ra_state *ra, btrfs_inode_unlock(inode, 0); if (ret < 0) break; - cur = cluster_end + 1; + cur = max(cluster_end + 1, last_scanned); if (ret > 0) { ret = 0; break; |