From d8926bb3badd36670fecf2de4a062c78bc37430b Mon Sep 17 00:00:00 2001 From: Mark Fasheh Date: Wed, 13 Jul 2011 10:38:47 -0700 Subject: btrfs: don't BUG_ON btrfs_alloc_path() errors This patch fixes many callers of btrfs_alloc_path() which BUG_ON allocation failure. All the sites that are fixed in this patch were checked by me to be fairly trivial to fix because of at least one of two criteria: - Callers of the function catch errors from it already so bubbling the error up will be handled. - Callers of the function might BUG_ON any nonzero return code in which case there is no behavior changed (but we still got to remove a BUG_ON) The following functions were updated: btrfs_lookup_extent, alloc_reserved_tree_block, btrfs_remove_block_group, btrfs_lookup_csums_range, btrfs_csum_file_blocks, btrfs_mark_extent_written, btrfs_inode_by_name, btrfs_new_inode, btrfs_symlink, insert_reserved_file_extent, and run_delalloc_nocow Signed-off-by: Mark Fasheh --- fs/btrfs/extent-tree.c | 12 +++++++++--- fs/btrfs/file-item.c | 7 +++++-- fs/btrfs/file.c | 3 ++- fs/btrfs/inode.c | 18 +++++++++++++----- 4 files changed, 29 insertions(+), 11 deletions(-) (limited to 'fs') diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 71cd456fdb6..aa91773fe31 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -667,7 +667,9 @@ int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len) struct btrfs_path *path; path = btrfs_alloc_path(); - BUG_ON(!path); + if (!path) + return -ENOMEM; + key.objectid = start; key.offset = len; btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); @@ -5494,7 +5496,8 @@ static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, u32 size = sizeof(*extent_item) + sizeof(*block_info) + sizeof(*iref); path = btrfs_alloc_path(); - BUG_ON(!path); + if (!path) + return -ENOMEM; path->leave_spinning = 1; ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, @@ -7162,7 +7165,10 @@ int btrfs_remove_block_group(struct btrfs_trans_handle *trans, spin_unlock(&cluster->refill_lock); path = btrfs_alloc_path(); - BUG_ON(!path); + if (!path) { + ret = -ENOMEM; + goto out; + } inode = lookup_free_space_inode(root, block_group, path); if (!IS_ERR(inode)) { diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c index 90d4ee52cd4..f92ff0ed6e0 100644 --- a/fs/btrfs/file-item.c +++ b/fs/btrfs/file-item.c @@ -282,7 +282,8 @@ int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end, u16 csum_size = btrfs_super_csum_size(&root->fs_info->super_copy); path = btrfs_alloc_path(); - BUG_ON(!path); + if (!path) + return -ENOMEM; if (search_commit) { path->skip_locking = 1; @@ -672,7 +673,9 @@ int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans, btrfs_super_csum_size(&root->fs_info->super_copy); path = btrfs_alloc_path(); - BUG_ON(!path); + if (!path) + return -ENOMEM; + sector_sum = sums->sums; again: next_offset = (u64)-1; diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index fa4ef18b66b..23d1d811e2b 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -855,7 +855,8 @@ int btrfs_mark_extent_written(struct btrfs_trans_handle *trans, btrfs_drop_extent_cache(inode, start, end - 1, 0); path = btrfs_alloc_path(); - BUG_ON(!path); + if (!path) + return -ENOMEM; again: recow = 0; split = start; diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 3601f0aebdd..8be7d7a759c 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -1070,7 +1070,8 @@ static noinline int run_delalloc_nocow(struct inode *inode, u64 ino = btrfs_ino(inode); path = btrfs_alloc_path(); - BUG_ON(!path); + if (!path) + return -ENOMEM; nolock = is_free_space_inode(root, inode); @@ -1644,7 +1645,8 @@ static int insert_reserved_file_extent(struct btrfs_trans_handle *trans, int ret; path = btrfs_alloc_path(); - BUG_ON(!path); + if (!path) + return -ENOMEM; path->leave_spinning = 1; @@ -3713,7 +3715,8 @@ static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, int ret = 0; path = btrfs_alloc_path(); - BUG_ON(!path); + if (!path) + return -ENOMEM; di = btrfs_lookup_dir_item(NULL, root, path, btrfs_ino(dir), name, namelen, 0); @@ -4438,7 +4441,8 @@ static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, int owner; path = btrfs_alloc_path(); - BUG_ON(!path); + if (!path) + return ERR_PTR(-ENOMEM); inode = new_inode(root->fs_info->sb); if (!inode) { @@ -7194,7 +7198,11 @@ static int btrfs_symlink(struct inode *dir, struct dentry *dentry, goto out_unlock; path = btrfs_alloc_path(); - BUG_ON(!path); + if (!path) { + err = -ENOMEM; + drop_inode = 1; + goto out_unlock; + } key.objectid = btrfs_ino(inode); key.offset = 0; btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); -- cgit v1.2.3 From 1e5063d093b5f024ae35bf835ca07463de2c1a1f Mon Sep 17 00:00:00 2001 From: Mark Fasheh Date: Tue, 12 Jul 2011 10:46:06 -0700 Subject: btrfs: Don't BUG_ON alloc_path errors in replay_one_buffer() The two ->process_func call sites in tree-log.c which were ignoring a return code have also been updated to gracefully exit as well. Signed-off-by: Mark Fasheh --- fs/btrfs/tree-log.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) (limited to 'fs') diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c index 4ce8a9f41d1..f3cacc07910 100644 --- a/fs/btrfs/tree-log.c +++ b/fs/btrfs/tree-log.c @@ -1617,7 +1617,8 @@ static int replay_one_buffer(struct btrfs_root *log, struct extent_buffer *eb, return 0; path = btrfs_alloc_path(); - BUG_ON(!path); + if (!path) + return -ENOMEM; nritems = btrfs_header_nritems(eb); for (i = 0; i < nritems; i++) { @@ -1723,7 +1724,9 @@ static noinline int walk_down_log_tree(struct btrfs_trans_handle *trans, return -ENOMEM; if (*level == 1) { - wc->process_func(root, next, wc, ptr_gen); + ret = wc->process_func(root, next, wc, ptr_gen); + if (ret) + return ret; path->slots[*level]++; if (wc->free) { @@ -1788,8 +1791,11 @@ static noinline int walk_up_log_tree(struct btrfs_trans_handle *trans, parent = path->nodes[*level + 1]; root_owner = btrfs_header_owner(parent); - wc->process_func(root, path->nodes[*level], wc, + ret = wc->process_func(root, path->nodes[*level], wc, btrfs_header_generation(path->nodes[*level])); + if (ret) + return ret; + if (wc->free) { struct extent_buffer *next; -- cgit v1.2.3 From 0eb0e19cde6f01397ef8c0e094e44beb75c62a1e Mon Sep 17 00:00:00 2001 From: Mark Fasheh Date: Tue, 12 Jul 2011 16:44:10 -0700 Subject: btrfs: Don't BUG_ON alloc_path errors in btrfs_truncate_inode_items I moved the path allocation up a few lines to the top of the function so that we couldn't get into the state where we've dropped delayed items and the extent cache but fail due to -ENOMEM. Signed-off-by: Mark Fasheh --- fs/btrfs/inode.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) (limited to 'fs') diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 8be7d7a759c..a0faf7d7f0e 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -3172,6 +3172,11 @@ int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans, BUG_ON(new_size > 0 && min_type != BTRFS_EXTENT_DATA_KEY); + path = btrfs_alloc_path(); + if (!path) + return -ENOMEM; + path->reada = -1; + if (root->ref_cows || root == root->fs_info->tree_root) btrfs_drop_extent_cache(inode, new_size & (~mask), (u64)-1, 0); @@ -3184,10 +3189,6 @@ int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans, if (min_type == 0 && root == BTRFS_I(inode)->root) btrfs_kill_delayed_inode_items(inode); - path = btrfs_alloc_path(); - BUG_ON(!path); - path->reada = -1; - key.objectid = ino; key.offset = (u64)-1; key.type = (u8)-1; -- cgit v1.2.3 From 1748f843a0190ef4332d03a64263f383af72682b Mon Sep 17 00:00:00 2001 From: Mark Fasheh Date: Tue, 12 Jul 2011 11:25:31 -0700 Subject: btrfs: Don't BUG_ON alloc_path errors in btrfs_read_locked_inode btrfs_iget() also needed an update so that errors from btrfs_locked_inode() are caught and bubbled back up. Signed-off-by: Mark Fasheh --- fs/btrfs/inode.c | 22 +++++++++++++++++----- 1 file changed, 17 insertions(+), 5 deletions(-) (limited to 'fs') diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index a0faf7d7f0e..88829993db6 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -2518,7 +2518,9 @@ static void btrfs_read_locked_inode(struct inode *inode) filled = true; path = btrfs_alloc_path(); - BUG_ON(!path); + if (!path) + goto make_bad; + path->leave_spinning = 1; memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); @@ -3973,6 +3975,7 @@ struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location, struct btrfs_root *root, int *new) { struct inode *inode; + int bad_inode = 0; inode = btrfs_iget_locked(s, location->objectid, root); if (!inode) @@ -3982,10 +3985,19 @@ struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location, BTRFS_I(inode)->root = root; memcpy(&BTRFS_I(inode)->location, location, sizeof(*location)); btrfs_read_locked_inode(inode); - inode_tree_add(inode); - unlock_new_inode(inode); - if (new) - *new = 1; + if (!is_bad_inode(inode)) { + inode_tree_add(inode); + unlock_new_inode(inode); + if (new) + *new = 1; + } else { + bad_inode = 1; + } + } + + if (bad_inode) { + iput(inode); + inode = ERR_PTR(-ESTALE); } return inode; -- cgit v1.2.3 From 17e9f796bd92cddec17d781c459376f82340fa44 Mon Sep 17 00:00:00 2001 From: Mark Fasheh Date: Tue, 12 Jul 2011 11:10:23 -0700 Subject: btrfs: Don't BUG_ON alloc_path errors in btrfs_balance() Dealing with this seems trivial - the only caller of btrfs_balance() is btrfs_ioctl() which passes the error code directly back to userspace. There also isn't much state to unwind (if I'm wrong about this point, we can always safely move the allocation to the top of btrfs_balance() anyway). Signed-off-by: Mark Fasheh --- fs/btrfs/volumes.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'fs') diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 19450bc5363..530a2fcea1e 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -2061,8 +2061,10 @@ int btrfs_balance(struct btrfs_root *dev_root) /* step two, relocate all the chunks */ path = btrfs_alloc_path(); - BUG_ON(!path); - + if (!path) { + ret = -ENOMEM; + goto error; + } key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; key.offset = (u64)-1; key.type = BTRFS_CHUNK_ITEM_KEY; -- cgit v1.2.3 From 92b8e897f6e7ba4aa10037ebd8186f85d39330d0 Mon Sep 17 00:00:00 2001 From: Mark Fasheh Date: Tue, 12 Jul 2011 10:57:59 -0700 Subject: btrfs: Don't BUG_ON alloc_path errors in find_next_chunk I also removed the BUG_ON from error return of find_next_chunk in init_first_rw_device(). It turns out that the only caller of init_first_rw_device() also BUGS on any nonzero return so no actual behavior change has occurred here. do_chunk_alloc() also needed an update since it calls btrfs_alloc_chunk() which can now return -ENOMEM. Instead of setting space_info->full on any error from btrfs_alloc_chunk() I catch and return every error value _except_ -ENOSPC. Thanks goes to Tsutomu Itoh for pointing that issue out. Signed-off-by: Mark Fasheh --- fs/btrfs/extent-tree.c | 4 ++++ fs/btrfs/volumes.c | 6 ++++-- 2 files changed, 8 insertions(+), 2 deletions(-) (limited to 'fs') diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index aa91773fe31..f6af4236e59 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -3277,6 +3277,9 @@ again: } ret = btrfs_alloc_chunk(trans, extent_root, flags); + if (ret < 0 && ret != -ENOSPC) + goto out; + spin_lock(&space_info->lock); if (ret) space_info->full = 1; @@ -3286,6 +3289,7 @@ again: space_info->force_alloc = CHUNK_ALLOC_NO_FORCE; space_info->chunk_alloc = 0; spin_unlock(&space_info->lock); +out: mutex_unlock(&extent_root->fs_info->chunk_mutex); return ret; } diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 530a2fcea1e..90d956c17d9 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -1037,7 +1037,8 @@ static noinline int find_next_chunk(struct btrfs_root *root, struct btrfs_key found_key; path = btrfs_alloc_path(); - BUG_ON(!path); + if (!path) + return -ENOMEM; key.objectid = objectid; key.offset = (u64)-1; @@ -2663,7 +2664,8 @@ static noinline int init_first_rw_device(struct btrfs_trans_handle *trans, ret = find_next_chunk(fs_info->chunk_root, BTRFS_FIRST_CHUNK_TREE_OBJECTID, &chunk_offset); - BUG_ON(ret); + if (ret) + return ret; alloc_profile = BTRFS_BLOCK_GROUP_METADATA | (fs_info->metadata_alloc_profile & -- cgit v1.2.3 From 38a1a919535742af677303271eb4ff731547b706 Mon Sep 17 00:00:00 2001 From: Mark Fasheh Date: Wed, 13 Jul 2011 10:59:59 -0700 Subject: btrfs: don't BUG_ON allocation errors in btrfs_drop_snapshot In addition to properly handling allocation failure from btrfs_alloc_path, I also fixed up the kzalloc error handling code immediately below it. Signed-off-by: Mark Fasheh --- fs/btrfs/extent-tree.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) (limited to 'fs') diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index f6af4236e59..6bce721e7bb 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -6272,10 +6272,14 @@ int btrfs_drop_snapshot(struct btrfs_root *root, int level; path = btrfs_alloc_path(); - BUG_ON(!path); + if (!path) + return -ENOMEM; wc = kzalloc(sizeof(*wc), GFP_NOFS); - BUG_ON(!wc); + if (!wc) { + btrfs_free_path(path); + return -ENOMEM; + } trans = btrfs_start_transaction(tree_root, 0); BUG_ON(IS_ERR(trans)); -- cgit v1.2.3 From a0f98dde11a1afe9fbf5c98f57968e086e98b6f5 Mon Sep 17 00:00:00 2001 From: Wanlong Gao Date: Mon, 18 Jul 2011 12:19:35 +0000 Subject: Btrfs:don't check the return value of __btrfs_add_inode_defrag Don't need to check the return value of __btrfs_add_inode_defrag(), since it will always return 0. Signed-off-by: Wanlong Gao Signed-off-by: Chris Mason --- fs/btrfs/file.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) (limited to 'fs') diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index 41ca5fdaee6..7f134a730ef 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -74,7 +74,7 @@ struct inode_defrag { * If an existing record is found the defrag item you * pass in is freed */ -static int __btrfs_add_inode_defrag(struct inode *inode, +static void __btrfs_add_inode_defrag(struct inode *inode, struct inode_defrag *defrag) { struct btrfs_root *root = BTRFS_I(inode)->root; @@ -106,11 +106,11 @@ static int __btrfs_add_inode_defrag(struct inode *inode, BTRFS_I(inode)->in_defrag = 1; rb_link_node(&defrag->rb_node, parent, p); rb_insert_color(&defrag->rb_node, &root->fs_info->defrag_inodes); - return 0; + return; exists: kfree(defrag); - return 0; + return; } @@ -123,7 +123,6 @@ int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans, { struct btrfs_root *root = BTRFS_I(inode)->root; struct inode_defrag *defrag; - int ret = 0; u64 transid; if (!btrfs_test_opt(root, AUTO_DEFRAG)) @@ -150,9 +149,9 @@ int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans, spin_lock(&root->fs_info->defrag_inodes_lock); if (!BTRFS_I(inode)->in_defrag) - ret = __btrfs_add_inode_defrag(inode, defrag); + __btrfs_add_inode_defrag(inode, defrag); spin_unlock(&root->fs_info->defrag_inodes_lock); - return ret; + return 0; } /* -- cgit v1.2.3 From b532402e4d147e4f409c4e7f50d4413e8450101d Mon Sep 17 00:00:00 2001 From: Tsutomu Itoh Date: Tue, 19 Jul 2011 07:27:20 +0000 Subject: Btrfs: return error to caller when btrfs_unlink() failes When btrfs_unlink_inode() and btrfs_orphan_add() in btrfs_unlink() are error, the error code is returned to the caller instead of BUG_ON(). Signed-off-by: Tsutomu Itoh Signed-off-by: Chris Mason --- fs/btrfs/extent-tree.c | 3 ++- fs/btrfs/inode.c | 10 +++++++--- 2 files changed, 9 insertions(+), 4 deletions(-) (limited to 'fs') diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 55bddffede7..db2057f262a 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -7201,7 +7201,8 @@ int btrfs_remove_block_group(struct btrfs_trans_handle *trans, inode = lookup_free_space_inode(root, block_group, path); if (!IS_ERR(inode)) { - btrfs_orphan_add(trans, inode); + ret = btrfs_orphan_add(trans, inode); + BUG_ON(ret); clear_nlink(inode); /* One for the block groups ref */ spin_lock(&block_group->lock); diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 4360ccb191b..5da43aea205 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -2217,7 +2217,8 @@ int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode) if (!root->orphan_block_rsv) { block_rsv = btrfs_alloc_block_rsv(root); - BUG_ON(!block_rsv); + if (!block_rsv) + return -ENOMEM; } spin_lock(&root->orphan_lock); @@ -3002,13 +3003,16 @@ static int btrfs_unlink(struct inode *dir, struct dentry *dentry) ret = btrfs_unlink_inode(trans, root, dir, dentry->d_inode, dentry->d_name.name, dentry->d_name.len); - BUG_ON(ret); + if (ret) + goto out; if (inode->i_nlink == 0) { ret = btrfs_orphan_add(trans, inode); - BUG_ON(ret); + if (ret) + goto out; } +out: nr = trans->blocks_used; __unlink_end_trans(trans, root); btrfs_btree_balance_dirty(root, nr); -- cgit v1.2.3 From b6973aa62253f3791ef6fa5e9f9de099645fc2bd Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Wed, 20 Jul 2011 03:46:35 +0000 Subject: Btrfs: fix readahead in file defrag We passed the wrong value to btrfs_force_ra(). Fix this by changing the argument of btrfs_force_ra() from last_index to nr_page. Signed-off-by: Li Zefan Signed-off-by: Chris Mason --- fs/btrfs/ctree.h | 11 ++++++++--- fs/btrfs/inode.c | 13 ------------- 2 files changed, 8 insertions(+), 16 deletions(-) (limited to 'fs') diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index 3be57c61104..7ac4d25fd4f 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -2520,6 +2520,14 @@ int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end, #define PageChecked PageFsMisc #endif +/* This forces readahead on a given range of bytes in an inode */ +static inline void btrfs_force_ra(struct address_space *mapping, + struct file_ra_state *ra, struct file *file, + pgoff_t offset, unsigned long req_size) +{ + page_cache_sync_readahead(mapping, ra, file, offset, req_size); +} + struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry); int btrfs_set_inode_index(struct inode *dir, u64 *index); int btrfs_unlink_inode(struct btrfs_trans_handle *trans, @@ -2548,9 +2556,6 @@ int btrfs_create_subvol_root(struct btrfs_trans_handle *trans, int btrfs_merge_bio_hook(struct page *page, unsigned long offset, size_t size, struct bio *bio, unsigned long bio_flags); -unsigned long btrfs_force_ra(struct address_space *mapping, - struct file_ra_state *ra, struct file *file, - pgoff_t offset, pgoff_t last_index); int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); int btrfs_readpage(struct file *file, struct page *page); void btrfs_evict_inode(struct inode *inode); diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 5da43aea205..69e448eddf0 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -6697,19 +6697,6 @@ int btrfs_create_subvol_root(struct btrfs_trans_handle *trans, return 0; } -/* helper function for file defrag and space balancing. This - * forces readahead on a given range of bytes in an inode - */ -unsigned long btrfs_force_ra(struct address_space *mapping, - struct file_ra_state *ra, struct file *file, - pgoff_t offset, pgoff_t last_index) -{ - pgoff_t req_size = last_index - offset + 1; - - page_cache_sync_readahead(mapping, ra, file, offset, req_size); - return offset + req_size; -} - struct inode *btrfs_alloc_inode(struct super_block *sb) { struct btrfs_inode *ei; -- cgit v1.2.3 From 1bf85046e493c88be1c1bad9084428373089f618 Mon Sep 17 00:00:00 2001 From: Jeff Mahoney Date: Thu, 21 Jul 2011 16:56:09 +0000 Subject: btrfs: Make extent-io callbacks that never fail return void The set/clear bit and the extent split/merge hooks only ever return 0. Changing them to return void simplifies the error handling cases later. This patch changes the hook prototypes, the single implementation of each, and the functions that call them to return void instead. Since all four of these hooks execute under a spinlock, they're necessarily simple. Signed-off-by: Jeff Mahoney Signed-off-by: Chris Mason --- fs/btrfs/extent_io.c | 52 ++++++++++++++-------------------------------------- fs/btrfs/extent_io.h | 18 +++++++++--------- fs/btrfs/inode.c | 26 +++++++++++--------------- 3 files changed, 34 insertions(+), 62 deletions(-) (limited to 'fs') diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 5bbdb243bb6..789d0b23048 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -254,14 +254,14 @@ static void merge_cb(struct extent_io_tree *tree, struct extent_state *new, * * This should be called with the tree lock held. */ -static int merge_state(struct extent_io_tree *tree, - struct extent_state *state) +static void merge_state(struct extent_io_tree *tree, + struct extent_state *state) { struct extent_state *other; struct rb_node *other_node; if (state->state & (EXTENT_IOBITS | EXTENT_BOUNDARY)) - return 0; + return; other_node = rb_prev(&state->rb_node); if (other_node) { @@ -287,19 +287,13 @@ static int merge_state(struct extent_io_tree *tree, free_extent_state(other); } } - - return 0; } -static int set_state_cb(struct extent_io_tree *tree, +static void set_state_cb(struct extent_io_tree *tree, struct extent_state *state, int *bits) { - if (tree->ops && tree->ops->set_bit_hook) { - return tree->ops->set_bit_hook(tree->mapping->host, - state, bits); - } - - return 0; + if (tree->ops && tree->ops->set_bit_hook) + tree->ops->set_bit_hook(tree->mapping->host, state, bits); } static void clear_state_cb(struct extent_io_tree *tree, @@ -325,7 +319,6 @@ static int insert_state(struct extent_io_tree *tree, { struct rb_node *node; int bits_to_set = *bits & ~EXTENT_CTLBITS; - int ret; if (end < start) { printk(KERN_ERR "btrfs end < start %llu %llu\n", @@ -335,9 +328,7 @@ static int insert_state(struct extent_io_tree *tree, } state->start = start; state->end = end; - ret = set_state_cb(tree, state, bits); - if (ret) - return ret; + set_state_cb(tree, state, bits); if (bits_to_set & EXTENT_DIRTY) tree->dirty_bytes += end - start + 1; @@ -357,13 +348,11 @@ static int insert_state(struct extent_io_tree *tree, return 0; } -static int split_cb(struct extent_io_tree *tree, struct extent_state *orig, +static void split_cb(struct extent_io_tree *tree, struct extent_state *orig, u64 split) { if (tree->ops && tree->ops->split_extent_hook) - return tree->ops->split_extent_hook(tree->mapping->host, - orig, split); - return 0; + tree->ops->split_extent_hook(tree->mapping->host, orig, split); } /* @@ -670,23 +659,18 @@ out: return 0; } -static int set_state_bits(struct extent_io_tree *tree, +static void set_state_bits(struct extent_io_tree *tree, struct extent_state *state, int *bits) { - int ret; int bits_to_set = *bits & ~EXTENT_CTLBITS; - ret = set_state_cb(tree, state, bits); - if (ret) - return ret; + set_state_cb(tree, state, bits); if ((bits_to_set & EXTENT_DIRTY) && !(state->state & EXTENT_DIRTY)) { u64 range = state->end - state->start + 1; tree->dirty_bytes += range; } state->state |= bits_to_set; - - return 0; } static void cache_state(struct extent_state *state, @@ -779,9 +763,7 @@ hit_next: goto out; } - err = set_state_bits(tree, state, &bits); - if (err) - goto out; + set_state_bits(tree, state, &bits); cache_state(state, cached_state); merge_state(tree, state); @@ -830,9 +812,7 @@ hit_next: if (err) goto out; if (state->end <= end) { - err = set_state_bits(tree, state, &bits); - if (err) - goto out; + set_state_bits(tree, state, &bits); cache_state(state, cached_state); merge_state(tree, state); if (last_end == (u64)-1) @@ -893,11 +873,7 @@ hit_next: err = split_state(tree, state, prealloc, end + 1); BUG_ON(err == -EEXIST); - err = set_state_bits(tree, prealloc, &bits); - if (err) { - prealloc = NULL; - goto out; - } + set_state_bits(tree, prealloc, &bits); cache_state(prealloc, cached_state); merge_state(tree, prealloc); prealloc = NULL; diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h index 21a7ca9e728..d6871dc7524 100644 --- a/fs/btrfs/extent_io.h +++ b/fs/btrfs/extent_io.h @@ -76,15 +76,15 @@ struct extent_io_ops { struct extent_state *state); int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end, struct extent_state *state, int uptodate); - int (*set_bit_hook)(struct inode *inode, struct extent_state *state, - int *bits); - int (*clear_bit_hook)(struct inode *inode, struct extent_state *state, - int *bits); - int (*merge_extent_hook)(struct inode *inode, - struct extent_state *new, - struct extent_state *other); - int (*split_extent_hook)(struct inode *inode, - struct extent_state *orig, u64 split); + void (*set_bit_hook)(struct inode *inode, struct extent_state *state, + int *bits); + void (*clear_bit_hook)(struct inode *inode, struct extent_state *state, + int *bits); + void (*merge_extent_hook)(struct inode *inode, + struct extent_state *new, + struct extent_state *other); + void (*split_extent_hook)(struct inode *inode, + struct extent_state *orig, u64 split); int (*write_cache_pages_lock_hook)(struct page *page); }; diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 69e448eddf0..34195f9fc6b 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -1283,17 +1283,16 @@ static int run_delalloc_range(struct inode *inode, struct page *locked_page, return ret; } -static int btrfs_split_extent_hook(struct inode *inode, - struct extent_state *orig, u64 split) +static void btrfs_split_extent_hook(struct inode *inode, + struct extent_state *orig, u64 split) { /* not delalloc, ignore it */ if (!(orig->state & EXTENT_DELALLOC)) - return 0; + return; spin_lock(&BTRFS_I(inode)->lock); BTRFS_I(inode)->outstanding_extents++; spin_unlock(&BTRFS_I(inode)->lock); - return 0; } /* @@ -1302,18 +1301,17 @@ static int btrfs_split_extent_hook(struct inode *inode, * extents, such as when we are doing sequential writes, so we can properly * account for the metadata space we'll need. */ -static int btrfs_merge_extent_hook(struct inode *inode, - struct extent_state *new, - struct extent_state *other) +static void btrfs_merge_extent_hook(struct inode *inode, + struct extent_state *new, + struct extent_state *other) { /* not delalloc, ignore it */ if (!(other->state & EXTENT_DELALLOC)) - return 0; + return; spin_lock(&BTRFS_I(inode)->lock); BTRFS_I(inode)->outstanding_extents--; spin_unlock(&BTRFS_I(inode)->lock); - return 0; } /* @@ -1321,8 +1319,8 @@ static int btrfs_merge_extent_hook(struct inode *inode, * bytes in this file, and to maintain the list of inodes that * have pending delalloc work to be done. */ -static int btrfs_set_bit_hook(struct inode *inode, - struct extent_state *state, int *bits) +static void btrfs_set_bit_hook(struct inode *inode, + struct extent_state *state, int *bits) { /* @@ -1352,14 +1350,13 @@ static int btrfs_set_bit_hook(struct inode *inode, } spin_unlock(&root->fs_info->delalloc_lock); } - return 0; } /* * extent_io.c clear_bit_hook, see set_bit_hook for why */ -static int btrfs_clear_bit_hook(struct inode *inode, - struct extent_state *state, int *bits) +static void btrfs_clear_bit_hook(struct inode *inode, + struct extent_state *state, int *bits) { /* * set_bit and clear bit hooks normally require _irqsave/restore @@ -1396,7 +1393,6 @@ static int btrfs_clear_bit_hook(struct inode *inode, } spin_unlock(&root->fs_info->delalloc_lock); } - return 0; } /* -- cgit v1.2.3 From 61cfea9bb84d41b09e59822c33b3eb27acc48358 Mon Sep 17 00:00:00 2001 From: WuBo Date: Tue, 26 Jul 2011 03:30:11 +0000 Subject: Btrfs: Protect the readonly flag of block group The access for ro in btrfs_block_group_cache should be protected because of the racy lock in relocation. Signed-off-by: Wu Bo Signed-off-by: Chris Mason --- fs/btrfs/extent-tree.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) (limited to 'fs') diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index db2057f262a..a4db88da125 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -6549,8 +6549,6 @@ static int set_block_group_ro(struct btrfs_block_group_cache *cache, int force) u64 min_allocable_bytes; int ret = -ENOSPC; - if (cache->ro) - return 0; /* * We need some metadata space and system metadata space for @@ -6566,6 +6564,12 @@ static int set_block_group_ro(struct btrfs_block_group_cache *cache, int force) spin_lock(&sinfo->lock); spin_lock(&cache->lock); + + if (cache->ro) { + ret = 0; + goto out; + } + num_bytes = cache->key.offset - cache->reserved - cache->pinned - cache->bytes_super - btrfs_block_group_used(&cache->item); @@ -6579,7 +6583,7 @@ static int set_block_group_ro(struct btrfs_block_group_cache *cache, int force) cache->ro = 1; ret = 0; } - +out: spin_unlock(&cache->lock); spin_unlock(&sinfo->lock); return ret; -- cgit v1.2.3 From ff1f2b4407454d926d8b143bf37e4dce66026a28 Mon Sep 17 00:00:00 2001 From: liubo Date: Wed, 27 Jul 2011 09:49:18 +0000 Subject: Btrfs: fix oops while writing data to SSD partitions Here I have a two SSD-partitions btrfs, and they are defaultly set to "data=raid0, metadata=raid1", then I try to fill my btrfs partition till "No space left on device", via "dd if=/dev/zero of=/mnt/btrfs/tmp". I get an oops panic from kernel BUG at fs/btrfs/extent-tree.c:5199!, which refers to find_free_extent's BUG_ON(index != get_block_group_index(block_group)); In SSD mode, in order to find enough space to alloc, we may check the block_group cache which has been checked sometime before, but the index is not updated, where it hits the BUG_ON. Signed-off-by: Liu Bo Acked-by: Josef Bacik Signed-off-by: Chris Mason --- fs/btrfs/extent-tree.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'fs') diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index a4db88da125..b172b7fa488 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -5079,7 +5079,9 @@ have_block_group: * group is does point to and try again */ if (!last_ptr_loop && last_ptr->block_group && - last_ptr->block_group != block_group) { + last_ptr->block_group != block_group && + index <= + get_block_group_index(last_ptr->block_group)) { btrfs_put_block_group(block_group); block_group = last_ptr->block_group; -- cgit v1.2.3 From bf5f32ecb6caac52b4d1c083251b3dd4f40a0b7a Mon Sep 17 00:00:00 2001 From: Mark Fasheh Date: Thu, 14 Jul 2011 21:23:06 +0000 Subject: btrfs: make btrfs_set_root_node void This is fairly trivial - btrfs_set_root_node() - always returns zero so we can just make it void. All callers ignore the return code now anyway. I also made sure to check that none of the functions that btrfs_set_root_node() calls returns an error that we might have needed to catch and pass back. Signed-off-by: Mark Fasheh Signed-off-by: Chris Mason --- fs/btrfs/ctree.h | 4 ++-- fs/btrfs/root-tree.c | 5 ++--- 2 files changed, 4 insertions(+), 5 deletions(-) (limited to 'fs') diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index 7ac4d25fd4f..34ce4140bb4 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -2406,8 +2406,8 @@ int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct btrfs_root_item *item, struct btrfs_key *key); int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid); int btrfs_find_orphan_roots(struct btrfs_root *tree_root); -int btrfs_set_root_node(struct btrfs_root_item *item, - struct extent_buffer *node); +void btrfs_set_root_node(struct btrfs_root_item *item, + struct extent_buffer *node); void btrfs_check_and_init_root_item(struct btrfs_root_item *item); /* dir-item.c */ diff --git a/fs/btrfs/root-tree.c b/fs/btrfs/root-tree.c index ebe45443de0..f4099904565 100644 --- a/fs/btrfs/root-tree.c +++ b/fs/btrfs/root-tree.c @@ -71,13 +71,12 @@ out: return ret; } -int btrfs_set_root_node(struct btrfs_root_item *item, - struct extent_buffer *node) +void btrfs_set_root_node(struct btrfs_root_item *item, + struct extent_buffer *node) { btrfs_set_root_bytenr(item, node->start); btrfs_set_root_level(item, btrfs_header_level(node)); btrfs_set_root_generation(item, btrfs_header_generation(node)); - return 0; } /* -- cgit v1.2.3 From b783e62d9620445d1ca3de76badf0468cdd329ba Mon Sep 17 00:00:00 2001 From: Josef Bacik Date: Wed, 13 Jul 2011 15:03:50 +0000 Subject: Btrfs: don't print the leaf if we had an error In __btrfs_free_extent we will print the leaf if we fail to find the extent we wanted, but the problem is if we get an error we won't have a leaf so often this leads to a NULL pointer dereference and we lose the error that actually occurred. So only print the leaf if ret > 0, which means we didn't find the item we were looking for but we didn't error either. This way the error is preserved. Signed-off-by: Josef Bacik Signed-off-by: Chris Mason --- fs/btrfs/extent-tree.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'fs') diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index b172b7fa488..66bac226944 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -4462,7 +4462,9 @@ static int __btrfs_free_extent(struct btrfs_trans_handle *trans, printk(KERN_ERR "umm, got %d back from search" ", was looking for %llu\n", ret, (unsigned long long)bytenr); - btrfs_print_leaf(extent_root, path->nodes[0]); + if (ret > 0) + btrfs_print_leaf(extent_root, + path->nodes[0]); } BUG_ON(ret); extent_slot = path->slots[0]; -- cgit v1.2.3 From 77906a5075a4eb767026c2e07b1a412d08aea5be Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Thu, 14 Jul 2011 03:16:00 +0000 Subject: Btrfs: copy string correctly in INO_LOOKUP ioctl Memory areas [ptr, ptr+total_len] and [name, name+total_len] may overlap, so it's wrong to use memcpy(). Signed-off-by: Li Zefan Signed-off-by: Chris Mason --- fs/btrfs/ioctl.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) (limited to 'fs') diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index fd252fff4c6..2bb08862a4f 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -1757,11 +1757,10 @@ static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, key.objectid = key.offset; key.offset = (u64)-1; dirid = key.objectid; - } if (ptr < name) goto out; - memcpy(name, ptr, total_len); + memmove(name, ptr, total_len); name[total_len]='\0'; ret = 0; out: -- cgit v1.2.3 From e55179b3d7d41d83fd6b5f59325f4a8d8ac9700a Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Thu, 14 Jul 2011 03:16:47 +0000 Subject: Btrfs: check the nodatasum flag when writing compressed files If mounting with nodatasum option, we won't csum file data for general write or direct-io write, and this rule should also be applied when writing compressed files. Signed-off-by: Li Zefan Signed-off-by: Chris Mason --- fs/btrfs/compression.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) (limited to 'fs') diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c index bfe42b03eaf..8ec5d86f173 100644 --- a/fs/btrfs/compression.c +++ b/fs/btrfs/compression.c @@ -338,6 +338,7 @@ int btrfs_submit_compressed_write(struct inode *inode, u64 start, u64 first_byte = disk_start; struct block_device *bdev; int ret; + int skip_sum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM; WARN_ON(start & ((u64)PAGE_CACHE_SIZE - 1)); cb = kmalloc(compressed_bio_size(root, compressed_len), GFP_NOFS); @@ -392,8 +393,11 @@ int btrfs_submit_compressed_write(struct inode *inode, u64 start, ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0); BUG_ON(ret); - ret = btrfs_csum_one_bio(root, inode, bio, start, 1); - BUG_ON(ret); + if (!skip_sum) { + ret = btrfs_csum_one_bio(root, inode, bio, + start, 1); + BUG_ON(ret); + } ret = btrfs_map_bio(root, WRITE, bio, 0, 1); BUG_ON(ret); @@ -418,8 +422,10 @@ int btrfs_submit_compressed_write(struct inode *inode, u64 start, ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0); BUG_ON(ret); - ret = btrfs_csum_one_bio(root, inode, bio, start, 1); - BUG_ON(ret); + if (!skip_sum) { + ret = btrfs_csum_one_bio(root, inode, bio, start, 1); + BUG_ON(ret); + } ret = btrfs_map_bio(root, WRITE, bio, 0, 1); BUG_ON(ret); -- cgit v1.2.3 From 72d63ed6427cf233e2b352c0b80c3e5c5a444986 Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Thu, 14 Jul 2011 03:17:00 +0000 Subject: Btrfs: use wait_event() Use wait_event() when possible to avoid code duplication. Signed-off-by: Li Zefan Signed-off-by: Chris Mason --- fs/btrfs/transaction.c | 59 ++++++-------------------------------------------- 1 file changed, 7 insertions(+), 52 deletions(-) (limited to 'fs') diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c index eb55863bb4a..ff5549fe462 100644 --- a/fs/btrfs/transaction.c +++ b/fs/btrfs/transaction.c @@ -216,17 +216,11 @@ static void wait_current_trans(struct btrfs_root *root) spin_lock(&root->fs_info->trans_lock); cur_trans = root->fs_info->running_transaction; if (cur_trans && cur_trans->blocked) { - DEFINE_WAIT(wait); atomic_inc(&cur_trans->use_count); spin_unlock(&root->fs_info->trans_lock); - while (1) { - prepare_to_wait(&root->fs_info->transaction_wait, &wait, - TASK_UNINTERRUPTIBLE); - if (!cur_trans->blocked) - break; - schedule(); - } - finish_wait(&root->fs_info->transaction_wait, &wait); + + wait_event(root->fs_info->transaction_wait, + !cur_trans->blocked); put_transaction(cur_trans); } else { spin_unlock(&root->fs_info->trans_lock); @@ -360,15 +354,7 @@ struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root static noinline int wait_for_commit(struct btrfs_root *root, struct btrfs_transaction *commit) { - DEFINE_WAIT(wait); - while (!commit->commit_done) { - prepare_to_wait(&commit->commit_wait, &wait, - TASK_UNINTERRUPTIBLE); - if (commit->commit_done) - break; - schedule(); - } - finish_wait(&commit->commit_wait, &wait); + wait_event(commit->commit_wait, commit->commit_done); return 0; } @@ -1085,22 +1071,7 @@ int btrfs_transaction_blocked(struct btrfs_fs_info *info) static void wait_current_trans_commit_start(struct btrfs_root *root, struct btrfs_transaction *trans) { - DEFINE_WAIT(wait); - - if (trans->in_commit) - return; - - while (1) { - prepare_to_wait(&root->fs_info->transaction_blocked_wait, &wait, - TASK_UNINTERRUPTIBLE); - if (trans->in_commit) { - finish_wait(&root->fs_info->transaction_blocked_wait, - &wait); - break; - } - schedule(); - finish_wait(&root->fs_info->transaction_blocked_wait, &wait); - } + wait_event(root->fs_info->transaction_blocked_wait, trans->in_commit); } /* @@ -1110,24 +1081,8 @@ static void wait_current_trans_commit_start(struct btrfs_root *root, static void wait_current_trans_commit_start_and_unblock(struct btrfs_root *root, struct btrfs_transaction *trans) { - DEFINE_WAIT(wait); - - if (trans->commit_done || (trans->in_commit && !trans->blocked)) - return; - - while (1) { - prepare_to_wait(&root->fs_info->transaction_wait, &wait, - TASK_UNINTERRUPTIBLE); - if (trans->commit_done || - (trans->in_commit && !trans->blocked)) { - finish_wait(&root->fs_info->transaction_wait, - &wait); - break; - } - schedule(); - finish_wait(&root->fs_info->transaction_wait, - &wait); - } + wait_event(root->fs_info->transaction_wait, + trans->commit_done || (trans->in_commit && !trans->blocked)); } /* -- cgit v1.2.3 From b9c8300c2ac354d850159f301d5b3ead13854cdd Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Thu, 14 Jul 2011 03:17:14 +0000 Subject: Btrfs: remove a BUG_ON() in btrfs_commit_transaction() wait_for_commit() always returns 0. Signed-off-by: Li Zefan Signed-off-by: Chris Mason --- fs/btrfs/transaction.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) (limited to 'fs') diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c index ff5549fe462..7dc36fab4af 100644 --- a/fs/btrfs/transaction.c +++ b/fs/btrfs/transaction.c @@ -351,11 +351,10 @@ struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root } /* wait for a transaction commit to be fully complete */ -static noinline int wait_for_commit(struct btrfs_root *root, +static noinline void wait_for_commit(struct btrfs_root *root, struct btrfs_transaction *commit) { wait_event(commit->commit_wait, commit->commit_done); - return 0; } int btrfs_wait_for_commit(struct btrfs_root *root, u64 transid) @@ -1189,8 +1188,7 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans, atomic_inc(&cur_trans->use_count); btrfs_end_transaction(trans, root); - ret = wait_for_commit(root, cur_trans); - BUG_ON(ret); + wait_for_commit(root, cur_trans); put_transaction(cur_trans); -- cgit v1.2.3 From 15de900d08bb132833c8622610ddb1be660a6018 Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Thu, 14 Jul 2011 03:17:27 +0000 Subject: Btrfs: remove remaining ref-cache code Since commit f2a97a9dbd86eb1ef956bdf20e05c507b32beb96 ("btrfs: remove all unused functions"), there's no extern functions at all in ref-cache.c, so just remove the remaining dead code. Signed-off-by: Li Zefan Signed-off-by: Chris Mason --- fs/btrfs/ref-cache.c | 68 ---------------------------------------------------- fs/btrfs/ref-cache.h | 52 ---------------------------------------- 2 files changed, 120 deletions(-) delete mode 100644 fs/btrfs/ref-cache.c delete mode 100644 fs/btrfs/ref-cache.h (limited to 'fs') diff --git a/fs/btrfs/ref-cache.c b/fs/btrfs/ref-cache.c deleted file mode 100644 index 82d569cb626..00000000000 --- a/fs/btrfs/ref-cache.c +++ /dev/null @@ -1,68 +0,0 @@ -/* - * Copyright (C) 2008 Oracle. All rights reserved. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public - * License v2 as published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public - * License along with this program; if not, write to the - * Free Software Foundation, Inc., 59 Temple Place - Suite 330, - * Boston, MA 021110-1307, USA. - */ - -#include -#include -#include -#include "ctree.h" -#include "ref-cache.h" -#include "transaction.h" - -static struct rb_node *tree_insert(struct rb_root *root, u64 bytenr, - struct rb_node *node) -{ - struct rb_node **p = &root->rb_node; - struct rb_node *parent = NULL; - struct btrfs_leaf_ref *entry; - - while (*p) { - parent = *p; - entry = rb_entry(parent, struct btrfs_leaf_ref, rb_node); - - if (bytenr < entry->bytenr) - p = &(*p)->rb_left; - else if (bytenr > entry->bytenr) - p = &(*p)->rb_right; - else - return parent; - } - - entry = rb_entry(node, struct btrfs_leaf_ref, rb_node); - rb_link_node(node, parent, p); - rb_insert_color(node, root); - return NULL; -} - -static struct rb_node *tree_search(struct rb_root *root, u64 bytenr) -{ - struct rb_node *n = root->rb_node; - struct btrfs_leaf_ref *entry; - - while (n) { - entry = rb_entry(n, struct btrfs_leaf_ref, rb_node); - WARN_ON(!entry->in_tree); - - if (bytenr < entry->bytenr) - n = n->rb_left; - else if (bytenr > entry->bytenr) - n = n->rb_right; - else - return n; - } - return NULL; -} diff --git a/fs/btrfs/ref-cache.h b/fs/btrfs/ref-cache.h deleted file mode 100644 index 24f7001f638..00000000000 --- a/fs/btrfs/ref-cache.h +++ /dev/null @@ -1,52 +0,0 @@ -/* - * Copyright (C) 2008 Oracle. All rights reserved. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public - * License v2 as published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public - * License along with this program; if not, write to the - * Free Software Foundation, Inc., 59 Temple Place - Suite 330, - * Boston, MA 021110-1307, USA. - */ -#ifndef __REFCACHE__ -#define __REFCACHE__ - -struct btrfs_extent_info { - /* bytenr and num_bytes find the extent in the extent allocation tree */ - u64 bytenr; - u64 num_bytes; - - /* objectid and offset find the back reference for the file */ - u64 objectid; - u64 offset; -}; - -struct btrfs_leaf_ref { - struct rb_node rb_node; - struct btrfs_leaf_ref_tree *tree; - int in_tree; - atomic_t usage; - - u64 root_gen; - u64 bytenr; - u64 owner; - u64 generation; - int nritems; - - struct list_head list; - struct btrfs_extent_info extents[]; -}; - -static inline size_t btrfs_leaf_ref_size(int nr_extents) -{ - return sizeof(struct btrfs_leaf_ref) + - sizeof(struct btrfs_extent_info) * nr_extents; -} -#endif -- cgit v1.2.3 From 9b89d95a143bb0a9abc4ba0fdcdda78211930f1a Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Thu, 14 Jul 2011 03:17:39 +0000 Subject: Btrfs: make acl functions really no-op if acl is not enabled So there's no overhead for something we don't use. Signed-off-by: Li Zefan Signed-off-by: Chris Mason --- fs/btrfs/Makefile | 4 +++- fs/btrfs/acl.c | 17 ----------------- fs/btrfs/ctree.h | 15 ++++++++++++--- 3 files changed, 15 insertions(+), 21 deletions(-) (limited to 'fs') diff --git a/fs/btrfs/Makefile b/fs/btrfs/Makefile index 9b72dcf1cd2..40e6ac08c21 100644 --- a/fs/btrfs/Makefile +++ b/fs/btrfs/Makefile @@ -6,5 +6,7 @@ btrfs-y += super.o ctree.o extent-tree.o print-tree.o root-tree.o dir-item.o \ transaction.o inode.o file.o tree-defrag.o \ extent_map.o sysfs.o struct-funcs.o xattr.o ordered-data.o \ extent_io.o volumes.o async-thread.o ioctl.o locking.o orphan.o \ - export.o tree-log.o acl.o free-space-cache.o zlib.o lzo.o \ + export.o tree-log.o free-space-cache.o zlib.o lzo.o \ compression.o delayed-ref.o relocation.o delayed-inode.o scrub.o + +btrfs-$(CONFIG_BTRFS_FS_POSIX_ACL) += acl.o diff --git a/fs/btrfs/acl.c b/fs/btrfs/acl.c index f66fc995973..b206d4c2720 100644 --- a/fs/btrfs/acl.c +++ b/fs/btrfs/acl.c @@ -28,8 +28,6 @@ #include "btrfs_inode.h" #include "xattr.h" -#ifdef CONFIG_BTRFS_FS_POSIX_ACL - static struct posix_acl *btrfs_get_acl(struct inode *inode, int type) { int size; @@ -318,18 +316,3 @@ const struct xattr_handler btrfs_xattr_acl_access_handler = { .get = btrfs_xattr_acl_get, .set = btrfs_xattr_acl_set, }; - -#else /* CONFIG_BTRFS_FS_POSIX_ACL */ - -int btrfs_acl_chmod(struct inode *inode) -{ - return 0; -} - -int btrfs_init_acl(struct btrfs_trans_handle *trans, - struct inode *inode, struct inode *dir) -{ - return 0; -} - -#endif /* CONFIG_BTRFS_FS_POSIX_ACL */ diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index 34ce4140bb4..a6263bdab81 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -2650,12 +2650,21 @@ do { \ /* acl.c */ #ifdef CONFIG_BTRFS_FS_POSIX_ACL int btrfs_check_acl(struct inode *inode, int mask, unsigned int flags); -#else -#define btrfs_check_acl NULL -#endif int btrfs_init_acl(struct btrfs_trans_handle *trans, struct inode *inode, struct inode *dir); int btrfs_acl_chmod(struct inode *inode); +#else +#define btrfs_check_acl NULL +static inline int btrfs_init_acl(struct btrfs_trans_handle *trans, + struct inode *inode, struct inode *dir) +{ + return 0; +} +static inline int btrfs_acl_chmod(struct inode *inode) +{ + return 0; +} +#endif /* relocation.c */ int btrfs_relocate_block_group(struct btrfs_root *root, u64 group_start); -- cgit v1.2.3 From 85d85a743da894029723e002eb556ceeebc03658 Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Thu, 14 Jul 2011 03:17:52 +0000 Subject: Btrfs: remove redundant code for dir item lookup When we search a dir item with a specific hash code, we can just return NULL without further checking if btrfs_search_slot() returns 1. Signed-off-by: Li Zefan Signed-off-by: Chris Mason --- fs/btrfs/dir-item.c | 30 ++---------------------------- 1 file changed, 2 insertions(+), 28 deletions(-) (limited to 'fs') diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c index c360a848d97..31d84e78129 100644 --- a/fs/btrfs/dir-item.c +++ b/fs/btrfs/dir-item.c @@ -198,8 +198,6 @@ struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_key key; int ins_len = mod < 0 ? -1 : 0; int cow = mod != 0; - struct btrfs_key found_key; - struct extent_buffer *leaf; key.objectid = dir; btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY); @@ -209,18 +207,7 @@ struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow); if (ret < 0) return ERR_PTR(ret); - if (ret > 0) { - if (path->slots[0] == 0) - return NULL; - path->slots[0]--; - } - - leaf = path->nodes[0]; - btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); - - if (found_key.objectid != dir || - btrfs_key_type(&found_key) != BTRFS_DIR_ITEM_KEY || - found_key.offset != key.offset) + if (ret > 0) return NULL; return btrfs_match_dir_item_name(root, path, name, name_len); @@ -315,8 +302,6 @@ struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans, struct btrfs_key key; int ins_len = mod < 0 ? -1 : 0; int cow = mod != 0; - struct btrfs_key found_key; - struct extent_buffer *leaf; key.objectid = dir; btrfs_set_key_type(&key, BTRFS_XATTR_ITEM_KEY); @@ -324,18 +309,7 @@ struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans, ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow); if (ret < 0) return ERR_PTR(ret); - if (ret > 0) { - if (path->slots[0] == 0) - return NULL; - path->slots[0]--; - } - - leaf = path->nodes[0]; - btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); - - if (found_key.objectid != dir || - btrfs_key_type(&found_key) != BTRFS_XATTR_ITEM_KEY || - found_key.offset != key.offset) + if (ret > 0) return NULL; return btrfs_match_dir_item_name(root, path, name, name_len); -- cgit v1.2.3 From 7e016a038e829c7d1271e1d57b8002860bbdf0db Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Thu, 14 Jul 2011 03:18:03 +0000 Subject: Btrfs: clean up search_extent_mapping() rb_node returned by __tree_search() can be a valid pointer or NULL, but won't be some errno. Signed-off-by: Li Zefan Signed-off-by: Chris Mason --- fs/btrfs/extent_map.c | 17 +++-------------- 1 file changed, 3 insertions(+), 14 deletions(-) (limited to 'fs') diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c index 2d0410344ea..911a9db801e 100644 --- a/fs/btrfs/extent_map.c +++ b/fs/btrfs/extent_map.c @@ -379,23 +379,12 @@ struct extent_map *search_extent_mapping(struct extent_map_tree *tree, em = rb_entry(next, struct extent_map, rb_node); goto found; } - if (!rb_node) { - em = NULL; - goto out; - } - if (IS_ERR(rb_node)) { - em = ERR_CAST(rb_node); - goto out; - } - em = rb_entry(rb_node, struct extent_map, rb_node); - goto found; - - em = NULL; - goto out; + if (!rb_node) + return NULL; + em = rb_entry(rb_node, struct extent_map, rb_node); found: atomic_inc(&em->refs); -out: return em; } -- cgit v1.2.3 From ed64f06652210b4a52fe0ea65ac43f9c6af1d988 Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Thu, 14 Jul 2011 03:18:15 +0000 Subject: Btrfs: clean up code for extent_map lookup lookup_extent_map() and search_extent_map() can share most of code. Signed-off-by: Li Zefan Signed-off-by: Chris Mason --- fs/btrfs/extent_map.c | 85 ++++++++++++++++++--------------------------------- 1 file changed, 29 insertions(+), 56 deletions(-) (limited to 'fs') diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c index 911a9db801e..df7a803005f 100644 --- a/fs/btrfs/extent_map.c +++ b/fs/btrfs/extent_map.c @@ -299,19 +299,8 @@ static u64 range_end(u64 start, u64 len) return start + len; } -/** - * lookup_extent_mapping - lookup extent_map - * @tree: tree to lookup in - * @start: byte offset to start the search - * @len: length of the lookup range - * - * Find and return the first extent_map struct in @tree that intersects the - * [start, len] range. There may be additional objects in the tree that - * intersect, so check the object returned carefully to make sure that no - * additional lookups are needed. - */ -struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree, - u64 start, u64 len) +struct extent_map *__lookup_extent_mapping(struct extent_map_tree *tree, + u64 start, u64 len, int strict) { struct extent_map *em; struct rb_node *rb_node; @@ -320,37 +309,41 @@ struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree, u64 end = range_end(start, len); rb_node = __tree_search(&tree->map, start, &prev, &next); - if (!rb_node && prev) { - em = rb_entry(prev, struct extent_map, rb_node); - if (end > em->start && start < extent_map_end(em)) - goto found; - } - if (!rb_node && next) { - em = rb_entry(next, struct extent_map, rb_node); - if (end > em->start && start < extent_map_end(em)) - goto found; - } if (!rb_node) { - em = NULL; - goto out; - } - if (IS_ERR(rb_node)) { - em = ERR_CAST(rb_node); - goto out; + if (prev) + rb_node = prev; + else if (next) + rb_node = next; + else + return NULL; } + em = rb_entry(rb_node, struct extent_map, rb_node); - if (end > em->start && start < extent_map_end(em)) - goto found; - em = NULL; - goto out; + if (strict && !(end > em->start && start < extent_map_end(em))) + return NULL; -found: atomic_inc(&em->refs); -out: return em; } +/** + * lookup_extent_mapping - lookup extent_map + * @tree: tree to lookup in + * @start: byte offset to start the search + * @len: length of the lookup range + * + * Find and return the first extent_map struct in @tree that intersects the + * [start, len] range. There may be additional objects in the tree that + * intersect, so check the object returned carefully to make sure that no + * additional lookups are needed. + */ +struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree, + u64 start, u64 len) +{ + return __lookup_extent_mapping(tree, start, len, 1); +} + /** * search_extent_mapping - find a nearby extent map * @tree: tree to lookup in @@ -365,27 +358,7 @@ out: struct extent_map *search_extent_mapping(struct extent_map_tree *tree, u64 start, u64 len) { - struct extent_map *em; - struct rb_node *rb_node; - struct rb_node *prev = NULL; - struct rb_node *next = NULL; - - rb_node = __tree_search(&tree->map, start, &prev, &next); - if (!rb_node && prev) { - em = rb_entry(prev, struct extent_map, rb_node); - goto found; - } - if (!rb_node && next) { - em = rb_entry(next, struct extent_map, rb_node); - goto found; - } - if (!rb_node) - return NULL; - - em = rb_entry(rb_node, struct extent_map, rb_node); -found: - atomic_inc(&em->refs); - return em; + return __lookup_extent_mapping(tree, start, len, 0); } /** -- cgit v1.2.3 From 4d2c8f62f12a6652db67cc0c1f4a4a498b05ddbc Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Thu, 14 Jul 2011 03:18:33 +0000 Subject: Btrfs: clean up code for merging extent maps unpin_extent_cache() and add_extent_mapping() shares the same code that merges extent maps. Signed-off-by: Li Zefan Signed-off-by: Chris Mason --- fs/btrfs/extent_map.c | 59 ++++++++++++++++++--------------------------------- 1 file changed, 21 insertions(+), 38 deletions(-) (limited to 'fs') diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c index df7a803005f..7c97b330145 100644 --- a/fs/btrfs/extent_map.c +++ b/fs/btrfs/extent_map.c @@ -183,22 +183,10 @@ static int mergable_maps(struct extent_map *prev, struct extent_map *next) return 0; } -int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len) +static void try_merge_map(struct extent_map_tree *tree, struct extent_map *em) { - int ret = 0; struct extent_map *merge = NULL; struct rb_node *rb; - struct extent_map *em; - - write_lock(&tree->lock); - em = lookup_extent_mapping(tree, start, len); - - WARN_ON(!em || em->start != start); - - if (!em) - goto out; - - clear_bit(EXTENT_FLAG_PINNED, &em->flags); if (em->start != 0) { rb = rb_prev(&em->rb_node); @@ -225,6 +213,24 @@ int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len) merge->in_tree = 0; free_extent_map(merge); } +} + +int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len) +{ + int ret = 0; + struct extent_map *em; + + write_lock(&tree->lock); + em = lookup_extent_mapping(tree, start, len); + + WARN_ON(!em || em->start != start); + + if (!em) + goto out; + + clear_bit(EXTENT_FLAG_PINNED, &em->flags); + + try_merge_map(tree, em); free_extent_map(em); out: @@ -247,7 +253,6 @@ int add_extent_mapping(struct extent_map_tree *tree, struct extent_map *em) { int ret = 0; - struct extent_map *merge = NULL; struct rb_node *rb; struct extent_map *exist; @@ -263,30 +268,8 @@ int add_extent_mapping(struct extent_map_tree *tree, goto out; } atomic_inc(&em->refs); - if (em->start != 0) { - rb = rb_prev(&em->rb_node); - if (rb) - merge = rb_entry(rb, struct extent_map, rb_node); - if (rb && mergable_maps(merge, em)) { - em->start = merge->start; - em->len += merge->len; - em->block_len += merge->block_len; - em->block_start = merge->block_start; - merge->in_tree = 0; - rb_erase(&merge->rb_node, &tree->map); - free_extent_map(merge); - } - } - rb = rb_next(&em->rb_node); - if (rb) - merge = rb_entry(rb, struct extent_map, rb_node); - if (rb && mergable_maps(em, merge)) { - em->len += merge->len; - em->block_len += merge->len; - rb_erase(&merge->rb_node, &tree->map); - merge->in_tree = 0; - free_extent_map(merge); - } + + try_merge_map(tree, em); out: return ret; } -- cgit v1.2.3 From 3a6d457ec79d4cdf2313189b4e852e53f2b8d2b2 Mon Sep 17 00:00:00 2001 From: Xiao Guangrong Date: Thu, 14 Jul 2011 03:18:52 +0000 Subject: Btrfs: remove unused members from struct extent_state These members are not used at all. Signed-off-by: Xiao Guangrong Signed-off-by: Li Zefan Signed-off-by: Chris Mason --- fs/btrfs/extent_io.h | 2 -- 1 file changed, 2 deletions(-) (limited to 'fs') diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h index d6871dc7524..7b2f0c3e792 100644 --- a/fs/btrfs/extent_io.h +++ b/fs/btrfs/extent_io.h @@ -108,8 +108,6 @@ struct extent_state { wait_queue_head_t wq; atomic_t refs; unsigned long state; - u64 split_start; - u64 split_end; /* for use by the FS */ u64 private; -- cgit v1.2.3 From 3150b6996934455d7f2da243939d80a9b839085a Mon Sep 17 00:00:00 2001 From: Xiao Guangrong Date: Thu, 14 Jul 2011 03:19:08 +0000 Subject: Btrfs: clean up for insert_state() Don't duplicate set_state_bits(). Signed-off-by: Xiao Guangrong Signed-off-by: Li Zefan Signed-off-by: Chris Mason --- fs/btrfs/extent_io.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) (limited to 'fs') diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 789d0b23048..0d69425d019 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -303,6 +303,9 @@ static void clear_state_cb(struct extent_io_tree *tree, tree->ops->clear_bit_hook(tree->mapping->host, state, bits); } +static void set_state_bits(struct extent_io_tree *tree, + struct extent_state *state, int *bits); + /* * insert an extent_state struct into the tree. 'bits' are set on the * struct before it is inserted. @@ -318,7 +321,6 @@ static int insert_state(struct extent_io_tree *tree, int *bits) { struct rb_node *node; - int bits_to_set = *bits & ~EXTENT_CTLBITS; if (end < start) { printk(KERN_ERR "btrfs end < start %llu %llu\n", @@ -328,11 +330,9 @@ static int insert_state(struct extent_io_tree *tree, } state->start = start; state->end = end; - set_state_cb(tree, state, bits); - if (bits_to_set & EXTENT_DIRTY) - tree->dirty_bytes += end - start + 1; - state->state |= bits_to_set; + set_state_bits(tree, state, bits); + node = tree_insert(&tree->state, end, &state->rb_node); if (node) { struct extent_state *found; -- cgit v1.2.3 From ded91f0814a349e36b3ca0eff497f816ad518fba Mon Sep 17 00:00:00 2001 From: Xiao Guangrong Date: Thu, 14 Jul 2011 03:19:27 +0000 Subject: Btrfs: clean up for wait_extent_bit() We can just use cond_resched_lock(). Signed-off-by: Xiao Guangrong Signed-off-by: Li Zefan Signed-off-by: Chris Mason --- fs/btrfs/extent_io.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-) (limited to 'fs') diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 0d69425d019..a0811e639f5 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -648,11 +648,7 @@ again: if (start > end) break; - if (need_resched()) { - spin_unlock(&tree->lock); - cond_resched(); - spin_lock(&tree->lock); - } + cond_resched_lock(&tree->lock); } out: spin_unlock(&tree->lock); -- cgit v1.2.3 From 69261c4b6a394ead1b5ca2966c908469355eb603 Mon Sep 17 00:00:00 2001 From: Xiao Guangrong Date: Thu, 14 Jul 2011 03:19:45 +0000 Subject: Btrfs: clean up for find_first_extent_bit() find_first_extent_bit() and find_first_extent_bit_state() share most of the code, and we can just make the former call the latter. Signed-off-by: Xiao Guangrong Signed-off-by: Li Zefan Signed-off-by: Chris Mason --- fs/btrfs/extent_io.c | 64 ++++++++++++++++++++-------------------------------- 1 file changed, 24 insertions(+), 40 deletions(-) (limited to 'fs') diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index a0811e639f5..a59ebc608cc 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -1031,46 +1031,6 @@ static int set_range_writeback(struct extent_io_tree *tree, u64 start, u64 end) return 0; } -/* - * find the first offset in the io tree with 'bits' set. zero is - * returned if we find something, and *start_ret and *end_ret are - * set to reflect the state struct that was found. - * - * If nothing was found, 1 is returned, < 0 on error - */ -int find_first_extent_bit(struct extent_io_tree *tree, u64 start, - u64 *start_ret, u64 *end_ret, int bits) -{ - struct rb_node *node; - struct extent_state *state; - int ret = 1; - - spin_lock(&tree->lock); - /* - * this search will find all the extents that end after - * our range starts. - */ - node = tree_search(tree, start); - if (!node) - goto out; - - while (1) { - state = rb_entry(node, struct extent_state, rb_node); - if (state->end >= start && (state->state & bits)) { - *start_ret = state->start; - *end_ret = state->end; - ret = 0; - break; - } - node = rb_next(node); - if (!node) - break; - } -out: - spin_unlock(&tree->lock); - return ret; -} - /* find the first state struct with 'bits' set after 'start', and * return it. tree->lock must be held. NULL will returned if * nothing was found after 'start' @@ -1102,6 +1062,30 @@ out: return NULL; } +/* + * find the first offset in the io tree with 'bits' set. zero is + * returned if we find something, and *start_ret and *end_ret are + * set to reflect the state struct that was found. + * + * If nothing was found, 1 is returned, < 0 on error + */ +int find_first_extent_bit(struct extent_io_tree *tree, u64 start, + u64 *start_ret, u64 *end_ret, int bits) +{ + struct extent_state *state; + int ret = 1; + + spin_lock(&tree->lock); + state = find_first_extent_bit_state(tree, start, bits); + if (state) { + *start_ret = state->start; + *end_ret = state->end; + ret = 0; + } + spin_unlock(&tree->lock); + return ret; +} + /* * find a contiguous range of bytes in the file marked as delalloc, not * more than 'max_bytes'. start and end are used to return the range, -- cgit v1.2.3 From 341d14f161a475ebdbc9adff1f7e681e1185dee9 Mon Sep 17 00:00:00 2001 From: Mitch Harder Date: Tue, 12 Jul 2011 19:43:45 +0000 Subject: Btrfs: Remove unused variable 'last_index' in file.c The variable 'last_index' is calculated in the __btrfs_buffered_write function and passed as a parameter to the prepare_pages function, but is not used anywhere in the prepare_pages function. Remove instances of 'last_index' in these functions. Signed-off-by: Mitch Harder Signed-off-by: Chris Mason --- fs/btrfs/file.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) (limited to 'fs') diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index 7f134a730ef..010aec8be82 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -1059,7 +1059,7 @@ static int prepare_uptodate_page(struct page *page, u64 pos) static noinline int prepare_pages(struct btrfs_root *root, struct file *file, struct page **pages, size_t num_pages, loff_t pos, unsigned long first_index, - unsigned long last_index, size_t write_bytes) + size_t write_bytes) { struct extent_state *cached_state = NULL; int i; @@ -1159,7 +1159,6 @@ static noinline ssize_t __btrfs_buffered_write(struct file *file, struct btrfs_root *root = BTRFS_I(inode)->root; struct page **pages = NULL; unsigned long first_index; - unsigned long last_index; size_t num_written = 0; int nrptrs; int ret = 0; @@ -1172,7 +1171,6 @@ static noinline ssize_t __btrfs_buffered_write(struct file *file, return -ENOMEM; first_index = pos >> PAGE_CACHE_SHIFT; - last_index = (pos + iov_iter_count(i)) >> PAGE_CACHE_SHIFT; while (iov_iter_count(i) > 0) { size_t offset = pos & (PAGE_CACHE_SIZE - 1); @@ -1206,8 +1204,7 @@ static noinline ssize_t __btrfs_buffered_write(struct file *file, * contents of pages from loop to loop */ ret = prepare_pages(root, file, pages, num_pages, - pos, first_index, last_index, - write_bytes); + pos, first_index, write_bytes); if (ret) { btrfs_delalloc_release_space(inode, num_pages << PAGE_CACHE_SHIFT); -- cgit v1.2.3 From 0d10ee2e6deb5c8409ae65b970846344897d5e4e Mon Sep 17 00:00:00 2001 From: Josef Bacik Date: Mon, 1 Aug 2011 14:37:36 -0400 Subject: Btrfs: don't call writepages from within write_full_page When doing a writepage we call writepages to try and write out any other dirty pages in the area. This could cause problems where we commit a transaction and then have somebody else dirtying metadata in the area as we could end up writing out a lot more than we care about, which could cause latency on anybody who is waiting for the transaction to completely finish committing. Thanks, Signed-off-by: Josef Bacik Signed-off-by: Chris Mason --- fs/btrfs/extent_io.c | 10 ---------- 1 file changed, 10 deletions(-) (limited to 'fs') diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index a59ebc608cc..8491712b1da 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -2502,7 +2502,6 @@ int extent_write_full_page(struct extent_io_tree *tree, struct page *page, struct writeback_control *wbc) { int ret; - struct address_space *mapping = page->mapping; struct extent_page_data epd = { .bio = NULL, .tree = tree, @@ -2510,18 +2509,9 @@ int extent_write_full_page(struct extent_io_tree *tree, struct page *page, .extent_locked = 0, .sync_io = wbc->sync_mode == WB_SYNC_ALL, }; - struct writeback_control wbc_writepages = { - .sync_mode = wbc->sync_mode, - .older_than_this = NULL, - .nr_to_write = 64, - .range_start = page_offset(page) + PAGE_CACHE_SIZE, - .range_end = (loff_t)-1, - }; ret = __extent_writepage(page, wbc, &epd); - extent_write_cache_pages(tree, mapping, &wbc_writepages, - __extent_writepage, &epd, flush_write_bio); flush_epd_write_bio(&epd); return ret; } -- cgit v1.2.3