From 0956c798ef8dbe0fc215870eb68bd2d8e789f86a Mon Sep 17 00:00:00 2001 From: Andi Kleen Date: Wed, 18 May 2011 00:11:22 +0000 Subject: BTRFS: Remove unused node_lock 240f62c8756 replaced the node_lock with rcu_read_lock, but forgot to remove the actual lock in the data structure. Remove it here. Signed-off-by: Andi Kleen Signed-off-by: Chris Mason --- fs/btrfs/ctree.h | 3 --- fs/btrfs/disk-io.c | 1 - 2 files changed, 4 deletions(-) (limited to 'fs/btrfs') diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index 8f4b81de3ae2..f290b98e2fe6 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -1088,9 +1088,6 @@ struct btrfs_fs_info { struct btrfs_root { struct extent_buffer *node; - /* the node lock is held while changing the node pointer */ - spinlock_t node_lock; - struct extent_buffer *commit_root; struct btrfs_root *log_root; struct btrfs_root *reloc_root; diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 228cf36ece83..64b289690f9d 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -1064,7 +1064,6 @@ static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize, INIT_LIST_HEAD(&root->dirty_list); INIT_LIST_HEAD(&root->orphan_list); INIT_LIST_HEAD(&root->root_list); - spin_lock_init(&root->node_lock); spin_lock_init(&root->orphan_lock); spin_lock_init(&root->inode_lock); spin_lock_init(&root->accounting_lock); -- cgit v1.2.2 From e2156867159ae7b3bc38ef1c26ea0ee30a895ef8 Mon Sep 17 00:00:00 2001 From: Hugo Mills Date: Sat, 14 May 2011 17:43:41 +0000 Subject: btrfs: Ensure the tree search ioctl returns the right number of records Btrfs's tree search ioctl has a field to indicate that no more than a given number of records should be returned. The ioctl doesn't honour this, as the tested value is not incremented until the end of the copy_to_sk function. This patch removes an unnecessary local variable, and updates the num_found counter as each key is found in the tree. Signed-off-by: Hugo Mills Signed-off-by: Chris Mason --- fs/btrfs/ioctl.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) (limited to 'fs/btrfs') diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 2616f7ed4799..ce773fb736a1 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -1279,7 +1279,6 @@ static noinline int copy_to_sk(struct btrfs_root *root, int nritems; int i; int slot; - int found = 0; int ret = 0; leaf = path->nodes[0]; @@ -1326,7 +1325,7 @@ static noinline int copy_to_sk(struct btrfs_root *root, item_off, item_len); *sk_offset += item_len; } - found++; + (*num_found)++; if (*num_found >= sk->nr_items) break; @@ -1345,7 +1344,6 @@ advance_key: } else ret = 1; overflow: - *num_found += found; return ret; } -- cgit v1.2.2 From 0f3b708c11914b684d17fed975eed19db902a8de Mon Sep 17 00:00:00 2001 From: Jamey Sharp Date: Thu, 5 May 2011 19:03:46 +0000 Subject: btrfs: Delete unused version.sh script. In 2008, commit b4f6c45dfbf84f47c21f73f6370ad1292b0627fd dropped the use of fs/btrfs/version.sh, but left the script behind. Kill it. Commit by Jamey Sharp and Josh Triplett. Signed-off-by: Jamey Sharp Signed-off-by: Josh Triplett Cc: Chris Mason Signed-off-by: Chris Mason --- fs/btrfs/version.sh | 43 ------------------------------------------- 1 file changed, 43 deletions(-) delete mode 100644 fs/btrfs/version.sh (limited to 'fs/btrfs') diff --git a/fs/btrfs/version.sh b/fs/btrfs/version.sh deleted file mode 100644 index 1ca1952fd917..000000000000 --- a/fs/btrfs/version.sh +++ /dev/null @@ -1,43 +0,0 @@ -#!/bin/bash -# -# determine-version -- report a useful version for releases -# -# Copyright 2008, Aron Griffis -# Copyright 2008, Oracle -# Released under the GNU GPLv2 - -v="v0.16" - -which git &> /dev/null -if [ $? == 0 ]; then - git branch >& /dev/null - if [ $? == 0 ]; then - if head=`git rev-parse --verify HEAD 2>/dev/null`; then - if tag=`git describe --tags 2>/dev/null`; then - v="$tag" - fi - - # Are there uncommitted changes? - git update-index --refresh --unmerged > /dev/null - if git diff-index --name-only HEAD | \ - grep -v "^scripts/package" \ - | read dummy; then - v="$v"-dirty - fi - fi - fi -fi - -echo "#ifndef __BUILD_VERSION" > .build-version.h -echo "#define __BUILD_VERSION" >> .build-version.h -echo "#define BTRFS_BUILD_VERSION \"Btrfs $v\"" >> .build-version.h -echo "#endif" >> .build-version.h - -diff -q version.h .build-version.h >& /dev/null - -if [ $? == 0 ]; then - rm .build-version.h - exit 0 -fi - -mv .build-version.h version.h -- cgit v1.2.2 From c4f675cd40d955d539180506c09515c90169b15b Mon Sep 17 00:00:00 2001 From: Sergei Trofimovich Date: Fri, 20 May 2011 20:20:30 +0000 Subject: btrfs: don't spin in shrink_delalloc if there is nothing to free Observed as a large delay when --mixed filesystem is filled up. Test example: 1. create tiny --mixed FS: $ dd if=/dev/zero of=2G.img seek=$((2048 * 1024 * 1024 - 1)) count=1 bs=1 $ mkfs.btrfs --mixed 2G.img $ mount -oloop 2G.img /mnt/ut/ 2. Try to fill it up: $ dd if=/dev/urandom of=10M.file bs=10240 count=1024 $ seq 1 256 | while read file_no; do echo $file_no; time cp 10M.file ${file_no}.copy; done Up to '200.copy' it goes fast, but when disk fills-up each -ENOSPC message takes 3 seconds to pop-up _every_ ENOSPC (and in usermode linux it's even more: 30-60 seconds!). (Maybe, time depends on kernel's timer resolution). No IO, no CPU load, just rescheduling. Some debugging revealed busy spinning in shrink_delalloc. Signed-off-by: Sergei Trofimovich Reviewed-by: Josef Bacik Signed-off-by: Chris Mason --- fs/btrfs/extent-tree.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'fs/btrfs') diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 9ee6bd55e16c..9f5fdd37451d 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -3425,6 +3425,10 @@ static int shrink_delalloc(struct btrfs_trans_handle *trans, if (reserved == 0) return 0; + /* nothing to shrink - nothing to reclaim */ + if (root->fs_info->delalloc_bytes == 0) + return 0; + max_reclaim = min(reserved, to_reclaim); while (loops < 1024) { -- cgit v1.2.2 From 9694b3fcbb0f5dd498fdf53c82f22fcc37989152 Mon Sep 17 00:00:00 2001 From: Sergei Trofimovich Date: Fri, 20 May 2011 20:20:31 +0000 Subject: btrfs: typo: 'btrfS' -> 'btrfs' Signed-off-by: Sergei Trofimovich Signed-off-by: Chris Mason --- fs/btrfs/dir-item.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'fs/btrfs') diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c index c62f02f6ae69..dec93485d539 100644 --- a/fs/btrfs/dir-item.c +++ b/fs/btrfs/dir-item.c @@ -452,7 +452,7 @@ int verify_dir_item(struct btrfs_root *root, namelen = XATTR_NAME_MAX; if (btrfs_dir_name_len(leaf, dir_item) > namelen) { - printk(KERN_CRIT "btrfS: invalid dir item name len: %u\n", + printk(KERN_CRIT "btrfs: invalid dir item name len: %u\n", (unsigned)btrfs_dir_data_len(leaf, dir_item)); return 1; } -- cgit v1.2.2 From 27160b6b5a1744b6eaa8416e2b901ec937b1eee0 Mon Sep 17 00:00:00 2001 From: Sergei Trofimovich Date: Fri, 20 May 2011 20:20:32 +0000 Subject: btrfs: fix typo 'testeing' -> 'testing' Signed-off-by: Sergei Trofimovich Signed-off-by: Chris Mason --- fs/btrfs/inode.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'fs/btrfs') diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 7cd8ab0ef04d..72650ceb9829 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -1310,7 +1310,7 @@ static int btrfs_set_bit_hook(struct inode *inode, /* * set_bit and clear bit hooks normally require _irqsave/restore - * but in this case, we are only testeing for the DELALLOC + * but in this case, we are only testing for the DELALLOC * bit, which is only set or cleared with irqs on */ if (!(state->state & EXTENT_DELALLOC) && (*bits & EXTENT_DELALLOC)) { @@ -1344,7 +1344,7 @@ static int btrfs_clear_bit_hook(struct inode *inode, { /* * set_bit and clear bit hooks normally require _irqsave/restore - * but in this case, we are only testeing for the DELALLOC + * but in this case, we are only testing for the DELALLOC * bit, which is only set or cleared with irqs on */ if ((state->state & EXTENT_DELALLOC) && (*bits & EXTENT_DELALLOC)) { -- cgit v1.2.2 From b0b802d7e34b0b4a78f911c3a8aad88aa91fd7ab Mon Sep 17 00:00:00 2001 From: Tsutomu Itoh Date: Thu, 19 May 2011 07:03:42 +0000 Subject: Btrfs: return error code to caller when btrfs_previous_item fails The error code is returned instead of calling BUG_ON when btrfs_previous_item returns the error. Signed-off-by: Tsutomu Itoh Signed-off-by: Chris Mason --- fs/btrfs/volumes.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'fs/btrfs') diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index c7367ae5a3e6..e40cdd5b4669 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -949,14 +949,14 @@ static int btrfs_free_dev_extent(struct btrfs_trans_handle *trans, if (ret > 0) { ret = btrfs_previous_item(root, path, key.objectid, BTRFS_DEV_EXTENT_KEY); - BUG_ON(ret); + if (ret) + goto out; leaf = path->nodes[0]; btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); extent = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_extent); BUG_ON(found_key.offset > start || found_key.offset + btrfs_dev_extent_length(leaf, extent) < start); - ret = 0; } else if (ret == 0) { leaf = path->nodes[0]; extent = btrfs_item_ptr(leaf, path->slots[0], @@ -969,6 +969,7 @@ static int btrfs_free_dev_extent(struct btrfs_trans_handle *trans, ret = btrfs_del_item(trans, root, path); BUG_ON(ret); +out: btrfs_free_path(path); return ret; } -- cgit v1.2.2 From 65a246c5ffe3b487a001de025816326939e63362 Mon Sep 17 00:00:00 2001 From: Tsutomu Itoh Date: Thu, 19 May 2011 04:37:44 +0000 Subject: Btrfs: return error code to caller when btrfs_del_item fails The error code is returned instead of calling BUG_ON when btrfs_del_item returns the error. Signed-off-by: Tsutomu Itoh Signed-off-by: Chris Mason --- fs/btrfs/file-item.c | 10 ++++++---- fs/btrfs/root-tree.c | 6 +++++- fs/btrfs/tree-log.c | 10 +++++++--- fs/btrfs/volumes.c | 4 +--- 4 files changed, 19 insertions(+), 11 deletions(-) (limited to 'fs/btrfs') diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c index a6a9d4e8b491..6e7556aa02e8 100644 --- a/fs/btrfs/file-item.c +++ b/fs/btrfs/file-item.c @@ -551,10 +551,10 @@ int btrfs_del_csums(struct btrfs_trans_handle *trans, ret = btrfs_search_slot(trans, root, &key, path, -1, 1); if (ret > 0) { if (path->slots[0] == 0) - goto out; + break; path->slots[0]--; } else if (ret < 0) { - goto out; + break; } leaf = path->nodes[0]; @@ -579,7 +579,8 @@ int btrfs_del_csums(struct btrfs_trans_handle *trans, /* delete the entire item, it is inside our range */ if (key.offset >= bytenr && csum_end <= end_byte) { ret = btrfs_del_item(trans, root, path); - BUG_ON(ret); + if (ret) + goto out; if (key.offset == bytenr) break; } else if (key.offset < bytenr && csum_end > end_byte) { @@ -633,9 +634,10 @@ int btrfs_del_csums(struct btrfs_trans_handle *trans, } btrfs_release_path(root, path); } + ret = 0; out: btrfs_free_path(path); - return 0; + return ret; } int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans, diff --git a/fs/btrfs/root-tree.c b/fs/btrfs/root-tree.c index 6928bff62daa..2cf5f5142159 100644 --- a/fs/btrfs/root-tree.c +++ b/fs/btrfs/root-tree.c @@ -385,7 +385,10 @@ again: *sequence = btrfs_root_ref_sequence(leaf, ref); ret = btrfs_del_item(trans, tree_root, path); - BUG_ON(ret); + if (ret) { + err = ret; + goto out; + } } else err = -ENOENT; @@ -397,6 +400,7 @@ again: goto again; } +out: btrfs_free_path(path); return err; } diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c index f997ec0c1ba4..cf2baeb70462 100644 --- a/fs/btrfs/tree-log.c +++ b/fs/btrfs/tree-log.c @@ -1050,7 +1050,8 @@ static noinline int fixup_inode_link_counts(struct btrfs_trans_handle *trans, break; ret = btrfs_del_item(trans, root, path); - BUG_ON(ret); + if (ret) + goto out; btrfs_release_path(root, path); inode = read_one_inode(root, key.offset); @@ -1068,8 +1069,10 @@ static noinline int fixup_inode_link_counts(struct btrfs_trans_handle *trans, */ key.offset = (u64)-1; } + ret = 0; +out: btrfs_release_path(root, path); - return 0; + return ret; } @@ -2587,7 +2590,8 @@ static int drop_objectid_items(struct btrfs_trans_handle *trans, break; ret = btrfs_del_item(trans, log, path); - BUG_ON(ret); + if (ret) + break; btrfs_release_path(log, path); } btrfs_release_path(log, path); diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index e40cdd5b4669..deca1a0326ad 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -967,7 +967,6 @@ static int btrfs_free_dev_extent(struct btrfs_trans_handle *trans, if (device->bytes_used > 0) device->bytes_used -= btrfs_dev_extent_length(leaf, extent); ret = btrfs_del_item(trans, root, path); - BUG_ON(ret); out: btrfs_free_path(path); @@ -1770,10 +1769,9 @@ static int btrfs_free_chunk(struct btrfs_trans_handle *trans, BUG_ON(ret); ret = btrfs_del_item(trans, root, path); - BUG_ON(ret); btrfs_free_path(path); - return 0; + return ret; } static int btrfs_del_sys_chunk(struct btrfs_root *root, u64 chunk_objectid, u64 -- cgit v1.2.2 From 1cd307990d6e2b4965620e339a92e0d7ae853e13 Mon Sep 17 00:00:00 2001 From: Tsutomu Itoh Date: Thu, 19 May 2011 05:19:08 +0000 Subject: Btrfs: BUG_ON is deleted from the caller of btrfs_truncate_item & btrfs_extend_item Currently, btrfs_truncate_item and btrfs_extend_item returns only 0. So, the check by BUG_ON in the caller is unnecessary. Signed-off-by: Tsutomu Itoh Signed-off-by: Chris Mason --- fs/btrfs/ctree.c | 8 ++------ fs/btrfs/dir-item.c | 1 - fs/btrfs/extent-tree.c | 3 --- fs/btrfs/file-item.c | 3 --- fs/btrfs/inode-item.c | 2 -- fs/btrfs/inode.c | 1 - fs/btrfs/tree-log.c | 1 - 7 files changed, 2 insertions(+), 17 deletions(-) (limited to 'fs/btrfs') diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c index 84d7ca1fe0ba..6f1a59cc41ff 100644 --- a/fs/btrfs/ctree.c +++ b/fs/btrfs/ctree.c @@ -3216,7 +3216,6 @@ int btrfs_truncate_item(struct btrfs_trans_handle *trans, struct btrfs_path *path, u32 new_size, int from_end) { - int ret = 0; int slot; struct extent_buffer *leaf; struct btrfs_item *item; @@ -3314,12 +3313,11 @@ int btrfs_truncate_item(struct btrfs_trans_handle *trans, btrfs_set_item_size(leaf, item, new_size); btrfs_mark_buffer_dirty(leaf); - ret = 0; if (btrfs_leaf_free_space(root, leaf) < 0) { btrfs_print_leaf(root, leaf); BUG(); } - return ret; + return 0; } /* @@ -3329,7 +3327,6 @@ int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root *root, struct btrfs_path *path, u32 data_size) { - int ret = 0; int slot; struct extent_buffer *leaf; struct btrfs_item *item; @@ -3394,12 +3391,11 @@ int btrfs_extend_item(struct btrfs_trans_handle *trans, btrfs_set_item_size(leaf, item, old_size + data_size); btrfs_mark_buffer_dirty(leaf); - ret = 0; if (btrfs_leaf_free_space(root, leaf) < 0) { btrfs_print_leaf(root, leaf); BUG(); } - return ret; + return 0; } /* diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c index dec93485d539..dd421c48c353 100644 --- a/fs/btrfs/dir-item.c +++ b/fs/btrfs/dir-item.c @@ -50,7 +50,6 @@ static struct btrfs_dir_item *insert_with_overflow(struct btrfs_trans_handle if (di) return ERR_PTR(-EEXIST); ret = btrfs_extend_item(trans, root, path, data_size); - WARN_ON(ret > 0); } if (ret < 0) return ERR_PTR(ret); diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 9f5fdd37451d..103e141afeb3 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -947,7 +947,6 @@ static int convert_extent_item_v0(struct btrfs_trans_handle *trans, BUG_ON(ret); ret = btrfs_extend_item(trans, root, path, new_size); - BUG_ON(ret); leaf = path->nodes[0]; item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); @@ -1555,7 +1554,6 @@ int setup_inline_extent_backref(struct btrfs_trans_handle *trans, size = btrfs_extent_inline_ref_size(type); ret = btrfs_extend_item(trans, root, path, size); - BUG_ON(ret); ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); refs = btrfs_extent_refs(leaf, ei); @@ -1684,7 +1682,6 @@ int update_inline_extent_backref(struct btrfs_trans_handle *trans, end - ptr - size); item_size -= size; ret = btrfs_truncate_item(trans, root, path, item_size, 1); - BUG_ON(ret); } btrfs_mark_buffer_dirty(leaf); return 0; diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c index 6e7556aa02e8..fb9b02667e75 100644 --- a/fs/btrfs/file-item.c +++ b/fs/btrfs/file-item.c @@ -495,7 +495,6 @@ static noinline int truncate_one_csum(struct btrfs_trans_handle *trans, u32 new_size = (bytenr - key->offset) >> blocksize_bits; new_size *= csum_size; ret = btrfs_truncate_item(trans, root, path, new_size, 1); - BUG_ON(ret); } else if (key->offset >= bytenr && csum_end > end_byte && end_byte > key->offset) { /* @@ -508,7 +507,6 @@ static noinline int truncate_one_csum(struct btrfs_trans_handle *trans, new_size *= csum_size; ret = btrfs_truncate_item(trans, root, path, new_size, 0); - BUG_ON(ret); key->offset = end_byte; ret = btrfs_set_item_key_safe(trans, root, path, key); @@ -763,7 +761,6 @@ again: goto insert; ret = btrfs_extend_item(trans, root, path, diff); - BUG_ON(ret); goto csum; } diff --git a/fs/btrfs/inode-item.c b/fs/btrfs/inode-item.c index 64f1150bb48d..baa74f3db691 100644 --- a/fs/btrfs/inode-item.c +++ b/fs/btrfs/inode-item.c @@ -130,7 +130,6 @@ int btrfs_del_inode_ref(struct btrfs_trans_handle *trans, item_size - (ptr + sub_item_len - item_start)); ret = btrfs_truncate_item(trans, root, path, item_size - sub_item_len, 1); - BUG_ON(ret); out: btrfs_free_path(path); return ret; @@ -167,7 +166,6 @@ int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans, old_size = btrfs_item_size_nr(path->nodes[0], path->slots[0]); ret = btrfs_extend_item(trans, root, path, ins_len); - BUG_ON(ret); ref = btrfs_item_ptr(path->nodes[0], path->slots[0], struct btrfs_inode_ref); ref = (struct btrfs_inode_ref *)((unsigned long)ref + old_size); diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 72650ceb9829..e9e2b4778279 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -3428,7 +3428,6 @@ search_again: btrfs_file_extent_calc_inline_size(size); ret = btrfs_truncate_item(trans, root, path, size, 1); - BUG_ON(ret); } else if (root->ref_cows) { inode_sub_bytes(inode, item_end + 1 - found_key.offset); diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c index cf2baeb70462..0350147106d5 100644 --- a/fs/btrfs/tree-log.c +++ b/fs/btrfs/tree-log.c @@ -382,7 +382,6 @@ insert: } else if (found_size < item_size) { ret = btrfs_extend_item(trans, root, path, item_size - found_size); - BUG_ON(ret); } } else if (ret) { return ret; -- cgit v1.2.2 From c00e9493f1412621c8665a707d63e32b0768f572 Mon Sep 17 00:00:00 2001 From: Tsutomu Itoh Date: Thu, 28 Apr 2011 09:10:23 +0000 Subject: Btrfs: return error to caller if read_one_inode() fails When read_one_inode() fails, error code is returned to caller instead of BUG_ON(). Signed-off-by: Tsutomu Itoh Signed-off-by: Chris Mason --- fs/btrfs/tree-log.c | 24 ++++++++++++++++++------ 1 file changed, 18 insertions(+), 6 deletions(-) (limited to 'fs/btrfs') diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c index 0350147106d5..46b7b57650ab 100644 --- a/fs/btrfs/tree-log.c +++ b/fs/btrfs/tree-log.c @@ -677,7 +677,10 @@ static noinline int drop_one_dir_item(struct btrfs_trans_handle *trans, btrfs_release_path(root, path); inode = read_one_inode(root, location.objectid); - BUG_ON(!inode); + if (!inode) { + kfree(name); + return -EIO; + } ret = link_to_fixup_dir(trans, root, path, location.objectid); BUG_ON(ret); @@ -816,7 +819,10 @@ static noinline int add_inode_ref(struct btrfs_trans_handle *trans, return -ENOENT; inode = read_one_inode(root, key->objectid); - BUG_ON(!inode); + if (!inode) { + iput(dir); + return -EIO; + } ref_ptr = btrfs_item_ptr_offset(eb, slot); ref_end = ref_ptr + btrfs_item_size_nr(eb, slot); @@ -1054,7 +1060,8 @@ static noinline int fixup_inode_link_counts(struct btrfs_trans_handle *trans, btrfs_release_path(root, path); inode = read_one_inode(root, key.offset); - BUG_ON(!inode); + if (!inode) + return -EIO; ret = fixup_inode_link_count(trans, root, inode); BUG_ON(ret); @@ -1090,7 +1097,8 @@ static noinline int link_to_fixup_dir(struct btrfs_trans_handle *trans, struct inode *inode; inode = read_one_inode(root, objectid); - BUG_ON(!inode); + if (!inode) + return -EIO; key.objectid = BTRFS_TREE_LOG_FIXUP_OBJECTID; btrfs_set_key_type(&key, BTRFS_ORPHAN_ITEM_KEY); @@ -1177,7 +1185,8 @@ static noinline int replay_one_name(struct btrfs_trans_handle *trans, int ret; dir = read_one_inode(root, key->objectid); - BUG_ON(!dir); + if (!dir) + return -EIO; name_len = btrfs_dir_name_len(eb, di); name = kmalloc(name_len, GFP_NOFS); @@ -1433,7 +1442,10 @@ again: btrfs_release_path(root, path); btrfs_release_path(log, log_path); inode = read_one_inode(root, location.objectid); - BUG_ON(!inode); + if (!inode) { + kfree(name); + return -EIO; + } ret = link_to_fixup_dir(trans, root, path, location.objectid); -- cgit v1.2.2 From 37daa4f968e9470ae9f30e246a5781717c598271 Mon Sep 17 00:00:00 2001 From: Tsutomu Itoh Date: Thu, 28 Apr 2011 09:18:21 +0000 Subject: Btrfs: check return value of btrfs_inc_extent_ref() If return value of btrfs_inc_extent_ref() is not 0, BUG() is called. Signed-off-by: Tsutomu Itoh Signed-off-by: Chris Mason --- fs/btrfs/tree-log.c | 1 + 1 file changed, 1 insertion(+) (limited to 'fs/btrfs') diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c index 46b7b57650ab..c2d887566400 100644 --- a/fs/btrfs/tree-log.c +++ b/fs/btrfs/tree-log.c @@ -589,6 +589,7 @@ static noinline int replay_one_extent(struct btrfs_trans_handle *trans, ins.objectid, ins.offset, 0, root->root_key.objectid, key->objectid, offset); + BUG_ON(ret); } else { /* * insert the extent pointer in the extent -- cgit v1.2.2 From b083916638eee513be501f53b42a4be0b9851db0 Mon Sep 17 00:00:00 2001 From: Julia Lawall Date: Sat, 14 May 2011 07:10:51 +0000 Subject: fs/btrfs: Add missing btrfs_free_path Btrfs_alloc_path should be matched with btrfs_free_path in error-handling code. A simplified version of the semantic match that finds this problem is as follows: (http://coccinelle.lip6.fr/) // @r exists@ local idexpression struct btrfs_path * x; expression ra,rb; position p1,p2; @@ x = btrfs_alloc_path@p1(...) ... when != btrfs_free_path(x,...) when != if (...) { ... btrfs_free_path(x,...) ...} when != x = ra if(...) { ... when != x = rb when forall when != btrfs_free_path(x,...) \(return <+...x...+>; \| return@p2...; \) } @script:python@ p1 << r.p1; p2 << r.p2; @@ cocci.print_main("alloc",p1) cocci.print_secs("return",p2) // Signed-off-by: Julia Lawall Signed-off-by: Chris Mason --- fs/btrfs/inode.c | 1 + fs/btrfs/super.c | 4 +++- 2 files changed, 4 insertions(+), 1 deletion(-) (limited to 'fs/btrfs') diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index e9e2b4778279..80fcd5177731 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -7314,6 +7314,7 @@ static int btrfs_symlink(struct inode *dir, struct dentry *dentry, datasize); if (err) { drop_inode = 1; + btrfs_free_path(path); goto out_unlock; } leaf = path->nodes[0]; diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index 0ac712efcdf2..46d7eed7e965 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -506,8 +506,10 @@ static struct dentry *get_default_root(struct super_block *sb, */ dir_id = btrfs_super_root_dir(&root->fs_info->super_copy); di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0); - if (IS_ERR(di)) + if (IS_ERR(di)) { + btrfs_free_path(path); return ERR_CAST(di); + } if (!di) { /* * Ok the default dir item isn't there. This is weird since -- cgit v1.2.2 From 8233767a227ac5843f1023b88c7272a7b5058f5f Mon Sep 17 00:00:00 2001 From: Xiao Guangrong Date: Wed, 20 Apr 2011 06:44:57 +0000 Subject: Btrfs: allocate extent state and check the result properly It doesn't allocate extent_state and check the result properly: - in set_extent_bit, it doesn't allocate extent_state if the path is not allowed wait - in clear_extent_bit, it doesn't check the result after atomic-ly allocate, we trigger BUG_ON() if it's fail - if allocate fail, we trigger BUG_ON instead of returning -ENOMEM since the return value of clear_extent_bit() is ignored by many callers Signed-off-by: Xiao Guangrong Signed-off-by: Chris Mason --- fs/btrfs/extent_io.c | 34 ++++++++++++++++++++++++++-------- 1 file changed, 26 insertions(+), 8 deletions(-) (limited to 'fs/btrfs') diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index ba41da59e31b..9ccea86dd015 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -439,6 +439,15 @@ static int clear_state_bit(struct extent_io_tree *tree, return ret; } +static struct extent_state * +alloc_extent_state_atomic(struct extent_state *prealloc) +{ + if (!prealloc) + prealloc = alloc_extent_state(GFP_ATOMIC); + + return prealloc; +} + /* * clear some bits on a range in the tree. This may require splitting * or inserting elements in the tree, so the gfp mask is used to @@ -476,8 +485,7 @@ int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, again: if (!prealloc && (mask & __GFP_WAIT)) { prealloc = alloc_extent_state(mask); - if (!prealloc) - return -ENOMEM; + BUG_ON(!prealloc); } spin_lock(&tree->lock); @@ -529,8 +537,8 @@ hit_next: */ if (state->start < start) { - if (!prealloc) - prealloc = alloc_extent_state(GFP_ATOMIC); + prealloc = alloc_extent_state_atomic(prealloc); + BUG_ON(!prealloc); err = split_state(tree, state, prealloc, start); BUG_ON(err == -EEXIST); prealloc = NULL; @@ -551,8 +559,8 @@ hit_next: * on the first half */ if (state->start <= end && state->end > end) { - if (!prealloc) - prealloc = alloc_extent_state(GFP_ATOMIC); + prealloc = alloc_extent_state_atomic(prealloc); + BUG_ON(!prealloc); err = split_state(tree, state, prealloc, end + 1); BUG_ON(err == -EEXIST); if (wake) @@ -725,8 +733,7 @@ int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, again: if (!prealloc && (mask & __GFP_WAIT)) { prealloc = alloc_extent_state(mask); - if (!prealloc) - return -ENOMEM; + BUG_ON(!prealloc); } spin_lock(&tree->lock); @@ -743,6 +750,8 @@ again: */ node = tree_search(tree, start); if (!node) { + prealloc = alloc_extent_state_atomic(prealloc); + BUG_ON(!prealloc); err = insert_state(tree, prealloc, start, end, &bits); prealloc = NULL; BUG_ON(err == -EEXIST); @@ -811,6 +820,9 @@ hit_next: err = -EEXIST; goto out; } + + prealloc = alloc_extent_state_atomic(prealloc); + BUG_ON(!prealloc); err = split_state(tree, state, prealloc, start); BUG_ON(err == -EEXIST); prealloc = NULL; @@ -841,6 +853,9 @@ hit_next: this_end = end; else this_end = last_start - 1; + + prealloc = alloc_extent_state_atomic(prealloc); + BUG_ON(!prealloc); err = insert_state(tree, prealloc, start, this_end, &bits); BUG_ON(err == -EEXIST); @@ -865,6 +880,9 @@ hit_next: err = -EEXIST; goto out; } + + prealloc = alloc_extent_state_atomic(prealloc); + BUG_ON(!prealloc); err = split_state(tree, state, prealloc, end + 1); BUG_ON(err == -EEXIST); -- cgit v1.2.2 From c7f895a2b2d1a002810d52e7b6653c9dc2fd0b0b Mon Sep 17 00:00:00 2001 From: Xiao Guangrong Date: Wed, 20 Apr 2011 06:45:49 +0000 Subject: Btrfs: fix unsafe usage of merge_state merge_state can free the current state if it can be merged with the next node, but in set_extent_bit(), after merge_state, we still use the current extent to get the next node and cache it into cached_state Signed-off-by: Xiao Guangrong Signed-off-by: Chris Mason --- fs/btrfs/extent_io.c | 22 ++++++++++++++-------- 1 file changed, 14 insertions(+), 8 deletions(-) (limited to 'fs/btrfs') diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 9ccea86dd015..ebfff5b44752 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -780,20 +780,18 @@ hit_next: if (err) goto out; + next_node = rb_next(node); cache_state(state, cached_state); merge_state(tree, state); if (last_end == (u64)-1) goto out; start = last_end + 1; - if (start < end && prealloc && !need_resched()) { - next_node = rb_next(node); - if (next_node) { - state = rb_entry(next_node, struct extent_state, - rb_node); - if (state->start == start) - goto hit_next; - } + if (next_node && start < end && prealloc && !need_resched()) { + state = rb_entry(next_node, struct extent_state, + rb_node); + if (state->start == start) + goto hit_next; } goto search_again; } @@ -856,14 +854,22 @@ hit_next: prealloc = alloc_extent_state_atomic(prealloc); BUG_ON(!prealloc); + + /* + * Avoid to free 'prealloc' if it can be merged with + * the later extent. + */ + atomic_inc(&prealloc->refs); err = insert_state(tree, prealloc, start, this_end, &bits); BUG_ON(err == -EEXIST); if (err) { + free_extent_state(prealloc); prealloc = NULL; goto out; } cache_state(prealloc, cached_state); + free_extent_state(prealloc); prealloc = NULL; start = this_end + 1; goto search_again; -- cgit v1.2.2 From 4f6c9328c6c0d8558907f16579a9d47815abef80 Mon Sep 17 00:00:00 2001 From: Xiao Guangrong Date: Wed, 20 Apr 2011 10:06:40 +0000 Subject: Btrfs: fix bh leak on __btrfs_open_devices path 'bh' is forgot to release if no error is detected Signed-off-by: Xiao Guangrong Signed-off-by: Chris Mason --- fs/btrfs/volumes.c | 1 + 1 file changed, 1 insertion(+) (limited to 'fs/btrfs') diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index deca1a0326ad..290100fc47be 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -597,6 +597,7 @@ static int __btrfs_open_devices(struct btrfs_fs_devices *fs_devices, list_add(&device->dev_alloc_list, &fs_devices->alloc_list); } + brelse(bh); continue; error_brelse: -- cgit v1.2.2 From c9513edb0079f97749c2ac00c887a22c4ba44792 Mon Sep 17 00:00:00 2001 From: Xiao Guangrong Date: Wed, 20 Apr 2011 10:07:30 +0000 Subject: Btrfs: fix the race between reading and updating devices On btrfs_congested_fn and __unplug_io_fn paths, we should hold device_list_mutex to avoid remove/add device path to update fs_devices->devices On __btrfs_close_devices and btrfs_prepare_sprout paths, the devices in fs_devices->devices or fs_devices->devices is updated, so we should hold the mutex to avoid the reader side to reach them Signed-off-by: Xiao Guangrong Signed-off-by: Chris Mason --- fs/btrfs/disk-io.c | 2 ++ fs/btrfs/volumes.c | 7 +++++++ 2 files changed, 9 insertions(+) (limited to 'fs/btrfs') diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 64b289690f9d..4e53a4fc467f 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -1410,6 +1410,7 @@ static int btrfs_congested_fn(void *congested_data, int bdi_bits) struct btrfs_device *device; struct backing_dev_info *bdi; + mutex_lock(&info->fs_devices->device_list_mutex); list_for_each_entry(device, &info->fs_devices->devices, dev_list) { if (!device->bdev) continue; @@ -1419,6 +1420,7 @@ static int btrfs_congested_fn(void *congested_data, int bdi_bits) break; } } + mutex_unlock(&info->fs_devices->device_list_mutex); return ret; } diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 290100fc47be..43c4f09e441c 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -481,6 +481,7 @@ static int __btrfs_close_devices(struct btrfs_fs_devices *fs_devices) if (--fs_devices->opened > 0) return 0; + mutex_lock(&fs_devices->device_list_mutex); list_for_each_entry(device, &fs_devices->devices, dev_list) { if (device->bdev) { blkdev_put(device->bdev, device->mode); @@ -495,6 +496,8 @@ static int __btrfs_close_devices(struct btrfs_fs_devices *fs_devices) device->writeable = 0; device->in_fs_metadata = 0; } + mutex_unlock(&fs_devices->device_list_mutex); + WARN_ON(fs_devices->open_devices); WARN_ON(fs_devices->rw_devices); fs_devices->opened = 0; @@ -1415,7 +1418,11 @@ static int btrfs_prepare_sprout(struct btrfs_trans_handle *trans, INIT_LIST_HEAD(&seed_devices->devices); INIT_LIST_HEAD(&seed_devices->alloc_list); mutex_init(&seed_devices->device_list_mutex); + + mutex_lock(&root->fs_info->fs_devices->device_list_mutex); list_splice_init(&fs_devices->devices, &seed_devices->devices); + mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); + list_splice_init(&fs_devices->alloc_list, &seed_devices->alloc_list); list_for_each_entry(device, &seed_devices->devices, dev_list) { device->fs_devices = seed_devices; -- cgit v1.2.2 From 0c1daee085cff1395d1eba4ad6faff7810a594d8 Mon Sep 17 00:00:00 2001 From: Xiao Guangrong Date: Wed, 20 Apr 2011 10:08:16 +0000 Subject: Btrfs: fix the race between remove dev and alloc chunk On remove device path, it updates device->dev_alloc_list but does not hold chunk lock Signed-off-by: Xiao Guangrong Signed-off-by: Chris Mason --- fs/btrfs/volumes.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'fs/btrfs') diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 43c4f09e441c..ee197ec28547 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -1291,7 +1291,9 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path) } if (device->writeable) { + lock_chunks(root); list_del_init(&device->dev_alloc_list); + unlock_chunks(root); root->fs_info->fs_devices->rw_devices--; } @@ -1345,7 +1347,9 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path) } fs_devices->seed = device->fs_devices->seed; device->fs_devices->seed = NULL; + lock_chunks(root); __btrfs_close_devices(device->fs_devices); + unlock_chunks(root); free_fs_devices(device->fs_devices); } @@ -1377,8 +1381,10 @@ out: return ret; error_undo: if (device->writeable) { + lock_chunks(root); list_add(&device->dev_alloc_list, &root->fs_info->fs_devices->alloc_list); + unlock_chunks(root); root->fs_info->fs_devices->rw_devices++; } goto error_brelse; -- cgit v1.2.2 From 46224705656633466ca7dc71d81b3c0abc76cae4 Mon Sep 17 00:00:00 2001 From: Xiao Guangrong Date: Wed, 20 Apr 2011 10:08:47 +0000 Subject: Btrfs: drop unnecessary device lock Drop device_list_mutex for the reader side on clone_fs_devices and btrfs_rm_device pathes since the fs_info->volume_mutex can ensure the device list is not updated btrfs_close_extra_devices is the initialized path, we can not add or remove device at this time, so we can simply drop the mutex safely, like other initialized function does(add_missing_dev, __find_device, __btrfs_open_devices ...). Signed-off-by: Xiao Guangrong Signed-off-by: Chris Mason --- fs/btrfs/volumes.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) (limited to 'fs/btrfs') diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index ee197ec28547..0b5ca2737268 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -406,7 +406,7 @@ static struct btrfs_fs_devices *clone_fs_devices(struct btrfs_fs_devices *orig) fs_devices->latest_trans = orig->latest_trans; memcpy(fs_devices->fsid, orig->fsid, sizeof(fs_devices->fsid)); - mutex_lock(&orig->device_list_mutex); + /* We have held the volume lock, it is safe to get the devices. */ list_for_each_entry(orig_dev, &orig->devices, dev_list) { device = kzalloc(sizeof(*device), GFP_NOFS); if (!device) @@ -429,10 +429,8 @@ static struct btrfs_fs_devices *clone_fs_devices(struct btrfs_fs_devices *orig) device->fs_devices = fs_devices; fs_devices->num_devices++; } - mutex_unlock(&orig->device_list_mutex); return fs_devices; error: - mutex_unlock(&orig->device_list_mutex); free_fs_devices(fs_devices); return ERR_PTR(-ENOMEM); } @@ -443,7 +441,7 @@ int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices) mutex_lock(&uuid_mutex); again: - mutex_lock(&fs_devices->device_list_mutex); + /* This is the initialized path, it is safe to release the devices. */ list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) { if (device->in_fs_metadata) continue; @@ -463,7 +461,6 @@ again: kfree(device->name); kfree(device); } - mutex_unlock(&fs_devices->device_list_mutex); if (fs_devices->seed) { fs_devices = fs_devices->seed; @@ -1242,14 +1239,16 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path) device = NULL; devices = &root->fs_info->fs_devices->devices; - mutex_lock(&root->fs_info->fs_devices->device_list_mutex); + /* + * It is safe to read the devices since the volume_mutex + * is held. + */ list_for_each_entry(tmp, devices, dev_list) { if (tmp->in_fs_metadata && !tmp->bdev) { device = tmp; break; } } - mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); bdev = NULL; bh = NULL; disk_super = NULL; -- cgit v1.2.2 From 1f78160ce1b1b8e657e2248118c4d91f881763f0 Mon Sep 17 00:00:00 2001 From: Xiao Guangrong Date: Wed, 20 Apr 2011 10:09:16 +0000 Subject: Btrfs: using rcu lock in the reader side of devices list fs_devices->devices is only updated on remove and add device paths, so we can use rcu to protect it in the reader side Signed-off-by: Xiao Guangrong Signed-off-by: Chris Mason --- fs/btrfs/disk-io.c | 14 ++++----- fs/btrfs/ioctl.c | 7 +++-- fs/btrfs/volumes.c | 85 +++++++++++++++++++++++++++++++++++++----------------- fs/btrfs/volumes.h | 2 ++ 4 files changed, 72 insertions(+), 36 deletions(-) (limited to 'fs/btrfs') diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 4e53a4fc467f..deba3d9c8853 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -1410,8 +1410,8 @@ static int btrfs_congested_fn(void *congested_data, int bdi_bits) struct btrfs_device *device; struct backing_dev_info *bdi; - mutex_lock(&info->fs_devices->device_list_mutex); - list_for_each_entry(device, &info->fs_devices->devices, dev_list) { + rcu_read_lock(); + list_for_each_entry_rcu(device, &info->fs_devices->devices, dev_list) { if (!device->bdev) continue; bdi = blk_get_backing_dev_info(device->bdev); @@ -1420,7 +1420,7 @@ static int btrfs_congested_fn(void *congested_data, int bdi_bits) break; } } - mutex_unlock(&info->fs_devices->device_list_mutex); + rcu_read_unlock(); return ret; } @@ -2332,9 +2332,9 @@ int write_all_supers(struct btrfs_root *root, int max_mirrors) sb = &root->fs_info->super_for_commit; dev_item = &sb->dev_item; - mutex_lock(&root->fs_info->fs_devices->device_list_mutex); + rcu_read_lock(); head = &root->fs_info->fs_devices->devices; - list_for_each_entry(dev, head, dev_list) { + list_for_each_entry_rcu(dev, head, dev_list) { if (!dev->bdev) { total_errors++; continue; @@ -2367,7 +2367,7 @@ int write_all_supers(struct btrfs_root *root, int max_mirrors) } total_errors = 0; - list_for_each_entry(dev, head, dev_list) { + list_for_each_entry_rcu(dev, head, dev_list) { if (!dev->bdev) continue; if (!dev->in_fs_metadata || !dev->writeable) @@ -2377,7 +2377,7 @@ int write_all_supers(struct btrfs_root *root, int max_mirrors) if (ret) total_errors++; } - mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); + rcu_read_unlock(); if (total_errors > max_errors) { printk(KERN_ERR "btrfs: %d errors while writing supers\n", total_errors); diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index ce773fb736a1..0de71feb8e1c 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -281,8 +281,9 @@ static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg) if (!capable(CAP_SYS_ADMIN)) return -EPERM; - mutex_lock(&fs_info->fs_devices->device_list_mutex); - list_for_each_entry(device, &fs_info->fs_devices->devices, dev_list) { + rcu_read_lock(); + list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, + dev_list) { if (!device->bdev) continue; q = bdev_get_queue(device->bdev); @@ -292,7 +293,7 @@ static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg) minlen); } } - mutex_unlock(&fs_info->fs_devices->device_list_mutex); + rcu_read_unlock(); if (!num_devices) return -EOPNOTSUPP; diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 0b5ca2737268..e7844f8a347a 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -363,7 +363,7 @@ static noinline int device_list_add(const char *path, INIT_LIST_HEAD(&device->dev_alloc_list); mutex_lock(&fs_devices->device_list_mutex); - list_add(&device->dev_list, &fs_devices->devices); + list_add_rcu(&device->dev_list, &fs_devices->devices); mutex_unlock(&fs_devices->device_list_mutex); device->fs_devices = fs_devices; @@ -471,6 +471,29 @@ again: return 0; } +static void __free_device(struct work_struct *work) +{ + struct btrfs_device *device; + + device = container_of(work, struct btrfs_device, rcu_work); + + if (device->bdev) + blkdev_put(device->bdev, device->mode); + + kfree(device->name); + kfree(device); +} + +static void free_device(struct rcu_head *head) +{ + struct btrfs_device *device; + + device = container_of(head, struct btrfs_device, rcu); + + INIT_WORK(&device->rcu_work, __free_device); + schedule_work(&device->rcu_work); +} + static int __btrfs_close_devices(struct btrfs_fs_devices *fs_devices) { struct btrfs_device *device; @@ -480,18 +503,27 @@ static int __btrfs_close_devices(struct btrfs_fs_devices *fs_devices) mutex_lock(&fs_devices->device_list_mutex); list_for_each_entry(device, &fs_devices->devices, dev_list) { - if (device->bdev) { - blkdev_put(device->bdev, device->mode); + struct btrfs_device *new_device; + + if (device->bdev) fs_devices->open_devices--; - } + if (device->writeable) { list_del_init(&device->dev_alloc_list); fs_devices->rw_devices--; } - device->bdev = NULL; - device->writeable = 0; - device->in_fs_metadata = 0; + new_device = kmalloc(sizeof(*new_device), GFP_NOFS); + BUG_ON(!new_device); + memcpy(new_device, device, sizeof(*new_device)); + new_device->name = kstrdup(device->name, GFP_NOFS); + BUG_ON(!new_device->name); + new_device->bdev = NULL; + new_device->writeable = 0; + new_device->in_fs_metadata = 0; + list_replace_rcu(&device->dev_list, &new_device->dev_list); + + call_rcu(&device->rcu, free_device); } mutex_unlock(&fs_devices->device_list_mutex); @@ -1204,11 +1236,13 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path) struct block_device *bdev; struct buffer_head *bh = NULL; struct btrfs_super_block *disk_super; + struct btrfs_fs_devices *cur_devices; u64 all_avail; u64 devid; u64 num_devices; u8 *dev_uuid; int ret = 0; + bool clear_super = false; mutex_lock(&uuid_mutex); mutex_lock(&root->fs_info->volume_mutex); @@ -1294,6 +1328,7 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path) list_del_init(&device->dev_alloc_list); unlock_chunks(root); root->fs_info->fs_devices->rw_devices--; + clear_super = true; } ret = btrfs_shrink_device(device, 0); @@ -1304,16 +1339,15 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path) if (ret) goto error_undo; - device->in_fs_metadata = 0; - /* * the device list mutex makes sure that we don't change * the device list while someone else is writing out all * the device supers. */ + + cur_devices = device->fs_devices; mutex_lock(&root->fs_info->fs_devices->device_list_mutex); - list_del_init(&device->dev_list); - mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); + list_del_rcu(&device->dev_list); device->fs_devices->num_devices--; @@ -1327,36 +1361,36 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path) if (device->bdev == root->fs_info->fs_devices->latest_bdev) root->fs_info->fs_devices->latest_bdev = next_device->bdev; - if (device->bdev) { - blkdev_put(device->bdev, device->mode); - device->bdev = NULL; + if (device->bdev) device->fs_devices->open_devices--; - } + + call_rcu(&device->rcu, free_device); + mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); num_devices = btrfs_super_num_devices(&root->fs_info->super_copy) - 1; btrfs_set_super_num_devices(&root->fs_info->super_copy, num_devices); - if (device->fs_devices->open_devices == 0) { + if (cur_devices->open_devices == 0) { struct btrfs_fs_devices *fs_devices; fs_devices = root->fs_info->fs_devices; while (fs_devices) { - if (fs_devices->seed == device->fs_devices) + if (fs_devices->seed == cur_devices) break; fs_devices = fs_devices->seed; } - fs_devices->seed = device->fs_devices->seed; - device->fs_devices->seed = NULL; + fs_devices->seed = cur_devices->seed; + cur_devices->seed = NULL; lock_chunks(root); - __btrfs_close_devices(device->fs_devices); + __btrfs_close_devices(cur_devices); unlock_chunks(root); - free_fs_devices(device->fs_devices); + free_fs_devices(cur_devices); } /* * at this point, the device is zero sized. We want to * remove it from the devices list and zero out the old super */ - if (device->writeable) { + if (clear_super) { /* make sure this device isn't detected as part of * the FS anymore */ @@ -1365,8 +1399,6 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path) sync_dirty_buffer(bh); } - kfree(device->name); - kfree(device); ret = 0; error_brelse: @@ -1425,7 +1457,8 @@ static int btrfs_prepare_sprout(struct btrfs_trans_handle *trans, mutex_init(&seed_devices->device_list_mutex); mutex_lock(&root->fs_info->fs_devices->device_list_mutex); - list_splice_init(&fs_devices->devices, &seed_devices->devices); + list_splice_init_rcu(&fs_devices->devices, &seed_devices->devices, + synchronize_rcu); mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); list_splice_init(&fs_devices->alloc_list, &seed_devices->alloc_list); @@ -1624,7 +1657,7 @@ int btrfs_init_new_device(struct btrfs_root *root, char *device_path) * half setup */ mutex_lock(&root->fs_info->fs_devices->device_list_mutex); - list_add(&device->dev_list, &root->fs_info->fs_devices->devices); + list_add_rcu(&device->dev_list, &root->fs_info->fs_devices->devices); list_add(&device->dev_alloc_list, &root->fs_info->fs_devices->alloc_list); root->fs_info->fs_devices->num_devices++; diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h index cc2eadaf7a27..f1b2e4f53fc2 100644 --- a/fs/btrfs/volumes.h +++ b/fs/btrfs/volumes.h @@ -86,6 +86,8 @@ struct btrfs_device { u8 uuid[BTRFS_UUID_SIZE]; struct btrfs_work work; + struct rcu_head rcu; + struct work_struct rcu_work; }; struct btrfs_fs_devices { -- cgit v1.2.2