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linux-sg2042/fs/btrfs/disk-io.h

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btrfs: replace GPL boilerplate by SPDX -- headers Remove GPL boilerplate text (long, short, one-line) and keep the rest, ie. personal, company or original source copyright statements. Add the SPDX header. Unify the include protection macros to match the file names. Signed-off-by: David Sterba <dsterba@suse.com>
2018-04-04 01:16:55 +08:00
/* SPDX-License-Identifier: GPL-2.0 */
Btrfs: add GPLv2 Signed-off-by: Chris Mason <chris.mason@oracle.com>
2007-06-12 21:07:21 +08:00
/*
* Copyright (C) 2007 Oracle. All rights reserved.
*/
btrfs: replace GPL boilerplate by SPDX -- headers Remove GPL boilerplate text (long, short, one-line) and keep the rest, ie. personal, company or original source copyright statements. Add the SPDX header. Unify the include protection macros to match the file names. Signed-off-by: David Sterba <dsterba@suse.com>
2018-04-04 01:16:55 +08:00
#ifndef BTRFS_DISK_IO_H
#define BTRFS_DISK_IO_H
Btrfs: Add backing store, memory management Signed-off-by: Chris Mason <chris.mason@oracle.com>
2007-02-02 22:18:22 +08:00
Btrfs: use linux/sizes.h to represent constants We use many constants to represent size and offset value. And to make code readable we use '256 * 1024 * 1024' instead of '268435456' to represent '256MB'. However we can make far more readable with 'SZ_256MB' which is defined in the 'linux/sizes.h'. So this patch replaces 'xxx * 1024 * 1024' kind of expression with single 'SZ_xxxMB' if 'xxx' is a power of 2 then 'xxx * SZ_1M' if 'xxx' is not a power of 2. And I haven't touched to '4096' & '8192' because it's more intuitive than 'SZ_4KB' & 'SZ_8KB'. Signed-off-by: Byongho Lee <bhlee.kernel@gmail.com> Signed-off-by: David Sterba <dsterba@suse.com>
2015-12-15 00:42:10 +08:00
#define BTRFS_SUPER_INFO_OFFSET SZ_64K
Btrfs: Write out all super blocks on commit, and bring back proper barrier support Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-04-11 04:19:33 +08:00
#define BTRFS_SUPER_INFO_SIZE 4096
Btrfs: superblock duplication This patch implements superblock duplication. Superblocks are stored at offset 16K, 64M and 256G on every devices. Spaces used by superblocks are preserved by the allocator, which uses a reverse mapping function to find the logical addresses that correspond to superblocks. Thank you, Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
2008-12-09 05:46:26 +08:00
#define BTRFS_SUPER_MIRROR_MAX 3
#define BTRFS_SUPER_MIRROR_SHIFT 12
btrfs: use named constant for bdev blocksize Superblock is read and written using buffer heads, we need to set the bdev blocksize. The magic constant has been hardcoded in several places, so replace it with a named constant. Signed-off-by: David Sterba <dsterba@suse.com>
2017-06-16 07:48:05 +08:00
/*
* Fixed blocksize for all devices, applies to specific ways of reading
* metadata like superblock. Must meet the set_blocksize requirements.
*
* Do not change.
*/
#define BTRFS_BDEV_BLOCKSIZE (4096)
btrfs: use enum for wq endio metadata type The enum exists but is not consistently used. Signed-off-by: David Sterba <dsterba@suse.cz>
2014-07-30 06:25:45 +08:00
enum btrfs_wq_endio_type {
btrfs: drop extra enum initialization where using defaults The first auto-assigned value to enum is 0, we can use that and not initialize all members where the auto-increment does the same. This is used for values that are not part of on-disk format. Reviewed-by: Omar Sandoval <osandov@fb.com> Reviewed-by: Qu Wenruo <wqu@suse.com> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Signed-off-by: David Sterba <dsterba@suse.com>
2018-11-27 22:25:13 +08:00
BTRFS_WQ_ENDIO_DATA,
BTRFS_WQ_ENDIO_METADATA,
BTRFS_WQ_ENDIO_FREE_SPACE,
BTRFS_WQ_ENDIO_RAID56,
Btrfs: RAID5 and RAID6 This builds on David Woodhouse's original Btrfs raid5/6 implementation. The code has changed quite a bit, blame Chris Mason for any bugs. Read/modify/write is done after the higher levels of the filesystem have prepared a given bio. This means the higher layers are not responsible for building full stripes, and they don't need to query for the topology of the extents that may get allocated during delayed allocation runs. It also means different files can easily share the same stripe. But, it does expose us to incorrect parity if we crash or lose power while doing a read/modify/write cycle. This will be addressed in a later commit. Scrub is unable to repair crc errors on raid5/6 chunks. Discard does not work on raid5/6 (yet) The stripe size is fixed at 64KiB per disk. This will be tunable in a later commit. Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2013-01-30 07:40:14 +08:00
};
Btrfs: superblock duplication This patch implements superblock duplication. Superblocks are stored at offset 16K, 64M and 256G on every devices. Spaces used by superblocks are preserved by the allocator, which uses a reverse mapping function to find the logical addresses that correspond to superblocks. Thank you, Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
2008-12-09 05:46:26 +08:00
static inline u64 btrfs_sb_offset(int mirror)
{
Btrfs: use linux/sizes.h to represent constants We use many constants to represent size and offset value. And to make code readable we use '256 * 1024 * 1024' instead of '268435456' to represent '256MB'. However we can make far more readable with 'SZ_256MB' which is defined in the 'linux/sizes.h'. So this patch replaces 'xxx * 1024 * 1024' kind of expression with single 'SZ_xxxMB' if 'xxx' is a power of 2 then 'xxx * SZ_1M' if 'xxx' is not a power of 2. And I haven't touched to '4096' & '8192' because it's more intuitive than 'SZ_4KB' & 'SZ_8KB'. Signed-off-by: Byongho Lee <bhlee.kernel@gmail.com> Signed-off-by: David Sterba <dsterba@suse.com>
2015-12-15 00:42:10 +08:00
u64 start = SZ_16K;
Btrfs: superblock duplication This patch implements superblock duplication. Superblocks are stored at offset 16K, 64M and 256G on every devices. Spaces used by superblocks are preserved by the allocator, which uses a reverse mapping function to find the logical addresses that correspond to superblocks. Thank you, Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
2008-12-09 05:46:26 +08:00
if (mirror)
return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror);
return BTRFS_SUPER_INFO_OFFSET;
}
Btrfs: Add support for multiple devices per filesystem Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-03-25 03:01:56 +08:00
struct btrfs_device;
Btrfs: Add support for device scanning and detection ioctls Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-03-25 03:02:07 +08:00
struct btrfs_fs_devices;
Mountable btrfs, with readdir Signed-off-by: Chris Mason <chris.mason@oracle.com>
2007-03-23 00:13:20 +08:00
btrfs: add a leak check for roots Now that we're going to start relying on getting ref counting right for roots, add a list to track allocated roots and print out any roots that aren't freed up at free_fs_info time. Hide this behind CONFIG_BTRFS_DEBUG because this will just be used for developers to verify they aren't breaking things. Reviewed-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: Josef Bacik <josef@toxicpanda.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2020-01-24 22:33:00 +08:00
void btrfs_check_leaked_roots(struct btrfs_fs_info *fs_info);
btrfs: make the init of static elements in fs_info separate In adding things like eb leak checking and root leak checking there were a lot of weird corner cases that come from the fact that 1) We do not init the fs_info until we get to open_ctree time in the normal case and 2) The test infrastructure half-init's the fs_info for things that it needs. This makes it really annoying to make changes because you have to add init in two different places, have special cases for testing fs_info's that may not have certain things initialized, and cases for fs_info's that didn't make it to open_ctree and thus are not fully set up. Fix this by extracting out the non-allocating init of the fs info into it's own public function and use that to make sure we're all getting consistent views of an allocated fs_info. Signed-off-by: Josef Bacik <josef@toxicpanda.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2020-01-24 22:32:59 +08:00
void btrfs_init_fs_info(struct btrfs_fs_info *fs_info);
btrfs: get fs_info from eb in btrfs_verify_level_key We can read fs_info from extent buffer and can drop it from the parameters. Signed-off-by: David Sterba <dsterba@suse.com>
2019-03-20 21:58:13 +08:00
int btrfs_verify_level_key(struct extent_buffer *eb, int level,
btrfs: Check the first key and level for cached extent buffer [BUG] When reading a file from a fuzzed image, kernel can panic like: BTRFS warning (device loop0): csum failed root 5 ino 270 off 0 csum 0x98f94189 expected csum 0x00000000 mirror 1 assertion failed: !memcmp_extent_buffer(b, &disk_key, offsetof(struct btrfs_leaf, items[0].key), sizeof(disk_key)), file: fs/btrfs/ctree.c, line: 2544 ------------[ cut here ]------------ kernel BUG at fs/btrfs/ctree.h:3500! invalid opcode: 0000 [#1] PREEMPT SMP NOPTI RIP: 0010:btrfs_search_slot.cold.24+0x61/0x63 [btrfs] Call Trace: btrfs_lookup_csum+0x52/0x150 [btrfs] __btrfs_lookup_bio_sums+0x209/0x640 [btrfs] btrfs_submit_bio_hook+0x103/0x170 [btrfs] submit_one_bio+0x59/0x80 [btrfs] extent_read_full_page+0x58/0x80 [btrfs] generic_file_read_iter+0x2f6/0x9d0 __vfs_read+0x14d/0x1a0 vfs_read+0x8d/0x140 ksys_read+0x52/0xc0 do_syscall_64+0x60/0x210 entry_SYSCALL_64_after_hwframe+0x49/0xbe [CAUSE] The fuzzed image has a corrupted leaf whose first key doesn't match its parent: checksum tree key (CSUM_TREE ROOT_ITEM 0) node 29741056 level 1 items 14 free 107 generation 19 owner CSUM_TREE fs uuid 3381d111-94a3-4ac7-8f39-611bbbdab7e6 chunk uuid 9af1c3c7-2af5-488b-8553-530bd515f14c ... key (EXTENT_CSUM EXTENT_CSUM 79691776) block 29761536 gen 19 leaf 29761536 items 1 free space 1726 generation 19 owner CSUM_TREE leaf 29761536 flags 0x1(WRITTEN) backref revision 1 fs uuid 3381d111-94a3-4ac7-8f39-611bbbdab7e6 chunk uuid 9af1c3c7-2af5-488b-8553-530bd515f14c item 0 key (EXTENT_CSUM EXTENT_CSUM 8798638964736) itemoff 1751 itemsize 2244 range start 8798638964736 end 8798641262592 length 2297856 When reading the above tree block, we have extent_buffer->refs = 2 in the context: - initial one from __alloc_extent_buffer() alloc_extent_buffer() |- __alloc_extent_buffer() |- atomic_set(&eb->refs, 1) - one being added to fs_info->buffer_radix alloc_extent_buffer() |- check_buffer_tree_ref() |- atomic_inc(&eb->refs) So if even we call free_extent_buffer() in read_tree_block or other similar situation, we only decrease the refs by 1, it doesn't reach 0 and won't be freed right now. The staled eb and its corrupted content will still be kept cached. Furthermore, we have several extra cases where we either don't do first key check or the check is not proper for all callers: - scrub We just don't have first key in this context. - shared tree block One tree block can be shared by several snapshot/subvolume trees. In that case, the first key check for one subvolume doesn't apply to another. So for the above reasons, a corrupted extent buffer can sneak into the buffer cache. [FIX] Call verify_level_key in read_block_for_search to do another verification. For that purpose the function is exported. Due to above reasons, although we can free corrupted extent buffer from cache, we still need the check in read_block_for_search(), for scrub and shared tree blocks. Link: https://bugzilla.kernel.org/show_bug.cgi?id=202755 Link: https://bugzilla.kernel.org/show_bug.cgi?id=202757 Link: https://bugzilla.kernel.org/show_bug.cgi?id=202759 Link: https://bugzilla.kernel.org/show_bug.cgi?id=202761 Link: https://bugzilla.kernel.org/show_bug.cgi?id=202767 Link: https://bugzilla.kernel.org/show_bug.cgi?id=202769 Reported-by: Yoon Jungyeon <jungyeon@gatech.edu> CC: stable@vger.kernel.org # 4.19+ Signed-off-by: Qu Wenruo <wqu@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2019-03-12 17:10:40 +08:00
struct btrfs_key *first_key, u64 parent_transid);
btrfs: Validate child tree block's level and first key We have several reports about node pointer points to incorrect child tree blocks, which could have even wrong owner and level but still with valid generation and checksum. Although btrfs check could handle it and print error message like: leaf parent key incorrect 60670574592 Kernel doesn't have enough check on this type of corruption correctly. At least add such check to read_tree_block() and btrfs_read_buffer(), where we need two new parameters @level and @first_key to verify the child tree block. The new @level check is mandatory and all call sites are already modified to extract expected level from its call chain. While @first_key is optional, the following call sites are skipping such check: 1) Root node/leaf As ROOT_ITEM doesn't contain the first key, skip @first_key check. 2) Direct backref Only parent bytenr and level is known and we need to resolve the key all by ourselves, skip @first_key check. Another note of this verification is, it needs extra info from nodeptr or ROOT_ITEM, so it can't fit into current tree-checker framework, which is limited to node/leaf boundary. Signed-off-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2018-03-29 09:08:11 +08:00
struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
u64 parent_transid, int level,
struct btrfs_key *first_key);
btrfs: take an fs_info directly when the root is not used otherwise There are loads of functions in btrfs that accept a root parameter but only use it to obtain an fs_info pointer. Let's convert those to just accept an fs_info pointer directly. Signed-off-by: Jeff Mahoney <jeffm@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2016-06-23 06:54:24 +08:00
void readahead_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr);
struct extent_buffer *btrfs_find_create_tree_block(
struct btrfs_fs_info *fs_info,
u64 bytenr);
btrfs: get fs_info from eb in clean_tree_block We can read fs_info from extent buffer and can drop it from the parameters. Signed-off-by: David Sterba <dsterba@suse.com>
2019-03-20 21:30:02 +08:00
void btrfs_clean_tree_block(struct extent_buffer *buf);
btrfs: add __cold attribute to more functions The attribute can mark functions supposed to be called rarely if at all and the text can be moved to sections far from the other code. The attribute has been added to several functions already, this patch is based on hints given by gcc -Wsuggest-attribute=cold. The net effect of this patch is decrease of btrfs.ko by 1000-1300, depending on the config options. Reviewed-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2019-10-02 01:57:35 +08:00
int __cold open_ctree(struct super_block *sb,
btrfs: make open_ctree() return int It returns either ERR_PTR(-ve) or sb->s_fs_info. The latter can be found by caller just as well, TYVM, no need to return it. Just return -ve or 0... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-11-17 14:10:02 +08:00
struct btrfs_fs_devices *fs_devices,
char *options);
btrfs: add __cold attribute to more functions The attribute can mark functions supposed to be called rarely if at all and the text can be moved to sections far from the other code. The attribute has been added to several functions already, this patch is based on hints given by gcc -Wsuggest-attribute=cold. The net effect of this patch is decrease of btrfs.ko by 1000-1300, depending on the config options. Reviewed-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2019-10-02 01:57:35 +08:00
void __cold close_ctree(struct btrfs_fs_info *fs_info);
btrfs: merge two superblock writing helpers write_all_supers and write_ctree_super are almost equal, the parameter 'trans' is unused so we can drop it and have just one helper. Reviewed-by: Liu Bo <bo.li.liu@oracle.com> Signed-off-by: David Sterba <dsterba@suse.com>
2017-02-11 02:04:32 +08:00
int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors);
btrfs: use the page cache for super block reading Super-block reading in BTRFS is done using buffer_heads. Buffer_heads have some drawbacks, like not being able to propagate errors from the lower layers. Directly use the page cache for reading the super blocks from disk or invalidating an on-disk super block. We have to use the page cache so to avoid races between mkfs and udev. See also 6f60cbd3ae44 ("btrfs: access superblock via pagecache in scan_one_device"). This patch unwraps the buffer head API and does not change the way the super block is actually read. Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2020-02-13 23:24:32 +08:00
struct btrfs_super_block *btrfs_read_dev_super(struct block_device *bdev);
struct btrfs_super_block *btrfs_read_dev_one_super(struct block_device *bdev,
int copy_num);
btrfs: call functions that always use the same root with fs_info instead There are many functions that are always called with the same root argument. Rather than passing the same root every time, we can pass an fs_info pointer instead and have the function get the root pointer itself. Signed-off-by: Jeff Mahoney <jeffm@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2016-06-22 09:16:51 +08:00
int btrfs_commit_super(struct btrfs_fs_info *fs_info);
btrfs: export and use btrfs_read_tree_root for tree-log Tree-log uses btrfs_read_fs_root to load its log, but this just calls btrfs_read_tree_root. We don't save the log roots in our root cache, so just export this helper and use it in the logging code. Reviewed-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: Josef Bacik <josef@toxicpanda.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2020-01-24 22:32:21 +08:00
struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root,
struct btrfs_key *key);
Btrfs: cleanup the similar code of the fs root read There are several functions whose code is similar, such as btrfs_find_last_root() btrfs_read_fs_root_no_radix() Besides that, some functions are invoked twice, it is unnecessary, for example, we are sure that all roots which is found in btrfs_find_orphan_roots() have their orphan items, so it is unnecessary to check the orphan item again. So cleanup it. Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com>
2013-05-15 15:48:19 +08:00
int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
struct btrfs_root *root);
Btrfs: add sanity tests for new qgroup accounting code This exercises the various parts of the new qgroup accounting code. We do some basic stuff and do some things with the shared refs to make sure all that code works. I had to add a bunch of infrastructure because I needed to be able to insert items into a fake tree without having to do all the hard work myself, hopefully this will be usefull in the future. Thanks, Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Chris Mason <clm@fb.com>
2014-05-08 05:06:09 +08:00
void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info);
Btrfs: fix oops caused by the space balance and dead roots When doing space balance and subvolume destroy at the same time, we met the following oops: kernel BUG at fs/btrfs/relocation.c:2247! RIP: 0010: [<ffffffffa04cec16>] prepare_to_merge+0x154/0x1f0 [btrfs] Call Trace: [<ffffffffa04b5ab7>] relocate_block_group+0x466/0x4e6 [btrfs] [<ffffffffa04b5c7a>] btrfs_relocate_block_group+0x143/0x275 [btrfs] [<ffffffffa0495c56>] btrfs_relocate_chunk.isra.27+0x5c/0x5a2 [btrfs] [<ffffffffa0459871>] ? btrfs_item_key_to_cpu+0x15/0x31 [btrfs] [<ffffffffa048b46a>] ? btrfs_get_token_64+0x7e/0xcd [btrfs] [<ffffffffa04a3467>] ? btrfs_tree_read_unlock_blocking+0xb2/0xb7 [btrfs] [<ffffffffa049907d>] btrfs_balance+0x9c7/0xb6f [btrfs] [<ffffffffa049ef84>] btrfs_ioctl_balance+0x234/0x2ac [btrfs] [<ffffffffa04a1e8e>] btrfs_ioctl+0xd87/0x1ef9 [btrfs] [<ffffffff81122f53>] ? path_openat+0x234/0x4db [<ffffffff813c3b78>] ? __do_page_fault+0x31d/0x391 [<ffffffff810f8ab6>] ? vma_link+0x74/0x94 [<ffffffff811250f5>] vfs_ioctl+0x1d/0x39 [<ffffffff811258c8>] do_vfs_ioctl+0x32d/0x3e2 [<ffffffff811259d4>] SyS_ioctl+0x57/0x83 [<ffffffff813c3bfa>] ? do_page_fault+0xe/0x10 [<ffffffff813c73c2>] system_call_fastpath+0x16/0x1b It is because we returned the error number if the reference of the root was 0 when doing space relocation. It was not right here, because though the root was dead(refs == 0), but the space it held still need be relocated, or we could not remove the block group. So in this case, we should return the root no matter it is dead or not. Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2013-09-25 21:47:44 +08:00
struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
btrfs: simplify root lookup by id The main function to lookup a root by its id btrfs_get_fs_root takes the whole key, while only using the objectid. The value of offset is preset to (u64)-1 but not actually used until btrfs_find_root that does the actual search. Switch btrfs_get_fs_root to use only objectid and remove all local variables that existed just for the lookup. The actual key for search is set up in btrfs_get_fs_root, reusing another key variable. Signed-off-by: David Sterba <dsterba@suse.com>
2020-05-16 01:35:55 +08:00
u64 objectid, bool check_ref);
btrfs: preallocate anon block device at first phase of snapshot creation [BUG] When the anonymous block device pool is exhausted, subvolume/snapshot creation fails with EMFILE (Too many files open). This has been reported by a user. The allocation happens in the second phase during transaction commit where it's only way out is to abort the transaction BTRFS: Transaction aborted (error -24) WARNING: CPU: 17 PID: 17041 at fs/btrfs/transaction.c:1576 create_pending_snapshot+0xbc4/0xd10 [btrfs] RIP: 0010:create_pending_snapshot+0xbc4/0xd10 [btrfs] Call Trace: create_pending_snapshots+0x82/0xa0 [btrfs] btrfs_commit_transaction+0x275/0x8c0 [btrfs] btrfs_mksubvol+0x4b9/0x500 [btrfs] btrfs_ioctl_snap_create_transid+0x174/0x180 [btrfs] btrfs_ioctl_snap_create_v2+0x11c/0x180 [btrfs] btrfs_ioctl+0x11a4/0x2da0 [btrfs] do_vfs_ioctl+0xa9/0x640 ksys_ioctl+0x67/0x90 __x64_sys_ioctl+0x1a/0x20 do_syscall_64+0x5a/0x110 entry_SYSCALL_64_after_hwframe+0x44/0xa9 ---[ end trace 33f2f83f3d5250e9 ]--- BTRFS: error (device sda1) in create_pending_snapshot:1576: errno=-24 unknown BTRFS info (device sda1): forced readonly BTRFS warning (device sda1): Skipping commit of aborted transaction. BTRFS: error (device sda1) in cleanup_transaction:1831: errno=-24 unknown [CAUSE] When the global anonymous block device pool is exhausted, the following call chain will fail, and lead to transaction abort: btrfs_ioctl_snap_create_v2() |- btrfs_ioctl_snap_create_transid() |- btrfs_mksubvol() |- btrfs_commit_transaction() |- create_pending_snapshot() |- btrfs_get_fs_root() |- btrfs_init_fs_root() |- get_anon_bdev() [FIX] Although we can't enlarge the anonymous block device pool, at least we can preallocate anon_dev for subvolume/snapshot in the first phase, outside of transaction context and exactly at the moment the user calls the creation ioctl. Reported-by: Greed Rong <greedrong@gmail.com> Link: https://lore.kernel.org/linux-btrfs/CA+UqX+NTrZ6boGnWHhSeZmEY5J76CTqmYjO2S+=tHJX7nb9DPw@mail.gmail.com/ CC: stable@vger.kernel.org # 4.4+ Signed-off-by: Qu Wenruo <wqu@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2020-06-16 10:17:36 +08:00
struct btrfs_root *btrfs_get_new_fs_root(struct btrfs_fs_info *fs_info,
u64 objectid, dev_t anon_dev);
Btrfs: fix oops caused by the space balance and dead roots When doing space balance and subvolume destroy at the same time, we met the following oops: kernel BUG at fs/btrfs/relocation.c:2247! RIP: 0010: [<ffffffffa04cec16>] prepare_to_merge+0x154/0x1f0 [btrfs] Call Trace: [<ffffffffa04b5ab7>] relocate_block_group+0x466/0x4e6 [btrfs] [<ffffffffa04b5c7a>] btrfs_relocate_block_group+0x143/0x275 [btrfs] [<ffffffffa0495c56>] btrfs_relocate_chunk.isra.27+0x5c/0x5a2 [btrfs] [<ffffffffa0459871>] ? btrfs_item_key_to_cpu+0x15/0x31 [btrfs] [<ffffffffa048b46a>] ? btrfs_get_token_64+0x7e/0xcd [btrfs] [<ffffffffa04a3467>] ? btrfs_tree_read_unlock_blocking+0xb2/0xb7 [btrfs] [<ffffffffa049907d>] btrfs_balance+0x9c7/0xb6f [btrfs] [<ffffffffa049ef84>] btrfs_ioctl_balance+0x234/0x2ac [btrfs] [<ffffffffa04a1e8e>] btrfs_ioctl+0xd87/0x1ef9 [btrfs] [<ffffffff81122f53>] ? path_openat+0x234/0x4db [<ffffffff813c3b78>] ? __do_page_fault+0x31d/0x391 [<ffffffff810f8ab6>] ? vma_link+0x74/0x94 [<ffffffff811250f5>] vfs_ioctl+0x1d/0x39 [<ffffffff811258c8>] do_vfs_ioctl+0x32d/0x3e2 [<ffffffff811259d4>] SyS_ioctl+0x57/0x83 [<ffffffff813c3bfa>] ? do_page_fault+0xe/0x10 [<ffffffff813c73c2>] system_call_fastpath+0x16/0x1b It is because we returned the error number if the reference of the root was 0 when doing space relocation. It was not right here, because though the root was dead(refs == 0), but the space it held still need be relocated, or we could not remove the block group. So in this case, we should return the root no matter it is dead or not. Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2013-09-25 21:47:44 +08:00
btrfs: export and rename free_fs_info We're going to start freeing roots and doing other complicated things in free_fs_info, so we need to move it to disk-io.c and export it in order to use things lik btrfs_put_fs_root(). Reviewed-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: Josef Bacik <josef@toxicpanda.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2020-01-24 22:32:53 +08:00
void btrfs_free_fs_info(struct btrfs_fs_info *fs_info);
Btrfs: mount ro and remount support This patch adds mount ro and remount support. The main changes in patch are: adding btrfs_remount and related helper function; splitting the transaction related code out of close_ctree into btrfs_commit_super; updating allocator to properly handle read only block group. Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
2008-11-13 03:34:12 +08:00
int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);
btrfs: take an fs_info directly when the root is not used otherwise There are loads of functions in btrfs that accept a root parameter but only use it to obtain an fs_info pointer. Let's convert those to just accept an fs_info pointer directly. Signed-off-by: Jeff Mahoney <jeffm@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2016-06-23 06:54:24 +08:00
void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info);
void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info);
Btrfs: cleanup the similar code of the fs root read There are several functions whose code is similar, such as btrfs_find_last_root() btrfs_read_fs_root_no_radix() Besides that, some functions are invoked twice, it is unnecessary, for example, we are sure that all roots which is found in btrfs_find_orphan_roots() have their orphan items, so it is unnecessary to check the orphan item again. So cleanup it. Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com>
2013-05-15 15:48:19 +08:00
void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
struct btrfs_root *root);
Btrfs: introduce grab/put functions for the root of the fs/file tree The grab/put funtions will be used in the next patch, which need grab the root object and ensure it is not freed. We use reference counter instead of the srcu lock is to aovid blocking the memory reclaim task, which invokes synchronize_srcu(). Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com>
2013-05-15 15:48:20 +08:00
Btrfs: add a sanity test for btrfs_split_item While looking at somebodys corruption I became completely convinced that btrfs_split_item was broken, so I wrote this test to verify that it was working as it was supposed to. Thankfully it appears to be working as intended, so just add this test to make sure nobody breaks it in the future. Thanks, Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2013-09-20 04:07:01 +08:00
#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
btrfs: pull node/sector/stripe sizes out of root and into fs_info We track the node sizes per-root, but they never vary from the values in the superblock. This patch messes with the 80-column style a bit, but subsequent patches to factor out root->fs_info into a convenience variable fix it up again. Signed-off-by: Jeff Mahoney <jeffm@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2016-06-15 21:22:56 +08:00
struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info);
Btrfs: add a sanity test for btrfs_split_item While looking at somebodys corruption I became completely convinced that btrfs_split_item was broken, so I wrote this test to verify that it was working as it was supposed to. Thankfully it appears to be working as intended, so just add this test to make sure nobody breaks it in the future. Thanks, Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2013-09-20 04:07:01 +08:00
#endif
Btrfs: introduce grab/put functions for the root of the fs/file tree The grab/put funtions will be used in the next patch, which need grab the root object and ensure it is not freed. We use reference counter instead of the srcu lock is to aovid blocking the memory reclaim task, which invokes synchronize_srcu(). Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com>
2013-05-15 15:48:20 +08:00
/*
* This function is used to grab the root, and avoid it is freed when we
* access it. But it doesn't ensure that the tree is not dropped.
*
* If you want to ensure the whole tree is safe, you should use
* fs_info->subvol_srcu
*/
btrfs: rename btrfs_put_fs_root and btrfs_grab_fs_root We are now using these for all roots, rename them to btrfs_put_root() and btrfs_grab_root(); Reviewed-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: Josef Bacik <josef@toxicpanda.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2020-01-24 22:33:01 +08:00
static inline struct btrfs_root *btrfs_grab_root(struct btrfs_root *root)
Btrfs: introduce grab/put functions for the root of the fs/file tree The grab/put funtions will be used in the next patch, which need grab the root object and ensure it is not freed. We use reference counter instead of the srcu lock is to aovid blocking the memory reclaim task, which invokes synchronize_srcu(). Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com>
2013-05-15 15:48:20 +08:00
{
btrfs: handle NULL roots in btrfs_put/btrfs_grab_fs_root We want to use this for dropping all roots, and in some error cases we may not have a root, so handle this to make the cleanup code easier. Make btrfs_grab_fs_root the same so we can use it in cases where the root may not exist (like the quota root). Reviewed-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: Josef Bacik <josef@toxicpanda.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2020-01-24 22:32:26 +08:00
if (!root)
return NULL;
btrfs: convert btrfs_root.refs from atomic_t to refcount_t refcount_t type and corresponding API should be used instead of atomic_t when the variable is used as a reference counter. This allows to avoid accidental refcounter overflows that might lead to use-after-free situations. Signed-off-by: Elena Reshetova <elena.reshetova@intel.com> Signed-off-by: Hans Liljestrand <ishkamiel@gmail.com> Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: David Windsor <dwindsor@gmail.com> Signed-off-by: David Sterba <dsterba@suse.com>
2017-03-03 16:55:18 +08:00
if (refcount_inc_not_zero(&root->refs))
Btrfs: introduce grab/put functions for the root of the fs/file tree The grab/put funtions will be used in the next patch, which need grab the root object and ensure it is not freed. We use reference counter instead of the srcu lock is to aovid blocking the memory reclaim task, which invokes synchronize_srcu(). Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com>
2013-05-15 15:48:20 +08:00
return root;
return NULL;
}
btrfs: move the root freeing stuff into btrfs_put_root There are a few different ways to free roots, either you allocated them yourself and you just do free_extent_buffer(root->node); free_extent_buffer(root->commit_node); btrfs_put_root(root); Which is the pattern for log roots. Or for snapshots/subvolumes that are being dropped you simply call btrfs_free_fs_root() which does all the cleanup for you. Unify this all into btrfs_put_root(), so that we don't free up things associated with the root until the last reference is dropped. This makes the root freeing code much more significant. The only caveat is at close_ctree() time we have to free the extent buffers for all of our main roots (extent_root, chunk_root, etc) because we have to drop the btree_inode and we'll run into issues if we hold onto those nodes until ->kill_sb() time. This will be addressed in the future when we kill the btree_inode. Signed-off-by: Josef Bacik <josef@toxicpanda.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2020-02-15 05:11:42 +08:00
void btrfs_put_root(struct btrfs_root *root);
Btrfs: Create extent_buffer interface for large blocksizes Signed-off-by: Chris Mason <chris.mason@oracle.com>
2007-10-16 04:14:19 +08:00
void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
Btrfs: avoid sleeping in verify_parent_transid while atomic verify_parent_transid needs to lock the extent range to make sure no IO is underway, and so it can safely clear the uptodate bits if our checks fail. But, a few callers are using it with spinlocks held. Most of the time, the generation numbers are going to match, and we don't want to switch to a blocking lock just for the error case. This adds an atomic flag to verify_parent_transid, and changes it to return EAGAIN if it needs to block to properly verifiy things. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2012-05-06 19:23:47 +08:00
int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
int atomic);
btrfs: Validate child tree block's level and first key We have several reports about node pointer points to incorrect child tree blocks, which could have even wrong owner and level but still with valid generation and checksum. Although btrfs check could handle it and print error message like: leaf parent key incorrect 60670574592 Kernel doesn't have enough check on this type of corruption correctly. At least add such check to read_tree_block() and btrfs_read_buffer(), where we need two new parameters @level and @first_key to verify the child tree block. The new @level check is mandatory and all call sites are already modified to extract expected level from its call chain. While @first_key is optional, the following call sites are skipping such check: 1) Root node/leaf As ROOT_ITEM doesn't contain the first key, skip @first_key check. 2) Direct backref Only parent bytenr and level is known and we need to resolve the key all by ourselves, skip @first_key check. Another note of this verification is, it needs extra info from nodeptr or ROOT_ITEM, so it can't fit into current tree-checker framework, which is limited to node/leaf boundary. Signed-off-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2018-03-29 09:08:11 +08:00
int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid, int level,
struct btrfs_key *first_key);
block: switch bios to blk_status_t Replace bi_error with a new bi_status to allow for a clear conversion. Note that device mapper overloaded bi_error with a private value, which we'll have to keep arround at least for now and thus propagate to a proper blk_status_t value. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-06-03 15:38:06 +08:00
blk_status_t btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
btrfs: use enum for wq endio metadata type The enum exists but is not consistently used. Signed-off-by: David Sterba <dsterba@suse.cz>
2014-07-30 06:25:45 +08:00
enum btrfs_wq_endio_type metadata);
Merge branch 'for-4.13-part1' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux Pull btrfs updates from David Sterba: "The core updates improve error handling (mostly related to bios), with the usual incremental work on the GFP_NOFS (mis)use removal, refactoring or cleanups. Except the two top patches, all have been in for-next for an extensive amount of time. User visible changes: - statx support - quota override tunable - improved compression thresholds - obsoleted mount option alloc_start Core updates: - bio-related updates: - faster bio cloning - no allocation failures - preallocated flush bios - more kvzalloc use, memalloc_nofs protections, GFP_NOFS updates - prep work for btree_inode removal - dir-item validation - qgoup fixes and updates - cleanups: - removed unused struct members, unused code, refactoring - argument refactoring (fs_info/root, caller -> callee sink) - SEARCH_TREE ioctl docs" * 'for-4.13-part1' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux: (115 commits) btrfs: Remove false alert when fiemap range is smaller than on-disk extent btrfs: Don't clear SGID when inheriting ACLs btrfs: fix integer overflow in calc_reclaim_items_nr btrfs: scrub: fix target device intialization while setting up scrub context btrfs: qgroup: Fix qgroup reserved space underflow by only freeing reserved ranges btrfs: qgroup: Introduce extent changeset for qgroup reserve functions btrfs: qgroup: Fix qgroup reserved space underflow caused by buffered write and quotas being enabled btrfs: qgroup: Return actually freed bytes for qgroup release or free data btrfs: qgroup: Cleanup btrfs_qgroup_prepare_account_extents function btrfs: qgroup: Add quick exit for non-fs extents Btrfs: rework delayed ref total_bytes_pinned accounting Btrfs: return old and new total ref mods when adding delayed refs Btrfs: always account pinned bytes when dropping a tree block ref Btrfs: update total_bytes_pinned when pinning down extents Btrfs: make BUG_ON() in add_pinned_bytes() an ASSERT() Btrfs: make add_pinned_bytes() take an s64 num_bytes instead of u64 btrfs: fix validation of XATTR_ITEM dir items btrfs: Verify dir_item in iterate_object_props btrfs: Check name_len before in btrfs_del_root_ref btrfs: Check name_len before reading btrfs_get_name ...
2017-07-06 07:41:23 +08:00
blk_status_t btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
Btrfs: replace tree->mapping with tree->private_data For extent_io tree's we have carried the address_mapping of the inode around in the io tree in order to pull the inode back out for calling into various tree ops hooks. This works fine when everything that has an extent_io_tree has an inode. But we are going to remove the btree_inode, so we need to change this. Instead just have a generic void * for private data that we can initialize with, and have all the tree ops use that instead. This had a lot of cascading changes but should be relatively straightforward. Signed-off-by: Josef Bacik <jbacik@fb.com> Reviewed-by: Chandan Rajendra <chandan@linux.vnet.ibm.com> Reviewed-by: David Sterba <dsterba@suse.com> [ minor reordering of the callback prototypes ] Signed-off-by: David Sterba <dsterba@suse.com>
2017-05-05 23:57:13 +08:00
int mirror_num, unsigned long bio_flags,
u64 bio_offset, void *private_data,
btrfs: unify end_io callbacks of async_submit_bio The end_io callbacks passed to btrfs_wq_submit_bio (btrfs_submit_bio_done and btree_submit_bio_done) are effectively the same code, there's no point to do the indirection. Export btrfs_submit_bio_done and call it directly. Reviewed-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2018-07-18 23:36:24 +08:00
extent_submit_bio_start_t *submit_bio_start);
blk_status_t btrfs_submit_bio_done(void *private_data, struct bio *bio,
int mirror_num);
Btrfs: Add a write ahead tree log to optimize synchronous operations File syncs and directory syncs are optimized by copying their items into a special (copy-on-write) log tree. There is one log tree per subvolume and the btrfs super block points to a tree of log tree roots. After a crash, items are copied out of the log tree and back into the subvolume. See tree-log.c for all the details. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-06 04:13:11 +08:00
int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info);
Btrfs: fix tree logs parallel sync To improve performance, btrfs_sync_log merges tree log sync requests. But it wrongly merges sync requests for different tree logs. If multiple tree logs are synced at the same time, only one of them actually gets synced. This patch has following changes to fix the bug: Move most tree log related fields in btrfs_fs_info to btrfs_root. This allows merging sync requests separately for each tree log. Don't insert root item into the log root tree immediately after log tree is allocated. Root item for log tree is inserted when log tree get synced for the first time. This allows syncing the log root tree without first syncing all log trees. At tree-log sync, btrfs_sync_log first sync the log tree; then updates corresponding root item in the log root tree; sync the log root tree; then update the super block. Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
2009-01-22 01:54:03 +08:00
int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
struct btrfs_root *root);
Btrfs: fix memory leak of block group cache While processing delayed refs, we may update block group's statistics and attach it to cur_trans->dirty_bgs, and later writing dirty block groups will process the list, which happens during btrfs_commit_transaction(). For whatever reason, the transaction is aborted and dirty_bgs is not processed in cleanup_transaction(), we end up with memory leak of these dirty block group cache. Since btrfs_start_dirty_block_groups() doesn't make it go to the commit critical section, this also adds the cleanup work inside it. Signed-off-by: Liu Bo <bo.li.liu@oracle.com> Signed-off-by: David Sterba <dsterba@suse.com>
2016-07-21 08:44:12 +08:00
void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *trans,
btrfs: take an fs_info directly when the root is not used otherwise There are loads of functions in btrfs that accept a root parameter but only use it to obtain an fs_info pointer. Let's convert those to just accept an fs_info pointer directly. Signed-off-by: Jeff Mahoney <jeffm@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2016-06-23 06:54:24 +08:00
struct btrfs_fs_info *fs_info);
btrfs: enhance transaction abort infrastructure Signed-off-by: Jeff Mahoney <jeffm@suse.com>
2012-03-02 00:24:58 +08:00
void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans,
btrfs: take an fs_info directly when the root is not used otherwise There are loads of functions in btrfs that accept a root parameter but only use it to obtain an fs_info pointer. Let's convert those to just accept an fs_info pointer directly. Signed-off-by: Jeff Mahoney <jeffm@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2016-06-23 06:54:24 +08:00
struct btrfs_fs_info *fs_info);
Btrfs: added helper to create new trees This creates a brand new tree. Will be used to create the quota tree. Signed-off-by: Arne Jansen <sensille@gmx.net>
2011-09-13 18:44:20 +08:00
struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
u64 objectid);
int btree_lock_page_hook(struct page *page, void *data,
void (*flush_fn)(void *));
btrfs: sink get_extent parameter to read_extent_buffer_pages All callers pass btree_get_extent, which needs to be exported. Signed-off-by: David Sterba <dsterba@suse.com>
2017-06-23 10:09:57 +08:00
struct extent_map *btree_get_extent(struct btrfs_inode *inode,
btrfs: drop create parameter to btrfs_get_extent() We only pass this as 1 from __extent_writepage_io(). The parameter basically means "pretend I didn't pass in a page". This is silly since we can simply not pass in the page. Get rid of the parameter from btrfs_get_extent(), and since it's used as a get_extent_t callback, remove it from get_extent_t and btree_get_extent(), neither of which need it. While we're here, let's document btrfs_get_extent(). Signed-off-by: Omar Sandoval <osandov@fb.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2019-12-03 09:34:23 +08:00
struct page *page, size_t pg_offset,
u64 start, u64 len);
btrfs: Add raid56 support for updating num_tolerated_disk_barrier_failures in btrfs_balance Code for updating fs_info->num_tolerated_disk_barrier_failures in btrfs_balance() lacks raid56 support. Reason: Above code was wroten in 2012-08-01, together with btrfs_calc_num_tolerated_disk_barrier_failures()'s first version. Then, btrfs_calc_num_tolerated_disk_barrier_failures() got updated later to support raid56, but code in btrfs_balance() was not updated together. Fix: Merge above similar code to a common function: btrfs_get_num_tolerated_disk_barrier_failures() and make it support both case. It can fix this bug with a bonus of cleanup, and make these code never in above no-sync state from now on. Suggested-by: Anand Jain <anand.jain@oracle.com> Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com> Signed-off-by: Chris Mason <clm@fb.com>
2015-08-19 15:54:15 +08:00
int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags);
btrfs: use slab for end_io_wq structures The structure is frequently reused. Rename it according to the slab name. Signed-off-by: David Sterba <dsterba@suse.cz>
2014-07-30 06:55:42 +08:00
int __init btrfs_end_io_wq_init(void);
btrfs: add more __cold annotations The __cold functions are placed to a special section, as they're expected to be called rarely. This could help i-cache prefetches or help compiler to decide which branches are more/less likely to be taken without any other annotations needed. Though we can't add more __exit annotations, it's still possible to add __cold (that's also added with __exit). That way the following function categories are tagged: - printf wrappers, error messages - exit helpers Signed-off-by: David Sterba <dsterba@suse.com>
2018-02-20 00:24:18 +08:00
void __cold btrfs_end_io_wq_exit(void);
Btrfs: make a lockdep class for the extent buffer locks Btrfs is currently using spin_lock_nested with a nested value based on the tree depth of the block. But, this doesn't quite work because the max tree depth is bigger than what spin_lock_nested can deal with, and because locks are sometimes taken before the level field is filled in. The solution here is to use lockdep_set_class_and_name instead, and to set the class before unlocking the pages when the block is read from the disk and just after init of a freshly allocated tree block. btrfs_clear_path_blocking is also changed to take the locks in the proper order, and it also makes sure all the locks currently held are properly set to blocking before it tries to retake the spinlocks. Otherwise, lockdep gets upset about bad lock orderin. The lockdep magic cam from Peter Zijlstra <peterz@infradead.org> Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-13 03:09:45 +08:00
#ifdef CONFIG_DEBUG_LOCK_ALLOC
Btrfs: make a lockdep class for each root This patch was originally from Tejun Heo. lockdep complains about the btrfs locking because we sometimes take btree locks from two different trees at the same time. The current classes are based only on level in the btree, which isn't enough information for lockdep to figure out if the lock is safe. This patch makes a class for each type of tree, and lumps all the FS trees that actually have files and directories into the same class. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2011-07-27 04:11:19 +08:00
void btrfs_init_lockdep(void);
void btrfs_set_buffer_lockdep_class(u64 objectid,
struct extent_buffer *eb, int level);
Btrfs: make a lockdep class for the extent buffer locks Btrfs is currently using spin_lock_nested with a nested value based on the tree depth of the block. But, this doesn't quite work because the max tree depth is bigger than what spin_lock_nested can deal with, and because locks are sometimes taken before the level field is filled in. The solution here is to use lockdep_set_class_and_name instead, and to set the class before unlocking the pages when the block is read from the disk and just after init of a freshly allocated tree block. btrfs_clear_path_blocking is also changed to take the locks in the proper order, and it also makes sure all the locks currently held are properly set to blocking before it tries to retake the spinlocks. Otherwise, lockdep gets upset about bad lock orderin. The lockdep magic cam from Peter Zijlstra <peterz@infradead.org> Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-13 03:09:45 +08:00
#else
Btrfs: make a lockdep class for each root This patch was originally from Tejun Heo. lockdep complains about the btrfs locking because we sometimes take btree locks from two different trees at the same time. The current classes are based only on level in the btree, which isn't enough information for lockdep to figure out if the lock is safe. This patch makes a class for each type of tree, and lumps all the FS trees that actually have files and directories into the same class. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2011-07-27 04:11:19 +08:00
static inline void btrfs_init_lockdep(void)
{ }
static inline void btrfs_set_buffer_lockdep_class(u64 objectid,
struct extent_buffer *eb, int level)
Btrfs: make a lockdep class for the extent buffer locks Btrfs is currently using spin_lock_nested with a nested value based on the tree depth of the block. But, this doesn't quite work because the max tree depth is bigger than what spin_lock_nested can deal with, and because locks are sometimes taken before the level field is filled in. The solution here is to use lockdep_set_class_and_name instead, and to set the class before unlocking the pages when the block is read from the disk and just after init of a freshly allocated tree block. btrfs_clear_path_blocking is also changed to take the locks in the proper order, and it also makes sure all the locks currently held are properly set to blocking before it tries to retake the spinlocks. Otherwise, lockdep gets upset about bad lock orderin. The lockdep magic cam from Peter Zijlstra <peterz@infradead.org> Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-13 03:09:45 +08:00
{
}
#endif
btrfs: replace GPL boilerplate by SPDX -- headers Remove GPL boilerplate text (long, short, one-line) and keep the rest, ie. personal, company or original source copyright statements. Add the SPDX header. Unify the include protection macros to match the file names. Signed-off-by: David Sterba <dsterba@suse.com>
2018-04-04 01:16:55 +08:00
Btrfs: Add backing store, memory management Signed-off-by: Chris Mason <chris.mason@oracle.com>
2007-02-02 22:18:22 +08:00
#endif