- 16 5月, 2022 14 次提交
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由 Omar Sandoval 提交于
All of our inode creation code paths duplicate the calls to btrfs_init_inode_security() and btrfs_add_link(). Subvolume creation additionally duplicates property inheritance and the call to btrfs_set_inode_index(). Fix this by moving the common code into btrfs_create_new_inode(). This accomplishes a few things at once: 1. It reduces code duplication. 2. It allows us to set up the inode completely before inserting the inode item, removing calls to btrfs_update_inode(). 3. It fixes a leak of an inode on disk in some error cases. For example, in btrfs_create(), if btrfs_new_inode() succeeds, then we have inserted an inode item and its inode ref. However, if something after that fails (e.g., btrfs_init_inode_security()), then we end the transaction and then decrement the link count on the inode. If the transaction is committed and the system crashes before the failed inode is deleted, then we leak that inode on disk. Instead, this refactoring aborts the transaction when we can't recover more gracefully. 4. It exposes various ways that subvolume creation diverges from mkdir in terms of inheriting flags, properties, permissions, and POSIX ACLs, a lot of which appears to be accidental. This patch explicitly does _not_ change the existing non-standard behavior, but it makes those differences more clear in the code and documents them so that we can discuss whether they should be changed. Reviewed-by: NSweet Tea Dorminy <sweettea-kernel@dorminy.me> Signed-off-by: NOmar Sandoval <osandov@fb.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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由 Omar Sandoval 提交于
The various inode creation code paths do not account for the compression property, POSIX ACLs, or the parent inode item when starting a transaction. Fix it by refactoring all of these code paths to use a new function, btrfs_new_inode_prepare(), which computes the correct number of items. To do so, it needs to know whether POSIX ACLs will be created, so move the ACL creation into that function. To reduce the number of arguments that need to be passed around for inode creation, define struct btrfs_new_inode_args containing all of the relevant information. btrfs_new_inode_prepare() will also be a good place to set up the fscrypt context and encrypted filename in the future. Reviewed-by: NSweet Tea Dorminy <sweettea-kernel@dorminy.me> Signed-off-by: NOmar Sandoval <osandov@fb.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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由 Omar Sandoval 提交于
btrfs_{mknod,create,mkdir}() are now identical other than the inode initialization and some inconsequential function call order differences. Factor out the common code to reduce code duplication. Reviewed-by: NSweet Tea Dorminy <sweettea-kernel@dorminy.me> Signed-off-by: NOmar Sandoval <osandov@fb.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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由 Omar Sandoval 提交于
Instead of calling new_inode() and inode_init_owner() inside of btrfs_new_inode(), do it in the callers. This allows us to pass in just the inode instead of the mnt_userns and mode and removes the need for memalloc_nofs_{save,restores}() since we do it before starting a transaction. In create_subvol(), it also means we no longer have to look up the inode again to instantiate it. This also paves the way for some more cleanups in later patches. This also removes the comments about Smack checking i_op, which are no longer true since commit 5d6c3191 ("xattr: Add __vfs_{get,set,remove}xattr helpers"). Now it checks inode->i_opflags & IOP_XATTR, which is set based on sb->s_xattr. Signed-off-by: NOmar Sandoval <osandov@fb.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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由 Gabriel Niebler 提交于
This function can be simplified by refactoring to use the new iterator macro. No functional changes. Signed-off-by: NMarcos Paulo de Souza <mpdesouza@suse.com> Signed-off-by: NGabriel Niebler <gniebler@suse.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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由 Omar Sandoval 提交于
btrfs_new_inode() inherits the inode flags from the parent directory and the mount options _after_ we fill the inode item. This works because all of the callers of btrfs_new_inode() make further changes to the inode and then call btrfs_update_inode(). It'd be better to fully initialize the inode once to avoid the extra update, so as a first step, set the inode flags _before_ filling the inode item. Reviewed-by: NSweet Tea Dorminy <sweettea-kernel@dorminy.me> Signed-off-by: NOmar Sandoval <osandov@fb.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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由 Omar Sandoval 提交于
Every call of btrfs_new_inode() is immediately preceded by a call to btrfs_get_free_objectid(). Since getting an inode number is part of creating a new inode, this is better off being moved into btrfs_new_inode(). While we're here, get rid of the comment about reclaiming inode numbers, since we only did that when using the ino cache, which was removed by commit 5297199a ("btrfs: remove inode number cache feature"). Reviewed-by: NSweet Tea Dorminy <sweettea-kernel@dorminy.me> Signed-off-by: NOmar Sandoval <osandov@fb.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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由 Omar Sandoval 提交于
For everything other than a subvolume root inode, we get the parent objectid from the parent directory. For the subvolume root inode, the parent objectid is the same as the inode's objectid. We can find this within btrfs_new_inode() instead of passing it. Reviewed-by: NSweet Tea Dorminy <sweettea-kernel@dorminy.me> Signed-off-by: NOmar Sandoval <osandov@fb.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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由 Omar Sandoval 提交于
btrfs_new_inode() already returns an inode with nlink set to 1 (via inode_init_always()). Get rid of the unnecessary set. Reviewed-by: NSweet Tea Dorminy <sweettea-kernel@dorminy.me> Signed-off-by: NOmar Sandoval <osandov@fb.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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由 Omar Sandoval 提交于
new_inode() always returns an inode with i_blocks and i_bytes set to 0 (via inode_init_always()). Remove the unnecessary call to inode_set_bytes() in btrfs_new_inode(). Reviewed-by: NSweet Tea Dorminy <sweettea-kernel@dorminy.me> Signed-off-by: NOmar Sandoval <osandov@fb.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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由 Omar Sandoval 提交于
btrfs_new_inode() always returns an inode with i_size and disk_i_size set to 0 (via inode_init_always() and btrfs_alloc_inode(), respectively). Remove the unnecessary calls to btrfs_i_size_write() in btrfs_mkdir() and btrfs_create_subvol_root(). Reviewed-by: NSweet Tea Dorminy <sweettea-kernel@dorminy.me> Signed-off-by: NOmar Sandoval <osandov@fb.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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由 Omar Sandoval 提交于
This is a trivial wrapper around btrfs_add_link(). The only thing it does other than moving arguments around is translating a > 0 return value to -EEXIST. As far as I can tell, btrfs_add_link() won't return > 0 (and if it did, the existing callsites in, e.g., btrfs_mkdir() would be broken). The check itself dates back to commit 2c90e5d6 ("Btrfs: still corruption hunting"), so it's probably left over from debugging. Let's just get rid of btrfs_add_nondir(). Reviewed-by: NSweet Tea Dorminy <sweettea-kernel@dorminy.me> Signed-off-by: NOmar Sandoval <osandov@fb.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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由 Omar Sandoval 提交于
btrfs_rename() and btrfs_rename_exchange() don't account for enough items. Replace the incorrect explanations with a specific breakdown of the number of items and account them accurately. Note that this glosses over RENAME_WHITEOUT because the next commit is going to rework that, too. Reviewed-by: NSweet Tea Dorminy <sweettea-kernel@dorminy.me> Signed-off-by: NOmar Sandoval <osandov@fb.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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由 Omar Sandoval 提交于
__btrfs_unlink_inode() calls btrfs_update_inode() on the parent directory in order to update its size and sequence number. Make sure we account for it. Reviewed-by: NSweet Tea Dorminy <sweettea-kernel@dorminy.me> Signed-off-by: NOmar Sandoval <osandov@fb.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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- 28 4月, 2022 1 次提交
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由 Chung-Chiang Cheng 提交于
inode_can_compress will be used outside of inode.c to check the availability of setting compression flag by xattr. This patch moves this function as an internal helper and renames it to btrfs_inode_can_compress. Reviewed-by: NNikolay Borisov <nborisov@suse.com> Signed-off-by: NChung-Chiang Cheng <cccheng@synology.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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- 19 4月, 2022 2 次提交
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由 Christoph Hellwig 提交于
When a bio is split in btrfs_submit_direct, dip->file_offset contains the file offset for the first bio. But this means the start value used in btrfs_end_dio_bio to record the write location for zone devices is incorrect for subsequent bios. CC: stable@vger.kernel.org # 5.16+ Reviewed-by: NJohannes Thumshirn <johannes.thumshirn@wdc.com> Reviewed-by: NNaohiro Aota <naohiro.aota@wdc.com> Reviewed-by: NQu Wenruo <wqu@suse.com> Reviewed-by: NSweet Tea Dorminy <sweettea-kernel@dorminy.me> Signed-off-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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由 Christoph Hellwig 提交于
When a bio is split in btrfs_submit_direct, dip->file_offset contains the file offset for the first bio. But this means the start value used in btrfs_check_read_dio_bio is incorrect for subsequent bios. Add a file_offset field to struct btrfs_bio to pass along the correct offset. Given that check_data_csum only uses start of an error message this means problems with this miscalculation will only show up when I/O fails or checksums mismatch. The logic was removed in f4f39fc5 ("btrfs: remove btrfs_bio::logical member") but we need it due to the bio splitting. CC: stable@vger.kernel.org # 5.16+ Reviewed-by: NJohannes Thumshirn <johannes.thumshirn@wdc.com> Reviewed-by: NNaohiro Aota <naohiro.aota@wdc.com> Reviewed-by: NQu Wenruo <wqu@suse.com> Reviewed-by: NSweet Tea Dorminy <sweettea-kernel@dorminy.me> Signed-off-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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- 06 4月, 2022 2 次提交
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由 Naohiro Aota 提交于
Running generic/406 causes the following WARNING in btrfs_destroy_inode() which tells there are outstanding extents left. In btrfs_get_blocks_direct_write(), we reserve a temporary outstanding extents with btrfs_delalloc_reserve_metadata() (or indirectly from btrfs_delalloc_reserve_space(()). We then release the outstanding extents with btrfs_delalloc_release_extents(). However, the "len" can be modified in the COW case, which releases fewer outstanding extents than expected. Fix it by calling btrfs_delalloc_release_extents() for the original length. To reproduce the warning, the filesystem should be 1 GiB. It's triggering a short-write, due to not being able to allocate a large extent and instead allocating a smaller one. WARNING: CPU: 0 PID: 757 at fs/btrfs/inode.c:8848 btrfs_destroy_inode+0x1e6/0x210 [btrfs] Modules linked in: btrfs blake2b_generic xor lzo_compress lzo_decompress raid6_pq zstd zstd_decompress zstd_compress xxhash zram zsmalloc CPU: 0 PID: 757 Comm: umount Not tainted 5.17.0-rc8+ #101 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS d55cb5a 04/01/2014 RIP: 0010:btrfs_destroy_inode+0x1e6/0x210 [btrfs] RSP: 0018:ffffc9000327bda8 EFLAGS: 00010206 RAX: 0000000000000000 RBX: ffff888100548b78 RCX: 0000000000000000 RDX: 0000000000026900 RSI: 0000000000000000 RDI: ffff888100548b78 RBP: ffff888100548940 R08: 0000000000000000 R09: ffff88810b48aba8 R10: 0000000000000001 R11: ffff8881004eb240 R12: ffff88810b48a800 R13: ffff88810b48ec08 R14: ffff88810b48ed00 R15: ffff888100490c68 FS: 00007f8549ea0b80(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f854a09e733 CR3: 000000010a2e9003 CR4: 0000000000370eb0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> destroy_inode+0x33/0x70 dispose_list+0x43/0x60 evict_inodes+0x161/0x1b0 generic_shutdown_super+0x2d/0x110 kill_anon_super+0xf/0x20 btrfs_kill_super+0xd/0x20 [btrfs] deactivate_locked_super+0x27/0x90 cleanup_mnt+0x12c/0x180 task_work_run+0x54/0x80 exit_to_user_mode_prepare+0x152/0x160 syscall_exit_to_user_mode+0x12/0x30 do_syscall_64+0x42/0x80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f854a000fb7 Fixes: f0bfa76a ("btrfs: fix ENOSPC failure when attempting direct IO write into NOCOW range") CC: stable@vger.kernel.org # 5.17 Reviewed-by: NJohannes Thumshirn <johannes.thumshirn@wdc.com> Tested-by: NJohannes Thumshirn <johannes.thumshirn@wdc.com> Reviewed-by: NFilipe Manana <fdmanana@suse.com> Signed-off-by: NNaohiro Aota <naohiro.aota@wdc.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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由 Haowen Bai 提交于
The logic !A || A && B is equivalent to !A || B. so we can make code clear. Note: though it's preferred to be in the more human readable form, there have been repeated reports and patches as the expression is detected by tools so apply it to reduce the load. Reviewed-by: NJohannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: NHaowen Bai <baihaowen@meizu.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> [ add note ] Signed-off-by: NDavid Sterba <dsterba@suse.com>
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- 02 4月, 2022 1 次提交
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由 Matthew Wilcox (Oracle) 提交于
While btrfs doesn't use large folios yet, this should have been changed as part of the conversion from invalidatepage to invalidate_folio. Signed-off-by: NMatthew Wilcox (Oracle) <willy@infradead.org> Reviewed-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NAl Viro <viro@zeniv.linux.org.uk> Acked-by: NAl Viro <viro@zeniv.linux.org.uk>
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- 25 3月, 2022 2 次提交
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由 Kaiwen Hu 提交于
A subvolume with an active swapfile must not be deleted otherwise it would not be possible to deactivate it. After the subvolume is deleted, we cannot swapoff the swapfile in this deleted subvolume because the path is unreachable. The swapfile is still active and holding references, the filesystem cannot be unmounted. The test looks like this: mkfs.btrfs -f $dev > /dev/null mount $dev $mnt btrfs sub create $mnt/subvol touch $mnt/subvol/swapfile chmod 600 $mnt/subvol/swapfile chattr +C $mnt/subvol/swapfile dd if=/dev/zero of=$mnt/subvol/swapfile bs=1K count=4096 mkswap $mnt/subvol/swapfile swapon $mnt/subvol/swapfile btrfs sub delete $mnt/subvol swapoff $mnt/subvol/swapfile # failed: No such file or directory swapoff --all unmount $mnt # target is busy. To prevent above issue, we simply check that whether the subvolume contains any active swapfile, and stop the deleting process. This behavior is like snapshot ioctl dealing with a swapfile. CC: stable@vger.kernel.org # 5.4+ Reviewed-by: NRobbie Ko <robbieko@synology.com> Reviewed-by: NQu Wenruo <wqu@suse.com> Reviewed-by: NFilipe Manana <fdmanana@suse.com> Signed-off-by: NKaiwen Hu <kevinhu@synology.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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由 Josef Bacik 提交于
This is a long time leftover from when I originally added the free space inode, the point was to catch cases where we weren't honoring the NOCOW flag. However there exists a race with relocation, if we allocate our free space inode in a block group that is about to be relocated, we could trigger the COW path before the relocation has the opportunity to find the extents and delete the free space cache. In production where we have auto-relocation enabled we're seeing this WARN_ON_ONCE() around 5k times in a 2 week period, so not super common but enough that it's at the top of our metrics. We're properly handling the error here, and with us phasing out v1 space cache anyway just drop the WARN_ON_ONCE. Signed-off-by: NJosef Bacik <josef@toxicpanda.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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- 23 3月, 2022 1 次提交
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由 Muchun Song 提交于
The inode allocation is supposed to use alloc_inode_sb(), so convert kmem_cache_alloc() of all filesystems to alloc_inode_sb(). Link: https://lkml.kernel.org/r/20220228122126.37293-5-songmuchun@bytedance.comSigned-off-by: NMuchun Song <songmuchun@bytedance.com> Acked-by: Theodore Ts'o <tytso@mit.edu> [ext4] Acked-by: NRoman Gushchin <roman.gushchin@linux.dev> Cc: Alex Shi <alexs@kernel.org> Cc: Anna Schumaker <Anna.Schumaker@Netapp.com> Cc: Chao Yu <chao@kernel.org> Cc: Dave Chinner <david@fromorbit.com> Cc: Fam Zheng <fam.zheng@bytedance.com> Cc: Jaegeuk Kim <jaegeuk@kernel.org> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Kari Argillander <kari.argillander@gmail.com> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Michal Hocko <mhocko@kernel.org> Cc: Qi Zheng <zhengqi.arch@bytedance.com> Cc: Shakeel Butt <shakeelb@google.com> Cc: Trond Myklebust <trond.myklebust@hammerspace.com> Cc: Vladimir Davydov <vdavydov.dev@gmail.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Wei Yang <richard.weiyang@gmail.com> Cc: Xiongchun Duan <duanxiongchun@bytedance.com> Cc: Yang Shi <shy828301@gmail.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 15 3月, 2022 2 次提交
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由 Matthew Wilcox (Oracle) 提交于
These filesystems use __set_page_dirty_nobuffers() either directly or with a very thin wrapper; convert them en masse. Signed-off-by: NMatthew Wilcox (Oracle) <willy@infradead.org> Tested-by: NDamien Le Moal <damien.lemoal@opensource.wdc.com> Acked-by: NDamien Le Moal <damien.lemoal@opensource.wdc.com> Tested-by: Mike Marshall <hubcap@omnibond.com> # orangefs Tested-by: David Howells <dhowells@redhat.com> # afs
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由 Matthew Wilcox (Oracle) 提交于
A lot of the underlying infrastructure in btrfs needs to be switched over to folios, but this at least documents that invalidatepage can't be passed a tail page. Signed-off-by: NMatthew Wilcox (Oracle) <willy@infradead.org> Tested-by: NDamien Le Moal <damien.lemoal@opensource.wdc.com> Acked-by: NDamien Le Moal <damien.lemoal@opensource.wdc.com> Tested-by: Mike Marshall <hubcap@omnibond.com> # orangefs Tested-by: David Howells <dhowells@redhat.com> # afs
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- 14 3月, 2022 15 次提交
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由 Filipe Manana 提交于
When an inode has a last_reflink_trans matching the current transaction, we have to take special care when logging its checksums in order to avoid getting checksum items with overlapping ranges in a log tree, which could result in missing checksums after log replay (more on that in the changelogs of commit 40e046ac ("Btrfs: fix missing data checksums after replaying a log tree") and commit e289f03e ("btrfs: fix corrupt log due to concurrent fsync of inodes with shared extents")). We also need to make sure a full fsync will copy all old file extent items it finds in modified leaves, because they might have been copied from some other inode. However once we fsync an inode, we don't need to keep paying the price of that extra special care in future fsyncs done in the same transaction, unless the inode is used for another reflink operation or the full sync flag is set on it (truncate, failure to allocate extent maps for holes, and other exceptional and infrequent cases). So after we fsync an inode reset its last_unlink_trans to zero. In case another reflink happens, we continue to update the last_reflink_trans of the inode, just as before. Also set last_reflink_trans to the generation of the last transaction that modified the inode whenever we need to set the full sync flag on the inode, just like when we need to load an inode from disk after eviction. Signed-off-by: NFilipe Manana <fdmanana@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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由 Josef Bacik 提交于
I hit some weird panics while fixing up the error handling from btrfs_lookup_bio_sums(). Turns out the compression path will complete the bio we use if we set up any of the compression bios and then return an error, and then btrfs_submit_data_bio() will also call bio_endio() on the bio. Fix this by making btrfs_submit_compressed_read() responsible for calling bio_endio() on the bio if there are any errors. Currently it was only doing it if we created the compression bios, otherwise it was depending on btrfs_submit_data_bio() to do the right thing. This creates the above problem, so fix up btrfs_submit_compressed_read() to always call bio_endio() in case of an error, and then simply return from btrfs_submit_data_bio() if we had to call btrfs_submit_compressed_read(). Signed-off-by: NJosef Bacik <josef@toxicpanda.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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由 Omar Sandoval 提交于
The implementation resembles direct I/O: we have to flush any ordered extents, invalidate the page cache, and do the io tree/delalloc/extent map/ordered extent dance. From there, we can reuse the compression code with a minor modification to distinguish the write from writeback. This also creates inline extents when possible. Signed-off-by: NOmar Sandoval <osandov@fb.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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由 Omar Sandoval 提交于
There are 4 main cases: 1. Inline extents: we copy the data straight out of the extent buffer. 2. Hole/preallocated extents: we fill in zeroes. 3. Regular, uncompressed extents: we read the sectors we need directly from disk. 4. Regular, compressed extents: we read the entire compressed extent from disk and indicate what subset of the decompressed extent is in the file. This initial implementation simplifies a few things that can be improved in the future: - Cases 1, 3, and 4 allocate temporary memory to read into before copying out to userspace. - We don't do read repair, because it turns out that read repair is currently broken for compressed data. - We hold the inode lock during the operation. Note that we don't need to hold the mmap lock. We may race with btrfs_page_mkwrite() and read the old data from before the page was dirtied: btrfs_page_mkwrite btrfs_encoded_read --------------------------------------------------- (enter) (enter) btrfs_wait_ordered_range lock_extent_bits btrfs_page_set_dirty unlock_extent_cached (exit) lock_extent_bits read extent (dirty page hasn't been flushed, so this is the old data) unlock_extent_cached (exit) we read the old data from before the page was dirtied. But, that's true even if we were to hold the mmap lock: btrfs_page_mkwrite btrfs_encoded_read ------------------------------------------------------------------- (enter) (enter) btrfs_inode_lock(BTRFS_ILOCK_MMAP) down_read(i_mmap_lock) (blocked) btrfs_wait_ordered_range lock_extent_bits read extent (page hasn't been dirtied, so this is the old data) unlock_extent_cached btrfs_inode_unlock(BTRFS_ILOCK_MMAP) down_read(i_mmap_lock) returns lock_extent_bits btrfs_page_set_dirty unlock_extent_cached In other words, this is inherently racy, so it's fine that we return the old data in this tiny window. Signed-off-by: NOmar Sandoval <osandov@fb.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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由 Omar Sandoval 提交于
Currently, an inline extent is always created after i_size is extended from btrfs_dirty_pages(). However, for encoded writes, we only want to update i_size after we successfully created the inline extent. Add an update_i_size parameter to cow_file_range_inline() and insert_inline_extent() and pass in the size of the extent rather than determining it from i_size. Reviewed-by: NJosef Bacik <josef@toxicpanda.com> Signed-off-by: NOmar Sandoval <osandov@fb.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> [ reformat comment ] Signed-off-by: NDavid Sterba <dsterba@suse.com>
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由 Omar Sandoval 提交于
The start parameter to cow_file_range_inline() (and insert_inline_extent()) is always 0, so get rid of it and simplify the logic in those two functions. Pass btrfs_inode to insert_inline_extent() and remove the redundant root parameter. Also document the requirements for creating an inline extent. No functional change. Signed-off-by: NOmar Sandoval <osandov@fb.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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由 Omar Sandoval 提交于
Currently, we always reserve the same extent size in the file and extent size on disk for delalloc because the former is the worst case for the latter. For BTRFS_IOC_ENCODED_WRITE writes, we know the exact size of the extent on disk, which may be less than or greater than (for bookends) the size in the file. Add a disk_num_bytes parameter to btrfs_delalloc_reserve_metadata() so that we can reserve the correct amount of csum bytes. No functional change. Reviewed-by: NNikolay Borisov <nborisov@suse.com> Reviewed-by: NJosef Bacik <josef@toxicpanda.com> Signed-off-by: NOmar Sandoval <osandov@fb.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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由 Omar Sandoval 提交于
Currently, we only create ordered extents when ram_bytes == num_bytes and offset == 0. However, BTRFS_IOC_ENCODED_WRITE writes may create extents which only refer to a subset of the full unencoded extent, so we need to plumb these fields through the ordered extent infrastructure and pass them down to insert_reserved_file_extent(). Since we're changing the btrfs_add_ordered_extent* signature, let's get rid of the trivial wrappers and add a kernel-doc. Reviewed-by: NNikolay Borisov <nborisov@suse.com> Reviewed-by: NJosef Bacik <josef@toxicpanda.com> Signed-off-by: NOmar Sandoval <osandov@fb.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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由 Omar Sandoval 提交于
btrfs_csum_one_bio() loops over each filesystem block in the bio while keeping a cursor of its current logical position in the file in order to look up the ordered extent to add the checksums to. However, this doesn't make much sense for compressed extents, as a sector on disk does not correspond to a sector of decompressed file data. It happens to work because: 1) the compressed bio always covers one ordered extent 2) the size of the bio is always less than the size of the ordered extent However, the second point will not always be true for encoded writes. Let's add a boolean parameter to btrfs_csum_one_bio() to indicate that it can assume that the bio only covers one ordered extent. Since we're already changing the signature, let's get rid of the contig parameter and make it implied by the offset parameter, similar to the change we recently made to btrfs_lookup_bio_sums(). Additionally, let's rename nr_sectors to blockcount to make it clear that it's the number of filesystem blocks, not the number of 512-byte sectors. Reviewed-by: NJosef Bacik <josef@toxicpanda.com> Reviewed-by: NNikolay Borisov <nborisov@suse.com> Signed-off-by: NOmar Sandoval <osandov@fb.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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由 Filipe Manana 提交于
At btrfs_do_readpage(), if we get an error when trying to lookup for an extent map, we end up marking the page with the error bit, clearing the uptodate bit on it, and doing everything else that should be done. However we return success (0) to the caller, when we should return the error encoded in the extent map pointer. So fix that by returning the error encoded in the pointer. Reviewed-by: NJohannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: NFilipe Manana <fdmanana@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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由 David Sterba 提交于
The static_assert introduced in 6bab69c6 ("build_bug.h: add wrapper for _Static_assert") has been supported by compilers for a long time (gcc 4.6, clang 3.0) and can be used in header files. We don't need to put BUILD_BUG_ON to random functions but rather keep it next to the definition. The exception here is the UAPI header btrfs_tree.h that could be potentially included by userspace code and the static assert is not defined (nor used in any other header). Reviewed-by: NJohannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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由 Josef Bacik 提交于
When we stop tracking metadata blocks all of snapshotting will break, so disable it until I add the snapshot root and drop tree support. Signed-off-by: NJosef Bacik <josef@toxicpanda.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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由 Filipe Manana 提交于
During a rename, we call __btrfs_unlink_inode(), which will call btrfs_del_inode_ref_in_log() and btrfs_del_dir_entries_in_log(), in order to remove an inode reference and a directory entry from the log. These are necessary when __btrfs_unlink_inode() is called from the unlink path, but not necessary when it's called from a rename context, because: 1) For the btrfs_del_inode_ref_in_log() call, it's pointless to delete the inode reference related to the old name, because later in the rename path we call btrfs_log_new_name(), which will drop all inode references from the log and copy all inode references from the subvolume tree to the log tree. So we are doing one unnecessary btree operation which adds additional latency and lock contention in case there are other tasks accessing the log tree; 2) For the btrfs_del_dir_entries_in_log() call, we are now doing the equivalent at btrfs_log_new_name() since the previous patch in the series, that has the subject "btrfs: avoid logging all directory changes during renames". In fact, having __btrfs_unlink_inode() call this function not only adds additional latency and lock contention due to the extra btree operation, but also can make btrfs_log_new_name() unnecessarily log a range item to track the deletion of the old name, since it has no way to known that the directory entry related to the old name was previously logged and already deleted by __btrfs_unlink_inode() through its call to btrfs_del_dir_entries_in_log(). So skip those calls at __btrfs_unlink_inode() when we are doing a rename. Skipping them also allows us now to reduce the duration of time we are pinning a log transaction during renames, which is always beneficial as it's not delaying so much other tasks trying to sync the log tree, in particular we end up not holding the log transaction pinned while adding the new name (adding inode ref, directory entry, etc). This change is part of a patchset comprised of the following patches: 1/5 btrfs: add helper to delete a dir entry from a log tree 2/5 btrfs: pass the dentry to btrfs_log_new_name() instead of the inode 3/5 btrfs: avoid logging all directory changes during renames 4/5 btrfs: stop doing unnecessary log updates during a rename 5/5 btrfs: avoid inode logging during rename and link when possible Just like the previous patch in the series, "btrfs: avoid logging all directory changes during renames", the following script mimics part of what a package installation/upgrade with zypper does, which is basically renaming a lot of files, in some directory under /usr, to a name with a suffix of "-RPMDELETE": $ cat test.sh #!/bin/bash DEV=/dev/nvme0n1 MNT=/mnt/nvme0n1 NUM_FILES=10000 mkfs.btrfs -f $DEV mount $DEV $MNT mkdir $MNT/testdir for ((i = 1; i <= $NUM_FILES; i++)); do echo -n > $MNT/testdir/file_$i done sync # Do some change to testdir and fsync it. echo -n > $MNT/testdir/file_$((NUM_FILES + 1)) xfs_io -c "fsync" $MNT/testdir echo "Renaming $NUM_FILES files..." start=$(date +%s%N) for ((i = 1; i <= $NUM_FILES; i++)); do mv $MNT/testdir/file_$i $MNT/testdir/file_$i-RPMDELETE done end=$(date +%s%N) dur=$(( (end - start) / 1000000 )) echo "Renames took $dur milliseconds" umount $MNT Testing this change on box a using a non-debug kernel (Debian's default kernel config) gave the following results: NUM_FILES=10000, before patchset: 27399 ms NUM_FILES=10000, after patches 1/5 to 3/5 applied: 9093 ms (-66.8%) NUM_FILES=10000, after patches 1/5 to 4/5 applied: 9016 ms (-67.1%) NUM_FILES=5000, before patchset: 9241 ms NUM_FILES=5000, after patches 1/5 to 3/5 applied: 4642 ms (-49.8%) NUM_FILES=5000, after patches 1/5 to 4/5 applied: 4553 ms (-50.7%) NUM_FILES=2000, before patchset: 2550 ms NUM_FILES=2000, after patches 1/5 to 3/5 applied: 1788 ms (-29.9%) NUM_FILES=2000, after patches 1/5 to 4/5 applied: 1767 ms (-30.7%) NUM_FILES=1000, before patchset: 1088 ms NUM_FILES=1000, after patches 1/5 to 3/5 applied: 905 ms (-16.9%) NUM_FILES=1000, after patches 1/5 to 4/5 applied: 883 ms (-18.8%) The next patch in the series (5/5), also contains dbench results after applying to whole patchset. Link: https://bugzilla.opensuse.org/show_bug.cgi?id=1193549Signed-off-by: NFilipe Manana <fdmanana@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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由 Filipe Manana 提交于
When doing a rename of a file, if the file or its old parent directory were logged before, we log the new name of the file and then make sure we log the old parent directory, to ensure that after a log replay the old name of the file is deleted and the new name added. The logging of the old parent directory can take some time, because it will scan all leaves modified in the current transaction, check which directory entries were already logged, copy the ones that were not logged before, etc. In this rename context all we need to do is make sure that the old name of the file is deleted on log replay, so instead of triggering a directory log operation, we can just delete the old directory entry from the log if it's there, or in case it isn't there, just log a range item to signal log replay that the old name must be deleted. So change btrfs_log_new_name() to do that. This scenario is actually not uncommon to trigger, and recently on a 5.15 kernel, an openSUSE Tumbleweed user reported package installations and upgrades, with the zypper tool, were often taking a long time to complete, much more than usual. With strace it could be observed that zypper was spending over 99% of its time on rename operations, and then with further analysis we checked that directory logging was happening too frequently and causing high latencies for the rename operations. Taking into account that installation/upgrade of some of these packages needed about a few thousand file renames, the slowdown was very noticeable for the user. The issue was caused indirectly due to an excessive number of inode evictions on a 5.15 kernel, about 100x more compared to a 5.13, 5.14 or a 5.16-rc8 kernel. After an inode eviction we can't tell for sure, in an efficient way, if an inode was previously logged in the current transaction, so we are pessimistic and assume it was, because in case it was we need to update the logged inode. More details on that in one of the patches in the same series (subject "btrfs: avoid inode logging during rename and link when possible"). Either way, in case the parent directory was logged before, we currently do more work then necessary during a rename, and this change minimizes that amount of work. The following script mimics part of what a package installation/upgrade with zypper does, which is basically renaming a lot of files, in some directory under /usr, to a name with a suffix of "-RPMDELETE": $ cat test.sh #!/bin/bash DEV=/dev/nvme0n1 MNT=/mnt/nvme0n1 NUM_FILES=10000 mkfs.btrfs -f $DEV mount $DEV $MNT mkdir $MNT/testdir for ((i = 1; i <= $NUM_FILES; i++)); do echo -n > $MNT/testdir/file_$i done sync # Do some change to testdir and fsync it. echo -n > $MNT/testdir/file_$((NUM_FILES + 1)) xfs_io -c "fsync" $MNT/testdir echo "Renaming $NUM_FILES files..." start=$(date +%s%N) for ((i = 1; i <= $NUM_FILES; i++)); do mv $MNT/testdir/file_$i $MNT/testdir/file_$i-RPMDELETE done end=$(date +%s%N) dur=$(( (end - start) / 1000000 )) echo "Renames took $dur milliseconds" umount $MNT Testing this change on box using a non-debug kernel (Debian's default kernel config) gave the following results: NUM_FILES=10000, before this patch: 27399 ms NUM_FILES=10000, after this patch: 9093 ms (-66.8%) NUM_FILES=5000, before this patch: 9241 ms NUM_FILES=5000, after this patch: 4642 ms (-49.8%) NUM_FILES=2000, before this patch: 2550 ms NUM_FILES=2000, after this patch: 1788 ms (-29.9%) NUM_FILES=1000, before this patch: 1088 ms NUM_FILES=1000, after this patch: 905 ms (-16.9%) Link: https://bugzilla.opensuse.org/show_bug.cgi?id=1193549Signed-off-by: NFilipe Manana <fdmanana@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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由 Filipe Manana 提交于
In the next patch in the series, there will be the need to access the old name, and its length, of an inode when logging the inode during a rename. So instead of passing the inode to btrfs_log_new_name() pass the dentry, because from the dentry we can get the inode, the name and its length. This will avoid passing 3 new parameters to btrfs_log_new_name() in the next patch - the name, its length and an index number. This way we end up passing only 1 new parameter, the index number. Signed-off-by: NFilipe Manana <fdmanana@suse.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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