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The member btrfs_chunk_map::stripe_size sounds very similar to btrfs_chunk::stripe_len, but they have very different meanings. btrfs_chunk_map::stripe_size is in fact the device extent size for the chunk. E.g. a 2GiB RAID0 chunk with 2 stripes, btrfs_chunk_map::stripe_size will be 1GiB (2GiB / 2). But btrfs_chunk::stripe_len is the stripe length that striping profiles should follow, and the value is now fixed to 64KiB. E.g. for a 2GiB RAID0 chunk with 2 stripes, every write will be split into 64KiB stripes, and then distributed across the 2 devices. To avoid confusion, rename btrfs_chunk_map::stripe_size to dev_extent_size. And since we're here, also rename the helper btrfs_calc_stripe_length() to btrfs_calc_dev_extent_size(). Reviewed-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Rename the "stripe_size" used inside volumes.c by: - local variable in alloc_virtual_chunk() - alloc_chunk_ctl::stripe_size All rename to "dev_extent_size". - alloc_chunk_ctl::max_stripe_size Rename to "dev_extent_max" as there is already a "dev_extent_min". - decide_stripe_size*() functions Rename to decide_dev_extent_size*(). This further reduces the confusion between "stripe_size" and "stripe_len". Reviewed-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
During read_one_chunk() we can hit an existing chunk map. There are several situations that this can happen: - System chunk maps This is the most common case, where the system chunks are added from super block during bootstrap. But in that case, the system chunks in the super block should match the one in the chunk tree, if not there is definitely something wrong. - Overlapping chunk maps This is rare, but potentially malicious. Crafted images or even some bitflips in the chunk tree can lead to this. In that case we should reject such cases. To detect and reject those cases: - Introduce a new helper, is_same_chunk_map() This checks most important members, so we can detect such problem without fully checking the stripes. If the helper returns false, then we output an error message and reject the mount. - Use the full chunk map range for btrfs_find_chunk_map() The current search range is [@logical, @logical], which is only one bytenr in length. If we have the following case, btrfs_find_chunk_map() returns NULL but we still have an overlapping chunk map: Logical |<--- New chunk map --->| |<--- Existing chunk map --->| Using the full range to do the search would return the existing chunk map and get the new one rejected. Reviewed-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Since commit 3eaf5f0 ("btrfs: extract inlined creation into a dedicated delalloc helper"), even for inlined compressed extents the cb range will be exact one block, aka [0, sector). And several attempts to bring back the old compression range [0, i_size] all failed with extra races against i_size. So I think the behavior will stay. With that said, we can further simplify the lzo compression path. Since the range is always aligned to block size, and lzo compression is already done block by block, there is no reason to handle sub-block sized range. We can safely remove the @sectorsize_mask, @sector_off and @in_len variables, and always use @sectorsize as input length for each compression iteration. Finally add two ASSERT()s to make sure the range passed into btrfs_compress_bio() is always block aligned. Reviewed-by: Daniel Vacek <neelx@suse.com> Signed-off-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
In init_scrub_stripe() we are allocating a stripe's buffer with GFP_NOFS but we can use GFP_KERNEL instead since we are not holding a transaction handle or any locks that could cause a deadlock if GFP_KERNEL triggers a transaction commit. So switch to GFP_KERNEL. We are also doing GFP_KERNEL for the allocation of stripe->csums just a few lines below. Reviewed-by: Qu Wenruo <wqu@suse.com> Signed-off-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
…s finishing When scrub finishes, it does a wakeup on the fs_info->scrub_pause_wait wait queue and then sets dev->scrub_sctx to NULL. On the other hand the scrub cancel code (btrfs_scrub_cancel_dev()) waits on that wait queue for dev->scrub_sctx to be NULL. So this means if btrfs_scrub_cancel_dev() is called right when scrub is finishing and sees the wakeup before the NULL is assigned to dev->scrub_sctx by btrfs_scrub_dev(), it hangs. Fix this by doing the wakeup in btrfs_scrub_dev() after setting dev->scrub_sctx to NULL. Fixes: a2de733 ("btrfs: scrub") Reviewed-by: Qu Wenruo <wqu@suse.com> Signed-off-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
It's not used since commit 001e3fc ("btrfs: scrub: remove scrub_block and scrub_sector structures"), so remove it. Reviewed-by: Daniel Vacek <neelx@suse.com> Signed-off-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
…s ioctl If the scrub progress ioctl is called when replace is about to finish, we have a race that can result in a use-after-free of the scrub context: 1) A scrub is finishing and is at btrfs_scrub_dev(); 2) A concurrent task called the scrub progress ioctl and is in btrfs_scrub_progress(), where it takes the device_list_mutex and grabs the device. Then it starts using the device's scrub context (for a memcpy operation); 3) While the scrub progress ioctl task is running, the scrub task sets the device's scrub_ctx to NULL (acquiring fs_info->scrub_lock) and then calls scrub_put_ctx() against the scrub context, dropping the last reference and freeing the memory - while the scrub progress ioctl task is still using it, resulting in a use-after-free. Fix this by changing btrfs_scrub_progress() to take fs_info->scrub_lock before using the scrub context. Reviewed-by: Qu Wenruo <wqu@suse.com> Reviewed-by: Daniel Vacek <neelx@suse.com> Signed-off-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
The scrub progress ioctl is copying the scrub progress stats without acquiring the spinlock that protects it and a concurrent scrub can be updating the stats at the same time which can lead to load tearing issues. So take the spinlock when copying the progress stats. Reviewed-by: Qu Wenruo <wqu@suse.com> Reviewed-by: Daniel Vacek <neelx@suse.com> Signed-off-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Commit 6ded22c ("btrfs: reduce div64 calls by limiting the number of stripes of a chunk to u32") introduced a chunk size limit check, but it is using a wrong result in the comment: U32_MAX << BTRFS_STRIPE_LEN_SHIFT results 256T, not 256G. Instead of calculating the size limit, using an immediate number (SZ_256G). This has the following benefit: - Still large enough for future expansion Although the check is 1024 times more strict, I don't think we will allow 256G chunk anytime soon. And we have higher chance (10 more bits) to catch a bitflip in the high bits. - Much harder to diverge from the comment We don't need to calculate the number anymore. Signed-off-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
When deleting a subvolume by ID, btrfs_ioctl_snap_destroy() first resolves the requested ID to a name, then looks up that name again under the parent directory lock. A concurrent rename can change which subvolume is associated with the name between these operations. Since the deletion path does not verify the ID of the resolved subvolume, it can delete a different subvolume while leaving the requested one intact. This was reproduced by repeatedly exchanging the names of two subvolumes using renameat2(RENAME_EXCHANGE) while deleting one of them by ID. The wrong subvolume was deleted in 9 out of 14 independent tests. Fix this by checking that the resolved subvolume ID matches the requested ID while holding the parent directory lock. Return -EAGAIN on a mismatch so that userspace can retry the operation instead of being told that the requested subvolume does not exist. Fixes: 949964c ("btrfs: add new BTRFS_IOC_SNAP_DESTROY_V2 ioctl") CC: stable@vger.kernel.org Reviewed-by: Qu Wenruo <wqu@suse.com> Signed-off-by: guolingxing <guolingxing@tju.edu.cn> Signed-off-by: David Sterba <dsterba@suse.com>
btrfs_ioctl_defrag() checks MAY_WRITE against nop_mnt_idmap, so on an idmapped mount the owner comparison uses the caller's fsuid against the raw on-disk uid and the ioctl fails with -EPERM even for the file's owner. Pass the mount idmap down so defrag works on idmapped mounts. The check, added in 616d374 ("btrfs: allow defrag on a file opened read-only that has rw permissions"), is not a privilege gate. It only tests whether the file could have been opened for writing, and a user who owns the file on the idmapped mount can already open it O_RDWR, write() to it or fallocate() it. Defragmenting a regular file only rearranges the caller's own extents; there is nothing it can rewrite that the caller could not rewrite anyway. Whole-subvolume defrag on a directory keeps its capable(CAP_SYS_ADMIN) requirement, and the !capable() guard around this check is left as is. FIDEDUPERANGE already works this way for unprivileged callers: may_dedupe_file() in fs/remap_range.c compares the inode owner through file_mnt_idmap(file) and falls back to inode_permission() with the same idmap, and dedupe can rewrite one file's extents from another file's contents, which is a stronger operation than defrag. On regular mounts file_mnt_idmap() is nop_mnt_idmap and nothing changes. Reviewed-by: Seth Forshee <sforshee@kernel.org> Reviewed-by: Qu Wenruo <wqu@suse.com> Reviewed-by: Christian Brauner (Amutable) <brauner@kernel.org> Signed-off-by: Tao Cui <cuitao@kylinos.cn> Signed-off-by: David Sterba <dsterba@suse.com>
…ation btrfs_zone_activate() unconditionally decrements the reserved_active_zones counter regardless if btrfs_dev_set_active_zone() fails to set the zone active, i.e. because it raced with another call that already set the bit in the bitmask, or not. This can lead to a double decrement of the counter in case the bit has already been set. Only decrement the counter *iff* btrfs_dev_set_active_zone() successfully marked the zone in the bitmap. Mirror this behaviour when clearing the bit again. Reviewed-by: Daniel Vacek <neelx@suse.com> Fixes: a7e1ac7 ("btrfs: zoned: reserve zones for an active metadata/system block group") Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
wait_eb_writebacks() iterates the fs_info->buffer_tree xarray and waits for the writeback of these extent-buffers. Waiting for writeback needs to be done without the rcu_read_lock() held (because it can sleep) and thus the loop drops the rcu_read_lock() before calling into wait_on_extent_buffer_writeback(). But extent_buffers are freed through RCU, so if btrfs_release_extent_buffer_rcu() is scheduled while we're still waiting on the writeback, the extent_buffer will be freed causing a use-after-free. Similar to what is done in find_extent_buffer_nolock(), get a reference to the extent_buffer before calling into wait_on_extent_buffer_writeback() so a sucessfull writeback does not free the extent_buffer while we still have a reference to it. Reviewed-by: Daniel Vacek <neelx@suse.com> Fixes: 2dd7e7b ("btrfs: zoned: wait for extent buffer IOs before finishing a zone") Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
btrfs_reset_unused_block_groups() drops the block-group from fs_info->unused_bgs before performing the work that can actually fail, the actual submission of a REQ_OP_ZONE_RESET. Every failed operation after this leaves the block-group dangling, physically reset, but the in-memory structures aren't and it is not requeued to be reset on fs_info->unused_bgs. Instead of bailing out, re-add this block-group to fs_info->unused_bgs list. Reviewed-by: Daniel Vacek <neelx@suse.com> Fixes: 453a73c ("btrfs: zoned: reclaim unused zone by zone resetting") Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
The two functions btrfs_free_reserved_bytes() and btrfs_reset_unused_block_groups() both manipulate space_info->bytes_zone_unusable without using the accessor function btrfs_space_info_update_bytes_zone_unusable() potentially risking an underflow (in case of btrfs_reset_unused_block_groups()). Use btrfs_space_info_update_bytes_zone_unusable() in both function, in the case of btrfs_free_reserved_bytes() it is mostly for documenting purposes. Reviewed-by: Daniel Vacek <neelx@suse.com> Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
The on-disk btrfs_chunk structure uses u16 for both num_stripes and sub_stripes, so there is no need to use "int" to represent them in btrfs_chunk_map. Follow the on-disk format to use u16 for those members, including verified_stripes too. And since verified_stripes is u16, it no longer completely fill the hole between @refs and @start. Instead use @num_stripes and @sub_stripes to fill the hole, and leave a 6 bytes hole between @verified_stripes and @stripes. This doesn't save any space for btrfs_chunk_map, but leaves enough space for future expansion. Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: Qu Wenruo <wqu@suse.com>
Currently btrfs doesn't load btrfs_chunk::stripe_len into btrfs_chunk_map, as tree-checker will reject any chunk whose stripe_len is not 64K. But for the future we will want stripe length other than 64K. As a preparation for the variable stripe length in the future, load btrfs_chunk::stripe_len into btrfs_chunk_map::stripe_len and stripe_shift. For now stripe_len is still 64K, no matter if it's loaded from the on-disk metadata or newly allocated chunk. As tree-checker still rejects any chunk whose stripe_len is not 64K. The two new members fit into the existing hole of btrfs_chunk_map, so the size of btrfs_chunk_map stay the same. Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: Qu Wenruo <wqu@suse.com>
The new member will be utilized by various path that no direct btrfs_chunk_map is available, but a stripe length is still required. The new member is located inside a hole between @refs and @fs_info, so no size increase for btrfs_io_context. Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: Qu Wenruo <wqu@suse.com>
Several points to note: - scrub_ctx::stripes[] stripe_len updates We always pre-initialize scrub_ctx::stripes[] at the very beginning of scrub, without holding any btrfs_chunk_map. So init_scrub_stripe() still uses BTRFS_STRIPE_LEN, and all allocated memory are based on that stripe length. But before scrubbing each chunk, update_scrub_stripe_len() will be called to update the scrub_stripe::stripe_len. - Stripe_len should not exceed BTRFS_STRIPE_LEN Since scrub_stripe's heap memory are all based on BTRFS_STRIPE_LEN, any stripe_len larger than BTRFS_STRIPE_LEN will cause access-beyond-boundary. Thankfully there is no plan to support such stripe_len > BTRFS_STRIPE_LEN any time soon. - alloc_scrub_bbio() changes Previously we ensure BTRFS_STRIPE_LEN >= PAGE_SIZE, so BTRFS_STRIPE_LEN >> PAGE_SHIFT can never be zero. But now stripe_len can be smaller than PAGE_SIZE. E.g. stripe_len 4K, page size 64K. So we have to use "round_up(stripe_len, PAGE_SIZE) >> PAGE_SHIFT" instead. Finally alloc_scrub_bbio() is always called with a scrub_stripe pointer as the @Private parameter, change the type from (void *) to (struct scrub_stripe *), so that we can grab the stripe_len without a new parameter. Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: Qu Wenruo <wqu@suse.com>
That helper is currently using a fixed BTRFS_STRIPE_LEN, change it to accept a 'u32 stripe_len'. Also add an ASSERT() to make sure the @stripe_len passed in is power of 2, and no larger than BTRFS_STRIPE_LEN. There is a special case where we still pass BTRFS_STRIPE_LEN into btrfs_stripe_nr_to_offset(), that's for chunk allocation to determine the minimal device extent size. In that case, since our future planned map->stripe_len is always power of 2 and no larger than BTRFS_STRIPE_LEN, we are totally fine to use the old BTRFS_STRIPE_LEN. Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: Qu Wenruo <wqu@suse.com>
There are still some BTRFS_STRIPE_LEN usage remaining, but they are all for chunk allocation. There is one more refactor for is_same_chunk_map(), as there are more members to compare, the parameter list can go longer and longer. Instead of passing a new @stripe_len member, pass extent_buffer and btrfs_chunk pointers, and grab the needed member inside that function. And doing "if (unlikely()) return false" for each member check. Although this make is_same_chunk_map() more complex, considering it's only called for system chunks, it should not bring too much overhead. Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: Qu Wenruo <wqu@suse.com>
So that raid56 can support stripe length other than BTRFS_STRIPE_LEN. There are several extra things to note: - btrfs_raid_bio::stripe_npages is removed With stripe_len < BTRFS_STRIPE_LEN, there is no guarantee that a page won't cross multiple stripes. E.g. with 4K stripe_len and sectorsize, 2 data stripes, with 64K page size, one page will cover the full stripe. So stripe_npages no longer makes sense, just remove it. - alloc_rbio_data_pages()/alloc_rbio_parity_pages() fallback For the same above reason, a page can contain both data and parity blocks. In that case we can no longer only allocate pages for data/parity. Add a fallback that if stripe_len is smaller than page size, always allocate all the pages. This is not the best solution, but should be good enough for now until the variable stripe_len is properly tested. - steal_rbio() fallback If stripe_len is smaller than PAGE_SIZE, it's hard to only steal the data pages. Again skip the stealing if stripe_len is smaller than PAGE_SIZE. Reviewed-by: Johannes Thusmhirn <johannes.thumshirn@wdc.com> Signed-off-by: Qu Wenruo <wqu@suse.com>
There are still several call sites using BTRFS_STRIPE_LEN, but that's when doing the basic zoned checks. For other call sites with a btrfs_chunk_map, use map->stripe_len instead of the hardcoded BTRFS_STRIPE_LEN. And since we're here, replace the following pattern if (val & BTRFS_STRIPE_LEN_MASK) with if (!IS_ALIGNED(val, stripe_len)) Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: Qu Wenruo <wqu@suse.com>
The new limits are: - Stripe_len must be no smaller than sectorsize As sectorsize is still the minimal unit. - Stripe_len must be no larger than BTRFS_STRIPE_LEN We still have a lot of things requiring on BTRFS_STRIPE_LEN alignment, e.g. dev extent and chunk allocation. A stripe_len larger than BTRFS_STRIPE_LEN will cause problems for the existing chunk allocator. Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: Qu Wenruo <wqu@suse.com>
There are several BUG()/BUG_ON() inside raid56.c, which cause checkpatch warning if code is touching them. This is especially annoying if using b4, with btrfs-workflow git hooks applied, which makes b4 to wait for user input but without any output. Address them by removing one very impossible BUG(), and using ASSERT() for the remaining ones: - __remove_rbio_from_cache() - rbio_is_full() - unlock_stripe() Replace the BUG_ON() with ASSERT(). - finish_parity_scrub() Remove the BUG(), as alloc_rbio() has already properly calculated real_stripes and nr_data using the number of parity. Furthermore, initialize @has_qstripe at the beginning of the function using the bioc->map_type directly. Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: Qu Wenruo <wqu@suse.com>
An extent in a block-group that uses the RAID stripe-tree has its logical to physical mapping stored in that tree, which only becomes persistent when the stripe-tree is written out at transaction commit. But the RAID stripe-tree is not logged in the log tree. A fsync therefore logs a file-extent item whose logical range cannot be resolved after a crash. Replay restores the file-extent item and the file has the correct size, but reading it fails with EIO and nothing is reported. Force a full commit when logging such an extent. Extents reach the log both from log_one_extent() and from copy_items(), so check in both. copy_items() skips extents from a past transaction, their mapping is already committed, the same reason their checksums are not logged. Fixes: 02c372e ("btrfs: add support for inserting raid stripe extents") Reviewed-by: Filipe Manana <fdmanana@suse.com> Reviewed-by: Qu Wenruo <wqu@suse.com> Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
When using the no-holes feature (enabled by default since btrfs-progs v5.15) and doing an incremental send, we can miss issuing a hole punching command when the following conditions happen: 1) A hole is punched in a tail section of a file extent item that happens to be the last item in a leaf (for example the extent covers the file range [1M, 3M) and a hole is punched in the range [2M, 3M)). Between the end of this file extent item's range and the i_size, there are other file extent items; 2) The next leaf was not modified in the send snapshot, remaining shared with the parent snapshot. In this scenario we are unable to detect a hole was punched and never issue a hole punch command because with no-holes there we don't have an explicit file extent item to mark a hole. Fix this by teaching maybe_send_hole() to detect such case. A test case for fstests will follow soon. Reported-by: Tristan Elvers <tristanelvers@gmail.com> Link: https://lore.kernel.org/linux-btrfs/CAFoLKK+aErV4p6ZJPnVeH5SHQ5++0f=8ZgxPWe-E-CkeKBs8PA@mail.gmail.com/ Fixes: 16e7549 ("Btrfs: incompatible format change to remove hole extents") Reviewed-by: Qu Wenruo <wqu@suse.com> Signed-off-by: Filipe Manana <fdmanana@suse.com>
…e_info() There's no point in setting the block group's space_info member as the space_info was extracted from the block group early when the variable was declared and did not change. Reviewed-by: Qu Wenruo <wqu@suse.com> Signed-off-by: Filipe Manana <fdmanana@suse.com>
It's not used, so remove it. Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: Filipe Manana <fdmanana@suse.com>
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