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Fri, 5 Apr 2024 03:27:35 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap2.dmz-prg2.suse.org with ESMTPSA id GE3tNKdvD2a+aQAAn2gu4w (envelope-from ) for ; Fri, 05 Apr 2024 03:27:35 +0000 From: Qu Wenruo To: linux-btrfs@vger.kernel.org Subject: [PATCH v3 3/3] btrfs: add extra sanity checks for create_io_em() Date: Fri, 5 Apr 2024 13:57:13 +1030 Message-ID: <86cb1590afda8ea8659aa40009b35aa5130fa214.1712287421.git.wqu@suse.com> X-Mailer: git-send-email 2.44.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-btrfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Flag: NO X-Spam-Score: -3.01 X-Rspamd-Action: no action X-Rspamd-Queue-Id: 214661F745 X-Spam-Level: X-Rspamd-Server: rspamd2.dmz-prg2.suse.org X-Spamd-Result: default: False [-3.01 / 50.00]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_CONTAINS_FROM(1.00)[]; R_MISSING_CHARSET(0.50)[]; R_DKIM_ALLOW(-0.20)[suse.com:s=susede1]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; PREVIOUSLY_DELIVERED(0.00)[linux-btrfs@vger.kernel.org]; FUZZY_BLOCKED(0.00)[rspamd.com]; FROM_EQ_ENVFROM(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; RCPT_COUNT_ONE(0.00)[1]; ARC_NA(0.00)[]; FROM_HAS_DN(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; RECEIVED_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:106:10:150:64:167:received]; RCVD_TLS_ALL(0.00)[]; TO_DN_NONE(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.com:dkim,suse.com:email]; RCVD_COUNT_TWO(0.00)[2]; MIME_TRACE(0.00)[0:+]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; DKIM_TRACE(0.00)[suse.com:+] The function create_io_em() is called before we submit an IO, to update the in-memory extent map for the involved range. This patch changes the following aspects: - Does not allow BTRFS_ORDERED_NOCOW type For real NOCOW (excluding NOCOW writes into preallocated ranges) writes, we never call create_io_em(), as we does not need to update the extent map at all. So remove the sanity check allowing BTRFS_ORDERED_NOCOW type. - Add extra sanity checks * PREALLOC - @block_len == len For uncompressed writes. * REGULAR - @block_len == @orig_block_len == @ram_bytes == @len We're creating a new uncompressed extent, and referring all of it. - @orig_start == @start We haven no offset inside the extent. * COMPRESSED - valid @compress_type - @len <= @ram_bytes This is to co-operate with encoded writes, which can cause a new file extent referring only part of a uncompressed extent. Signed-off-by: Qu Wenruo Reviewed-by: Filipe Manana --- fs/btrfs/inode.c | 40 +++++++++++++++++++++++++++++++++++++++- 1 file changed, 39 insertions(+), 1 deletion(-) diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index c6f2b5d1dee1..ced916f42bab 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -7320,11 +7320,49 @@ static struct extent_map *create_io_em(struct btrfs_inode *inode, u64 start, struct extent_map *em; int ret; + /* + * Note the missing of NOCOW type. + * + * For pure NOCOW writes, we should not create an io extent map, + * but just reusing the existing one. + * Only PREALLOC writes (NOCOW write into preallocated range) can + * create io extent map. + */ ASSERT(type == BTRFS_ORDERED_PREALLOC || type == BTRFS_ORDERED_COMPRESSED || - type == BTRFS_ORDERED_NOCOW || type == BTRFS_ORDERED_REGULAR); + switch (type) { + case BTRFS_ORDERED_PREALLOC: + /* Uncompressed extents. */ + ASSERT(block_len == len); + + /* We're only referring part of a larger preallocated extent. */ + ASSERT(block_len <= ram_bytes); + break; + case BTRFS_ORDERED_REGULAR: + /* Uncompressed extents. */ + ASSERT(block_len == len); + + /* COW results a new extent matching our file extent size. */ + ASSERT(orig_block_len == len); + ASSERT(ram_bytes == len); + + /* Since it's a new extent, we should not have any offset. */ + ASSERT(orig_start == start); + break; + case BTRFS_ORDERED_COMPRESSED: + /* Must be compressed. */ + ASSERT(compress_type != BTRFS_COMPRESS_NONE); + + /* + * Encoded write can make us to refer to part of the + * uncompressed extent. + */ + ASSERT(len <= ram_bytes); + break; + } + em = alloc_extent_map(); if (!em) return ERR_PTR(-ENOMEM);