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2020-08-23treewide: Use fallthrough pseudo-keywordGustavo A. R. Silva1-3/+3
Replace the existing /* fall through */ comments and its variants with the new pseudo-keyword macro fallthrough[1]. Also, remove unnecessary fall-through markings when it is the case. [1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
2020-08-06Merge tag 'erofs-for-5.9-rc1' of ↵Linus Torvalds16-71/+100
git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs Pull erofs updates from Gao Xiang: "This cycle mainly addresses an issue out of some extended inode with designated location, which are not generated by current mkfs but need to handled at runtime anyway. The others are quite trivial ones. - use HTTPS links instead of insecure HTTP ones; - fix crossing page boundary on specific extended inodes; - remove useless WQ_CPU_INTENSIVE flag for unbound wq; - minor cleanup" * tag 'erofs-for-5.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs: erofs: remove WQ_CPU_INTENSIVE flag from unbound wq's erofs: fold in used-once helper erofs_workgroup_unfreeze_final() erofs: fix extended inode could cross boundary erofs: Replace HTTP links with HTTPS ones
2020-08-03erofs: remove WQ_CPU_INTENSIVE flag from unbound wq'sGao Xiang1-2/+2
The documentation [1] says that WQ_CPU_INTENSIVE is "meaningless" for unbound wq. I remove this flag from places where unbound queue is allocated. This is supposed to improve code readability. [1] https://www.kernel.org/doc/html/latest/core-api/workqueue.html#flags Signed-off-by: Maksym Planeta <mplaneta@os.inf.tu-dresden.de> [Gao Xiang: since the original treewide patch [2] hasn't been merged yet, handling the EROFS part only for the next cycle. ] [2] https://lore.kernel.org/r/20200213141823.2174236-1-mplaneta@os.inf.tu-dresden.de Link: https://lore.kernel.org/r/20200731024049.16495-1-hsiangkao@aol.com Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
2020-08-03erofs: fold in used-once helper erofs_workgroup_unfreeze_final()Gao Xiang1-11/+3
It's expected that erofs_workgroup_unfreeze_final() won't be used in other places. Let's fold it to simplify the code. Link: https://lore.kernel.org/r/20200729180235.25443-1-hsiangkao@redhat.com Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
2020-08-03erofs: fix extended inode could cross boundaryGao Xiang1-42/+79
Each ondisk inode should be aligned with inode slot boundary (32-byte alignment) because of nid calculation formula, so all compact inodes (32 byte) cannot across page boundary. However, extended inode is now 64-byte form, which can across page boundary in principle if the location is specified on purpose, although it's hard to be generated by mkfs due to the allocation policy and rarely used by Android use case now mainly for > 4GiB files. For now, only two fields `i_ctime_nsec` and `i_nlink' couldn't be read from disk properly and cause out-of-bound memory read with random value. Let's fix now. Fixes: 431339ba9042 ("staging: erofs: add inode operations") Cc: <stable@vger.kernel.org> # 4.19+ Link: https://lore.kernel.org/r/20200729175801.GA23973@xiangao.remote.csb Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
2020-08-03erofs: Replace HTTP links with HTTPS onesAlexander A. Klimov16-16/+16
Rationale: Reduces attack surface on kernel devs opening the links for MITM as HTTPS traffic is much harder to manipulate. Deterministic algorithm: For each file: If not .svg: For each line: If doesn't contain `\bxmlns\b`: For each link, `\bhttp://[^# \t\r\n]*(?:\w|/)`: If neither `\bgnu\.org/license`, nor `\bmozilla\.org/MPL\b`: If both the HTTP and HTTPS versions return 200 OK and serve the same content: Replace HTTP with HTTPS. Reviewed-by: Gao Xiang <hsiangkao@redhat.com> Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Alexander A. Klimov <grandmaster@al2klimov.de> Link: https://lore.kernel.org/r/20200713130944.34419-1-grandmaster@al2klimov.de Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
2020-07-16treewide: Remove uninitialized_var() usageKees Cook2-3/+3
Using uninitialized_var() is dangerous as it papers over real bugs[1] (or can in the future), and suppresses unrelated compiler warnings (e.g. "unused variable"). If the compiler thinks it is uninitialized, either simply initialize the variable or make compiler changes. In preparation for removing[2] the[3] macro[4], remove all remaining needless uses with the following script: git grep '\buninitialized_var\b' | cut -d: -f1 | sort -u | \ xargs perl -pi -e \ 's/\buninitialized_var\(([^\)]+)\)/\1/g; s:\s*/\* (GCC be quiet|to make compiler happy) \*/$::g;' drivers/video/fbdev/riva/riva_hw.c was manually tweaked to avoid pathological white-space. No outstanding warnings were found building allmodconfig with GCC 9.3.0 for x86_64, i386, arm64, arm, powerpc, powerpc64le, s390x, mips, sparc64, alpha, and m68k. [1] https://lore.kernel.org/lkml/20200603174714.192027-1-glider@google.com/ [2] https://lore.kernel.org/lkml/CA+55aFw+Vbj0i=1TGqCR5vQkCzWJ0QxK6CernOU6eedsudAixw@mail.gmail.com/ [3] https://lore.kernel.org/lkml/CA+55aFwgbgqhbp1fkxvRKEpzyR5J8n1vKT1VZdz9knmPuXhOeg@mail.gmail.com/ [4] https://lore.kernel.org/lkml/CA+55aFz2500WfbKXAx8s67wrm9=yVJu65TpLgN_ybYNv0VEOKA@mail.gmail.com/ Reviewed-by: Leon Romanovsky <leonro@mellanox.com> # drivers/infiniband and mlx4/mlx5 Acked-by: Jason Gunthorpe <jgg@mellanox.com> # IB Acked-by: Kalle Valo <kvalo@codeaurora.org> # wireless drivers Reviewed-by: Chao Yu <yuchao0@huawei.com> # erofs Signed-off-by: Kees Cook <keescook@chromium.org>
2020-06-24erofs: fix partially uninitialized misuse in z_erofs_onlinepage_fixupGao Xiang1-10/+10
Hongyu reported "id != index" in z_erofs_onlinepage_fixup() with specific aarch64 environment easily, which wasn't shown before. After digging into that, I found that high 32 bits of page->private was set to 0xaaaaaaaa rather than 0 (due to z_erofs_onlinepage_init behavior with specific compiler options). Actually we only use low 32 bits to keep the page information since page->private is only 4 bytes on most 32-bit platforms. However z_erofs_onlinepage_fixup() uses the upper 32 bits by mistake. Let's fix it now. Reported-and-tested-by: Hongyu Jin <hongyu.jin@unisoc.com> Fixes: 3883a79abd02 ("staging: erofs: introduce VLE decompression support") Cc: <stable@vger.kernel.org> # 4.19+ Reviewed-by: Chao Yu <yuchao0@huawei.com> Link: https://lore.kernel.org/r/20200618234349.22553-1-hsiangkao@aol.com Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
2020-06-02Merge tag 'erofs-for-5.8-rc1' of ↵Linus Torvalds8-173/+136
git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs Pull erofs updates from Gao Xiang: "The most interesting part is the new mount api conversion, which is actually a old patch already pending for several cycles. And the others are recent trivial cleanups here. Summary: - Convert to use the new mount apis - Some random cleanup patches" * tag 'erofs-for-5.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs: erofs: suppress false positive last_block warning erofs: convert to use the new mount fs_context api erofs: code cleanup by removing ifdef macro surrounding
2020-06-02mm: remove the prot argument from vm_map_ramChristoph Hellwig1-1/+1
This is always PAGE_KERNEL - for long term mappings with other properties vmap should be used. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Christian Borntraeger <borntraeger@de.ibm.com> Cc: Christophe Leroy <christophe.leroy@c-s.fr> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: David Airlie <airlied@linux.ie> Cc: Gao Xiang <xiang@kernel.org> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Haiyang Zhang <haiyangz@microsoft.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: "K. Y. Srinivasan" <kys@microsoft.com> Cc: Laura Abbott <labbott@redhat.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Michael Kelley <mikelley@microsoft.com> Cc: Minchan Kim <minchan@kernel.org> Cc: Nitin Gupta <ngupta@vflare.org> Cc: Robin Murphy <robin.murphy@arm.com> Cc: Sakari Ailus <sakari.ailus@linux.intel.com> Cc: Stephen Hemminger <sthemmin@microsoft.com> Cc: Sumit Semwal <sumit.semwal@linaro.org> Cc: Wei Liu <wei.liu@kernel.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Paul Mackerras <paulus@ozlabs.org> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Will Deacon <will@kernel.org> Link: http://lkml.kernel.org/r/20200414131348.444715-19-hch@lst.de Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-06-02erofs: convert compressed files from readpages to readaheadMatthew Wilcox (Oracle)1-20/+9
Use the new readahead operation in erofs. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: William Kucharski <william.kucharski@oracle.com> Reviewed-by: Chao Yu <yuchao0@huawei.com> Acked-by: Gao Xiang <gaoxiang25@huawei.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Cong Wang <xiyou.wangcong@gmail.com> Cc: Darrick J. Wong <darrick.wong@oracle.com> Cc: Eric Biggers <ebiggers@google.com> Cc: Jaegeuk Kim <jaegeuk@kernel.org> Cc: John Hubbard <jhubbard@nvidia.com> Cc: Joseph Qi <joseph.qi@linux.alibaba.com> Cc: Junxiao Bi <junxiao.bi@oracle.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Zi Yan <ziy@nvidia.com> Cc: Johannes Thumshirn <johannes.thumshirn@wdc.com> Cc: Miklos Szeredi <mszeredi@redhat.com> Link: http://lkml.kernel.org/r/20200414150233.24495-20-willy@infradead.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-06-02erofs: convert uncompressed files from readpages to readaheadMatthew Wilcox (Oracle)2-26/+15
Use the new readahead operation in erofs Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: William Kucharski <william.kucharski@oracle.com> Reviewed-by: Chao Yu <yuchao0@huawei.com> Acked-by: Gao Xiang <gaoxiang25@huawei.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Cong Wang <xiyou.wangcong@gmail.com> Cc: Darrick J. Wong <darrick.wong@oracle.com> Cc: Dave Chinner <dchinner@redhat.com> Cc: Eric Biggers <ebiggers@google.com> Cc: Jaegeuk Kim <jaegeuk@kernel.org> Cc: John Hubbard <jhubbard@nvidia.com> Cc: Joseph Qi <joseph.qi@linux.alibaba.com> Cc: Junxiao Bi <junxiao.bi@oracle.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Zi Yan <ziy@nvidia.com> Cc: Johannes Thumshirn <johannes.thumshirn@wdc.com> Cc: Miklos Szeredi <mszeredi@redhat.com> Link: http://lkml.kernel.org/r/20200414150233.24495-19-willy@infradead.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-05-29erofs: suppress false positive last_block warningGao Xiang1-2/+2
As Andrew mentioned, some rare specific gcc versions could report last_block uninitialized warning. Actually last_block doesn't need to be uninitialized first from its implementation due to bio == NULL condition. After a bio is allocated, last_block will be assigned then. The detailed analysis is in this thread [1]. So let's silence those confusing gccs simply. [1] https://lore.kernel.org/r/20200421072839.GA13867@hsiangkao-HP-ZHAN-66-Pro-G1 Cc: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Chao Yu <yuchao0@huawei.com> Link: https://lore.kernel.org/r/20200528084844.23359-1-hsiangkao@redhat.com Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
2020-05-29erofs: convert to use the new mount fs_context apiChao Yu4-156/+132
Convert the erofs to use new internal mount API as the old one will be obsoleted and removed. This allows greater flexibility in communication of mount parameters between userspace, the VFS and the filesystem. See Documentation/filesystems/mount_api.txt for more information. Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: David Howells <dhowells@redhat.com> Signed-off-by: Chao Yu <yuchao0@huawei.com> Link: https://lore.kernel.org/r/20200529104836.17843-1-hsiangkao@redhat.com Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
2020-05-27erofs: code cleanup by removing ifdef macro surroundingChengguang Xu4-16/+3
Define erofs_listxattr and erofs_xattr_handlers to NULL when CONFIG_EROFS_FS_XATTR is not enabled, then we can remove many ugly ifdef macros in the code. Signed-off-by: Chengguang Xu <cgxu519@mykernel.net> Reviewed-by: Gao Xiang <hsiangkao@redhat.com> Reviewed-by: Chao Yu <yuchao0@huawei.com> Link: https://lore.kernel.org/r/20200526090343.22794-1-cgxu519@mykernel.net Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
2020-03-03erofs: handle corrupted images whose decompressed size less than it'd beGao Xiang1-3/+7
As Lasse pointed out, "Looking at fs/erofs/decompress.c, the return value from LZ4_decompress_safe_partial is only checked for negative value to catch errors. ... So if I understood it correctly, if there is bad data whose uncompressed size is much less than it should be, it can leave part of the output buffer untouched and expose the previous data as the file content. " Let's fix it now. Cc: Lasse Collin <lasse.collin@tukaani.org> Fixes: 7fc45dbc938a ("staging: erofs: introduce generic decompression backend") [ Gao Xiang: v5.3+, I will manually backport this to stable later. ] Link: https://lore.kernel.org/r/20200226081008.86348-3-gaoxiang25@huawei.com Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
2020-03-03erofs: use LZ4_decompress_safe() for full decodingGao Xiang1-3/+9
As Lasse pointed out, "EROFS uses LZ4_decompress_safe_partial for both partial and full blocks. Thus when it is decoding a full block, it doesn't know if the LZ4 decoder actually decoded all the input. The real uncompressed size could be bigger than the value stored in the file system metadata. Using LZ4_decompress_safe instead of _safe_partial when decompressing a full block would help to detect errors." So it's reasonable to use _safe in case of potential corrupted images and it might have some speed gain as well although I didn't observe much difference. Note that legacy compressor (< 5.3, no LZ4_0PADDING) could encode extra data in a pcluster, which is excluded as well. Cc: Lasse Collin <lasse.collin@tukaani.org> Fixes: 0ffd71bcc3a0 ("staging: erofs: introduce LZ4 decompression inplace") [ Gao Xiang: v5.3+, I will manually backport this to stable later. ] Link: https://lore.kernel.org/r/20200226081008.86348-2-gaoxiang25@huawei.com Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
2020-03-03erofs: correct the remaining shrink objectsGao Xiang1-1/+1
The remaining count should not include successful shrink attempts. Fixes: e7e9a307be9d ("staging: erofs: introduce workstation for decompression") Cc: <stable@vger.kernel.org> # 4.19+ Link: https://lore.kernel.org/r/20200226081008.86348-1-gaoxiang25@huawei.com Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
2020-03-03erofs: convert workstn to XArrayGao Xiang4-98/+76
XArray has friendly APIs and it will replace the old radix tree in the near future. This convert makes use of __xa_cmpxchg when inserting on a just inserted item by other thread. In detail, instead of totally looking up again as what we did for the old radix tree, it will try to legitimize the current in-tree item in the XArray therefore more effective. In addition, naming is rather a challenge for non-English speaker like me. The basic idea of workstn is to provide a runtime sparse array with items arranged in the physical block number order. Such items (was called workgroup) can be used to record compress clusters or for later new features. However, both workgroup and workstn seem not good names from whatever point of view, so I'd like to rename them as pslot and managed_pslots to stand for physical slots. This patch handles the second as a part of the radix tree convert. Cc: Matthew Wilcox <willy@infradead.org> Link: https://lore.kernel.org/r/20200220024642.91529-1-gaoxiang25@huawei.com Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
2020-01-21erofs: clean up z_erofs_submit_queue()Gao Xiang1-55/+40
A label and extra variables will be eliminated, which is more cleaner. Link: https://lore.kernel.org/r/20200121064819.139469-1-gaoxiang25@huawei.com Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
2020-01-21erofs: fold in postsubmit_is_all_bypassed()Gao Xiang1-16/+7
No need to introduce such separated helper since cache strategy compile configs were changed into runtime options instead in v5.4. No logic changes. Link: https://lore.kernel.org/r/20200121064747.138987-1-gaoxiang25@huawei.com Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
2020-01-11erofs: fix out-of-bound read for shifted uncompressed blockGao Xiang1-12/+10
rq->out[1] should be valid before accessing. Otherwise, in very rare cases, out-of-bound dirty onstack rq->out[1] can equal to *in and lead to unintended memmove behavior. Link: https://lore.kernel.org/r/20200107022546.19432-1-gaoxiang25@huawei.com Fixes: 7fc45dbc938a ("staging: erofs: introduce generic decompression backend") Cc: <stable@vger.kernel.org> # 5.3+ Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
2020-01-07erofs: remove void tagging/untagging of workgroup pointersVladimir Zapolskiy1-7/+2
Because workgroup pointers inserted to a radix tree are always tagged with a single value of 0, it is possible to remove tagging and untagging of the pointers completely. Signed-off-by: Vladimir Zapolskiy <vladimir@tuxera.com> Link: https://lore.kernel.org/r/20200102120118.14979-4-vladimir@tuxera.com Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
2020-01-07erofs: remove unused tag argument while registering a workgroupVladimir Zapolskiy3-5/+4
All workgroups are registered with tag value set to 0, to simplify erofs_register_workgroup() interface the tag argument can be removed, if its only value is sent down to the function body. Signed-off-by: Vladimir Zapolskiy <vladimir@tuxera.com> Link: https://lore.kernel.org/r/20200102120118.14979-3-vladimir@tuxera.com Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
2020-01-07erofs: remove unused tag argument while finding a workgroupVladimir Zapolskiy3-5/+3
It is feasible to simplify erofs_find_workgroup() interface by removing an unused function argument. While formally the argument is used in the function itself, its assigned value is ignored on the caller side. Signed-off-by: Vladimir Zapolskiy <vladimir@tuxera.com> Link: https://lore.kernel.org/r/20200102120118.14979-2-vladimir@tuxera.com Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
2020-01-07erofs: correct indentation of an assigned structure inside a functionVladimir Zapolskiy1-8/+9
Trivial change, the expected indentation ruled by the coding style hasn't been met. Signed-off-by: Vladimir Zapolskiy <vladimir@tuxera.com> Link: https://lore.kernel.org/r/20200102120232.15074-1-vladimir@tuxera.com Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
2019-12-11Merge tag 'erofs-for-5.5-rc2-fixes' of ↵Linus Torvalds1-0/+2
git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs Pull erofs fixes from Gao Xiang: "Mainly address a regression reported by David recently observed together with overlayfs due to the improper return value of listxattr() without xattr. Update outdated expressions in document as well. Summary: - Fix improper return value of listxattr() with no xattr - Keep up documentation with latest code" * tag 'erofs-for-5.5-rc2-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs: erofs: update documentation erofs: zero out when listxattr is called with no xattr
2019-12-04erofs: zero out when listxattr is called with no xattrGao Xiang1-0/+2
As David reported [1], ENODATA returns when attempting to modify files by using EROFS as an overlayfs lower layer. The root cause is that listxattr could return unexpected -ENODATA by mistake for inodes without xattr. That breaks listxattr return value convention and it can cause copy up failure when used with overlayfs. Resolve by zeroing out if no xattr is found for listxattr. [1] https://lore.kernel.org/r/CAEvUa7nxnby+rxK-KRMA46=exeOMApkDMAV08AjMkkPnTPV4CQ@mail.gmail.com Link: https://lore.kernel.org/r/20191201084040.29275-1-hsiangkao@aol.com Fixes: cadf1ccf1b00 ("staging: erofs: add error handling for xattr submodule") Cc: <stable@vger.kernel.org> # 4.19+ Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
2019-11-24erofs: remove unnecessary output in erofs_show_options()Chengguang Xu1-3/+0
We have already handled cache_strategy option carefully, so incorrect setting could not pass option parsing. Meanwhile, print 'cache_strategy=(unknown)' can cause failure on remount. Link: https://lore.kernel.org/r/20191119115049.3401-1-cgxu519@mykernel.net Signed-off-by: Chengguang Xu <cgxu519@mykernel.net> Reviewed-by: Gao Xiang <gaoxiang25@huawei.com> Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
2019-11-24erofs: drop all vle annotations for runtime namesGao Xiang3-50/+44
VLE was an old informal name of fixed-sized output compression which came from published ATC'19 paper [1]. Drop those old annotations since erofs can handle all encoded clusters in block-aligned basis, which is wider than fixed-sized output compression after larger clustersize feature is fully implemented. Unaligned encoding won't be considered in EROFS since it's not friendly to inplace I/O and perhaps decompression inplace. a) Fixed-sized output compression with 16KB pcluster: ___________________________________ |xxxxxxxx|xxxxxxxx|xxxxxxxx|xxxxxxxx| |___ 0___|___ 1___|___ 2___|___ 3___| physical blocks b) Block-aligned fixed-sized input compression with 16KB pcluster: ___________________________________ |xxxxxxxx|xxxxxxxx|xxxxxxxx|xxx00000| |___ 0___|___ 1___|___ 2___|___ 3___| physical blocks c) Block-unaligned fixed-sized input compression with 16KB compression unit: ____________________________________________ |..xxxxxx|xxxxxxxx|xxxxxxxx|xxxxxxxx|x.......| |___ 0___|___ 1___|___ 2___|___ 3___|___ 4___| physical blocks Refine better names for those as well. [1] https://www.usenix.org/conference/atc19/presentation/gao Link: https://lore.kernel.org/r/20191108033733.63919-1-gaoxiang25@huawei.com Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
2019-11-24erofs: support superblock checksumPratik Shinde4-3/+38
Introduce superblock checksum feature in order to check at mounting time. Note that the first 1024 bytes are ignore for x86 boot sectors and other oddities. Link: https://lore.kernel.org/r/20191104024937.113939-1-gaoxiang25@huawei.com Signed-off-by: Pratik Shinde <pratikshinde320@gmail.com> Reviewed-by: Chao Yu <yuchao0@huawei.com> Cc: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
2019-11-24erofs: set iowait for sync decompressionGao Xiang1-2/+2
For those tasks waiting I/O for sync decompression, they should be better marked as IO wait state. Link: https://lore.kernel.org/r/20191008125616.183715-5-gaoxiang25@huawei.com Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
2019-11-24erofs: clean up decompress queue stuffsGao Xiang2-81/+60
Previously, both z_erofs_unzip_io and z_erofs_unzip_io_sb record decompress queues for backend to use. The only difference is that z_erofs_unzip_io is used for on-stack sync decompression so that it doesn't have a super block field (since the caller can pass it in its context), but it increases complexity with only a pointer saving. Rename z_erofs_unzip_io to z_erofs_decompressqueue with a fixed super_block member and kill the other entirely, and it can fallback to sync decompression if memory allocation failure. Link: https://lore.kernel.org/r/20191008125616.183715-4-gaoxiang25@huawei.com Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
2019-11-24erofs: get rid of __stagingpage_alloc helperGao Xiang4-24/+21
Now open code is much cleaner due to iterative development. Link: https://lore.kernel.org/r/20191124025217.12345-1-hsiangkao@aol.com Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
2019-10-16erofs: remove dead code since managed cache is now built-inGao Xiang2-28/+10
After commit 4279f3f9889f ("staging: erofs: turn cache strategies into mount options"), cache strategies are changed into mount options rather than old build configs. Let's kill useless code for obsoleted build options. Link: https://lore.kernel.org/r/20191008125616.183715-2-gaoxiang25@huawei.com Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
2019-10-16erofs: clean up collection handling routinesGao Xiang1-22/+25
- change return value to int since collection is already returned within the collector. - better function naming. Link: https://lore.kernel.org/r/20191008125616.183715-1-gaoxiang25@huawei.com Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
2019-10-01erofs: fix mis-inplace determination related with noio chainGao Xiang1-2/+10
Fix a recent cleanup patch. noio (bypass) chain is handled asynchronously against submit chain, therefore inplace I/O or pagevec cannot be applied to such pages. Add detailed comment for this as well. Fixes: 97e86a858bc3 ("staging: erofs: tidy up decompression frontend") Reviewed-by: Chao Yu <yuchao0@huawei.com> Link: https://lore.kernel.org/r/20190922100434.229340-1-gaoxiang25@huawei.com Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
2019-10-01erofs: fix erofs_get_meta_page locking due to a cleanupGao Xiang1-3/+7
After doing more drop_caches stress test on our products, I found the mistake introduced by a very recent cleanup [1]. The current rule is that "erofs_get_meta_page" should be returned with page locked (although it's mostly unnecessary for read-only fs after pages are PG_uptodate), but a fix should be done for this. [1] https://lore.kernel.org/r/20190904020912.63925-26-gaoxiang25@huawei.com Fixes: 618f40ea026b ("erofs: use read_cache_page_gfp for erofs_get_meta_page") Reviewed-by: Chao Yu <yuchao0@huawei.com> Link: https://lore.kernel.org/r/20190921184355.149928-1-gaoxiang25@huawei.com Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
2019-10-01erofs: fix return value check in erofs_read_superblock()Wei Yongjun1-2/+2
In case of error, the function read_mapping_page() returns ERR_PTR() not NULL. The NULL test in the return value check should be replaced with IS_ERR(). Fixes: fe7c2423570d ("erofs: use read_mapping_page instead of sb_bread") Reviewed-by: Gao Xiang <gaoxiang25@huawei.com> Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com> Link: https://lore.kernel.org/r/20190918083033.47780-1-weiyongjun1@huawei.com Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
2019-09-05erofs: use read_cache_page_gfp for erofs_get_meta_pageGao Xiang1-61/+9
As Christoph said [1], "I'd much prefer to just use read_cache_page_gfp, and live with the fact that this allocates bufferheads behind you for now. I'll try to speed up my attempts to get rid of the buffer heads on the block device mapping instead. " This simplifies the code a lot and a minor thing is "no REQ_META (e.g. for blktrace) on metadata at all..." [1] https://lore.kernel.org/r/20190903153704.GA2201@infradead.org/ Reported-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com> Link: https://lore.kernel.org/r/20190904020912.63925-26-gaoxiang25@huawei.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-09-05erofs: always use iget5_lockedGao Xiang1-7/+0
As Christoph said [1] [2], "Just use the slightly more complicated 32-bit version everywhere so that you have a single actually tested code path. And then remove this helper. " [1] https://lore.kernel.org/r/20190829102426.GE20598@infradead.org/ [2] https://lore.kernel.org/r/20190902125320.GA16726@infradead.org/ Reported-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com> Link: https://lore.kernel.org/r/20190904020912.63925-25-gaoxiang25@huawei.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-09-05erofs: use read_mapping_page instead of sb_breadGao Xiang1-6/+9
As Christoph said [1], "This seems to be your only direct use of buffer heads, which while not deprecated are a bit of an ugly step child. So if you can easily avoid creating a buffer_head dependency in a new filesystem I think you should avoid it. " [1] https://lore.kernel.org/r/20190902125109.GA9826@infradead.org/ Reported-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com> Link: https://lore.kernel.org/r/20190904020912.63925-24-gaoxiang25@huawei.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-09-05erofs: rename errln/infoln/debugln to erofs_{err, info, dbg}Gao Xiang11-90/+139
Add prefix "erofs_" to these functions and print sb->s_id as a prefix to erofs_{err, info} so that the user knows which file system is affected. Reported-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com> Link: https://lore.kernel.org/r/20190904020912.63925-23-gaoxiang25@huawei.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-09-05erofs: save one level of indentationGao Xiang1-32/+33
As Christoph said [1], ".. and save one level of indentation." [1] https://lore.kernel.org/r/20190829102426.GE20598@infradead.org/ Reported-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com> Link: https://lore.kernel.org/r/20190904020912.63925-22-gaoxiang25@huawei.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-09-05erofs: kill use_vmap module parameterGao Xiang1-33/+13
As Christoph said [1], "vm_map_ram is supposed to generally behave better. So if it doesn't please report that that to the arch maintainer and linux-mm so that they can look into the issue. Having user make choices of deep down kernel internals is just a horrible interface. Please talk to maintainers of other bits of the kernel if you see issues and / or need enhancements. " Let's redo the previous conclusion and kill the vmap approach. [1] https://lore.kernel.org/r/20190830165533.GA10909@infradead.org/ Reported-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com> Link: https://lore.kernel.org/r/20190904020912.63925-21-gaoxiang25@huawei.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-09-05erofs: kill all erofs specific fault injectionGao Xiang6-158/+2
As Christoph suggested [1], "Please just use plain kmalloc everywhere and let the normal kernel error injection code take care of injeting any errors." [1] https://lore.kernel.org/r/20190829102426.GE20598@infradead.org/ Reported-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com> Link: https://lore.kernel.org/r/20190904020912.63925-20-gaoxiang25@huawei.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-09-05erofs: add "erofs_" prefix for common and short functionsGao Xiang7-53/+54
Add erofs_ prefix to free_inode, alloc_inode, ... Reported-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com> Link: https://lore.kernel.org/r/20190904020912.63925-19-gaoxiang25@huawei.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-09-05erofs: kill __submit_bio()Gao Xiang3-17/+17
As Christoph pointed out [1], " Why is there __submit_bio which really just obsfucates what is going on? Also why is __submit_bio using bio_set_op_attrs instead of opencode it as the comment right next to it asks you to? " Let's use submit_bio directly instead. [1] https://lore.kernel.org/r/20190830162812.GA10694@infradead.org/ Reported-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com> Link: https://lore.kernel.org/r/20190904020912.63925-18-gaoxiang25@huawei.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-09-05erofs: kill prio and nofail of erofs_get_meta_page()Gao Xiang5-46/+16
As Christoph pointed out [1], "Why is there __erofs_get_meta_page with the two weird booleans instead of a single erofs_get_meta_page that gets and gfp_t for additional flags and an unsigned int for additional bio op flags." And since all callers can handle errors, let's kill prio and nofail and erofs_get_inline_page() now. [1] https://lore.kernel.org/r/20190830162812.GA10694@infradead.org/ Reported-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com> Link: https://lore.kernel.org/r/20190904020912.63925-17-gaoxiang25@huawei.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-09-05erofs: localize erofs_grab_bio()Gao Xiang3-45/+22
As Christoph pointed out [1], "erofs_grab_bio tries to handle a bio_alloc failure, except that the function will not actually fail due the mempool backing it." Sorry about useless code, fix it now and localize erofs_grab_bio [2]. [1] https://lore.kernel.org/r/20190830162812.GA10694@infradead.org/ [2] https://lore.kernel.org/r/20190902122016.GL15931@infradead.org/ Reported-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com> Link: https://lore.kernel.org/r/20190904020912.63925-16-gaoxiang25@huawei.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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