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772430dd67
Various disk controllers require their buffers to be aligned to a
cache-line size (128 bytes). For buffers allocated in structures,
ensure that they are 128-byte aligned. Use aligned_malloc to allocate
memory to ensure that the returned memory is 128-byte aligned.
While we are here, we replace the dynamically allocated inode buffer
with a buffer allocated in the uufsd structure just as the superblock
and cylinder group buffers do.
This can be removed if/when the kernel is fixed. Because this problem
has existed on one I/O subsystem or another since the 1990's, we
are probably stuck with dealing with it forever.
The problem most recent showed up in Azure, see:
https://reviews.freebsd.org/D41728
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=267654
Before these fixes were applied, it was confirmed that the changes
in this commit also fixed the issue in Azure.
Reviewed-by: Warner Losh, kib
Tested-by: Souradeep Chakrabarti of Microsoft (earlier version)
PR: 267654
Differential Revision: https://reviews.freebsd.org/D41724
193 lines
5.8 KiB
C
193 lines
5.8 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2002 Juli Mallett. All rights reserved.
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*
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* This software was written by Juli Mallett <jmallett@FreeBSD.org> for the
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* FreeBSD project. Redistribution and use in source and binary forms, with
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* or without modification, are permitted provided that the following
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* conditions are met:
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*
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* 1. Redistribution of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistribution in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __LIBUFS_H__
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#define __LIBUFS_H__
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/*
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* Various disk controllers require their buffers to be aligned to the size
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* of a cache line. The LIBUFS_BUFALIGN defines the required alignment size.
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* The alignment must be a power of 2.
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*/
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#define LIBUFS_BUFALIGN 128
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/*
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* libufs structures.
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*/
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union dinodep {
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struct ufs1_dinode *dp1;
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struct ufs2_dinode *dp2;
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};
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/*
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* userland ufs disk.
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*/
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struct uufsd {
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union {
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struct fs d_fs; /* filesystem information */
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char d_sb[SBLOCKSIZE]; /* superblock as buffer */
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} d_sbunion __aligned(LIBUFS_BUFALIGN);
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union {
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struct cg d_cg; /* cylinder group */
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char d_buf[MAXBSIZE]; /* cylinder group storage */
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} d_cgunion __aligned(LIBUFS_BUFALIGN);
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union {
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union dinodep d_ino[1]; /* inode block */
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char d_inos[MAXBSIZE]; /* inode block as buffer */
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} d_inosunion __aligned(LIBUFS_BUFALIGN);
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const char *d_name; /* disk name */
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const char *d_error; /* human readable disk error */
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ufs2_daddr_t d_sblock; /* superblock location */
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struct fs_summary_info *d_si; /* Superblock summary info */
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union dinodep d_dp; /* pointer to currently active inode */
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ino_t d_inomin; /* low ino */
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ino_t d_inomax; /* high ino */
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off_t d_sblockloc; /* where to look for the superblock */
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int64_t d_bsize; /* device bsize */
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int64_t d_lookupflags; /* flags to superblock lookup */
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int64_t d_mine; /* internal flags */
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int32_t d_ccg; /* current cylinder group */
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int32_t d_ufs; /* decimal UFS version */
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int32_t d_fd; /* raw device file descriptor */
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int32_t d_lcg; /* last cylinder group (in d_cg) */
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};
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#define d_inos d_inosunion.d_inos
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#define d_fs d_sbunion.d_fs
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#define d_cg d_cgunion.d_cg
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/*
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* libufs macros (internal, non-exported).
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*/
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#ifdef _LIBUFS
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/*
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* Ensure that the buffer is aligned to the I/O subsystem requirements.
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*/
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#define BUF_MALLOC(newbufpp, data, size) { \
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if (data != NULL && (((intptr_t)data) & (LIBUFS_BUFALIGN - 1)) == 0) \
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*newbufpp = (void *)data; \
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else \
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*newbufpp = aligned_alloc(LIBUFS_BUFALIGN, size); \
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}
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/*
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* Trace steps through libufs, to be used at entry and erroneous return.
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*/
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static inline void
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ERROR(struct uufsd *u, const char *str)
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{
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#ifdef _LIBUFS_DEBUGGING
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if (str != NULL) {
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fprintf(stderr, "libufs: %s", str);
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if (errno != 0)
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fprintf(stderr, ": %s", strerror(errno));
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fprintf(stderr, "\n");
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}
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#endif
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if (u != NULL)
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u->d_error = str;
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}
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#endif /* _LIBUFS */
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__BEGIN_DECLS
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/*
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* libufs prototypes.
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*/
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/*
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* ffs_subr.c
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*/
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void ffs_clrblock(struct fs *, u_char *, ufs1_daddr_t);
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void ffs_clusteracct(struct fs *, struct cg *, ufs1_daddr_t, int);
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void ffs_fragacct(struct fs *, int, int32_t [], int);
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int ffs_isblock(struct fs *, u_char *, ufs1_daddr_t);
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int ffs_isfreeblock(struct fs *, u_char *, ufs1_daddr_t);
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int ffs_sbsearch(void *, struct fs **, int, char *,
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int (*)(void *, off_t, void **, int));
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void ffs_setblock(struct fs *, u_char *, ufs1_daddr_t);
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int ffs_sbget(void *, struct fs **, off_t, int, char *,
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int (*)(void *, off_t, void **, int));
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int ffs_sbput(void *, struct fs *, off_t,
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int (*)(void *, off_t, void *, int));
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void ffs_update_dinode_ckhash(struct fs *, struct ufs2_dinode *);
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int ffs_verify_dinode_ckhash(struct fs *, struct ufs2_dinode *);
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/*
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* block.c
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*/
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ssize_t bread(struct uufsd *, ufs2_daddr_t, void *, size_t);
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ssize_t bwrite(struct uufsd *, ufs2_daddr_t, const void *, size_t);
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int berase(struct uufsd *, ufs2_daddr_t, ufs2_daddr_t);
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/*
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* cgroup.c
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*/
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ufs2_daddr_t cgballoc(struct uufsd *);
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int cgbfree(struct uufsd *, ufs2_daddr_t, long);
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ino_t cgialloc(struct uufsd *);
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int cgget(int, struct fs *, int, struct cg *);
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int cgput(int, struct fs *, struct cg *);
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int cgread(struct uufsd *);
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int cgread1(struct uufsd *, int);
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int cgwrite(struct uufsd *);
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int cgwrite1(struct uufsd *, int);
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/*
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* inode.c
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*/
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int getinode(struct uufsd *, union dinodep *, ino_t);
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int putinode(struct uufsd *);
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/*
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* sblock.c
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*/
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int sbread(struct uufsd *);
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int sbfind(struct uufsd *, int);
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int sbwrite(struct uufsd *, int);
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/* low level superblock read/write functions */
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int sbget(int, struct fs **, off_t, int);
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int sbsearch(int, struct fs **, int);
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int sbput(int, struct fs *, int);
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/*
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* type.c
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*/
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int ufs_disk_close(struct uufsd *);
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int ufs_disk_fillout(struct uufsd *, const char *);
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int ufs_disk_fillout_blank(struct uufsd *, const char *);
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int ufs_disk_write(struct uufsd *);
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/*
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* crc32c.c
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*/
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uint32_t calculate_crc32c(uint32_t, const void *, size_t);
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__END_DECLS
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#endif /* __LIBUFS_H__ */
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