* misc cleanups
@ 2017-04-19 19:29 Christoph Hellwig
2017-04-19 19:29 ` [PATCH 1/3] xfs: remove the unused XFS_MAXLINK_1 define Christoph Hellwig
` (2 more replies)
0 siblings, 3 replies; 11+ messages in thread
From: Christoph Hellwig @ 2017-04-19 19:29 UTC (permalink / raw)
To: linux-xfs
Remove some unused #defines / enums and simplify the validation of
the unwritten extent bit.
^ permalink raw reply [flat|nested] 11+ messages in thread* [PATCH 1/3] xfs: remove the unused XFS_MAXLINK_1 define 2017-04-19 19:29 misc cleanups Christoph Hellwig @ 2017-04-19 19:29 ` Christoph Hellwig 2017-04-19 19:57 ` Darrick J. Wong 2017-04-19 19:58 ` Eric Sandeen 2017-04-19 19:29 ` [PATCH 2/3] xfs: remove unused values from xfs_exntst_t Christoph Hellwig 2017-04-19 19:29 ` [PATCH 3/3] xfs: simplify validation of the unwritten extent bit Christoph Hellwig 2 siblings, 2 replies; 11+ messages in thread From: Christoph Hellwig @ 2017-04-19 19:29 UTC (permalink / raw) To: linux-xfs Signed-off-by: Christoph Hellwig <hch@lst.de> --- fs/xfs/libxfs/xfs_format.h | 2 -- 1 file changed, 2 deletions(-) diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h index 6b7579e7b60a..d114ed80a076 100644 --- a/fs/xfs/libxfs/xfs_format.h +++ b/fs/xfs/libxfs/xfs_format.h @@ -930,10 +930,8 @@ static inline uint xfs_dinode_size(int version) /* * The 32 bit link count in the inode theoretically maxes out at UINT_MAX. * Since the pathconf interface is signed, we use 2^31 - 1 instead. - * The old inode format had a 16 bit link count, so its maximum is USHRT_MAX. */ #define XFS_MAXLINK ((1U << 31) - 1U) -#define XFS_MAXLINK_1 65535U /* * Values for di_format -- 2.11.0 ^ permalink raw reply related [flat|nested] 11+ messages in thread
* Re: [PATCH 1/3] xfs: remove the unused XFS_MAXLINK_1 define 2017-04-19 19:29 ` [PATCH 1/3] xfs: remove the unused XFS_MAXLINK_1 define Christoph Hellwig @ 2017-04-19 19:57 ` Darrick J. Wong 2017-04-19 19:58 ` Eric Sandeen 1 sibling, 0 replies; 11+ messages in thread From: Darrick J. Wong @ 2017-04-19 19:57 UTC (permalink / raw) To: Christoph Hellwig; +Cc: linux-xfs On Wed, Apr 19, 2017 at 09:29:02PM +0200, Christoph Hellwig wrote: > Signed-off-by: Christoph Hellwig <hch@lst.de> > --- > fs/xfs/libxfs/xfs_format.h | 2 -- > 1 file changed, 2 deletions(-) > > diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h > index 6b7579e7b60a..d114ed80a076 100644 > --- a/fs/xfs/libxfs/xfs_format.h > +++ b/fs/xfs/libxfs/xfs_format.h > @@ -930,10 +930,8 @@ static inline uint xfs_dinode_size(int version) > /* > * The 32 bit link count in the inode theoretically maxes out at UINT_MAX. > * Since the pathconf interface is signed, we use 2^31 - 1 instead. > - * The old inode format had a 16 bit link count, so its maximum is USHRT_MAX. > */ > #define XFS_MAXLINK ((1U << 31) - 1U) > -#define XFS_MAXLINK_1 65535U Looks ok, Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> --D > > /* > * Values for di_format > -- > 2.11.0 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-xfs" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH 1/3] xfs: remove the unused XFS_MAXLINK_1 define 2017-04-19 19:29 ` [PATCH 1/3] xfs: remove the unused XFS_MAXLINK_1 define Christoph Hellwig 2017-04-19 19:57 ` Darrick J. Wong @ 2017-04-19 19:58 ` Eric Sandeen 1 sibling, 0 replies; 11+ messages in thread From: Eric Sandeen @ 2017-04-19 19:58 UTC (permalink / raw) To: Christoph Hellwig, linux-xfs On 4/19/17 2:29 PM, Christoph Hellwig wrote: > Signed-off-by: Christoph Hellwig <hch@lst.de> Tricky! ;) Reviewed-by: Eric Sandeen <sandeen@redhat.com> > --- > fs/xfs/libxfs/xfs_format.h | 2 -- > 1 file changed, 2 deletions(-) > > diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h > index 6b7579e7b60a..d114ed80a076 100644 > --- a/fs/xfs/libxfs/xfs_format.h > +++ b/fs/xfs/libxfs/xfs_format.h > @@ -930,10 +930,8 @@ static inline uint xfs_dinode_size(int version) > /* > * The 32 bit link count in the inode theoretically maxes out at UINT_MAX. > * Since the pathconf interface is signed, we use 2^31 - 1 instead. > - * The old inode format had a 16 bit link count, so its maximum is USHRT_MAX. > */ > #define XFS_MAXLINK ((1U << 31) - 1U) > -#define XFS_MAXLINK_1 65535U > > /* > * Values for di_format > ^ permalink raw reply [flat|nested] 11+ messages in thread
* [PATCH 2/3] xfs: remove unused values from xfs_exntst_t 2017-04-19 19:29 misc cleanups Christoph Hellwig 2017-04-19 19:29 ` [PATCH 1/3] xfs: remove the unused XFS_MAXLINK_1 define Christoph Hellwig @ 2017-04-19 19:29 ` Christoph Hellwig 2017-04-19 19:59 ` Darrick J. Wong 2017-04-19 19:59 ` Eric Sandeen 2017-04-19 19:29 ` [PATCH 3/3] xfs: simplify validation of the unwritten extent bit Christoph Hellwig 2 siblings, 2 replies; 11+ messages in thread From: Christoph Hellwig @ 2017-04-19 19:29 UTC (permalink / raw) To: linux-xfs We only ever use the normal and unwritten states. And the actual ondisk format (this enum isn't despite being in xfs_format.h) only has space for the unwritten bit anyway. Signed-off-by: Christoph Hellwig <hch@lst.de> --- fs/xfs/libxfs/xfs_format.h | 1 - 1 file changed, 1 deletion(-) diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h index d114ed80a076..8425884668a8 100644 --- a/fs/xfs/libxfs/xfs_format.h +++ b/fs/xfs/libxfs/xfs_format.h @@ -1588,7 +1588,6 @@ typedef enum { */ typedef enum { XFS_EXT_NORM, XFS_EXT_UNWRITTEN, - XFS_EXT_DMAPI_OFFLINE, XFS_EXT_INVALID } xfs_exntst_t; /* -- 2.11.0 ^ permalink raw reply related [flat|nested] 11+ messages in thread
* Re: [PATCH 2/3] xfs: remove unused values from xfs_exntst_t 2017-04-19 19:29 ` [PATCH 2/3] xfs: remove unused values from xfs_exntst_t Christoph Hellwig @ 2017-04-19 19:59 ` Darrick J. Wong 2017-04-19 19:59 ` Eric Sandeen 1 sibling, 0 replies; 11+ messages in thread From: Darrick J. Wong @ 2017-04-19 19:59 UTC (permalink / raw) To: Christoph Hellwig; +Cc: linux-xfs On Wed, Apr 19, 2017 at 09:29:03PM +0200, Christoph Hellwig wrote: > We only ever use the normal and unwritten states. And the actual > ondisk format (this enum isn't despite being in xfs_format.h) only > has space for the unwritten bit anyway. > > Signed-off-by: Christoph Hellwig <hch@lst.de> Looks ok, Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> --D > --- > fs/xfs/libxfs/xfs_format.h | 1 - > 1 file changed, 1 deletion(-) > > diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h > index d114ed80a076..8425884668a8 100644 > --- a/fs/xfs/libxfs/xfs_format.h > +++ b/fs/xfs/libxfs/xfs_format.h > @@ -1588,7 +1588,6 @@ typedef enum { > */ > typedef enum { > XFS_EXT_NORM, XFS_EXT_UNWRITTEN, > - XFS_EXT_DMAPI_OFFLINE, XFS_EXT_INVALID > } xfs_exntst_t; > > /* > -- > 2.11.0 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-xfs" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH 2/3] xfs: remove unused values from xfs_exntst_t 2017-04-19 19:29 ` [PATCH 2/3] xfs: remove unused values from xfs_exntst_t Christoph Hellwig 2017-04-19 19:59 ` Darrick J. Wong @ 2017-04-19 19:59 ` Eric Sandeen 1 sibling, 0 replies; 11+ messages in thread From: Eric Sandeen @ 2017-04-19 19:59 UTC (permalink / raw) To: Christoph Hellwig, linux-xfs On 4/19/17 2:29 PM, Christoph Hellwig wrote: > We only ever use the normal and unwritten states. And the actual > ondisk format (this enum isn't despite being in xfs_format.h) only > has space for the unwritten bit anyway. > > Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Eric Sandeen <sandeen@redhat.com> > --- > fs/xfs/libxfs/xfs_format.h | 1 - > 1 file changed, 1 deletion(-) > > diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h > index d114ed80a076..8425884668a8 100644 > --- a/fs/xfs/libxfs/xfs_format.h > +++ b/fs/xfs/libxfs/xfs_format.h > @@ -1588,7 +1588,6 @@ typedef enum { > */ > typedef enum { > XFS_EXT_NORM, XFS_EXT_UNWRITTEN, > - XFS_EXT_DMAPI_OFFLINE, XFS_EXT_INVALID > } xfs_exntst_t; > > /* > ^ permalink raw reply [flat|nested] 11+ messages in thread
* [PATCH 3/3] xfs: simplify validation of the unwritten extent bit 2017-04-19 19:29 misc cleanups Christoph Hellwig 2017-04-19 19:29 ` [PATCH 1/3] xfs: remove the unused XFS_MAXLINK_1 define Christoph Hellwig 2017-04-19 19:29 ` [PATCH 2/3] xfs: remove unused values from xfs_exntst_t Christoph Hellwig @ 2017-04-19 19:29 ` Christoph Hellwig 2017-04-19 20:17 ` Darrick J. Wong 2 siblings, 1 reply; 11+ messages in thread From: Christoph Hellwig @ 2017-04-19 19:29 UTC (permalink / raw) To: linux-xfs XFS only supports the unwritten extent bit in the data fork, and only if the file system has a version 5 superblock or the unwritten extent feature bit. We currently have two routines that validate the invariant: xfs_check_nostate_extents which return -EFSCORRUPTED when it's not met, and xfs_validate_extent that triggers and assert in debug build. Both of them iterate over all extents of an inode fork when called, which isn't very efficient. This patch instead adds a new helper that verifies the invariant one extent at a time, and calls it from the places where we iterate over all extents to converted them from or two the in-memory format. The callers then return -EFSCORRUPTED when reading invalid extents from disk, or trigger an assert when writing them to disk. Signed-off-by: Christoph Hellwig <hch@lst.de> --- fs/xfs/libxfs/xfs_bmap.c | 16 +------- fs/xfs/libxfs/xfs_bmap.h | 2 - fs/xfs/libxfs/xfs_bmap_btree.c | 26 ------------ fs/xfs/libxfs/xfs_bmap_btree.h | 21 ++++++---- fs/xfs/libxfs/xfs_format.h | 8 ---- fs/xfs/libxfs/xfs_inode_fork.c | 90 ++++++++++++------------------------------ 6 files changed, 41 insertions(+), 122 deletions(-) diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c index 9bd104f32908..ad5ae571f74f 100644 --- a/fs/xfs/libxfs/xfs_bmap.c +++ b/fs/xfs/libxfs/xfs_bmap.c @@ -1260,7 +1260,6 @@ xfs_bmap_read_extents( xfs_fsblock_t bno; /* block # of "block" */ xfs_buf_t *bp; /* buffer for "block" */ int error; /* error return value */ - xfs_exntfmt_t exntf; /* XFS_EXTFMT_NOSTATE, if checking */ xfs_extnum_t i, j; /* index into the extents list */ xfs_ifork_t *ifp; /* fork structure */ int level; /* btree level, for checking */ @@ -1271,8 +1270,6 @@ xfs_bmap_read_extents( mp = ip->i_mount; ifp = XFS_IFORK_PTR(ip, whichfork); - exntf = (whichfork != XFS_DATA_FORK) ? XFS_EXTFMT_NOSTATE : - XFS_EXTFMT_INODE(ip); block = ifp->if_broot; /* * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out. @@ -1340,18 +1337,9 @@ xfs_bmap_read_extents( xfs_bmbt_rec_host_t *trp = xfs_iext_get_ext(ifp, i); trp->l0 = be64_to_cpu(frp->l0); trp->l1 = be64_to_cpu(frp->l1); - } - if (exntf == XFS_EXTFMT_NOSTATE) { - /* - * Check all attribute bmap btree records and - * any "older" data bmap btree records for a - * set bit in the "extent flag" position. - */ - if (unlikely(xfs_check_nostate_extents(ifp, - start, num_recs))) { + if (!xfs_bmbt_validate_extent(mp, whichfork, trp)) { XFS_ERROR_REPORT("xfs_bmap_read_extents(2)", - XFS_ERRLEVEL_LOW, - ip->i_mount); + XFS_ERRLEVEL_LOW, mp); goto error0; } } diff --git a/fs/xfs/libxfs/xfs_bmap.h b/fs/xfs/libxfs/xfs_bmap.h index a6e612cabe15..c35a14fa1527 100644 --- a/fs/xfs/libxfs/xfs_bmap.h +++ b/fs/xfs/libxfs/xfs_bmap.h @@ -244,8 +244,6 @@ int xfs_bmap_del_extent_delay(struct xfs_inode *ip, int whichfork, struct xfs_bmbt_irec *del); void xfs_bmap_del_extent_cow(struct xfs_inode *ip, xfs_extnum_t *idx, struct xfs_bmbt_irec *got, struct xfs_bmbt_irec *del); -int xfs_check_nostate_extents(struct xfs_ifork *ifp, xfs_extnum_t idx, - xfs_extnum_t num); uint xfs_default_attroffset(struct xfs_inode *ip); int xfs_bmap_shift_extents(struct xfs_trans *tp, struct xfs_inode *ip, xfs_fileoff_t *next_fsb, xfs_fileoff_t offset_shift_fsb, diff --git a/fs/xfs/libxfs/xfs_bmap_btree.c b/fs/xfs/libxfs/xfs_bmap_btree.c index fd55db479385..a5d34a37f314 100644 --- a/fs/xfs/libxfs/xfs_bmap_btree.c +++ b/fs/xfs/libxfs/xfs_bmap_btree.c @@ -366,32 +366,6 @@ xfs_bmbt_to_bmdr( memcpy(tpp, fpp, sizeof(*fpp) * dmxr); } -/* - * Check extent records, which have just been read, for - * any bit in the extent flag field. ASSERT on debug - * kernels, as this condition should not occur. - * Return an error condition (1) if any flags found, - * otherwise return 0. - */ - -int -xfs_check_nostate_extents( - xfs_ifork_t *ifp, - xfs_extnum_t idx, - xfs_extnum_t num) -{ - for (; num > 0; num--, idx++) { - xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, idx); - if ((ep->l0 >> - (64 - BMBT_EXNTFLAG_BITLEN)) != 0) { - ASSERT(0); - return 1; - } - } - return 0; -} - - STATIC struct xfs_btree_cur * xfs_bmbt_dup_cursor( struct xfs_btree_cur *cur) diff --git a/fs/xfs/libxfs/xfs_bmap_btree.h b/fs/xfs/libxfs/xfs_bmap_btree.h index 90347a99c6d2..9da5a8d4f184 100644 --- a/fs/xfs/libxfs/xfs_bmap_btree.h +++ b/fs/xfs/libxfs/xfs_bmap_btree.h @@ -25,13 +25,6 @@ struct xfs_inode; struct xfs_trans; /* - * Extent state and extent format macros. - */ -#define XFS_EXTFMT_INODE(x) \ - (xfs_sb_version_hasextflgbit(&((x)->i_mount->m_sb)) ? \ - XFS_EXTFMT_HASSTATE : XFS_EXTFMT_NOSTATE) - -/* * Btree block header size depends on a superblock flag. */ #define XFS_BMBT_BLOCK_LEN(mp) \ @@ -139,4 +132,18 @@ extern int xfs_bmbt_change_owner(struct xfs_trans *tp, struct xfs_inode *ip, extern struct xfs_btree_cur *xfs_bmbt_init_cursor(struct xfs_mount *, struct xfs_trans *, struct xfs_inode *, int); +/* + * Check that the extent does not contain an invalid unwritten extent flag. + */ +static inline bool xfs_bmbt_validate_extent(struct xfs_mount *mp, int whichfork, + struct xfs_bmbt_rec_host *ep) +{ + if (ep->l0 >> (64 - BMBT_EXNTFLAG_BITLEN) == 0) + return true; + if (whichfork == XFS_DATA_FORK && + xfs_sb_version_hasextflgbit(&mp->m_sb)) + return true; + return false; +} + #endif /* __XFS_BMAP_BTREE_H__ */ diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h index 8425884668a8..a1dccd8d96bc 100644 --- a/fs/xfs/libxfs/xfs_format.h +++ b/fs/xfs/libxfs/xfs_format.h @@ -1576,14 +1576,6 @@ static inline xfs_filblks_t startblockval(xfs_fsblock_t x) } /* - * Possible extent formats. - */ -typedef enum { - XFS_EXTFMT_NOSTATE = 0, - XFS_EXTFMT_HASSTATE -} xfs_exntfmt_t; - -/* * Possible extent states. */ typedef enum { diff --git a/fs/xfs/libxfs/xfs_inode_fork.c b/fs/xfs/libxfs/xfs_inode_fork.c index 8a37efe04de3..0e80f34fe97c 100644 --- a/fs/xfs/libxfs/xfs_inode_fork.c +++ b/fs/xfs/libxfs/xfs_inode_fork.c @@ -42,35 +42,6 @@ STATIC int xfs_iformat_local(xfs_inode_t *, xfs_dinode_t *, int, int); STATIC int xfs_iformat_extents(xfs_inode_t *, xfs_dinode_t *, int); STATIC int xfs_iformat_btree(xfs_inode_t *, xfs_dinode_t *, int); -#ifdef DEBUG -/* - * Make sure that the extents in the given memory buffer - * are valid. - */ -void -xfs_validate_extents( - xfs_ifork_t *ifp, - int nrecs, - xfs_exntfmt_t fmt) -{ - xfs_bmbt_irec_t irec; - xfs_bmbt_rec_host_t rec; - int i; - - for (i = 0; i < nrecs; i++) { - xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, i); - rec.l0 = get_unaligned(&ep->l0); - rec.l1 = get_unaligned(&ep->l1); - xfs_bmbt_get_all(&rec, &irec); - if (fmt == XFS_EXTFMT_NOSTATE) - ASSERT(irec.br_state == XFS_EXT_NORM); - } -} -#else /* DEBUG */ -#define xfs_validate_extents(ifp, nrecs, fmt) -#endif /* DEBUG */ - - /* * Move inode type and inode format specific information from the * on-disk inode to the in-core inode. For fifos, devs, and sockets @@ -352,40 +323,33 @@ xfs_iformat_local( } /* - * The file consists of a set of extents all - * of which fit into the on-disk inode. - * If there are few enough extents to fit into - * the if_inline_ext, then copy them there. - * Otherwise allocate a buffer for them and copy - * them into it. Either way, set if_extents - * to point at the extents. + * The file consists of a set of extents all of which fit into the on-disk + * inode. If there are few enough extents to fit into the if_inline_ext, then + * copy them there. Otherwise allocate a buffer for them and copy them into it. + * Either way, set if_extents to point at the extents. */ STATIC int xfs_iformat_extents( - xfs_inode_t *ip, - xfs_dinode_t *dip, - int whichfork) + struct xfs_inode *ip, + struct xfs_dinode *dip, + int whichfork) { - xfs_bmbt_rec_t *dp; - xfs_ifork_t *ifp; - int nex; - int size; - int i; - - ifp = XFS_IFORK_PTR(ip, whichfork); - nex = XFS_DFORK_NEXTENTS(dip, whichfork); - size = nex * (uint)sizeof(xfs_bmbt_rec_t); + struct xfs_mount *mp = ip->i_mount; + struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork); + int nex = XFS_DFORK_NEXTENTS(dip, whichfork); + int size = nex * sizeof(xfs_bmbt_rec_t); + struct xfs_bmbt_rec *dp; + int i; /* - * If the number of extents is unreasonable, then something - * is wrong and we just bail out rather than crash in - * kmem_alloc() or memcpy() below. + * If the number of extents is unreasonable, then something is wrong and + * we just bail out rather than crash in kmem_alloc() or memcpy() below. */ - if (unlikely(size < 0 || size > XFS_DFORK_SIZE(dip, ip->i_mount, whichfork))) { + if (unlikely(size < 0 || size > XFS_DFORK_SIZE(dip, mp, whichfork))) { xfs_warn(ip->i_mount, "corrupt inode %Lu ((a)extents = %d).", (unsigned long long) ip->i_ino, nex); XFS_CORRUPTION_ERROR("xfs_iformat_extents(1)", XFS_ERRLEVEL_LOW, - ip->i_mount, dip); + mp, dip); return -EFSCORRUPTED; } @@ -400,22 +364,17 @@ xfs_iformat_extents( ifp->if_bytes = size; if (size) { dp = (xfs_bmbt_rec_t *) XFS_DFORK_PTR(dip, whichfork); - xfs_validate_extents(ifp, nex, XFS_EXTFMT_INODE(ip)); for (i = 0; i < nex; i++, dp++) { xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, i); ep->l0 = get_unaligned_be64(&dp->l0); ep->l1 = get_unaligned_be64(&dp->l1); + if (!xfs_bmbt_validate_extent(mp, whichfork, ep)) { + XFS_ERROR_REPORT("xfs_iformat_extents(2)", + XFS_ERRLEVEL_LOW, mp); + return -EFSCORRUPTED; + } } XFS_BMAP_TRACE_EXLIST(ip, nex, whichfork); - if (whichfork != XFS_DATA_FORK || - XFS_EXTFMT_INODE(ip) == XFS_EXTFMT_NOSTATE) - if (unlikely(xfs_check_nostate_extents( - ifp, 0, nex))) { - XFS_ERROR_REPORT("xfs_iformat_extents(2)", - XFS_ERRLEVEL_LOW, - ip->i_mount); - return -EFSCORRUPTED; - } } ifp->if_flags |= XFS_IFEXTENTS; return 0; @@ -518,7 +477,6 @@ xfs_iread_extents( xfs_iext_destroy(ifp); return error; } - xfs_validate_extents(ifp, nextents, XFS_EXTFMT_INODE(ip)); ifp->if_flags |= XFS_IFEXTENTS; return 0; } @@ -837,6 +795,9 @@ xfs_iextents_copy( copied = 0; for (i = 0; i < nrecs; i++) { xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, i); + + ASSERT(xfs_bmbt_validate_extent(ip->i_mount, whichfork, ep)); + start_block = xfs_bmbt_get_startblock(ep); if (isnullstartblock(start_block)) { /* @@ -852,7 +813,6 @@ xfs_iextents_copy( copied++; } ASSERT(copied != 0); - xfs_validate_extents(ifp, copied, XFS_EXTFMT_INODE(ip)); return (copied * (uint)sizeof(xfs_bmbt_rec_t)); } -- 2.11.0 ^ permalink raw reply related [flat|nested] 11+ messages in thread
* Re: [PATCH 3/3] xfs: simplify validation of the unwritten extent bit 2017-04-19 19:29 ` [PATCH 3/3] xfs: simplify validation of the unwritten extent bit Christoph Hellwig @ 2017-04-19 20:17 ` Darrick J. Wong 2017-04-20 14:38 ` Christoph Hellwig 0 siblings, 1 reply; 11+ messages in thread From: Darrick J. Wong @ 2017-04-19 20:17 UTC (permalink / raw) To: Christoph Hellwig; +Cc: linux-xfs On Wed, Apr 19, 2017 at 09:29:04PM +0200, Christoph Hellwig wrote: > XFS only supports the unwritten extent bit in the data fork, and only if > the file system has a version 5 superblock or the unwritten extent > feature bit. > > We currently have two routines that validate the invariant: > xfs_check_nostate_extents which return -EFSCORRUPTED when it's not met, > and xfs_validate_extent that triggers and assert in debug build. > > Both of them iterate over all extents of an inode fork when called, > which isn't very efficient. > > This patch instead adds a new helper that verifies the invariant one > extent at a time, and calls it from the places where we iterate over > all extents to converted them from or two the in-memory format. The > callers then return -EFSCORRUPTED when reading invalid extents from > disk, or trigger an assert when writing them to disk. > > Signed-off-by: Christoph Hellwig <hch@lst.de> > --- > fs/xfs/libxfs/xfs_bmap.c | 16 +------- > fs/xfs/libxfs/xfs_bmap.h | 2 - > fs/xfs/libxfs/xfs_bmap_btree.c | 26 ------------ > fs/xfs/libxfs/xfs_bmap_btree.h | 21 ++++++---- > fs/xfs/libxfs/xfs_format.h | 8 ---- > fs/xfs/libxfs/xfs_inode_fork.c | 90 ++++++++++++------------------------------ > 6 files changed, 41 insertions(+), 122 deletions(-) > > diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c > index 9bd104f32908..ad5ae571f74f 100644 > --- a/fs/xfs/libxfs/xfs_bmap.c > +++ b/fs/xfs/libxfs/xfs_bmap.c > @@ -1260,7 +1260,6 @@ xfs_bmap_read_extents( > xfs_fsblock_t bno; /* block # of "block" */ > xfs_buf_t *bp; /* buffer for "block" */ > int error; /* error return value */ > - xfs_exntfmt_t exntf; /* XFS_EXTFMT_NOSTATE, if checking */ > xfs_extnum_t i, j; /* index into the extents list */ > xfs_ifork_t *ifp; /* fork structure */ > int level; /* btree level, for checking */ > @@ -1271,8 +1270,6 @@ xfs_bmap_read_extents( > > mp = ip->i_mount; > ifp = XFS_IFORK_PTR(ip, whichfork); > - exntf = (whichfork != XFS_DATA_FORK) ? XFS_EXTFMT_NOSTATE : > - XFS_EXTFMT_INODE(ip); > block = ifp->if_broot; > /* > * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out. > @@ -1340,18 +1337,9 @@ xfs_bmap_read_extents( > xfs_bmbt_rec_host_t *trp = xfs_iext_get_ext(ifp, i); > trp->l0 = be64_to_cpu(frp->l0); > trp->l1 = be64_to_cpu(frp->l1); > - } > - if (exntf == XFS_EXTFMT_NOSTATE) { > - /* > - * Check all attribute bmap btree records and > - * any "older" data bmap btree records for a > - * set bit in the "extent flag" position. > - */ > - if (unlikely(xfs_check_nostate_extents(ifp, > - start, num_recs))) { > + if (!xfs_bmbt_validate_extent(mp, whichfork, trp)) { > XFS_ERROR_REPORT("xfs_bmap_read_extents(2)", > - XFS_ERRLEVEL_LOW, > - ip->i_mount); > + XFS_ERRLEVEL_LOW, mp); > goto error0; > } > } > diff --git a/fs/xfs/libxfs/xfs_bmap.h b/fs/xfs/libxfs/xfs_bmap.h > index a6e612cabe15..c35a14fa1527 100644 > --- a/fs/xfs/libxfs/xfs_bmap.h > +++ b/fs/xfs/libxfs/xfs_bmap.h > @@ -244,8 +244,6 @@ int xfs_bmap_del_extent_delay(struct xfs_inode *ip, int whichfork, > struct xfs_bmbt_irec *del); > void xfs_bmap_del_extent_cow(struct xfs_inode *ip, xfs_extnum_t *idx, > struct xfs_bmbt_irec *got, struct xfs_bmbt_irec *del); > -int xfs_check_nostate_extents(struct xfs_ifork *ifp, xfs_extnum_t idx, > - xfs_extnum_t num); > uint xfs_default_attroffset(struct xfs_inode *ip); > int xfs_bmap_shift_extents(struct xfs_trans *tp, struct xfs_inode *ip, > xfs_fileoff_t *next_fsb, xfs_fileoff_t offset_shift_fsb, > diff --git a/fs/xfs/libxfs/xfs_bmap_btree.c b/fs/xfs/libxfs/xfs_bmap_btree.c > index fd55db479385..a5d34a37f314 100644 > --- a/fs/xfs/libxfs/xfs_bmap_btree.c > +++ b/fs/xfs/libxfs/xfs_bmap_btree.c > @@ -366,32 +366,6 @@ xfs_bmbt_to_bmdr( > memcpy(tpp, fpp, sizeof(*fpp) * dmxr); > } > > -/* > - * Check extent records, which have just been read, for > - * any bit in the extent flag field. ASSERT on debug > - * kernels, as this condition should not occur. > - * Return an error condition (1) if any flags found, > - * otherwise return 0. > - */ > - > -int > -xfs_check_nostate_extents( > - xfs_ifork_t *ifp, > - xfs_extnum_t idx, > - xfs_extnum_t num) > -{ > - for (; num > 0; num--, idx++) { > - xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, idx); > - if ((ep->l0 >> > - (64 - BMBT_EXNTFLAG_BITLEN)) != 0) { > - ASSERT(0); > - return 1; > - } > - } > - return 0; > -} > - > - > STATIC struct xfs_btree_cur * > xfs_bmbt_dup_cursor( > struct xfs_btree_cur *cur) > diff --git a/fs/xfs/libxfs/xfs_bmap_btree.h b/fs/xfs/libxfs/xfs_bmap_btree.h > index 90347a99c6d2..9da5a8d4f184 100644 > --- a/fs/xfs/libxfs/xfs_bmap_btree.h > +++ b/fs/xfs/libxfs/xfs_bmap_btree.h > @@ -25,13 +25,6 @@ struct xfs_inode; > struct xfs_trans; > > /* > - * Extent state and extent format macros. > - */ > -#define XFS_EXTFMT_INODE(x) \ > - (xfs_sb_version_hasextflgbit(&((x)->i_mount->m_sb)) ? \ > - XFS_EXTFMT_HASSTATE : XFS_EXTFMT_NOSTATE) > - > -/* > * Btree block header size depends on a superblock flag. > */ > #define XFS_BMBT_BLOCK_LEN(mp) \ > @@ -139,4 +132,18 @@ extern int xfs_bmbt_change_owner(struct xfs_trans *tp, struct xfs_inode *ip, > extern struct xfs_btree_cur *xfs_bmbt_init_cursor(struct xfs_mount *, > struct xfs_trans *, struct xfs_inode *, int); > > +/* > + * Check that the extent does not contain an invalid unwritten extent flag. > + */ > +static inline bool xfs_bmbt_validate_extent(struct xfs_mount *mp, int whichfork, > + struct xfs_bmbt_rec_host *ep) Would be nice to have this function formatted the same way as most of the rest of the xfs functions, even if it is static inline... > +{ > + if (ep->l0 >> (64 - BMBT_EXNTFLAG_BITLEN) == 0) > + return true; > + if (whichfork == XFS_DATA_FORK && > + xfs_sb_version_hasextflgbit(&mp->m_sb)) > + return true; > + return false; > +} > + > #endif /* __XFS_BMAP_BTREE_H__ */ > diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h > index 8425884668a8..a1dccd8d96bc 100644 > --- a/fs/xfs/libxfs/xfs_format.h > +++ b/fs/xfs/libxfs/xfs_format.h > @@ -1576,14 +1576,6 @@ static inline xfs_filblks_t startblockval(xfs_fsblock_t x) > } > > /* > - * Possible extent formats. > - */ > -typedef enum { > - XFS_EXTFMT_NOSTATE = 0, > - XFS_EXTFMT_HASSTATE > -} xfs_exntfmt_t; > - > -/* > * Possible extent states. > */ > typedef enum { > diff --git a/fs/xfs/libxfs/xfs_inode_fork.c b/fs/xfs/libxfs/xfs_inode_fork.c > index 8a37efe04de3..0e80f34fe97c 100644 > --- a/fs/xfs/libxfs/xfs_inode_fork.c > +++ b/fs/xfs/libxfs/xfs_inode_fork.c > @@ -42,35 +42,6 @@ STATIC int xfs_iformat_local(xfs_inode_t *, xfs_dinode_t *, int, int); > STATIC int xfs_iformat_extents(xfs_inode_t *, xfs_dinode_t *, int); > STATIC int xfs_iformat_btree(xfs_inode_t *, xfs_dinode_t *, int); > > -#ifdef DEBUG > -/* > - * Make sure that the extents in the given memory buffer > - * are valid. > - */ > -void > -xfs_validate_extents( > - xfs_ifork_t *ifp, > - int nrecs, > - xfs_exntfmt_t fmt) > -{ > - xfs_bmbt_irec_t irec; > - xfs_bmbt_rec_host_t rec; > - int i; > - > - for (i = 0; i < nrecs; i++) { > - xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, i); > - rec.l0 = get_unaligned(&ep->l0); > - rec.l1 = get_unaligned(&ep->l1); > - xfs_bmbt_get_all(&rec, &irec); > - if (fmt == XFS_EXTFMT_NOSTATE) > - ASSERT(irec.br_state == XFS_EXT_NORM); > - } > -} > -#else /* DEBUG */ > -#define xfs_validate_extents(ifp, nrecs, fmt) > -#endif /* DEBUG */ > - > - > /* > * Move inode type and inode format specific information from the > * on-disk inode to the in-core inode. For fifos, devs, and sockets > @@ -352,40 +323,33 @@ xfs_iformat_local( > } > > /* > - * The file consists of a set of extents all > - * of which fit into the on-disk inode. > - * If there are few enough extents to fit into > - * the if_inline_ext, then copy them there. > - * Otherwise allocate a buffer for them and copy > - * them into it. Either way, set if_extents > - * to point at the extents. > + * The file consists of a set of extents all of which fit into the on-disk > + * inode. If there are few enough extents to fit into the if_inline_ext, then > + * copy them there. Otherwise allocate a buffer for them and copy them into it. > + * Either way, set if_extents to point at the extents. > */ > STATIC int > xfs_iformat_extents( > - xfs_inode_t *ip, > - xfs_dinode_t *dip, > - int whichfork) > + struct xfs_inode *ip, > + struct xfs_dinode *dip, > + int whichfork) > { > - xfs_bmbt_rec_t *dp; > - xfs_ifork_t *ifp; > - int nex; > - int size; > - int i; > - > - ifp = XFS_IFORK_PTR(ip, whichfork); > - nex = XFS_DFORK_NEXTENTS(dip, whichfork); > - size = nex * (uint)sizeof(xfs_bmbt_rec_t); > + struct xfs_mount *mp = ip->i_mount; > + struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork); > + int nex = XFS_DFORK_NEXTENTS(dip, whichfork); > + int size = nex * sizeof(xfs_bmbt_rec_t); > + struct xfs_bmbt_rec *dp; > + int i; > > /* > - * If the number of extents is unreasonable, then something > - * is wrong and we just bail out rather than crash in > - * kmem_alloc() or memcpy() below. > + * If the number of extents is unreasonable, then something is wrong and > + * we just bail out rather than crash in kmem_alloc() or memcpy() below. > */ > - if (unlikely(size < 0 || size > XFS_DFORK_SIZE(dip, ip->i_mount, whichfork))) { > + if (unlikely(size < 0 || size > XFS_DFORK_SIZE(dip, mp, whichfork))) { > xfs_warn(ip->i_mount, "corrupt inode %Lu ((a)extents = %d).", > (unsigned long long) ip->i_ino, nex); > XFS_CORRUPTION_ERROR("xfs_iformat_extents(1)", XFS_ERRLEVEL_LOW, > - ip->i_mount, dip); > + mp, dip); > return -EFSCORRUPTED; > } > > @@ -400,22 +364,17 @@ xfs_iformat_extents( > ifp->if_bytes = size; > if (size) { > dp = (xfs_bmbt_rec_t *) XFS_DFORK_PTR(dip, whichfork); > - xfs_validate_extents(ifp, nex, XFS_EXTFMT_INODE(ip)); > for (i = 0; i < nex; i++, dp++) { > xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, i); > ep->l0 = get_unaligned_be64(&dp->l0); > ep->l1 = get_unaligned_be64(&dp->l1); > + if (!xfs_bmbt_validate_extent(mp, whichfork, ep)) { > + XFS_ERROR_REPORT("xfs_iformat_extents(2)", > + XFS_ERRLEVEL_LOW, mp); > + return -EFSCORRUPTED; > + } > } > XFS_BMAP_TRACE_EXLIST(ip, nex, whichfork); > - if (whichfork != XFS_DATA_FORK || > - XFS_EXTFMT_INODE(ip) == XFS_EXTFMT_NOSTATE) > - if (unlikely(xfs_check_nostate_extents( > - ifp, 0, nex))) { > - XFS_ERROR_REPORT("xfs_iformat_extents(2)", > - XFS_ERRLEVEL_LOW, > - ip->i_mount); > - return -EFSCORRUPTED; > - } > } > ifp->if_flags |= XFS_IFEXTENTS; > return 0; > @@ -518,7 +477,6 @@ xfs_iread_extents( > xfs_iext_destroy(ifp); > return error; > } > - xfs_validate_extents(ifp, nextents, XFS_EXTFMT_INODE(ip)); > ifp->if_flags |= XFS_IFEXTENTS; > return 0; > } > @@ -837,6 +795,9 @@ xfs_iextents_copy( > copied = 0; > for (i = 0; i < nrecs; i++) { > xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, i); > + > + ASSERT(xfs_bmbt_validate_extent(ip->i_mount, whichfork, ep)); Wouldn't this be better off in xfs_iflush_int (like the inline dir verifier) since we could prevent bad metadata from hitting the disk? Rather than this, which doesn't do anything on non-debug kernels. OTOH I guess we don't do any verification of the records getting written to the bmbt leaves either... --D > + > start_block = xfs_bmbt_get_startblock(ep); > if (isnullstartblock(start_block)) { > /* > @@ -852,7 +813,6 @@ xfs_iextents_copy( > copied++; > } > ASSERT(copied != 0); > - xfs_validate_extents(ifp, copied, XFS_EXTFMT_INODE(ip)); > > return (copied * (uint)sizeof(xfs_bmbt_rec_t)); > } > -- > 2.11.0 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-xfs" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH 3/3] xfs: simplify validation of the unwritten extent bit 2017-04-19 20:17 ` Darrick J. Wong @ 2017-04-20 14:38 ` Christoph Hellwig 2017-04-20 16:56 ` Darrick J. Wong 0 siblings, 1 reply; 11+ messages in thread From: Christoph Hellwig @ 2017-04-20 14:38 UTC (permalink / raw) To: Darrick J. Wong; +Cc: Christoph Hellwig, linux-xfs [can you trim the quote? Makes reading it and properly quoting it so much easier..] > > +static inline bool xfs_bmbt_validate_extent(struct xfs_mount *mp, int whichfork, > > + struct xfs_bmbt_rec_host *ep) > > Would be nice to have this function formatted the same way as most of > the rest of the xfs functions, even if it is static inline... It's actually the usual style for our inlines. But if you prefer it differently I can do that. > Wouldn't this be better off in xfs_iflush_int (like the inline dir > verifier) since we could prevent bad metadata from hitting the disk? > Rather than this, which doesn't do anything on non-debug kernels. xfs_iflush_int actually calls xfs_iflush_fork which calls xfs_iextents_copy, so it's in the right spot already. Converting it from an assert to an error would have to go through these layers that don't currently expect errors. Note that we also call xfs_iextents_copy from xfs_inode_item_format_data_fork / xfs_inode_item_format_attr_fork, which are called earlier than xfs_iflush_int, where error propagation is even worse. ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH 3/3] xfs: simplify validation of the unwritten extent bit 2017-04-20 14:38 ` Christoph Hellwig @ 2017-04-20 16:56 ` Darrick J. Wong 0 siblings, 0 replies; 11+ messages in thread From: Darrick J. Wong @ 2017-04-20 16:56 UTC (permalink / raw) To: Christoph Hellwig; +Cc: linux-xfs On Thu, Apr 20, 2017 at 04:38:57PM +0200, Christoph Hellwig wrote: > [can you trim the quote? Makes reading it and properly quoting it > so much easier..] > > > > +static inline bool xfs_bmbt_validate_extent(struct xfs_mount *mp, int whichfork, > > > + struct xfs_bmbt_rec_host *ep) > > > > Would be nice to have this function formatted the same way as most of > > the rest of the xfs functions, even if it is static inline... > > It's actually the usual style for our inlines. But if you prefer it > differently I can do that. Nah, don't worry about it. Though I do wonder why static inlines get different treatment; it's rather nice to be able to search for ^xfs_function and find its definition. > > Wouldn't this be better off in xfs_iflush_int (like the inline dir > > verifier) since we could prevent bad metadata from hitting the disk? > > Rather than this, which doesn't do anything on non-debug kernels. > > xfs_iflush_int actually calls xfs_iflush_fork which calls > xfs_iextents_copy, so it's in the right spot already. Converting it > from an assert to an error would have to go through these layers > that don't currently expect errors. Note that we also call > xfs_iextents_copy from xfs_inode_item_format_data_fork / > xfs_inode_item_format_attr_fork, which are called earlier than > xfs_iflush_int, where error propagation is even worse. Fair enough. The rest looks ok, so I'll go run it through testing. --D ^ permalink raw reply [flat|nested] 11+ messages in thread
end of thread, other threads:[~2017-04-20 16:56 UTC | newest] Thread overview: 11+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2017-04-19 19:29 misc cleanups Christoph Hellwig 2017-04-19 19:29 ` [PATCH 1/3] xfs: remove the unused XFS_MAXLINK_1 define Christoph Hellwig 2017-04-19 19:57 ` Darrick J. Wong 2017-04-19 19:58 ` Eric Sandeen 2017-04-19 19:29 ` [PATCH 2/3] xfs: remove unused values from xfs_exntst_t Christoph Hellwig 2017-04-19 19:59 ` Darrick J. Wong 2017-04-19 19:59 ` Eric Sandeen 2017-04-19 19:29 ` [PATCH 3/3] xfs: simplify validation of the unwritten extent bit Christoph Hellwig 2017-04-19 20:17 ` Darrick J. Wong 2017-04-20 14:38 ` Christoph Hellwig 2017-04-20 16:56 ` Darrick J. Wong
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