From 80069284b5eb63e48bc7cb9d4bd179711ae6e77a Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Tue, 11 Apr 2023 19:00:31 -0700 Subject: [PATCH] xfs: split usedmap from xchk_xattr_buf.buf Move the used space bitmap from somewhere in xchk_xattr_buf.buf[] to an explicit pointer. Signed-off-by: Darrick J. Wong Reviewed-by: Dave Chinner --- fs/xfs/scrub/attr.c | 39 +++++++++++++++++++++------------------ fs/xfs/scrub/attr.h | 22 +++++----------------- 2 files changed, 26 insertions(+), 35 deletions(-) diff --git a/fs/xfs/scrub/attr.c b/fs/xfs/scrub/attr.c index bc529b5..65ec503 100644 --- a/fs/xfs/scrub/attr.c +++ b/fs/xfs/scrub/attr.c @@ -29,6 +29,8 @@ xchk_xattr_buf_cleanup( kvfree(ab->freemap); ab->freemap = NULL; + kvfree(ab->usedmap); + ab->usedmap = NULL; } /* @@ -42,21 +44,15 @@ xchk_setup_xattr_buf( size_t value_size, gfp_t flags) { - size_t sz; + size_t sz = value_size; size_t bmp_sz; struct xchk_xattr_buf *ab = sc->buf; + unsigned long *old_usedmap = NULL; unsigned long *old_freemap = NULL; bmp_sz = sizeof(long) * BITS_TO_LONGS(sc->mp->m_attr_geo->blksize); /* - * We need enough space to read an xattr value from the file or enough - * space to hold one copy of the xattr free space bitmap. We don't - * need the buffer space for both purposes at the same time. - */ - sz = max_t(size_t, bmp_sz, value_size); - - /* * If there's already a buffer, figure out if we need to reallocate it * to accommodate a larger size. */ @@ -64,6 +60,7 @@ xchk_setup_xattr_buf( if (sz <= ab->sz) return 0; old_freemap = ab->freemap; + old_usedmap = ab->usedmap; kvfree(ab); sc->buf = NULL; } @@ -79,6 +76,14 @@ xchk_setup_xattr_buf( sc->buf = ab; sc->buf_cleanup = xchk_xattr_buf_cleanup; + if (old_usedmap) { + ab->usedmap = old_usedmap; + } else { + ab->usedmap = kvmalloc(bmp_sz, flags); + if (!ab->usedmap) + return -ENOMEM; + } + if (old_freemap) { ab->freemap = old_freemap; } else { @@ -243,7 +248,6 @@ xchk_xattr_set_map( STATIC bool xchk_xattr_check_freemap( struct xfs_scrub *sc, - unsigned long *map, struct xfs_attr3_icleaf_hdr *leafhdr) { struct xchk_xattr_buf *ab = sc->buf; @@ -260,7 +264,7 @@ xchk_xattr_check_freemap( } /* Look for bits that are set in freemap and are marked in use. */ - return !bitmap_intersects(ab->freemap, map, mapsize); + return !bitmap_intersects(ab->freemap, ab->usedmap, mapsize); } /* @@ -280,7 +284,7 @@ xchk_xattr_entry( __u32 *last_hashval) { struct xfs_mount *mp = ds->state->mp; - unsigned long *usedmap = xchk_xattr_usedmap(ds->sc); + struct xchk_xattr_buf *ab = ds->sc->buf; char *name_end; struct xfs_attr_leaf_name_local *lentry; struct xfs_attr_leaf_name_remote *rentry; @@ -320,7 +324,7 @@ xchk_xattr_entry( if (name_end > buf_end) xchk_da_set_corrupt(ds, level); - if (!xchk_xattr_set_map(ds->sc, usedmap, nameidx, namesize)) + if (!xchk_xattr_set_map(ds->sc, ab->usedmap, nameidx, namesize)) xchk_da_set_corrupt(ds, level); if (!(ds->sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)) *usedbytes += namesize; @@ -340,7 +344,7 @@ xchk_xattr_block( struct xfs_attr_leafblock *leaf = bp->b_addr; struct xfs_attr_leaf_entry *ent; struct xfs_attr_leaf_entry *entries; - unsigned long *usedmap; + struct xchk_xattr_buf *ab = ds->sc->buf; char *buf_end; size_t off; __u32 last_hashval = 0; @@ -358,10 +362,9 @@ xchk_xattr_block( return -EDEADLOCK; if (error) return error; - usedmap = xchk_xattr_usedmap(ds->sc); *last_checked = blk->blkno; - bitmap_zero(usedmap, mp->m_attr_geo->blksize); + bitmap_zero(ab->usedmap, mp->m_attr_geo->blksize); /* Check all the padding. */ if (xfs_has_crc(ds->sc->mp)) { @@ -385,7 +388,7 @@ xchk_xattr_block( xchk_da_set_corrupt(ds, level); if (leafhdr.firstused < hdrsize) xchk_da_set_corrupt(ds, level); - if (!xchk_xattr_set_map(ds->sc, usedmap, 0, hdrsize)) + if (!xchk_xattr_set_map(ds->sc, ab->usedmap, 0, hdrsize)) xchk_da_set_corrupt(ds, level); if (ds->sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT) @@ -399,7 +402,7 @@ xchk_xattr_block( for (i = 0, ent = entries; i < leafhdr.count; ent++, i++) { /* Mark the leaf entry itself. */ off = (char *)ent - (char *)leaf; - if (!xchk_xattr_set_map(ds->sc, usedmap, off, + if (!xchk_xattr_set_map(ds->sc, ab->usedmap, off, sizeof(xfs_attr_leaf_entry_t))) { xchk_da_set_corrupt(ds, level); goto out; @@ -413,7 +416,7 @@ xchk_xattr_block( goto out; } - if (!xchk_xattr_check_freemap(ds->sc, usedmap, &leafhdr)) + if (!xchk_xattr_check_freemap(ds->sc, &leafhdr)) xchk_da_set_corrupt(ds, level); if (leafhdr.usedbytes != usedbytes) diff --git a/fs/xfs/scrub/attr.h b/fs/xfs/scrub/attr.h index 341855b..525f458 100644 --- a/fs/xfs/scrub/attr.h +++ b/fs/xfs/scrub/attr.h @@ -10,6 +10,9 @@ * Temporary storage for online scrub and repair of extended attributes. */ struct xchk_xattr_buf { + /* Bitmap of used space in xattr leaf blocks. */ + unsigned long *usedmap; + /* Bitmap of free space in xattr leaf blocks. */ unsigned long *freemap; @@ -17,13 +20,8 @@ struct xchk_xattr_buf { size_t sz; /* - * Memory buffer -- either used for extracting attr values while - * walking the attributes; or for computing attr block bitmaps when - * checking the attribute tree. - * - * Each bitmap contains enough bits to track every byte in an attr - * block (rounded up to the size of an unsigned long). The attr block - * used space bitmap starts at the beginning of the buffer. + * Memory buffer -- used for extracting attr values while walking the + * attributes. */ uint8_t buf[]; }; @@ -38,14 +36,4 @@ xchk_xattr_valuebuf( return ab->buf; } -/* A bitmap of space usage computed by walking an attr leaf block. */ -static inline unsigned long * -xchk_xattr_usedmap( - struct xfs_scrub *sc) -{ - struct xchk_xattr_buf *ab = sc->buf; - - return (unsigned long *)ab->buf; -} - #endif /* __XFS_SCRUB_ATTR_H__ */ -- 2.7.4