From: Dave Chinner Date: Fri, 7 Jun 2013 00:25:36 +0000 (+1000) Subject: xfs: shortform directory offsets change for dir3 format X-Git-Tag: v3.2.0-alpha1~119 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=584f90b0841e4024c17321754000525621f5c1d1;p=thirdparty%2Fxfsprogs-dev.git xfs: shortform directory offsets change for dir3 format Because the header size for the CRC enabled directory blocks is larger, the offset of the first entry into a directory block is different to the dir2 format. The shortform directory stores the dirent's offset so that it doesn't change when moving from shortform to block form and back again, and hence it needs to take into account the different header sizes to maintain the correct offsets. Signed-off-by: Dave Chinner Reviewed-by: Ben Myers Signed-off-by: Ben Myers --- diff --git a/db/check.c b/db/check.c index b7855c0fa..27107a07b 100644 --- a/db/check.c +++ b/db/check.c @@ -3418,7 +3418,7 @@ process_sf_dir_v2( dbprintf(_("dir %lld entry . %lld\n"), id->ino, id->ino); (*dot)++; sfe = xfs_dir2_sf_firstentry(&sf->hdr); - offset = XFS_DIR2_DATA_FIRST_OFFSET; + offset = XFS_DIR3_DATA_FIRST_OFFSET(mp); for (i = sf->hdr.count - 1, i8 = 0; i >= 0; i--) { if ((__psint_t)sfe + xfs_dir2_sf_entsize(&sf->hdr,sfe->namelen) - (__psint_t)sf > be64_to_cpu(dip->di_size)) { diff --git a/include/xfs_dir2_format.h b/include/xfs_dir2_format.h index ce3626bb7..6dc884abe 100644 --- a/include/xfs_dir2_format.h +++ b/include/xfs_dir2_format.h @@ -221,16 +221,6 @@ xfs_dir2_sf_nextentry(struct xfs_dir2_sf_hdr *hdr, #define XFS_DIR2_DATA_FIRSTDB(mp) \ xfs_dir2_byte_to_db(mp, XFS_DIR2_DATA_OFFSET) -/* - * Offsets of . and .. in data space (always block 0) - */ -#define XFS_DIR2_DATA_DOT_OFFSET \ - ((xfs_dir2_data_aoff_t)sizeof(struct xfs_dir2_data_hdr)) -#define XFS_DIR2_DATA_DOTDOT_OFFSET \ - (XFS_DIR2_DATA_DOT_OFFSET + xfs_dir2_data_entsize(1)) -#define XFS_DIR2_DATA_FIRST_OFFSET \ - (XFS_DIR2_DATA_DOTDOT_OFFSET + xfs_dir2_data_entsize(2)) - /* * Describe a free area in the data block. * @@ -372,7 +362,20 @@ xfs_dir3_data_unused_p(struct xfs_dir2_data_hdr *hdr) /* * Offsets of . and .. in data space (always block 0) - */ + * + * The macros are used for shortform directories as they have no headers to read + * the magic number out of. Shortform directories need to know the size of the + * data block header because the sfe embeds the block offset of the entry into + * it so that it doesn't change when format conversion occurs. Bad Things Happen + * if we don't follow this rule. + */ +#define XFS_DIR3_DATA_DOT_OFFSET(mp) \ + xfs_dir3_data_hdr_size(xfs_sb_version_hascrc(&(mp)->m_sb)) +#define XFS_DIR3_DATA_DOTDOT_OFFSET(mp) \ + (XFS_DIR3_DATA_DOT_OFFSET(mp) + xfs_dir2_data_entsize(1)) +#define XFS_DIR3_DATA_FIRST_OFFSET(mp) \ + (XFS_DIR3_DATA_DOTDOT_OFFSET(mp) + xfs_dir2_data_entsize(2)) + static inline xfs_dir2_data_aoff_t xfs_dir3_data_dot_offset(struct xfs_dir2_data_hdr *hdr) { diff --git a/libxfs/xfs_dir2_sf.c b/libxfs/xfs_dir2_sf.c index 6848d059d..cb2336862 100644 --- a/libxfs/xfs_dir2_sf.c +++ b/libxfs/xfs_dir2_sf.c @@ -519,7 +519,7 @@ xfs_dir2_sf_addname_hard( * to insert the new entry. * If it's going to end up at the end then oldsfep will point there. */ - for (offset = XFS_DIR2_DATA_FIRST_OFFSET, + for (offset = XFS_DIR3_DATA_FIRST_OFFSET(dp->i_mount), oldsfep = xfs_dir2_sf_firstentry(oldsfp), add_datasize = xfs_dir2_data_entsize(args->namelen), eof = (char *)oldsfep == &buf[old_isize]; @@ -601,7 +601,7 @@ xfs_dir2_sf_addname_pick( sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data; size = xfs_dir2_data_entsize(args->namelen); - offset = XFS_DIR2_DATA_FIRST_OFFSET; + offset = XFS_DIR3_DATA_FIRST_OFFSET(mp); sfep = xfs_dir2_sf_firstentry(sfp); holefit = 0; /* @@ -672,7 +672,7 @@ xfs_dir2_sf_check( dp = args->dp; sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data; - offset = XFS_DIR2_DATA_FIRST_OFFSET; + offset = XFS_DIR3_DATA_FIRST_OFFSET(dp->i_mount); ino = xfs_dir2_sf_get_parent_ino(sfp); i8count = ino > XFS_DIR2_MAX_SHORT_INUM; diff --git a/repair/dir2.c b/repair/dir2.c index 9f1d50bea..2f13864ad 100644 --- a/repair/dir2.c +++ b/repair/dir2.c @@ -682,6 +682,7 @@ process_sf_dir2_fixi8( */ static void process_sf_dir2_fixoff( + xfs_mount_t *mp, xfs_dinode_t *dip) { int i; @@ -691,7 +692,7 @@ process_sf_dir2_fixoff( sfp = (xfs_dir2_sf_t *)XFS_DFORK_DPTR(dip); sfep = xfs_dir2_sf_firstentry(&sfp->hdr); - offset = XFS_DIR2_DATA_FIRST_OFFSET; + offset = XFS_DIR3_DATA_FIRST_OFFSET(mp); for (i = 0; i < sfp->hdr.count; i++) { xfs_dir2_sf_put_offset(sfep, offset); @@ -745,7 +746,7 @@ process_sf_dir2( max_size = XFS_DFORK_DSIZE(dip, mp); num_entries = sfp->hdr.count; ino_dir_size = be64_to_cpu(dip->di_size); - offset = XFS_DIR2_DATA_FIRST_OFFSET; + offset = XFS_DIR3_DATA_FIRST_OFFSET(mp); bad_offset = *repair = 0; ASSERT(ino_dir_size <= max_size); @@ -1102,7 +1103,7 @@ _("would have corrected entry offsets in directory %" PRIu64 "\n"), do_warn( _("corrected entry offsets in directory %" PRIu64 "\n"), ino); - process_sf_dir2_fixoff(dip); + process_sf_dir2_fixoff(mp, dip); *dino_dirty = 1; *repair = 1; }