| Message ID | 20230201172146.1874205-1-aalbersh@redhat.com (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Headers | show |
| Series | xfs_db: make flist_find_ftyp() to check for field existance on disk | expand |
On Wed, Feb 01, 2023 at 06:21:47PM +0100, Andrey Albershteyn wrote: > flist_find_ftyp() searches for the field of the requested type. The > first found field/path is returned. However, this doesn't work when > there are multiple fields of the same type. For example, attr3 type > have a few CRC fields. Leaf block (xfs_attr_leaf_hdr -> > xfs_da3_blkinfo) and remote value block (xfs_attr3_rmt_hdr) both > have CRC but goes under attr3 type. This causes 'crc' command to be > unable to find CRC field when we are at remote attribute block as it > tries to use leaf block CRC path: > > $ dd if=/dev/zero bs=4k count=10 | tr '\000' '1' > test.img > $ touch test.file > $ setfattr -n user.bigattr -v "$(cat test.img)" test.file > > $ # CRC of the leaf block > $ xfs_db -r -x /dev/sda5 -c 'inode 132' -c 'ablock 0' -c 'crc' > Verifying CRC: > hdr.info.crc = 0x102b5cbf (correct) > > $ # CRC of the remote value block > $ xfs_db -r -x /dev/sda5 -c 'inode 132' -c 'ablock 1' -c 'crc' > field info not found > parsing error > > Solve this by making flist_find_ftyp() to also check that field in > question have non-zero count (exist at the current block). > > Signed-off-by: Andrey Albershteyn <aalbersh@redhat.com> > --- > db/crc.c | 2 +- > db/flist.c | 13 ++++++++++--- > db/flist.h | 3 ++- > 3 files changed, 13 insertions(+), 5 deletions(-) > > diff --git a/db/crc.c b/db/crc.c > index 7428b916..1c73f980 100644 > --- a/db/crc.c > +++ b/db/crc.c > @@ -114,7 +114,7 @@ crc_f( > } > > /* Search for a CRC field */ > - fl = flist_find_ftyp(fields, FLDT_CRC); > + fl = flist_find_ftyp(fields, FLDT_CRC, iocur_top->data, 0); > if (!fl) { > dbprintf(_("No CRC field found for type %s\n"), cur_typ->name); > return 0; > diff --git a/db/flist.c b/db/flist.c > index 0bb6474c..d275abfe 100644 > --- a/db/flist.c > +++ b/db/flist.c > @@ -408,11 +408,14 @@ flist_split( > */ > flist_t * > flist_find_ftyp( > - const field_t *fields, > - fldt_t type) > + const field_t *fields, > + fldt_t type, > + void *obj, > + int startoff) > { > flist_t *fl; > const field_t *f; > + int count; > const ftattr_t *fa; > > for (f = fields; f->name; f++) { > @@ -420,11 +423,15 @@ flist_find_ftyp( > fl->fld = f; > if (f->ftyp == type) > return fl; > + count = fcount(f, obj, startoff); > + if (!count) { > + continue; > + } Minor nit: no need for curly braces here. With that cleaned up, Reviewed-by: Darrick J. Wong <djwong@kernel.org> --D > fa = &ftattrtab[f->ftyp]; > if (fa->subfld) { > flist_t *nfl; > > - nfl = flist_find_ftyp(fa->subfld, type); > + nfl = flist_find_ftyp(fa->subfld, type, obj, startoff); > if (nfl) { > fl->child = nfl; > return fl; > diff --git a/db/flist.h b/db/flist.h > index f0772378..e327a360 100644 > --- a/db/flist.h > +++ b/db/flist.h > @@ -38,4 +38,5 @@ extern int flist_parse(const struct field *fields, flist_t *fl, void *obj, > int startoff); > extern void flist_print(flist_t *fl); > extern flist_t *flist_scan(char *name); > -extern flist_t *flist_find_ftyp(const field_t *fields, fldt_t type); > +extern flist_t *flist_find_ftyp(const field_t *fields, fldt_t type, void *obj, > + int startoff); > -- > 2.31.1 >
diff --git a/db/crc.c b/db/crc.c index 7428b916..1c73f980 100644 --- a/db/crc.c +++ b/db/crc.c @@ -114,7 +114,7 @@ crc_f( } /* Search for a CRC field */ - fl = flist_find_ftyp(fields, FLDT_CRC); + fl = flist_find_ftyp(fields, FLDT_CRC, iocur_top->data, 0); if (!fl) { dbprintf(_("No CRC field found for type %s\n"), cur_typ->name); return 0; diff --git a/db/flist.c b/db/flist.c index 0bb6474c..d275abfe 100644 --- a/db/flist.c +++ b/db/flist.c @@ -408,11 +408,14 @@ flist_split( */ flist_t * flist_find_ftyp( - const field_t *fields, - fldt_t type) + const field_t *fields, + fldt_t type, + void *obj, + int startoff) { flist_t *fl; const field_t *f; + int count; const ftattr_t *fa; for (f = fields; f->name; f++) { @@ -420,11 +423,15 @@ flist_find_ftyp( fl->fld = f; if (f->ftyp == type) return fl; + count = fcount(f, obj, startoff); + if (!count) { + continue; + } fa = &ftattrtab[f->ftyp]; if (fa->subfld) { flist_t *nfl; - nfl = flist_find_ftyp(fa->subfld, type); + nfl = flist_find_ftyp(fa->subfld, type, obj, startoff); if (nfl) { fl->child = nfl; return fl; diff --git a/db/flist.h b/db/flist.h index f0772378..e327a360 100644 --- a/db/flist.h +++ b/db/flist.h @@ -38,4 +38,5 @@ extern int flist_parse(const struct field *fields, flist_t *fl, void *obj, int startoff); extern void flist_print(flist_t *fl); extern flist_t *flist_scan(char *name); -extern flist_t *flist_find_ftyp(const field_t *fields, fldt_t type); +extern flist_t *flist_find_ftyp(const field_t *fields, fldt_t type, void *obj, + int startoff);
flist_find_ftyp() searches for the field of the requested type. The first found field/path is returned. However, this doesn't work when there are multiple fields of the same type. For example, attr3 type have a few CRC fields. Leaf block (xfs_attr_leaf_hdr -> xfs_da3_blkinfo) and remote value block (xfs_attr3_rmt_hdr) both have CRC but goes under attr3 type. This causes 'crc' command to be unable to find CRC field when we are at remote attribute block as it tries to use leaf block CRC path: $ dd if=/dev/zero bs=4k count=10 | tr '\000' '1' > test.img $ touch test.file $ setfattr -n user.bigattr -v "$(cat test.img)" test.file $ # CRC of the leaf block $ xfs_db -r -x /dev/sda5 -c 'inode 132' -c 'ablock 0' -c 'crc' Verifying CRC: hdr.info.crc = 0x102b5cbf (correct) $ # CRC of the remote value block $ xfs_db -r -x /dev/sda5 -c 'inode 132' -c 'ablock 1' -c 'crc' field info not found parsing error Solve this by making flist_find_ftyp() to also check that field in question have non-zero count (exist at the current block). Signed-off-by: Andrey Albershteyn <aalbersh@redhat.com> --- db/crc.c | 2 +- db/flist.c | 13 ++++++++++--- db/flist.h | 3 ++- 3 files changed, 13 insertions(+), 5 deletions(-)