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Fix -Wattribute-warning in zfs_log_xvattr()

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Restructure the code in zfs_log_xvattr() to use a lr_attr_end
structure when accessing lr_attr_t elements located after the
variable sized array.  This makes the code more understandable
and resolves the accessing beyond the end of the field warnings.

Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #13528
Closes #13575
This commit is contained in:
Brian Behlendorf 2022-06-20 22:36:38 +00:00
parent a6e8113fed
commit b0f7dd276c
2 changed files with 39 additions and 35 deletions
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11
include/sys/zil.h
View File

@ -223,6 +223,15 @@ typedef struct {
uint64_t lr_foid; /* object id */
} lr_ooo_t;
/*
* Additional lr_attr_t fields.
*/
typedef struct {
uint64_t lr_attr_attrs; /* all of the attributes */
uint64_t lr_attr_crtime[2]; /* create time */
uint8_t lr_attr_scanstamp[32];
} lr_attr_end_t;
/*
* Handle option extended vattr attributes.
*
@ -233,7 +242,7 @@ typedef struct {
typedef struct {
uint32_t lr_attr_masksize; /* number of elements in array */
uint32_t lr_attr_bitmap; /* First entry of array */
/* remainder of array and any additional fields */
/* remainder of array and additional lr_attr_end_t fields */
} lr_attr_t;
/*

63
module/zfs/zfs_log.c
View File

@ -107,86 +107,81 @@ zfs_log_create_txtype(zil_create_t type, vsecattr_t *vsecp, vattr_t *vap)
static void
zfs_log_xvattr(lr_attr_t *lrattr, xvattr_t *xvap)
{
uint32_t *bitmap;
uint64_t *attrs;
uint64_t *crtime;
xoptattr_t *xoap;
void *scanstamp;
int i;
xoptattr_t *xoap;
xoap = xva_getxoptattr(xvap);
ASSERT(xoap);
lrattr->lr_attr_masksize = xvap->xva_mapsize;
bitmap = &lrattr->lr_attr_bitmap;
for (i = 0; i != xvap->xva_mapsize; i++, bitmap++) {
uint32_t *bitmap = &lrattr->lr_attr_bitmap;
for (int i = 0; i != xvap->xva_mapsize; i++, bitmap++)
*bitmap = xvap->xva_reqattrmap[i];
}
/* Now pack the attributes up in a single uint64_t */
attrs = (uint64_t *)bitmap;
*attrs = 0;
crtime = attrs + 1;
memset(crtime, 0, 2 * sizeof (uint64_t));
scanstamp = (caddr_t)(crtime + 2);
memset(scanstamp, 0, AV_SCANSTAMP_SZ);
lr_attr_end_t *end = (lr_attr_end_t *)bitmap;
end->lr_attr_attrs = 0;
end->lr_attr_crtime[0] = 0;
end->lr_attr_crtime[1] = 0;
memset(end->lr_attr_scanstamp, 0, AV_SCANSTAMP_SZ);
if (XVA_ISSET_REQ(xvap, XAT_READONLY))
*attrs |= (xoap->xoa_readonly == 0) ? 0 :
end->lr_attr_attrs |= (xoap->xoa_readonly == 0) ? 0 :
XAT0_READONLY;
if (XVA_ISSET_REQ(xvap, XAT_HIDDEN))
*attrs |= (xoap->xoa_hidden == 0) ? 0 :
end->lr_attr_attrs |= (xoap->xoa_hidden == 0) ? 0 :
XAT0_HIDDEN;
if (XVA_ISSET_REQ(xvap, XAT_SYSTEM))
*attrs |= (xoap->xoa_system == 0) ? 0 :
end->lr_attr_attrs |= (xoap->xoa_system == 0) ? 0 :
XAT0_SYSTEM;
if (XVA_ISSET_REQ(xvap, XAT_ARCHIVE))
*attrs |= (xoap->xoa_archive == 0) ? 0 :
end->lr_attr_attrs |= (xoap->xoa_archive == 0) ? 0 :
XAT0_ARCHIVE;
if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE))
*attrs |= (xoap->xoa_immutable == 0) ? 0 :
end->lr_attr_attrs |= (xoap->xoa_immutable == 0) ? 0 :
XAT0_IMMUTABLE;
if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK))
*attrs |= (xoap->xoa_nounlink == 0) ? 0 :
end->lr_attr_attrs |= (xoap->xoa_nounlink == 0) ? 0 :
XAT0_NOUNLINK;
if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY))
*attrs |= (xoap->xoa_appendonly == 0) ? 0 :
end->lr_attr_attrs |= (xoap->xoa_appendonly == 0) ? 0 :
XAT0_APPENDONLY;
if (XVA_ISSET_REQ(xvap, XAT_OPAQUE))
*attrs |= (xoap->xoa_opaque == 0) ? 0 :
end->lr_attr_attrs |= (xoap->xoa_opaque == 0) ? 0 :
XAT0_APPENDONLY;
if (XVA_ISSET_REQ(xvap, XAT_NODUMP))
*attrs |= (xoap->xoa_nodump == 0) ? 0 :
end->lr_attr_attrs |= (xoap->xoa_nodump == 0) ? 0 :
XAT0_NODUMP;
if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED))
*attrs |= (xoap->xoa_av_quarantined == 0) ? 0 :
end->lr_attr_attrs |= (xoap->xoa_av_quarantined == 0) ? 0 :
XAT0_AV_QUARANTINED;
if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED))
*attrs |= (xoap->xoa_av_modified == 0) ? 0 :
end->lr_attr_attrs |= (xoap->xoa_av_modified == 0) ? 0 :
XAT0_AV_MODIFIED;
if (XVA_ISSET_REQ(xvap, XAT_CREATETIME))
ZFS_TIME_ENCODE(&xoap->xoa_createtime, crtime);
ZFS_TIME_ENCODE(&xoap->xoa_createtime, end->lr_attr_crtime);
if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP)) {
ASSERT(!XVA_ISSET_REQ(xvap, XAT_PROJID));
memcpy(scanstamp, xoap->xoa_av_scanstamp, AV_SCANSTAMP_SZ);
memcpy(end->lr_attr_scanstamp, xoap->xoa_av_scanstamp,
AV_SCANSTAMP_SZ);
} else if (XVA_ISSET_REQ(xvap, XAT_PROJID)) {
/*
* XAT_PROJID and XAT_AV_SCANSTAMP will never be valid
* at the same time, so we can share the same space.
*/
memcpy(scanstamp, &xoap->xoa_projid, sizeof (uint64_t));
memcpy(end->lr_attr_scanstamp, &xoap->xoa_projid,
sizeof (uint64_t));
}
if (XVA_ISSET_REQ(xvap, XAT_REPARSE))
*attrs |= (xoap->xoa_reparse == 0) ? 0 :
end->lr_attr_attrs |= (xoap->xoa_reparse == 0) ? 0 :
XAT0_REPARSE;
if (XVA_ISSET_REQ(xvap, XAT_OFFLINE))
*attrs |= (xoap->xoa_offline == 0) ? 0 :
end->lr_attr_attrs |= (xoap->xoa_offline == 0) ? 0 :
XAT0_OFFLINE;
if (XVA_ISSET_REQ(xvap, XAT_SPARSE))
*attrs |= (xoap->xoa_sparse == 0) ? 0 :
end->lr_attr_attrs |= (xoap->xoa_sparse == 0) ? 0 :
XAT0_SPARSE;
if (XVA_ISSET_REQ(xvap, XAT_PROJINHERIT))
*attrs |= (xoap->xoa_projinherit == 0) ? 0 :
end->lr_attr_attrs |= (xoap->xoa_projinherit == 0) ? 0 :
XAT0_PROJINHERIT;
}