From 0173ca0544b682b7b313269dc0600d4774098a14 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Fri, 8 Jul 2016 18:41:28 +0900 Subject: nfs/blocklayout: use proper fmode for opening block devices This was fixed for the original block layout code a while ago, but also needs to be fixed for the SCSI layout path. Signed-off-by: Christoph Hellwig Signed-off-by: Trond Myklebust --- fs/nfs/blocklayout/dev.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'fs/nfs/blocklayout') diff --git a/fs/nfs/blocklayout/dev.c b/fs/nfs/blocklayout/dev.c index e5b8967..7fb9c07 100644 --- a/fs/nfs/blocklayout/dev.c +++ b/fs/nfs/blocklayout/dev.c @@ -316,7 +316,7 @@ bl_parse_scsi(struct nfs_server *server, struct pnfs_block_dev *d, return -EINVAL; } - d->bdev = blkdev_get_by_path(devname, FMODE_READ, NULL); + d->bdev = blkdev_get_by_path(devname, FMODE_READ | FMODE_WRITE, NULL); if (IS_ERR(d->bdev)) { pr_warn("pNFS: failed to open device %s (%ld)\n", devname, PTR_ERR(d->bdev)); @@ -352,7 +352,7 @@ bl_parse_scsi(struct nfs_server *server, struct pnfs_block_dev *d, return 0; out_blkdev_put: - blkdev_put(d->bdev, FMODE_READ); + blkdev_put(d->bdev, FMODE_READ | FMODE_WRITE); return error; } -- cgit v1.1 From d702d41ed41328487bd3b270467721222f8036e4 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Fri, 8 Jul 2016 18:41:29 +0900 Subject: nfs/blocklayout: refactor open-by-wwn The current code works with the standard udev/systemd names, but we'll have to add another method in the next patch. Refactor it into a separate helper to make room for the new variant. Signed-off-by: Christoph Hellwig Signed-off-by: Trond Myklebust --- fs/nfs/blocklayout/dev.c | 53 ++++++++++++++++++++++++------------------------ 1 file changed, 27 insertions(+), 26 deletions(-) (limited to 'fs/nfs/blocklayout') diff --git a/fs/nfs/blocklayout/dev.c b/fs/nfs/blocklayout/dev.c index 7fb9c07..ea70883 100644 --- a/fs/nfs/blocklayout/dev.c +++ b/fs/nfs/blocklayout/dev.c @@ -287,44 +287,45 @@ bl_validate_designator(struct pnfs_block_volume *v) } } +/* + * Try to open the udev path for the WWN. At least on Debian the udev + * by-id path will always point to the dm-multipath device if one exists. + */ +static struct block_device * +bl_open_udev_path(struct pnfs_block_volume *v) +{ + struct block_device *bdev; + const char *devname; + + devname = kasprintf(GFP_KERNEL, "/dev/disk/by-id/wwn-0x%*phN", + v->scsi.designator_len, v->scsi.designator); + if (!devname) + return ERR_PTR(-ENOMEM); + + bdev = blkdev_get_by_path(devname, FMODE_READ | FMODE_WRITE, NULL); + if (IS_ERR(bdev)) { + pr_warn("pNFS: failed to open device %s (%ld)\n", + devname, PTR_ERR(bdev)); + } + + kfree(devname); + return bdev; +} + static int bl_parse_scsi(struct nfs_server *server, struct pnfs_block_dev *d, struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask) { struct pnfs_block_volume *v = &volumes[idx]; const struct pr_ops *ops; - const char *devname; int error; if (!bl_validate_designator(v)) return -EINVAL; - switch (v->scsi.designator_len) { - case 8: - devname = kasprintf(GFP_KERNEL, "/dev/disk/by-id/wwn-0x%8phN", - v->scsi.designator); - break; - case 12: - devname = kasprintf(GFP_KERNEL, "/dev/disk/by-id/wwn-0x%12phN", - v->scsi.designator); - break; - case 16: - devname = kasprintf(GFP_KERNEL, "/dev/disk/by-id/wwn-0x%16phN", - v->scsi.designator); - break; - default: - return -EINVAL; - } - - d->bdev = blkdev_get_by_path(devname, FMODE_READ | FMODE_WRITE, NULL); - if (IS_ERR(d->bdev)) { - pr_warn("pNFS: failed to open device %s (%ld)\n", - devname, PTR_ERR(d->bdev)); - kfree(devname); + d->bdev = bl_open_udev_path(v); + if (IS_ERR(d->bdev)) return PTR_ERR(d->bdev); - } - - kfree(devname); d->len = i_size_read(d->bdev->bd_inode); d->map = bl_map_simple; -- cgit v1.1 From 11487ddbdb12c36e094bedcc5c906ff219905a03 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Fri, 8 Jul 2016 18:41:30 +0900 Subject: nfs/blocklayout: support RH/Fedora dm-mpath device nodes Instead of reusing the wwn-* names for multipath devices nodes RHEL and Fedora introduce new dm-mpath-uuid-* nodes with a slightly different naming scheme. Try these names first to ensure we always get a multipath-capable device if it exists. Signed-off-by: Christoph Hellwig Signed-off-by: Trond Myklebust --- fs/nfs/blocklayout/dev.c | 26 +++++++++++++++++++++++++- 1 file changed, 25 insertions(+), 1 deletion(-) (limited to 'fs/nfs/blocklayout') diff --git a/fs/nfs/blocklayout/dev.c b/fs/nfs/blocklayout/dev.c index ea70883..436bb30 100644 --- a/fs/nfs/blocklayout/dev.c +++ b/fs/nfs/blocklayout/dev.c @@ -312,6 +312,28 @@ bl_open_udev_path(struct pnfs_block_volume *v) return bdev; } +/* + * Try to open the RH/Fedora specific dm-mpath udev path for this WWN, as the + * wwn- links will only point to the first discovered SCSI device there. + */ +static struct block_device * +bl_open_dm_mpath_udev_path(struct pnfs_block_volume *v) +{ + struct block_device *bdev; + const char *devname; + + devname = kasprintf(GFP_KERNEL, + "/dev/disk/by-id/dm-uuid-mpath-%d%*phN", + v->scsi.designator_type, + v->scsi.designator_len, v->scsi.designator); + if (!devname) + return ERR_PTR(-ENOMEM); + + bdev = blkdev_get_by_path(devname, FMODE_READ | FMODE_WRITE, NULL); + kfree(devname); + return bdev; +} + static int bl_parse_scsi(struct nfs_server *server, struct pnfs_block_dev *d, struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask) @@ -323,7 +345,9 @@ bl_parse_scsi(struct nfs_server *server, struct pnfs_block_dev *d, if (!bl_validate_designator(v)) return -EINVAL; - d->bdev = bl_open_udev_path(v); + d->bdev = bl_open_dm_mpath_udev_path(v); + if (IS_ERR(d->bdev)) + d->bdev = bl_open_udev_path(v); if (IS_ERR(d->bdev)) return PTR_ERR(d->bdev); -- cgit v1.1 From ecc2b88c4a48cbabb3ed7617f55e92c123fb634b Mon Sep 17 00:00:00 2001 From: Kinglong Mee Date: Thu, 14 Jul 2016 12:01:28 +0800 Subject: nfs/blocklayout: Make sure calculate signature length aligned Avoid a bad nfs server return an unaligned length of signature. Signed-off-by: Kinglong Mee Signed-off-by: Trond Myklebust --- fs/nfs/blocklayout/dev.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'fs/nfs/blocklayout') diff --git a/fs/nfs/blocklayout/dev.c b/fs/nfs/blocklayout/dev.c index 436bb30..7d9f570 100644 --- a/fs/nfs/blocklayout/dev.c +++ b/fs/nfs/blocklayout/dev.c @@ -89,7 +89,8 @@ nfs4_block_decode_volume(struct xdr_stream *xdr, struct pnfs_block_volume *b) memcpy(&b->simple.sigs[i].sig, p, b->simple.sigs[i].sig_len); - b->simple.len += 8 + 4 + b->simple.sigs[i].sig_len; + b->simple.len += 8 + 4 + \ + (XDR_QUADLEN(b->simple.sigs[i].sig_len) << 2); } break; case PNFS_BLOCK_VOLUME_SLICE: -- cgit v1.1 From c77efc1e7884c818ba67ec36b08e220202d9428c Mon Sep 17 00:00:00 2001 From: Kinglong Mee Date: Thu, 14 Jul 2016 12:02:01 +0800 Subject: nfs/blocklayout: Check max uuids and devices before decoding Avoid nfs return uuids/devices larger than maximum. Signed-off-by: Kinglong Mee Signed-off-by: Trond Myklebust --- fs/nfs/blocklayout/dev.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) (limited to 'fs/nfs/blocklayout') diff --git a/fs/nfs/blocklayout/dev.c b/fs/nfs/blocklayout/dev.c index 7d9f570..118252f 100644 --- a/fs/nfs/blocklayout/dev.c +++ b/fs/nfs/blocklayout/dev.c @@ -65,8 +65,8 @@ nfs4_block_decode_volume(struct xdr_stream *xdr, struct pnfs_block_volume *b) if (!p) return -EIO; b->simple.nr_sigs = be32_to_cpup(p++); - if (!b->simple.nr_sigs) { - dprintk("no signature\n"); + if (!b->simple.nr_sigs || b->simple.nr_sigs > PNFS_BLOCK_MAX_UUIDS) { + dprintk("Bad signature count: %d\n", b->simple.nr_sigs); return -EIO; } @@ -105,7 +105,12 @@ nfs4_block_decode_volume(struct xdr_stream *xdr, struct pnfs_block_volume *b) p = xdr_inline_decode(xdr, 4); if (!p) return -EIO; + b->concat.volumes_count = be32_to_cpup(p++); + if (b->concat.volumes_count > PNFS_BLOCK_MAX_DEVICES) { + dprintk("Too many volumes: %d\n", b->concat.volumes_count); + return -EIO; + } p = xdr_inline_decode(xdr, b->concat.volumes_count * 4); if (!p) @@ -117,8 +122,13 @@ nfs4_block_decode_volume(struct xdr_stream *xdr, struct pnfs_block_volume *b) p = xdr_inline_decode(xdr, 8 + 4); if (!p) return -EIO; + p = xdr_decode_hyper(p, &b->stripe.chunk_size); b->stripe.volumes_count = be32_to_cpup(p++); + if (b->stripe.volumes_count > PNFS_BLOCK_MAX_DEVICES) { + dprintk("Too many volumes: %d\n", b->stripe.volumes_count); + return -EIO; + } p = xdr_inline_decode(xdr, b->stripe.volumes_count * 4); if (!p) -- cgit v1.1 From 297fae4d0bee5d683533f3324baf1b363e7b48bf Mon Sep 17 00:00:00 2001 From: Artem Savkov Date: Thu, 21 Jul 2016 13:32:04 +0200 Subject: Fix NULL pointer dereference in bl_free_device(). When bl_parse_deviceid() fails in bl_alloc_deviceid_node() on blkdev_get_by_*() step we get an pnfs_block_dev struct that is uninitialized except for bdev field which is set to whatever error blkdev_get_by_*() returns. bl_free_device() then tries to call blkdev_put() if bdev is not 0 resulting in a wrong pointer dereference. Fixing this by setting bdev in struct pnfs_block_dev only if we didn't get an error from blkdev_get_by_*(). Signed-off-by: Artem Savkov Reviewed-by: Benjamin Coddington Signed-off-by: Trond Myklebust --- fs/nfs/blocklayout/dev.c | 22 +++++++++++++--------- 1 file changed, 13 insertions(+), 9 deletions(-) (limited to 'fs/nfs/blocklayout') diff --git a/fs/nfs/blocklayout/dev.c b/fs/nfs/blocklayout/dev.c index 118252f..a69ef4e 100644 --- a/fs/nfs/blocklayout/dev.c +++ b/fs/nfs/blocklayout/dev.c @@ -235,18 +235,20 @@ bl_parse_simple(struct nfs_server *server, struct pnfs_block_dev *d, struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask) { struct pnfs_block_volume *v = &volumes[idx]; + struct block_device *bdev; dev_t dev; dev = bl_resolve_deviceid(server, v, gfp_mask); if (!dev) return -EIO; - d->bdev = blkdev_get_by_dev(dev, FMODE_READ | FMODE_WRITE, NULL); - if (IS_ERR(d->bdev)) { + bdev = blkdev_get_by_dev(dev, FMODE_READ | FMODE_WRITE, NULL); + if (IS_ERR(bdev)) { printk(KERN_WARNING "pNFS: failed to open device %d:%d (%ld)\n", - MAJOR(dev), MINOR(dev), PTR_ERR(d->bdev)); - return PTR_ERR(d->bdev); + MAJOR(dev), MINOR(dev), PTR_ERR(bdev)); + return PTR_ERR(bdev); } + d->bdev = bdev; d->len = i_size_read(d->bdev->bd_inode); @@ -350,17 +352,19 @@ bl_parse_scsi(struct nfs_server *server, struct pnfs_block_dev *d, struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask) { struct pnfs_block_volume *v = &volumes[idx]; + struct block_device *bdev; const struct pr_ops *ops; int error; if (!bl_validate_designator(v)) return -EINVAL; - d->bdev = bl_open_dm_mpath_udev_path(v); - if (IS_ERR(d->bdev)) - d->bdev = bl_open_udev_path(v); - if (IS_ERR(d->bdev)) - return PTR_ERR(d->bdev); + bdev = bl_open_dm_mpath_udev_path(v); + if (IS_ERR(bdev)) + bdev = bl_open_udev_path(v); + if (IS_ERR(bdev)) + return PTR_ERR(bdev); + d->bdev = bdev; d->len = i_size_read(d->bdev->bd_inode); d->map = bl_map_simple; -- cgit v1.1