From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- fs/nfsd/blocklayout.c | 357 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 357 insertions(+) create mode 100644 fs/nfsd/blocklayout.c (limited to 'fs/nfsd/blocklayout.c') diff --git a/fs/nfsd/blocklayout.c b/fs/nfsd/blocklayout.c new file mode 100644 index 000000000..e7e6e78d9 --- /dev/null +++ b/fs/nfsd/blocklayout.c @@ -0,0 +1,357 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2014-2016 Christoph Hellwig. + */ +#include +#include +#include +#include + +#include + +#include "blocklayoutxdr.h" +#include "pnfs.h" +#include "filecache.h" + +#define NFSDDBG_FACILITY NFSDDBG_PNFS + + +static __be32 +nfsd4_block_proc_layoutget(struct inode *inode, const struct svc_fh *fhp, + struct nfsd4_layoutget *args) +{ + struct nfsd4_layout_seg *seg = &args->lg_seg; + struct super_block *sb = inode->i_sb; + u32 block_size = i_blocksize(inode); + struct pnfs_block_extent *bex; + struct iomap iomap; + u32 device_generation = 0; + int error; + + if (seg->offset & (block_size - 1)) { + dprintk("pnfsd: I/O misaligned\n"); + goto out_layoutunavailable; + } + + /* + * Some clients barf on non-zero block numbers for NONE or INVALID + * layouts, so make sure to zero the whole structure. + */ + error = -ENOMEM; + bex = kzalloc(sizeof(*bex), GFP_KERNEL); + if (!bex) + goto out_error; + args->lg_content = bex; + + error = sb->s_export_op->map_blocks(inode, seg->offset, seg->length, + &iomap, seg->iomode != IOMODE_READ, + &device_generation); + if (error) { + if (error == -ENXIO) + goto out_layoutunavailable; + goto out_error; + } + + if (iomap.length < args->lg_minlength) { + dprintk("pnfsd: extent smaller than minlength\n"); + goto out_layoutunavailable; + } + + switch (iomap.type) { + case IOMAP_MAPPED: + if (seg->iomode == IOMODE_READ) + bex->es = PNFS_BLOCK_READ_DATA; + else + bex->es = PNFS_BLOCK_READWRITE_DATA; + bex->soff = iomap.addr; + break; + case IOMAP_UNWRITTEN: + if (seg->iomode & IOMODE_RW) { + /* + * Crack monkey special case from section 2.3.1. + */ + if (args->lg_minlength == 0) { + dprintk("pnfsd: no soup for you!\n"); + goto out_layoutunavailable; + } + + bex->es = PNFS_BLOCK_INVALID_DATA; + bex->soff = iomap.addr; + break; + } + fallthrough; + case IOMAP_HOLE: + if (seg->iomode == IOMODE_READ) { + bex->es = PNFS_BLOCK_NONE_DATA; + break; + } + fallthrough; + case IOMAP_DELALLOC: + default: + WARN(1, "pnfsd: filesystem returned %d extent\n", iomap.type); + goto out_layoutunavailable; + } + + error = nfsd4_set_deviceid(&bex->vol_id, fhp, device_generation); + if (error) + goto out_error; + bex->foff = iomap.offset; + bex->len = iomap.length; + + seg->offset = iomap.offset; + seg->length = iomap.length; + + dprintk("GET: 0x%llx:0x%llx %d\n", bex->foff, bex->len, bex->es); + return 0; + +out_error: + seg->length = 0; + return nfserrno(error); +out_layoutunavailable: + seg->length = 0; + return nfserr_layoutunavailable; +} + +static __be32 +nfsd4_block_commit_blocks(struct inode *inode, struct nfsd4_layoutcommit *lcp, + struct iomap *iomaps, int nr_iomaps) +{ + loff_t new_size = lcp->lc_last_wr + 1; + struct iattr iattr = { .ia_valid = 0 }; + int error; + + if (lcp->lc_mtime.tv_nsec == UTIME_NOW || + timespec64_compare(&lcp->lc_mtime, &inode->i_mtime) < 0) + lcp->lc_mtime = current_time(inode); + iattr.ia_valid |= ATTR_ATIME | ATTR_CTIME | ATTR_MTIME; + iattr.ia_atime = iattr.ia_ctime = iattr.ia_mtime = lcp->lc_mtime; + + if (new_size > i_size_read(inode)) { + iattr.ia_valid |= ATTR_SIZE; + iattr.ia_size = new_size; + } + + error = inode->i_sb->s_export_op->commit_blocks(inode, iomaps, + nr_iomaps, &iattr); + kfree(iomaps); + return nfserrno(error); +} + +#ifdef CONFIG_NFSD_BLOCKLAYOUT +static int +nfsd4_block_get_device_info_simple(struct super_block *sb, + struct nfsd4_getdeviceinfo *gdp) +{ + struct pnfs_block_deviceaddr *dev; + struct pnfs_block_volume *b; + + dev = kzalloc(sizeof(struct pnfs_block_deviceaddr) + + sizeof(struct pnfs_block_volume), GFP_KERNEL); + if (!dev) + return -ENOMEM; + gdp->gd_device = dev; + + dev->nr_volumes = 1; + b = &dev->volumes[0]; + + b->type = PNFS_BLOCK_VOLUME_SIMPLE; + b->simple.sig_len = PNFS_BLOCK_UUID_LEN; + return sb->s_export_op->get_uuid(sb, b->simple.sig, &b->simple.sig_len, + &b->simple.offset); +} + +static __be32 +nfsd4_block_proc_getdeviceinfo(struct super_block *sb, + struct svc_rqst *rqstp, + struct nfs4_client *clp, + struct nfsd4_getdeviceinfo *gdp) +{ + if (bdev_is_partition(sb->s_bdev)) + return nfserr_inval; + return nfserrno(nfsd4_block_get_device_info_simple(sb, gdp)); +} + +static __be32 +nfsd4_block_proc_layoutcommit(struct inode *inode, + struct nfsd4_layoutcommit *lcp) +{ + struct iomap *iomaps; + int nr_iomaps; + + nr_iomaps = nfsd4_block_decode_layoutupdate(lcp->lc_up_layout, + lcp->lc_up_len, &iomaps, i_blocksize(inode)); + if (nr_iomaps < 0) + return nfserrno(nr_iomaps); + + return nfsd4_block_commit_blocks(inode, lcp, iomaps, nr_iomaps); +} + +const struct nfsd4_layout_ops bl_layout_ops = { + /* + * Pretend that we send notification to the client. This is a blatant + * lie to force recent Linux clients to cache our device IDs. + * We rarely ever change the device ID, so the harm of leaking deviceids + * for a while isn't too bad. Unfortunately RFC5661 is a complete mess + * in this regard, but I filed errata 4119 for this a while ago, and + * hopefully the Linux client will eventually start caching deviceids + * without this again. + */ + .notify_types = + NOTIFY_DEVICEID4_DELETE | NOTIFY_DEVICEID4_CHANGE, + .proc_getdeviceinfo = nfsd4_block_proc_getdeviceinfo, + .encode_getdeviceinfo = nfsd4_block_encode_getdeviceinfo, + .proc_layoutget = nfsd4_block_proc_layoutget, + .encode_layoutget = nfsd4_block_encode_layoutget, + .proc_layoutcommit = nfsd4_block_proc_layoutcommit, +}; +#endif /* CONFIG_NFSD_BLOCKLAYOUT */ + +#ifdef CONFIG_NFSD_SCSILAYOUT +#define NFSD_MDS_PR_KEY 0x0100000000000000ULL + +/* + * We use the client ID as a unique key for the reservations. + * This allows us to easily fence a client when recalls fail. + */ +static u64 nfsd4_scsi_pr_key(struct nfs4_client *clp) +{ + return ((u64)clp->cl_clientid.cl_boot << 32) | clp->cl_clientid.cl_id; +} + +static const u8 designator_types[] = { + PS_DESIGNATOR_EUI64, + PS_DESIGNATOR_NAA, +}; + +static int +nfsd4_block_get_unique_id(struct gendisk *disk, struct pnfs_block_volume *b) +{ + int ret, i; + + for (i = 0; i < ARRAY_SIZE(designator_types); i++) { + u8 type = designator_types[i]; + + ret = disk->fops->get_unique_id(disk, b->scsi.designator, type); + if (ret > 0) { + b->scsi.code_set = PS_CODE_SET_BINARY; + b->scsi.designator_type = type; + b->scsi.designator_len = ret; + return 0; + } + } + + return -EINVAL; +} + +static int +nfsd4_block_get_device_info_scsi(struct super_block *sb, + struct nfs4_client *clp, + struct nfsd4_getdeviceinfo *gdp) +{ + struct pnfs_block_deviceaddr *dev; + struct pnfs_block_volume *b; + const struct pr_ops *ops; + int ret; + + dev = kzalloc(sizeof(struct pnfs_block_deviceaddr) + + sizeof(struct pnfs_block_volume), GFP_KERNEL); + if (!dev) + return -ENOMEM; + gdp->gd_device = dev; + + dev->nr_volumes = 1; + b = &dev->volumes[0]; + + b->type = PNFS_BLOCK_VOLUME_SCSI; + b->scsi.pr_key = nfsd4_scsi_pr_key(clp); + + ret = nfsd4_block_get_unique_id(sb->s_bdev->bd_disk, b); + if (ret < 0) + goto out_free_dev; + + ret = -EINVAL; + ops = sb->s_bdev->bd_disk->fops->pr_ops; + if (!ops) { + pr_err("pNFS: device %s does not support PRs.\n", + sb->s_id); + goto out_free_dev; + } + + ret = ops->pr_register(sb->s_bdev, 0, NFSD_MDS_PR_KEY, true); + if (ret) { + pr_err("pNFS: failed to register key for device %s.\n", + sb->s_id); + goto out_free_dev; + } + + ret = ops->pr_reserve(sb->s_bdev, NFSD_MDS_PR_KEY, + PR_EXCLUSIVE_ACCESS_REG_ONLY, 0); + if (ret) { + pr_err("pNFS: failed to reserve device %s.\n", + sb->s_id); + goto out_free_dev; + } + + return 0; + +out_free_dev: + kfree(dev); + gdp->gd_device = NULL; + return ret; +} + +static __be32 +nfsd4_scsi_proc_getdeviceinfo(struct super_block *sb, + struct svc_rqst *rqstp, + struct nfs4_client *clp, + struct nfsd4_getdeviceinfo *gdp) +{ + if (bdev_is_partition(sb->s_bdev)) + return nfserr_inval; + return nfserrno(nfsd4_block_get_device_info_scsi(sb, clp, gdp)); +} +static __be32 +nfsd4_scsi_proc_layoutcommit(struct inode *inode, + struct nfsd4_layoutcommit *lcp) +{ + struct iomap *iomaps; + int nr_iomaps; + + nr_iomaps = nfsd4_scsi_decode_layoutupdate(lcp->lc_up_layout, + lcp->lc_up_len, &iomaps, i_blocksize(inode)); + if (nr_iomaps < 0) + return nfserrno(nr_iomaps); + + return nfsd4_block_commit_blocks(inode, lcp, iomaps, nr_iomaps); +} + +static void +nfsd4_scsi_fence_client(struct nfs4_layout_stateid *ls) +{ + struct nfs4_client *clp = ls->ls_stid.sc_client; + struct block_device *bdev = ls->ls_file->nf_file->f_path.mnt->mnt_sb->s_bdev; + + bdev->bd_disk->fops->pr_ops->pr_preempt(bdev, NFSD_MDS_PR_KEY, + nfsd4_scsi_pr_key(clp), 0, true); +} + +const struct nfsd4_layout_ops scsi_layout_ops = { + /* + * Pretend that we send notification to the client. This is a blatant + * lie to force recent Linux clients to cache our device IDs. + * We rarely ever change the device ID, so the harm of leaking deviceids + * for a while isn't too bad. Unfortunately RFC5661 is a complete mess + * in this regard, but I filed errata 4119 for this a while ago, and + * hopefully the Linux client will eventually start caching deviceids + * without this again. + */ + .notify_types = + NOTIFY_DEVICEID4_DELETE | NOTIFY_DEVICEID4_CHANGE, + .proc_getdeviceinfo = nfsd4_scsi_proc_getdeviceinfo, + .encode_getdeviceinfo = nfsd4_block_encode_getdeviceinfo, + .proc_layoutget = nfsd4_block_proc_layoutget, + .encode_layoutget = nfsd4_block_encode_layoutget, + .proc_layoutcommit = nfsd4_scsi_proc_layoutcommit, + .fence_client = nfsd4_scsi_fence_client, +}; +#endif /* CONFIG_NFSD_SCSILAYOUT */ -- cgit v1.2.3