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![Linus Torvalds](/assets/img/avatar_default.png)
two data corruption bugs involving DAX, as well as a corruption bug after a crash during a racing fallocate and delayed allocation. Finally, a number of cleanups and optimizations. -----BEGIN PGP SIGNATURE----- iQEzBAABCAAdFiEEK2m5VNv+CHkogTfJ8vlZVpUNgaMFAloJCiEACgkQ8vlZVpUN gaOahAgAhcgdPagn/B5w+6vKFdH+hOJLKyGI0adGDyWD9YBXN0wFQvliVgXrTKei hxW2GdQGc6yHv9mOjvD+4Fn2AnTZk8F3GtG6zdqRM08JGF/IN2Jax2boczG/XnUz rT9cd3ic2Ff0KaUX+Yos55QwomTh5CAeRPgvB69o9D6L4VJzTlsWKSOBR19FmrSG NDmzZibgWmHcqzW9Bq8ZrXXx+KB42kUlc8tYYm2n6MTaE0LMvp3d9XcFcnm/I7Bk MGa2d3/3FArGD6Rkl/E82MXMSElOHJnY6jGYSDaadUeMI5FXkA6tECOSJYXqShdb ZJwkOBwfv2lbYZJxIBJTy/iA6zdsoQ== =ZzaJ -----END PGP SIGNATURE----- Merge tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 Pull ext4 updates from Ted Ts'o: - Add support for online resizing of file systems with bigalloc - Fix a two data corruption bugs involving DAX, as well as a corruption bug after a crash during a racing fallocate and delayed allocation. - Finally, a number of cleanups and optimizations. * tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: ext4: improve smp scalability for inode generation ext4: add support for online resizing with bigalloc ext4: mention noload when recovering on read-only device Documentation: fix little inconsistencies ext4: convert timers to use timer_setup() jbd2: convert timers to use timer_setup() ext4: remove duplicate extended attributes defs ext4: add ext4_should_use_dax() ext4: add sanity check for encryption + DAX ext4: prevent data corruption with journaling + DAX ext4: prevent data corruption with inline data + DAX ext4: fix interaction between i_size, fallocate, and delalloc after a crash ext4: retry allocations conservatively ext4: Switch to iomap for SEEK_HOLE / SEEK_DATA ext4: Add iomap support for inline data iomap: Add IOMAP_F_DATA_INLINE flag iomap: Switch from blkno to disk offset
418 lines
11 KiB
C
418 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2014-2016 Christoph Hellwig.
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*/
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#include <linux/exportfs.h>
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#include <linux/iomap.h>
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#include <linux/genhd.h>
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#include <linux/slab.h>
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#include <linux/pr.h>
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#include <linux/nfsd/debug.h>
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#include <scsi/scsi_proto.h>
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#include <scsi/scsi_common.h>
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#include <scsi/scsi_request.h>
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#include "blocklayoutxdr.h"
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#include "pnfs.h"
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#define NFSDDBG_FACILITY NFSDDBG_PNFS
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static __be32
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nfsd4_block_proc_layoutget(struct inode *inode, const struct svc_fh *fhp,
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struct nfsd4_layoutget *args)
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{
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struct nfsd4_layout_seg *seg = &args->lg_seg;
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struct super_block *sb = inode->i_sb;
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u32 block_size = i_blocksize(inode);
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struct pnfs_block_extent *bex;
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struct iomap iomap;
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u32 device_generation = 0;
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int error;
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if (seg->offset & (block_size - 1)) {
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dprintk("pnfsd: I/O misaligned\n");
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goto out_layoutunavailable;
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}
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/*
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* Some clients barf on non-zero block numbers for NONE or INVALID
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* layouts, so make sure to zero the whole structure.
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*/
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error = -ENOMEM;
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bex = kzalloc(sizeof(*bex), GFP_KERNEL);
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if (!bex)
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goto out_error;
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args->lg_content = bex;
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error = sb->s_export_op->map_blocks(inode, seg->offset, seg->length,
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&iomap, seg->iomode != IOMODE_READ,
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&device_generation);
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if (error) {
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if (error == -ENXIO)
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goto out_layoutunavailable;
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goto out_error;
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}
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if (iomap.length < args->lg_minlength) {
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dprintk("pnfsd: extent smaller than minlength\n");
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goto out_layoutunavailable;
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}
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switch (iomap.type) {
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case IOMAP_MAPPED:
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if (seg->iomode == IOMODE_READ)
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bex->es = PNFS_BLOCK_READ_DATA;
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else
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bex->es = PNFS_BLOCK_READWRITE_DATA;
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bex->soff = iomap.addr;
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break;
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case IOMAP_UNWRITTEN:
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if (seg->iomode & IOMODE_RW) {
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/*
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* Crack monkey special case from section 2.3.1.
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*/
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if (args->lg_minlength == 0) {
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dprintk("pnfsd: no soup for you!\n");
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goto out_layoutunavailable;
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}
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bex->es = PNFS_BLOCK_INVALID_DATA;
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bex->soff = iomap.addr;
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break;
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}
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/*FALLTHRU*/
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case IOMAP_HOLE:
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if (seg->iomode == IOMODE_READ) {
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bex->es = PNFS_BLOCK_NONE_DATA;
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break;
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}
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/*FALLTHRU*/
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case IOMAP_DELALLOC:
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default:
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WARN(1, "pnfsd: filesystem returned %d extent\n", iomap.type);
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goto out_layoutunavailable;
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}
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error = nfsd4_set_deviceid(&bex->vol_id, fhp, device_generation);
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if (error)
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goto out_error;
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bex->foff = iomap.offset;
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bex->len = iomap.length;
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seg->offset = iomap.offset;
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seg->length = iomap.length;
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dprintk("GET: 0x%llx:0x%llx %d\n", bex->foff, bex->len, bex->es);
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return 0;
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out_error:
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seg->length = 0;
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return nfserrno(error);
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out_layoutunavailable:
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seg->length = 0;
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return nfserr_layoutunavailable;
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}
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static __be32
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nfsd4_block_commit_blocks(struct inode *inode, struct nfsd4_layoutcommit *lcp,
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struct iomap *iomaps, int nr_iomaps)
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{
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loff_t new_size = lcp->lc_last_wr + 1;
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struct iattr iattr = { .ia_valid = 0 };
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int error;
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if (lcp->lc_mtime.tv_nsec == UTIME_NOW ||
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timespec_compare(&lcp->lc_mtime, &inode->i_mtime) < 0)
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lcp->lc_mtime = current_time(inode);
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iattr.ia_valid |= ATTR_ATIME | ATTR_CTIME | ATTR_MTIME;
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iattr.ia_atime = iattr.ia_ctime = iattr.ia_mtime = lcp->lc_mtime;
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if (new_size > i_size_read(inode)) {
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iattr.ia_valid |= ATTR_SIZE;
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iattr.ia_size = new_size;
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}
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error = inode->i_sb->s_export_op->commit_blocks(inode, iomaps,
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nr_iomaps, &iattr);
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kfree(iomaps);
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return nfserrno(error);
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}
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#ifdef CONFIG_NFSD_BLOCKLAYOUT
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static int
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nfsd4_block_get_device_info_simple(struct super_block *sb,
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struct nfsd4_getdeviceinfo *gdp)
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{
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struct pnfs_block_deviceaddr *dev;
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struct pnfs_block_volume *b;
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dev = kzalloc(sizeof(struct pnfs_block_deviceaddr) +
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sizeof(struct pnfs_block_volume), GFP_KERNEL);
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if (!dev)
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return -ENOMEM;
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gdp->gd_device = dev;
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dev->nr_volumes = 1;
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b = &dev->volumes[0];
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b->type = PNFS_BLOCK_VOLUME_SIMPLE;
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b->simple.sig_len = PNFS_BLOCK_UUID_LEN;
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return sb->s_export_op->get_uuid(sb, b->simple.sig, &b->simple.sig_len,
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&b->simple.offset);
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}
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static __be32
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nfsd4_block_proc_getdeviceinfo(struct super_block *sb,
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struct svc_rqst *rqstp,
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struct nfs4_client *clp,
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struct nfsd4_getdeviceinfo *gdp)
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{
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if (sb->s_bdev != sb->s_bdev->bd_contains)
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return nfserr_inval;
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return nfserrno(nfsd4_block_get_device_info_simple(sb, gdp));
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}
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static __be32
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nfsd4_block_proc_layoutcommit(struct inode *inode,
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struct nfsd4_layoutcommit *lcp)
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{
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struct iomap *iomaps;
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int nr_iomaps;
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nr_iomaps = nfsd4_block_decode_layoutupdate(lcp->lc_up_layout,
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lcp->lc_up_len, &iomaps, i_blocksize(inode));
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if (nr_iomaps < 0)
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return nfserrno(nr_iomaps);
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return nfsd4_block_commit_blocks(inode, lcp, iomaps, nr_iomaps);
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}
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const struct nfsd4_layout_ops bl_layout_ops = {
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/*
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* Pretend that we send notification to the client. This is a blatant
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* lie to force recent Linux clients to cache our device IDs.
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* We rarely ever change the device ID, so the harm of leaking deviceids
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* for a while isn't too bad. Unfortunately RFC5661 is a complete mess
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* in this regard, but I filed errata 4119 for this a while ago, and
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* hopefully the Linux client will eventually start caching deviceids
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* without this again.
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*/
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.notify_types =
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NOTIFY_DEVICEID4_DELETE | NOTIFY_DEVICEID4_CHANGE,
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.proc_getdeviceinfo = nfsd4_block_proc_getdeviceinfo,
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.encode_getdeviceinfo = nfsd4_block_encode_getdeviceinfo,
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.proc_layoutget = nfsd4_block_proc_layoutget,
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.encode_layoutget = nfsd4_block_encode_layoutget,
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.proc_layoutcommit = nfsd4_block_proc_layoutcommit,
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};
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#endif /* CONFIG_NFSD_BLOCKLAYOUT */
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#ifdef CONFIG_NFSD_SCSILAYOUT
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static int nfsd4_scsi_identify_device(struct block_device *bdev,
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struct pnfs_block_volume *b)
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{
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struct request_queue *q = bdev->bd_disk->queue;
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struct request *rq;
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struct scsi_request *req;
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size_t bufflen = 252, len, id_len;
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u8 *buf, *d, type, assoc;
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int error;
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if (WARN_ON_ONCE(!blk_queue_scsi_passthrough(q)))
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return -EINVAL;
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buf = kzalloc(bufflen, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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rq = blk_get_request(q, REQ_OP_SCSI_IN, GFP_KERNEL);
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if (IS_ERR(rq)) {
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error = -ENOMEM;
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goto out_free_buf;
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}
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req = scsi_req(rq);
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error = blk_rq_map_kern(q, rq, buf, bufflen, GFP_KERNEL);
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if (error)
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goto out_put_request;
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req->cmd[0] = INQUIRY;
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req->cmd[1] = 1;
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req->cmd[2] = 0x83;
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req->cmd[3] = bufflen >> 8;
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req->cmd[4] = bufflen & 0xff;
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req->cmd_len = COMMAND_SIZE(INQUIRY);
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blk_execute_rq(rq->q, NULL, rq, 1);
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if (req->result) {
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pr_err("pNFS: INQUIRY 0x83 failed with: %x\n",
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req->result);
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error = -EIO;
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goto out_put_request;
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}
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len = (buf[2] << 8) + buf[3] + 4;
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if (len > bufflen) {
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pr_err("pNFS: INQUIRY 0x83 response invalid (len = %zd)\n",
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len);
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goto out_put_request;
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}
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d = buf + 4;
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for (d = buf + 4; d < buf + len; d += id_len + 4) {
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id_len = d[3];
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type = d[1] & 0xf;
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assoc = (d[1] >> 4) & 0x3;
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/*
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* We only care about a EUI-64 and NAA designator types
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* with LU association.
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*/
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if (assoc != 0x00)
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continue;
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if (type != 0x02 && type != 0x03)
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continue;
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if (id_len != 8 && id_len != 12 && id_len != 16)
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continue;
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b->scsi.code_set = PS_CODE_SET_BINARY;
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b->scsi.designator_type = type == 0x02 ?
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PS_DESIGNATOR_EUI64 : PS_DESIGNATOR_NAA;
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b->scsi.designator_len = id_len;
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memcpy(b->scsi.designator, d + 4, id_len);
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/*
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* If we found a 8 or 12 byte descriptor continue on to
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* see if a 16 byte one is available. If we find a
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* 16 byte descriptor we're done.
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*/
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if (id_len == 16)
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break;
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}
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out_put_request:
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blk_put_request(rq);
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out_free_buf:
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kfree(buf);
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return error;
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}
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#define NFSD_MDS_PR_KEY 0x0100000000000000ULL
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/*
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* We use the client ID as a unique key for the reservations.
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* This allows us to easily fence a client when recalls fail.
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*/
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static u64 nfsd4_scsi_pr_key(struct nfs4_client *clp)
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{
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return ((u64)clp->cl_clientid.cl_boot << 32) | clp->cl_clientid.cl_id;
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}
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static int
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nfsd4_block_get_device_info_scsi(struct super_block *sb,
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struct nfs4_client *clp,
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struct nfsd4_getdeviceinfo *gdp)
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{
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struct pnfs_block_deviceaddr *dev;
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struct pnfs_block_volume *b;
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const struct pr_ops *ops;
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int error;
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dev = kzalloc(sizeof(struct pnfs_block_deviceaddr) +
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sizeof(struct pnfs_block_volume), GFP_KERNEL);
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if (!dev)
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return -ENOMEM;
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gdp->gd_device = dev;
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dev->nr_volumes = 1;
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b = &dev->volumes[0];
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b->type = PNFS_BLOCK_VOLUME_SCSI;
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b->scsi.pr_key = nfsd4_scsi_pr_key(clp);
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error = nfsd4_scsi_identify_device(sb->s_bdev, b);
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if (error)
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return error;
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ops = sb->s_bdev->bd_disk->fops->pr_ops;
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if (!ops) {
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pr_err("pNFS: device %s does not support PRs.\n",
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sb->s_id);
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return -EINVAL;
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}
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error = ops->pr_register(sb->s_bdev, 0, NFSD_MDS_PR_KEY, true);
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if (error) {
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pr_err("pNFS: failed to register key for device %s.\n",
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sb->s_id);
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return -EINVAL;
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}
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error = ops->pr_reserve(sb->s_bdev, NFSD_MDS_PR_KEY,
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PR_EXCLUSIVE_ACCESS_REG_ONLY, 0);
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if (error) {
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pr_err("pNFS: failed to reserve device %s.\n",
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sb->s_id);
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return -EINVAL;
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}
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return 0;
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}
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static __be32
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nfsd4_scsi_proc_getdeviceinfo(struct super_block *sb,
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struct svc_rqst *rqstp,
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struct nfs4_client *clp,
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struct nfsd4_getdeviceinfo *gdp)
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{
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if (sb->s_bdev != sb->s_bdev->bd_contains)
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return nfserr_inval;
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return nfserrno(nfsd4_block_get_device_info_scsi(sb, clp, gdp));
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}
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static __be32
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nfsd4_scsi_proc_layoutcommit(struct inode *inode,
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struct nfsd4_layoutcommit *lcp)
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{
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struct iomap *iomaps;
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int nr_iomaps;
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nr_iomaps = nfsd4_scsi_decode_layoutupdate(lcp->lc_up_layout,
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lcp->lc_up_len, &iomaps, i_blocksize(inode));
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if (nr_iomaps < 0)
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return nfserrno(nr_iomaps);
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return nfsd4_block_commit_blocks(inode, lcp, iomaps, nr_iomaps);
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}
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static void
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nfsd4_scsi_fence_client(struct nfs4_layout_stateid *ls)
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{
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struct nfs4_client *clp = ls->ls_stid.sc_client;
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struct block_device *bdev = ls->ls_file->f_path.mnt->mnt_sb->s_bdev;
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bdev->bd_disk->fops->pr_ops->pr_preempt(bdev, NFSD_MDS_PR_KEY,
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nfsd4_scsi_pr_key(clp), 0, true);
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}
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const struct nfsd4_layout_ops scsi_layout_ops = {
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/*
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* Pretend that we send notification to the client. This is a blatant
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* lie to force recent Linux clients to cache our device IDs.
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|
* We rarely ever change the device ID, so the harm of leaking deviceids
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|
* for a while isn't too bad. Unfortunately RFC5661 is a complete mess
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* in this regard, but I filed errata 4119 for this a while ago, and
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* hopefully the Linux client will eventually start caching deviceids
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* without this again.
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*/
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.notify_types =
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NOTIFY_DEVICEID4_DELETE | NOTIFY_DEVICEID4_CHANGE,
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.proc_getdeviceinfo = nfsd4_scsi_proc_getdeviceinfo,
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.encode_getdeviceinfo = nfsd4_block_encode_getdeviceinfo,
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.proc_layoutget = nfsd4_block_proc_layoutget,
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.encode_layoutget = nfsd4_block_encode_layoutget,
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.proc_layoutcommit = nfsd4_scsi_proc_layoutcommit,
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.fence_client = nfsd4_scsi_fence_client,
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};
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#endif /* CONFIG_NFSD_SCSILAYOUT */
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