Christoph Hellwig | 8650b8a | 2015-01-21 11:40:00 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2014 Christoph Hellwig. |
| 3 | */ |
| 4 | #include <linux/exportfs.h> |
| 5 | #include <linux/genhd.h> |
| 6 | #include <linux/slab.h> |
| 7 | |
| 8 | #include <linux/nfsd/debug.h> |
| 9 | |
| 10 | #include "blocklayoutxdr.h" |
| 11 | #include "pnfs.h" |
| 12 | |
| 13 | #define NFSDDBG_FACILITY NFSDDBG_PNFS |
| 14 | |
| 15 | |
| 16 | static int |
| 17 | nfsd4_block_get_device_info_simple(struct super_block *sb, |
| 18 | struct nfsd4_getdeviceinfo *gdp) |
| 19 | { |
| 20 | struct pnfs_block_deviceaddr *dev; |
| 21 | struct pnfs_block_volume *b; |
| 22 | |
| 23 | dev = kzalloc(sizeof(struct pnfs_block_deviceaddr) + |
| 24 | sizeof(struct pnfs_block_volume), GFP_KERNEL); |
| 25 | if (!dev) |
| 26 | return -ENOMEM; |
| 27 | gdp->gd_device = dev; |
| 28 | |
| 29 | dev->nr_volumes = 1; |
| 30 | b = &dev->volumes[0]; |
| 31 | |
| 32 | b->type = PNFS_BLOCK_VOLUME_SIMPLE; |
| 33 | b->simple.sig_len = PNFS_BLOCK_UUID_LEN; |
| 34 | return sb->s_export_op->get_uuid(sb, b->simple.sig, &b->simple.sig_len, |
| 35 | &b->simple.offset); |
| 36 | } |
| 37 | |
| 38 | static __be32 |
| 39 | nfsd4_block_proc_getdeviceinfo(struct super_block *sb, |
| 40 | struct nfsd4_getdeviceinfo *gdp) |
| 41 | { |
| 42 | if (sb->s_bdev != sb->s_bdev->bd_contains) |
| 43 | return nfserr_inval; |
| 44 | return nfserrno(nfsd4_block_get_device_info_simple(sb, gdp)); |
| 45 | } |
| 46 | |
| 47 | static __be32 |
| 48 | nfsd4_block_proc_layoutget(struct inode *inode, const struct svc_fh *fhp, |
| 49 | struct nfsd4_layoutget *args) |
| 50 | { |
| 51 | struct nfsd4_layout_seg *seg = &args->lg_seg; |
| 52 | struct super_block *sb = inode->i_sb; |
| 53 | u32 block_size = (1 << inode->i_blkbits); |
| 54 | struct pnfs_block_extent *bex; |
| 55 | struct iomap iomap; |
| 56 | u32 device_generation = 0; |
| 57 | int error; |
| 58 | |
| 59 | /* |
| 60 | * We do not attempt to support I/O smaller than the fs block size, |
| 61 | * or not aligned to it. |
| 62 | */ |
| 63 | if (args->lg_minlength < block_size) { |
| 64 | dprintk("pnfsd: I/O too small\n"); |
| 65 | goto out_layoutunavailable; |
| 66 | } |
| 67 | if (seg->offset & (block_size - 1)) { |
| 68 | dprintk("pnfsd: I/O misaligned\n"); |
| 69 | goto out_layoutunavailable; |
| 70 | } |
| 71 | |
| 72 | /* |
| 73 | * Some clients barf on non-zero block numbers for NONE or INVALID |
| 74 | * layouts, so make sure to zero the whole structure. |
| 75 | */ |
| 76 | error = -ENOMEM; |
| 77 | bex = kzalloc(sizeof(*bex), GFP_KERNEL); |
| 78 | if (!bex) |
| 79 | goto out_error; |
| 80 | args->lg_content = bex; |
| 81 | |
| 82 | error = sb->s_export_op->map_blocks(inode, seg->offset, seg->length, |
| 83 | &iomap, seg->iomode != IOMODE_READ, |
| 84 | &device_generation); |
| 85 | if (error) { |
| 86 | if (error == -ENXIO) |
| 87 | goto out_layoutunavailable; |
| 88 | goto out_error; |
| 89 | } |
| 90 | |
| 91 | if (iomap.length < args->lg_minlength) { |
| 92 | dprintk("pnfsd: extent smaller than minlength\n"); |
| 93 | goto out_layoutunavailable; |
| 94 | } |
| 95 | |
| 96 | switch (iomap.type) { |
| 97 | case IOMAP_MAPPED: |
| 98 | if (seg->iomode == IOMODE_READ) |
| 99 | bex->es = PNFS_BLOCK_READ_DATA; |
| 100 | else |
| 101 | bex->es = PNFS_BLOCK_READWRITE_DATA; |
| 102 | bex->soff = (iomap.blkno << 9); |
| 103 | break; |
| 104 | case IOMAP_UNWRITTEN: |
| 105 | if (seg->iomode & IOMODE_RW) { |
| 106 | /* |
| 107 | * Crack monkey special case from section 2.3.1. |
| 108 | */ |
| 109 | if (args->lg_minlength == 0) { |
| 110 | dprintk("pnfsd: no soup for you!\n"); |
| 111 | goto out_layoutunavailable; |
| 112 | } |
| 113 | |
| 114 | bex->es = PNFS_BLOCK_INVALID_DATA; |
| 115 | bex->soff = (iomap.blkno << 9); |
| 116 | break; |
| 117 | } |
| 118 | /*FALLTHRU*/ |
| 119 | case IOMAP_HOLE: |
| 120 | if (seg->iomode == IOMODE_READ) { |
| 121 | bex->es = PNFS_BLOCK_NONE_DATA; |
| 122 | break; |
| 123 | } |
| 124 | /*FALLTHRU*/ |
| 125 | case IOMAP_DELALLOC: |
| 126 | default: |
| 127 | WARN(1, "pnfsd: filesystem returned %d extent\n", iomap.type); |
| 128 | goto out_layoutunavailable; |
| 129 | } |
| 130 | |
| 131 | error = nfsd4_set_deviceid(&bex->vol_id, fhp, device_generation); |
| 132 | if (error) |
| 133 | goto out_error; |
| 134 | bex->foff = iomap.offset; |
| 135 | bex->len = iomap.length; |
| 136 | |
| 137 | seg->offset = iomap.offset; |
| 138 | seg->length = iomap.length; |
| 139 | |
| 140 | dprintk("GET: %lld:%lld %d\n", bex->foff, bex->len, bex->es); |
| 141 | return 0; |
| 142 | |
| 143 | out_error: |
| 144 | seg->length = 0; |
| 145 | return nfserrno(error); |
| 146 | out_layoutunavailable: |
| 147 | seg->length = 0; |
| 148 | return nfserr_layoutunavailable; |
| 149 | } |
| 150 | |
| 151 | static __be32 |
| 152 | nfsd4_block_proc_layoutcommit(struct inode *inode, |
| 153 | struct nfsd4_layoutcommit *lcp) |
| 154 | { |
| 155 | loff_t new_size = lcp->lc_last_wr + 1; |
| 156 | struct iattr iattr = { .ia_valid = 0 }; |
| 157 | struct iomap *iomaps; |
| 158 | int nr_iomaps; |
| 159 | int error; |
| 160 | |
| 161 | nr_iomaps = nfsd4_block_decode_layoutupdate(lcp->lc_up_layout, |
| 162 | lcp->lc_up_len, &iomaps, 1 << inode->i_blkbits); |
| 163 | if (nr_iomaps < 0) |
| 164 | return nfserrno(nr_iomaps); |
| 165 | |
| 166 | if (lcp->lc_mtime.tv_nsec == UTIME_NOW || |
| 167 | timespec_compare(&lcp->lc_mtime, &inode->i_mtime) < 0) |
| 168 | lcp->lc_mtime = current_fs_time(inode->i_sb); |
| 169 | iattr.ia_valid |= ATTR_ATIME | ATTR_CTIME | ATTR_MTIME; |
| 170 | iattr.ia_atime = iattr.ia_ctime = iattr.ia_mtime = lcp->lc_mtime; |
| 171 | |
| 172 | if (new_size > i_size_read(inode)) { |
| 173 | iattr.ia_valid |= ATTR_SIZE; |
| 174 | iattr.ia_size = new_size; |
| 175 | } |
| 176 | |
| 177 | error = inode->i_sb->s_export_op->commit_blocks(inode, iomaps, |
| 178 | nr_iomaps, &iattr); |
| 179 | kfree(iomaps); |
| 180 | return nfserrno(error); |
| 181 | } |
| 182 | |
| 183 | const struct nfsd4_layout_ops bl_layout_ops = { |
| 184 | .proc_getdeviceinfo = nfsd4_block_proc_getdeviceinfo, |
| 185 | .encode_getdeviceinfo = nfsd4_block_encode_getdeviceinfo, |
| 186 | .proc_layoutget = nfsd4_block_proc_layoutget, |
| 187 | .encode_layoutget = nfsd4_block_encode_layoutget, |
| 188 | .proc_layoutcommit = nfsd4_block_proc_layoutcommit, |
| 189 | }; |