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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 | // SPDX-License-Identifier: GPL-2.0 /* * Copyright (c) 2016-2018 Christoph Hellwig. */ #include <linux/module.h> #include <linux/compiler.h> #include <linux/fs.h> #include <linux/iomap.h> struct fiemap_ctx { struct fiemap_extent_info *fi; struct iomap prev; }; static int iomap_to_fiemap(struct fiemap_extent_info *fi, struct iomap *iomap, u32 flags) { switch (iomap->type) { case IOMAP_HOLE: /* skip holes */ return 0; case IOMAP_DELALLOC: flags |= FIEMAP_EXTENT_DELALLOC | FIEMAP_EXTENT_UNKNOWN; break; case IOMAP_MAPPED: break; case IOMAP_UNWRITTEN: flags |= FIEMAP_EXTENT_UNWRITTEN; break; case IOMAP_INLINE: flags |= FIEMAP_EXTENT_DATA_INLINE; break; } if (iomap->flags & IOMAP_F_MERGED) flags |= FIEMAP_EXTENT_MERGED; if (iomap->flags & IOMAP_F_SHARED) flags |= FIEMAP_EXTENT_SHARED; return fiemap_fill_next_extent(fi, iomap->offset, iomap->addr != IOMAP_NULL_ADDR ? iomap->addr : 0, iomap->length, flags); } static loff_t iomap_fiemap_actor(struct inode *inode, loff_t pos, loff_t length, void *data, struct iomap *iomap, struct iomap *srcmap) { struct fiemap_ctx *ctx = data; loff_t ret = length; if (iomap->type == IOMAP_HOLE) return length; ret = iomap_to_fiemap(ctx->fi, &ctx->prev, 0); ctx->prev = *iomap; switch (ret) { case 0: /* success */ return length; case 1: /* extent array full */ return 0; default: return ret; } } int iomap_fiemap(struct inode *inode, struct fiemap_extent_info *fi, loff_t start, loff_t len, const struct iomap_ops *ops) { struct fiemap_ctx ctx; loff_t ret; memset(&ctx, 0, sizeof(ctx)); ctx.fi = fi; ctx.prev.type = IOMAP_HOLE; ret = fiemap_check_flags(fi, FIEMAP_FLAG_SYNC); if (ret) return ret; if (fi->fi_flags & FIEMAP_FLAG_SYNC) { ret = filemap_write_and_wait(inode->i_mapping); if (ret) return ret; } while (len > 0) { ret = iomap_apply(inode, start, len, IOMAP_REPORT, ops, &ctx, iomap_fiemap_actor); /* inode with no (attribute) mapping will give ENOENT */ if (ret == -ENOENT) break; if (ret < 0) return ret; if (ret == 0) break; start += ret; len -= ret; } if (ctx.prev.type != IOMAP_HOLE) { ret = iomap_to_fiemap(fi, &ctx.prev, FIEMAP_EXTENT_LAST); if (ret < 0) return ret; } return 0; } EXPORT_SYMBOL_GPL(iomap_fiemap); static loff_t iomap_bmap_actor(struct inode *inode, loff_t pos, loff_t length, void *data, struct iomap *iomap, struct iomap *srcmap) { sector_t *bno = data, addr; if (iomap->type == IOMAP_MAPPED) { addr = (pos - iomap->offset + iomap->addr) >> inode->i_blkbits; if (addr > INT_MAX) WARN(1, "would truncate bmap result\n"); else *bno = addr; } return 0; } /* legacy ->bmap interface. 0 is the error return (!) */ sector_t iomap_bmap(struct address_space *mapping, sector_t bno, const struct iomap_ops *ops) { struct inode *inode = mapping->host; loff_t pos = bno << inode->i_blkbits; unsigned blocksize = i_blocksize(inode); int ret; if (filemap_write_and_wait(mapping)) return 0; bno = 0; ret = iomap_apply(inode, pos, blocksize, 0, ops, &bno, iomap_bmap_actor); if (ret) return 0; return bno; } EXPORT_SYMBOL_GPL(iomap_bmap); |