| // 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> |
| #include <linux/fiemap.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; |
| *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); |