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140 lines
2.9 KiB
140 lines
2.9 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (c) 2016-2018 Christoph Hellwig. |
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*/ |
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#include <linux/module.h> |
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#include <linux/compiler.h> |
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#include <linux/fs.h> |
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#include <linux/iomap.h> |
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#include <linux/fiemap.h> |
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struct fiemap_ctx { |
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struct fiemap_extent_info *fi; |
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struct iomap prev; |
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}; |
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static int iomap_to_fiemap(struct fiemap_extent_info *fi, |
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struct iomap *iomap, u32 flags) |
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{ |
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switch (iomap->type) { |
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case IOMAP_HOLE: |
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/* skip holes */ |
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return 0; |
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case IOMAP_DELALLOC: |
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flags |= FIEMAP_EXTENT_DELALLOC | FIEMAP_EXTENT_UNKNOWN; |
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break; |
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case IOMAP_MAPPED: |
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break; |
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case IOMAP_UNWRITTEN: |
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flags |= FIEMAP_EXTENT_UNWRITTEN; |
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break; |
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case IOMAP_INLINE: |
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flags |= FIEMAP_EXTENT_DATA_INLINE; |
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break; |
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} |
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if (iomap->flags & IOMAP_F_MERGED) |
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flags |= FIEMAP_EXTENT_MERGED; |
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if (iomap->flags & IOMAP_F_SHARED) |
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flags |= FIEMAP_EXTENT_SHARED; |
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return fiemap_fill_next_extent(fi, iomap->offset, |
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iomap->addr != IOMAP_NULL_ADDR ? iomap->addr : 0, |
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iomap->length, flags); |
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} |
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static loff_t |
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iomap_fiemap_actor(struct inode *inode, loff_t pos, loff_t length, void *data, |
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struct iomap *iomap, struct iomap *srcmap) |
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{ |
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struct fiemap_ctx *ctx = data; |
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loff_t ret = length; |
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if (iomap->type == IOMAP_HOLE) |
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return length; |
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ret = iomap_to_fiemap(ctx->fi, &ctx->prev, 0); |
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ctx->prev = *iomap; |
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switch (ret) { |
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case 0: /* success */ |
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return length; |
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case 1: /* extent array full */ |
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return 0; |
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default: |
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return ret; |
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} |
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} |
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int iomap_fiemap(struct inode *inode, struct fiemap_extent_info *fi, |
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u64 start, u64 len, const struct iomap_ops *ops) |
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{ |
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struct fiemap_ctx ctx; |
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loff_t ret; |
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memset(&ctx, 0, sizeof(ctx)); |
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ctx.fi = fi; |
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ctx.prev.type = IOMAP_HOLE; |
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ret = fiemap_prep(inode, fi, start, &len, 0); |
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if (ret) |
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return ret; |
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while (len > 0) { |
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ret = iomap_apply(inode, start, len, IOMAP_REPORT, ops, &ctx, |
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iomap_fiemap_actor); |
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/* inode with no (attribute) mapping will give ENOENT */ |
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if (ret == -ENOENT) |
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break; |
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if (ret < 0) |
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return ret; |
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if (ret == 0) |
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break; |
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start += ret; |
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len -= ret; |
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} |
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if (ctx.prev.type != IOMAP_HOLE) { |
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ret = iomap_to_fiemap(fi, &ctx.prev, FIEMAP_EXTENT_LAST); |
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if (ret < 0) |
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return ret; |
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} |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(iomap_fiemap); |
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static loff_t |
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iomap_bmap_actor(struct inode *inode, loff_t pos, loff_t length, |
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void *data, struct iomap *iomap, struct iomap *srcmap) |
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{ |
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sector_t *bno = data, addr; |
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if (iomap->type == IOMAP_MAPPED) { |
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addr = (pos - iomap->offset + iomap->addr) >> inode->i_blkbits; |
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*bno = addr; |
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} |
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return 0; |
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} |
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/* legacy ->bmap interface. 0 is the error return (!) */ |
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sector_t |
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iomap_bmap(struct address_space *mapping, sector_t bno, |
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const struct iomap_ops *ops) |
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{ |
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struct inode *inode = mapping->host; |
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loff_t pos = bno << inode->i_blkbits; |
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unsigned blocksize = i_blocksize(inode); |
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int ret; |
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if (filemap_write_and_wait(mapping)) |
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return 0; |
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bno = 0; |
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ret = iomap_apply(inode, pos, blocksize, 0, ops, &bno, |
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iomap_bmap_actor); |
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if (ret) |
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return 0; |
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return bno; |
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} |
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EXPORT_SYMBOL_GPL(iomap_bmap);
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