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- // 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,
- u64 start, u64 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_prep(inode, fi, start, &len, 0);
- 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);
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