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iomap: switch iomap_fiemap to use iomap_iter 

Rewrite the ->fiemap implementation based on iomap_iter.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
This commit is contained in:
Christoph Hellwig 2021-08-10 18:33:10 -07:00 committed by Darrick J. Wong
parent a6d3d49587
commit 7892386d35
1 changed files with 29 additions and 41 deletions
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70
fs/iomap/fiemap.c
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@ -1,6 +1,6 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2016-2018 Christoph Hellwig.
* Copyright (c) 2016-2021 Christoph Hellwig.
*/
#include <linux/module.h>
#include <linux/compiler.h>
@ -8,13 +8,8 @@
#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)
const struct iomap *iomap, u32 flags)
{
switch (iomap->type) {
case IOMAP_HOLE:
@ -43,24 +38,22 @@ static int iomap_to_fiemap(struct fiemap_extent_info *fi,
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)
static loff_t iomap_fiemap_iter(const struct iomap_iter *iter,
struct fiemap_extent_info *fi, struct iomap *prev)
{
struct fiemap_ctx *ctx = data;
loff_t ret = length;
int ret;
if (iomap->type == IOMAP_HOLE)
return length;
if (iter->iomap.type == IOMAP_HOLE)
return iomap_length(iter);
ret = iomap_to_fiemap(ctx->fi, &ctx->prev, 0);
ctx->prev = *iomap;
ret = iomap_to_fiemap(fi, prev, 0);
*prev = iter->iomap;
switch (ret) {
case 0: /* success */
return length;
return iomap_length(iter);
case 1: /* extent array full */
return 0;
default:
default: /* error */
return ret;
}
}
@ -68,38 +61,33 @@ iomap_fiemap_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
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;
struct iomap_iter iter = {
.inode = inode,
.pos = start,
.len = len,
.flags = IOMAP_REPORT,
};
struct iomap prev = {
.type = IOMAP_HOLE,
};
int ret;
memset(&ctx, 0, sizeof(ctx));
ctx.fi = fi;
ctx.prev.type = IOMAP_HOLE;
ret = fiemap_prep(inode, fi, start, &len, 0);
ret = fiemap_prep(inode, fi, start, &iter.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;
while ((ret = iomap_iter(&iter, ops)) > 0)
iter.processed = iomap_fiemap_iter(&iter, fi, &prev);
start += ret;
len -= ret;
}
if (ctx.prev.type != IOMAP_HOLE) {
ret = iomap_to_fiemap(fi, &ctx.prev, FIEMAP_EXTENT_LAST);
if (prev.type != IOMAP_HOLE) {
ret = iomap_to_fiemap(fi, &prev, FIEMAP_EXTENT_LAST);
if (ret < 0)
return ret;
}
/* inode with no (attribute) mapping will give ENOENT */
if (ret < 0 && ret != -ENOENT)
return ret;
return 0;
}
EXPORT_SYMBOL_GPL(iomap_fiemap);