VisionFive2 Linux kernel

5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700   1) // SPDX-License-Identifier: GPL-2.0
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700   2) /*
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700   3)  * Copyright (c) 2016-2018 Christoph Hellwig.
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700   4)  */
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700   5) #include <linux/module.h>
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700   6) #include <linux/compiler.h>
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700   7) #include <linux/fs.h>
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700   8) #include <linux/iomap.h>
10c5db286452b (Christoph Hellwig 2020-05-23 09:30:11 +0200   9) #include <linux/fiemap.h>
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  10) 
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  11) struct fiemap_ctx {
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  12) 	struct fiemap_extent_info *fi;
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  13) 	struct iomap prev;
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  14) };
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  15) 
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  16) static int iomap_to_fiemap(struct fiemap_extent_info *fi,
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  17) 		struct iomap *iomap, u32 flags)
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  18) {
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  19) 	switch (iomap->type) {
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  20) 	case IOMAP_HOLE:
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  21) 		/* skip holes */
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  22) 		return 0;
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  23) 	case IOMAP_DELALLOC:
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  24) 		flags |= FIEMAP_EXTENT_DELALLOC | FIEMAP_EXTENT_UNKNOWN;
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  25) 		break;
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  26) 	case IOMAP_MAPPED:
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  27) 		break;
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  28) 	case IOMAP_UNWRITTEN:
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  29) 		flags |= FIEMAP_EXTENT_UNWRITTEN;
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  30) 		break;
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  31) 	case IOMAP_INLINE:
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  32) 		flags |= FIEMAP_EXTENT_DATA_INLINE;
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  33) 		break;
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  34) 	}
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  35) 
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  36) 	if (iomap->flags & IOMAP_F_MERGED)
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  37) 		flags |= FIEMAP_EXTENT_MERGED;
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  38) 	if (iomap->flags & IOMAP_F_SHARED)
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  39) 		flags |= FIEMAP_EXTENT_SHARED;
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  40) 
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  41) 	return fiemap_fill_next_extent(fi, iomap->offset,
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  42) 			iomap->addr != IOMAP_NULL_ADDR ? iomap->addr : 0,
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  43) 			iomap->length, flags);
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  44) }
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  45) 
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  46) static loff_t
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  47) iomap_fiemap_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
c039b99792726 (Goldwyn Rodrigues 2019-10-18 16:44:10 -0700  48) 		struct iomap *iomap, struct iomap *srcmap)
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  49) {
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  50) 	struct fiemap_ctx *ctx = data;
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  51) 	loff_t ret = length;
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  52) 
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  53) 	if (iomap->type == IOMAP_HOLE)
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  54) 		return length;
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  55) 
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  56) 	ret = iomap_to_fiemap(ctx->fi, &ctx->prev, 0);
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  57) 	ctx->prev = *iomap;
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  58) 	switch (ret) {
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  59) 	case 0:		/* success */
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  60) 		return length;
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  61) 	case 1:		/* extent array full */
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  62) 		return 0;
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  63) 	default:
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  64) 		return ret;
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  65) 	}
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  66) }
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  67) 
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  68) int iomap_fiemap(struct inode *inode, struct fiemap_extent_info *fi,
2732881894714 (Christoph Hellwig 2020-05-23 09:30:12 +0200  69) 		u64 start, u64 len, const struct iomap_ops *ops)
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  70) {
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  71) 	struct fiemap_ctx ctx;
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  72) 	loff_t ret;
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  73) 
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  74) 	memset(&ctx, 0, sizeof(ctx));
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  75) 	ctx.fi = fi;
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  76) 	ctx.prev.type = IOMAP_HOLE;
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  77) 
45dd052e67ad1 (Christoph Hellwig 2020-05-23 09:30:14 +0200  78) 	ret = fiemap_prep(inode, fi, start, &len, 0);
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  79) 	if (ret)
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  80) 		return ret;
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  81) 
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  82) 	while (len > 0) {
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  83) 		ret = iomap_apply(inode, start, len, IOMAP_REPORT, ops, &ctx,
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  84) 				iomap_fiemap_actor);
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  85) 		/* inode with no (attribute) mapping will give ENOENT */
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  86) 		if (ret == -ENOENT)
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  87) 			break;
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  88) 		if (ret < 0)
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  89) 			return ret;
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  90) 		if (ret == 0)
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  91) 			break;
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  92) 
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  93) 		start += ret;
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  94) 		len -= ret;
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  95) 	}
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  96) 
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  97) 	if (ctx.prev.type != IOMAP_HOLE) {
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  98) 		ret = iomap_to_fiemap(fi, &ctx.prev, FIEMAP_EXTENT_LAST);
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700  99) 		if (ret < 0)
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700 100) 			return ret;
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700 101) 	}
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700 102) 
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700 103) 	return 0;
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700 104) }
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700 105) EXPORT_SYMBOL_GPL(iomap_fiemap);
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700 106) 
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700 107) static loff_t
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700 108) iomap_bmap_actor(struct inode *inode, loff_t pos, loff_t length,
c039b99792726 (Goldwyn Rodrigues 2019-10-18 16:44:10 -0700 109) 		void *data, struct iomap *iomap, struct iomap *srcmap)
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700 110) {
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700 111) 	sector_t *bno = data, addr;
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700 112) 
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700 113) 	if (iomap->type == IOMAP_MAPPED) {
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700 114) 		addr = (pos - iomap->offset + iomap->addr) >> inode->i_blkbits;
b75dfde121299 (Ritesh Harjani    2020-04-30 07:57:46 -0700 115) 		*bno = addr;
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700 116) 	}
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700 117) 	return 0;
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700 118) }
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700 119) 
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700 120) /* legacy ->bmap interface.  0 is the error return (!) */
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700 121) sector_t
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700 122) iomap_bmap(struct address_space *mapping, sector_t bno,
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700 123) 		const struct iomap_ops *ops)
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700 124) {
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700 125) 	struct inode *inode = mapping->host;
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700 126) 	loff_t pos = bno << inode->i_blkbits;
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700 127) 	unsigned blocksize = i_blocksize(inode);
2b91b28e29f64 (Darrick J. Wong   2019-11-07 07:28:18 -0800 128) 	int ret;
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700 129) 
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700 130) 	if (filemap_write_and_wait(mapping))
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700 131) 		return 0;
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700 132) 
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700 133) 	bno = 0;
2b91b28e29f64 (Darrick J. Wong   2019-11-07 07:28:18 -0800 134) 	ret = iomap_apply(inode, pos, blocksize, 0, ops, &bno,
2b91b28e29f64 (Darrick J. Wong   2019-11-07 07:28:18 -0800 135) 			  iomap_bmap_actor);
2b91b28e29f64 (Darrick J. Wong   2019-11-07 07:28:18 -0800 136) 	if (ret)
2b91b28e29f64 (Darrick J. Wong   2019-11-07 07:28:18 -0800 137) 		return 0;
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700 138) 	return bno;
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700 139) }
5157fb8f5ae12 (Darrick J. Wong   2019-07-15 08:50:58 -0700 140) EXPORT_SYMBOL_GPL(iomap_bmap);