diff options
Diffstat (limited to 'fs/iomap/fiemap.c')
-rw-r--r-- | fs/iomap/fiemap.c | 114 |
1 files changed, 45 insertions, 69 deletions
diff --git a/fs/iomap/fiemap.c b/fs/iomap/fiemap.c index bccf305ea9ce..610ca6f1ec9b 100644 --- a/fs/iomap/fiemap.c +++ b/fs/iomap/fiemap.c @@ -1,19 +1,16 @@ // 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> #include <linux/fs.h> #include <linux/iomap.h> - -struct fiemap_ctx { - struct fiemap_extent_info *fi; - struct iomap prev; -}; +#include <linux/fiemap.h> +#include <linux/pagemap.h> 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: @@ -42,107 +39,86 @@ 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; } } int iomap_fiemap(struct inode *inode, struct fiemap_extent_info *fi, - loff_t start, loff_t len, const struct iomap_ops *ops) + 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; + struct iomap_iter iter = { + .inode = inode, + .pos = start, + .len = len, + .flags = IOMAP_REPORT, + }; + struct iomap prev = { + .type = IOMAP_HOLE, + }; + int ret; - ret = fiemap_check_flags(fi, FIEMAP_FLAG_SYNC); + ret = fiemap_prep(inode, fi, start, &iter.len, 0); 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; - } + while ((ret = iomap_iter(&iter, ops)) > 0) + iter.processed = iomap_fiemap_iter(&iter, fi, &prev); - 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); -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; - if (addr > INT_MAX) - WARN(1, "would truncate bmap result\n"); - else - *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); + struct iomap_iter iter = { + .inode = mapping->host, + .pos = (loff_t)bno << mapping->host->i_blkbits, + .len = i_blocksize(mapping->host), + .flags = IOMAP_REPORT, + }; + const unsigned int blkshift = mapping->host->i_blkbits - SECTOR_SHIFT; int ret; if (filemap_write_and_wait(mapping)) return 0; bno = 0; - ret = iomap_apply(inode, pos, blocksize, 0, ops, &bno, - iomap_bmap_actor); + while ((ret = iomap_iter(&iter, ops)) > 0) { + if (iter.iomap.type == IOMAP_MAPPED) + bno = iomap_sector(&iter.iomap, iter.pos) >> blkshift; + /* leave iter.processed unset to abort loop */ + } if (ret) return 0; + return bno; } EXPORT_SYMBOL_GPL(iomap_bmap); |