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Introduce a function, check_convert_image() to check if that image is rollback-able. This means all file extents except one of the btrfs reserved ranges, must be mapped 1:1 on disk. 1:1 mapped file extents must match the following conditions: 1) Their file_offset(key.offset) matches its disk_bytenr 2) The corresponding chunk must be mapped 1:1 on disk That's to say, it's a SINGLE chunk, and chunk logical matches with stripe physical. Above 2 conditions ensured that file extent lies the exactly the same position as in the old filesystem. For data in reserved ranges of btrfs, they are relocated to new places, and in that case, we use btrfs_read_file() to read out the content for later rollback use. Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> |
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| .. | ||
| common.c | ||
| common.h | ||
| main.c | ||
| Makefile | ||
| source-ext2.c | ||
| source-ext2.h | ||
| source-fs.c | ||
| source-fs.h | ||