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btrfs-progs: Doc: Add explain on 'source' and 'target' for btrfs-image. 

Add explain on 'source' and 'target', which is somewhat confusing for
users who want to restore dumped image.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
[reworded texts]
Signed-off-by: David Sterba <dsterba@suse.cz>
This commit is contained in:
Qu Wenruo 2014-11-24 15:27:44 +08:00 committed by David Sterba
parent 751fe9b916
commit 39568fa417
2 changed files with 9 additions and 1 deletions
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7
Documentation/btrfs-image.txt
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@ -13,8 +13,13 @@ DESCRIPTION
----------- -----------
*btrfs-image* is used to create an image of a btrfs filesystem. *btrfs-image* is used to create an image of a btrfs filesystem.
All data will be zeroed, but metadata and the like is preserved. All data will be zeroed, but metadata and the like is preserved.
Mainly used for debugging purposes.
In the dump mode, source is the btrfs device/file and target is the output
file (use '-' for stdout).
In the restore mode (option -r), source is the dumped image and target is the btrfs device/file.
Mainly used for debug purpose.
OPTIONS OPTIONS
------- -------

3
btrfs-image.c
View File

@ -2466,6 +2466,9 @@ static void print_usage(void)
fprintf(stderr, "\t-s \tsanitize file names, use once to just use garbage, use twice if you want crc collisions\n"); fprintf(stderr, "\t-s \tsanitize file names, use once to just use garbage, use twice if you want crc collisions\n");
fprintf(stderr, "\t-w \twalk all trees instead of using extent tree, do this if your extent tree is broken\n"); fprintf(stderr, "\t-w \twalk all trees instead of using extent tree, do this if your extent tree is broken\n");
fprintf(stderr, "\t-m \trestore for multiple devices\n"); fprintf(stderr, "\t-m \trestore for multiple devices\n");
fprintf(stderr, "\n");
fprintf(stderr, "\tIn the dump mode, source is the btrfs device and target is the output file (use '-' for stdout).\n");
fprintf(stderr, "\tIn the restore mode, source is the dumped image and target is the btrfs device/file.\n");
exit(1); exit(1);
} }