For --rootdir, even for large existing file or block device, it will
always shrink the result filesystem.
The problem is, mkfs.btrfs will try to calculate the dir size, and use
it as @block_count to mkfs, which makes the result filesystem shrinked.
Fix by trying to get the original block device or file size as
@block_count, so mkfs.btrfs can use the full file/block device for
--rootdir option.
Signed-off-by: Qu Wenruo <w...@suse.com>
---
mkfs/main.c | 22 ++++++++++++++++++++--
utils.c | 2 +-
utils.h | 1 +
3 files changed, 22 insertions(+), 3 deletions(-)
diff --git a/mkfs/main.c b/mkfs/main.c
index a34b73bfb845..eeeba9292856 100644
--- a/mkfs/main.c
+++ b/mkfs/main.c
@@ -995,13 +995,31 @@ int main(int argc, char **argv)
* This must be done before minimal device size check.
*/
if (source_dir_set) {
- fd = open(file, O_CREAT | O_RDWR, S_IRUSR | S_IWUSR | S_IRGRP |
- S_IWGRP | S_IROTH);
+ int oflags = O_RDWR;
+ struct stat statbuf;
+
+ if (is_path_exist(file) == 0)
+ oflags |= O_CREAT;
+
+ fd = open(file, oflags , S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP |
+ S_IROTH);
if (fd < 0) {
error("unable to open %s: %s", file, strerror(errno));
goto error;
}
+ ret = fstat(fd, &statbuf);
+ if (ret < 0) {
+ error("unable to stat %s: %s", file, strerror(errno));
+ ret = -errno;
+ goto error;
+ }
+ /*
+ * Block_count not specified, use file/dev size first.
+ * Or we will always use source_dir_size calculated for mkfs.
+ */
+ if (!block_count)
+ block_count = btrfs_device_size(fd, &statbuf);
source_dir_size = btrfs_mkfs_size_dir(source_dir, sectorsize,
min_dev_size, metadata_profile, data_profile);
if (block_count < source_dir_size)
diff --git a/utils.c b/utils.c
index 22c137514592..80071e23fe2b 100644
--- a/utils.c
+++ b/utils.c
@@ -447,7 +447,7 @@ int is_mount_point(const char *path)
return ret;
}
-static int is_reg_file(const char *path)
+int is_reg_file(const char *path)
{
struct stat statbuf;
diff --git a/utils.h b/utils.h
index 860c25d3cdba..bd7484fd3620 100644
--- a/utils.h
+++ b/utils.h
@@ -123,6 +123,7 @@ char *__strncpy_null(char *dest, const char *src, size_t n);
int is_block_device(const char *file);
int is_mount_point(const char *file);
int is_path_exist(const char *file);
+int is_reg_file(const char *path);
int check_arg_type(const char *input);
int open_path_or_dev_mnt(const char *path, DIR **dirstream, int verbose);
int btrfs_open(const char *path, DIR **dirstream, int verbose, int dir_only);
--
2.15.0
--
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