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import: also set NOCOW for gpt disk images

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Given the write patterns on disk images, we better should turn COW off
for them. In particular as the file systems used inside the disk images
should do their own data integrity checks anyway and we don't need
multiple layers of it.
This commit is contained in:
Lennart Poettering 2015-01-08 01:25:40 +01:00
parent 11689d2a02
commit dfd1520d3a
1 changed files with 10 additions and 1 deletions
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11
src/import/import-gpt.c
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@ -20,6 +20,7 @@
***/
#include <sys/xattr.h>
#include <linux/fs.h>
#include <curl/curl.h>
#include "hashmap.h"
@ -165,7 +166,7 @@ static void gpt_import_file_success(GptImportFile *f) {
f->disk_fd = open(f->final_path, O_RDONLY|O_NOCTTY|O_CLOEXEC);
if (f->disk_fd < 0) {
r = log_error_errno(errno, "Failed top open vendor image: %m");
r = log_error_errno(errno, "Failed to open vendor image: %m");
goto finish;
}
}
@ -186,6 +187,14 @@ static void gpt_import_file_success(GptImportFile *f) {
goto finish;
}
/* Turn off COW writing. This should greatly improve
* performance on COW file systems like btrfs, since it
* reduces fragmentation caused by not allowing in-place
* writes. */
r = chattr_fd(dfd, true, FS_NOCOW_FL);
if (r < 0)
log_warning_errno(errno, "Failed to set file attributes on %s: %m", f->temp_path);
r = copy_bytes(f->disk_fd, dfd, (off_t) -1, true);
if (r < 0) {
log_error_errno(r, "Failed to make writable copy of image: %m");