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authorLennart Poettering <lennart@poettering.net>2010-09-23 17:11:19 +0200
committerLennart Poettering <lennart@poettering.net>2010-09-23 17:11:19 +0200
commit746f89063666be8c4d538271c646585ac4fc4353 (patch)
tree23e82ec97c9a014e95485f42a3618f2532bb9fcc
parent0511502083378313767ec4a6b950d124528c21e4 (diff)
readahead: add btrfs defrag support
-rw-r--r--src/missing.h21
-rw-r--r--src/readahead-collect.c35
2 files changed, 44 insertions, 12 deletions
diff --git a/src/missing.h b/src/missing.h
index 539979e1bd..ff5dcb4092 100644
--- a/src/missing.h
+++ b/src/missing.h
@@ -101,4 +101,25 @@ static inline int fanotify_mark(int fanotify_fd, unsigned int flags, uint64_t ma
return syscall(__NR_fanotify_mark, fanotify_fd, flags, mask, dfd, pathname);
}
+#ifndef BTRFS_IOCTL_MAGIC
+#define BTRFS_IOCTL_MAGIC 0x94
+#endif
+
+#ifndef BTRFS_PATH_NAME_MAX
+#define BTRFS_PATH_NAME_MAX 4087
+#endif
+
+struct btrfs_ioctl_vol_args {
+ int64_t fd;
+ char name[BTRFS_PATH_NAME_MAX + 1];
+};
+
+#ifndef BTRFS_IOC_DEFRAG
+#define BTRFS_IOC_DEFRAG _IOW(BTRFS_IOCTL_MAGIC, 2, struct btrfs_ioctl_vol_args)
+#endif
+
+#ifndef BTRFS_SUPER_MAGIC
+#define BTRFS_SUPER_MAGIC 0x9123683E
+#endif
+
#endif
diff --git a/src/readahead-collect.c b/src/readahead-collect.c
index 93a04521f3..5ff3711068 100644
--- a/src/readahead-collect.c
+++ b/src/readahead-collect.c
@@ -39,6 +39,7 @@
#include <linux/fs.h>
#include <linux/fiemap.h>
#include <sys/ioctl.h>
+#include <sys/vfs.h>
#include "missing.h"
#include "util.h"
@@ -47,15 +48,18 @@
#include "ioprio.h"
#include "readahead-common.h"
-/*
- fixme:
+#define MINCORE_VEC_SIZE (READAHEAD_FILE_SIZE_MAX/PAGE_SIZE)
- - BTRFS_IOC_DEFRAG
-*/
+static int btrfs_defrag(int fd) {
+ struct btrfs_ioctl_vol_args data;
-#define MINCORE_VEC_SIZE (READAHEAD_FILE_SIZE_MAX/PAGE_SIZE)
+ zero(data);
+ data.fd = fd;
-static int pack_file(FILE *pack, const char *fn) {
+ return ioctl(fd, BTRFS_IOC_DEFRAG, &data);
+}
+
+static int pack_file(FILE *pack, const char *fn, bool on_btrfs) {
struct stat st;
void *start = MAP_FAILED;
uint8_t vec[MINCORE_VEC_SIZE];
@@ -78,6 +82,9 @@ static int pack_file(FILE *pack, const char *fn) {
goto finish;
}
+ if (on_btrfs)
+ btrfs_defrag(fd);
+
l = PAGE_ALIGN(st.st_size);
if ((start = mmap(NULL, l, PROT_READ, MAP_SHARED, fd, 0)) == MAP_FAILED) {
log_warning("mmap(%s) failed: %m", fn);
@@ -190,7 +197,8 @@ static int collect(const char *root) {
sigset_t mask;
FILE *pack = NULL;
char *pack_fn_new = NULL, *pack_fn = NULL;
- bool on_ssd;
+ bool on_ssd, on_btrfs;
+ struct statfs sfs;
assert(root);
@@ -321,6 +329,9 @@ static int collect(const char *root) {
on_ssd = fs_on_ssd(root);
log_debug("On SSD: %s", yes_no(on_ssd));
+ on_btrfs = statfs(root, &sfs) >= 0 && sfs.f_type == BTRFS_SUPER_MAGIC;
+ log_debug("On btrfs: %s", yes_no(on_btrfs));
+
asprintf(&pack_fn, "%s/.readahead", root);
asprintf(&pack_fn_new, "%s/.readahead.new", root);
@@ -339,13 +350,13 @@ static int collect(const char *root) {
fputs(CANONICAL_HOST "\n", pack);
putc(on_ssd ? 'S' : 'R', pack);
- if (on_ssd) {
+ if (on_ssd || on_btrfs) {
- /* On SSD, just write things out in the order the
- * files where accessed */
+ /* On SSD or on btrfs, just write things out in the
+ * order the files where accessed. */
HASHMAP_FOREACH_KEY(q, p, files, i)
- pack_file(pack, p);
+ pack_file(pack, p, on_btrfs);
} else {
struct item *ordered, *j;
unsigned k, n;
@@ -374,7 +385,7 @@ static int collect(const char *root) {
qsort(ordered, n, sizeof(struct item), qsort_compare);
for (k = 0; k < n; k++)
- pack_file(pack, ordered[k].path);
+ pack_file(pack, ordered[k].path, on_btrfs);
free(ordered);
}