X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fjournal%2Fjournal-file.c;h=0e33a0fd873e7562a640d50246bb0c9e9e169603;hp=c9030c56addb5e7dac5f6d19c23b9b70d9fae234;hb=b6e676ce41508e2aeea22202fc8f234126177f52;hpb=b9a1617d75c16a48cccf4ff135013dca9af94e7d

diff --git a/src/journal/journal-file.c b/src/journal/journal-file.c
index c9030c56a..0e33a0fd8 100644
--- a/src/journal/journal-file.c
+++ b/src/journal/journal-file.c
@@ -26,6 +26,7 @@
 #include <sys/statvfs.h>
 #include <fcntl.h>
 #include <stddef.h>
+#include <linux/fs.h>
 
 #include "btrfs-util.h"
 #include "journal-def.h"
@@ -33,7 +34,6 @@
 #include "journal-authenticate.h"
 #include "lookup3.h"
 #include "compress.h"
-#include "fsprg.h"
 
 #define DEFAULT_DATA_HASH_TABLE_SIZE (2047ULL*sizeof(HashItem))
 #define DEFAULT_FIELD_HASH_TABLE_SIZE (333ULL*sizeof(HashItem))
@@ -141,8 +141,17 @@ void journal_file_close(JournalFile *f) {
         if (f->mmap && f->fd >= 0)
                 mmap_cache_close_fd(f->mmap, f->fd);
 
-        if (f->fd >= 0 && f->defrag_on_close)
-                btrfs_defrag_fd(f->fd);
+        if (f->fd >= 0 && f->defrag_on_close) {
+
+                /* Be friendly to btrfs: turn COW back on again now,
+                 * and defragment the file. We won't write to the file
+                 * ever again, hence remove all fragmentation, and
+                 * reenable all the good bits COW usually provides
+                 * (such as data checksumming). */
+
+                (void) chattr_fd(f->fd, false, FS_NOCOW_FL);
+                (void) btrfs_defrag_fd(f->fd);
+        }
 
         safe_close(f->fd);
         free(f->path);
@@ -313,7 +322,7 @@ static int journal_file_verify_header(JournalFile *f) {
                 } else if (state == STATE_ARCHIVED)
                         return -ESHUTDOWN;
                 else if (state != STATE_OFFLINE) {
-                        log_debug("Journal file %s has unknown state %u.", f->path, state);
+                        log_debug("Journal file %s has unknown state %i.", f->path, state);
                         return -EBUSY;
                 }
         }
@@ -1953,11 +1962,12 @@ static int test_object_monotonic(JournalFile *f, uint64_t p, uint64_t needle) {
                 return TEST_RIGHT;
 }
 
-static inline int find_data_object_by_boot_id(
+static int find_data_object_by_boot_id(
                 JournalFile *f,
                 sd_id128_t boot_id,
                 Object **o,
                 uint64_t *b) {
+
         char t[sizeof("_BOOT_ID=")-1 + 32 + 1] = "_BOOT_ID=";
 
         sd_id128_to_string(boot_id, t + 9);
@@ -2003,8 +2013,7 @@ void journal_file_reset_location(JournalFile *f) {
         f->current_xor_hash = 0;
 }
 
-void journal_file_save_location(JournalFile *f, direction_t direction, Object *o, uint64_t offset) {
-        f->last_direction = direction;
+void journal_file_save_location(JournalFile *f, Object *o, uint64_t offset) {
         f->location_type = LOCATION_SEEK;
         f->current_offset = offset;
         f->current_seqnum = le64toh(o->entry.seqnum);
@@ -2407,7 +2416,7 @@ void journal_file_dump(JournalFile *f) {
                         break;
 
                 default:
-                        printf("Type: unknown (%u)\n", o->object.type);
+                        printf("Type: unknown (%i)\n", o->object.type);
                         break;
                 }
 
@@ -2591,6 +2600,18 @@ int journal_file_open(
                 goto fail;
 
         if (f->last_stat.st_size == 0 && f->writable) {
+
+                /* Before we write anything, turn off COW logic. Given
+                 * our write pattern that is quite unfriendly to COW
+                 * file systems this should greatly improve
+                 * performance on COW file systems, such as btrfs, at
+                 * the expense of data integrity features (which
+                 * shouldn't be too bad, given that we do our own
+                 * checksumming). */
+                r = chattr_fd(f->fd, true, FS_NOCOW_FL);
+                if (r < 0 && r != -ENOTTY)
+                        log_warning_errno(r, "Failed to set file attributes: %m");
+
                 /* Let's attach the creation time to the journal file,
                  * so that the vacuuming code knows the age of this
                  * file even if the file might end up corrupted one
@@ -2601,7 +2622,7 @@ int journal_file_open(
                  * attributes are not supported we'll just skip this,
                  * and rely solely on mtime/atime/ctime of the file. */
 
-                fd_setcrtime(f->fd, now(CLOCK_REALTIME));
+                fd_setcrtime(f->fd, 0);
 
 #ifdef HAVE_GCRYPT
                 /* Try to load the FSPRG state, and if we can't, then
@@ -2808,6 +2829,8 @@ int journal_file_open_reliably(
 
         /* btrfs doesn't cope well with our write pattern and
          * fragments heavily. Let's defrag all files we rotate */
+
+        (void) chattr_path(p, false, FS_NOCOW_FL);
         (void) btrfs_defrag(p);
 
         log_warning("File %s corrupted or uncleanly shut down, renaming and replacing.", fname);