build-sys: use glibc's xattr support instead of requiring libattr

[elogind.git] / src / journal / journal-vacuum.c

diff --git a/src/journal/journal-vacuum.c b/src/journal/journal-vacuum.c
index 1ddb043e2cd13ccc0bbf4a70984455752382d1fe..086b40f9438b092f7c9892ee7853c2631c04200f 100644 (file)
--- a/src/journal/journal-vacuum.c
+++ b/src/journal/journal-vacuum.c
@@ -24,10 +24,7 @@
 #include <sys/stat.h>
 #include <sys/statvfs.h>
 #include <unistd.h>
-
-#ifdef HAVE_XATTR
-#include <attr/xattr.h>
-#endif
+#include <sys/xattr.h>
 
 #include "journal-def.h"
 #include "journal-file.h"
@@ -79,11 +76,8 @@ static void patch_realtime(
                 unsigned long long *realtime) {
 
         usec_t x;
-
-#ifdef HAVE_XATTR
         uint64_t crtime;
         _cleanup_free_ const char *path = NULL;
-#endif
 
         /* The timestamp was determined by the file name, but let's
          * see if the file might actually be older than the file name
@@ -106,7 +100,6 @@ static void patch_realtime(
         if (x > 0 && x != (usec_t) -1 && x < *realtime)
                 *realtime = x;
 
-#ifdef HAVE_XATTR
         /* Let's read the original creation time, if possible. Ideally
          * we'd just query the creation time the FS might provide, but
          * unfortunately there's currently no sane API to query
@@ -125,13 +118,30 @@ static void patch_realtime(
                 if (crtime > 0 && crtime != (uint64_t) -1 && crtime < *realtime)
                         *realtime = crtime;
         }
-#endif
+}
+
+static int journal_file_empty(int dir_fd, const char *name) {
+        int r;
+        le64_t n_entries;
+        _cleanup_close_ int fd;
+
+        fd = openat(dir_fd, name, O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NONBLOCK);
+        if (fd < 0)
+                return -errno;
+
+        if (lseek(fd, offsetof(Header, n_entries), SEEK_SET) < 0)
+                return -errno;
+
+        r = read(fd, &n_entries, sizeof(n_entries));
+        if (r != sizeof(n_entries))
+                return r == 0 ? -EINVAL : -errno;
+
+        return le64toh(n_entries) == 0;
 }
 
 int journal_directory_vacuum(
                 const char *directory,
                 uint64_t max_use,
-                uint64_t min_free,
                 usec_t max_retention_usec,
                 usec_t *oldest_usec) {
 
@@ -140,12 +150,12 @@ int journal_directory_vacuum(
         struct vacuum_info *list = NULL;
         unsigned n_list = 0, i;
         size_t n_allocated = 0;
-        uint64_t sum = 0;
+        uint64_t sum = 0, freed = 0;
         usec_t retention_limit = 0;
 
         assert(directory);
 
-        if (max_use <= 0 && min_free <= 0 && max_retention_usec <= 0)
+        if (max_use <= 0 && max_retention_usec <= 0)
                 return 0;
 
         if (max_retention_usec > 0) {
@@ -161,9 +171,7 @@ int journal_directory_vacuum(
                 return -errno;
 
         for (;;) {
-                int k;
                 struct dirent *de;
-                union dirent_storage buf;
                 size_t q;
                 struct stat st;
                 char *p;
@@ -171,9 +179,10 @@ int journal_directory_vacuum(
                 sd_id128_t seqnum_id;
                 bool have_seqnum;
 
-                k = readdir_r(d, &buf.de, &de);
-                if (k != 0) {
-                        r = -k;
+                errno = 0;
+                de = readdir(d);
+                if (!de && errno != 0) {
+                        r = -errno;
                         goto finish;
                 }
 
@@ -247,7 +256,24 @@ int journal_directory_vacuum(
                         /* We do not vacuum active files or unknown files! */
                         continue;
 
-                patch_realtime(directory, de->d_name, &st, &realtime);
+                if (journal_file_empty(dirfd(d), p)) {
+                        /* Always vacuum empty non-online files. */
+
+                        uint64_t size = 512UL * (uint64_t) st.st_blocks;
+
+                        if (unlinkat(dirfd(d), p, 0) >= 0) {
+                                log_info("Deleted empty journal %s/%s (%"PRIu64" bytes).",
+                                         directory, p, size);
+                                freed += size;
+                        } else if (errno != ENOENT)
+                                log_warning("Failed to delete %s/%s: %m", directory, p);
+
+                        free(p);
+
+                        continue;
+                }
+
+                patch_realtime(directory, p, &st, &realtime);
 
                 GREEDY_REALLOC(list, n_allocated, n_list + 1);
 
@@ -263,8 +289,7 @@ int journal_directory_vacuum(
                 n_list ++;
         }
 
-        if (n_list > 0)
-                qsort(list, n_list, sizeof(struct vacuum_info), vacuum_compare);
+        qsort_safe(list, n_list, sizeof(struct vacuum_info), vacuum_compare);
 
         for (i = 0; i < n_list; i++) {
                 struct statvfs ss;
@@ -275,12 +300,13 @@ int journal_directory_vacuum(
                 }
 
                 if ((max_retention_usec <= 0 || list[i].realtime >= retention_limit) &&
-                    (max_use <= 0 || sum <= max_use) &&
-                    (min_free <= 0 || (uint64_t) ss.f_bavail * (uint64_t) ss.f_bsize >= min_free))
+                    (max_use <= 0 || sum <= max_use))
                         break;
 
                 if (unlinkat(dirfd(d), list[i].filename, 0) >= 0) {
-                        log_debug("Deleted archived journal %s/%s.", directory, list[i].filename);
+                        log_debug("Deleted archived journal %s/%s (%"PRIu64" bytes).",
+                                  directory, list[i].filename, list[i].usage);
+                        freed += list[i].usage;
 
                         if (list[i].usage < sum)
                                 sum -= list[i].usage;
@@ -299,5 +325,7 @@ finish:
                 free(list[i].filename);
         free(list);
 
+        log_debug("Vacuuming done, freed %"PRIu64" bytes", freed);
+
         return r;
 }