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authorHarald Hoyer <harald@redhat.com>2013-04-19 11:44:56 (GMT)
committer Harald Hoyer <harald@redhat.com>2013-04-19 11:59:07 (GMT)
commitbdd29249a882e599e5e365536372d08dee398cd4 (patch) (side-by-side diff)
treec746a61af928b7458f00175a06b1a882bac18e74
parentcbeabcfbc5a5fa27385e5794780e8f034e090606 (diff)
downloadsystemd-bdd29249a882e599e5e365536372d08dee398cd4.zip
systemd-bdd29249a882e599e5e365536372d08dee398cd4.tar.gz
Reintroduce f_type comparison macro
This reverts commit 4826f0b7b5c0aefa08b8cc7ef64d69027f84da2c. Because statfs.t_type can be int on some architecures, we have to cast the const magic to the type, otherwise the compiler warns about signed/unsigned comparison, because the magic can be 32 bit unsigned. statfs(2) man page is also wrong on some systems, because f_type is not __SWORD_TYPE on some architecures. The following program: int main(int argc, char**argv) { struct statfs s; statfs(argv[1], &s); printf("sizeof(f_type) = %d\n", sizeof(s.f_type)); printf("sizeof(__SWORD_TYPE) = %d\n", sizeof(__SWORD_TYPE)); printf("sizeof(long) = %d\n", sizeof(long)); printf("sizeof(int) = %d\n", sizeof(int)); if (sizeof(s.f_type) == sizeof(int)) { printf("f_type = 0x%x\n", s.f_type); } else { printf("f_type = 0x%lx\n", s.f_type); } return 0; } executed on s390x gives for a btrfs: sizeof(f_type) = 4 sizeof(__SWORD_TYPE) = 8 sizeof(long) = 8 sizeof(int) = 4 f_type = 0x9123683e
Diffstat (more/less context) (ignore whitespace changes)
-rw-r--r--src/journal/sd-journal.c10
-rw-r--r--src/readahead/readahead-collect.c2
-rw-r--r--src/shared/macro.h7
-rw-r--r--src/shared/util.c5
4 files changed, 16 insertions, 8 deletions
diff --git a/src/journal/sd-journal.c b/src/journal/sd-journal.c
index e021d98..15239b5 100644
--- a/src/journal/sd-journal.c
+++ b/src/journal/sd-journal.c
@@ -1251,11 +1251,11 @@ static void check_network(sd_journal *j, int fd) {
return;
j->on_network =
- sfs.f_type == (__SWORD_TYPE) CIFS_MAGIC_NUMBER ||
- sfs.f_type == (__SWORD_TYPE) CODA_SUPER_MAGIC ||
- sfs.f_type == (__SWORD_TYPE) NCP_SUPER_MAGIC ||
- sfs.f_type == (__SWORD_TYPE) NFS_SUPER_MAGIC ||
- sfs.f_type == (__SWORD_TYPE) SMB_SUPER_MAGIC;
+ F_TYPE_CMP(sfs.f_type, CIFS_MAGIC_NUMBER) ||
+ F_TYPE_CMP(sfs.f_type, CODA_SUPER_MAGIC) ||
+ F_TYPE_CMP(sfs.f_type, NCP_SUPER_MAGIC) ||
+ F_TYPE_CMP(sfs.f_type, NFS_SUPER_MAGIC) ||
+ F_TYPE_CMP(sfs.f_type, SMB_SUPER_MAGIC);
}
static int add_file(sd_journal *j, const char *prefix, const char *filename) {
diff --git a/src/readahead/readahead-collect.c b/src/readahead/readahead-collect.c
index 02ecbe5..75ec5b7 100644
--- a/src/readahead/readahead-collect.c
+++ b/src/readahead/readahead-collect.c
@@ -505,7 +505,7 @@ done:
on_ssd = fs_on_ssd(root) > 0;
log_debug("On SSD: %s", yes_no(on_ssd));
- on_btrfs = statfs(root, &sfs) >= 0 && sfs.f_type == (__SWORD_TYPE) BTRFS_SUPER_MAGIC;
+ on_btrfs = statfs(root, &sfs) >= 0 && F_TYPE_CMP(sfs.f_type, BTRFS_SUPER_MAGIC);
log_debug("On btrfs: %s", yes_no(on_btrfs));
if (asprintf(&pack_fn_new, "%s/.readahead.new", root) < 0) {
diff --git a/src/shared/macro.h b/src/shared/macro.h
index 9bf81dc..ac61b49 100644
--- a/src/shared/macro.h
+++ b/src/shared/macro.h
@@ -264,6 +264,13 @@ do { \
} \
} while(false)
+ /* Because statfs.t_type can be int on some architecures, we have to cast
+ * the const magic to the type, otherwise the compiler warns about
+ * signed/unsigned comparison, because the magic can be 32 bit unsigned.
+ */
+#define F_TYPE_CMP(a, b) (a == (typeof(a)) b)
+
+
/* Returns the number of chars needed to format variables of the
* specified type as a decimal string. Adds in extra space for a
* negative '-' prefix. */
diff --git a/src/shared/util.c b/src/shared/util.c
index 5d03272..1fc6c5a 100644
--- a/src/shared/util.c
+++ b/src/shared/util.c
@@ -2779,8 +2779,9 @@ int rm_rf_children_dangerous(int fd, bool only_dirs, bool honour_sticky, struct
static int is_temporary_fs(struct statfs *s) {
assert(s);
- return s->f_type == (__SWORD_TYPE) TMPFS_MAGIC ||
- s->f_type == (__SWORD_TYPE) RAMFS_MAGIC;
+ return
+ F_TYPE_CMP(s->f_type, TMPFS_MAGIC) ||
+ F_TYPE_CMP(s->f_type, RAMFS_MAGIC);
}
int rm_rf_children(int fd, bool only_dirs, bool honour_sticky, struct stat *root_dev) {