From 63430ae35ad98d5946851e8a366379dd1574f2a2 Mon Sep 17 00:00:00 2001
From: Denis Vlasenko <vda.linux@googlemail.com>
Date: Mon, 29 Oct 2007 19:18:39 +0000
Subject: mount: size-optimize mount_options[] and nfs_errtbl[]
777253 974 9676 787903 c05bf busybox_old
777209 974 9676 787859 c0593 busybox_unstripped
---
util-linux/mount.c | 167 ++++++++++++++++++++++++++++++++++-------------------
1 file changed, 107 insertions(+), 60 deletions(-)
diff --git a/util-linux/mount.c b/util-linux/mount.c
index fee2f6ee0..1ecdd9529 100644
--- a/util-linux/mount.c
+++ b/util-linux/mount.c
@@ -37,7 +37,7 @@
#if defined(__dietlibc__)
/* 16.12.2006, Sampo Kellomaki (sampo@iki.fi)
* dietlibc-0.30 does not have implementation of getmntent_r() */
-struct mntent *getmntent_r(FILE* stream, struct mntent* result, char* buffer, int bufsize)
+static struct mntent *getmntent_r(FILE* stream, struct mntent* result, char* buffer, int bufsize)
{
struct mntent* ment = getmntent(stream);
memcpy(result, ment, sizeof(struct mntent));
@@ -66,63 +66,105 @@ enum {
/* Standard mount options (from -o options or --options), with corresponding
* flags */
-static const struct {
- const char *name;
- long flags;
-} mount_options[] = {
+static const int32_t mount_options[] = {
// MS_FLAGS set a bit. ~MS_FLAGS disable that bit. 0 flags are NOPs.
USE_FEATURE_MOUNT_LOOP(
- {"loop", 0},
+ /* "loop" */ 0,
)
USE_FEATURE_MOUNT_FSTAB(
- {"defaults", 0},
- /* {"quiet", 0}, - do not filter out, vfat wants to see it */
- {"noauto", MOUNT_NOAUTO},
- {"sw", MOUNT_SWAP},
- {"swap", MOUNT_SWAP},
- USE_DESKTOP({"user", MOUNT_USERS},)
- USE_DESKTOP({"users", MOUNT_USERS},)
+ /* "defaults" */ 0,
+ /* "quiet" 0 - do not filter out, vfat wants to see it */
+ /* "noauto" */ MOUNT_NOAUTO,
+ /* "sw" */ MOUNT_SWAP,
+ /* "swap" */ MOUNT_SWAP,
+ USE_DESKTOP(/* "user" */ MOUNT_USERS,)
+ USE_DESKTOP(/* "users" */ MOUNT_USERS,)
)
USE_FEATURE_MOUNT_FLAGS(
// vfs flags
- {"nosuid", MS_NOSUID},
- {"suid", ~MS_NOSUID},
- {"dev", ~MS_NODEV},
- {"nodev", MS_NODEV},
- {"exec", ~MS_NOEXEC},
- {"noexec", MS_NOEXEC},
- {"sync", MS_SYNCHRONOUS},
- {"async", ~MS_SYNCHRONOUS},
- {"atime", ~MS_NOATIME},
- {"noatime", MS_NOATIME},
- {"diratime", ~MS_NODIRATIME},
- {"nodiratime", MS_NODIRATIME},
- {"loud", ~MS_SILENT},
+ /* "nosuid" */ MS_NOSUID,
+ /* "suid" */ ~MS_NOSUID,
+ /* "dev" */ ~MS_NODEV,
+ /* "nodev" */ MS_NODEV,
+ /* "exec" */ ~MS_NOEXEC,
+ /* "noexec" */ MS_NOEXEC,
+ /* "sync" */ MS_SYNCHRONOUS,
+ /* "async" */ ~MS_SYNCHRONOUS,
+ /* "atime" */ ~MS_NOATIME,
+ /* "noatime" */ MS_NOATIME,
+ /* "diratime" */ ~MS_NODIRATIME,
+ /* "nodiratime" */ MS_NODIRATIME,
+ /* "loud" */ ~MS_SILENT,
// action flags
-
- {"bind", MS_BIND},
- {"move", MS_MOVE},
- {"shared", MS_SHARED},
- {"slave", MS_SLAVE},
- {"private", MS_PRIVATE},
- {"unbindable", MS_UNBINDABLE},
- {"rshared", MS_SHARED|MS_RECURSIVE},
- {"rslave", MS_SLAVE|MS_RECURSIVE},
- {"rprivate", MS_SLAVE|MS_RECURSIVE},
- {"runbindable", MS_UNBINDABLE|MS_RECURSIVE},
+ /* "bind" */ MS_BIND,
+ /* "move" */ MS_MOVE,
+ /* "shared" */ MS_SHARED,
+ /* "slave" */ MS_SLAVE,
+ /* "private" */ MS_PRIVATE,
+ /* "unbindable" */ MS_UNBINDABLE,
+ /* "rshared" */ MS_SHARED|MS_RECURSIVE,
+ /* "rslave" */ MS_SLAVE|MS_RECURSIVE,
+ /* "rprivate" */ MS_SLAVE|MS_RECURSIVE,
+ /* "runbindable" */ MS_UNBINDABLE|MS_RECURSIVE,
)
// Always understood.
-
- {"ro", MS_RDONLY}, // vfs flag
- {"rw", ~MS_RDONLY}, // vfs flag
- {"remount", MS_REMOUNT}, // action flag
+ /* "ro" */ MS_RDONLY, // vfs flag
+ /* "rw" */ ~MS_RDONLY, // vfs flag
+ /* "remount" */ MS_REMOUNT // action flag
};
+static const char mount_option_str[] =
+ USE_FEATURE_MOUNT_LOOP(
+ "loop" "\0"
+ )
+ USE_FEATURE_MOUNT_FSTAB(
+ "defaults" "\0"
+ /* "quiet" "\0" - do not filter out, vfat wants to see it */
+ "noauto" "\0"
+ "sw" "\0"
+ "swap" "\0"
+ USE_DESKTOP("user" "\0")
+ USE_DESKTOP("users" "\0")
+ )
+ USE_FEATURE_MOUNT_FLAGS(
+ // vfs flags
+ "nosuid" "\0"
+ "suid" "\0"
+ "dev" "\0"
+ "nodev" "\0"
+ "exec" "\0"
+ "noexec" "\0"
+ "sync" "\0"
+ "async" "\0"
+ "atime" "\0"
+ "noatime" "\0"
+ "diratime" "\0"
+ "nodiratime" "\0"
+ "loud" "\0"
+
+ // action flags
+ "bind" "\0"
+ "move" "\0"
+ "shared" "\0"
+ "slave" "\0"
+ "private" "\0"
+ "unbindable" "\0"
+ "rshared" "\0"
+ "rslave" "\0"
+ "rprivate" "\0"
+ "runbindable" "\0"
+ )
+
+ // Always understood.
+ "ro" "\0" // vfs flag
+ "rw" "\0" // vfs flag
+ "remount" "\0" // action flag
+;
/* Append mount options to string */
static void append_mount_options(char **oldopts, const char *newopts)
@@ -137,7 +179,7 @@ static void append_mount_options(char **oldopts, const char *newopts)
p = *oldopts;
while (1) {
if (!strncmp(p, newopts, len)
- && (p[len]==',' || p[len]==0))
+ && (p[len] == ',' || p[len] == '\0'))
goto skip;
p = strchr(p,',');
if (!p) break;
@@ -146,7 +188,7 @@ static void append_mount_options(char **oldopts, const char *newopts)
p = xasprintf("%s,%.*s", *oldopts, len, newopts);
free(*oldopts);
*oldopts = p;
-skip:
+ skip:
newopts += len;
while (newopts[0] == ',') newopts++;
}
@@ -166,17 +208,19 @@ static int parse_mount_options(char *options, char **unrecognized)
for (;;) {
int i;
char *comma = strchr(options, ',');
+ const char *option_str = mount_option_str;
- if (comma) *comma = 0;
+ if (comma) *comma = '\0';
// Find this option in mount_options
for (i = 0; i < ARRAY_SIZE(mount_options); i++) {
- if (!strcasecmp(mount_options[i].name, options)) {
- long fl = mount_options[i].flags;
+ if (!strcasecmp(option_str, options)) {
+ long fl = mount_options[i];
if (fl < 0) flags &= fl;
else flags |= fl;
break;
}
+ option_str += strlen(option_str) + 1;
}
// If unrecognized not NULL, append unrecognized mount options */
if (unrecognized && i == ARRAY_SIZE(mount_options)) {
@@ -263,7 +307,7 @@ static int mount_it_now(struct mntent *mp, int vfsflags, char *filteropts)
for (;;) {
rc = mount(mp->mnt_fsname, mp->mnt_dir, mp->mnt_type,
vfsflags, filteropts);
- if (!rc || (vfsflags&MS_RDONLY) || (errno!=EACCES && errno!=EROFS))
+ if (!rc || (vfsflags & MS_RDONLY) || (errno != EACCES && errno != EROFS))
break;
if (!(vfsflags & MS_SILENT))
bb_error_msg("%s is write-protected, mounting read-only",
@@ -282,23 +326,26 @@ static int mount_it_now(struct mntent *mp, int vfsflags, char *filteropts)
if (ENABLE_FEATURE_MTAB_SUPPORT && useMtab && !rc && !(vfsflags & MS_REMOUNT)) {
char *fsname;
FILE *mountTable = setmntent(bb_path_mtab_file, "a+");
+ const char *option_str = mount_option_str;
int i;
if (!mountTable) {
- bb_error_msg("no %s",bb_path_mtab_file);
+ bb_error_msg("no %s", bb_path_mtab_file);
goto ret;
}
// Add vfs string flags
- for (i=0; mount_options[i].flags != MS_REMOUNT; i++)
- if (mount_options[i].flags > 0 && (mount_options[i].flags & vfsflags))
- append_mount_options(&(mp->mnt_opts), mount_options[i].name);
+ for (i = 0; mount_options[i] != MS_REMOUNT; i++) {
+ if (mount_options[i] > 0 && (mount_options[i] & vfsflags))
+ append_mount_options(&(mp->mnt_opts), option_str);
+ option_str += strlen(option_str) + 1;
+ }
// Remove trailing / (if any) from directory we mounted on
i = strlen(mp->mnt_dir) - 1;
- if (i > 0 && mp->mnt_dir[i] == '/') mp->mnt_dir[i] = 0;
+ if (i > 0 && mp->mnt_dir[i] == '/') mp->mnt_dir[i] = '\0';
// Convert to canonical pathnames as needed
@@ -550,8 +597,8 @@ enum {
// Convert each NFSERR_BLAH into EBLAH
static const struct {
- int stat;
- int errnum;
+ short stat;
+ short errnum;
} nfs_errtbl[] = {
{0,0}, {1,EPERM}, {2,ENOENT}, {5,EIO}, {6,ENXIO}, {13,EACCES}, {17,EEXIST},
{19,ENODEV}, {20,ENOTDIR}, {21,EISDIR}, {22,EINVAL}, {27,EFBIG},
@@ -1154,7 +1201,7 @@ static int nfsmount(struct mntent *mp, int vfsflags, char *filteropts)
timeout = time(NULL) + 60 * retry;
prevt = 0;
t = 30;
-retry:
+ retry:
/* be careful not to use too many CPU cycles */
if (t - prevt < 30)
sleep(30);
@@ -1254,7 +1301,7 @@ retry:
goto retry;
}
-prepare_kernel_data:
+ prepare_kernel_data:
if (nfsvers == 2) {
if (status.nfsv2.fhs_status != 0) {
@@ -1349,13 +1396,13 @@ prepare_kernel_data:
}
}
-do_mount: /* perform actual mount */
+ do_mount: /* perform actual mount */
mp->mnt_type = (char*)"nfs";
retval = mount_it_now(mp, vfsflags, (char*)&data);
goto ret;
-fail: /* abort */
+ fail: /* abort */
if (msock >= 0) {
if (mclient) {
@@ -1367,7 +1414,7 @@ fail: /* abort */
if (fsock >= 0)
close(fsock);
-ret:
+ ret:
free(hostname);
free(mounthost);
free(filteropts);
@@ -1756,7 +1803,7 @@ int mount_main(int argc, char **argv)
}
if (ENABLE_FEATURE_CLEAN_UP) endmntent(fstab);
-clean_up:
+ clean_up:
if (ENABLE_FEATURE_CLEAN_UP) {
free(storage_path);
--
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