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mount: size-optimize mount_options[] and nfs_errtbl[]

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777253     974    9676  787903   c05bf busybox_old
 777209     974    9676  787859   c0593 busybox_unstripped
This commit is contained in:
Denis Vlasenko 2007-10-29 19:18:39 +00:00
parent a59f435b5f
commit 63430ae35a
1 changed files with 107 additions and 60 deletions
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167
util-linux/mount.c
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@ -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);