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mount: Prepare fstypes to contain more unsupported FSs

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We will need to parse btrfs stuff, but this one is not
in the supported list yet (as it's bound to hardware).

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Acked-by: Cyrill Gorcunov <gorcunov@openvz.org>
This commit is contained in:
Pavel Emelyanov 2013-12-04 19:51:10 +04:00
parent a5785c94bc
commit b6e2dfd2de
2 changed files with 45 additions and 24 deletions
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1
include/proc_parse.h
View File

@ -93,6 +93,7 @@ struct proc_status_creds {
struct mount_info;
struct fstype {
char *name;
int code;
int (*dump)(struct mount_info *pm);
int (*restore)(struct mount_info *pm);
};

68
mount.c
View File

@ -576,14 +576,34 @@ out:
}
static struct fstype fstypes[] = {
[FSTYPE__UNSUPPORTED] = { "unsupported" },
[FSTYPE__PROC] = { "proc" },
[FSTYPE__SYSFS] = { "sysfs" },
[FSTYPE__DEVTMPFS] = { "devtmpfs" },
[FSTYPE__BINFMT_MISC] = { "binfmt_misc", binfmt_misc_dump },
[FSTYPE__TMPFS] = { "tmpfs", tmpfs_dump, tmpfs_restore },
[FSTYPE__DEVPTS] = { "devpts" },
[FSTYPE__SIMFS] = { "simfs" },
{
.name = "unsupported",
.code = FSTYPE__UNSUPPORTED,
}, {
.name = "proc",
.code = FSTYPE__PROC,
}, {
.name = "sysfs",
.code = FSTYPE__SYSFS,
}, {
.name = "devtmpfs",
.code = FSTYPE__DEVTMPFS,
}, {
.name = "binfmt_misc",
.code = FSTYPE__BINFMT_MISC,
.dump = binfmt_misc_dump,
}, {
.name = "tmpfs",
.code = FSTYPE__TMPFS,
.dump = tmpfs_dump,
.restore = tmpfs_restore,
}, {
.name = "devpts",
.code = FSTYPE__DEVPTS,
}, {
.name = "simfs",
.code = FSTYPE__SIMFS,
}
};
struct fstype *find_fstype_by_name(char *fst)
@ -605,18 +625,18 @@ struct fstype *find_fstype_by_name(char *fst)
return &fstypes[0];
}
static u32 encode_fstype(struct fstype *fst)
{
return fst - fstypes;
}
static struct fstype *decode_fstype(u32 fst)
{
int i;
if (fst >= ARRAY_SIZE(fstypes))
return &fstypes[0];
if (fst == FSTYPE__UNSUPPORTED)
goto uns;
return &fstypes[fst];
for (i = 0; i < ARRAY_SIZE(fstypes); i++)
if (fstypes[i].code == fst)
return fstypes + i;
uns:
return &fstypes[0];
}
static int dump_one_mountpoint(struct mount_info *pm, int fd)
@ -626,8 +646,14 @@ static int dump_one_mountpoint(struct mount_info *pm, int fd)
pr_info("\t%d: %x:%s @ %s\n", pm->mnt_id, pm->s_dev,
pm->root, pm->mountpoint);
me.fstype = encode_fstype(pm->fstype);
if (fstypes[me.fstype].dump && fstypes[me.fstype].dump(pm))
me.fstype = pm->fstype->code;
if ((me.fstype == FSTYPE__UNSUPPORTED) && !is_root_mount(pm)) {
pr_err("FS mnt %s dev %#x root %s unsupported\n",
pm->mountpoint, pm->s_dev, pm->root);
return -1;
}
if (pm->fstype->dump && pm->fstype->dump(pm))
return -1;
me.mnt_id = pm->mnt_id;
@ -643,12 +669,6 @@ static int dump_one_mountpoint(struct mount_info *pm, int fd)
me.master_id = pm->master_id;
me.has_master_id = true;
if (!me.fstype && !is_root_mount(pm)) {
pr_err("FS mnt %s dev %#x root %s unsupported\n",
pm->mountpoint, pm->s_dev, pm->root);
return -1;
}
if (pb_write_one(fd, &me, PB_MNT))
return -1;