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Subject[PATCH 1/2] implement uid and gid mount options for ext2
Date
Signed-off-by: Ludwig Nussel <ludwig.nussel@suse.de>
---
Documentation/filesystems/ext2.txt | 6 ++++++
fs/ext2/inode.c | 12 ++++++++++++
fs/ext2/super.c | 35 ++++++++++++++++++++++++++++++++++-
include/linux/ext2_fs_sb.h | 4 ++++
4 files changed, 56 insertions(+), 1 deletions(-)
diff --git a/Documentation/filesystems/ext2.txt b/Documentation/filesystems/ext2.txt
index 67639f9..5501ae0 100644
--- a/Documentation/filesystems/ext2.txt
+++ b/Documentation/filesystems/ext2.txt
@@ -42,6 +42,12 @@ orlov (*) Use the Orlov block allocator.
resuid=n The user ID which may use the reserved blocks.
resgid=n The group ID which may use the reserved blocks.

+uid=n[:m] make all files appear to belong to this is uid.
+ The optional second uid is actually written do disk.
+
+gid=n[:m] make all files appear to belong to this is gid.
+ The optional second gid is actually written do disk.
+
sb=n Use alternate superblock at this location.

user_xattr Enable "user." POSIX Extended Attributes
diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
index e271303..7ceb73c 100644
--- a/fs/ext2/inode.c
+++ b/fs/ext2/inode.c
@@ -1239,6 +1239,12 @@ struct inode *ext2_iget (struct super_block *sb, unsigned long ino)
inode->i_uid |= le16_to_cpu(raw_inode->i_uid_high) << 16;
inode->i_gid |= le16_to_cpu(raw_inode->i_gid_high) << 16;
}
+ if (EXT2_SB(sb)->s_uid) {
+ inode->i_uid = EXT2_SB(sb)->s_uid;
+ }
+ if (EXT2_SB(sb)->s_gid) {
+ inode->i_gid = EXT2_SB(sb)->s_gid;
+ }
inode->i_nlink = le16_to_cpu(raw_inode->i_links_count);
inode->i_size = le32_to_cpu(raw_inode->i_size);
inode->i_atime.tv_sec = (signed)le32_to_cpu(raw_inode->i_atime);
@@ -1353,6 +1359,12 @@ int ext2_write_inode(struct inode *inode, int do_sync)

ext2_get_inode_flags(ei);
raw_inode->i_mode = cpu_to_le16(inode->i_mode);
+ if (EXT2_SB(sb)->s_uid) {
+ uid = EXT2_SB(sb)->s_diskuid;
+ }
+ if (EXT2_SB(sb)->s_gid) {
+ gid = EXT2_SB(sb)->s_diskgid;
+ }
if (!(test_opt(sb, NO_UID32))) {
raw_inode->i_uid_low = cpu_to_le16(low_16_bits(uid));
raw_inode->i_gid_low = cpu_to_le16(low_16_bits(gid));
diff --git a/fs/ext2/super.c b/fs/ext2/super.c
index 1a9ffee..f89b407 100644
--- a/fs/ext2/super.c
+++ b/fs/ext2/super.c
@@ -382,7 +382,8 @@ enum {
Opt_err_ro, Opt_nouid32, Opt_nocheck, Opt_debug,
Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr,
Opt_acl, Opt_noacl, Opt_xip, Opt_ignore, Opt_err, Opt_quota,
- Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation
+ Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation,
+ Opt_uid, Opt_diskuid, Opt_gid, Opt_diskgid
};

static const match_table_t tokens = {
@@ -416,6 +417,10 @@ static const match_table_t tokens = {
{Opt_usrquota, "usrquota"},
{Opt_reservation, "reservation"},
{Opt_noreservation, "noreservation"},
+ {Opt_uid, "uid=%u"},
+ {Opt_diskuid, "uid=%u:%u"},
+ {Opt_gid, "gid=%u"},
+ {Opt_diskgid, "gid=%u:%u"},
{Opt_err, NULL}
};

@@ -556,6 +561,34 @@ static int parse_options (char * options,
clear_opt(sbi->s_mount_opt, RESERVATION);
printk("reservations OFF\n");
break;
+ case Opt_uid:
+ if (match_int(&args[0], &option))
+ return 0;
+ sbi->s_uid = sbi->s_diskuid = option;
+ break;
+ case Opt_diskuid:
+ if (match_int(&args[0], &option))
+ return 0;
+ sbi->s_uid = option;
+
+ if (match_int(&args[1], &option))
+ return 0;
+ sbi->s_diskuid = option;
+ break;
+ case Opt_gid:
+ if (match_int(&args[0], &option))
+ return 0;
+ sbi->s_gid = sbi->s_diskgid = option;
+ break;
+ case Opt_diskgid:
+ if (match_int(&args[0], &option))
+ return 0;
+ sbi->s_gid = option;
+
+ if (match_int(&args[1], &option))
+ return 0;
+ sbi->s_diskgid = option;
+ break;
case Opt_ignore:
break;
default:
diff --git a/include/linux/ext2_fs_sb.h b/include/linux/ext2_fs_sb.h
index 1cdb663..062e8a9 100644
--- a/include/linux/ext2_fs_sb.h
+++ b/include/linux/ext2_fs_sb.h
@@ -88,6 +88,10 @@ struct ext2_sb_info {
unsigned long s_sb_block;
uid_t s_resuid;
gid_t s_resgid;
+ uid_t s_uid; /* make all files appear to belong to this uid */
+ uid_t s_diskuid; /* write this uid to disk (if s_uid != 0) */
+ gid_t s_gid; /* make all files appear to belong to this gid */
+ gid_t s_diskgid; /* write this gid to disk (if s_gid != 0) */
unsigned short s_mount_state;
unsigned short s_pad;
int s_addr_per_block_bits;
--
1.6.2.1


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