[PATCH vfs-2.6:for-next] Push BKL down into ->remount_fs()

From: Alessio Igor Bogani
Date: Tue May 12 2009 - 09:11:39 EST

Signed-off-by: Alessio Igor Bogani <abogani@xxxxxxxxxx>
---
drivers/isdn/capi/capifs.c | 4 ++++
drivers/usb/core/inode.c | 5 +++++
fs/affs/super.c | 7 ++++++-
fs/btrfs/super.c | 10 ++++++++--
fs/ext2/super.c | 12 ++++++++++--
fs/ext3/super.c | 4 ++++
fs/ext4/super.c | 4 ++++
fs/hpfs/super.c | 4 ++++
fs/jffs2/fs.c | 3 +++
fs/jfs/super.c | 22 ++++++++++++++++++----
fs/nfs/super.c | 2 ++
fs/nilfs2/super.c | 4 ++++
fs/ntfs/super.c | 15 ++++++++++++++-
fs/ocfs2/super.c | 4 ++++
fs/reiserfs/super.c | 4 ++++
fs/super.c | 2 --
fs/ubifs/super.c | 9 ++++++++-
fs/udf/super.c | 6 +++++-
fs/ufs/super.c | 11 ++++++++++-
fs/xfs/linux-2.6/xfs_super.c | 4 ++++
kernel/cgroup.c | 3 +++
mm/shmem.c | 3 +++
22 files changed, 127 insertions(+), 15 deletions(-)

diff --git a/drivers/isdn/capi/capifs.c b/drivers/isdn/capi/capifs.c
index bff72d8..46c89bf 100644
--- a/drivers/isdn/capi/capifs.c
+++ b/drivers/isdn/capi/capifs.c
@@ -16,6 +16,7 @@
#include <linux/init.h>
#include <linux/ctype.h>
#include <linux/sched.h> /* current */
+#include <linux/smp_lock.h>

#include "capifs.h"

@@ -75,6 +76,8 @@ static int capifs_remount(struct super_block *s, int *flags, char *data)
}
}

+ lock_kernel();
+
mutex_lock(&s->s_root->d_inode->i_mutex);

replace_mount_options(s, new_opt);
@@ -86,6 +89,7 @@ static int capifs_remount(struct super_block *s, int *flags, char *data)

mutex_unlock(&s->s_root->d_inode->i_mutex);

+ unlock_kernel();
return 0;
}

diff --git a/drivers/usb/core/inode.c b/drivers/usb/core/inode.c
index dff5760..ffe75e8 100644
--- a/drivers/usb/core/inode.c
+++ b/drivers/usb/core/inode.c
@@ -39,6 +39,7 @@
#include <linux/parser.h>
#include <linux/notifier.h>
#include <linux/seq_file.h>
+#include <linux/smp_lock.h>
#include <asm/byteorder.h>
#include "usb.h"
#include "hcd.h"
@@ -265,9 +266,13 @@ static int remount(struct super_block *sb, int *flags, char *data)
return -EINVAL;
}

+ lock_kernel();
+
if (usbfs_mount && usbfs_mount->mnt_sb)
update_sb(usbfs_mount->mnt_sb);

+ unlock_kernel();
+
return 0;
}

diff --git a/fs/affs/super.c b/fs/affs/super.c
index d738646..a35eb35 100644
--- a/fs/affs/super.c
+++ b/fs/affs/super.c
@@ -16,6 +16,7 @@
#include <linux/parser.h>
#include <linux/magic.h>
#include <linux/sched.h>
+#include <linux/smp_lock.h>
#include "affs.h"

extern struct timezone sys_tz;
@@ -510,6 +511,7 @@ affs_remount(struct super_block *sb, int *flags, char *data)
kfree(new_opts);
return -EINVAL;
}
+ lock_kernel();
replace_mount_options(sb, new_opts);

sbi->s_flags = mount_flags;
@@ -517,8 +519,10 @@ affs_remount(struct super_block *sb, int *flags, char *data)
sbi->s_uid = uid;
sbi->s_gid = gid;

- if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
+ if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) {
+ unlock_kernel();
return 0;
+ }
if (*flags & MS_RDONLY) {
sb->s_dirt = 1;
while (sb->s_dirt)
@@ -527,6 +531,7 @@ affs_remount(struct super_block *sb, int *flags, char *data)
} else
res = affs_init_bitmap(sb, flags);

+ unlock_kernel();
return res;
}

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index d455dfe..73f1312 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -566,17 +566,22 @@ static int btrfs_remount(struct super_block *sb, int *flags, char *data)
if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
return 0;

+ lock_kernel();
if (*flags & MS_RDONLY) {
sb->s_flags |= MS_RDONLY;

ret = btrfs_commit_super(root);
WARN_ON(ret);
} else {
- if (root->fs_info->fs_devices->rw_devices == 0)
+ if (root->fs_info->fs_devices->rw_devices == 0) {
+ unlock_kernel();
return -EACCES;
+ }

- if (btrfs_super_log_root(&root->fs_info->super_copy) != 0)
+ if (btrfs_super_log_root(&root->fs_info->super_copy) != 0) {
+ unlock_kernel();
return -EINVAL;
+ }

ret = btrfs_cleanup_reloc_trees(root);
WARN_ON(ret);
@@ -587,6 +592,7 @@ static int btrfs_remount(struct super_block *sb, int *flags, char *data)
sb->s_flags &= ~MS_RDONLY;
}

+ unlock_kernel();
return 0;
}

diff --git a/fs/ext2/super.c b/fs/ext2/super.c
index f5b7fad..8b58ae9 100644
--- a/fs/ext2/super.c
+++ b/fs/ext2/super.c
@@ -1161,6 +1161,8 @@ static int ext2_remount (struct super_block * sb, int * flags, char * data)
unsigned long old_sb_flags;
int err;

+ lock_kernel();
+
/* Store the old options */
old_sb_flags = sb->s_flags;
old_opts.s_mount_opt = sbi->s_mount_opt;
@@ -1196,12 +1198,16 @@ static int ext2_remount (struct super_block * sb, int * flags, char * data)
sbi->s_mount_opt &= ~EXT2_MOUNT_XIP;
sbi->s_mount_opt |= old_mount_opt & EXT2_MOUNT_XIP;
}
- if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
+ if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) {
+ unlock_kernel();
return 0;
+ }
if (*flags & MS_RDONLY) {
if (le16_to_cpu(es->s_state) & EXT2_VALID_FS ||
- !(sbi->s_mount_state & EXT2_VALID_FS))
+ !(sbi->s_mount_state & EXT2_VALID_FS)) {
+ unlock_kernel();
return 0;
+ }
/*
* OK, we are remounting a valid rw partition rdonly, so set
* the rdonly flag and then mark the partition as valid again.
@@ -1228,12 +1234,14 @@ static int ext2_remount (struct super_block * sb, int * flags, char * data)
sb->s_flags &= ~MS_RDONLY;
}
ext2_sync_super(sb, es);
+ unlock_kernel();
return 0;
restore_opts:
sbi->s_mount_opt = old_opts.s_mount_opt;
sbi->s_resuid = old_opts.s_resuid;
sbi->s_resgid = old_opts.s_resgid;
sb->s_flags = old_sb_flags;
+ unlock_kernel();
return err;
}

diff --git a/fs/ext3/super.c b/fs/ext3/super.c
index 0ca949d..75cccbf 100644
--- a/fs/ext3/super.c
+++ b/fs/ext3/super.c
@@ -2489,6 +2489,8 @@ static int ext3_remount (struct super_block * sb, int * flags, char * data)
int i;
#endif

+ lock_kernel();
+
/* Store the original options */
lock_super(sb);
old_sb_flags = sb->s_flags;
@@ -2599,6 +2601,7 @@ static int ext3_remount (struct super_block * sb, int * flags, char * data)
kfree(old_opts.s_qf_names[i]);
#endif
unlock_super(sb);
+ unlock_kernel();
return 0;
restore_opts:
sb->s_flags = old_sb_flags;
@@ -2616,6 +2619,7 @@ restore_opts:
}
#endif
unlock_super(sb);
+ unlock_kernel();
return err;
}

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index b0bff67..78b7e88 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -3373,6 +3373,8 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
int i;
#endif

+ lock_kernel();
+
/* Store the original options */
lock_super(sb);
old_sb_flags = sb->s_flags;
@@ -3518,6 +3520,7 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
kfree(old_opts.s_qf_names[i]);
#endif
unlock_super(sb);
+ unlock_kernel();
return 0;
restore_opts:
sb->s_flags = old_sb_flags;
@@ -3537,6 +3540,7 @@ restore_opts:
}
#endif
unlock_super(sb);
+ unlock_kernel();
return err;
}

diff --git a/fs/hpfs/super.c b/fs/hpfs/super.c
index f68193c..f2feaa0 100644
--- a/fs/hpfs/super.c
+++ b/fs/hpfs/super.c
@@ -13,6 +13,7 @@
#include <linux/statfs.h>
#include <linux/magic.h>
#include <linux/sched.h>
+#include <linux/smp_lock.h>

/* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */

@@ -398,6 +399,7 @@ static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)

*flags |= MS_NOATIME;

+ lock_kernel();
lock_super(s);
uid = sbi->sb_uid; gid = sbi->sb_gid;
umask = 0777 & ~sbi->sb_mode;
@@ -432,10 +434,12 @@ static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
replace_mount_options(s, new_opts);

unlock_super(s);
+ unlock_kernel();
return 0;

out_err:
unlock_super(s);
+ unlock_kernel();
kfree(new_opts);
return -EINVAL;
}
diff --git a/fs/jffs2/fs.c b/fs/jffs2/fs.c
index 249305d..1edbe6a 100644
--- a/fs/jffs2/fs.c
+++ b/fs/jffs2/fs.c
@@ -20,6 +20,7 @@
#include <linux/vmalloc.h>
#include <linux/vfs.h>
#include <linux/crc32.h>
+#include <linux/smp_lock.h>
#include "nodelist.h"

static int jffs2_flash_setup(struct jffs2_sb_info *c);
@@ -387,6 +388,7 @@ int jffs2_remount_fs (struct super_block *sb, int *flags, char *data)
This also catches the case where it was stopped and this
is just a remount to restart it.
Flush the writebuffer, if neccecary, else we loose it */
+ lock_kernel();
if (!(sb->s_flags & MS_RDONLY)) {
jffs2_stop_garbage_collect_thread(c);
mutex_lock(&c->alloc_sem);
@@ -399,6 +401,7 @@ int jffs2_remount_fs (struct super_block *sb, int *flags, char *data)

*flags |= MS_NOATIME;

+ unlock_kernel();
return 0;
}

diff --git a/fs/jfs/super.c b/fs/jfs/super.c
index 15d0456..280ba12 100644
--- a/fs/jfs/super.c
+++ b/fs/jfs/super.c
@@ -32,6 +32,7 @@
#include <linux/crc32.h>
#include <asm/uaccess.h>
#include <linux/seq_file.h>
+#include <linux/smp_lock.h>

#include "jfs_incore.h"
#include "jfs_filsys.h"
@@ -375,19 +376,24 @@ static int jfs_remount(struct super_block *sb, int *flags, char *data)
s64 newLVSize = 0;
int rc = 0;
int flag = JFS_SBI(sb)->flag;
+ int ret;

if (!parse_options(data, sb, &newLVSize, &flag)) {
return -EINVAL;
}
+ lock_kernel();
if (newLVSize) {
if (sb->s_flags & MS_RDONLY) {
printk(KERN_ERR
"JFS: resize requires volume to be mounted read-write\n");
+ unlock_kernel();
return -EROFS;
}
rc = jfs_extendfs(sb, newLVSize, 0);
- if (rc)
+ if (rc) {
+ unlock_kernel();
return rc;
+ }
}

if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
@@ -398,23 +404,31 @@ static int jfs_remount(struct super_block *sb, int *flags, char *data)
truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);

JFS_SBI(sb)->flag = flag;
- return jfs_mount_rw(sb, 1);
+ ret = jfs_mount_rw(sb, 1);
+ unlock_kernel();
+ return ret;
}
if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
rc = jfs_umount_rw(sb);
JFS_SBI(sb)->flag = flag;
+ unlock_kernel();
return rc;
}
if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
if (!(sb->s_flags & MS_RDONLY)) {
rc = jfs_umount_rw(sb);
- if (rc)
+ if (rc) {
+ unlock_kernel();
return rc;
+ }
JFS_SBI(sb)->flag = flag;
- return jfs_mount_rw(sb, 1);
+ ret = jfs_mount_rw(sb, 1);
+ unlock_kernel();
+ return ret;
}
JFS_SBI(sb)->flag = flag;

+ unlock_kernel();
return 0;
}

diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index d2d6778..26127b6 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -1813,6 +1813,7 @@ nfs_remount(struct super_block *sb, int *flags, char *raw_data)
if (data == NULL)
return -ENOMEM;

+ lock_kernel();
/* fill out struct with values from existing mount */
data->flags = nfss->flags;
data->rsize = nfss->rsize;
@@ -1837,6 +1838,7 @@ nfs_remount(struct super_block *sb, int *flags, char *raw_data)
error = nfs_compare_remount_data(nfss, data);
out:
kfree(data);
+ unlock_kernel();
return error;
}

diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c
index 7262e84..11151ea 100644
--- a/fs/nilfs2/super.c
+++ b/fs/nilfs2/super.c
@@ -906,6 +906,8 @@ static int nilfs_remount(struct super_block *sb, int *flags, char *data)
struct nilfs_mount_options old_opts;
int err;

+ lock_kernel();
+
old_sb_flags = sb->s_flags;
old_opts.mount_opt = sbi->s_mount_opt;
old_opts.snapshot_cno = sbi->s_snapshot_cno;
@@ -985,6 +987,7 @@ static int nilfs_remount(struct super_block *sb, int *flags, char *data)
up(&sb->s_bdev->bd_mount_sem);
}
out:
+ unlock_kernel();
return 0;

rw_remount_failed:
@@ -993,6 +996,7 @@ static int nilfs_remount(struct super_block *sb, int *flags, char *data)
sb->s_flags = old_sb_flags;
sbi->s_mount_opt = old_opts.mount_opt;
sbi->s_snapshot_cno = old_opts.snapshot_cno;
+ unlock_kernel();
return err;
}

diff --git a/fs/ntfs/super.c b/fs/ntfs/super.c
index 8013eb3..10f6263 100644
--- a/fs/ntfs/super.c
+++ b/fs/ntfs/super.c
@@ -443,6 +443,8 @@ static int ntfs_remount(struct super_block *sb, int *flags, char *opt)
ntfs_volume *vol = NTFS_SB(sb);

ntfs_debug("Entering with remount options string: %s", opt);
+
+ lock_kernel();
#ifndef NTFS_RW
/* For read-only compiled driver, enforce read-only flag. */
*flags |= MS_RDONLY;
@@ -466,15 +468,18 @@ static int ntfs_remount(struct super_block *sb, int *flags, char *opt)
if (NVolErrors(vol)) {
ntfs_error(sb, "Volume has errors and is read-only%s",
es);
+ unlock_kernel();
return -EROFS;
}
if (vol->vol_flags & VOLUME_IS_DIRTY) {
ntfs_error(sb, "Volume is dirty and read-only%s", es);
+ unlock_kernel();
return -EROFS;
}
if (vol->vol_flags & VOLUME_MODIFIED_BY_CHKDSK) {
ntfs_error(sb, "Volume has been modified by chkdsk "
"and is read-only%s", es);
+ unlock_kernel();
return -EROFS;
}
if (vol->vol_flags & VOLUME_MUST_MOUNT_RO_MASK) {
@@ -482,11 +487,13 @@ static int ntfs_remount(struct super_block *sb, int *flags, char *opt)
"(0x%x) and is read-only%s",
(unsigned)le16_to_cpu(vol->vol_flags),
es);
+ unlock_kernel();
return -EROFS;
}
if (ntfs_set_volume_flags(vol, VOLUME_IS_DIRTY)) {
ntfs_error(sb, "Failed to set dirty bit in volume "
"information flags%s", es);
+ unlock_kernel();
return -EROFS;
}
#if 0
@@ -506,18 +513,21 @@ static int ntfs_remount(struct super_block *sb, int *flags, char *opt)
ntfs_error(sb, "Failed to empty journal $LogFile%s",
es);
NVolSetErrors(vol);
+ unlock_kernel();
return -EROFS;
}
if (!ntfs_mark_quotas_out_of_date(vol)) {
ntfs_error(sb, "Failed to mark quotas out of date%s",
es);
NVolSetErrors(vol);
+ unlock_kernel();
return -EROFS;
}
if (!ntfs_stamp_usnjrnl(vol)) {
ntfs_error(sb, "Failed to stamp transation log "
"($UsnJrnl)%s", es);
NVolSetErrors(vol);
+ unlock_kernel();
return -EROFS;
}
} else if (!(sb->s_flags & MS_RDONLY) && (*flags & MS_RDONLY)) {
@@ -533,8 +543,11 @@ static int ntfs_remount(struct super_block *sb, int *flags, char *opt)

// TODO: Deal with *flags.

- if (!parse_options(vol, opt))
+ if (!parse_options(vol, opt)) {
+ unlock_kernel();
return -EINVAL;
+ }
+ unlock_kernel();
ntfs_debug("Done.");
return 0;
}
diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index 4a79de1..d5172ba 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -42,6 +42,7 @@
#include <linux/mount.h>
#include <linux/seq_file.h>
#include <linux/quotaops.h>
+#include <linux/smp_lock.h>

#define MLOG_MASK_PREFIX ML_SUPER
#include <cluster/masklog.h>
@@ -581,6 +582,8 @@ static int ocfs2_remount(struct super_block *sb, int *flags, char *data)
struct mount_options parsed_options;
struct ocfs2_super *osb = OCFS2_SB(sb);

+ lock_kernel();
+
if (!ocfs2_parse_options(sb, data, &parsed_options, 1)) {
ret = -EINVAL;
goto out;
@@ -684,6 +687,7 @@ unlock_osb:
ocfs2_set_journal_params(osb);
}
out:
+ unlock_kernel();
return ret;
}

diff --git a/fs/reiserfs/super.c b/fs/reiserfs/super.c
index 83a2571..8accbc0 100644
--- a/fs/reiserfs/super.c
+++ b/fs/reiserfs/super.c
@@ -28,6 +28,7 @@
#include <linux/mount.h>
#include <linux/namei.h>
#include <linux/crc32.h>
+#include <linux/smp_lock.h>

struct file_system_type reiserfs_fs_type;

@@ -1197,6 +1198,7 @@ static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
#endif

+ lock_kernel();
rs = SB_DISK_SUPER_BLOCK(s);

if (!reiserfs_parse_options
@@ -1319,10 +1321,12 @@ static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)

out_ok:
replace_mount_options(s, new_opts);
+ unlock_kernel();
return 0;

out_err:
kfree(new_opts);
+ unlock_kernel();
return err;
}

diff --git a/fs/super.c b/fs/super.c
index e4a0c5b..4c9038b 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -542,7 +542,6 @@ int do_remount_sb(struct super_block *sb, int flags, void *data, int force)
shrink_dcache_sb(sb);
sync_filesystem(sb);

- lock_kernel();
/* If we are remounting RDONLY and current sb is read/write,
make sure there are no rw files opened */
if ((flags & MS_RDONLY) && !(sb->s_flags & MS_RDONLY)) {
@@ -562,7 +561,6 @@ int do_remount_sb(struct super_block *sb, int flags, void *data, int force)
return retval;
}
sb->s_flags = (sb->s_flags & ~MS_RMT_MASK) | (flags & MS_RMT_MASK);
- unlock_kernel();
if (remount_rw)
vfs_dq_quota_on_remount(sb);
return 0;
diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index 522c3fd..3589eab 100644
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -36,6 +36,7 @@
#include <linux/mount.h>
#include <linux/math64.h>
#include <linux/writeback.h>
+#include <linux/smp_lock.h>
#include "ubifs.h"

/*
@@ -1770,17 +1771,22 @@ static int ubifs_remount_fs(struct super_block *sb, int *flags, char *data)
return err;
}

+ lock_kernel();
if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
if (c->ro_media) {
ubifs_msg("cannot re-mount due to prior errors");
+ unlock_kernel();
return -EROFS;
}
err = ubifs_remount_rw(c);
- if (err)
+ if (err) {
+ unlock_kernel();
return err;
+ }
} else if (!(sb->s_flags & MS_RDONLY) && (*flags & MS_RDONLY)) {
if (c->ro_media) {
ubifs_msg("cannot re-mount due to prior errors");
+ unlock_kernel();
return -EROFS;
}
ubifs_remount_ro(c);
@@ -1795,6 +1801,7 @@ static int ubifs_remount_fs(struct super_block *sb, int *flags, char *data)
}

ubifs_assert(c->lst.taken_empty_lebs > 0);
+ unlock_kernel();
return 0;
}

diff --git a/fs/udf/super.c b/fs/udf/super.c
index e2e06b0..cf62c6e 100644
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -568,6 +568,7 @@ static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
if (!udf_parse_options(options, &uopt, true))
return -EINVAL;

+ lock_kernel();
sbi->s_flags = uopt.flags;
sbi->s_uid = uopt.uid;
sbi->s_gid = uopt.gid;
@@ -581,13 +582,16 @@ static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
*flags |= MS_RDONLY;
}

- if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
+ if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) {
+ unlock_kernel();
return 0;
+ }
if (*flags & MS_RDONLY)
udf_close_lvid(sb);
else
udf_open_lvid(sb);

+ unlock_kernel();
return 0;
}

diff --git a/fs/ufs/super.c b/fs/ufs/super.c
index a5ecabf..0d87a0f 100644
--- a/fs/ufs/super.c
+++ b/fs/ufs/super.c
@@ -263,6 +263,7 @@ void ufs_panic (struct super_block * sb, const char * function,
struct ufs_super_block_first * usb1;
va_list args;

+ lock_kernel();
uspi = UFS_SB(sb)->s_uspi;
usb1 = ubh_get_usb_first(uspi);

@@ -1180,7 +1181,8 @@ static int ufs_remount (struct super_block *sb, int *mount_flags, char *data)
struct ufs_super_block_third * usb3;
unsigned new_mount_opt, ufstype;
unsigned flags;
-
+
+ lock_kernel();
lock_super(sb);
uspi = UFS_SB(sb)->s_uspi;
flags = UFS_SB(sb)->s_flags;
@@ -1196,6 +1198,7 @@ static int ufs_remount (struct super_block *sb, int *mount_flags, char *data)
ufs_set_opt (new_mount_opt, ONERROR_LOCK);
if (!ufs_parse_options (data, &new_mount_opt)) {
unlock_super(sb);
+ unlock_kernel();
return -EINVAL;
}
if (!(new_mount_opt & UFS_MOUNT_UFSTYPE)) {
@@ -1203,12 +1206,14 @@ static int ufs_remount (struct super_block *sb, int *mount_flags, char *data)
} else if ((new_mount_opt & UFS_MOUNT_UFSTYPE) != ufstype) {
printk("ufstype can't be changed during remount\n");
unlock_super(sb);
+ unlock_kernel();
return -EINVAL;
}

if ((*mount_flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) {
UFS_SB(sb)->s_mount_opt = new_mount_opt;
unlock_super(sb);
+ unlock_kernel();
return 0;
}

@@ -1234,6 +1239,7 @@ static int ufs_remount (struct super_block *sb, int *mount_flags, char *data)
printk("ufs was compiled with read-only support, "
"can't be mounted as read-write\n");
unlock_super(sb);
+ unlock_kernel();
return -EINVAL;
#else
if (ufstype != UFS_MOUNT_UFSTYPE_SUN &&
@@ -1243,11 +1249,13 @@ static int ufs_remount (struct super_block *sb, int *mount_flags, char *data)
ufstype != UFS_MOUNT_UFSTYPE_UFS2) {
printk("this ufstype is read-only supported\n");
unlock_super(sb);
+ unlock_kernel();
return -EINVAL;
}
if (!ufs_read_cylinder_structures(sb)) {
printk("failed during remounting\n");
unlock_super(sb);
+ unlock_kernel();
return -EPERM;
}
sb->s_flags &= ~MS_RDONLY;
@@ -1255,6 +1263,7 @@ static int ufs_remount (struct super_block *sb, int *mount_flags, char *data)
}
UFS_SB(sb)->s_mount_opt = new_mount_opt;
unlock_super(sb);
+ unlock_kernel();
return 0;
}

diff --git a/fs/xfs/linux-2.6/xfs_super.c b/fs/xfs/linux-2.6/xfs_super.c
index d29218e..b08bc7a 100644
--- a/fs/xfs/linux-2.6/xfs_super.c
+++ b/fs/xfs/linux-2.6/xfs_super.c
@@ -67,6 +67,7 @@
#include <linux/kthread.h>
#include <linux/freezer.h>
#include <linux/parser.h>
+#include <linux/smp_lock.h>

static struct super_operations xfs_super_operations;
static kmem_zone_t *xfs_ioend_zone;
@@ -1215,6 +1216,7 @@ xfs_fs_remount(
char *p;
int error;

+ lock_kernel();
while ((p = strsep(&options, ",")) != NULL) {
int token;

@@ -1279,6 +1281,7 @@ xfs_fs_remount(
if (error) {
cmn_err(CE_WARN,
"XFS: failed to write sb changes");
+ unlock_kernel();
return error;
}
mp->m_update_flags = 0;
@@ -1292,6 +1295,7 @@ xfs_fs_remount(
mp->m_flags |= XFS_MOUNT_RDONLY;
}

+ unlock_kernel();
return 0;
}

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index a7267bf..3fb789f 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -46,6 +46,7 @@
#include <linux/cgroupstats.h>
#include <linux/hash.h>
#include <linux/namei.h>
+#include <linux/smp_lock.h>

#include <asm/atomic.h>

@@ -900,6 +901,7 @@ static int cgroup_remount(struct super_block *sb, int *flags, char *data)
struct cgroup *cgrp = &root->top_cgroup;
struct cgroup_sb_opts opts;

+ lock_kernel();
mutex_lock(&cgrp->dentry->d_inode->i_mutex);
mutex_lock(&cgroup_mutex);

@@ -927,6 +929,7 @@ static int cgroup_remount(struct super_block *sb, int *flags, char *data)
kfree(opts.release_agent);
mutex_unlock(&cgroup_mutex);
mutex_unlock(&cgrp->dentry->d_inode->i_mutex);
+ unlock_kernel();
return ret;
}

diff --git a/mm/shmem.c b/mm/shmem.c
index b25f95c..6daaa54 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -30,6 +30,7 @@
#include <linux/module.h>
#include <linux/swap.h>
#include <linux/ima.h>
+#include <linux/smp_lock.h>

static struct vfsmount *shm_mnt;

@@ -2240,6 +2241,7 @@ static int shmem_remount_fs(struct super_block *sb, int *flags, char *data)
if (shmem_parse_options(data, &config, true))
return error;

+ lock_kernel();
spin_lock(&sbinfo->stat_lock);
blocks = sbinfo->max_blocks - sbinfo->free_blocks;
inodes = sbinfo->max_inodes - sbinfo->free_inodes;
@@ -2268,6 +2270,7 @@ static int shmem_remount_fs(struct super_block *sb, int *flags, char *data)
sbinfo->mpol = config.mpol; /* transfers initial ref */
out:
spin_unlock(&sbinfo->stat_lock);
+ unlock_kernel();
return error;
}

--
1.6.0.4

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