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Date: Thu, 01 Nov 2007 16:08:47 -0700
From: Dave Hansen <haveblue@...ibm.com>
To: akpm@...l.org
Cc: linux-kernel@...r.kernel.org, miklos@...redi.hu, hch@...radead.org,
Dave Hansen <haveblue@...ibm.com>
Subject: [PATCH 16/27] r-o-bind-mounts-elevate-write-count-for-some-ioctls
Some ioctl()s can cause writes to the filesystem. Take these, and make them
use mnt_want/drop_write() instead.
We need to pass the filp one layer deeper in XFS, but somebody _just_ pulled
it out in February because nobody was using it, so I don't feel guilty for
adding it back.
Signed-off-by: Dave Hansen <haveblue@...ibm.com>
Acked-by: Christoph Hellwig <hch@...radead.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---
linux-2.6.git-dave/fs/ext2/ioctl.c | 46 ++++++----
linux-2.6.git-dave/fs/ext3/ioctl.c | 100 +++++++++++++++-------
linux-2.6.git-dave/fs/ext4/ioctl.c | 105 +++++++++++++++---------
linux-2.6.git-dave/fs/fat/file.c | 10 +-
linux-2.6.git-dave/fs/hfsplus/ioctl.c | 40 +++++----
linux-2.6.git-dave/fs/jfs/ioctl.c | 33 ++++---
linux-2.6.git-dave/fs/ocfs2/ioctl.c | 11 +-
linux-2.6.git-dave/fs/reiserfs/ioctl.c | 55 ++++++++----
linux-2.6.git-dave/fs/xfs/linux-2.6/xfs_ioctl.c | 15 ++-
linux-2.6.git-dave/fs/xfs/linux-2.6/xfs_iops.c | 7 -
linux-2.6.git-dave/fs/xfs/linux-2.6/xfs_lrw.c | 9 +-
11 files changed, 274 insertions(+), 157 deletions(-)
diff -puN fs/ext2/ioctl.c~r-o-bind-mounts-elevate-write-count-for-some-ioctls fs/ext2/ioctl.c
--- linux-2.6.git/fs/ext2/ioctl.c~r-o-bind-mounts-elevate-write-count-for-some-ioctls 2007-11-01 14:46:14.000000000 -0700
+++ linux-2.6.git-dave/fs/ext2/ioctl.c 2007-11-01 14:46:14.000000000 -0700
@@ -12,6 +12,7 @@
#include <linux/time.h>
#include <linux/sched.h>
#include <linux/compat.h>
+#include <linux/mount.h>
#include <linux/smp_lock.h>
#include <asm/current.h>
#include <asm/uaccess.h>
@@ -20,6 +21,7 @@
int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
unsigned long arg)
{
+ int ret;
struct ext2_inode_info *ei = EXT2_I(inode);
unsigned int flags;
unsigned short rsv_window_size;
@@ -34,14 +36,19 @@ int ext2_ioctl (struct inode * inode, st
case EXT2_IOC_SETFLAGS: {
unsigned int oldflags;
- if (IS_RDONLY(inode))
- return -EROFS;
-
- if (!is_owner_or_cap(inode))
- return -EACCES;
+ ret = mnt_want_write(filp->f_vfsmnt);
+ if (ret)
+ return ret;
+
+ if (!is_owner_or_cap(inode)) {
+ ret = -EACCES;
+ goto setflags_out;
+ }
- if (get_user(flags, (int __user *) arg))
- return -EFAULT;
+ if (get_user(flags, (int __user *) arg)) {
+ ret = -EFAULT;
+ goto setflags_out;
+ }
if (!S_ISDIR(inode->i_mode))
flags &= ~EXT2_DIRSYNC_FL;
@@ -58,7 +65,8 @@ int ext2_ioctl (struct inode * inode, st
if ((flags ^ oldflags) & (EXT2_APPEND_FL | EXT2_IMMUTABLE_FL)) {
if (!capable(CAP_LINUX_IMMUTABLE)) {
mutex_unlock(&inode->i_mutex);
- return -EPERM;
+ ret = -EPERM;
+ goto setflags_out;
}
}
@@ -70,20 +78,26 @@ int ext2_ioctl (struct inode * inode, st
ext2_set_inode_flags(inode);
inode->i_ctime = CURRENT_TIME_SEC;
mark_inode_dirty(inode);
- return 0;
+setflags_out:
+ mnt_drop_write(filp->f_vfsmnt);
+ return ret;
}
case EXT2_IOC_GETVERSION:
return put_user(inode->i_generation, (int __user *) arg);
case EXT2_IOC_SETVERSION:
if (!is_owner_or_cap(inode))
return -EPERM;
- if (IS_RDONLY(inode))
- return -EROFS;
- if (get_user(inode->i_generation, (int __user *) arg))
- return -EFAULT;
- inode->i_ctime = CURRENT_TIME_SEC;
- mark_inode_dirty(inode);
- return 0;
+ ret = mnt_want_write(filp->f_vfsmnt);
+ if (ret)
+ return ret;
+ if (get_user(inode->i_generation, (int __user *) arg)) {
+ ret = -EFAULT;
+ } else {
+ inode->i_ctime = CURRENT_TIME_SEC;
+ mark_inode_dirty(inode);
+ }
+ mnt_drop_write(filp->f_vfsmnt);
+ return ret;
case EXT2_IOC_GETRSVSZ:
if (test_opt(inode->i_sb, RESERVATION)
&& S_ISREG(inode->i_mode)
diff -puN fs/ext3/ioctl.c~r-o-bind-mounts-elevate-write-count-for-some-ioctls fs/ext3/ioctl.c
--- linux-2.6.git/fs/ext3/ioctl.c~r-o-bind-mounts-elevate-write-count-for-some-ioctls 2007-11-01 14:46:14.000000000 -0700
+++ linux-2.6.git-dave/fs/ext3/ioctl.c 2007-11-01 14:46:14.000000000 -0700
@@ -12,6 +12,7 @@
#include <linux/capability.h>
#include <linux/ext3_fs.h>
#include <linux/ext3_jbd.h>
+#include <linux/mount.h>
#include <linux/time.h>
#include <linux/compat.h>
#include <linux/smp_lock.h>
@@ -38,14 +39,19 @@ int ext3_ioctl (struct inode * inode, st
unsigned int oldflags;
unsigned int jflag;
- if (IS_RDONLY(inode))
- return -EROFS;
+ err = mnt_want_write(filp->f_vfsmnt);
+ if (err)
+ return err;
- if (!is_owner_or_cap(inode))
- return -EACCES;
+ if (!is_owner_or_cap(inode)) {
+ err = -EACCES;
+ goto flags_out;
+ }
- if (get_user(flags, (int __user *) arg))
- return -EFAULT;
+ if (get_user(flags, (int __user *) arg)) {
+ err = -EFAULT;
+ goto flags_out;
+ }
if (!S_ISDIR(inode->i_mode))
flags &= ~EXT3_DIRSYNC_FL;
@@ -65,7 +71,8 @@ int ext3_ioctl (struct inode * inode, st
if ((flags ^ oldflags) & (EXT3_APPEND_FL | EXT3_IMMUTABLE_FL)) {
if (!capable(CAP_LINUX_IMMUTABLE)) {
mutex_unlock(&inode->i_mutex);
- return -EPERM;
+ err = -EPERM;
+ goto flags_out;
}
}
@@ -76,7 +83,8 @@ int ext3_ioctl (struct inode * inode, st
if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL)) {
if (!capable(CAP_SYS_RESOURCE)) {
mutex_unlock(&inode->i_mutex);
- return -EPERM;
+ err = -EPERM;
+ goto flags_out;
}
}
@@ -84,7 +92,8 @@ int ext3_ioctl (struct inode * inode, st
handle = ext3_journal_start(inode, 1);
if (IS_ERR(handle)) {
mutex_unlock(&inode->i_mutex);
- return PTR_ERR(handle);
+ err = PTR_ERR(handle);
+ goto flags_out;
}
if (IS_SYNC(inode))
handle->h_sync = 1;
@@ -110,6 +119,8 @@ flags_err:
if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL))
err = ext3_change_inode_journal_flag(inode, jflag);
mutex_unlock(&inode->i_mutex);
+flags_out:
+ mnt_drop_write(filp->f_vfsmnt);
return err;
}
case EXT3_IOC_GETVERSION:
@@ -124,14 +135,18 @@ flags_err:
if (!is_owner_or_cap(inode))
return -EPERM;
- if (IS_RDONLY(inode))
- return -EROFS;
- if (get_user(generation, (int __user *) arg))
- return -EFAULT;
-
+ err = mnt_want_write(filp->f_vfsmnt);
+ if (err)
+ return err;
+ if (get_user(generation, (int __user *) arg)) {
+ err = -EFAULT;
+ goto setversion_out;
+ }
handle = ext3_journal_start(inode, 1);
- if (IS_ERR(handle))
- return PTR_ERR(handle);
+ if (IS_ERR(handle)) {
+ err = PTR_ERR(handle);
+ goto setversion_out;
+ }
err = ext3_reserve_inode_write(handle, inode, &iloc);
if (err == 0) {
inode->i_ctime = CURRENT_TIME_SEC;
@@ -139,6 +154,8 @@ flags_err:
err = ext3_mark_iloc_dirty(handle, inode, &iloc);
}
ext3_journal_stop(handle);
+setversion_out:
+ mnt_drop_write(filp->f_vfsmnt);
return err;
}
#ifdef CONFIG_JBD_DEBUG
@@ -174,18 +191,24 @@ flags_err:
}
return -ENOTTY;
case EXT3_IOC_SETRSVSZ: {
+ int err;
if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode))
return -ENOTTY;
- if (IS_RDONLY(inode))
- return -EROFS;
+ err = mnt_want_write(filp->f_vfsmnt);
+ if (err)
+ return err;
- if (!is_owner_or_cap(inode))
- return -EACCES;
+ if (!is_owner_or_cap(inode)) {
+ err = -EACCES;
+ goto setrsvsz_out;
+ }
- if (get_user(rsv_window_size, (int __user *)arg))
- return -EFAULT;
+ if (get_user(rsv_window_size, (int __user *)arg)) {
+ err = -EFAULT;
+ goto setrsvsz_out;
+ }
if (rsv_window_size > EXT3_MAX_RESERVE_BLOCKS)
rsv_window_size = EXT3_MAX_RESERVE_BLOCKS;
@@ -203,7 +226,9 @@ flags_err:
rsv->rsv_goal_size = rsv_window_size;
}
mutex_unlock(&ei->truncate_mutex);
- return 0;
+setrsvsz_out:
+ mnt_drop_write(filp->f_vfsmnt);
+ return err;
}
case EXT3_IOC_GROUP_EXTEND: {
ext3_fsblk_t n_blocks_count;
@@ -213,17 +238,20 @@ flags_err:
if (!capable(CAP_SYS_RESOURCE))
return -EPERM;
- if (IS_RDONLY(inode))
- return -EROFS;
-
- if (get_user(n_blocks_count, (__u32 __user *)arg))
- return -EFAULT;
+ err = mnt_want_write(filp->f_vfsmnt);
+ if (err)
+ return err;
+ if (get_user(n_blocks_count, (__u32 __user *)arg)) {
+ err = -EFAULT;
+ goto group_extend_out;
+ }
err = ext3_group_extend(sb, EXT3_SB(sb)->s_es, n_blocks_count);
journal_lock_updates(EXT3_SB(sb)->s_journal);
journal_flush(EXT3_SB(sb)->s_journal);
journal_unlock_updates(EXT3_SB(sb)->s_journal);
-
+group_extend_out:
+ mnt_drop_write(filp->f_vfsmnt);
return err;
}
case EXT3_IOC_GROUP_ADD: {
@@ -234,18 +262,22 @@ flags_err:
if (!capable(CAP_SYS_RESOURCE))
return -EPERM;
- if (IS_RDONLY(inode))
- return -EROFS;
+ err = mnt_want_write(filp->f_vfsmnt);
+ if (err)
+ return err;
if (copy_from_user(&input, (struct ext3_new_group_input __user *)arg,
- sizeof(input)))
- return -EFAULT;
+ sizeof(input))) {
+ err = -EFAULT;
+ goto group_add_out;
+ }
err = ext3_group_add(sb, &input);
journal_lock_updates(EXT3_SB(sb)->s_journal);
journal_flush(EXT3_SB(sb)->s_journal);
journal_unlock_updates(EXT3_SB(sb)->s_journal);
-
+group_add_out:
+ mnt_drop_write(filp->f_vfsmnt);
return err;
}
diff -puN fs/ext4/ioctl.c~r-o-bind-mounts-elevate-write-count-for-some-ioctls fs/ext4/ioctl.c
--- linux-2.6.git/fs/ext4/ioctl.c~r-o-bind-mounts-elevate-write-count-for-some-ioctls 2007-11-01 14:46:14.000000000 -0700
+++ linux-2.6.git-dave/fs/ext4/ioctl.c 2007-11-01 14:46:14.000000000 -0700
@@ -12,6 +12,7 @@
#include <linux/capability.h>
#include <linux/ext4_fs.h>
#include <linux/ext4_jbd2.h>
+#include <linux/mount.h>
#include <linux/time.h>
#include <linux/compat.h>
#include <linux/smp_lock.h>
@@ -38,15 +39,19 @@ int ext4_ioctl (struct inode * inode, st
unsigned int oldflags;
unsigned int jflag;
- if (IS_RDONLY(inode))
- return -EROFS;
-
- if (!is_owner_or_cap(inode))
- return -EACCES;
+ err = mnt_want_write(filp->f_vfsmnt);
+ if (err)
+ return err;
- if (get_user(flags, (int __user *) arg))
- return -EFAULT;
+ if (!is_owner_or_cap(inode)) {
+ err = -EACCES;
+ goto flags_out;
+ }
+ if (get_user(flags, (int __user *) arg)) {
+ err = -EFAULT;
+ goto flags_out;
+ }
if (!S_ISDIR(inode->i_mode))
flags &= ~EXT4_DIRSYNC_FL;
@@ -65,7 +70,8 @@ int ext4_ioctl (struct inode * inode, st
if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
if (!capable(CAP_LINUX_IMMUTABLE)) {
mutex_unlock(&inode->i_mutex);
- return -EPERM;
+ err = -EPERM;
+ goto flags_out;
}
}
@@ -76,7 +82,8 @@ int ext4_ioctl (struct inode * inode, st
if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
if (!capable(CAP_SYS_RESOURCE)) {
mutex_unlock(&inode->i_mutex);
- return -EPERM;
+ err = -EPERM;
+ goto flags_out;
}
}
@@ -84,7 +91,8 @@ int ext4_ioctl (struct inode * inode, st
handle = ext4_journal_start(inode, 1);
if (IS_ERR(handle)) {
mutex_unlock(&inode->i_mutex);
- return PTR_ERR(handle);
+ err = PTR_ERR(handle);
+ goto flags_out;
}
if (IS_SYNC(inode))
handle->h_sync = 1;
@@ -104,12 +112,14 @@ flags_err:
ext4_journal_stop(handle);
if (err) {
mutex_unlock(&inode->i_mutex);
- return err;
+ goto flags_out;
}
if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
err = ext4_change_inode_journal_flag(inode, jflag);
mutex_unlock(&inode->i_mutex);
+flags_out:
+ mnt_drop_write(filp->f_vfsmnt);
return err;
}
case EXT4_IOC_GETVERSION:
@@ -124,14 +134,18 @@ flags_err:
if (!is_owner_or_cap(inode))
return -EPERM;
- if (IS_RDONLY(inode))
- return -EROFS;
- if (get_user(generation, (int __user *) arg))
- return -EFAULT;
-
+ err = mnt_want_write(filp->f_vfsmnt);
+ if (err)
+ return err;
+ if (get_user(generation, (int __user *) arg)) {
+ err = -EFAULT;
+ goto setversion_out;
+ }
handle = ext4_journal_start(inode, 1);
- if (IS_ERR(handle))
- return PTR_ERR(handle);
+ if (IS_ERR(handle)) {
+ err = PTR_ERR(handle);
+ goto setversion_out;
+ }
err = ext4_reserve_inode_write(handle, inode, &iloc);
if (err == 0) {
inode->i_ctime = ext4_current_time(inode);
@@ -139,6 +153,8 @@ flags_err:
err = ext4_mark_iloc_dirty(handle, inode, &iloc);
}
ext4_journal_stop(handle);
+setversion_out:
+ mnt_drop_write(filp->f_vfsmnt);
return err;
}
#ifdef CONFIG_JBD2_DEBUG
@@ -174,19 +190,23 @@ flags_err:
}
return -ENOTTY;
case EXT4_IOC_SETRSVSZ: {
+ int err;
if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode))
return -ENOTTY;
- if (IS_RDONLY(inode))
- return -EROFS;
-
- if (!is_owner_or_cap(inode))
- return -EACCES;
-
- if (get_user(rsv_window_size, (int __user *)arg))
- return -EFAULT;
+ err = mnt_want_write(filp->f_vfsmnt);
+ if (err)
+ return err;
+ if (!is_owner_or_cap(inode)) {
+ err = -EACCES;
+ goto setrsvsz_out;
+ }
+ if (get_user(rsv_window_size, (int __user *)arg)) {
+ err = -EFAULT;
+ goto setrsvsz_out;
+ }
if (rsv_window_size > EXT4_MAX_RESERVE_BLOCKS)
rsv_window_size = EXT4_MAX_RESERVE_BLOCKS;
@@ -203,7 +223,9 @@ flags_err:
rsv->rsv_goal_size = rsv_window_size;
}
mutex_unlock(&ei->truncate_mutex);
- return 0;
+setrsvsz_out:
+ mnt_drop_write(filp->f_vfsmnt);
+ return err;
}
case EXT4_IOC_GROUP_EXTEND: {
ext4_fsblk_t n_blocks_count;
@@ -213,17 +235,21 @@ flags_err:
if (!capable(CAP_SYS_RESOURCE))
return -EPERM;
- if (IS_RDONLY(inode))
- return -EROFS;
-
- if (get_user(n_blocks_count, (__u32 __user *)arg))
- return -EFAULT;
+ err = mnt_want_write(filp->f_vfsmnt);
+ if (err)
+ return err;
+ if (get_user(n_blocks_count, (__u32 __user *)arg)) {
+ err = -EFAULT;
+ goto group_extend_out;
+ }
err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
jbd2_journal_flush(EXT4_SB(sb)->s_journal);
jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
+group_extend_out:
+ mnt_drop_write(filp->f_vfsmnt);
return err;
}
case EXT4_IOC_GROUP_ADD: {
@@ -234,18 +260,21 @@ flags_err:
if (!capable(CAP_SYS_RESOURCE))
return -EPERM;
- if (IS_RDONLY(inode))
- return -EROFS;
+ err = mnt_want_write(filp->f_vfsmnt);
+ if (err)
+ return err;
if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
- sizeof(input)))
- return -EFAULT;
-
+ sizeof(input))) {
+ err = -EFAULT;
+ goto group_add_out;
+ }
err = ext4_group_add(sb, &input);
jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
jbd2_journal_flush(EXT4_SB(sb)->s_journal);
jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
-
+group_add_out:
+ mnt_drop_write(filp->f_vfsmnt);
return err;
}
diff -puN fs/fat/file.c~r-o-bind-mounts-elevate-write-count-for-some-ioctls fs/fat/file.c
--- linux-2.6.git/fs/fat/file.c~r-o-bind-mounts-elevate-write-count-for-some-ioctls 2007-11-01 14:46:14.000000000 -0700
+++ linux-2.6.git-dave/fs/fat/file.c 2007-11-01 14:46:14.000000000 -0700
@@ -8,6 +8,7 @@
#include <linux/capability.h>
#include <linux/module.h>
+#include <linux/mount.h>
#include <linux/time.h>
#include <linux/msdos_fs.h>
#include <linux/smp_lock.h>
@@ -46,10 +47,9 @@ int fat_generic_ioctl(struct inode *inod
mutex_lock(&inode->i_mutex);
- if (IS_RDONLY(inode)) {
- err = -EROFS;
- goto up;
- }
+ err = mnt_want_write(filp->f_vfsmnt);
+ if (err)
+ goto up_no_drop_write;
/*
* ATTR_VOLUME and ATTR_DIR cannot be changed; this also
@@ -106,6 +106,8 @@ int fat_generic_ioctl(struct inode *inod
MSDOS_I(inode)->i_attrs = attr & ATTR_UNUSED;
mark_inode_dirty(inode);
up:
+ mnt_drop_write(filp->f_vfsmnt);
+ up_no_drop_write:
mutex_unlock(&inode->i_mutex);
return err;
}
diff -puN fs/hfsplus/ioctl.c~r-o-bind-mounts-elevate-write-count-for-some-ioctls fs/hfsplus/ioctl.c
--- linux-2.6.git/fs/hfsplus/ioctl.c~r-o-bind-mounts-elevate-write-count-for-some-ioctls 2007-11-01 14:46:14.000000000 -0700
+++ linux-2.6.git-dave/fs/hfsplus/ioctl.c 2007-11-01 14:46:14.000000000 -0700
@@ -14,6 +14,7 @@
#include <linux/capability.h>
#include <linux/fs.h>
+#include <linux/mount.h>
#include <linux/sched.h>
#include <linux/xattr.h>
#include <asm/uaccess.h>
@@ -35,25 +36,32 @@ int hfsplus_ioctl(struct inode *inode, s
flags |= FS_NODUMP_FL; /* EXT2_NODUMP_FL */
return put_user(flags, (int __user *)arg);
case HFSPLUS_IOC_EXT2_SETFLAGS: {
- if (IS_RDONLY(inode))
- return -EROFS;
-
- if (!is_owner_or_cap(inode))
- return -EACCES;
-
- if (get_user(flags, (int __user *)arg))
- return -EFAULT;
-
+ int err = 0;
+ err = mnt_want_write(filp->f_vfsmnt);
+ if (err)
+ return err;
+
+ if (!is_owner_or_cap(inode)) {
+ err = -EACCES;
+ goto setflags_out;
+ }
+ if (get_user(flags, (int __user *)arg)) {
+ err = -EFAULT;
+ goto setflags_out;
+ }
if (flags & (FS_IMMUTABLE_FL|FS_APPEND_FL) ||
HFSPLUS_I(inode).rootflags & (HFSPLUS_FLG_IMMUTABLE|HFSPLUS_FLG_APPEND)) {
- if (!capable(CAP_LINUX_IMMUTABLE))
- return -EPERM;
+ if (!capable(CAP_LINUX_IMMUTABLE)) {
+ err = -EPERM;
+ goto setflags_out;
+ }
}
/* don't silently ignore unsupported ext2 flags */
- if (flags & ~(FS_IMMUTABLE_FL|FS_APPEND_FL|FS_NODUMP_FL))
- return -EOPNOTSUPP;
-
+ if (flags & ~(FS_IMMUTABLE_FL|FS_APPEND_FL|FS_NODUMP_FL)) {
+ err = -EOPNOTSUPP;
+ goto setflags_out;
+ }
if (flags & FS_IMMUTABLE_FL) { /* EXT2_IMMUTABLE_FL */
inode->i_flags |= S_IMMUTABLE;
HFSPLUS_I(inode).rootflags |= HFSPLUS_FLG_IMMUTABLE;
@@ -75,7 +83,9 @@ int hfsplus_ioctl(struct inode *inode, s
inode->i_ctime = CURRENT_TIME_SEC;
mark_inode_dirty(inode);
- return 0;
+setflags_out:
+ mnt_drop_write(filp->f_vfsmnt);
+ return err;
}
default:
return -ENOTTY;
diff -puN fs/jfs/ioctl.c~r-o-bind-mounts-elevate-write-count-for-some-ioctls fs/jfs/ioctl.c
--- linux-2.6.git/fs/jfs/ioctl.c~r-o-bind-mounts-elevate-write-count-for-some-ioctls 2007-11-01 14:46:14.000000000 -0700
+++ linux-2.6.git-dave/fs/jfs/ioctl.c 2007-11-01 14:46:14.000000000 -0700
@@ -8,6 +8,7 @@
#include <linux/fs.h>
#include <linux/ctype.h>
#include <linux/capability.h>
+#include <linux/mount.h>
#include <linux/time.h>
#include <linux/sched.h>
#include <asm/current.h>
@@ -65,16 +66,20 @@ int jfs_ioctl(struct inode * inode, stru
return put_user(flags, (int __user *) arg);
case JFS_IOC_SETFLAGS: {
unsigned int oldflags;
+ int err;
- if (IS_RDONLY(inode))
- return -EROFS;
-
- if (!is_owner_or_cap(inode))
- return -EACCES;
-
- if (get_user(flags, (int __user *) arg))
- return -EFAULT;
-
+ err = mnt_want_write(filp->f_vfsmnt);
+ if (err)
+ return err;
+
+ if (!is_owner_or_cap(inode)) {
+ err = -EACCES;
+ goto setflags_out;
+ }
+ if (get_user(flags, (int __user *) arg)) {
+ err = -EFAULT;
+ goto setflags_out;
+ }
flags = jfs_map_ext2(flags, 1);
if (!S_ISDIR(inode->i_mode))
flags &= ~JFS_DIRSYNC_FL;
@@ -89,8 +94,10 @@ int jfs_ioctl(struct inode * inode, stru
if ((oldflags & JFS_IMMUTABLE_FL) ||
((flags ^ oldflags) &
(JFS_APPEND_FL | JFS_IMMUTABLE_FL))) {
- if (!capable(CAP_LINUX_IMMUTABLE))
- return -EPERM;
+ if (!capable(CAP_LINUX_IMMUTABLE)) {
+ err = -EPERM;
+ goto setflags_out;
+ }
}
flags = flags & JFS_FL_USER_MODIFIABLE;
@@ -100,7 +107,9 @@ int jfs_ioctl(struct inode * inode, stru
jfs_set_inode_flags(inode);
inode->i_ctime = CURRENT_TIME_SEC;
mark_inode_dirty(inode);
- return 0;
+setflags_out:
+ mnt_drop_write(filp->f_vfsmnt);
+ return err;
}
default:
return -ENOTTY;
diff -puN fs/ocfs2/ioctl.c~r-o-bind-mounts-elevate-write-count-for-some-ioctls fs/ocfs2/ioctl.c
--- linux-2.6.git/fs/ocfs2/ioctl.c~r-o-bind-mounts-elevate-write-count-for-some-ioctls 2007-11-01 14:46:14.000000000 -0700
+++ linux-2.6.git-dave/fs/ocfs2/ioctl.c 2007-11-01 14:46:14.000000000 -0700
@@ -58,10 +58,6 @@ static int ocfs2_set_inode_attr(struct i
goto bail;
}
- status = -EROFS;
- if (IS_RDONLY(inode))
- goto bail_unlock;
-
status = -EACCES;
if (!is_owner_or_cap(inode))
goto bail_unlock;
@@ -130,8 +126,13 @@ int ocfs2_ioctl(struct inode * inode, st
if (get_user(flags, (int __user *) arg))
return -EFAULT;
- return ocfs2_set_inode_attr(inode, flags,
+ status = mnt_want_write(filp->f_vfsmnt);
+ if (status)
+ return status;
+ status = ocfs2_set_inode_attr(inode, flags,
OCFS2_FL_MODIFIABLE);
+ mnt_drop_write(filp->f_vfsmnt);
+ return status;
case OCFS2_IOC_RESVSP:
case OCFS2_IOC_RESVSP64:
case OCFS2_IOC_UNRESVSP:
diff -puN fs/reiserfs/ioctl.c~r-o-bind-mounts-elevate-write-count-for-some-ioctls fs/reiserfs/ioctl.c
--- linux-2.6.git/fs/reiserfs/ioctl.c~r-o-bind-mounts-elevate-write-count-for-some-ioctls 2007-11-01 14:46:14.000000000 -0700
+++ linux-2.6.git-dave/fs/reiserfs/ioctl.c 2007-11-01 14:46:14.000000000 -0700
@@ -4,6 +4,7 @@
#include <linux/capability.h>
#include <linux/fs.h>
+#include <linux/mount.h>
#include <linux/reiserfs_fs.h>
#include <linux/time.h>
#include <asm/uaccess.h>
@@ -25,6 +26,7 @@ int reiserfs_ioctl(struct inode *inode,
unsigned long arg)
{
unsigned int flags;
+ int err = 0;
switch (cmd) {
case REISERFS_IOC_UNPACK:
@@ -48,47 +50,60 @@ int reiserfs_ioctl(struct inode *inode,
if (!reiserfs_attrs(inode->i_sb))
return -ENOTTY;
- if (IS_RDONLY(inode))
- return -EROFS;
-
- if (!is_owner_or_cap(inode))
- return -EPERM;
-
- if (get_user(flags, (int __user *)arg))
- return -EFAULT;
-
+ err = mnt_want_write(filp->f_vfsmnt);
+ if (err)
+ return err;
+
+ if (!is_owner_or_cap(inode)) {
+ err = -EPERM;
+ goto setflags_out;
+ }
+ if (get_user(flags, (int __user *)arg)) {
+ err = -EFAULT;
+ goto setflags_out;
+ }
if (((flags ^ REISERFS_I(inode)->
i_attrs) & (REISERFS_IMMUTABLE_FL |
REISERFS_APPEND_FL))
- && !capable(CAP_LINUX_IMMUTABLE))
- return -EPERM;
-
+ && !capable(CAP_LINUX_IMMUTABLE)) {
+ err = -EPERM;
+ goto setflags_out;
+ }
if ((flags & REISERFS_NOTAIL_FL) &&
S_ISREG(inode->i_mode)) {
int result;
result = reiserfs_unpack(inode, filp);
- if (result)
- return result;
+ if (result) {
+ err = result;
+ goto setflags_out;
+ }
}
sd_attrs_to_i_attrs(flags, inode);
REISERFS_I(inode)->i_attrs = flags;
inode->i_ctime = CURRENT_TIME_SEC;
mark_inode_dirty(inode);
- return 0;
+setflags_out:
+ mnt_drop_write(filp->f_vfsmnt);
+ return err;
}
case REISERFS_IOC_GETVERSION:
return put_user(inode->i_generation, (int __user *)arg);
case REISERFS_IOC_SETVERSION:
if (!is_owner_or_cap(inode))
return -EPERM;
- if (IS_RDONLY(inode))
- return -EROFS;
- if (get_user(inode->i_generation, (int __user *)arg))
- return -EFAULT;
+ err = mnt_want_write(filp->f_vfsmnt);
+ if (err)
+ return err;
+ if (get_user(inode->i_generation, (int __user *)arg)) {
+ err = -EFAULT;
+ goto setversion_out;
+ }
inode->i_ctime = CURRENT_TIME_SEC;
mark_inode_dirty(inode);
- return 0;
+setversion_out:
+ mnt_drop_write(filp->f_vfsmnt);
+ return err;
default:
return -ENOTTY;
}
diff -puN fs/xfs/linux-2.6/xfs_ioctl.c~r-o-bind-mounts-elevate-write-count-for-some-ioctls fs/xfs/linux-2.6/xfs_ioctl.c
--- linux-2.6.git/fs/xfs/linux-2.6/xfs_ioctl.c~r-o-bind-mounts-elevate-write-count-for-some-ioctls 2007-11-01 14:46:14.000000000 -0700
+++ linux-2.6.git-dave/fs/xfs/linux-2.6/xfs_ioctl.c 2007-11-01 14:46:14.000000000 -0700
@@ -554,8 +554,6 @@ xfs_attrmulti_attr_set(
char *kbuf;
int error = EFAULT;
- if (IS_RDONLY(inode))
- return -EROFS;
if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
return EPERM;
if (len > XATTR_SIZE_MAX)
@@ -581,8 +579,6 @@ xfs_attrmulti_attr_remove(
char *name,
__uint32_t flags)
{
- if (IS_RDONLY(inode))
- return -EROFS;
if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
return EPERM;
return xfs_attr_remove(XFS_I(inode), name, flags);
@@ -592,6 +588,7 @@ STATIC int
xfs_attrmulti_by_handle(
xfs_mount_t *mp,
void __user *arg,
+ struct file *parfilp,
struct inode *parinode)
{
int error;
@@ -646,13 +643,21 @@ xfs_attrmulti_by_handle(
&ops[i].am_length, ops[i].am_flags);
break;
case ATTR_OP_SET:
+ ops[i].am_error = mnt_want_write(parfilp->f_vfsmnt);
+ if (ops[i].am_error)
+ break;
ops[i].am_error = xfs_attrmulti_attr_set(inode,
attr_name, ops[i].am_attrvalue,
ops[i].am_length, ops[i].am_flags);
+ mnt_drop_write(parfilp->f_vfsmnt);
break;
case ATTR_OP_REMOVE:
+ ops[i].am_error = mnt_want_write(parfilp->f_vfsmnt);
+ if (ops[i].am_error)
+ break;
ops[i].am_error = xfs_attrmulti_attr_remove(inode,
attr_name, ops[i].am_flags);
+ mnt_drop_write(parfilp->f_vfsmnt);
break;
default:
ops[i].am_error = EINVAL;
@@ -834,7 +839,7 @@ xfs_ioctl(
return xfs_attrlist_by_handle(mp, arg, inode);
case XFS_IOC_ATTRMULTI_BY_HANDLE:
- return xfs_attrmulti_by_handle(mp, arg, inode);
+ return xfs_attrmulti_by_handle(mp, arg, filp, inode);
case XFS_IOC_SWAPEXT: {
error = xfs_swapext((struct xfs_swapext __user *)arg);
diff -puN fs/xfs/linux-2.6/xfs_iops.c~r-o-bind-mounts-elevate-write-count-for-some-ioctls fs/xfs/linux-2.6/xfs_iops.c
--- linux-2.6.git/fs/xfs/linux-2.6/xfs_iops.c~r-o-bind-mounts-elevate-write-count-for-some-ioctls 2007-11-01 14:46:14.000000000 -0700
+++ linux-2.6.git-dave/fs/xfs/linux-2.6/xfs_iops.c 2007-11-01 14:46:14.000000000 -0700
@@ -140,13 +140,6 @@ xfs_ichgtime_fast(
*/
ASSERT((flags & XFS_ICHGTIME_ACC) == 0);
- /*
- * We're not supposed to change timestamps in readonly-mounted
- * filesystems. Throw it away if anyone asks us.
- */
- if (unlikely(IS_RDONLY(inode)))
- return;
-
if (flags & XFS_ICHGTIME_MOD) {
tvp = &inode->i_mtime;
ip->i_d.di_mtime.t_sec = (__int32_t)tvp->tv_sec;
diff -puN fs/xfs/linux-2.6/xfs_lrw.c~r-o-bind-mounts-elevate-write-count-for-some-ioctls fs/xfs/linux-2.6/xfs_lrw.c
--- linux-2.6.git/fs/xfs/linux-2.6/xfs_lrw.c~r-o-bind-mounts-elevate-write-count-for-some-ioctls 2007-11-01 14:46:14.000000000 -0700
+++ linux-2.6.git-dave/fs/xfs/linux-2.6/xfs_lrw.c 2007-11-01 14:46:14.000000000 -0700
@@ -51,6 +51,7 @@
#include "xfs_vnodeops.h"
#include <linux/capability.h>
+#include <linux/mount.h>
#include <linux/writeback.h>
@@ -690,10 +691,16 @@ start:
if (new_size > xip->i_size)
io->io_new_size = new_size;
- if (likely(!(ioflags & IO_INVIS))) {
+ /*
+ * We're not supposed to change timestamps in readonly-mounted
+ * filesystems. Throw it away if anyone asks us.
+ */
+ if (likely(!(ioflags & IO_INVIS) &&
+ !mnt_want_write(file->f_vfsmnt))) {
file_update_time(file);
xfs_ichgtime_fast(xip, inode,
XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
+ mnt_drop_write(file->f_vfsmnt);
}
/*
_
-
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