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authorTheodore Ts'o <tytso@mit.edu>2011-09-09 18:36:51 -0400
committerTheodore Ts'o <tytso@mit.edu>2011-09-09 18:36:51 -0400
commitbab08ab9646288f1b0b72a7aaeecdff94bd62c18 (patch)
treee301377f1ce9093a44b2cfb331439e15d79789ed /fs/ext4/ioctl.c
parent281b59959707dfae03ce038cdf231bf4904e170c (diff)
ext4: enforce bigalloc restrictions (e.g., no online resizing, etc.)
At least initially if the bigalloc feature is enabled, we will not support non-extent mapped inodes, online resizing, online defrag, or the FITRIM ioctl. This simplifies the initial implementation. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/ioctl.c')
-rw-r--r--fs/ext4/ioctl.c33
1 files changed, 29 insertions, 4 deletions
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index f18bfe37aff8..2046d699b4a7 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -21,6 +21,7 @@
long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
struct inode *inode = filp->f_dentry->d_inode;
+ struct super_block *sb = inode->i_sb;
struct ext4_inode_info *ei = EXT4_I(inode);
unsigned int flags;
@@ -183,7 +184,6 @@ setversion_out:
* Returns 1 if it slept, else zero.
*/
{
- struct super_block *sb = inode->i_sb;
DECLARE_WAITQUEUE(wait, current);
int ret = 0;
@@ -199,7 +199,6 @@ setversion_out:
#endif
case EXT4_IOC_GROUP_EXTEND: {
ext4_fsblk_t n_blocks_count;
- struct super_block *sb = inode->i_sb;
int err, err2=0;
err = ext4_resize_begin(sb);
@@ -209,6 +208,13 @@ setversion_out:
if (get_user(n_blocks_count, (__u32 __user *)arg))
return -EFAULT;
+ if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
+ EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
+ ext4_msg(sb, KERN_ERR,
+ "Online resizing not supported with bigalloc");
+ return -EOPNOTSUPP;
+ }
+
err = mnt_want_write(filp->f_path.mnt);
if (err)
return err;
@@ -250,6 +256,13 @@ setversion_out:
goto mext_out;
}
+ if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
+ EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
+ ext4_msg(sb, KERN_ERR,
+ "Online defrag not supported with bigalloc");
+ return -EOPNOTSUPP;
+ }
+
err = mnt_want_write(filp->f_path.mnt);
if (err)
goto mext_out;
@@ -270,7 +283,6 @@ mext_out:
case EXT4_IOC_GROUP_ADD: {
struct ext4_new_group_data input;
- struct super_block *sb = inode->i_sb;
int err, err2=0;
err = ext4_resize_begin(sb);
@@ -281,6 +293,13 @@ mext_out:
sizeof(input)))
return -EFAULT;
+ if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
+ EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
+ ext4_msg(sb, KERN_ERR,
+ "Online resizing not supported with bigalloc");
+ return -EOPNOTSUPP;
+ }
+
err = mnt_want_write(filp->f_path.mnt);
if (err)
return err;
@@ -337,7 +356,6 @@ mext_out:
case FITRIM:
{
- struct super_block *sb = inode->i_sb;
struct request_queue *q = bdev_get_queue(sb->s_bdev);
struct fstrim_range range;
int ret = 0;
@@ -348,6 +366,13 @@ mext_out:
if (!blk_queue_discard(q))
return -EOPNOTSUPP;
+ if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
+ EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
+ ext4_msg(sb, KERN_ERR,
+ "FITRIM not supported with bigalloc");
+ return -EOPNOTSUPP;
+ }
+
if (copy_from_user(&range, (struct fstrim_range *)arg,
sizeof(range)))
return -EFAULT;