Hello,
Mimi and I working on IMA/EVM (security/integrity) and it uses
i_version for checking if file content has been changed.
extX file systems support i_version updates with mounting file system
with "iversion" option or via kernel command line parameter
"i_version"
It seems iversion option is not recognized when mounting btrfs.
I see this patchset deals with i_version update as well..
Can you please give an advice how to use i_version with btrfs?
Thanks,
Dmitry
On Mon, Mar 26, 2012 at 5:10 PM, Josef Bacik <josef@xxxxxxxxxx> wrote:
> Btrfs had been doing it's own file_update_time so we could catch ENOSPC
> properly, so just update our btrfs_update_time to work with the new stuff and
> then we'll be fancy later. Thanks,
>
> Signed-off-by: Josef Bacik <josef@xxxxxxxxxx>
> ---
> fs/btrfs/ctree.h | 1 -
> fs/btrfs/file.c | 2 +-
> fs/btrfs/inode.c | 53 ++++++++++++++---------------------------------------
> 3 files changed, 15 insertions(+), 41 deletions(-)
>
> diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
> index 9d6f59c..9e4a06e 100644
> --- a/fs/btrfs/ctree.h
> +++ b/fs/btrfs/ctree.h
> @@ -2887,7 +2887,6 @@ int btrfs_readpage(struct file *file, struct page *page);
> void btrfs_evict_inode(struct inode *inode);
> int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc);
> int btrfs_dirty_inode(struct inode *inode);
> -int btrfs_update_time(struct file *file);
> struct inode *btrfs_alloc_inode(struct super_block *sb);
> void btrfs_destroy_inode(struct inode *inode);
> int btrfs_drop_inode(struct inode *inode);
> diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
> index 859ba2d..50b8cea 100644
> --- a/fs/btrfs/file.c
> +++ b/fs/btrfs/file.c
> @@ -1389,7 +1389,7 @@ static ssize_t btrfs_file_aio_write(struct kiocb *iocb,
> goto out;
> }
>
> - err = btrfs_update_time(file);
> + err = file_update_time(file);
> if (err) {
> mutex_unlock(&inode->i_mutex);
> goto out;
> diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
> index c2c44d6..2c7359b 100644
> --- a/fs/btrfs/inode.c
> +++ b/fs/btrfs/inode.c
> @@ -4287,46 +4287,18 @@ int btrfs_dirty_inode(struct inode *inode)
> * This is a copy of file_update_time. We need this so we can return error on
> * ENOSPC for updating the inode in the case of file write and mmap writes.
> */
> -int btrfs_update_time(struct file *file)
> +static int btrfs_update_time(struct inode *inode, struct timespec *now,
> + int flags)
> {
> - struct inode *inode = file->f_path.dentry->d_inode;
> - struct timespec now;
> - int ret;
> - enum { S_MTIME = 1, S_CTIME = 2, S_VERSION = 4 } sync_it = 0;
> -
> - /* First try to exhaust all avenues to not sync */
> - if (IS_NOCMTIME(inode))
> - return 0;
> -
> - now = current_fs_time(inode->i_sb);
> - if (!timespec_equal(&inode->i_mtime, &now))
> - sync_it = S_MTIME;
> -
> - if (!timespec_equal(&inode->i_ctime, &now))
> - sync_it |= S_CTIME;
> -
> - if (IS_I_VERSION(inode))
> - sync_it |= S_VERSION;
> -
> - if (!sync_it)
> - return 0;
> -
> - /* Finally allowed to write? Takes lock. */
> - if (mnt_want_write_file(file))
> - return 0;
> -
> - /* Only change inode inside the lock region */
> - if (sync_it & S_VERSION)
> + if (flags & S_VERSION)
> inode_inc_iversion(inode);
> - if (sync_it & S_CTIME)
> - inode->i_ctime = now;
> - if (sync_it & S_MTIME)
> - inode->i_mtime = now;
> - ret = btrfs_dirty_inode(inode);
> - if (!ret)
> - mark_inode_dirty_sync(inode);
> - mnt_drop_write(file->f_path.mnt);
> - return ret;
> + if (flags & S_CTIME)
> + inode->i_ctime = *now;
> + if (flags & S_MTIME)
> + inode->i_mtime = *now;
> + if (flags & S_ATIME)
> + inode->i_atime = *now;
> + return btrfs_dirty_inode(inode);
> }
>
> /*
> @@ -6405,7 +6377,7 @@ int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
>
> ret = btrfs_delalloc_reserve_space(inode, PAGE_CACHE_SIZE);
> if (!ret)
> - ret = btrfs_update_time(vma->vm_file);
> + ret = file_update_time(vma->vm_file);
> if (ret) {
> if (ret == -ENOMEM)
> ret = VM_FAULT_OOM;
> @@ -7451,6 +7423,7 @@ static const struct inode_operations btrfs_file_inode_operations = {
> .permission = btrfs_permission,
> .fiemap = btrfs_fiemap,
> .get_acl = btrfs_get_acl,
> + .update_time = btrfs_update_time,
> };
> static const struct inode_operations btrfs_special_inode_operations = {
> .getattr = btrfs_getattr,
> @@ -7461,6 +7434,7 @@ static const struct inode_operations btrfs_special_inode_operations = {
> .listxattr = btrfs_listxattr,
> .removexattr = btrfs_removexattr,
> .get_acl = btrfs_get_acl,
> + .update_time = btrfs_update_time,
> };
> static const struct inode_operations btrfs_symlink_inode_operations = {
> .readlink = generic_readlink,
> @@ -7474,6 +7448,7 @@ static const struct inode_operations btrfs_symlink_inode_operations = {
> .listxattr = btrfs_listxattr,
> .removexattr = btrfs_removexattr,
> .get_acl = btrfs_get_acl,
> + .update_time = btrfs_update_time,
> };
>
> const struct dentry_operations btrfs_dentry_operations = {
> --
> 1.7.5.2
>
> --
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