diff mbox series

ext4: fix i_version handling in ext4

Message ID 20220819113620.12048-1-jlayton@kernel.org (mailing list archive)
State New, archived
Headers show
Series ext4: fix i_version handling in ext4 | expand

Commit Message

Jeff Layton Aug. 19, 2022, 11:36 a.m. UTC
ext4 currently updates the i_version counter when the atime is updated
during a read. This is less than ideal as it can cause unnecessary cache
invalidations with NFSv4 and unnecessary remeasurements for IMA. The
increment in ext4_mark_iloc_dirty is also problematic since it can also
corrupt the i_version counter for ea_inodes. We aren't bumping the file
times in ext4_mark_iloc_dirty, so changing the i_version there seems
wrong, and is the cause of both problems.

Remove that callsite and add increments to the setattr, setxattr and
ioctl codepaths (at the same time that we update the ctime). The
i_version bump that already happens during timestamp updates should take
care of the rest.

In ext4_move_extents, increment the i_version on both inodes, and also
add in missing ctime updates.

Cc: Lukas Czerner <lczerner@redhat.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
 fs/ext4/inode.c       | 10 +++++-----
 fs/ext4/ioctl.c       |  4 ++++
 fs/ext4/move_extent.c |  6 ++++++
 fs/ext4/xattr.c       |  2 ++
 4 files changed, 17 insertions(+), 5 deletions(-)

Comments

Jeff Layton Aug. 19, 2022, 11:40 a.m. UTC | #1
Oops, I should have labeled this "PATCH v3". In any case, I think we've
covered all of the places where it should get bumped now.

On Fri, 2022-08-19 at 07:36 -0400, Jeff Layton wrote:
> ext4 currently updates the i_version counter when the atime is updated
> during a read. This is less than ideal as it can cause unnecessary cache
> invalidations with NFSv4 and unnecessary remeasurements for IMA. The
> increment in ext4_mark_iloc_dirty is also problematic since it can also
> corrupt the i_version counter for ea_inodes. We aren't bumping the file
> times in ext4_mark_iloc_dirty, so changing the i_version there seems
> wrong, and is the cause of both problems.
> 
> Remove that callsite and add increments to the setattr, setxattr and
> ioctl codepaths (at the same time that we update the ctime). The
> i_version bump that already happens during timestamp updates should take
> care of the rest.
> 
> In ext4_move_extents, increment the i_version on both inodes, and also
> add in missing ctime updates.
> 
> Cc: Lukas Czerner <lczerner@redhat.com>
> Reviewed-by: Jan Kara <jack@suse.cz>
> Reviewed-by: Christian Brauner (Microsoft) <brauner@kernel.org>
> Signed-off-by: Jeff Layton <jlayton@kernel.org>
> ---
>  fs/ext4/inode.c       | 10 +++++-----
>  fs/ext4/ioctl.c       |  4 ++++
>  fs/ext4/move_extent.c |  6 ++++++
>  fs/ext4/xattr.c       |  2 ++
>  4 files changed, 17 insertions(+), 5 deletions(-)
> 
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index 601214453c3a..aa37bce4c541 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -5342,6 +5342,7 @@ int ext4_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
>  	int error, rc = 0;
>  	int orphan = 0;
>  	const unsigned int ia_valid = attr->ia_valid;
> +	bool inc_ivers = IS_I_VERSION(inode);
>  
>  	if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
>  		return -EIO;
> @@ -5425,8 +5426,8 @@ int ext4_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
>  			return -EINVAL;
>  		}
>  
> -		if (IS_I_VERSION(inode) && attr->ia_size != inode->i_size)
> -			inode_inc_iversion(inode);
> +		if (attr->ia_size == inode->i_size)
> +			inc_ivers = false;
>  
>  		if (shrink) {
>  			if (ext4_should_order_data(inode)) {
> @@ -5528,6 +5529,8 @@ int ext4_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
>  	}
>  
>  	if (!error) {
> +		if (inc_ivers)
> +			inode_inc_iversion(inode);
>  		setattr_copy(mnt_userns, inode, attr);
>  		mark_inode_dirty(inode);
>  	}
> @@ -5731,9 +5734,6 @@ int ext4_mark_iloc_dirty(handle_t *handle,
>  	}
>  	ext4_fc_track_inode(handle, inode);
>  
> -	if (IS_I_VERSION(inode))
> -		inode_inc_iversion(inode);
> -
>  	/* the do_update_inode consumes one bh->b_count */
>  	get_bh(iloc->bh);
>  
> diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
> index 3cf3ec4b1c21..ad3a294a88eb 100644
> --- a/fs/ext4/ioctl.c
> +++ b/fs/ext4/ioctl.c
> @@ -452,6 +452,7 @@ static long swap_inode_boot_loader(struct super_block *sb,
>  	swap_inode_data(inode, inode_bl);
>  
>  	inode->i_ctime = inode_bl->i_ctime = current_time(inode);
> +	inode_inc_iversion(inode);
>  
>  	inode->i_generation = prandom_u32();
>  	inode_bl->i_generation = prandom_u32();
> @@ -665,6 +666,7 @@ static int ext4_ioctl_setflags(struct inode *inode,
>  	ext4_set_inode_flags(inode, false);
>  
>  	inode->i_ctime = current_time(inode);
> +	inode_inc_iversion(inode);
>  
>  	err = ext4_mark_iloc_dirty(handle, inode, &iloc);
>  flags_err:
> @@ -775,6 +777,7 @@ static int ext4_ioctl_setproject(struct inode *inode, __u32 projid)
>  
>  	EXT4_I(inode)->i_projid = kprojid;
>  	inode->i_ctime = current_time(inode);
> +	inode_inc_iversion(inode);
>  out_dirty:
>  	rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
>  	if (!err)
> @@ -1257,6 +1260,7 @@ static long __ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
>  		err = ext4_reserve_inode_write(handle, inode, &iloc);
>  		if (err == 0) {
>  			inode->i_ctime = current_time(inode);
> +			inode_inc_iversion(inode);
>  			inode->i_generation = generation;
>  			err = ext4_mark_iloc_dirty(handle, inode, &iloc);
>  		}
> diff --git a/fs/ext4/move_extent.c b/fs/ext4/move_extent.c
> index 701f1d6a217f..285700b00d38 100644
> --- a/fs/ext4/move_extent.c
> +++ b/fs/ext4/move_extent.c
> @@ -6,6 +6,7 @@
>   */
>  
>  #include <linux/fs.h>
> +#include <linux/iversion.h>
>  #include <linux/quotaops.h>
>  #include <linux/slab.h>
>  #include <linux/sched/mm.h>
> @@ -683,6 +684,11 @@ ext4_move_extents(struct file *o_filp, struct file *d_filp, __u64 orig_blk,
>  			break;
>  		o_start += cur_len;
>  		d_start += cur_len;
> +
> +		orig_inode->i_ctime = current_time(orig_inode);
> +		donor_inode->i_ctime = current_time(donor_inode);
> +		inode_inc_iversion(orig_inode);
> +		inode_inc_iversion(donor_inode);
>  	}
>  	*moved_len = o_start - orig_blk;
>  	if (*moved_len > len)
> diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
> index 533216e80fa2..e975442e4ab2 100644
> --- a/fs/ext4/xattr.c
> +++ b/fs/ext4/xattr.c
> @@ -2412,6 +2412,8 @@ ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index,
>  	if (!error) {
>  		ext4_xattr_update_super_block(handle, inode->i_sb);
>  		inode->i_ctime = current_time(inode);
> +		if (IS_I_VERSION(inode))
> +			inode_inc_iversion(inode);
>  		if (!value)
>  			no_expand = 0;
>  		error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
diff mbox series

Patch

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 601214453c3a..aa37bce4c541 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -5342,6 +5342,7 @@  int ext4_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
 	int error, rc = 0;
 	int orphan = 0;
 	const unsigned int ia_valid = attr->ia_valid;
+	bool inc_ivers = IS_I_VERSION(inode);
 
 	if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
 		return -EIO;
@@ -5425,8 +5426,8 @@  int ext4_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
 			return -EINVAL;
 		}
 
-		if (IS_I_VERSION(inode) && attr->ia_size != inode->i_size)
-			inode_inc_iversion(inode);
+		if (attr->ia_size == inode->i_size)
+			inc_ivers = false;
 
 		if (shrink) {
 			if (ext4_should_order_data(inode)) {
@@ -5528,6 +5529,8 @@  int ext4_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
 	}
 
 	if (!error) {
+		if (inc_ivers)
+			inode_inc_iversion(inode);
 		setattr_copy(mnt_userns, inode, attr);
 		mark_inode_dirty(inode);
 	}
@@ -5731,9 +5734,6 @@  int ext4_mark_iloc_dirty(handle_t *handle,
 	}
 	ext4_fc_track_inode(handle, inode);
 
-	if (IS_I_VERSION(inode))
-		inode_inc_iversion(inode);
-
 	/* the do_update_inode consumes one bh->b_count */
 	get_bh(iloc->bh);
 
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index 3cf3ec4b1c21..ad3a294a88eb 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -452,6 +452,7 @@  static long swap_inode_boot_loader(struct super_block *sb,
 	swap_inode_data(inode, inode_bl);
 
 	inode->i_ctime = inode_bl->i_ctime = current_time(inode);
+	inode_inc_iversion(inode);
 
 	inode->i_generation = prandom_u32();
 	inode_bl->i_generation = prandom_u32();
@@ -665,6 +666,7 @@  static int ext4_ioctl_setflags(struct inode *inode,
 	ext4_set_inode_flags(inode, false);
 
 	inode->i_ctime = current_time(inode);
+	inode_inc_iversion(inode);
 
 	err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 flags_err:
@@ -775,6 +777,7 @@  static int ext4_ioctl_setproject(struct inode *inode, __u32 projid)
 
 	EXT4_I(inode)->i_projid = kprojid;
 	inode->i_ctime = current_time(inode);
+	inode_inc_iversion(inode);
 out_dirty:
 	rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
 	if (!err)
@@ -1257,6 +1260,7 @@  static long __ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 		err = ext4_reserve_inode_write(handle, inode, &iloc);
 		if (err == 0) {
 			inode->i_ctime = current_time(inode);
+			inode_inc_iversion(inode);
 			inode->i_generation = generation;
 			err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 		}
diff --git a/fs/ext4/move_extent.c b/fs/ext4/move_extent.c
index 701f1d6a217f..285700b00d38 100644
--- a/fs/ext4/move_extent.c
+++ b/fs/ext4/move_extent.c
@@ -6,6 +6,7 @@ 
  */
 
 #include <linux/fs.h>
+#include <linux/iversion.h>
 #include <linux/quotaops.h>
 #include <linux/slab.h>
 #include <linux/sched/mm.h>
@@ -683,6 +684,11 @@  ext4_move_extents(struct file *o_filp, struct file *d_filp, __u64 orig_blk,
 			break;
 		o_start += cur_len;
 		d_start += cur_len;
+
+		orig_inode->i_ctime = current_time(orig_inode);
+		donor_inode->i_ctime = current_time(donor_inode);
+		inode_inc_iversion(orig_inode);
+		inode_inc_iversion(donor_inode);
 	}
 	*moved_len = o_start - orig_blk;
 	if (*moved_len > len)
diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
index 533216e80fa2..e975442e4ab2 100644
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -2412,6 +2412,8 @@  ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index,
 	if (!error) {
 		ext4_xattr_update_super_block(handle, inode->i_sb);
 		inode->i_ctime = current_time(inode);
+		if (IS_I_VERSION(inode))
+			inode_inc_iversion(inode);
 		if (!value)
 			no_expand = 0;
 		error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);