The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
Possible dependencies:
a642c2c0827f ("ext4: fix i_version handling in ext4") 1ff20307393e ("ext4: unconditionally enable the i_version counter") 50f094a5580e ("ext4: don't increase iversion counter for ea_inodes") 960e0ab63b2e ("ext4: fix i_version handling on remount") 4437992be7ca ("ext4: remove lazytime/nolazytime mount options handled by MS_LAZYTIME") cebe85d570cf ("ext4: switch to the new mount api") 02f960f8db1c ("ext4: clean up return values in handle_mount_opt()") 7edfd85b1ffd ("ext4: Completely separate options parsing and sb setup") 6e47a3cc68fc ("ext4: get rid of super block and sbi from handle_mount_ops()") b6bd243500b6 ("ext4: check ext2/3 compatibility outside handle_mount_opt()") e6e268cb6822 ("ext4: move quota configuration out of handle_mount_opt()") da812f611934 ("ext4: Allow sb to be NULL in ext4_msg()") 461c3af045d3 ("ext4: Change handle_mount_opt() to use fs_parameter") 4c94bff967d9 ("ext4: move option validation to a separate function") e5a185c26c11 ("ext4: Add fs parameter specifications for mount options") 9a089b21f79b ("ext4: Send notifications on error")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From a642c2c0827f5604a93f9fa1e5701eecdce4ae22 Mon Sep 17 00:00:00 2001 From: Jeff Layton jlayton@kernel.org Date: Thu, 8 Sep 2022 13:24:42 -0400 Subject: [PATCH] ext4: fix i_version handling in ext4
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 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 times 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.
[ Some minor updates since we've already enabled the i_version counter unconditionally already via another patch series. -- TYT ]
Cc: stable@kernel.org 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 Link: https://lore.kernel.org/r/20220908172448.208585-3-jlayton@kernel.org Signed-off-by: Theodore Ts'o tytso@mit.edu
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index a56c57375456..6da73be32bff 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -5349,6 +5349,7 @@ 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 = true;
if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) return -EIO; @@ -5432,8 +5433,8 @@ int ext4_setattr(struct user_namespace *mnt_userns, struct dentry *dentry, return -EINVAL; }
- if (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)) { @@ -5535,6 +5536,8 @@ 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); } @@ -5738,13 +5741,6 @@ int ext4_mark_iloc_dirty(handle_t *handle, } ext4_fc_track_inode(handle, inode);
- /* - * ea_inodes are using i_version for storing reference count, don't - * mess with it - */ - if (!(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL)) - 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/xattr.c b/fs/ext4/xattr.c index 533216e80fa2..36d6ba7190b6 100644 --- a/fs/ext4/xattr.c +++ b/fs/ext4/xattr.c @@ -2412,6 +2412,7 @@ 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); + inode_inc_iversion(inode); if (!value) no_expand = 0; error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);