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Date: Thu, 24 Nov 2016 13:45:42 +0100
From: Jan Kara <jack@...e.cz>
To: Theodore Ts'o <tytso@....edu>
Cc: Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH 1/2] ext4: allow ext4_truncate() to return an error
On Sun 13-11-16 17:33:11, Ted Tso wrote:
> This allows us to properly propagate errors back up to
> ext4_truncate()'s callers. This also means we no longer have to
> silently ignore some errors (e.g., when trying to add the inode to the
> orphan inode list).
>
> Signed-off-by: Theodore Ts'o <tytso@....edu>
Looks good. You can add:
Reviewed-by: Jan Kara <jack@...e.cz>
Honza
> ---
> fs/ext4/ext4.h | 2 +-
> fs/ext4/inode.c | 41 ++++++++++++++++++++++++++---------------
> fs/ext4/ioctl.c | 7 +++++--
> fs/ext4/super.c | 6 ++++--
> 4 files changed, 36 insertions(+), 20 deletions(-)
>
> diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
> index 282a51b07c57..be2282dcde7d 100644
> --- a/fs/ext4/ext4.h
> +++ b/fs/ext4/ext4.h
> @@ -2491,7 +2491,7 @@ extern int ext4_change_inode_journal_flag(struct inode *, int);
> extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
> extern int ext4_inode_attach_jinode(struct inode *inode);
> extern int ext4_can_truncate(struct inode *inode);
> -extern void ext4_truncate(struct inode *);
> +extern int ext4_truncate(struct inode *);
> extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
> extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
> extern void ext4_set_inode_flags(struct inode *);
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index 9c064727ed62..40ea090d2e0e 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -261,8 +261,15 @@ void ext4_evict_inode(struct inode *inode)
> "couldn't mark inode dirty (err %d)", err);
> goto stop_handle;
> }
> - if (inode->i_blocks)
> - ext4_truncate(inode);
> + if (inode->i_blocks) {
> + err = ext4_truncate(inode);
> + if (err) {
> + ext4_error(inode->i_sb,
> + "couldn't truncate inode %lu (err %d)",
> + inode->i_ino, err);
> + goto stop_handle;
> + }
> + }
>
> /*
> * ext4_ext_truncate() doesn't reserve any slop when it
> @@ -4091,10 +4098,11 @@ int ext4_inode_attach_jinode(struct inode *inode)
> * that's fine - as long as they are linked from the inode, the post-crash
> * ext4_truncate() run will find them and release them.
> */
> -void ext4_truncate(struct inode *inode)
> +int ext4_truncate(struct inode *inode)
> {
> struct ext4_inode_info *ei = EXT4_I(inode);
> unsigned int credits;
> + int err = 0;
> handle_t *handle;
> struct address_space *mapping = inode->i_mapping;
>
> @@ -4108,7 +4116,7 @@ void ext4_truncate(struct inode *inode)
> trace_ext4_truncate_enter(inode);
>
> if (!ext4_can_truncate(inode))
> - return;
> + return 0;
>
> ext4_clear_inode_flag(inode, EXT4_INODE_EOFBLOCKS);
>
> @@ -4120,13 +4128,13 @@ void ext4_truncate(struct inode *inode)
>
> ext4_inline_data_truncate(inode, &has_inline);
> if (has_inline)
> - return;
> + return 0;
> }
>
> /* If we zero-out tail of the page, we have to create jinode for jbd2 */
> if (inode->i_size & (inode->i_sb->s_blocksize - 1)) {
> if (ext4_inode_attach_jinode(inode) < 0)
> - return;
> + return 0;
> }
>
> if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
> @@ -4135,10 +4143,8 @@ void ext4_truncate(struct inode *inode)
> credits = ext4_blocks_for_truncate(inode);
>
> handle = ext4_journal_start(inode, EXT4_HT_TRUNCATE, credits);
> - if (IS_ERR(handle)) {
> - ext4_std_error(inode->i_sb, PTR_ERR(handle));
> - return;
> - }
> + if (IS_ERR(handle))
> + return PTR_ERR(handle);
>
> if (inode->i_size & (inode->i_sb->s_blocksize - 1))
> ext4_block_truncate_page(handle, mapping, inode->i_size);
> @@ -4152,7 +4158,8 @@ void ext4_truncate(struct inode *inode)
> * Implication: the file must always be in a sane, consistent
> * truncatable state while each transaction commits.
> */
> - if (ext4_orphan_add(handle, inode))
> + err = ext4_orphan_add(handle, inode);
> + if (err)
> goto out_stop;
>
> down_write(&EXT4_I(inode)->i_data_sem);
> @@ -4185,6 +4192,7 @@ void ext4_truncate(struct inode *inode)
> ext4_journal_stop(handle);
>
> trace_ext4_truncate_exit(inode);
> + return err;
> }
>
> /*
> @@ -5199,12 +5207,15 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr)
> * in data=journal mode to make pages freeable.
> */
> truncate_pagecache(inode, inode->i_size);
> - if (shrink)
> - ext4_truncate(inode);
> + if (shrink) {
> + rc = ext4_truncate(inode);
> + if (rc)
> + error = rc;
> + }
> up_write(&EXT4_I(inode)->i_mmap_sem);
> }
>
> - if (!rc) {
> + if (!error) {
> setattr_copy(inode, attr);
> mark_inode_dirty(inode);
> }
> @@ -5216,7 +5227,7 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr)
> if (orphan && inode->i_nlink)
> ext4_orphan_del(NULL, inode);
>
> - if (!rc && (ia_valid & ATTR_MODE))
> + if (!error && (ia_valid & ATTR_MODE))
> rc = posix_acl_chmod(inode, inode->i_mode);
>
> err_out:
> diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
> index bf5ae8ebbc97..99862a3726fc 100644
> --- a/fs/ext4/ioctl.c
> +++ b/fs/ext4/ioctl.c
> @@ -248,8 +248,11 @@ static int ext4_ioctl_setflags(struct inode *inode,
> err = -EOPNOTSUPP;
> goto flags_out;
> }
> - } else if (oldflags & EXT4_EOFBLOCKS_FL)
> - ext4_truncate(inode);
> + } else if (oldflags & EXT4_EOFBLOCKS_FL) {
> + err = ext4_truncate(inode);
> + if (err)
> + goto flags_out;
> + }
>
> handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
> if (IS_ERR(handle)) {
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index 20da99da0a34..e4f61c39328a 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -2330,7 +2330,7 @@ static void ext4_orphan_cleanup(struct super_block *sb,
> struct ext4_super_block *es)
> {
> unsigned int s_flags = sb->s_flags;
> - int nr_orphans = 0, nr_truncates = 0;
> + int ret, nr_orphans = 0, nr_truncates = 0;
> #ifdef CONFIG_QUOTA
> int i;
> #endif
> @@ -2412,7 +2412,9 @@ static void ext4_orphan_cleanup(struct super_block *sb,
> inode->i_ino, inode->i_size);
> inode_lock(inode);
> truncate_inode_pages(inode->i_mapping, inode->i_size);
> - ext4_truncate(inode);
> + ret = ext4_truncate(inode);
> + if (ret)
> + ext4_std_error(inode->i_sb, ret);
> inode_unlock(inode);
> nr_truncates++;
> } else {
> --
> 2.11.0.rc0.7.gbe5a750
>
> --
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--
Jan Kara <jack@...e.com>
SUSE Labs, CR
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