From: "Darrick J. Wong" <darrick.wong@oracle.com>
To: Ritesh Harjani <riteshh@linux.ibm.com>
Cc: jack@suse.cz, tytso@mit.edu, linux-ext4@vger.kernel.org,
adilger.kernel@dilger.ca, linux-fsdevel@vger.kernel.org,
hch@infradead.org, cmaiolino@redhat.com
Subject: Re: [PATCHv3 4/6] ext4: Make ext4_ind_map_blocks work with fiemap
Date: Wed, 26 Feb 2020 08:11:50 -0800 [thread overview]
Message-ID: <20200226161150.GA8036@magnolia> (raw)
In-Reply-To: <56fc8d3802c578d27d49270600946a0737cef119.1582702694.git.riteshh@linux.ibm.com>
On Wed, Feb 26, 2020 at 03:27:06PM +0530, Ritesh Harjani wrote:
> For indirect block mapping if the i_block > max supported block in inode
> then ext4_ind_map_blocks may return a -EIO error. But in case of fiemap
> this could be a valid query to ext4_map_blocks.
> So in case if !create then return 0. This also makes ext4_warning to
> ext4_debug in ext4_block_to_path() for the same reason.
>
> Signed-off-by: Ritesh Harjani <riteshh@linux.ibm.com>
> ---
> fs/ext4/indirect.c | 11 +++++++++--
> 1 file changed, 9 insertions(+), 2 deletions(-)
>
> diff --git a/fs/ext4/indirect.c b/fs/ext4/indirect.c
> index 3a4ab70fe9e0..e1ab495dd900 100644
> --- a/fs/ext4/indirect.c
> +++ b/fs/ext4/indirect.c
> @@ -102,7 +102,11 @@ static int ext4_block_to_path(struct inode *inode,
> offsets[n++] = i_block & (ptrs - 1);
> final = ptrs;
> } else {
> - ext4_warning(inode->i_sb, "block %lu > max in inode %lu",
> + /*
> + * It's not yet an error to just query beyond max
> + * block in inode. Fiemap callers may do so.
> + */
> + ext4_debug("block %lu > max in inode %lu",
> i_block + direct_blocks +
> indirect_blocks + double_blocks, inode->i_ino);
Does that mean fiemap callers can spamflood dmesg with this message just
by setting the query start range to a huge value?
--D
> }
> @@ -537,8 +541,11 @@ int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
> depth = ext4_block_to_path(inode, map->m_lblk, offsets,
> &blocks_to_boundary);
>
> - if (depth == 0)
> + if (depth == 0) {
> + if (!(flags & EXT4_GET_BLOCKS_CREATE))
> + err = 0;
> goto out;
> + }
>
> partial = ext4_get_branch(inode, depth, offsets, chain, &err);
>
> --
> 2.21.0
>
next prev parent reply other threads:[~2020-02-26 16:12 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <cover.1582702693.git.riteshh@linux.ibm.com>
2020-02-26 9:57 ` [PATCHv3 1/6] ext4: Add IOMAP_F_MERGED for non-extent based mapping Ritesh Harjani
2020-02-26 12:26 ` Jan Kara
2020-02-26 12:33 ` Ritesh Harjani
2020-02-26 9:57 ` [PATCHv3 2/6] ext4: Optimize ext4_ext_precache for 0 depth Ritesh Harjani
2020-02-26 12:28 ` Jan Kara
2020-02-26 9:57 ` [PATCHv3 3/6] ext4: Move ext4 bmap to use iomap infrastructure Ritesh Harjani
2020-02-26 12:29 ` Jan Kara
2020-02-26 9:57 ` [PATCHv3 4/6] ext4: Make ext4_ind_map_blocks work with fiemap Ritesh Harjani
2020-02-26 12:39 ` Jan Kara
2020-02-26 12:47 ` Ritesh Harjani
2020-02-26 16:11 ` Darrick J. Wong [this message]
2020-02-27 5:27 ` Ritesh Harjani
2020-02-26 9:57 ` [PATCHv3 5/6] ext4: Move ext4_fiemap to use iomap framework Ritesh Harjani
2020-02-26 13:27 ` Jan Kara
2020-02-27 5:38 ` Ritesh Harjani
2020-02-26 9:57 ` [PATCHv3 6/6] Documentation: Correct the description of FIEMAP_EXTENT_LAST Ritesh Harjani
2020-02-26 13:05 ` Matthew Wilcox
2020-02-26 16:17 ` Darrick J. Wong
2020-02-26 17:26 ` Jan Kara
2020-02-27 3:24 ` Dave Chinner
2020-02-27 5:17 ` Ritesh Harjani
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