linux-ext4 - [Bug 216317] "ext4: lblock 0 mapped to illegal pblock" after upgrading to 5.19.0

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Date:   Tue, 02 Aug 2022 05:58:17 +0000
From:   bugzilla-daemon@...nel.org
To:     linux-ext4@...r.kernel.org
Subject: [Bug 216317] "ext4: lblock 0 mapped to illegal pblock" after
 upgrading to 5.19.0

https://bugzilla.kernel.org/show_bug.cgi?id=216317

--- Comment #2 from David Korth (gerbilsoft@...bilsoft.com) ---
After doing some searching, it looks like this commit may fix the issue:

https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/commit/?h=dev&id=f50f5a5eac8092fb9b3365ca4b1d7407cdab8427

ext4: fix reading leftover inlined symlinks
Since commit 6493792d3299 ("ext4: convert symlink external data block
mapping to bdev"), create new symlink with inline_data is not supported,
but it missing to handle the leftover inlined symlinks, which could
cause below error message and fail to read symlink.

 ls: cannot read symbolic link 'foo': Structure needs cleaning

 EXT4-fs error (device sda): ext4_map_blocks:605: inode #12: block
 2021161080: comm ls: lblock 0 mapped to illegal pblock 2021161080
 (length 1)

Fix this regression by adding ext4_read_inline_link(), which read the
inline data directly and convert it through a kmalloced buffer.

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