mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/
synced 2026-09-26 18:16:26 +00:00
No description
- C 96.9%
- Assembly 0.9%
- Rust 0.6%
- Shell 0.6%
- Python 0.5%
- Other 0.3%
45d8ec4d9f
Currently in ext4 direct write path, we update i_disksize only when new eof is greater than i_size, and don't update it even when new eof is greater than i_disksize but less than i_size. This doesn't work well with delalloc buffer write, which updates i_size and i_disksize only when delalloc blocks are resolved (at writeback time), the i_disksize from direct write can be lost if a previous buffer write succeeded at write time but failed at writeback time, then results in corrupted ondisk inode size. Consider this case, first buffer write 4k data to a new file at offset 16k with delayed allocation, then direct write 4k data to the same file at offset 4k before delalloc blocks are resolved, which doesn't update i_disksize because it writes within i_size(20k), but the extent tree metadata has been committed in journal. Then writeback of the delalloc blocks fails (due to device error etc.), and i_size/i_disksize from buffer write can't be written to disk (still zero). A subsequent umount/mount cycle recovers journal and writes extent tree metadata from direct write to disk, but with i_disksize being zero. Fix it by updating i_disksize too in direct write path when new eof is greater than i_disksize but less than i_size, so i_disksize is always consistent with direct write. This fixes occasional i_size corruption in fstests generic/475. Signed-off-by: Eryu Guan <guaneryu@gmail.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu> |
History
|
|
|---|---|---|
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| firmware | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.