diff options
| author | Bob Peterson <rpeterso@redhat.com> | 2022-01-18 09:30:18 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-04-13 21:00:54 +0200 |
| commit | f349d7f9ee6d6c9cf9edadb0e1c5e9de6eda7466 (patch) | |
| tree | 45dae036cbebdf6bde1b1db252892b13148cf1ab /fs | |
| parent | 3f53715fd55c4616fc25ac0e45ca7331d8fdf7f1 (diff) | |
gfs2: Fix gfs2_release for non-writers regression
[ Upstream commit d3add1a9519dcacd6e644ecac741c56cf18b67f5 ]
When a file is opened for writing, the vfs code (do_dentry_open)
calls get_write_access for the inode, thus incrementing the inode's write
count. That writer normally then creates a multi-block reservation for
the inode (i_res) that can be re-used by other writers, which speeds up
writes for applications that stupidly loop on open/write/close.
When the writes are all done, the multi-block reservation should be
deleted when the file is closed by the last "writer."
Commit 0ec9b9ea4f83 broke that concept when it moved the call to
gfs2_rs_delete before the check for FMODE_WRITE. Non-writers have no
business removing the multi-block reservations of writers. In fact, if
someone opens and closes the file for RO while a writer has a
multi-block reservation, the RO closer will delete the reservation
midway through the write, and this results in:
kernel BUG at fs/gfs2/rgrp.c:677! (or thereabouts) which is:
BUG_ON(rs->rs_requested); from function gfs2_rs_deltree.
This patch moves the check back inside the check for FMODE_WRITE.
Fixes: 0ec9b9ea4f83 ("gfs2: Check for active reservation in gfs2_release")
Cc: stable@vger.kernel.org # v5.12+
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/gfs2/file.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c index 59318b1eaa60..7bd7581aa682 100644 --- a/fs/gfs2/file.c +++ b/fs/gfs2/file.c @@ -716,10 +716,11 @@ static int gfs2_release(struct inode *inode, struct file *file) kfree(file->private_data); file->private_data = NULL; - if (gfs2_rs_active(&ip->i_res)) - gfs2_rs_delete(ip, &inode->i_writecount); - if (file->f_mode & FMODE_WRITE) + if (file->f_mode & FMODE_WRITE) { + if (gfs2_rs_active(&ip->i_res)) + gfs2_rs_delete(ip, &inode->i_writecount); gfs2_qa_put(ip); + } return 0; } |