The patch titled
Subject: nilfs2: fix fix very long mount time issue
has been removed from the -mm tree. Its filename was
nilfs2-fix-fix-very-long-mount-time-issue.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Vyacheslav Dubeyko <[email protected]>
Subject: nilfs2: fix fix very long mount time issue
There exists a situation when GC can work in background alone without any
other filesystem activity during significant time. The
nilfs_clean_segments() method calls nilfs_segctor_construct() that updates
superblocks in the case of NILFS_SC_SUPER_ROOT and THE_NILFS_DISCONTINUED
flags are set. But when GC is working alone the nilfs_clean_segments() is
called with unset THE_NILFS_DISCONTINUED flag. As a result, the update of
superblocks doesn't occurred all this time and in the case of SPOR
superblocks keep very old values of last super root placement.
SYMPTOMS:
Trying to mount a NILFS2 volume after SPOR in such environment ends with
very long mounting time (it can achieve about several hours in some
cases).
REPRODUCING PATH:
1. It needs to use external USB HDD, disable automount and doesn't
make any additional filesystem activity on the NILFS2 volume.
2. Generate temporary file with size about 100 - 500 GB (for example,
dd if=/dev/zero of=<file_name> bs=1073741824 count=200). The size of
file defines duration of GC working.
3. Then it needs to delete file.
4. Start GC manually by means of command "nilfs-clean -p 0". When you
start GC by means of such way then, at the end, superblocks is updated
by once. So, for simulation of SPOR, it needs to wait sometime (15 -
40 minutes) and simply switch off USB HDD manually.
5. Switch on USB HDD again and try to mount NILFS2 volume. As a
result, NILFS2 volume will mount during very long time.
REPRODUCIBILITY: 100%
FIX:
This patch adds checking that superblocks need to update and set
THE_NILFS_DISCONTINUED flag before nilfs_clean_segments() call.
Reported-by: Sergey Alexandrov <[email protected]>
Signed-off-by: Vyacheslav Dubeyko <[email protected]>
Tested-by: Vyacheslav Dubeyko <[email protected]>
Acked-by: Ryusuke Konishi <[email protected]>
Tested-by: Ryusuke Konishi <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
---
fs/nilfs2/ioctl.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff -puN fs/nilfs2/ioctl.c~nilfs2-fix-fix-very-long-mount-time-issue
fs/nilfs2/ioctl.c
--- a/fs/nilfs2/ioctl.c~nilfs2-fix-fix-very-long-mount-time-issue
+++ a/fs/nilfs2/ioctl.c
@@ -664,8 +664,11 @@ static int nilfs_ioctl_clean_segments(st
if (ret < 0)
printk(KERN_ERR "NILFS: GC failed during preparation: "
"cannot read source blocks: err=%d\n", ret);
- else
+ else {
+ if (nilfs_sb_need_update(nilfs))
+ set_nilfs_discontinued(nilfs);
ret = nilfs_clean_segments(inode->i_sb, argv, kbufs);
+ }
nilfs_remove_all_gcinodes(nilfs);
clear_nilfs_gc_running(nilfs);
_
Patches currently in -mm which might be from [email protected] are
origin.patch
hfsplus-add-osx-prefix-for-handling-namespace-of-mac-os-x-extended-attributes.patch
hfsplus-add-on-disk-layout-declarations-related-to-attributes-tree.patch
hfsplus-add-functionality-of-manipulating-by-records-in-attributes-tree.patch
hfsplus-rework-functionality-of-getting-setting-and-deleting-of-extended-attributes.patch
hfsplus-add-support-of-manipulation-by-attributes-file.patch
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