linux/fs/ceph
Sage Weil db3540522e ceph: fix cap flush race reentrancy
In e9964c10 we change cap flushing to do a delicate dance because some
inodes on the cap_dirty list could be in a migrating state (got EXPORT but
not IMPORT) in which we couldn't actually flush and move from
dirty->flushing, breaking the while (!empty) { process first } loop
structure.  It worked for a single sync thread, but was not reentrant and
triggered infinite loops when multiple syncers came along.

Instead, move inodes with dirty to a separate cap_dirty_migrating list
when in the limbo export-but-no-import state, allowing us to go back to
the simple loop structure (which was reentrant).  This is cleaner and more
robust.

Audited the cap_dirty users and this looks fine:
list_empty(&ci->i_dirty_item) is still a reliable indicator of whether we
have dirty caps (which list we're on is irrelevant) and list_del_init()
calls still do the right thing.

Signed-off-by: Sage Weil <sage@newdream.net>
2011-05-24 11:52:12 -07:00
..
addr.c ceph: check return value for start_request in writepages 2011-05-19 11:25:05 -07:00
caps.c ceph: fix cap flush race reentrancy 2011-05-24 11:52:12 -07:00
ceph_frag.c ceph: factor out libceph from Ceph file system 2010-10-20 15:37:28 -07:00
debugfs.c ceph: remove debugfs debug cruft 2011-03-21 12:24:20 -07:00
dir.c ceph: fix broken comparison in readdir loop 2011-05-19 11:25:04 -07:00
export.c ceph: avoid inode lookup on nfs fh reconnect 2011-05-24 11:52:06 -07:00
file.c ceph: do not call __mark_dirty_inode under i_lock 2011-05-04 12:56:45 -07:00
inode.c ceph: do not use i_wrbuffer_ref as refcount for Fb cap 2011-05-11 10:44:48 -07:00
ioctl.c ceph: add CEPH_MDS_OP_SETDIRLAYOUT and associated ioctl. 2010-10-20 15:38:23 -07:00
ioctl.h ceph: fix ioctl magic 2010-12-06 09:45:22 -08:00
Kconfig ceph: factor out libceph from Ceph file system 2010-10-20 15:37:28 -07:00
locks.c ceph: Behave better when handling file lock replies. 2010-12-01 14:22:34 -08:00
Makefile ceph: Makefile: Remove unnessary code 2011-01-12 15:15:13 -08:00
mds_client.c ceph: fix cap flush race reentrancy 2011-05-24 11:52:12 -07:00
mds_client.h ceph: fix cap flush race reentrancy 2011-05-24 11:52:12 -07:00
mdsmap.c ceph: factor out libceph from Ceph file system 2010-10-20 15:37:28 -07:00
snap.c ceph: fix list_add in ceph_put_snap_realm 2011-05-11 10:44:36 -07:00
strings.c ceph: factor out libceph from Ceph file system 2010-10-20 15:37:28 -07:00
super.c ceph: Move secret key parsing earlier. 2011-03-29 12:11:16 -07:00
super.h ceph: do not use i_wrbuffer_ref as refcount for Fb cap 2011-05-11 10:44:48 -07:00
xattr.c ceph: do not call __mark_dirty_inode under i_lock 2011-05-04 12:56:45 -07:00