6.17-stable review patch. If anyone has any objections, please let me know.
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From: Andreas Gruenbacher agruenba@redhat.com
[ Upstream commit 6ab26555c9ffef96c56ca16356e55ac5ab61ec93 ]
GFS2 has been calling functions like dlm_lock() even after the lockspace that these functions operate on has been released with dlm_release_lockspace(). It has always assumed that those functions would return -EINVAL in that case, but that was never guaranteed, and it certainly is no longer the case since commit 4db41bf4f04f ("dlm: remove ls_local_handle from struct dlm_ls").
To fix that, add proper lockspace locking.
Fixes: 3e11e5304150 ("GFS2: ignore unlock failures after withdraw") Signed-off-by: Andreas Gruenbacher agruenba@redhat.com Reviewed-by: Andrew Price anprice@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/gfs2/file.c | 23 +++++++++++++++-------- fs/gfs2/glock.c | 5 ++--- fs/gfs2/incore.h | 2 ++ fs/gfs2/lock_dlm.c | 46 +++++++++++++++++++++++++++++++++++++--------- 4 files changed, 56 insertions(+), 20 deletions(-)
diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c index 72d95185a39f6..bc67fa058c845 100644 --- a/fs/gfs2/file.c +++ b/fs/gfs2/file.c @@ -1442,6 +1442,7 @@ static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl) struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host); struct lm_lockstruct *ls = &sdp->sd_lockstruct; + int ret;
if (!(fl->c.flc_flags & FL_POSIX)) return -ENOLCK; @@ -1450,14 +1451,20 @@ static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl) locks_lock_file_wait(file, fl); return -EIO; } - if (cmd == F_CANCELLK) - return dlm_posix_cancel(ls->ls_dlm, ip->i_no_addr, file, fl); - else if (IS_GETLK(cmd)) - return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl); - else if (lock_is_unlock(fl)) - return dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl); - else - return dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl); + down_read(&ls->ls_sem); + ret = -ENODEV; + if (likely(ls->ls_dlm != NULL)) { + if (cmd == F_CANCELLK) + ret = dlm_posix_cancel(ls->ls_dlm, ip->i_no_addr, file, fl); + else if (IS_GETLK(cmd)) + ret = dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl); + else if (lock_is_unlock(fl)) + ret = dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl); + else + ret = dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl); + } + up_read(&ls->ls_sem); + return ret; }
static void __flock_holder_uninit(struct file *file, struct gfs2_holder *fl_gh) diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c index 54c011ff00ddc..a6535413a0b46 100644 --- a/fs/gfs2/glock.c +++ b/fs/gfs2/glock.c @@ -800,9 +800,8 @@ __acquires(&gl->gl_lockref.lock) } clear_bit(GLF_PENDING_REPLY, &gl->gl_flags);
- if (ret == -EINVAL && gl->gl_target == LM_ST_UNLOCKED && - target == LM_ST_UNLOCKED && - test_bit(DFL_UNMOUNT, &ls->ls_recover_flags)) { + if (ret == -ENODEV && gl->gl_target == LM_ST_UNLOCKED && + target == LM_ST_UNLOCKED) { /* * The lockspace has been released and the lock has * been unlocked implicitly. diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h index c390f208654c1..3fcb7ab198d47 100644 --- a/fs/gfs2/incore.h +++ b/fs/gfs2/incore.h @@ -657,6 +657,8 @@ struct lm_lockstruct { struct completion ls_sync_wait; /* {control,mounted}_{lock,unlock} */ char *ls_lvb_bits;
+ struct rw_semaphore ls_sem; + spinlock_t ls_recover_spin; /* protects following fields */ unsigned long ls_recover_flags; /* DFL_ */ uint32_t ls_recover_mount; /* gen in first recover_done cb */ diff --git a/fs/gfs2/lock_dlm.c b/fs/gfs2/lock_dlm.c index 5daaeaaaf18dd..6db37c20587d1 100644 --- a/fs/gfs2/lock_dlm.c +++ b/fs/gfs2/lock_dlm.c @@ -329,8 +329,13 @@ static int gdlm_lock(struct gfs2_glock *gl, unsigned int req_state, */
again: - error = dlm_lock(ls->ls_dlm, req, &gl->gl_lksb, lkf, strname, - GDLM_STRNAME_BYTES - 1, 0, gdlm_ast, gl, gdlm_bast); + down_read(&ls->ls_sem); + error = -ENODEV; + if (likely(ls->ls_dlm != NULL)) { + error = dlm_lock(ls->ls_dlm, req, &gl->gl_lksb, lkf, strname, + GDLM_STRNAME_BYTES - 1, 0, gdlm_ast, gl, gdlm_bast); + } + up_read(&ls->ls_sem); if (error == -EBUSY) { msleep(20); goto again; @@ -379,8 +384,13 @@ static void gdlm_put_lock(struct gfs2_glock *gl) flags |= DLM_LKF_VALBLK;
again: - error = dlm_unlock(ls->ls_dlm, gl->gl_lksb.sb_lkid, flags, - NULL, gl); + down_read(&ls->ls_sem); + error = -ENODEV; + if (likely(ls->ls_dlm != NULL)) { + error = dlm_unlock(ls->ls_dlm, gl->gl_lksb.sb_lkid, flags, + NULL, gl); + } + up_read(&ls->ls_sem); if (error == -EBUSY) { msleep(20); goto again; @@ -396,7 +406,12 @@ static void gdlm_put_lock(struct gfs2_glock *gl) static void gdlm_cancel(struct gfs2_glock *gl) { struct lm_lockstruct *ls = &gl->gl_name.ln_sbd->sd_lockstruct; - dlm_unlock(ls->ls_dlm, gl->gl_lksb.sb_lkid, DLM_LKF_CANCEL, NULL, gl); + + down_read(&ls->ls_sem); + if (likely(ls->ls_dlm != NULL)) { + dlm_unlock(ls->ls_dlm, gl->gl_lksb.sb_lkid, DLM_LKF_CANCEL, NULL, gl); + } + up_read(&ls->ls_sem); }
/* @@ -577,7 +592,11 @@ static int sync_unlock(struct gfs2_sbd *sdp, struct dlm_lksb *lksb, char *name) struct lm_lockstruct *ls = &sdp->sd_lockstruct; int error;
- error = dlm_unlock(ls->ls_dlm, lksb->sb_lkid, 0, lksb, ls); + down_read(&ls->ls_sem); + error = -ENODEV; + if (likely(ls->ls_dlm != NULL)) + error = dlm_unlock(ls->ls_dlm, lksb->sb_lkid, 0, lksb, ls); + up_read(&ls->ls_sem); if (error) { fs_err(sdp, "%s lkid %x error %d\n", name, lksb->sb_lkid, error); @@ -604,9 +623,14 @@ static int sync_lock(struct gfs2_sbd *sdp, int mode, uint32_t flags, memset(strname, 0, GDLM_STRNAME_BYTES); snprintf(strname, GDLM_STRNAME_BYTES, "%8x%16x", LM_TYPE_NONDISK, num);
- error = dlm_lock(ls->ls_dlm, mode, lksb, flags, - strname, GDLM_STRNAME_BYTES - 1, - 0, sync_wait_cb, ls, NULL); + down_read(&ls->ls_sem); + error = -ENODEV; + if (likely(ls->ls_dlm != NULL)) { + error = dlm_lock(ls->ls_dlm, mode, lksb, flags, + strname, GDLM_STRNAME_BYTES - 1, + 0, sync_wait_cb, ls, NULL); + } + up_read(&ls->ls_sem); if (error) { fs_err(sdp, "%s lkid %x flags %x mode %d error %d\n", name, lksb->sb_lkid, flags, mode, error); @@ -1333,6 +1357,7 @@ static int gdlm_mount(struct gfs2_sbd *sdp, const char *table) */
INIT_DELAYED_WORK(&sdp->sd_control_work, gfs2_control_func); + ls->ls_dlm = NULL; spin_lock_init(&ls->ls_recover_spin); ls->ls_recover_flags = 0; ls->ls_recover_mount = 0; @@ -1367,6 +1392,7 @@ static int gdlm_mount(struct gfs2_sbd *sdp, const char *table) * create/join lockspace */
+ init_rwsem(&ls->ls_sem); error = dlm_new_lockspace(fsname, cluster, flags, GDLM_LVB_SIZE, &gdlm_lockspace_ops, sdp, &ops_result, &ls->ls_dlm); @@ -1446,10 +1472,12 @@ static void gdlm_unmount(struct gfs2_sbd *sdp)
/* mounted_lock and control_lock will be purged in dlm recovery */ release: + down_write(&ls->ls_sem); if (ls->ls_dlm) { dlm_release_lockspace(ls->ls_dlm, 2); ls->ls_dlm = NULL; } + up_write(&ls->ls_sem);
free_recover_size(ls); }