diff options
Diffstat (limited to 'fs/gfs2/inode.c')
| -rw-r--r-- | fs/gfs2/inode.c | 40 |
1 files changed, 30 insertions, 10 deletions
diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c index 28cc7bf6575..e62e5947788 100644 --- a/fs/gfs2/inode.c +++ b/fs/gfs2/inode.c @@ -1613,18 +1613,26 @@ int gfs2_permission(struct inode *inode, int mask) { struct gfs2_inode *ip; struct gfs2_holder i_gh; + struct gfs2_sbd *sdp = GFS2_SB(inode); int error; int unlock = 0; + int frozen_root = 0; ip = GFS2_I(inode); if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { - if (mask & MAY_NOT_BLOCK) - return -ECHILD; - error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); - if (error) - return error; - unlock = 1; + if (unlikely(gfs2_glock_is_held_excl(sdp->sd_freeze_gl) && + inode == sdp->sd_root_dir->d_inode && + atomic_inc_not_zero(&sdp->sd_frozen_root))) + frozen_root = 1; + else { + if (mask & MAY_NOT_BLOCK) + return -ECHILD; + error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); + if (error) + return error; + unlock = 1; + } } if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) @@ -1633,6 +1641,8 @@ int gfs2_permission(struct inode *inode, int mask) error = generic_permission(inode, mask); if (unlock) gfs2_glock_dq_uninit(&i_gh); + else if (frozen_root && atomic_dec_and_test(&sdp->sd_frozen_root)) + wake_up(&sdp->sd_frozen_root_wait); return error; } @@ -1805,19 +1815,29 @@ static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry, struct inode *inode = dentry->d_inode; struct gfs2_inode *ip = GFS2_I(inode); struct gfs2_holder gh; + struct gfs2_sbd *sdp = GFS2_SB(inode); int error; int unlock = 0; + int frozen_root = 0; if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { - error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); - if (error) - return error; - unlock = 1; + if (unlikely(gfs2_glock_is_held_excl(sdp->sd_freeze_gl) && + inode == sdp->sd_root_dir->d_inode && + atomic_inc_not_zero(&sdp->sd_frozen_root))) + frozen_root = 1; + else { + error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); + if (error) + return error; + unlock = 1; + } } generic_fillattr(inode, stat); if (unlock) gfs2_glock_dq_uninit(&gh); + else if (frozen_root && atomic_dec_and_test(&sdp->sd_frozen_root)) + wake_up(&sdp->sd_frozen_root_wait); return 0; } |