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Diffstat (limited to 'fs/gfs2/inode.c')
-rw-r--r--fs/gfs2/inode.c40
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;
}