diff options
Diffstat (limited to 'fs/nfs/pnfs.c')
| -rw-r--r-- | fs/nfs/pnfs.c | 48 |
1 files changed, 26 insertions, 22 deletions
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c index cd99064..32b6646 100644 --- a/fs/nfs/pnfs.c +++ b/fs/nfs/pnfs.c @@ -177,34 +177,38 @@ EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver); * pNFS client layout cache */ +/* Need to hold i_lock if caller does not already hold reference */ static void -get_layout_hdr_locked(struct pnfs_layout_hdr *lo) +get_layout_hdr(struct pnfs_layout_hdr *lo) { - assert_spin_locked(&lo->plh_inode->i_lock); - lo->plh_refcount++; + atomic_inc(&lo->plh_refcount); } static void -put_layout_hdr_locked(struct pnfs_layout_hdr *lo) +destroy_layout_hdr(struct pnfs_layout_hdr *lo) { - assert_spin_locked(&lo->plh_inode->i_lock); - BUG_ON(lo->plh_refcount == 0); + dprintk("%s: freeing layout cache %p\n", __func__, lo); + BUG_ON(!list_empty(&lo->plh_layouts)); + NFS_I(lo->plh_inode)->layout = NULL; + kfree(lo); +} - lo->plh_refcount--; - if (!lo->plh_refcount) { - dprintk("%s: freeing layout cache %p\n", __func__, lo); - BUG_ON(!list_empty(&lo->plh_layouts)); - NFS_I(lo->plh_inode)->layout = NULL; - kfree(lo); - } +static void +put_layout_hdr_locked(struct pnfs_layout_hdr *lo) +{ + if (atomic_dec_and_test(&lo->plh_refcount)) + destroy_layout_hdr(lo); } void -put_layout_hdr(struct inode *inode) +put_layout_hdr(struct pnfs_layout_hdr *lo) { - spin_lock(&inode->i_lock); - put_layout_hdr_locked(NFS_I(inode)->layout); - spin_unlock(&inode->i_lock); + struct inode *inode = lo->plh_inode; + + if (atomic_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) { + destroy_layout_hdr(lo); + spin_unlock(&inode->i_lock); + } } static void @@ -223,7 +227,7 @@ static void free_lseg(struct pnfs_layout_segment *lseg) NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg); /* Matched by get_layout_hdr in pnfs_insert_layout */ - put_layout_hdr(ino); + put_layout_hdr(NFS_I(ino)->layout); } /* The use of tmp_list is necessary because pnfs_curr_ld->free_lseg @@ -490,7 +494,7 @@ pnfs_insert_layout(struct pnfs_layout_hdr *lo, __func__, lseg, lseg->pls_range.iomode, lseg->pls_range.offset, lseg->pls_range.length); } - get_layout_hdr_locked(lo); + get_layout_hdr(lo); dprintk("%s:Return\n", __func__); } @@ -503,7 +507,7 @@ alloc_init_layout_hdr(struct inode *ino) lo = kzalloc(sizeof(struct pnfs_layout_hdr), GFP_KERNEL); if (!lo) return NULL; - lo->plh_refcount = 1; + atomic_set(&lo->plh_refcount, 1); INIT_LIST_HEAD(&lo->plh_layouts); INIT_LIST_HEAD(&lo->plh_segs); lo->plh_inode = ino; @@ -618,7 +622,7 @@ pnfs_update_layout(struct inode *ino, goto out_unlock; atomic_inc(&lo->plh_outstanding); - get_layout_hdr_locked(lo); + get_layout_hdr(lo); if (list_empty(&lo->plh_segs)) { /* The lo must be on the clp list if there is any * chance of a CB_LAYOUTRECALL(FILE) coming in. @@ -641,7 +645,7 @@ pnfs_update_layout(struct inode *ino, spin_unlock(&ino->i_lock); } atomic_dec(&lo->plh_outstanding); - put_layout_hdr(ino); + put_layout_hdr(lo); out: dprintk("%s end, state 0x%lx lseg %p\n", __func__, nfsi->layout->plh_flags, lseg); |