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-rw-r--r--fs/nfs/inode.c2
-rw-r--r--fs/nfs/pnfs.c130
-rw-r--r--fs/nfs/pnfs.h8
3 files changed, 96 insertions, 44 deletions
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index c7782b2..790b786 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -1410,9 +1410,9 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
*/
void nfs4_evict_inode(struct inode *inode)
{
+ pnfs_destroy_layout(NFS_I(inode));
truncate_inode_pages(&inode->i_data, 0);
end_writeback(inode);
- pnfs_destroy_layout(NFS_I(inode));
/* If we are holding a delegation, return it! */
nfs_inode_return_delegation_noreclaim(inode);
/* First call standard NFS clear_inode() code */
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index 08313f53..212cbc2 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -211,68 +211,109 @@ static void
init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg)
{
INIT_LIST_HEAD(&lseg->pls_list);
- kref_init(&lseg->pls_refcount);
+ atomic_set(&lseg->pls_refcount, 1);
+ smp_mb();
+ set_bit(NFS_LSEG_VALID, &lseg->pls_flags);
lseg->pls_layout = lo;
}
-/* Called without i_lock held, as the free_lseg call may sleep */
-static void
-destroy_lseg(struct kref *kref)
+static void free_lseg(struct pnfs_layout_segment *lseg)
{
- struct pnfs_layout_segment *lseg =
- container_of(kref, struct pnfs_layout_segment, pls_refcount);
struct inode *ino = lseg->pls_layout->plh_inode;
- dprintk("--> %s\n", __func__);
NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
/* Matched by get_layout_hdr in pnfs_insert_layout */
put_layout_hdr(ino);
}
-static void
-put_lseg(struct pnfs_layout_segment *lseg)
+/* The use of tmp_list is necessary because pnfs_curr_ld->free_lseg
+ * could sleep, so must be called outside of the lock.
+ * Returns 1 if object was removed, otherwise return 0.
+ */
+static int
+put_lseg_locked(struct pnfs_layout_segment *lseg,
+ struct list_head *tmp_list)
{
- if (!lseg)
- return;
+ dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
+ atomic_read(&lseg->pls_refcount),
+ test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
+ if (atomic_dec_and_test(&lseg->pls_refcount)) {
+ struct inode *ino = lseg->pls_layout->plh_inode;
- dprintk("%s: lseg %p ref %d\n", __func__, lseg,
- atomic_read(&lseg->pls_refcount.refcount));
- kref_put(&lseg->pls_refcount, destroy_lseg);
+ BUG_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
+ list_del(&lseg->pls_list);
+ if (list_empty(&lseg->pls_layout->plh_segs)) {
+ struct nfs_client *clp;
+
+ clp = NFS_SERVER(ino)->nfs_client;
+ spin_lock(&clp->cl_lock);
+ /* List does not take a reference, so no need for put here */
+ list_del_init(&lseg->pls_layout->plh_layouts);
+ spin_unlock(&clp->cl_lock);
+ }
+ list_add(&lseg->pls_list, tmp_list);
+ return 1;
+ }
+ return 0;
}
-static void
-pnfs_clear_lseg_list(struct pnfs_layout_hdr *lo, struct list_head *tmp_list)
+static bool
+should_free_lseg(u32 lseg_iomode, u32 recall_iomode)
{
- struct pnfs_layout_segment *lseg, *next;
- struct nfs_client *clp;
+ return (recall_iomode == IOMODE_ANY ||
+ lseg_iomode == recall_iomode);
+}
- dprintk("%s:Begin lo %p\n", __func__, lo);
+/* Returns 1 if lseg is removed from list, 0 otherwise */
+static int mark_lseg_invalid(struct pnfs_layout_segment *lseg,
+ struct list_head *tmp_list)
+{
+ int rv = 0;
- assert_spin_locked(&lo->plh_inode->i_lock);
- list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) {
- dprintk("%s: freeing lseg %p\n", __func__, lseg);
- list_move(&lseg->pls_list, tmp_list);
+ if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
+ /* Remove the reference keeping the lseg in the
+ * list. It will now be removed when all
+ * outstanding io is finished.
+ */
+ rv = put_lseg_locked(lseg, tmp_list);
}
- clp = NFS_SERVER(lo->plh_inode)->nfs_client;
- spin_lock(&clp->cl_lock);
- /* List does not take a reference, so no need for put here */
- list_del_init(&lo->plh_layouts);
- spin_unlock(&clp->cl_lock);
+ return rv;
+}
- dprintk("%s:Return\n", __func__);
+/* Returns count of number of matching invalid lsegs remaining in list
+ * after call.
+ */
+static int
+mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
+ struct list_head *tmp_list,
+ u32 iomode)
+{
+ struct pnfs_layout_segment *lseg, *next;
+ int invalid = 0, removed = 0;
+
+ dprintk("%s:Begin lo %p\n", __func__, lo);
+
+ list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
+ if (should_free_lseg(lseg->pls_range.iomode, iomode)) {
+ dprintk("%s: freeing lseg %p iomode %d "
+ "offset %llu length %llu\n", __func__,
+ lseg, lseg->pls_range.iomode, lseg->pls_range.offset,
+ lseg->pls_range.length);
+ invalid++;
+ removed += mark_lseg_invalid(lseg, tmp_list);
+ }
+ dprintk("%s:Return %i\n", __func__, invalid - removed);
+ return invalid - removed;
}
static void
-pnfs_free_lseg_list(struct list_head *tmp_list)
+pnfs_free_lseg_list(struct list_head *free_me)
{
- struct pnfs_layout_segment *lseg;
+ struct pnfs_layout_segment *lseg, *tmp;
- while (!list_empty(tmp_list)) {
- lseg = list_entry(tmp_list->next, struct pnfs_layout_segment,
- pls_list);
- dprintk("%s calling put_lseg on %p\n", __func__, lseg);
+ list_for_each_entry_safe(lseg, tmp, free_me, pls_list) {
list_del(&lseg->pls_list);
- put_lseg(lseg);
+ free_lseg(lseg);
}
}
@@ -285,7 +326,8 @@ pnfs_destroy_layout(struct nfs_inode *nfsi)
spin_lock(&nfsi->vfs_inode.i_lock);
lo = nfsi->layout;
if (lo) {
- pnfs_clear_lseg_list(lo, &tmp_list);
+ set_bit(NFS_LAYOUT_DESTROYED, &nfsi->layout->plh_flags);
+ mark_matching_lsegs_invalid(lo, &tmp_list, IOMODE_ANY);
/* Matched by refcount set to 1 in alloc_init_layout_hdr */
put_layout_hdr_locked(lo);
}
@@ -477,9 +519,12 @@ pnfs_find_alloc_layout(struct inode *ino)
dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout);
assert_spin_locked(&ino->i_lock);
- if (nfsi->layout)
- return nfsi->layout;
-
+ if (nfsi->layout) {
+ if (test_bit(NFS_LAYOUT_DESTROYED, &nfsi->layout->plh_flags))
+ return NULL;
+ else
+ return nfsi->layout;
+ }
spin_unlock(&ino->i_lock);
new = alloc_init_layout_hdr(ino);
spin_lock(&ino->i_lock);
@@ -520,7 +565,8 @@ pnfs_has_layout(struct pnfs_layout_hdr *lo, u32 iomode)
assert_spin_locked(&lo->plh_inode->i_lock);
list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
- if (is_matching_lseg(lseg, iomode)) {
+ if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) &&
+ is_matching_lseg(lseg, iomode)) {
ret = lseg;
break;
}
@@ -529,7 +575,7 @@ pnfs_has_layout(struct pnfs_layout_hdr *lo, u32 iomode)
}
dprintk("%s:Return lseg %p ref %d\n",
- __func__, ret, ret ? atomic_read(&ret->pls_refcount.refcount) : 0);
+ __func__, ret, ret ? atomic_read(&ret->pls_refcount) : 0);
return ret;
}
diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
index 1093720..787253e 100644
--- a/fs/nfs/pnfs.h
+++ b/fs/nfs/pnfs.h
@@ -30,10 +30,15 @@
#ifndef FS_NFS_PNFS_H
#define FS_NFS_PNFS_H
+enum {
+ NFS_LSEG_VALID = 0, /* cleared when lseg is recalled/returned */
+};
+
struct pnfs_layout_segment {
struct list_head pls_list;
struct pnfs_layout_range pls_range;
- struct kref pls_refcount;
+ atomic_t pls_refcount;
+ unsigned long pls_flags;
struct pnfs_layout_hdr *pls_layout;
};
@@ -44,6 +49,7 @@ struct pnfs_layout_segment {
enum {
NFS_LAYOUT_RO_FAILED = 0, /* get ro layout failed stop trying */
NFS_LAYOUT_RW_FAILED, /* get rw layout failed stop trying */
+ NFS_LAYOUT_DESTROYED, /* no new use of layout allowed */
};
/* Per-layout driver specific registration structure */
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