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authorTrond Myklebust <trond.myklebust@hammerspace.com>2018-06-23 10:28:40 -0400
committerTrond Myklebust <trond.myklebust@hammerspace.com>2018-07-26 16:25:24 -0400
commite0b7d420f72a66b5299da025be8e8a17e019a557 (patch)
treec14b30abf1cf02c1838974b88323b610a394379c
parentMerge tag 'usb-4.18-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb (diff)
downloadlinux-dev-e0b7d420f72a66b5299da025be8e8a17e019a557.tar.xz
linux-dev-e0b7d420f72a66b5299da025be8e8a17e019a557.zip
pNFS: Don't discard layout segments that are marked for return
If there are layout segments that are marked for return, then we need to ensure that pnfs_mark_matching_lsegs_return() does not just silently discard them, but it should tell the caller that there is a layoutreturn scheduled. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
-rw-r--r--fs/nfs/callback_proc.c21
-rw-r--r--fs/nfs/pnfs.c34
2 files changed, 39 insertions, 16 deletions
diff --git a/fs/nfs/callback_proc.c b/fs/nfs/callback_proc.c
index 64c214fb9da6..af2322256aa4 100644
--- a/fs/nfs/callback_proc.c
+++ b/fs/nfs/callback_proc.c
@@ -283,19 +283,22 @@ static u32 initiate_file_draining(struct nfs_client *clp,
goto unlock;
}
- if (pnfs_mark_matching_lsegs_return(lo, &free_me_list,
+ switch (pnfs_mark_matching_lsegs_return(lo, &free_me_list,
&args->cbl_range,
be32_to_cpu(args->cbl_stateid.seqid))) {
+ case 0:
+ case -EBUSY:
+ /* There are layout segments that need to be returned */
rv = NFS4_OK;
- goto unlock;
- }
-
- /* Embrace your forgetfulness! */
- rv = NFS4ERR_NOMATCHING_LAYOUT;
+ break;
+ case -ENOENT:
+ /* Embrace your forgetfulness! */
+ rv = NFS4ERR_NOMATCHING_LAYOUT;
- if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
- NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo,
- &args->cbl_range);
+ if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
+ NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo,
+ &args->cbl_range);
+ }
}
unlock:
spin_unlock(&ino->i_lock);
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index bcc3addec3c5..17776ef734d7 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -2238,15 +2238,31 @@ out_forget:
return ERR_PTR(-EAGAIN);
}
+static int
+mark_lseg_invalid_or_return(struct pnfs_layout_segment *lseg,
+ struct list_head *tmp_list)
+{
+ if (!mark_lseg_invalid(lseg, tmp_list))
+ return 0;
+ pnfs_cache_lseg_for_layoutreturn(lseg->pls_layout, lseg);
+ return 1;
+}
+
/**
* pnfs_mark_matching_lsegs_return - Free or return matching layout segments
* @lo: pointer to layout header
* @tmp_list: list header to be used with pnfs_free_lseg_list()
* @return_range: describe layout segment ranges to be returned
+ * @seq: stateid seqid to match
*
* This function is mainly intended for use by layoutrecall. It attempts
* to free the layout segment immediately, or else to mark it for return
* as soon as its reference count drops to zero.
+ *
+ * Returns
+ * - 0: a layoutreturn needs to be scheduled.
+ * - EBUSY: there are layout segment that are still in use.
+ * - ENOENT: there are no layout segments that need to be returned.
*/
int
pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
@@ -2259,9 +2275,6 @@ pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
dprintk("%s:Begin lo %p\n", __func__, lo);
- if (list_empty(&lo->plh_segs))
- return 0;
-
assert_spin_locked(&lo->plh_inode->i_lock);
list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
@@ -2271,16 +2284,23 @@ pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
lseg, lseg->pls_range.iomode,
lseg->pls_range.offset,
lseg->pls_range.length);
- if (mark_lseg_invalid(lseg, tmp_list))
+ if (mark_lseg_invalid_or_return(lseg, tmp_list))
continue;
remaining++;
set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
}
- if (remaining)
+ if (remaining) {
pnfs_set_plh_return_info(lo, return_range->iomode, seq);
+ return -EBUSY;
+ }
- return remaining;
+ if (!list_empty(&lo->plh_return_segs)) {
+ pnfs_set_plh_return_info(lo, return_range->iomode, seq);
+ return 0;
+ }
+
+ return -ENOENT;
}
void pnfs_error_mark_layout_for_return(struct inode *inode,
@@ -2305,7 +2325,7 @@ void pnfs_error_mark_layout_for_return(struct inode *inode,
* segments at hand when sending layoutreturn. See pnfs_put_lseg()
* for how it works.
*/
- if (!pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs, &range, 0)) {
+ if (pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs, &range, 0) != -EBUSY) {
nfs4_stateid stateid;
enum pnfs_iomode iomode;