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NFSv4.1/pNFS: pnfs_error_mark_layout_for_return() must always return layout

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Fix a bug whereby if all the layout segments could be immediately freed,
the call to pnfs_error_mark_layout_for_return() would never result in
a layoutreturn.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust 2016-01-04 11:23:52 -05:00
parent 5c97f5de2c
commit 10335556c9
2 changed files with 21 additions and 7 deletions
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26
fs/nfs/pnfs.c
View File

@ -1768,17 +1768,18 @@ pnfs_set_plh_return_iomode(struct pnfs_layout_hdr *lo, enum pnfs_iomode iomode)
lo->plh_return_iomode = iomode;
}
void
int
pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
struct list_head *tmp_list,
struct pnfs_layout_range *return_range)
{
struct pnfs_layout_segment *lseg, *next;
int remaining = 0;
dprintk("%s:Begin lo %p\n", __func__, lo);
if (list_empty(&lo->plh_segs))
return;
return 0;
assert_spin_locked(&lo->plh_inode->i_lock);
@ -1791,10 +1792,12 @@ pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
lseg->pls_range.length);
set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
pnfs_set_plh_return_iomode(lo, return_range->iomode);
mark_lseg_invalid(lseg, tmp_list);
if (!mark_lseg_invalid(lseg, tmp_list))
remaining++;
set_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE,
&lo->plh_flags);
}
return remaining;
}
void pnfs_error_mark_layout_for_return(struct inode *inode,
@ -1808,6 +1811,7 @@ void pnfs_error_mark_layout_for_return(struct inode *inode,
.length = NFS4_MAX_UINT64,
};
LIST_HEAD(free_me);
bool return_now = false;
spin_lock(&inode->i_lock);
/* set failure bit so that pnfs path will be retried later */
@ -1818,10 +1822,20 @@ void pnfs_error_mark_layout_for_return(struct inode *inode,
* segments at hand when sending layoutreturn. See pnfs_put_lseg()
* for how it works.
*/
pnfs_mark_matching_lsegs_return(lo, &free_me, &range);
spin_unlock(&inode->i_lock);
if (!pnfs_mark_matching_lsegs_return(lo, &free_me, &range)) {
nfs4_stateid stateid;
enum pnfs_iomode iomode = lo->plh_return_iomode;
nfs4_stateid_copy(&stateid, &lo->plh_stateid);
return_now = pnfs_prepare_layoutreturn(lo);
spin_unlock(&inode->i_lock);
if (return_now)
pnfs_send_layoutreturn(lo, &stateid, iomode, false);
} else {
spin_unlock(&inode->i_lock);
nfs_commit_inode(inode, 0);
}
pnfs_free_lseg_list(&free_me);
nfs_commit_inode(inode, 0);
}
EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return);

2
fs/nfs/pnfs.h
View File

@ -266,7 +266,7 @@ int pnfs_choose_layoutget_stateid(nfs4_stateid *dst,
int pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
struct list_head *tmp_list,
struct pnfs_layout_range *recall_range);
void pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
int pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
struct list_head *tmp_list,
struct pnfs_layout_range *recall_range);
bool pnfs_roc(struct inode *ino);