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pNFS: Add infrastructure for cleaning up per-layout commit structures

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Ensure that both the file and flexfiles layout types clean up when
freeing the layout segments.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust
2020-03-20 16:04:06 -04:00
parent e3b9f7e60b
commit a9901899b6
7 changed files with 121 additions and 4 deletions
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88
fs/nfs/pnfs_nfs.c
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@@ -118,6 +118,67 @@ pnfs_free_commit_array(struct pnfs_commit_array *p)
}
EXPORT_SYMBOL_GPL(pnfs_free_commit_array);
static void
pnfs_release_commit_array_locked(struct pnfs_commit_array *array)
{
list_del_rcu(&array->cinfo_list);
list_del(&array->lseg_list);
pnfs_free_commit_array(array);
}
static void
pnfs_put_commit_array_locked(struct pnfs_commit_array *array)
{
if (refcount_dec_and_test(&array->refcount))
pnfs_release_commit_array_locked(array);
}
static void
pnfs_put_commit_array(struct pnfs_commit_array *array, struct inode *inode)
{
if (refcount_dec_and_lock(&array->refcount, &inode->i_lock)) {
pnfs_release_commit_array_locked(array);
spin_unlock(&inode->i_lock);
}
}
static struct pnfs_commit_array *
pnfs_get_commit_array(struct pnfs_commit_array *array)
{
if (refcount_inc_not_zero(&array->refcount))
return array;
return NULL;
}
static void
pnfs_remove_and_free_commit_array(struct pnfs_commit_array *array)
{
array->lseg = NULL;
list_del_init(&array->lseg_list);
pnfs_put_commit_array_locked(array);
}
void
pnfs_generic_ds_cinfo_release_lseg(struct pnfs_ds_commit_info *fl_cinfo,
struct pnfs_layout_segment *lseg)
{
struct pnfs_commit_array *array, *tmp;
list_for_each_entry_safe(array, tmp, &lseg->pls_commits, lseg_list)
pnfs_remove_and_free_commit_array(array);
}
EXPORT_SYMBOL_GPL(pnfs_generic_ds_cinfo_release_lseg);
void
pnfs_generic_ds_cinfo_destroy(struct pnfs_ds_commit_info *fl_cinfo)
{
struct pnfs_commit_array *array, *tmp;
list_for_each_entry_safe(array, tmp, &fl_cinfo->commits, cinfo_list)
pnfs_remove_and_free_commit_array(array);
}
EXPORT_SYMBOL_GPL(pnfs_generic_ds_cinfo_destroy);
/*
* Locks the nfs_page requests for commit and moves them to
* @bucket->committing.
@@ -177,14 +238,21 @@ int pnfs_generic_scan_commit_lists(struct nfs_commit_info *cinfo, int max)
max -= cnt;
if (!max)
return rv;
list_for_each_entry(array, &fl_cinfo->commits, cinfo_list) {
rcu_read_lock();
list_for_each_entry_rcu(array, &fl_cinfo->commits, cinfo_list) {
if (!array->lseg || !pnfs_get_commit_array(array))
continue;
rcu_read_unlock();
cnt = pnfs_bucket_scan_array(cinfo, array->buckets,
array->nbuckets, max);
rcu_read_lock();
pnfs_put_commit_array(array, cinfo->inode);
rv += cnt;
max -= cnt;
if (!max)
break;
}
rcu_read_unlock();
return rv;
}
EXPORT_SYMBOL_GPL(pnfs_generic_scan_commit_lists);
@@ -230,13 +298,20 @@ void pnfs_generic_recover_commit_reqs(struct list_head *dst,
fl_cinfo->nbuckets,
cinfo);
fl_cinfo->nwritten -= nwritten;
list_for_each_entry(array, &fl_cinfo->commits, cinfo_list) {
rcu_read_lock();
list_for_each_entry_rcu(array, &fl_cinfo->commits, cinfo_list) {
if (!array->lseg || !pnfs_get_commit_array(array))
continue;
rcu_read_unlock();
nwritten = pnfs_bucket_recover_commit_reqs(dst,
array->buckets,
array->nbuckets,
cinfo);
rcu_read_lock();
pnfs_put_commit_array(array, cinfo->inode);
fl_cinfo->nwritten -= nwritten;
}
rcu_read_unlock();
}
EXPORT_SYMBOL_GPL(pnfs_generic_recover_commit_reqs);
@@ -330,9 +405,16 @@ pnfs_alloc_ds_commits_list(struct list_head *list,
struct pnfs_commit_array *array;
unsigned int ret = 0;
list_for_each_entry(array, &fl_cinfo->commits, cinfo_list)
rcu_read_lock();
list_for_each_entry_rcu(array, &fl_cinfo->commits, cinfo_list) {
if (!array->lseg || !pnfs_get_commit_array(array))
continue;
rcu_read_unlock();
ret += pnfs_bucket_alloc_ds_commits(list, array->buckets,
array->nbuckets, cinfo);
rcu_read_lock();
pnfs_put_commit_array(array, cinfo->inode);
}
return ret;
}