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NFS/flexfiles: Clean up mirror DS initialisation

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Get rid of the redundant parameter and rename the function
ff_layout_mirror_valid() to ff_layout_init_mirror_ds() for clarity.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust 2019-02-28 11:01:05 -05:00
parent 29a23909e4
commit cefa587a40
1 changed files with 31 additions and 35 deletions
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66
fs/nfs/flexfilelayout/flexfilelayoutdev.c
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@ -183,40 +183,6 @@ nfs4_ff_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev,
return NULL;
}
static bool ff_layout_mirror_valid(struct pnfs_layout_segment *lseg,
struct nfs4_ff_layout_mirror *mirror,
bool create)
{
if (mirror == NULL)
goto outerr;
if (mirror->mirror_ds == NULL) {
if (create) {
struct nfs4_deviceid_node *node;
struct pnfs_layout_hdr *lh = lseg->pls_layout;
struct nfs4_ff_layout_ds *mirror_ds = ERR_PTR(-ENODEV);
node = nfs4_find_get_deviceid(NFS_SERVER(lh->plh_inode),
&mirror->devid, lh->plh_lc_cred,
GFP_KERNEL);
if (node)
mirror_ds = FF_LAYOUT_MIRROR_DS(node);
/* check for race with another call to this function */
if (cmpxchg(&mirror->mirror_ds, NULL, mirror_ds) &&
mirror_ds != ERR_PTR(-ENODEV))
nfs4_put_deviceid_node(node);
} else
goto outerr;
}
if (IS_ERR(mirror->mirror_ds))
goto outerr;
return true;
outerr:
return false;
}
static void extend_ds_error(struct nfs4_ff_layout_ds_err *err,
u64 offset, u64 length)
{
@ -350,6 +316,36 @@ nfs4_ff_layout_select_ds_stateid(const struct nfs4_ff_layout_mirror *mirror,
nfs4_stateid_copy(stateid, &mirror->stateid);
}
static bool
ff_layout_init_mirror_ds(struct pnfs_layout_hdr *lo,
struct nfs4_ff_layout_mirror *mirror)
{
if (mirror == NULL)
goto outerr;
if (mirror->mirror_ds == NULL) {
struct nfs4_deviceid_node *node;
struct nfs4_ff_layout_ds *mirror_ds = ERR_PTR(-ENODEV);
node = nfs4_find_get_deviceid(NFS_SERVER(lo->plh_inode),
&mirror->devid, lo->plh_lc_cred,
GFP_KERNEL);
if (node)
mirror_ds = FF_LAYOUT_MIRROR_DS(node);
/* check for race with another call to this function */
if (cmpxchg(&mirror->mirror_ds, NULL, mirror_ds) &&
mirror_ds != ERR_PTR(-ENODEV))
nfs4_put_deviceid_node(node);
}
if (IS_ERR(mirror->mirror_ds))
goto outerr;
return true;
outerr:
return false;
}
/**
* nfs4_ff_layout_prepare_ds - prepare a DS connection for an RPC call
* @lseg: the layout segment we're operating on
@ -378,7 +374,7 @@ nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg,
unsigned int max_payload;
int status;
if (!ff_layout_mirror_valid(lseg, mirror, true))
if (!ff_layout_init_mirror_ds(lseg->pls_layout, mirror))
goto noconnect;
ds = mirror->mirror_ds->ds;