On 07/08/2010 01:34 AM, andros@xxxxxxxxxx wrote:
> From: Andy Adamson <andros@xxxxxxxxxx>
>
> Change nfs_inode layout field to a pointer
>
> Each layoutdriver embeds the pnfs_layout_type in it's private layout cache
> head structure, and allocates them both with the alloc_layout
> layoutdriver_io_operation.
>
> NOTE API change: the layoutdriver_io_operation alloc_layout and free_layout now
> use pnfs_layout_type pointers instead of void*.
>
> Signed-off-by: Andy Adamson <andros@xxxxxxxxxx>
> ---
> fs/nfs/callback_proc.c | 2 +-
> fs/nfs/inode.c | 12 +-----
> fs/nfs/nfs4proc.c | 2 +-
> fs/nfs/nfs4state.c | 4 +-
> fs/nfs/pnfs.c | 111 +++++++++++++++++++++++----------------------
> include/linux/nfs4_pnfs.h | 19 +++-----
> include/linux/nfs_fs.h | 4 +-
> 7 files changed, 71 insertions(+), 83 deletions(-)
>
> diff --git a/fs/nfs/callback_proc.c b/fs/nfs/callback_proc.c
> index 4766695..d999ea8 100644
> --- a/fs/nfs/callback_proc.c
> +++ b/fs/nfs/callback_proc.c
> @@ -233,7 +233,7 @@ static int pnfs_recall_layout(void *data)
> rl.cbl_seg.length = NFS4_MAX_UINT64;
>
> if (rl.cbl_recall_type == RETURN_FILE) {
> - if (pnfs_is_next_layout_stateid(&NFS_I(inode)->layout,
> + if (pnfs_is_next_layout_stateid(NFS_I(inode)->layout,
> rl.cbl_stateid))
> status = pnfs_return_layout(inode, &rl.cbl_seg,
> &rl.cbl_stateid, RETURN_FILE,
> diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
> index 3d51602..30252f4 100644
> --- a/fs/nfs/inode.c
> +++ b/fs/nfs/inode.c
> @@ -1397,17 +1397,7 @@ static inline void nfs4_init_once(struct nfs_inode *nfsi)
> #ifdef CONFIG_NFS_V4_1
> init_waitqueue_head(&nfsi->lo_waitq);
> nfsi->pnfs_layout_suspend = 0;
> - seqlock_init(&nfsi->layout.seqlock);
> - INIT_LIST_HEAD(&nfsi->layout.lo_layouts);
> - INIT_LIST_HEAD(&nfsi->layout.segs);
> - nfsi->layout.refcount = 0;
> - nfsi->layout.ld_data = NULL;
> - nfsi->layout.pnfs_layout_state = 0;
> - memset(&nfsi->layout.stateid, 0, NFS4_STATEID_SIZE);
> - nfsi->layout.roc_iomode = 0;
> - nfsi->layout.lo_cred = NULL;
> - nfsi->layout.pnfs_write_begin_pos = 0;
> - nfsi->layout.pnfs_write_end_pos = 0;
> + nfsi->layout = NULL;
> #endif /* CONFIG_NFS_V4_1 */
> #endif
> }
> diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
> index c5b8a2f..6acebc3 100644
> --- a/fs/nfs/nfs4proc.c
> +++ b/fs/nfs/nfs4proc.c
> @@ -1086,7 +1086,7 @@ static void pnfs4_layout_reclaim(struct nfs4_state *state)
> * flag during grace period
> */
> pnfs_destroy_layout(NFS_I(state->inode));
> - pnfs_set_layout_stateid(&NFS_I(state->inode)->layout, &zero_stateid);
> + pnfs_set_layout_stateid(NFS_I(state->inode)->layout, &zero_stateid);
> #endif /* CONFIG_NFS_V4_1 */
> }
>
> diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
> index bfe679b..6f44cb0 100644
> --- a/fs/nfs/nfs4state.c
> +++ b/fs/nfs/nfs4state.c
> @@ -597,10 +597,10 @@ static void __nfs4_close(struct path *path, struct nfs4_state *state,
> #ifdef CONFIG_NFS_V4_1
> struct nfs_inode *nfsi = NFS_I(state->inode);
>
> - if (has_layout(nfsi) && nfsi->layout.roc_iomode) {
> + if (has_layout(nfsi) && nfsi->layout->roc_iomode) {
> struct nfs4_pnfs_layout_segment range;
>
> - range.iomode = nfsi->layout.roc_iomode;
> + range.iomode = nfsi->layout->roc_iomode;
> range.offset = 0;
> range.length = NFS4_MAX_UINT64;
> pnfs_return_layout(state->inode, &range, NULL,
> diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
> index 53c15b1..6d435ed 100644
> --- a/fs/nfs/pnfs.c
> +++ b/fs/nfs/pnfs.c
> @@ -152,10 +152,11 @@ pnfs_need_layoutcommit(struct nfs_inode *nfsi, struct nfs_open_context *ctx)
> {
> dprintk("%s: has_layout=%d ctx=%p\n", __func__, has_layout(nfsi), ctx);
> spin_lock(&nfsi->vfs_inode.i_lock);
> - if (has_layout(nfsi) && !layoutcommit_needed(nfsi)) {
> - nfsi->layout.lo_cred = get_rpccred(ctx->state->owner->so_cred);
> + if (has_layout(nfsi) && !
> + !test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->layout->pnfs_layout_state)) {
Is the "!!" intended
Why did you open code layoutcommit_needed() ?
> + nfsi->layout->lo_cred = get_rpccred(ctx->state->owner->so_cred);
> __set_bit(NFS_INO_LAYOUTCOMMIT,
> - &nfsi->layout.pnfs_layout_state);
> + &nfsi->layout->pnfs_layout_state);
> nfsi->change_attr++;
> spin_unlock(&nfsi->vfs_inode.i_lock);
> dprintk("%s: Set layoutcommit\n", __func__);
> @@ -175,17 +176,17 @@ pnfs_update_last_write(struct nfs_inode *nfsi, loff_t offset, size_t extent)
> loff_t end_pos;
>
> spin_lock(&nfsi->vfs_inode.i_lock);
> - if (offset < nfsi->layout.pnfs_write_begin_pos)
> - nfsi->layout.pnfs_write_begin_pos = offset;
> + if (offset < nfsi->layout->pnfs_write_begin_pos)
> + nfsi->layout->pnfs_write_begin_pos = offset;
> end_pos = offset + extent - 1; /* I'm being inclusive */
> - if (end_pos > nfsi->layout.pnfs_write_end_pos)
> - nfsi->layout.pnfs_write_end_pos = end_pos;
> + if (end_pos > nfsi->layout->pnfs_write_end_pos)
> + nfsi->layout->pnfs_write_end_pos = end_pos;
> dprintk("%s: Wrote %lu@%lu bpos %lu, epos: %lu\n",
> __func__,
> (unsigned long) extent,
> (unsigned long) offset ,
> - (unsigned long) nfsi->layout.pnfs_write_begin_pos,
> - (unsigned long) nfsi->layout.pnfs_write_end_pos);
> + (unsigned long) nfsi->layout->pnfs_write_begin_pos,
> + (unsigned long) nfsi->layout->pnfs_write_end_pos);
> spin_unlock(&nfsi->vfs_inode.i_lock);
> }
>
> @@ -326,10 +327,9 @@ get_layout(struct pnfs_layout_type *lo)
> static inline struct pnfs_layout_type *
> grab_current_layout(struct nfs_inode *nfsi)
> {
> - struct pnfs_layout_type *lo = &nfsi->layout;
> + struct pnfs_layout_type *lo = nfsi->layout;
>
> - BUG_ON_UNLOCKED_LO(lo);
> - if (!lo->ld_data)
> + if (!lo)
> return NULL;
> get_layout(lo);
> return lo;
> @@ -343,13 +343,13 @@ put_layout(struct pnfs_layout_type *lo)
>
> lo->refcount--;
> if (!lo->refcount) {
> - struct layoutdriver_io_operations *io_ops =
> - PNFS_LD_IO_OPS(lo);
> + struct layoutdriver_io_operations *io_ops = PNFS_LD_IO_OPS(lo);
> + struct nfs_inode *nfsi = PNFS_NFS_INODE(lo);
>
> - dprintk("%s: freeing layout %p\n", __func__, lo->ld_data);
> + dprintk("%s: freeing layout cache %p\n", __func__, lo);
> WARN_ON(!list_empty(&lo->lo_layouts));
> - io_ops->free_layout(lo->ld_data);
> - lo->ld_data = NULL;
> + io_ops->free_layout(lo);
> + nfsi->layout = NULL;
> }
> }
>
> @@ -381,14 +381,13 @@ pnfs_destroy_layout(struct nfs_inode *nfsi)
> lo = grab_current_layout(nfsi);
> if (lo) {
> pnfs_free_layout(lo, &range);
> - WARN_ON(!list_empty(&nfsi->layout.segs));
> - WARN_ON(!list_empty(&nfsi->layout.lo_layouts));
> - WARN_ON(nfsi->layout.ld_data);
> + WARN_ON(!list_empty(&nfsi->layout->segs));
> + WARN_ON(!list_empty(&nfsi->layout->lo_layouts));
>
> - if (nfsi->layout.refcount != 1)
> + if (nfsi->layout->refcount != 1)
> printk(KERN_WARNING "%s: layout refcount not=1 %d\n",
> - __func__, nfsi->layout.refcount);
> - WARN_ON(nfsi->layout.refcount != 1);
> + __func__, nfsi->layout->refcount);
> + WARN_ON(nfsi->layout->refcount != 1);
>
> put_layout(lo);
> }
> @@ -698,7 +697,7 @@ pnfs_return_layout_barrier(struct nfs_inode *nfsi,
> bool ret = false;
>
> spin_lock(&nfsi->vfs_inode.i_lock);
> - list_for_each_entry (lseg, &nfsi->layout.segs, fi_list) {
> + list_for_each_entry(lseg, &nfsi->layout->segs, fi_list) {
> if (!should_free_lseg(lseg, range))
> continue;
> lseg->valid = false;
> @@ -904,29 +903,33 @@ pnfs_insert_layout(struct pnfs_layout_type *lo,
> dprintk("%s:Return\n", __func__);
> }
>
> +/*
> + * Each layoutdriver embeds pnfs_layout_type as the first field in it's
> + * per-layout type layout cache structure and returns it ZEROed
> + * from layoutdriver_io_ops->alloc_layout
> + */
> static struct pnfs_layout_type *
> alloc_init_layout(struct inode *ino)
> {
> - void *ld_data;
> struct pnfs_layout_type *lo;
> struct layoutdriver_io_operations *io_ops;
>
> + BUG_ON(NFS_I(ino)->layout != NULL);
> io_ops = NFS_SERVER(ino)->pnfs_curr_ld->ld_io_ops;
> - lo = &NFS_I(ino)->layout;
> - ld_data = io_ops->alloc_layout(ino);
> - if (!ld_data) {
> + lo = io_ops->alloc_layout(ino);
> + if (!lo) {
> printk(KERN_ERR
> "%s: out of memory: io_ops->alloc_layout failed\n",
> __func__);
> return NULL;
> }
> -
> spin_lock(&ino->i_lock);
> - BUG_ON(lo->ld_data != NULL);
> - lo->ld_data = ld_data;
> - memset(&lo->stateid, 0, NFS4_STATEID_SIZE);
> lo->refcount = 1;
> - lo->roc_iomode = 0;
> + INIT_LIST_HEAD(&lo->lo_layouts);
> + INIT_LIST_HEAD(&lo->segs);
> + seqlock_init(&lo->seqlock);
> + lo->lo_inode = ino;
The spin_lock() could be moved to here, it's the single place
that actually touches the nfsi.
> + NFS_I(ino)->layout = lo;
> spin_unlock(&ino->i_lock);
> return lo;
> }
> @@ -961,7 +964,7 @@ get_lock_alloc_layout(struct inode *ino)
> * wait until bit is cleared if we lost this race.
> */
> res = wait_on_bit_lock(
> - &nfsi->layout.pnfs_layout_state,
> + &nfsi->layout->pnfs_layout_state,
> NFS_INO_LAYOUT_ALLOC,
> pnfs_wait_schedule, TASK_KILLABLE);
> if (res) {
> @@ -972,7 +975,7 @@ get_lock_alloc_layout(struct inode *ino)
> /* Was current_layout already allocated while we slept?
> * If so, retry get_lock'ing it. Otherwise, allocate it.
> */
> - if (nfsi->layout.ld_data) {
> + if (nfsi->layout) {
> spin_lock(&ino->i_lock);
> continue;
> }
> @@ -985,8 +988,8 @@ get_lock_alloc_layout(struct inode *ino)
>
> /* release the NFS_INO_LAYOUT_ALLOC bit and wake up waiters */
> clear_bit_unlock(NFS_INO_LAYOUT_ALLOC,
> - &nfsi->layout.pnfs_layout_state);
> - wake_up_bit(&nfsi->layout.pnfs_layout_state,
> + &nfsi->layout->pnfs_layout_state);
> + wake_up_bit(&nfsi->layout->pnfs_layout_state,
> NFS_INO_LAYOUT_ALLOC);
> break;
> }
> @@ -1113,12 +1116,12 @@ _pnfs_update_layout(struct inode *ino,
> }
>
> /* if get layout already failed once goto out */
> - if (test_bit(lo_fail_bit(iomode), &nfsi->layout.pnfs_layout_state)) {
> + if (test_bit(lo_fail_bit(iomode), &nfsi->layout->pnfs_layout_state)) {
> if (unlikely(nfsi->pnfs_layout_suspend &&
> get_seconds() >= nfsi->pnfs_layout_suspend)) {
> dprintk("%s: layout_get resumed\n", __func__);
> clear_bit(lo_fail_bit(iomode),
> - &nfsi->layout.pnfs_layout_state);
> + &nfsi->layout->pnfs_layout_state);
> nfsi->pnfs_layout_suspend = 0;
> } else
> goto out_put;
> @@ -1130,7 +1133,7 @@ _pnfs_update_layout(struct inode *ino,
> send_layoutget(ino, ctx, &arg, lsegpp, lo);
> out:
> dprintk("%s end, state 0x%lx lseg %p\n", __func__,
> - nfsi->layout.pnfs_layout_state, lseg);
> + nfsi->layout->pnfs_layout_state, lseg);
> return;
> out_put:
> if (lsegpp)
> @@ -1235,12 +1238,12 @@ pnfs_get_layout_done(struct nfs4_pnfs_layoutget *lgp, int rpc_status)
> /* remember that get layout failed and suspend trying */
> nfsi->pnfs_layout_suspend = suspend;
> set_bit(lo_fail_bit(lgp->args.lseg.iomode),
> - &nfsi->layout.pnfs_layout_state);
> + &nfsi->layout->pnfs_layout_state);
> dprintk("%s: layout_get suspended until %ld\n",
> __func__, suspend);
> out:
> dprintk("%s end (err:%d) state 0x%lx lseg %p\n",
> - __func__, lgp->status, nfsi->layout.pnfs_layout_state, lseg);
> + __func__, lgp->status, nfsi->layout->pnfs_layout_state, lseg);
> return;
> }
>
> @@ -1321,7 +1324,7 @@ pnfs_set_pg_test(struct inode *inode, struct nfs_pageio_descriptor *pgio)
>
> pgio->pg_test = NULL;
>
> - laytype = &NFS_I(inode)->layout;
> + laytype = NFS_I(inode)->layout;
> ld = NFS_SERVER(inode)->pnfs_curr_ld;
> if (!pnfs_enabled_sb(NFS_SERVER(inode)) || !laytype)
> return;
> @@ -1454,7 +1457,7 @@ pnfs_writepages(struct nfs_write_data *wdata, int how)
> numpages);
> wdata->pdata.lseg = lseg;
> trypnfs = nfss->pnfs_curr_ld->ld_io_ops->write_pagelist(
> - &nfsi->layout,
> + nfsi->layout,
> args->pages,
> args->pgbase,
> numpages,
> @@ -1507,7 +1510,7 @@ pnfs_readpages(struct nfs_read_data *rdata)
> __func__, numpages);
> rdata->pdata.lseg = lseg;
> trypnfs = nfss->pnfs_curr_ld->ld_io_ops->read_pagelist(
> - &nfsi->layout,
> + nfsi->layout,
> args->pages,
> args->pgbase,
> numpages,
> @@ -1568,7 +1571,7 @@ pnfs_commit(struct nfs_write_data *data, int sync)
> * This will be done by passing the buck to the layout driver.
> */
> data->pdata.lseg = NULL;
> - trypnfs = nfss->pnfs_curr_ld->ld_io_ops->commit(&nfsi->layout,
> + trypnfs = nfss->pnfs_curr_ld->ld_io_ops->commit(nfsi->layout,
> sync, data);
> dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
> return trypnfs;
> @@ -1639,14 +1642,14 @@ pnfs_layoutcommit_inode(struct inode *inode, int sync)
> /* Clear layoutcommit properties in the inode so
> * new lc info can be generated
> */
> - write_begin_pos = nfsi->layout.pnfs_write_begin_pos;
> - write_end_pos = nfsi->layout.pnfs_write_end_pos;
> - data->cred = nfsi->layout.lo_cred;
> - nfsi->layout.pnfs_write_begin_pos = 0;
> - nfsi->layout.pnfs_write_end_pos = 0;
> - nfsi->layout.lo_cred = NULL;
> - __clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->layout.pnfs_layout_state);
> - pnfs_get_layout_stateid(&data->args.stateid, &nfsi->layout);
> + write_begin_pos = nfsi->layout->pnfs_write_begin_pos;
> + write_end_pos = nfsi->layout->pnfs_write_end_pos;
> + data->cred = nfsi->layout->lo_cred;
> + nfsi->layout->pnfs_write_begin_pos = 0;
> + nfsi->layout->pnfs_write_end_pos = 0;
> + nfsi->layout->lo_cred = NULL;
> + __clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->layout->pnfs_layout_state);
> + pnfs_get_layout_stateid(&data->args.stateid, nfsi->layout);
>
> spin_unlock(&inode->i_lock);
>
> diff --git a/include/linux/nfs4_pnfs.h b/include/linux/nfs4_pnfs.h
> index c5af82f..2c6ce4c 100644
> --- a/include/linux/nfs4_pnfs.h
> +++ b/include/linux/nfs4_pnfs.h
> @@ -35,13 +35,13 @@ struct pnfs_layoutdriver_type {
> static inline struct nfs_inode *
> PNFS_NFS_INODE(struct pnfs_layout_type *lo)
> {
> - return container_of(lo, struct nfs_inode, layout);
> + return NFS_I(lo->lo_inode);
> }
>
> static inline struct inode *
> PNFS_INODE(struct pnfs_layout_type *lo)
> {
> - return &PNFS_NFS_INODE(lo)->vfs_inode;
> + return lo->lo_inode;
> }
>
> static inline struct nfs_server *
> @@ -50,12 +50,6 @@ PNFS_NFS_SERVER(struct pnfs_layout_type *lo)
> return NFS_SERVER(PNFS_INODE(lo));
> }
>
> -static inline void *
> -PNFS_LD_DATA(struct pnfs_layout_type *lo)
> -{
> - return lo->ld_data;
> -}
> -
> static inline struct pnfs_layoutdriver_type *
> PNFS_LD(struct pnfs_layout_type *lo)
> {
> @@ -77,13 +71,14 @@ PNFS_LD_POLICY_OPS(struct pnfs_layout_type *lo)
> static inline bool
> has_layout(struct nfs_inode *nfsi)
> {
> - return nfsi->layout.ld_data != NULL;
> + return nfsi->layout != NULL;
does this mean the same thing now?
You could perhaps optimize with a bit flag that is set on
first segment insert, and reset on last segment removal.
Or some other/better scheme.
> }
>
> static inline bool
> layoutcommit_needed(struct nfs_inode *nfsi)
> {
> - return test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->layout.pnfs_layout_state);
> + return has_layout(nfsi) &&
> + test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->layout->pnfs_layout_state);
What is the purpose of patch[1/1] ?
you are unlocked and asking about a layout pointer. Which according to you might
go away mid-flight?
> }
>
> #else /* CONFIG_NFS_V4_1 */
> @@ -149,8 +144,8 @@ struct layoutdriver_io_operations {
> /* Layout information. For each inode, alloc_layout is executed once to retrieve an
> * inode specific layout structure. Each subsequent layoutget operation results in
> * a set_layout call to set the opaque layout in the layout driver.*/
> - void * (*alloc_layout) (struct inode *inode);
> - void (*free_layout) (void *layoutid);
> + struct pnfs_layout_type * (*alloc_layout) (struct inode *inode);
> + void (*free_layout) (struct pnfs_layout_type *);
> struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_type *layoutid, struct nfs4_pnfs_layoutget_res *lgr);
> void (*free_lseg) (struct pnfs_layout_segment *lseg);
>
> diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h
> index b612746..7b999a4 100644
> --- a/include/linux/nfs_fs.h
> +++ b/include/linux/nfs_fs.h
> @@ -104,7 +104,6 @@ struct pnfs_layout_type {
> int roc_iomode; /* iomode to return on close, 0=none */
> seqlock_t seqlock; /* Protects the stateid */
> nfs4_stateid stateid;
> - void *ld_data; /* layout driver private data */
> unsigned long pnfs_layout_state;
> #define NFS_INO_RO_LAYOUT_FAILED 0 /* get ro layout failed stop trying */
> #define NFS_INO_RW_LAYOUT_FAILED 1 /* get rw layout failed stop trying */
> @@ -116,6 +115,7 @@ struct pnfs_layout_type {
> */
> loff_t pnfs_write_begin_pos;
> loff_t pnfs_write_end_pos;
> + struct inode *lo_inode;
> };
>
> /*
> @@ -206,7 +206,7 @@ struct nfs_inode {
> /* pNFS layout information */
> #if defined(CONFIG_NFS_V4_1)
> wait_queue_head_t lo_waitq;
> - struct pnfs_layout_type layout;
> + struct pnfs_layout_type *layout;
> time_t pnfs_layout_suspend;
> #endif /* CONFIG_NFS_V4_1 */
> #endif /* CONFIG_NFS_V4*/
--
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