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nfs: Convert to separately allocated bdi 

Allocate struct backing_dev_info separately instead of embedding it
inside the superblock. This unifies handling of bdi among users.

CC: Anna Schumaker <anna.schumaker@netapp.com>
CC: linux-nfs@vger.kernel.org
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
Acked-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Jan Kara 2017-04-12 12:24:45 +02:00 committed by Jens Axboe
parent a0349ec00f
commit 0db10944a7
5 changed files with 28 additions and 36 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
fs/nfs/client.c
View File

@ -761,9 +761,6 @@ static void nfs_server_set_fsinfo(struct nfs_server *server,
server->rsize = NFS_MAX_FILE_IO_SIZE;
server->rpages = (server->rsize + PAGE_SIZE - 1) >> PAGE_SHIFT;
server->backing_dev_info.name = "nfs";
server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
if (server->wsize > max_rpc_payload)
server->wsize = max_rpc_payload;
if (server->wsize > NFS_MAX_FILE_IO_SIZE)
@ -917,12 +914,6 @@ struct nfs_server *nfs_alloc_server(void)
return NULL;
}
if (bdi_init(&server->backing_dev_info)) {
nfs_free_iostats(server->io_stats);
kfree(server);
return NULL;
}
ida_init(&server->openowner_id);
ida_init(&server->lockowner_id);
pnfs_init_server(server);
@ -953,7 +944,6 @@ void nfs_free_server(struct nfs_server *server)
ida_destroy(&server->lockowner_id);
ida_destroy(&server->openowner_id);
nfs_free_iostats(server->io_stats);
bdi_destroy(&server->backing_dev_info);
kfree(server);
nfs_release_automount_timer();
dprintk("<-- nfs_free_server()\n");

6
fs/nfs/internal.h
View File

@ -139,7 +139,7 @@ struct nfs_mount_request {
};
struct nfs_mount_info {
void (*fill_super)(struct super_block *, struct nfs_mount_info *);
int (*fill_super)(struct super_block *, struct nfs_mount_info *);
int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *);
struct nfs_parsed_mount_data *parsed;
struct nfs_clone_mount *cloned;
@ -407,7 +407,7 @@ struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *
struct dentry * nfs_xdev_mount_common(struct file_system_type *, int,
const char *, struct nfs_mount_info *);
void nfs_kill_super(struct super_block *);
void nfs_fill_super(struct super_block *, struct nfs_mount_info *);
int nfs_fill_super(struct super_block *, struct nfs_mount_info *);
extern struct rpc_stat nfs_rpcstat;
@ -458,7 +458,7 @@ extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
/* super.c */
void nfs_clone_super(struct super_block *, struct nfs_mount_info *);
int nfs_clone_super(struct super_block *, struct nfs_mount_info *);
void nfs_umount_begin(struct super_block *);
int nfs_statfs(struct dentry *, struct kstatfs *);
int nfs_show_options(struct seq_file *, struct dentry *);

34
fs/nfs/super.c
View File

@ -2315,18 +2315,17 @@ inline void nfs_initialise_sb(struct super_block *sb)
sb->s_blocksize = nfs_block_bits(server->wsize,
&sb->s_blocksize_bits);
sb->s_bdi = &server->backing_dev_info;
nfs_super_set_maxbytes(sb, server->maxfilesize);
}
/*
* Finish setting up an NFS2/3 superblock
*/
void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
int nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
{
struct nfs_parsed_mount_data *data = mount_info->parsed;
struct nfs_server *server = NFS_SB(sb);
int ret;
sb->s_blocksize_bits = 0;
sb->s_blocksize = 0;
@ -2344,13 +2343,21 @@ void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
}
nfs_initialise_sb(sb);
ret = super_setup_bdi_name(sb, "%u:%u", MAJOR(server->s_dev),
MINOR(server->s_dev));
if (ret)
return ret;
sb->s_bdi->ra_pages = server->rpages * NFS_MAX_READAHEAD;
return 0;
}
EXPORT_SYMBOL_GPL(nfs_fill_super);
/*
* Finish setting up a cloned NFS2/3/4 superblock
*/
void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info)
int nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info)
{
const struct super_block *old_sb = mount_info->cloned->sb;
struct nfs_server *server = NFS_SB(sb);
@ -2370,6 +2377,11 @@ void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info)
}
nfs_initialise_sb(sb);
sb->s_bdi = bdi_get(old_sb->s_bdi);
sb->s_iflags |= SB_I_DYNBDI;
return 0;
}
static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
@ -2522,11 +2534,6 @@ static void nfs_get_cache_cookie(struct super_block *sb,
}
#endif
static int nfs_bdi_register(struct nfs_server *server)
{
return bdi_register_dev(&server->backing_dev_info, server->s_dev);
}
int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
struct nfs_mount_info *mount_info)
{
@ -2594,17 +2601,14 @@ struct dentry *nfs_fs_mount_common(struct nfs_server *server,
nfs_free_server(server);
server = NULL;
} else {
error = nfs_bdi_register(server);
if (error) {
mntroot = ERR_PTR(error);
goto error_splat_super;
}
server->super = s;
}
if (!s->s_root) {
/* initial superblock/root creation */
mount_info->fill_super(s, mount_info);
error = mount_info->fill_super(s, mount_info);
if (error)
goto error_splat_super;
nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
}

13
fs/nfs/write.c
View File

@ -263,16 +263,15 @@ int nfs_congestion_kb;
static void nfs_set_page_writeback(struct page *page)
{
struct nfs_server *nfss = NFS_SERVER(page_file_mapping(page)->host);
struct inode *inode = page_file_mapping(page)->host;
struct nfs_server *nfss = NFS_SERVER(inode);
int ret = test_set_page_writeback(page);
WARN_ON_ONCE(ret != 0);
if (atomic_long_inc_return(&nfss->writeback) >
NFS_CONGESTION_ON_THRESH) {
set_bdi_congested(&nfss->backing_dev_info,
BLK_RW_ASYNC);
}
NFS_CONGESTION_ON_THRESH)
set_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC);
}
static void nfs_end_page_writeback(struct nfs_page *req)
@ -285,7 +284,7 @@ static void nfs_end_page_writeback(struct nfs_page *req)
end_page_writeback(req->wb_page);
if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH)
clear_bdi_congested(&nfss->backing_dev_info, BLK_RW_ASYNC);
clear_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC);
}
@ -1808,7 +1807,7 @@ static void nfs_commit_release_pages(struct nfs_commit_data *data)
}
nfss = NFS_SERVER(data->inode);
if (atomic_long_read(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH)
clear_bdi_congested(&nfss->backing_dev_info, BLK_RW_ASYNC);
clear_bdi_congested(inode_to_bdi(data->inode), BLK_RW_ASYNC);
nfs_init_cinfo(&cinfo, data->inode, data->dreq);
nfs_commit_end(cinfo.mds);

1
include/linux/nfs_fs_sb.h
View File

@ -133,7 +133,6 @@ struct nfs_server {
struct rpc_clnt * client_acl; /* ACL RPC client handle */
struct nlm_host *nlm_host; /* NLM client handle */
struct nfs_iostats __percpu *io_stats; /* I/O statistics */
struct backing_dev_info backing_dev_info;
atomic_long_t writeback; /* number of writeback pages */
int flags; /* various flags */
unsigned int caps; /* server capabilities */