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nfs: Convert nfs_symlink() to use a folio 

Use the folio APIs, saving about four calls to compound_head().
Convert back to a page in each of the individual protocol implementations.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Matthew Wilcox (Oracle) 2023-09-15 18:33:33 +01:00 committed by Trond Myklebust
parent bfca5fb4e9
commit f003a717ae
5 changed files with 21 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
fs/nfs/dir.c
View File

@ -2532,7 +2532,7 @@ EXPORT_SYMBOL_GPL(nfs_unlink);
int nfs_symlink(struct mnt_idmap *idmap, struct inode *dir,
struct dentry *dentry, const char *symname)
{
struct page *page;
struct folio *folio;
char *kaddr;
struct iattr attr;
unsigned int pathlen = strlen(symname);
@ -2547,24 +2547,24 @@ int nfs_symlink(struct mnt_idmap *idmap, struct inode *dir,
attr.ia_mode = S_IFLNK | S_IRWXUGO;
attr.ia_valid = ATTR_MODE;
page = alloc_page(GFP_USER);
if (!page)
folio = folio_alloc(GFP_USER, 0);
if (!folio)
return -ENOMEM;
kaddr = page_address(page);
kaddr = folio_address(folio);
memcpy(kaddr, symname, pathlen);
if (pathlen < PAGE_SIZE)
memset(kaddr + pathlen, 0, PAGE_SIZE - pathlen);
trace_nfs_symlink_enter(dir, dentry);
error = NFS_PROTO(dir)->symlink(dir, dentry, page, pathlen, &attr);
error = NFS_PROTO(dir)->symlink(dir, dentry, folio, pathlen, &attr);
trace_nfs_symlink_exit(dir, dentry, error);
if (error != 0) {
dfprintk(VFS, "NFS: symlink(%s/%lu, %pd, %s) error %d\n",
dir->i_sb->s_id, dir->i_ino,
dentry, symname, error);
d_drop(dentry);
__free_page(page);
folio_put(folio);
return error;
}
@ -2574,18 +2574,13 @@ int nfs_symlink(struct mnt_idmap *idmap, struct inode *dir,
* No big deal if we can't add this page to the page cache here.
* READLINK will get the missing page from the server if needed.
*/
if (!add_to_page_cache_lru(page, d_inode(dentry)->i_mapping, 0,
GFP_KERNEL)) {
SetPageUptodate(page);
unlock_page(page);
/*
* add_to_page_cache_lru() grabs an extra page refcount.
* Drop it here to avoid leaking this page later.
*/
put_page(page);
} else
__free_page(page);
if (filemap_add_folio(d_inode(dentry)->i_mapping, folio, 0,
GFP_KERNEL) == 0) {
folio_mark_uptodate(folio);
folio_unlock(folio);
}
folio_put(folio);
return 0;
}
EXPORT_SYMBOL_GPL(nfs_symlink);

3
fs/nfs/nfs3proc.c
View File

@ -543,9 +543,10 @@ out:
}
static int
nfs3_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page,
nfs3_proc_symlink(struct inode *dir, struct dentry *dentry, struct folio *folio,
unsigned int len, struct iattr *sattr)
{
struct page *page = &folio->page;
struct nfs3_createdata *data;
struct dentry *d_alias;
int status = -ENOMEM;

7
fs/nfs/nfs4proc.c
View File

@ -5036,9 +5036,10 @@ static void nfs4_free_createdata(struct nfs4_createdata *data)
}
static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
struct page *page, unsigned int len, struct iattr *sattr,
struct folio *folio, unsigned int len, struct iattr *sattr,
struct nfs4_label *label)
{
struct page *page = &folio->page;
struct nfs4_createdata *data;
int status = -ENAMETOOLONG;
@ -5063,7 +5064,7 @@ out:
}
static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
struct page *page, unsigned int len, struct iattr *sattr)
struct folio *folio, unsigned int len, struct iattr *sattr)
{
struct nfs4_exception exception = {
.interruptible = true,
@ -5074,7 +5075,7 @@ static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
label = nfs4_label_init_security(dir, dentry, sattr, &l);
do {
err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
err = _nfs4_proc_symlink(dir, dentry, folio, len, sattr, label);
trace_nfs4_symlink(dir, &dentry->d_name, err);
err = nfs4_handle_exception(NFS_SERVER(dir), err,
&exception);

3
fs/nfs/proc.c
View File

@ -396,9 +396,10 @@ nfs_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
}
static int
nfs_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page,
nfs_proc_symlink(struct inode *dir, struct dentry *dentry, struct folio *folio,
unsigned int len, struct iattr *sattr)
{
struct page *page = &folio->page;
struct nfs_fh *fh;
struct nfs_fattr *fattr;
struct nfs_symlinkargs arg = {

2
include/linux/nfs_xdr.h
View File

@ -1772,7 +1772,7 @@ struct nfs_rpc_ops {
void (*rename_rpc_prepare)(struct rpc_task *task, struct nfs_renamedata *);
int (*rename_done) (struct rpc_task *task, struct inode *old_dir, struct inode *new_dir);
int (*link) (struct inode *, struct inode *, const struct qstr *);
int (*symlink) (struct inode *, struct dentry *, struct page *,
int (*symlink) (struct inode *, struct dentry *, struct folio *,
unsigned int, struct iattr *);
int (*mkdir) (struct inode *, struct dentry *, struct iattr *);
int (*rmdir) (struct inode *, const struct qstr *);