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sysv: Convert dir_get_page() to dir_get_folio()

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Remove a few conversions between page and folio.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2024-07-09 09:41:38 -04:00 committed by Christian Brauner
parent 516b97cf03
commit a3b4537f82
No known key found for this signature in database
GPG Key ID: 91C61BC06578DCA2
1 changed files with 42 additions and 38 deletions
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80
fs/sysv/dir.c
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@ -52,20 +52,21 @@ static int sysv_handle_dirsync(struct inode *dir)
}
/*
* Calls to dir_get_page()/unmap_and_put_page() must be nested according to the
* Calls to dir_get_folio()/folio_release_kmap() must be nested according to the
* rules documented in mm/highmem.rst.
*
* NOTE: sysv_find_entry() and sysv_dotdot() act as calls to dir_get_page()
* NOTE: sysv_find_entry() and sysv_dotdot() act as calls to dir_get_folio()
* and must be treated accordingly for nesting purposes.
*/
static void *dir_get_page(struct inode *dir, unsigned long n, struct page **p)
static void *dir_get_folio(struct inode *dir, unsigned long n,
struct folio **foliop)
{
struct address_space *mapping = dir->i_mapping;
struct page *page = read_mapping_page(mapping, n, NULL);
if (IS_ERR(page))
return ERR_CAST(page);
*p = page;
return kmap_local_page(page);
struct folio *folio = read_mapping_folio(dir->i_mapping, n, NULL);
if (IS_ERR(folio))
return ERR_CAST(folio);
*foliop = folio;
return kmap_local_folio(folio, 0);
}
static int sysv_readdir(struct file *file, struct dir_context *ctx)
@ -87,9 +88,9 @@ static int sysv_readdir(struct file *file, struct dir_context *ctx)
for ( ; n < npages; n++, offset = 0) {
char *kaddr, *limit;
struct sysv_dir_entry *de;
struct page *page;
struct folio *folio;
kaddr = dir_get_page(inode, n, &page);
kaddr = dir_get_folio(inode, n, &folio);
if (IS_ERR(kaddr))
continue;
de = (struct sysv_dir_entry *)(kaddr+offset);
@ -103,11 +104,11 @@ static int sysv_readdir(struct file *file, struct dir_context *ctx)
if (!dir_emit(ctx, name, strnlen(name,SYSV_NAMELEN),
fs16_to_cpu(SYSV_SB(sb), de->inode),
DT_UNKNOWN)) {
unmap_and_put_page(page, kaddr);
folio_release_kmap(folio, kaddr);
return 0;
}
}
unmap_and_put_page(page, kaddr);
folio_release_kmap(folio, kaddr);
}
return 0;
}
@ -133,7 +134,7 @@ static inline int namecompare(int len, int maxlen,
*
* On Success unmap_and_put_page() should be called on *res_page.
*
* sysv_find_entry() acts as a call to dir_get_page() and must be treated
* sysv_find_entry() acts as a call to dir_get_folio() and must be treated
* accordingly for nesting purposes.
*/
struct sysv_dir_entry *sysv_find_entry(struct dentry *dentry, struct page **res_page)
@ -143,7 +144,7 @@ struct sysv_dir_entry *sysv_find_entry(struct dentry *dentry, struct page **res_
struct inode * dir = d_inode(dentry->d_parent);
unsigned long start, n;
unsigned long npages = dir_pages(dir);
struct page *page = NULL;
struct folio *folio = NULL;
struct sysv_dir_entry *de;
*res_page = NULL;
@ -154,7 +155,7 @@ struct sysv_dir_entry *sysv_find_entry(struct dentry *dentry, struct page **res_
n = start;
do {
char *kaddr = dir_get_page(dir, n, &page);
char *kaddr = dir_get_folio(dir, n, &folio);
if (!IS_ERR(kaddr)) {
de = (struct sysv_dir_entry *)kaddr;
@ -166,7 +167,7 @@ struct sysv_dir_entry *sysv_find_entry(struct dentry *dentry, struct page **res_
name, de->name))
goto found;
}
unmap_and_put_page(page, kaddr);
folio_release_kmap(folio, kaddr);
}
if (++n >= npages)
@ -177,7 +178,7 @@ struct sysv_dir_entry *sysv_find_entry(struct dentry *dentry, struct page **res_
found:
SYSV_I(dir)->i_dir_start_lookup = n;
*res_page = page;
*res_page = &folio->page;
return de;
}
@ -186,7 +187,7 @@ int sysv_add_link(struct dentry *dentry, struct inode *inode)
struct inode *dir = d_inode(dentry->d_parent);
const char * name = dentry->d_name.name;
int namelen = dentry->d_name.len;
struct page *page = NULL;
struct folio *folio = NULL;
struct sysv_dir_entry * de;
unsigned long npages = dir_pages(dir);
unsigned long n;
@ -196,7 +197,7 @@ int sysv_add_link(struct dentry *dentry, struct inode *inode)
/* We take care of directory expansion in the same loop */
for (n = 0; n <= npages; n++) {
kaddr = dir_get_page(dir, n, &page);
kaddr = dir_get_folio(dir, n, &folio);
if (IS_ERR(kaddr))
return PTR_ERR(kaddr);
de = (struct sysv_dir_entry *)kaddr;
@ -206,33 +207,33 @@ int sysv_add_link(struct dentry *dentry, struct inode *inode)
goto got_it;
err = -EEXIST;
if (namecompare(namelen, SYSV_NAMELEN, name, de->name))
goto out_page;
goto out_folio;
de++;
}
unmap_and_put_page(page, kaddr);
folio_release_kmap(folio, kaddr);
}
BUG();
return -EINVAL;
got_it:
pos = page_offset(page) + offset_in_page(de);
lock_page(page);
err = sysv_prepare_chunk(page, pos, SYSV_DIRSIZE);
pos = folio_pos(folio) + offset_in_folio(folio, de);
folio_lock(folio);
err = sysv_prepare_chunk(&folio->page, pos, SYSV_DIRSIZE);
if (err)
goto out_unlock;
memcpy (de->name, name, namelen);
memset (de->name + namelen, 0, SYSV_DIRSIZE - namelen - 2);
de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), inode->i_ino);
dir_commit_chunk(page, pos, SYSV_DIRSIZE);
dir_commit_chunk(&folio->page, pos, SYSV_DIRSIZE);
inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
mark_inode_dirty(dir);
err = sysv_handle_dirsync(dir);
out_page:
unmap_and_put_page(page, kaddr);
out_folio:
folio_release_kmap(folio, kaddr);
return err;
out_unlock:
unlock_page(page);
goto out_page;
folio_unlock(folio);
goto out_folio;
}
int sysv_delete_entry(struct sysv_dir_entry *de, struct page *page)
@ -292,19 +293,19 @@ fail:
int sysv_empty_dir(struct inode * inode)
{
struct super_block *sb = inode->i_sb;
struct page *page = NULL;
struct folio *folio = NULL;
unsigned long i, npages = dir_pages(inode);
char *kaddr;
for (i = 0; i < npages; i++) {
struct sysv_dir_entry *de;
kaddr = dir_get_page(inode, i, &page);
kaddr = dir_get_folio(inode, i, &folio);
if (IS_ERR(kaddr))
continue;
de = (struct sysv_dir_entry *)kaddr;
kaddr += PAGE_SIZE-SYSV_DIRSIZE;
kaddr += folio_size(folio) - SYSV_DIRSIZE;
for ( ;(char *)de <= kaddr; de++) {
if (!de->inode)
@ -321,12 +322,12 @@ int sysv_empty_dir(struct inode * inode)
if (de->name[1] != '.' || de->name[2])
goto not_empty;
}
unmap_and_put_page(page, kaddr);
folio_release_kmap(folio, kaddr);
}
return 1;
not_empty:
unmap_and_put_page(page, kaddr);
folio_release_kmap(folio, kaddr);
return 0;
}
@ -352,18 +353,21 @@ int sysv_set_link(struct sysv_dir_entry *de, struct page *page,
}
/*
* Calls to dir_get_page()/unmap_and_put_page() must be nested according to the
* Calls to dir_get_folio()/folio_release_kmap() must be nested according to the
* rules documented in mm/highmem.rst.
*
* sysv_dotdot() acts as a call to dir_get_page() and must be treated
* sysv_dotdot() acts as a call to dir_get_folio() and must be treated
* accordingly for nesting purposes.
*/
struct sysv_dir_entry *sysv_dotdot(struct inode *dir, struct page **p)
{
struct sysv_dir_entry *de = dir_get_page(dir, 0, p);
struct folio *folio;
struct sysv_dir_entry *de = dir_get_folio(dir, 0, &folio);
if (IS_ERR(de))
return NULL;
*p = &folio->page;
/* ".." is the second directory entry */
return de + 1;
}