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nilfs2: return the mapped address from nilfs_get_page() 

[ Upstream commit 09a46acb3697e50548bb265afa1d79163659dd85 ]

In prepartion for switching from kmap() to kmap_local(), return the kmap
address from nilfs_get_page() instead of having the caller look up
page_address().

[konishi.ryusuke: fixed a missing blank line after declaration]
Link: https://lkml.kernel.org/r/20231127143036.2425-7-konishi.ryusuke@gmail.com
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Stable-dep-of: 7373a51e7998 ("nilfs2: fix nilfs_empty_dir() misjudgment and long loop on I/O errors")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2023-11-27 23:30:25 +09:00 committed by Greg Kroah-Hartman
parent 39a143a2b0
commit 8394dce135
1 changed files with 27 additions and 30 deletions
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57
fs/nilfs2/dir.c
View File

@ -186,19 +186,24 @@ fail:
return false;
}
static struct page *nilfs_get_page(struct inode *dir, unsigned long n)
static void *nilfs_get_page(struct inode *dir, unsigned long n,
struct page **pagep)
{
struct address_space *mapping = dir->i_mapping;
struct page *page = read_mapping_page(mapping, n, NULL);
void *kaddr;
if (!IS_ERR(page)) {
kmap(page);
if (unlikely(!PageChecked(page))) {
if (!nilfs_check_page(page))
goto fail;
}
if (IS_ERR(page))
return page;
kaddr = kmap(page);
if (unlikely(!PageChecked(page))) {
if (!nilfs_check_page(page))
goto fail;
}
return page;
*pagep = page;
return kaddr;
fail:
nilfs_put_page(page);
@ -275,14 +280,14 @@ static int nilfs_readdir(struct file *file, struct dir_context *ctx)
for ( ; n < npages; n++, offset = 0) {
char *kaddr, *limit;
struct nilfs_dir_entry *de;
struct page *page = nilfs_get_page(inode, n);
struct page *page;
if (IS_ERR(page)) {
kaddr = nilfs_get_page(inode, n, &page);
if (IS_ERR(kaddr)) {
nilfs_error(sb, "bad page in #%lu", inode->i_ino);
ctx->pos += PAGE_SIZE - offset;
return -EIO;
}
kaddr = page_address(page);
de = (struct nilfs_dir_entry *)(kaddr + offset);
limit = kaddr + nilfs_last_byte(inode, n) -
NILFS_DIR_REC_LEN(1);
@ -345,11 +350,9 @@ nilfs_find_entry(struct inode *dir, const struct qstr *qstr,
start = 0;
n = start;
do {
char *kaddr;
char *kaddr = nilfs_get_page(dir, n, &page);
page = nilfs_get_page(dir, n);
if (!IS_ERR(page)) {
kaddr = page_address(page);
if (!IS_ERR(kaddr)) {
de = (struct nilfs_dir_entry *)kaddr;
kaddr += nilfs_last_byte(dir, n) - reclen;
while ((char *) de <= kaddr) {
@ -387,15 +390,11 @@ found:
struct nilfs_dir_entry *nilfs_dotdot(struct inode *dir, struct page **p)
{
struct page *page = nilfs_get_page(dir, 0);
struct nilfs_dir_entry *de = NULL;
struct nilfs_dir_entry *de = nilfs_get_page(dir, 0, p);
if (!IS_ERR(page)) {
de = nilfs_next_entry(
(struct nilfs_dir_entry *)page_address(page));
*p = page;
}
return de;
if (IS_ERR(de))
return NULL;
return nilfs_next_entry(de);
}
ino_t nilfs_inode_by_name(struct inode *dir, const struct qstr *qstr)
@ -459,12 +458,11 @@ int nilfs_add_link(struct dentry *dentry, struct inode *inode)
for (n = 0; n <= npages; n++) {
char *dir_end;
page = nilfs_get_page(dir, n);
err = PTR_ERR(page);
if (IS_ERR(page))
kaddr = nilfs_get_page(dir, n, &page);
err = PTR_ERR(kaddr);
if (IS_ERR(kaddr))
goto out;
lock_page(page);
kaddr = page_address(page);
dir_end = kaddr + nilfs_last_byte(dir, n);
de = (struct nilfs_dir_entry *)kaddr;
kaddr += PAGE_SIZE - reclen;
@ -627,11 +625,10 @@ int nilfs_empty_dir(struct inode *inode)
char *kaddr;
struct nilfs_dir_entry *de;
page = nilfs_get_page(inode, i);
if (IS_ERR(page))
kaddr = nilfs_get_page(inode, i, &page);
if (IS_ERR(kaddr))
continue;
kaddr = page_address(page);
de = (struct nilfs_dir_entry *)kaddr;
kaddr += nilfs_last_byte(inode, i) - NILFS_DIR_REC_LEN(1);