From: "Matthew Wilcox (Oracle)" <[email protected]>
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 ]
Signed-off-by: Matthew Wilcox (Oracle) <[email protected]>
Signed-off-by: Ryusuke Konishi <[email protected]>
---
fs/nilfs2/dir.c | 57 +++++++++++++++++++++++--------------------------
1 file changed, 27 insertions(+), 30 deletions(-)
diff --git a/fs/nilfs2/dir.c b/fs/nilfs2/dir.c
index 385e47eda99f..45f75d4c4522 100644
--- a/fs/nilfs2/dir.c
+++ b/fs/nilfs2/dir.c
@@ -180,19 +180,24 @@ static bool nilfs_check_page(struct page *page)
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);
@@ -269,14 +274,14 @@ 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);
@@ -339,11 +344,9 @@ 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) {
@@ -381,15 +384,11 @@ nilfs_find_entry(struct inode *dir, const struct qstr *qstr,
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)
@@ -451,12 +450,11 @@ 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;
@@ -618,11 +616,10 @@ 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);
--
2.34.1