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Code Issues Releases Wiki Activity

ext2: Convert ext2_unlink() and ext2_rename() to use folios

Browse source 
This involves changing ext2_find_entry(), ext2_dotdot(),
ext2_inode_by_name(), ext2_set_link() and ext2_delete_entry() to
take a folio.  These were also the last users of ext2_get_page() and
ext2_put_page(), so remove those at the same time.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Jan Kara <jack@suse.cz>
Message-Id: <20230921200746.3303942-8-willy@infradead.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2023-09-21 21:07:45 +01:00 committed by Jan Kara
parent 7e56bbf15d
commit c2d20492e2
3 changed files with 55 additions and 75 deletions
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75
fs/ext2/dir.c
View file

@ -209,17 +209,6 @@ static void *ext2_get_folio(struct inode *dir, unsigned long n,
return ERR_PTR(-EIO);
}
static void *ext2_get_page(struct inode *dir, unsigned long n,
int quiet, struct page **pagep)
{
struct folio *folio;
void *kaddr = ext2_get_folio(dir, n, quiet, &folio);
if (!IS_ERR(kaddr))
*pagep = &folio->page;
return kaddr;
}
/*
* NOTE! unlike strncmp, ext2_match returns 1 for success, 0 for failure.
*
@ -342,38 +331,35 @@ ext2_readdir(struct file *file, struct dir_context *ctx)
* and the entry itself. Page is returned mapped and unlocked.
* Entry is guaranteed to be valid.
*
* On Success ext2_put_page() should be called on *res_page.
* On Success folio_release_kmap() should be called on *foliop.
*
* NOTE: Calls to ext2_get_page()/ext2_put_page() must be nested according to
* the rules documented in kmap_local_page()/kunmap_local().
* NOTE: Calls to ext2_get_folio()/folio_release_kmap() must be nested
* according to the rules documented in kmap_local_folio()/kunmap_local().
*
* ext2_find_entry() and ext2_dotdot() act as a call to ext2_get_page() and
* should be treated as a call to ext2_get_page() for nesting purposes.
* ext2_find_entry() and ext2_dotdot() act as a call to ext2_get_folio()
* and should be treated as a call to ext2_get_folio() for nesting
* purposes.
*/
struct ext2_dir_entry_2 *ext2_find_entry (struct inode *dir,
const struct qstr *child, struct page **res_page)
const struct qstr *child, struct folio **foliop)
{
const char *name = child->name;
int namelen = child->len;
unsigned reclen = EXT2_DIR_REC_LEN(namelen);
unsigned long start, n;
unsigned long npages = dir_pages(dir);
struct page *page = NULL;
struct ext2_inode_info *ei = EXT2_I(dir);
ext2_dirent * de;
if (npages == 0)
goto out;
/* OFFSET_CACHE */
*res_page = NULL;
start = ei->i_dir_start_lookup;
if (start >= npages)
start = 0;
n = start;
do {
char *kaddr = ext2_get_page(dir, n, 0, &page);
char *kaddr = ext2_get_folio(dir, n, 0, foliop);
if (IS_ERR(kaddr))
return ERR_CAST(kaddr);
@ -383,18 +369,18 @@ struct ext2_dir_entry_2 *ext2_find_entry (struct inode *dir,
if (de->rec_len == 0) {
ext2_error(dir->i_sb, __func__,
"zero-length directory entry");
ext2_put_page(page, de);
folio_release_kmap(*foliop, de);
goto out;
}
if (ext2_match(namelen, name, de))
goto found;
de = ext2_next_entry(de);
}
ext2_put_page(page, kaddr);
folio_release_kmap(*foliop, kaddr);
if (++n >= npages)
n = 0;
/* next page is past the blocks we've got */
/* next folio is past the blocks we've got */
if (unlikely(n > (dir->i_blocks >> (PAGE_SHIFT - 9)))) {
ext2_error(dir->i_sb, __func__,
"dir %lu size %lld exceeds block count %llu",
@ -407,7 +393,6 @@ struct ext2_dir_entry_2 *ext2_find_entry (struct inode *dir,
return ERR_PTR(-ENOENT);
found:
*res_page = page;
ei->i_dir_start_lookup = n;
return de;
}
@ -416,17 +401,18 @@ struct ext2_dir_entry_2 *ext2_find_entry (struct inode *dir,
* Return the '..' directory entry and the page in which the entry was found
* (as a parameter - p).
*
* On Success ext2_put_page() should be called on *p.
* On Success folio_release_kmap() should be called on *foliop.
*
* NOTE: Calls to ext2_get_page()/ext2_put_page() must be nested according to
* the rules documented in kmap_local_page()/kunmap_local().
* NOTE: Calls to ext2_get_folio()/folio_release_kmap() must be nested
* according to the rules documented in kmap_local_folio()/kunmap_local().
*
* ext2_find_entry() and ext2_dotdot() act as a call to ext2_get_page() and
* should be treated as a call to ext2_get_page() for nesting purposes.
* ext2_find_entry() and ext2_dotdot() act as a call to ext2_get_folio()
* and should be treated as a call to ext2_get_folio() for nesting
* purposes.
*/
struct ext2_dir_entry_2 *ext2_dotdot(struct inode *dir, struct page **p)
struct ext2_dir_entry_2 *ext2_dotdot(struct inode *dir, struct folio **foliop)
{
ext2_dirent *de = ext2_get_page(dir, 0, 0, p);
ext2_dirent *de = ext2_get_folio(dir, 0, 0, foliop);
if (!IS_ERR(de))
return ext2_next_entry(de);
@ -436,14 +422,14 @@ struct ext2_dir_entry_2 *ext2_dotdot(struct inode *dir, struct page **p)
int ext2_inode_by_name(struct inode *dir, const struct qstr *child, ino_t *ino)
{
struct ext2_dir_entry_2 *de;
struct page *page;
de = ext2_find_entry(dir, child, &page);
struct folio *folio;
de = ext2_find_entry(dir, child, &folio);
if (IS_ERR(de))
return PTR_ERR(de);
*ino = le32_to_cpu(de->inode);
ext2_put_page(page, de);
folio_release_kmap(folio, de);
return 0;
}
@ -464,21 +450,21 @@ static int ext2_handle_dirsync(struct inode *dir)
}
int ext2_set_link(struct inode *dir, struct ext2_dir_entry_2 *de,
struct page *page, struct inode *inode, bool update_times)
struct folio *folio, struct inode *inode, bool update_times)
{
loff_t pos = page_offset(page) + offset_in_page(de);
loff_t pos = folio_pos(folio) + offset_in_folio(folio, de);
unsigned len = ext2_rec_len_from_disk(de->rec_len);
int err;
lock_page(page);
err = ext2_prepare_chunk(page, pos, len);
folio_lock(folio);
err = ext2_prepare_chunk(&folio->page, pos, len);
if (err) {
unlock_page(page);
folio_unlock(folio);
return err;
}
de->inode = cpu_to_le32(inode->i_ino);
ext2_set_de_type(de, inode);
ext2_commit_chunk(page, pos, len);
ext2_commit_chunk(&folio->page, pos, len);
if (update_times)
dir->i_mtime = inode_set_ctime_current(dir);
EXT2_I(dir)->i_flags &= ~EXT2_BTREE_FL;
@ -584,9 +570,8 @@ int ext2_add_link (struct dentry *dentry, struct inode *inode)
* ext2_delete_entry deletes a directory entry by merging it with the
* previous entry. Page is up-to-date.
*/
int ext2_delete_entry(struct ext2_dir_entry_2 *dir, struct page *page)
int ext2_delete_entry(struct ext2_dir_entry_2 *dir, struct folio *folio)
{
struct folio *folio = page_folio(page);
struct inode *inode = folio->mapping->host;
size_t from, to;
char *kaddr;

23
fs/ext2/ext2.h
View file

@ -717,22 +717,17 @@ extern void ext2_init_block_alloc_info(struct inode *);
extern void ext2_rsv_window_add(struct super_block *sb, struct ext2_reserve_window_node *rsv);
/* dir.c */
extern int ext2_add_link (struct dentry *, struct inode *);
extern int ext2_inode_by_name(struct inode *dir,
int ext2_add_link(struct dentry *, struct inode *);
int ext2_inode_by_name(struct inode *dir,
const struct qstr *child, ino_t *ino);
extern int ext2_make_empty(struct inode *, struct inode *);
extern struct ext2_dir_entry_2 *ext2_find_entry(struct inode *, const struct qstr *,
struct page **);
extern int ext2_delete_entry(struct ext2_dir_entry_2 *dir, struct page *page);
extern int ext2_empty_dir (struct inode *);
extern struct ext2_dir_entry_2 *ext2_dotdot(struct inode *dir, struct page **p);
int ext2_make_empty(struct inode *, struct inode *);
struct ext2_dir_entry_2 *ext2_find_entry(struct inode *, const struct qstr *,
struct folio **foliop);
int ext2_delete_entry(struct ext2_dir_entry_2 *dir, struct folio *folio);
int ext2_empty_dir(struct inode *);
struct ext2_dir_entry_2 *ext2_dotdot(struct inode *dir, struct folio **foliop);
int ext2_set_link(struct inode *dir, struct ext2_dir_entry_2 *de,
struct page *page, struct inode *inode, bool update_times);
static inline void ext2_put_page(struct page *page, void *page_addr)
{
kunmap_local(page_addr);
put_page(page);
}
struct folio *folio, struct inode *inode, bool update_times);
/* ialloc.c */
extern struct inode * ext2_new_inode (struct inode *, umode_t, const struct qstr *);

32
fs/ext2/namei.c
View file

@ -273,21 +273,21 @@ static int ext2_unlink(struct inode *dir, struct dentry *dentry)
{
struct inode *inode = d_inode(dentry);
struct ext2_dir_entry_2 *de;
struct page *page;
struct folio *folio;
int err;
err = dquot_initialize(dir);
if (err)
goto out;
de = ext2_find_entry(dir, &dentry->d_name, &page);
de = ext2_find_entry(dir, &dentry->d_name, &folio);
if (IS_ERR(de)) {
err = PTR_ERR(de);
goto out;
}
err = ext2_delete_entry(de, page);
ext2_put_page(page, de);
err = ext2_delete_entry(de, folio);
folio_release_kmap(folio, de);
if (err)
goto out;
@ -321,9 +321,9 @@ static int ext2_rename (struct mnt_idmap * idmap,
{
struct inode * old_inode = d_inode(old_dentry);
struct inode * new_inode = d_inode(new_dentry);
struct page * dir_page = NULL;
struct folio *dir_folio = NULL;
struct ext2_dir_entry_2 * dir_de = NULL;
struct page * old_page;
struct folio * old_folio;
struct ext2_dir_entry_2 * old_de;
int err;
@ -338,19 +338,19 @@ static int ext2_rename (struct mnt_idmap * idmap,
if (err)
return err;
old_de = ext2_find_entry(old_dir, &old_dentry->d_name, &old_page);
old_de = ext2_find_entry(old_dir, &old_dentry->d_name, &old_folio);
if (IS_ERR(old_de))
return PTR_ERR(old_de);
if (S_ISDIR(old_inode->i_mode)) {
err = -EIO;
dir_de = ext2_dotdot(old_inode, &dir_page);
dir_de = ext2_dotdot(old_inode, &dir_folio);
if (!dir_de)
goto out_old;
}
if (new_inode) {
struct page *new_page;
struct folio *new_folio;
struct ext2_dir_entry_2 *new_de;
err = -ENOTEMPTY;
@ -358,13 +358,13 @@ static int ext2_rename (struct mnt_idmap * idmap,
goto out_dir;
new_de = ext2_find_entry(new_dir, &new_dentry->d_name,
&new_page);
&new_folio);
if (IS_ERR(new_de)) {
err = PTR_ERR(new_de);
goto out_dir;
}
err = ext2_set_link(new_dir, new_de, new_page, old_inode, true);
ext2_put_page(new_page, new_de);
err = ext2_set_link(new_dir, new_de, new_folio, old_inode, true);
folio_release_kmap(new_folio, new_de);
if (err)
goto out_dir;
inode_set_ctime_current(new_inode);
@ -386,19 +386,19 @@ static int ext2_rename (struct mnt_idmap * idmap,
inode_set_ctime_current(old_inode);
mark_inode_dirty(old_inode);
err = ext2_delete_entry(old_de, old_page);
err = ext2_delete_entry(old_de, old_folio);
if (!err && dir_de) {
if (old_dir != new_dir)
err = ext2_set_link(old_inode, dir_de, dir_page,
err = ext2_set_link(old_inode, dir_de, dir_folio,
new_dir, false);
inode_dec_link_count(old_dir);
}
out_dir:
if (dir_de)
ext2_put_page(dir_page, dir_de);
folio_release_kmap(dir_folio, dir_de);
out_old:
ext2_put_page(old_page, old_de);
folio_release_kmap(old_folio, old_de);
return err;
}