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ext2: Convert ext2_unlink() and ext2_rename() to use folios
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:
parent
7e56bbf15d
commit
c2d20492e2
3 changed files with 55 additions and 75 deletions
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@ -209,17 +209,6 @@ static void *ext2_get_folio(struct inode *dir, unsigned long n,
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return ERR_PTR(-EIO);
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}
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static void *ext2_get_page(struct inode *dir, unsigned long n,
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int quiet, struct page **pagep)
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{
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struct folio *folio;
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void *kaddr = ext2_get_folio(dir, n, quiet, &folio);
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if (!IS_ERR(kaddr))
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*pagep = &folio->page;
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return kaddr;
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}
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/*
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* NOTE! unlike strncmp, ext2_match returns 1 for success, 0 for failure.
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*
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@ -342,38 +331,35 @@ ext2_readdir(struct file *file, struct dir_context *ctx)
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* and the entry itself. Page is returned mapped and unlocked.
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* Entry is guaranteed to be valid.
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*
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* On Success ext2_put_page() should be called on *res_page.
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* On Success folio_release_kmap() should be called on *foliop.
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*
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* NOTE: Calls to ext2_get_page()/ext2_put_page() must be nested according to
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* the rules documented in kmap_local_page()/kunmap_local().
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* NOTE: Calls to ext2_get_folio()/folio_release_kmap() must be nested
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* according to the rules documented in kmap_local_folio()/kunmap_local().
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*
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* ext2_find_entry() and ext2_dotdot() act as a call to ext2_get_page() and
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* should be treated as a call to ext2_get_page() for nesting purposes.
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* ext2_find_entry() and ext2_dotdot() act as a call to ext2_get_folio()
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* and should be treated as a call to ext2_get_folio() for nesting
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* purposes.
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*/
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struct ext2_dir_entry_2 *ext2_find_entry (struct inode *dir,
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const struct qstr *child, struct page **res_page)
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const struct qstr *child, struct folio **foliop)
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{
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const char *name = child->name;
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int namelen = child->len;
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unsigned reclen = EXT2_DIR_REC_LEN(namelen);
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unsigned long start, n;
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unsigned long npages = dir_pages(dir);
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struct page *page = NULL;
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struct ext2_inode_info *ei = EXT2_I(dir);
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ext2_dirent * de;
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if (npages == 0)
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goto out;
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/* OFFSET_CACHE */
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*res_page = NULL;
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start = ei->i_dir_start_lookup;
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if (start >= npages)
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start = 0;
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n = start;
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do {
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char *kaddr = ext2_get_page(dir, n, 0, &page);
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char *kaddr = ext2_get_folio(dir, n, 0, foliop);
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if (IS_ERR(kaddr))
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return ERR_CAST(kaddr);
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@ -383,18 +369,18 @@ struct ext2_dir_entry_2 *ext2_find_entry (struct inode *dir,
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if (de->rec_len == 0) {
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ext2_error(dir->i_sb, __func__,
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"zero-length directory entry");
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ext2_put_page(page, de);
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folio_release_kmap(*foliop, de);
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goto out;
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}
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if (ext2_match(namelen, name, de))
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goto found;
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de = ext2_next_entry(de);
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}
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ext2_put_page(page, kaddr);
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folio_release_kmap(*foliop, kaddr);
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if (++n >= npages)
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n = 0;
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/* next page is past the blocks we've got */
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/* next folio is past the blocks we've got */
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if (unlikely(n > (dir->i_blocks >> (PAGE_SHIFT - 9)))) {
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ext2_error(dir->i_sb, __func__,
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"dir %lu size %lld exceeds block count %llu",
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@ -407,7 +393,6 @@ struct ext2_dir_entry_2 *ext2_find_entry (struct inode *dir,
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return ERR_PTR(-ENOENT);
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found:
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*res_page = page;
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ei->i_dir_start_lookup = n;
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return de;
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}
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@ -416,17 +401,18 @@ struct ext2_dir_entry_2 *ext2_find_entry (struct inode *dir,
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* Return the '..' directory entry and the page in which the entry was found
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* (as a parameter - p).
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*
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* On Success ext2_put_page() should be called on *p.
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* On Success folio_release_kmap() should be called on *foliop.
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*
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* NOTE: Calls to ext2_get_page()/ext2_put_page() must be nested according to
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* the rules documented in kmap_local_page()/kunmap_local().
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* NOTE: Calls to ext2_get_folio()/folio_release_kmap() must be nested
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* according to the rules documented in kmap_local_folio()/kunmap_local().
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*
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* ext2_find_entry() and ext2_dotdot() act as a call to ext2_get_page() and
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* should be treated as a call to ext2_get_page() for nesting purposes.
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* ext2_find_entry() and ext2_dotdot() act as a call to ext2_get_folio()
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* and should be treated as a call to ext2_get_folio() for nesting
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* purposes.
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*/
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struct ext2_dir_entry_2 *ext2_dotdot(struct inode *dir, struct page **p)
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struct ext2_dir_entry_2 *ext2_dotdot(struct inode *dir, struct folio **foliop)
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{
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ext2_dirent *de = ext2_get_page(dir, 0, 0, p);
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ext2_dirent *de = ext2_get_folio(dir, 0, 0, foliop);
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if (!IS_ERR(de))
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return ext2_next_entry(de);
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@ -436,14 +422,14 @@ struct ext2_dir_entry_2 *ext2_dotdot(struct inode *dir, struct page **p)
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int ext2_inode_by_name(struct inode *dir, const struct qstr *child, ino_t *ino)
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{
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struct ext2_dir_entry_2 *de;
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struct page *page;
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de = ext2_find_entry(dir, child, &page);
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struct folio *folio;
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de = ext2_find_entry(dir, child, &folio);
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if (IS_ERR(de))
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return PTR_ERR(de);
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*ino = le32_to_cpu(de->inode);
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ext2_put_page(page, de);
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folio_release_kmap(folio, de);
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return 0;
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}
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@ -464,21 +450,21 @@ static int ext2_handle_dirsync(struct inode *dir)
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}
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int ext2_set_link(struct inode *dir, struct ext2_dir_entry_2 *de,
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struct page *page, struct inode *inode, bool update_times)
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struct folio *folio, struct inode *inode, bool update_times)
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{
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loff_t pos = page_offset(page) + offset_in_page(de);
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loff_t pos = folio_pos(folio) + offset_in_folio(folio, de);
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unsigned len = ext2_rec_len_from_disk(de->rec_len);
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int err;
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lock_page(page);
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err = ext2_prepare_chunk(page, pos, len);
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folio_lock(folio);
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err = ext2_prepare_chunk(&folio->page, pos, len);
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if (err) {
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unlock_page(page);
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folio_unlock(folio);
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return err;
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}
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de->inode = cpu_to_le32(inode->i_ino);
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ext2_set_de_type(de, inode);
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ext2_commit_chunk(page, pos, len);
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ext2_commit_chunk(&folio->page, pos, len);
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if (update_times)
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dir->i_mtime = inode_set_ctime_current(dir);
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EXT2_I(dir)->i_flags &= ~EXT2_BTREE_FL;
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@ -584,9 +570,8 @@ int ext2_add_link (struct dentry *dentry, struct inode *inode)
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* ext2_delete_entry deletes a directory entry by merging it with the
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* previous entry. Page is up-to-date.
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*/
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int ext2_delete_entry(struct ext2_dir_entry_2 *dir, struct page *page)
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int ext2_delete_entry(struct ext2_dir_entry_2 *dir, struct folio *folio)
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{
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struct folio *folio = page_folio(page);
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struct inode *inode = folio->mapping->host;
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size_t from, to;
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char *kaddr;
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@ -717,22 +717,17 @@ extern void ext2_init_block_alloc_info(struct inode *);
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extern void ext2_rsv_window_add(struct super_block *sb, struct ext2_reserve_window_node *rsv);
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/* dir.c */
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extern int ext2_add_link (struct dentry *, struct inode *);
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extern int ext2_inode_by_name(struct inode *dir,
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int ext2_add_link(struct dentry *, struct inode *);
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int ext2_inode_by_name(struct inode *dir,
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const struct qstr *child, ino_t *ino);
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extern int ext2_make_empty(struct inode *, struct inode *);
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extern struct ext2_dir_entry_2 *ext2_find_entry(struct inode *, const struct qstr *,
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struct page **);
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extern int ext2_delete_entry(struct ext2_dir_entry_2 *dir, struct page *page);
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extern int ext2_empty_dir (struct inode *);
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extern struct ext2_dir_entry_2 *ext2_dotdot(struct inode *dir, struct page **p);
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int ext2_make_empty(struct inode *, struct inode *);
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struct ext2_dir_entry_2 *ext2_find_entry(struct inode *, const struct qstr *,
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struct folio **foliop);
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int ext2_delete_entry(struct ext2_dir_entry_2 *dir, struct folio *folio);
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int ext2_empty_dir(struct inode *);
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struct ext2_dir_entry_2 *ext2_dotdot(struct inode *dir, struct folio **foliop);
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int ext2_set_link(struct inode *dir, struct ext2_dir_entry_2 *de,
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struct page *page, struct inode *inode, bool update_times);
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static inline void ext2_put_page(struct page *page, void *page_addr)
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{
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kunmap_local(page_addr);
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put_page(page);
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}
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struct folio *folio, struct inode *inode, bool update_times);
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/* ialloc.c */
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extern struct inode * ext2_new_inode (struct inode *, umode_t, const struct qstr *);
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@ -273,21 +273,21 @@ static int ext2_unlink(struct inode *dir, struct dentry *dentry)
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{
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struct inode *inode = d_inode(dentry);
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struct ext2_dir_entry_2 *de;
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struct page *page;
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struct folio *folio;
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int err;
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err = dquot_initialize(dir);
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if (err)
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goto out;
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de = ext2_find_entry(dir, &dentry->d_name, &page);
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de = ext2_find_entry(dir, &dentry->d_name, &folio);
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if (IS_ERR(de)) {
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err = PTR_ERR(de);
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goto out;
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}
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err = ext2_delete_entry(de, page);
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ext2_put_page(page, de);
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err = ext2_delete_entry(de, folio);
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folio_release_kmap(folio, de);
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if (err)
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goto out;
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@ -321,9 +321,9 @@ static int ext2_rename (struct mnt_idmap * idmap,
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{
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struct inode * old_inode = d_inode(old_dentry);
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struct inode * new_inode = d_inode(new_dentry);
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struct page * dir_page = NULL;
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struct folio *dir_folio = NULL;
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struct ext2_dir_entry_2 * dir_de = NULL;
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struct page * old_page;
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struct folio * old_folio;
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struct ext2_dir_entry_2 * old_de;
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int err;
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if (err)
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return err;
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old_de = ext2_find_entry(old_dir, &old_dentry->d_name, &old_page);
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old_de = ext2_find_entry(old_dir, &old_dentry->d_name, &old_folio);
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if (IS_ERR(old_de))
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return PTR_ERR(old_de);
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if (S_ISDIR(old_inode->i_mode)) {
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err = -EIO;
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dir_de = ext2_dotdot(old_inode, &dir_page);
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dir_de = ext2_dotdot(old_inode, &dir_folio);
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if (!dir_de)
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goto out_old;
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}
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if (new_inode) {
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struct page *new_page;
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struct folio *new_folio;
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struct ext2_dir_entry_2 *new_de;
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err = -ENOTEMPTY;
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@ -358,13 +358,13 @@ static int ext2_rename (struct mnt_idmap * idmap,
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goto out_dir;
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new_de = ext2_find_entry(new_dir, &new_dentry->d_name,
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&new_page);
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&new_folio);
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if (IS_ERR(new_de)) {
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err = PTR_ERR(new_de);
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goto out_dir;
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}
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err = ext2_set_link(new_dir, new_de, new_page, old_inode, true);
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ext2_put_page(new_page, new_de);
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err = ext2_set_link(new_dir, new_de, new_folio, old_inode, true);
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folio_release_kmap(new_folio, new_de);
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if (err)
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goto out_dir;
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inode_set_ctime_current(new_inode);
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inode_set_ctime_current(old_inode);
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mark_inode_dirty(old_inode);
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err = ext2_delete_entry(old_de, old_page);
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err = ext2_delete_entry(old_de, old_folio);
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if (!err && dir_de) {
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if (old_dir != new_dir)
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err = ext2_set_link(old_inode, dir_de, dir_page,
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err = ext2_set_link(old_inode, dir_de, dir_folio,
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new_dir, false);
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inode_dec_link_count(old_dir);
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}
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out_dir:
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if (dir_de)
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ext2_put_page(dir_page, dir_de);
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folio_release_kmap(dir_folio, dir_de);
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out_old:
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ext2_put_page(old_page, old_de);
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folio_release_kmap(old_folio, old_de);
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return err;
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}
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