diff options
Diffstat (limited to 'fs/libfs.c')
| -rw-r--r-- | fs/libfs.c | 89 |
1 files changed, 62 insertions, 27 deletions
diff --git a/fs/libfs.c b/fs/libfs.c index ba7438ab9371..682d56345a1c 100644 --- a/fs/libfs.c +++ b/fs/libfs.c @@ -15,6 +15,7 @@ #include <linux/mutex.h> #include <linux/namei.h> #include <linux/exportfs.h> +#include <linux/iversion.h> #include <linux/writeback.h> #include <linux/buffer_head.h> /* sync_mapping_buffers */ #include <linux/fs_context.h> @@ -539,17 +540,17 @@ int simple_setattr(struct user_namespace *mnt_userns, struct dentry *dentry, } EXPORT_SYMBOL(simple_setattr); -static int simple_readpage(struct file *file, struct page *page) +static int simple_read_folio(struct file *file, struct folio *folio) { - clear_highpage(page); - flush_dcache_page(page); - SetPageUptodate(page); - unlock_page(page); + folio_zero_range(folio, 0, folio_size(folio)); + flush_dcache_folio(folio); + folio_mark_uptodate(folio); + folio_unlock(folio); return 0; } int simple_write_begin(struct file *file, struct address_space *mapping, - loff_t pos, unsigned len, unsigned flags, + loff_t pos, unsigned len, struct page **pagep, void **fsdata) { struct page *page; @@ -557,7 +558,7 @@ int simple_write_begin(struct file *file, struct address_space *mapping, index = pos >> PAGE_SHIFT; - page = grab_cache_page_write_begin(mapping, index, flags); + page = grab_cache_page_write_begin(mapping, index); if (!page) return -ENOMEM; @@ -592,7 +593,7 @@ EXPORT_SYMBOL(simple_write_begin); * should extend on what's done here with a call to mark_inode_dirty() in the * case that i_size has changed. * - * Use *ONLY* with simple_readpage() + * Use *ONLY* with simple_read_folio() */ static int simple_write_end(struct file *file, struct address_space *mapping, loff_t pos, unsigned len, unsigned copied, @@ -628,10 +629,10 @@ static int simple_write_end(struct file *file, struct address_space *mapping, * Provides ramfs-style behavior: data in the pagecache, but no writeback. */ const struct address_space_operations ram_aops = { - .readpage = simple_readpage, + .read_folio = simple_read_folio, .write_begin = simple_write_begin, .write_end = simple_write_end, - .set_page_dirty = __set_page_dirty_no_writeback, + .dirty_folio = noop_dirty_folio, }; EXPORT_SYMBOL(ram_aops); @@ -1198,17 +1199,6 @@ int noop_fsync(struct file *file, loff_t start, loff_t end, int datasync) } EXPORT_SYMBOL(noop_fsync); -void noop_invalidatepage(struct page *page, unsigned int offset, - unsigned int length) -{ - /* - * There is no page cache to invalidate in the dax case, however - * we need this callback defined to prevent falling back to - * block_invalidatepage() in do_invalidatepage(). - */ -} -EXPORT_SYMBOL_GPL(noop_invalidatepage); - ssize_t noop_direct_IO(struct kiocb *iocb, struct iov_iter *iter) { /* @@ -1231,7 +1221,7 @@ EXPORT_SYMBOL(kfree_link); struct inode *alloc_anon_inode(struct super_block *s) { static const struct address_space_operations anon_aops = { - .set_page_dirty = __set_page_dirty_no_writeback, + .dirty_folio = noop_dirty_folio, }; struct inode *inode = new_inode_pseudo(s); @@ -1379,7 +1369,7 @@ bool is_empty_dir_inode(struct inode *inode) (inode->i_op == &empty_dir_inode_operations); } -#ifdef CONFIG_UNICODE +#if IS_ENABLED(CONFIG_UNICODE) /* * Determine if the name of a dentry should be casefolded. * @@ -1473,7 +1463,7 @@ static const struct dentry_operations generic_encrypted_dentry_ops = { }; #endif -#if defined(CONFIG_FS_ENCRYPTION) && defined(CONFIG_UNICODE) +#if defined(CONFIG_FS_ENCRYPTION) && IS_ENABLED(CONFIG_UNICODE) static const struct dentry_operations generic_encrypted_ci_dentry_ops = { .d_hash = generic_ci_d_hash, .d_compare = generic_ci_d_compare, @@ -1508,10 +1498,10 @@ void generic_set_encrypted_ci_d_ops(struct dentry *dentry) #ifdef CONFIG_FS_ENCRYPTION bool needs_encrypt_ops = dentry->d_flags & DCACHE_NOKEY_NAME; #endif -#ifdef CONFIG_UNICODE +#if IS_ENABLED(CONFIG_UNICODE) bool needs_ci_ops = dentry->d_sb->s_encoding; #endif -#if defined(CONFIG_FS_ENCRYPTION) && defined(CONFIG_UNICODE) +#if defined(CONFIG_FS_ENCRYPTION) && IS_ENABLED(CONFIG_UNICODE) if (needs_encrypt_ops && needs_ci_ops) { d_set_d_op(dentry, &generic_encrypted_ci_dentry_ops); return; @@ -1523,7 +1513,7 @@ void generic_set_encrypted_ci_d_ops(struct dentry *dentry) return; } #endif -#ifdef CONFIG_UNICODE +#if IS_ENABLED(CONFIG_UNICODE) if (needs_ci_ops) { d_set_d_op(dentry, &generic_ci_dentry_ops); return; @@ -1531,3 +1521,48 @@ void generic_set_encrypted_ci_d_ops(struct dentry *dentry) #endif } EXPORT_SYMBOL(generic_set_encrypted_ci_d_ops); + +/** + * inode_maybe_inc_iversion - increments i_version + * @inode: inode with the i_version that should be updated + * @force: increment the counter even if it's not necessary? + * + * Every time the inode is modified, the i_version field must be seen to have + * changed by any observer. + * + * If "force" is set or the QUERIED flag is set, then ensure that we increment + * the value, and clear the queried flag. + * + * In the common case where neither is set, then we can return "false" without + * updating i_version. + * + * If this function returns false, and no other metadata has changed, then we + * can avoid logging the metadata. + */ +bool inode_maybe_inc_iversion(struct inode *inode, bool force) +{ + u64 cur, new; + + /* + * The i_version field is not strictly ordered with any other inode + * information, but the legacy inode_inc_iversion code used a spinlock + * to serialize increments. + * + * Here, we add full memory barriers to ensure that any de-facto + * ordering with other info is preserved. + * + * This barrier pairs with the barrier in inode_query_iversion() + */ + smp_mb(); + cur = inode_peek_iversion_raw(inode); + do { + /* If flag is clear then we needn't do anything */ + if (!force && !(cur & I_VERSION_QUERIED)) + return false; + + /* Since lowest bit is flag, add 2 to avoid it */ + new = (cur & ~I_VERSION_QUERIED) + I_VERSION_INCREMENT; + } while (!atomic64_try_cmpxchg(&inode->i_version, &cur, new)); + return true; +} +EXPORT_SYMBOL(inode_maybe_inc_iversion); |