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kernel
linux-2.6-cachefiles-os-support.patch
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File linux-2.6-cachefiles-os-support.patch of Package kernel
diff --git a/fs/buffer.c b/fs/buffer.c index 3660dcb..31a01da 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -184,6 +184,8 @@ int fsync_super(struct super_block *sb) return sync_blockdev(sb->s_bdev); } +EXPORT_SYMBOL(fsync_super); + /* * Write out and wait upon all dirty data associated with this * device. Filesystem data as well as the underlying block diff --git a/fs/fcntl.c b/fs/fcntl.c index d35cbc6..b43d821 100644 --- a/fs/fcntl.c +++ b/fs/fcntl.c @@ -529,6 +529,8 @@ int send_sigurg(struct fown_struct *fown return ret; } +EXPORT_SYMBOL(send_sigurg); + static DEFINE_RWLOCK(fasync_lock); static kmem_cache_t *fasync_cache __read_mostly; diff --git a/fs/file_table.c b/fs/file_table.c index 0131ba0..47a3fa8 100644 --- a/fs/file_table.c +++ b/fs/file_table.c @@ -234,6 +234,7 @@ struct file fastcall *fget_light(unsigne return file; } +EXPORT_SYMBOL_GPL(fget_light); void put_filp(struct file *file) { diff --git a/include/linux/fs.h b/include/linux/fs.h index 2561020..3cc9657 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -1651,6 +1651,8 @@ extern ssize_t generic_file_direct_write unsigned long *, loff_t, loff_t *, size_t, size_t); extern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *, unsigned long, loff_t, loff_t *, size_t, ssize_t); +extern int generic_file_buffered_write_one_kernel_page(struct address_space *, + pgoff_t, struct page *); extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos); extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos); ssize_t generic_file_write_nolock(struct file *file, const struct iovec *iov, diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index 82b2753..acc3481 100644 --- a/include/linux/pagemap.h +++ b/include/linux/pagemap.h @@ -181,6 +181,12 @@ static inline void wait_on_page_fs_misc( extern void fastcall end_page_fs_misc(struct page *page); /* + * permit installation of a state change monitor in the queue for a page + */ +extern void install_page_waitqueue_monitor(struct page *page, + wait_queue_t *monitor); + +/* * Fault a userspace page into pagetables. Return non-zero on a fault. * * This assumes that two userspace pages are always sufficient. That's diff --git a/kernel/auditsc.c b/kernel/auditsc.c index ae40ac8..61b484f 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -1314,6 +1314,8 @@ #endif context->names[idx].ino = (unsigned long)-1; } +EXPORT_SYMBOL_GPL(__audit_inode_child); + /** * auditsc_get_stamp - get local copies of audit_context values * @ctx: audit_context for the task diff --git a/mm/filemap.c b/mm/filemap.c index c71d8fd..d04f557 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -520,6 +520,18 @@ void fastcall wait_on_page_bit(struct pa } EXPORT_SYMBOL(wait_on_page_bit); +void install_page_waitqueue_monitor(struct page *page, wait_queue_t *monitor) +{ + wait_queue_head_t *q = page_waitqueue(page); + unsigned long flags; + + spin_lock_irqsave(&q->lock, flags); + __add_wait_queue(q, monitor); + spin_unlock_irqrestore(&q->lock, flags); +} + +EXPORT_SYMBOL_GPL(install_page_waitqueue_monitor); + /** * unlock_page - unlock a locked page * @page: the page @@ -2237,6 +2249,92 @@ zero_length_segment: } EXPORT_SYMBOL(generic_file_buffered_write); +/* + * This writes the data from the source page to the specified page offset in + * the nominated file + * - the source page does not need to have any association with the file or the + * page offset + */ +int +generic_file_buffered_write_one_kernel_page(struct address_space *mapping, + pgoff_t index, + struct page *src) +{ + const struct address_space_operations *a_ops = mapping->a_ops; + struct pagevec lru_pvec; + struct page *page, *cached_page = NULL; + long status = 0; + + pagevec_init(&lru_pvec, 0); + +#if 0 + if (mapping->tree_lock.magic != RWLOCK_MAGIC) + printk("RWLOCK magic incorrect: %x != %x\n", + mapping->tree_lock.magic, RWLOCK_MAGIC); +#endif + + page = __grab_cache_page(mapping, index, &cached_page, &lru_pvec); + if (!page) { + BUG_ON(cached_page); + return -ENOMEM; + } + + status = a_ops->prepare_write(NULL, page, 0, PAGE_CACHE_SIZE); + if (unlikely(status)) { + loff_t isize = i_size_read(mapping->host); + + if (status != AOP_TRUNCATED_PAGE) + unlock_page(page); + page_cache_release(page); + if (status == AOP_TRUNCATED_PAGE) + goto sync; + + /* prepare_write() may have instantiated a few blocks outside + * i_size. Trim these off again. + */ + if ((1ULL << (index + 1)) > isize) + vmtruncate(mapping->host, isize); + goto sync; + } + + copy_highpage(page, src); + flush_dcache_page(page); + + status = a_ops->commit_write(NULL, page, 0, PAGE_CACHE_SIZE); + if (status == AOP_TRUNCATED_PAGE) { + page_cache_release(page); + goto sync; + } + + if (status > 0) + status = 0; + + unlock_page(page); + mark_page_accessed(page); + page_cache_release(page); + if (status < 0) + return status; + + balance_dirty_pages_ratelimited(mapping); + cond_resched(); + +sync: + if (cached_page) + page_cache_release(cached_page); + + /* the caller must handle O_SYNC themselves, but we handle S_SYNC and + * MS_SYNCHRONOUS here */ + if (unlikely(IS_SYNC(mapping->host)) && !a_ops->writepage) + status = generic_osync_inode(mapping->host, mapping, + OSYNC_METADATA | OSYNC_DATA); + + /* the caller must handle O_DIRECT for themselves */ + + pagevec_lru_add(&lru_pvec); + return status; +} +EXPORT_SYMBOL(generic_file_buffered_write_one_kernel_page); + static ssize_t __generic_file_aio_write_nolock(struct kiocb *iocb, const struct iovec *iov, unsigned long nr_segs, loff_t *ppos)
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