diff options
Diffstat (limited to 'include/linux/fs.h')
| -rw-r--r-- | include/linux/fs.h | 78 |
1 files changed, 69 insertions, 9 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h index 4a6a21077ba..f70d52c4661 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -381,7 +381,7 @@ struct iattr { * trying again. The aop will be taking reasonable * precautions not to livelock. If the caller held a page * reference, it should drop it before retrying. Returned - * by readpage(), prepare_write(), and commit_write(). + * by readpage(). * * address_space_operation functions return these large constants to indicate * special semantics to the caller. These are much larger than the bytes in a @@ -394,6 +394,9 @@ enum positive_aop_returns { AOP_TRUNCATED_PAGE = 0x80001, }; +#define AOP_FLAG_UNINTERRUPTIBLE 0x0001 /* will not do a short write */ +#define AOP_FLAG_CONT_EXPAND 0x0002 /* called from cont_expand */ + /* * oh the beauties of C type declarations. */ @@ -401,6 +404,39 @@ struct page; struct address_space; struct writeback_control; +struct iov_iter { + const struct iovec *iov; + unsigned long nr_segs; + size_t iov_offset; + size_t count; +}; + +size_t iov_iter_copy_from_user_atomic(struct page *page, + struct iov_iter *i, unsigned long offset, size_t bytes); +size_t iov_iter_copy_from_user(struct page *page, + struct iov_iter *i, unsigned long offset, size_t bytes); +void iov_iter_advance(struct iov_iter *i, size_t bytes); +int iov_iter_fault_in_readable(struct iov_iter *i, size_t bytes); +size_t iov_iter_single_seg_count(struct iov_iter *i); + +static inline void iov_iter_init(struct iov_iter *i, + const struct iovec *iov, unsigned long nr_segs, + size_t count, size_t written) +{ + i->iov = iov; + i->nr_segs = nr_segs; + i->iov_offset = 0; + i->count = count + written; + + iov_iter_advance(i, written); +} + +static inline size_t iov_iter_count(struct iov_iter *i) +{ + return i->count; +} + + struct address_space_operations { int (*writepage)(struct page *page, struct writeback_control *wbc); int (*readpage)(struct file *, struct page *); @@ -421,6 +457,14 @@ struct address_space_operations { */ int (*prepare_write)(struct file *, struct page *, unsigned, unsigned); int (*commit_write)(struct file *, struct page *, unsigned, unsigned); + + int (*write_begin)(struct file *, struct address_space *mapping, + loff_t pos, unsigned len, unsigned flags, + struct page **pagep, void **fsdata); + int (*write_end)(struct file *, struct address_space *mapping, + loff_t pos, unsigned len, unsigned copied, + struct page *page, void *fsdata); + /* Unfortunately this kludge is needed for FIBMAP. Don't use it */ sector_t (*bmap)(struct address_space *, sector_t); void (*invalidatepage) (struct page *, unsigned long); @@ -435,6 +479,18 @@ struct address_space_operations { int (*launder_page) (struct page *); }; +/* + * pagecache_write_begin/pagecache_write_end must be used by general code + * to write into the pagecache. + */ +int pagecache_write_begin(struct file *, struct address_space *mapping, + loff_t pos, unsigned len, unsigned flags, + struct page **pagep, void **fsdata); + +int pagecache_write_end(struct file *, struct address_space *mapping, + loff_t pos, unsigned len, unsigned copied, + struct page *page, void *fsdata); + struct backing_dev_info; struct address_space { struct inode *host; /* owner: inode, block_device */ @@ -697,16 +753,14 @@ struct fown_struct { * Track a single file's readahead state */ struct file_ra_state { - pgoff_t start; /* where readahead started */ - unsigned long size; /* # of readahead pages */ - unsigned long async_size; /* do asynchronous readahead when + pgoff_t start; /* where readahead started */ + unsigned int size; /* # of readahead pages */ + unsigned int async_size; /* do asynchronous readahead when there are only # of pages ahead */ - unsigned long ra_pages; /* Maximum readahead window */ - unsigned long mmap_hit; /* Cache hit stat for mmap accesses */ - unsigned long mmap_miss; /* Cache miss stat for mmap accesses */ - unsigned long prev_index; /* Cache last read() position */ - unsigned int prev_offset; /* Offset where last read() ended in a page */ + unsigned int ra_pages; /* Maximum readahead window */ + int mmap_miss; /* Cache miss stat for mmap accesses */ + loff_t prev_pos; /* Cache last read() position */ }; /* @@ -1835,6 +1889,12 @@ extern int simple_prepare_write(struct file *file, struct page *page, unsigned offset, unsigned to); extern int simple_commit_write(struct file *file, struct page *page, unsigned offset, unsigned to); +extern int simple_write_begin(struct file *file, struct address_space *mapping, + loff_t pos, unsigned len, unsigned flags, + struct page **pagep, void **fsdata); +extern int simple_write_end(struct file *file, struct address_space *mapping, + loff_t pos, unsigned len, unsigned copied, + struct page *page, void *fsdata); extern struct dentry *simple_lookup(struct inode *, struct dentry *, struct nameidata *); extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *); |