diff options
Diffstat (limited to 'mm/shmem.c')
| -rw-r--r-- | mm/shmem.c | 34 |
1 files changed, 27 insertions, 7 deletions
diff --git a/mm/shmem.c b/mm/shmem.c index 2c39925fe073..131f2938f3ad 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -1108,7 +1108,7 @@ static int shmem_getpage(struct inode *inode, unsigned long idx, * Normally, filepage is NULL on entry, and either found * uptodate immediately, or allocated and zeroed, or read * in under swappage, which is then assigned to filepage. - * But shmem_readpage and shmem_prepare_write pass in a locked + * But shmem_readpage and shmem_write_begin pass in a locked * filepage, which may be found not uptodate by other callers * too, and may need to be copied from the swappage read in. */ @@ -1445,7 +1445,7 @@ static const struct inode_operations shmem_symlink_inode_operations; static const struct inode_operations shmem_symlink_inline_operations; /* - * Normally tmpfs avoids the use of shmem_readpage and shmem_prepare_write; + * Normally tmpfs avoids the use of shmem_readpage and shmem_write_begin; * but providing them allows a tmpfs file to be used for splice, sendfile, and * below the loop driver, in the generic fashion that many filesystems support. */ @@ -1458,10 +1458,30 @@ static int shmem_readpage(struct file *file, struct page *page) } static int -shmem_prepare_write(struct file *file, struct page *page, unsigned offset, unsigned to) +shmem_write_begin(struct file *file, struct address_space *mapping, + loff_t pos, unsigned len, unsigned flags, + struct page **pagep, void **fsdata) { - struct inode *inode = page->mapping->host; - return shmem_getpage(inode, page->index, &page, SGP_WRITE, NULL); + struct inode *inode = mapping->host; + pgoff_t index = pos >> PAGE_CACHE_SHIFT; + *pagep = NULL; + return shmem_getpage(inode, index, pagep, SGP_WRITE, NULL); +} + +static int +shmem_write_end(struct file *file, struct address_space *mapping, + loff_t pos, unsigned len, unsigned copied, + struct page *page, void *fsdata) +{ + struct inode *inode = mapping->host; + + set_page_dirty(page); + page_cache_release(page); + + if (pos+copied > inode->i_size) + i_size_write(inode, pos+copied); + + return copied; } static ssize_t @@ -2337,8 +2357,8 @@ static const struct address_space_operations shmem_aops = { .set_page_dirty = __set_page_dirty_no_writeback, #ifdef CONFIG_TMPFS .readpage = shmem_readpage, - .prepare_write = shmem_prepare_write, - .commit_write = simple_commit_write, + .write_begin = shmem_write_begin, + .write_end = shmem_write_end, #endif .migratepage = migrate_page, }; |