diff options
-rw-r--r-- | fs/btrfs/inode.c | 15 | ||||
-rw-r--r-- | fs/buffer.c | 16 | ||||
-rw-r--r-- | fs/ceph/addr.c | 2 | ||||
-rw-r--r-- | fs/ext4/inode.c | 15 | ||||
-rw-r--r-- | fs/iomap/buffered-io.c | 18 | ||||
-rw-r--r-- | fs/ubifs/file.c | 3 | ||||
-rw-r--r-- | include/linux/pagemap.h | 28 |
7 files changed, 46 insertions, 51 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index e3c76645cad7..e2bac1c8f478 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -9014,13 +9014,11 @@ vm_fault_t btrfs_page_mkwrite(struct vm_fault *vmf) ret = VM_FAULT_NOPAGE; /* make the VM retry the fault */ again: lock_page(page); - size = i_size_read(inode); - if ((page->mapping != inode->i_mapping) || - (page_start >= size)) { - /* page got truncated out from underneath us */ + ret2 = page_mkwrite_check_truncate(page, inode); + if (ret2 < 0) goto out_unlock; - } + zero_start = ret2; wait_on_page_writeback(page); lock_extent_bits(io_tree, page_start, page_end, &cached_state); @@ -9041,6 +9039,7 @@ again: goto again; } + size = i_size_read(inode); if (page->index == ((size - 1) >> PAGE_SHIFT)) { reserved_space = round_up(size - page_start, fs_info->sectorsize); @@ -9073,12 +9072,6 @@ again: } ret2 = 0; - /* page is wholly or partially inside EOF */ - if (page_start + PAGE_SIZE > size) - zero_start = offset_in_page(size); - else - zero_start = PAGE_SIZE; - if (zero_start != PAGE_SIZE) { kaddr = kmap(page); memset(kaddr + zero_start, 0, PAGE_SIZE - zero_start); diff --git a/fs/buffer.c b/fs/buffer.c index d8c7242426bb..53aabde57ca7 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -2499,23 +2499,13 @@ int block_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf, struct page *page = vmf->page; struct inode *inode = file_inode(vma->vm_file); unsigned long end; - loff_t size; int ret; lock_page(page); - size = i_size_read(inode); - if ((page->mapping != inode->i_mapping) || - (page_offset(page) > size)) { - /* We overload EFAULT to mean page got truncated */ - ret = -EFAULT; + ret = page_mkwrite_check_truncate(page, inode); + if (ret < 0) goto out_unlock; - } - - /* page is wholly or partially inside EOF */ - if (((page->index + 1) << PAGE_SHIFT) > size) - end = size & ~PAGE_MASK; - else - end = PAGE_SIZE; + end = ret; ret = __block_write_begin(page, 0, end, get_block); if (!ret) diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c index 7ab616601141..ef958aa4adb4 100644 --- a/fs/ceph/addr.c +++ b/fs/ceph/addr.c @@ -1575,7 +1575,7 @@ static vm_fault_t ceph_page_mkwrite(struct vm_fault *vmf) do { lock_page(page); - if ((off > size) || (page->mapping != inode->i_mapping)) { + if (page_mkwrite_check_truncate(page, inode) < 0) { unlock_page(page); ret = VM_FAULT_NOPAGE; break; diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 629a25d999f0..3244803df30a 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -5871,13 +5871,11 @@ vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf) { struct vm_area_struct *vma = vmf->vma; struct page *page = vmf->page; - loff_t size; unsigned long len; int err; vm_fault_t ret; struct file *file = vma->vm_file; struct inode *inode = file_inode(file); - struct address_space *mapping = inode->i_mapping; handle_t *handle; get_block_t *get_block; int retries = 0; @@ -5907,18 +5905,13 @@ vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf) } lock_page(page); - size = i_size_read(inode); - /* Page got truncated from under us? */ - if (page->mapping != mapping || page_offset(page) > size) { + err = page_mkwrite_check_truncate(page, inode); + if (err < 0) { unlock_page(page); - ret = VM_FAULT_NOPAGE; - goto out; + goto out_ret; } + len = err; - if (page->index == size >> PAGE_SHIFT) - len = size & ~PAGE_MASK; - else - len = PAGE_SIZE; /* * Return if we have all the buffers mapped. This avoids the need to do * journal_start/journal_stop which can block and take a long time diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c index 828444e14d09..7c84c4c027c4 100644 --- a/fs/iomap/buffered-io.c +++ b/fs/iomap/buffered-io.c @@ -1077,24 +1077,16 @@ vm_fault_t iomap_page_mkwrite(struct vm_fault *vmf, const struct iomap_ops *ops) struct page *page = vmf->page; struct inode *inode = file_inode(vmf->vma->vm_file); unsigned long length; - loff_t offset, size; + loff_t offset; ssize_t ret; lock_page(page); - size = i_size_read(inode); - offset = page_offset(page); - if (page->mapping != inode->i_mapping || offset > size) { - /* We overload EFAULT to mean page got truncated */ - ret = -EFAULT; + ret = page_mkwrite_check_truncate(page, inode); + if (ret < 0) goto out_unlock; - } - - /* page is wholly or partially inside EOF */ - if (offset > size - PAGE_SIZE) - length = offset_in_page(size); - else - length = PAGE_SIZE; + length = ret; + offset = page_offset(page); while (length > 0) { ret = iomap_apply(inode, offset, length, IOMAP_WRITE | IOMAP_FAULT, ops, page, diff --git a/fs/ubifs/file.c b/fs/ubifs/file.c index cd52585c8f4f..91f7a1f2db0d 100644 --- a/fs/ubifs/file.c +++ b/fs/ubifs/file.c @@ -1563,8 +1563,7 @@ static vm_fault_t ubifs_vm_page_mkwrite(struct vm_fault *vmf) } lock_page(page); - if (unlikely(page->mapping != inode->i_mapping || - page_offset(page) > i_size_read(inode))) { + if (unlikely(page_mkwrite_check_truncate(page, inode) < 0)) { /* Page got truncated out from underneath us */ goto sigbus; } diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index 37a4d9e32cd3..ccb14b6a16b5 100644 --- a/include/linux/pagemap.h +++ b/include/linux/pagemap.h @@ -636,4 +636,32 @@ static inline unsigned long dir_pages(struct inode *inode) PAGE_SHIFT; } +/** + * page_mkwrite_check_truncate - check if page was truncated + * @page: the page to check + * @inode: the inode to check the page against + * + * Returns the number of bytes in the page up to EOF, + * or -EFAULT if the page was truncated. + */ +static inline int page_mkwrite_check_truncate(struct page *page, + struct inode *inode) +{ + loff_t size = i_size_read(inode); + pgoff_t index = size >> PAGE_SHIFT; + int offset = offset_in_page(size); + + if (page->mapping != inode->i_mapping) + return -EFAULT; + + /* page is wholly inside EOF */ + if (page->index < index) + return PAGE_SIZE; + /* page is wholly past EOF */ + if (page->index > index || !offset) + return -EFAULT; + /* page is partially inside EOF */ + return offset; +} + #endif /* _LINUX_PAGEMAP_H */ |