diff options
Diffstat (limited to 'fs/ntfs/file.c')
| -rw-r--r-- | fs/ntfs/file.c | 23 |
1 files changed, 8 insertions, 15 deletions
diff --git a/fs/ntfs/file.c b/fs/ntfs/file.c index cdedc84e1372..cf3e6ced2d01 100644 --- a/fs/ntfs/file.c +++ b/fs/ntfs/file.c @@ -78,12 +78,8 @@ static int ntfs_file_open(struct inode *vi, struct file *filp) * Extend the initialized size of an attribute described by the ntfs inode @ni * to @new_init_size bytes. This involves zeroing any non-sparse space between * the old initialized size and @new_init_size both in the page cache and on - * disk (if relevant complete pages are zeroed in the page cache then these may - * simply be marked dirty for later writeout). There is one caveat and that is - * that if any uptodate page cache pages between the old initialized size and - * the smaller of @new_init_size and the file size (vfs inode->i_size) are in - * memory, these need to be marked dirty without being zeroed since they could - * be non-zero due to mmap() based writes. + * disk (if relevant complete pages are already uptodate in the page cache then + * these are simply marked dirty). * * As a side-effect, the file size (vfs inode->i_size) may be incremented as, * in the resident attribute case, it is tied to the initialized size and, in @@ -98,10 +94,10 @@ static int ntfs_file_open(struct inode *vi, struct file *filp) * with new data via mmap() based writes, so we cannot just zero it. And since * POSIX specifies that the behaviour of resizing a file whilst it is mmap()ped * is unspecified, we choose not to do zeroing and thus we do not need to touch - * the page at all. For a more detailed explanation see ntfs_truncate() which - * is in fs/ntfs/inode.c. + * the page at all. For a more detailed explanation see ntfs_truncate() in + * fs/ntfs/inode.c. * - * @cached_page and @lru_pvec are just optimisations for dealing with multiple + * @cached_page and @lru_pvec are just optimizations for dealing with multiple * pages. * * Return 0 on success and -errno on error. In the case that an error is @@ -110,9 +106,8 @@ static int ntfs_file_open(struct inode *vi, struct file *filp) * this is the case, the necessary zeroing will also have happened and that all * metadata is self-consistent. * - * Locking: This function locks the mft record of the base ntfs inode and - * maintains the lock throughout execution of the function. This is required - * so that the initialized size of the attribute can be modified safely. + * Locking: i_sem on the vfs inode corrseponsind to the ntfs inode @ni must be + * held by the caller. */ static int ntfs_attr_extend_initialized(ntfs_inode *ni, const s64 new_init_size, struct page **cached_page, struct pagevec *lru_pvec) @@ -1836,7 +1831,7 @@ static ssize_t ntfs_file_buffered_write(struct kiocb *iocb, VCN last_vcn; LCN lcn; unsigned long flags; - size_t bytes, iov_ofs; + size_t bytes, iov_ofs = 0; /* Offset in the current iovec. */ ssize_t status, written; unsigned nr_pages; int err; @@ -1988,8 +1983,6 @@ static ssize_t ntfs_file_buffered_write(struct kiocb *iocb, last_vcn = -1; if (likely(nr_segs == 1)) buf = iov->iov_base; - else - iov_ofs = 0; /* Offset in the current iovec. */ do { VCN vcn; pgoff_t idx, start_idx; |