static int nfs_need_check_write(struct file *filp, struct inode *inode) { struct nfs_open_context *ctx; ctx = nfs_file_open_context(filp); if (test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags) || nfs_ctx_key_to_expire(ctx)) return 1; return 0; }
static int nfs_need_sync_write(struct file *filp, struct inode *inode) { struct nfs_open_context *ctx; if (IS_SYNC(inode) || (filp->f_flags & O_DSYNC)) return 1; ctx = nfs_file_open_context(filp); if (test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags) || nfs_ctx_key_to_expire(ctx)) return 1; return 0; }
static int nfs_write_end(struct file *file, struct address_space *mapping, loff_t pos, unsigned len, unsigned copied, struct page *page, void *fsdata) { unsigned offset = pos & (PAGE_CACHE_SIZE - 1); struct nfs_open_context *ctx = nfs_file_open_context(file); int status; dfprintk(PAGECACHE, "NFS: write_end(%pD2(%lu), %u@%lld)\n", file, mapping->host->i_ino, len, (long long) pos); /* * Zero any uninitialised parts of the page, and then mark the page * as up to date if it turns out that we're extending the file. */ if (!PageUptodate(page)) { unsigned pglen = nfs_page_length(page); unsigned end = offset + len; if (pglen == 0) { zero_user_segments(page, 0, offset, end, PAGE_CACHE_SIZE); SetPageUptodate(page); } else if (end >= pglen) { zero_user_segment(page, end, PAGE_CACHE_SIZE); if (offset == 0) SetPageUptodate(page); } else zero_user_segment(page, pglen, PAGE_CACHE_SIZE); } status = nfs_updatepage(file, page, offset, copied); unlock_page(page); page_cache_release(page); if (status < 0) return status; NFS_I(mapping->host)->write_io += copied; if (nfs_ctx_key_to_expire(ctx)) { status = nfs_wb_all(mapping->host); if (status < 0) return status; } return copied; }