1 // SPDX-License-Identifier: GPL-2.0
16 #include <linux/backing-dev.h>
42 	if (S_ISFIFO(inode->i_mode))  in generic_fadvise()
43 		return -ESPIPE;  in generic_fadvise()
45 	mapping = file->f_mapping;  in generic_fadvise()
47 		return -EINVAL;  in generic_fadvise()
49 	bdi = inode_to_bdi(mapping->host);  in generic_fadvise()
62 			return -EINVAL;  in generic_fadvise()
76 		endbyte--;		/* inclusive */  in generic_fadvise()
80 		file->f_ra.ra_pages = bdi->ra_pages;  in generic_fadvise()
81 		spin_lock(&file->f_lock);  in generic_fadvise()
82 		file->f_mode &= ~(FMODE_RANDOM | FMODE_NOREUSE);  in generic_fadvise()
83 		spin_unlock(&file->f_lock);  in generic_fadvise()
86 		spin_lock(&file->f_lock);  in generic_fadvise()
87 		file->f_mode |= FMODE_RANDOM;  in generic_fadvise()
88 		spin_unlock(&file->f_lock);  in generic_fadvise()
91 		file->f_ra.ra_pages = bdi->ra_pages * 2;  in generic_fadvise()
92 		spin_lock(&file->f_lock);  in generic_fadvise()
93 		file->f_mode &= ~FMODE_RANDOM;  in generic_fadvise()
94 		spin_unlock(&file->f_lock);  in generic_fadvise()
102 		nrpages = end_index - start_index + 1;  in generic_fadvise()
109 		spin_lock(&file->f_lock);  in generic_fadvise()
110 		file->f_mode |= FMODE_NOREUSE;  in generic_fadvise()
111 		spin_unlock(&file->f_lock);  in generic_fadvise()
122 		start_index = (offset+(PAGE_SIZE-1)) >> PAGE_SHIFT;  in generic_fadvise()
128 		 * is page aligned or is at the end of file, we should not skip  in generic_fadvise()
129 		 * that page - discarding the last page is safe enough.  in generic_fadvise()
132 				endbyte != inode->i_size - 1) {  in generic_fadvise()
133 			/* First page is tricky as 0 - 1 = -1, but pgoff_t  in generic_fadvise()
141 			end_index--;  in generic_fadvise()
148 			 * It's common to FADV_DONTNEED right after  in generic_fadvise()
154 			 * them out right away.  in generic_fadvise()
174 		return -EINVAL;  in generic_fadvise()
182 	if (file->f_op->fadvise)  in vfs_fadvise()
183 		return file->f_op->fadvise(file, offset, len, advice);  in vfs_fadvise()
196 		return -EBADF;  in ksys_fadvise64_64()