diff options
Diffstat (limited to 'fs/fs.c')
-rw-r--r-- | fs/fs.c | 25 |
1 files changed, 25 insertions, 0 deletions
@@ -497,6 +497,31 @@ int protect(int fd, size_t count, loff_t offset, int prot) } EXPORT_SYMBOL(protect); +int discard_range(int fd, loff_t count, loff_t offset) +{ + struct fs_driver_d *fsdrv; + FILE *f = fd_to_file(fd); + int ret; + + if (IS_ERR(f)) + return -errno; + if (offset >= f->size) + return 0; + if (count > f->size - offset) + count = f->size - offset; + + fsdrv = f->fsdev->driver; + if (fsdrv->discard_range) + ret = fsdrv->discard_range(&f->fsdev->dev, f, count, offset); + else + ret = -ENOSYS; + + if (ret) + errno = -ret; + + return ret; +} + int protect_file(const char *file, int prot) { int fd, ret; |