diff options
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/fs.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h index c7f0052b4abd..3d7c320d675e 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -374,6 +374,26 @@ struct block_device { int mapping_tagged(struct address_space *mapping, int tag); /* + * Might pages of this file be mapped into userspace? + */ +static inline int mapping_mapped(struct address_space *mapping) +{ + return !list_empty(&mapping->i_mmap) || + !list_empty(&mapping->i_mmap_shared); +} + +/* + * Might pages of this file have been modified in userspace? + * Note that i_mmap_shared holds all the VM_SHARED vmas: do_mmap_pgoff + * marks vma as VM_SHARED if it is shared, and the file was opened for + * writing i.e. vma may be mprotected writable even if now readonly. + */ +static inline int mapping_writably_mapped(struct address_space *mapping) +{ + return !list_empty(&mapping->i_mmap_shared); +} + +/* * Use sequence counter to get consistent i_size on 32-bit processors. */ #if BITS_PER_LONG==32 && defined(CONFIG_SMP) |