diff options
Diffstat (limited to 'include/linux/shmem_fs.h')
| -rw-r--r-- | include/linux/shmem_fs.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/include/linux/shmem_fs.h b/include/linux/shmem_fs.h index 0a8499fb9c3c..bfc5899d18e0 100644 --- a/include/linux/shmem_fs.h +++ b/include/linux/shmem_fs.h @@ -18,6 +18,7 @@ struct shmem_inode_info { unsigned long flags; unsigned long alloced; /* data pages alloced to file */ unsigned long swapped; /* subtotal assigned to swap */ + pgoff_t fallocend; /* highest fallocate endindex */ struct list_head shrinklist; /* shrinkable hpage inodes */ struct list_head swaplist; /* chain of maybes on swap */ struct shared_policy policy; /* NUMA memory alloc policy */ @@ -119,6 +120,18 @@ static inline bool shmem_file(struct file *file) return shmem_mapping(file->f_mapping); } +/* + * If fallocate(FALLOC_FL_KEEP_SIZE) has been used, there may be pages + * beyond i_size's notion of EOF, which fallocate has committed to reserving: + * which split_huge_page() must therefore not delete. This use of a single + * "fallocend" per inode errs on the side of not deleting a reservation when + * in doubt: there are plenty of cases when it preserves unreserved pages. + */ +static inline pgoff_t shmem_fallocend(struct inode *inode, pgoff_t eof) +{ + return max(eof, SHMEM_I(inode)->fallocend); +} + extern bool shmem_charge(struct inode *inode, long pages); extern void shmem_uncharge(struct inode *inode, long pages); |