diff options
Diffstat (limited to 'mm/shmem.c')
| -rw-r--r-- | mm/shmem.c | 34 |
1 files changed, 28 insertions, 6 deletions
diff --git a/mm/shmem.c b/mm/shmem.c index 4caf8ed24d65..3b8b73928398 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -542,6 +542,21 @@ void shmem_truncate_range(struct inode *inode, loff_t lstart, loff_t lend) } EXPORT_SYMBOL_GPL(shmem_truncate_range); +static int shmem_getattr(struct vfsmount *mnt, struct dentry *dentry, + struct kstat *stat) +{ + struct inode *inode = dentry->d_inode; + struct shmem_inode_info *info = SHMEM_I(inode); + + if (info->alloced - info->swapped != inode->i_mapping->nrpages) { + spin_lock(&info->lock); + shmem_recalc_inode(inode); + spin_unlock(&info->lock); + } + generic_fillattr(inode, stat); + return 0; +} + static int shmem_setattr(struct dentry *dentry, struct iattr *attr) { struct inode *inode = d_inode(dentry); @@ -571,10 +586,16 @@ static int shmem_setattr(struct dentry *dentry, struct iattr *attr) } if (newsize <= oldsize) { loff_t holebegin = round_up(newsize, PAGE_SIZE); - unmap_mapping_range(inode->i_mapping, holebegin, 0, 1); - shmem_truncate_range(inode, newsize, (loff_t)-1); + if (oldsize > holebegin) + unmap_mapping_range(inode->i_mapping, + holebegin, 0, 1); + if (info->alloced) + shmem_truncate_range(inode, + newsize, (loff_t)-1); /* unmap again to remove racily COWed private pages */ - unmap_mapping_range(inode->i_mapping, holebegin, 0, 1); + if (oldsize > holebegin) + unmap_mapping_range(inode->i_mapping, + holebegin, 0, 1); } } @@ -1008,7 +1029,7 @@ static int shmem_replace_page(struct page **pagep, gfp_t gfp, */ oldpage = newpage; } else { - mem_cgroup_migrate(oldpage, newpage, true); + mem_cgroup_replace_page(oldpage, newpage); lru_cache_add_anon(newpage); *pagep = newpage; } @@ -3122,6 +3143,7 @@ static const struct file_operations shmem_file_operations = { }; static const struct inode_operations shmem_inode_operations = { + .getattr = shmem_getattr, .setattr = shmem_setattr, #ifdef CONFIG_TMPFS_XATTR .setxattr = shmem_setxattr, @@ -3363,8 +3385,8 @@ put_path: * shmem_kernel_file_setup - get an unlinked file living in tmpfs which must be * kernel internal. There will be NO LSM permission checks against the * underlying inode. So users of this interface must do LSM checks at a - * higher layer. The one user is the big_key implementation. LSM checks - * are provided at the key level rather than the inode level. + * higher layer. The users are the big_key and shm implementations. LSM + * checks are provided at the key or shm level rather than the inode. * @name: name for dentry (to be seen in /proc/<pid>/maps * @size: size to be set for the file * @flags: VM_NORESERVE suppresses pre-accounting of the entire object size |