diff options
| -rw-r--r-- | mm/shmem.c | 32 |
1 files changed, 21 insertions, 11 deletions
diff --git a/mm/shmem.c b/mm/shmem.c index b8c429a2d27..1077b1d903d 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -481,7 +481,8 @@ static void shmem_truncate_range(struct inode *inode, loff_t start, loff_t end) long nr_swaps_freed = 0; int offset; int freed; - int punch_hole = 0; + int punch_hole; + unsigned long upper_limit; inode->i_ctime = inode->i_mtime = CURRENT_TIME; idx = (start + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; @@ -492,11 +493,18 @@ static void shmem_truncate_range(struct inode *inode, loff_t start, loff_t end) info->flags |= SHMEM_TRUNCATE; if (likely(end == (loff_t) -1)) { limit = info->next_index; + upper_limit = SHMEM_MAX_INDEX; info->next_index = idx; + punch_hole = 0; } else { - limit = (end + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; - if (limit > info->next_index) - limit = info->next_index; + if (end + 1 >= inode->i_size) { /* we may free a little more */ + limit = (inode->i_size + PAGE_CACHE_SIZE - 1) >> + PAGE_CACHE_SHIFT; + upper_limit = SHMEM_MAX_INDEX; + } else { + limit = (end + 1) >> PAGE_CACHE_SHIFT; + upper_limit = limit; + } punch_hole = 1; } @@ -520,10 +528,10 @@ static void shmem_truncate_range(struct inode *inode, loff_t start, loff_t end) * If there are no indirect blocks or we are punching a hole * below indirect blocks, nothing to be done. */ - if (!topdir || (punch_hole && (limit <= SHMEM_NR_DIRECT))) + if (!topdir || limit <= SHMEM_NR_DIRECT) goto done2; - BUG_ON(limit <= SHMEM_NR_DIRECT); + upper_limit -= SHMEM_NR_DIRECT; limit -= SHMEM_NR_DIRECT; idx = (idx > SHMEM_NR_DIRECT)? (idx - SHMEM_NR_DIRECT): 0; offset = idx % ENTRIES_PER_PAGE; @@ -543,7 +551,7 @@ static void shmem_truncate_range(struct inode *inode, loff_t start, loff_t end) if (*dir) { diroff = ((idx - ENTRIES_PER_PAGEPAGE/2) % ENTRIES_PER_PAGEPAGE) / ENTRIES_PER_PAGE; - if (!diroff && !offset) { + if (!diroff && !offset && upper_limit >= stage) { *dir = NULL; nr_pages_to_free++; list_add(&middir->lru, &pages_to_free); @@ -570,9 +578,11 @@ static void shmem_truncate_range(struct inode *inode, loff_t start, loff_t end) } stage = idx + ENTRIES_PER_PAGEPAGE; middir = *dir; - *dir = NULL; - nr_pages_to_free++; - list_add(&middir->lru, &pages_to_free); + if (upper_limit >= stage) { + *dir = NULL; + nr_pages_to_free++; + list_add(&middir->lru, &pages_to_free); + } shmem_dir_unmap(dir); cond_resched(); dir = shmem_dir_map(middir); @@ -598,7 +608,7 @@ static void shmem_truncate_range(struct inode *inode, loff_t start, loff_t end) } if (offset) offset = 0; - else if (subdir && !page_private(subdir)) { + else if (subdir && upper_limit - idx >= ENTRIES_PER_PAGE) { dir[diroff] = NULL; nr_pages_to_free++; list_add(&subdir->lru, &pages_to_free); |