diff options
Diffstat (limited to 'fs/f2fs/data.c')
| -rw-r--r-- | fs/f2fs/data.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index ee87407602fa..be4da52604ed 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -3883,6 +3883,83 @@ int f2fs_migrate_page(struct address_space *mapping, #endif #ifdef CONFIG_SWAP +static int check_swap_activate_fast(struct swap_info_struct *sis, + struct file *swap_file, sector_t *span) +{ + struct address_space *mapping = swap_file->f_mapping; + struct inode *inode = mapping->host; + sector_t cur_lblock; + sector_t last_lblock; + sector_t pblock; + sector_t lowest_pblock = -1; + sector_t highest_pblock = 0; + int nr_extents = 0; + unsigned long nr_pblocks; + unsigned long len; + int ret; + + /* + * Map all the blocks into the extent list. This code doesn't try + * to be very smart. + */ + cur_lblock = 0; + last_lblock = logical_to_blk(inode, i_size_read(inode)); + len = i_size_read(inode); + + while (cur_lblock <= last_lblock && cur_lblock < sis->max) { + struct buffer_head map_bh; + pgoff_t next_pgofs; + + cond_resched(); + + memset(&map_bh, 0, sizeof(struct buffer_head)); + map_bh.b_size = len - cur_lblock; + + ret = get_data_block(inode, cur_lblock, &map_bh, 0, + F2FS_GET_BLOCK_FIEMAP, &next_pgofs); + if (ret) + goto err_out; + + /* hole */ + if (!buffer_mapped(&map_bh)) + goto err_out; + + pblock = map_bh.b_blocknr; + nr_pblocks = logical_to_blk(inode, map_bh.b_size); + + if (cur_lblock + nr_pblocks >= sis->max) + nr_pblocks = sis->max - cur_lblock; + + if (cur_lblock) { /* exclude the header page */ + if (pblock < lowest_pblock) + lowest_pblock = pblock; + if (pblock + nr_pblocks - 1 > highest_pblock) + highest_pblock = pblock + nr_pblocks - 1; + } + + /* + * We found a PAGE_SIZE-length, PAGE_SIZE-aligned run of blocks + */ + ret = add_swap_extent(sis, cur_lblock, nr_pblocks, pblock); + if (ret < 0) + goto out; + nr_extents += ret; + cur_lblock += nr_pblocks; + } + ret = nr_extents; + *span = 1 + highest_pblock - lowest_pblock; + if (cur_lblock == 0) + cur_lblock = 1; /* force Empty message */ + sis->max = cur_lblock; + sis->pages = cur_lblock - 1; + sis->highest_bit = cur_lblock - 1; +out: + return ret; +err_out: + pr_err("swapon: swapfile has holes\n"); + return -EINVAL; +} + /* Copied from generic_swapfile_activate() to check any holes */ static int check_swap_activate(struct swap_info_struct *sis, struct file *swap_file, sector_t *span) @@ -3899,6 +3976,9 @@ static int check_swap_activate(struct swap_info_struct *sis, int nr_extents = 0; int ret; + if (PAGE_SIZE == F2FS_BLKSIZE) + return check_swap_activate_fast(sis, swap_file, span); + blkbits = inode->i_blkbits; blocks_per_page = PAGE_SIZE >> blkbits; |