diff options
Diffstat (limited to 'fs/f2fs/node.c')
| -rw-r--r-- | fs/f2fs/node.c | 37 |
1 files changed, 36 insertions, 1 deletions
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c index 5e381b2772f2..eae8977a7277 100644 --- a/fs/f2fs/node.c +++ b/fs/f2fs/node.c @@ -403,6 +403,37 @@ cache: up_write(&nm_i->nat_tree_lock); } +pgoff_t get_next_page_offset(struct dnode_of_data *dn, pgoff_t pgofs) +{ + const long direct_index = ADDRS_PER_INODE(dn->inode); + const long direct_blks = ADDRS_PER_BLOCK; + const long indirect_blks = ADDRS_PER_BLOCK * NIDS_PER_BLOCK; + unsigned int skipped_unit = ADDRS_PER_BLOCK; + int cur_level = dn->cur_level; + int max_level = dn->max_level; + pgoff_t base = 0; + + if (!dn->max_level) + return pgofs + 1; + + while (max_level-- > cur_level) + skipped_unit *= NIDS_PER_BLOCK; + + switch (dn->max_level) { + case 3: + base += 2 * indirect_blks; + case 2: + base += 2 * direct_blks; + case 1: + base += direct_index; + break; + default: + f2fs_bug_on(F2FS_I_SB(dn->inode), 1); + } + + return ((pgofs - base) / skipped_unit + 1) * skipped_unit + base; +} + /* * The maximum depth is four. * Offset[0] will have raw inode offset. @@ -495,7 +526,7 @@ int get_dnode_of_data(struct dnode_of_data *dn, pgoff_t index, int mode) int offset[4]; unsigned int noffset[4]; nid_t nids[4]; - int level, i; + int level, i = 0; int err = 0; level = get_node_path(dn->inode, index, offset, noffset); @@ -585,6 +616,10 @@ release_pages: release_out: dn->inode_page = NULL; dn->node_page = NULL; + if (err == -ENOENT) { + dn->cur_level = i; + dn->max_level = level; + } return err; } |