diff options
| -rw-r--r-- | fs/ocfs2/extent_map.c | 45 | ||||
| -rw-r--r-- | fs/ocfs2/extent_map.h | 3 |
2 files changed, 48 insertions, 0 deletions
diff --git a/fs/ocfs2/extent_map.c b/fs/ocfs2/extent_map.c index e4719e0a3f99..06cb96462bf9 100644 --- a/fs/ocfs2/extent_map.c +++ b/fs/ocfs2/extent_map.c @@ -38,6 +38,7 @@ #include "inode.h" #include "super.h" #include "symlink.h" +#include "aops.h" #include "ocfs2_trace.h" #include "buffer_head_io.h" @@ -832,6 +833,50 @@ out: return ret; } +/* Is IO overwriting allocated blocks? */ +int ocfs2_overwrite_io(struct inode *inode, struct buffer_head *di_bh, + u64 map_start, u64 map_len) +{ + int ret = 0, is_last; + u32 mapping_end, cpos; + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + struct ocfs2_extent_rec rec; + + if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) { + if (ocfs2_size_fits_inline_data(di_bh, map_start + map_len)) + return ret; + else + return -EAGAIN; + } + + cpos = map_start >> osb->s_clustersize_bits; + mapping_end = ocfs2_clusters_for_bytes(inode->i_sb, + map_start + map_len); + is_last = 0; + while (cpos < mapping_end && !is_last) { + ret = ocfs2_get_clusters_nocache(inode, di_bh, cpos, + NULL, &rec, &is_last); + if (ret) { + mlog_errno(ret); + goto out; + } + + if (rec.e_blkno == 0ULL) + break; + + if (rec.e_flags & OCFS2_EXT_REFCOUNTED) + break; + + cpos = le32_to_cpu(rec.e_cpos) + + le16_to_cpu(rec.e_leaf_clusters); + } + + if (cpos < mapping_end) + ret = -EAGAIN; +out: + return ret; +} + int ocfs2_seek_data_hole_offset(struct file *file, loff_t *offset, int whence) { struct inode *inode = file->f_mapping->host; diff --git a/fs/ocfs2/extent_map.h b/fs/ocfs2/extent_map.h index 67ea57d2fd59..1057586ec19f 100644 --- a/fs/ocfs2/extent_map.h +++ b/fs/ocfs2/extent_map.h @@ -53,6 +53,9 @@ int ocfs2_extent_map_get_blocks(struct inode *inode, u64 v_blkno, u64 *p_blkno, int ocfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, u64 map_start, u64 map_len); +int ocfs2_overwrite_io(struct inode *inode, struct buffer_head *di_bh, + u64 map_start, u64 map_len); + int ocfs2_seek_data_hole_offset(struct file *file, loff_t *offset, int origin); int ocfs2_xattr_get_clusters(struct inode *inode, u32 v_cluster, |