From: Fred <iisaman@xxxxxxxxxxxxxx> Implement bl_find_get_extent(), one of the core extent manipulation routines. [pnfsblock: Lookup list entry of layouts and tags in reverse order] Signed-off-by: Zhang Jingwang <zhangjingwang@xxxxxxxxxxxx> Signed-off-by: Fred Isaman <iisaman@xxxxxxxxxxxxxx> Signed-off-by: Benny Halevy <bhalevy@xxxxxxxxxxx> pnfsblock: fix print format warnings for sector_t and size_t gcc spews warnings about these on x86_64, e.g.: fs/nfs/blocklayout/blocklayout.c:74: warning: format ‘%Lu’ expects type ‘long long unsigned int’, but argument 2 has type ‘sector_t’ fs/nfs/blocklayout/blocklayout.c:388: warning: format ‘%d’ expects type ‘int’, but argument 5 has type ‘size_t’ Signed-off-by: Benny Halevy <bhalevy@xxxxxxxxxxx> Signed-off-by: Benny Halevy <benny@xxxxxxxxxx> --- fs/nfs/blocklayout/blocklayout.h | 3 ++ fs/nfs/blocklayout/extents.c | 47 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 50 insertions(+), 0 deletions(-) diff --git a/fs/nfs/blocklayout/blocklayout.h b/fs/nfs/blocklayout/blocklayout.h index ee402c7..4e61b52 100644 --- a/fs/nfs/blocklayout/blocklayout.h +++ b/fs/nfs/blocklayout/blocklayout.h @@ -197,6 +197,9 @@ int nfs4_blk_process_layoutget(struct pnfs_layout_hdr *lo, void free_block_dev(struct pnfs_block_dev *bdev); /* extents.c */ +struct pnfs_block_extent * +bl_find_get_extent(struct pnfs_block_layout *bl, sector_t isect, + struct pnfs_block_extent **cow_read); void bl_put_extent(struct pnfs_block_extent *be); struct pnfs_block_extent *alloc_extent(void); int bl_add_merge_extent(struct pnfs_block_layout *bl, diff --git a/fs/nfs/blocklayout/extents.c b/fs/nfs/blocklayout/extents.c index d76bb43..14065ca 100644 --- a/fs/nfs/blocklayout/extents.c +++ b/fs/nfs/blocklayout/extents.c @@ -201,3 +201,50 @@ bl_add_merge_extent(struct pnfs_block_layout *bl, bl_put_extent(new); return -EIO; } + +/* Returns extent, or NULL. If a second READ extent exists, it is returned + * in cow_read, if given. + * + * The extents are kept in two seperate ordered lists, one for READ and NONE, + * one for READWRITE and INVALID. Within each list, we assume: + * 1. Extents are ordered by file offset. + * 2. For any given isect, there is at most one extents that matches. + */ +struct pnfs_block_extent * +bl_find_get_extent(struct pnfs_block_layout *bl, sector_t isect, + struct pnfs_block_extent **cow_read) +{ + struct pnfs_block_extent *be, *cow, *ret; + int i; + + dprintk("%s enter with isect %llu\n", __func__, (u64)isect); + cow = ret = NULL; + spin_lock(&bl->bl_ext_lock); + for (i = 0; i < EXTENT_LISTS; i++) { + if (ret && + (!cow_read || ret->be_state != PNFS_BLOCK_INVALID_DATA)) + break; + list_for_each_entry_reverse(be, &bl->bl_extents[i], be_node) { + if (isect >= be->be_f_offset + be->be_length) + break; + if (isect >= be->be_f_offset) { + /* We have found an extent */ + dprintk("%s Get %p (%i)\n", __func__, be, + atomic_read(&be->be_refcnt.refcount)); + kref_get(&be->be_refcnt); + if (!ret) + ret = be; + else if (be->be_state != PNFS_BLOCK_READ_DATA) + bl_put_extent(be); + else + cow = be; + break; + } + } + } + spin_unlock(&bl->bl_ext_lock); + if (cow_read) + *cow_read = cow; + print_bl_extent(ret); + return ret; +} -- 1.7.4.1 -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html