UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

pnfsblock: bl_find_get_extent 

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@nrchpc.ac.cn>
Signed-off-by: Fred Isaman <iisaman@citi.umich.edu>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Jim Rees <rees@umich.edu>

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@panasas.com>
Signed-off-by: Benny Halevy <bhalevy@tonian.com>
Signed-off-by: Jim Rees <rees@umich.edu>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Fred Isaman 2011-07-30 20:52:48 -04:00 committed by Trond Myklebust
parent e9437ccef9
commit 6d742ba538
2 changed files with 50 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
fs/nfs/blocklayout/blocklayout.h
View File

@ -153,6 +153,9 @@ int nfs4_blk_process_layoutget(struct pnfs_layout_hdr *lo,
void bl_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 *bl_alloc_extent(void);
int bl_add_merge_extent(struct pnfs_block_layout *bl,

47
fs/nfs/blocklayout/extents.c
View File

@ -193,3 +193,50 @@ 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++) {
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;
}
}
if (ret &&
(!cow_read || ret->be_state != PNFS_BLOCK_INVALID_DATA))
break;
}
spin_unlock(&bl->bl_ext_lock);
if (cow_read)
*cow_read = cow;
print_bl_extent(ret);
return ret;
}