diff options
| -rw-r--r-- | fs/erofs/zdata.c | 29 |
1 files changed, 9 insertions, 20 deletions
diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c index 8936790618c6..a569ff9dfd04 100644 --- a/fs/erofs/zdata.c +++ b/fs/erofs/zdata.c @@ -710,24 +710,6 @@ static int z_erofs_attach_page(struct z_erofs_decompress_frontend *fe, return ret; } -static void z_erofs_try_to_claim_pcluster(struct z_erofs_decompress_frontend *f) -{ - struct z_erofs_pcluster *pcl = f->pcl; - z_erofs_next_pcluster_t *owned_head = &f->owned_head; - - /* type 1, nil pcluster (this pcluster doesn't belong to any chain.) */ - if (cmpxchg(&pcl->next, Z_EROFS_PCLUSTER_NIL, - *owned_head) == Z_EROFS_PCLUSTER_NIL) { - *owned_head = &pcl->next; - /* so we can attach this pcluster to our submission chain. */ - f->mode = Z_EROFS_PCLUSTER_FOLLOWED; - return; - } - - /* type 2, it belongs to an ongoing chain */ - f->mode = Z_EROFS_PCLUSTER_INFLIGHT; -} - static int z_erofs_register_pcluster(struct z_erofs_decompress_frontend *fe) { struct erofs_map_blocks *map = &fe->map; @@ -803,7 +785,6 @@ static int z_erofs_pcluster_begin(struct z_erofs_decompress_frontend *fe) int ret; DBG_BUGON(fe->pcl); - /* must be Z_EROFS_PCLUSTER_TAIL or pointed to previous pcluster */ DBG_BUGON(fe->owned_head == Z_EROFS_PCLUSTER_NIL); @@ -823,7 +804,15 @@ static int z_erofs_pcluster_begin(struct z_erofs_decompress_frontend *fe) if (ret == -EEXIST) { mutex_lock(&fe->pcl->lock); - z_erofs_try_to_claim_pcluster(fe); + /* check if this pcluster hasn't been linked into any chain. */ + if (cmpxchg(&fe->pcl->next, Z_EROFS_PCLUSTER_NIL, + fe->owned_head) == Z_EROFS_PCLUSTER_NIL) { + /* .. so it can be attached to our submission chain */ + fe->owned_head = &fe->pcl->next; + fe->mode = Z_EROFS_PCLUSTER_FOLLOWED; + } else { /* otherwise, it belongs to an inflight chain */ + fe->mode = Z_EROFS_PCLUSTER_INFLIGHT; + } } else if (ret) { return ret; } |