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authorSage Weil <sage@newdream.net>2011-11-03 09:23:36 -0700
committerSage Weil <sage@newdream.net>2011-11-05 21:10:10 -0700
commitc6ffe10015f4e6fba8a915318b319c43aed1836f (patch)
treedd39730aeb6d00713ca27a1bf34b116d31479151 /fs
parentb58dc4100b9190f2cb437f1f67ffcb9f9acc4923 (diff)
downloadlinux-stericsson-c6ffe10015f4e6fba8a915318b319c43aed1836f.tar.gz
ceph: use new D_COMPLETE dentry flag
We used to use a flag on the directory inode to track whether the dcache contents for a directory were a complete cached copy. Switch to a dentry flag CEPH_D_COMPLETE that is safely updated by ->d_prune(). Signed-off-by: Sage Weil <sage@newdream.net>
Diffstat (limited to 'fs')
-rw-r--r--fs/ceph/caps.c8
-rw-r--r--fs/ceph/dir.c59
-rw-r--r--fs/ceph/inode.c8
-rw-r--r--fs/ceph/mds_client.c6
-rw-r--r--fs/ceph/super.h10
5 files changed, 68 insertions, 23 deletions
diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index 15b21e35078a..0f327c6c9679 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -487,17 +487,15 @@ static void __check_cap_issue(struct ceph_inode_info *ci, struct ceph_cap *cap,
ci->i_rdcache_gen++;
/*
- * if we are newly issued FILE_SHARED, clear I_COMPLETE; we
+ * if we are newly issued FILE_SHARED, clear D_COMPLETE; we
* don't know what happened to this directory while we didn't
* have the cap.
*/
if ((issued & CEPH_CAP_FILE_SHARED) &&
(had & CEPH_CAP_FILE_SHARED) == 0) {
ci->i_shared_gen++;
- if (S_ISDIR(ci->vfs_inode.i_mode)) {
- dout(" marking %p NOT complete\n", &ci->vfs_inode);
- ci->i_ceph_flags &= ~CEPH_I_COMPLETE;
- }
+ if (S_ISDIR(ci->vfs_inode.i_mode))
+ ceph_dir_clear_complete(&ci->vfs_inode);
}
}
diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
index 97fb155b3242..2abd0dfad7f8 100644
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -108,7 +108,7 @@ static unsigned fpos_off(loff_t p)
* falling back to a "normal" sync readdir if any dentries in the dir
* are dropped.
*
- * I_COMPLETE tells indicates we have all dentries in the dir. It is
+ * D_COMPLETE tells indicates we have all dentries in the dir. It is
* defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by
* the MDS if/when the directory is modified).
*/
@@ -199,8 +199,8 @@ more:
filp->f_pos++;
/* make sure a dentry wasn't dropped while we didn't have parent lock */
- if (!ceph_i_test(dir, CEPH_I_COMPLETE)) {
- dout(" lost I_COMPLETE on %p; falling back to mds\n", dir);
+ if (!ceph_dir_test_complete(dir)) {
+ dout(" lost D_COMPLETE on %p; falling back to mds\n", dir);
err = -EAGAIN;
goto out;
}
@@ -285,7 +285,7 @@ static int ceph_readdir(struct file *filp, void *dirent, filldir_t filldir)
if ((filp->f_pos == 2 || fi->dentry) &&
!ceph_test_mount_opt(fsc, NOASYNCREADDIR) &&
ceph_snap(inode) != CEPH_SNAPDIR &&
- (ci->i_ceph_flags & CEPH_I_COMPLETE) &&
+ ceph_dir_test_complete(inode) &&
__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) {
spin_unlock(&inode->i_lock);
err = __dcache_readdir(filp, dirent, filldir);
@@ -351,7 +351,7 @@ more:
if (!req->r_did_prepopulate) {
dout("readdir !did_prepopulate");
- fi->dir_release_count--; /* preclude I_COMPLETE */
+ fi->dir_release_count--; /* preclude D_COMPLETE */
}
/* note next offset and last dentry name */
@@ -430,8 +430,7 @@ more:
*/
spin_lock(&inode->i_lock);
if (ci->i_release_count == fi->dir_release_count) {
- dout(" marking %p complete\n", inode);
- /* ci->i_ceph_flags |= CEPH_I_COMPLETE; */
+ ceph_dir_set_complete(inode);
ci->i_max_offset = filp->f_pos;
}
spin_unlock(&inode->i_lock);
@@ -614,7 +613,7 @@ static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry,
fsc->mount_options->snapdir_name,
dentry->d_name.len) &&
!is_root_ceph_dentry(dir, dentry) &&
- (ci->i_ceph_flags & CEPH_I_COMPLETE) &&
+ ceph_dir_test_complete(dir) &&
(__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) {
spin_unlock(&dir->i_lock);
dout(" dir %p complete, -ENOENT\n", dir);
@@ -934,7 +933,7 @@ static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry,
*/
/* d_move screws up d_subdirs order */
- ceph_i_clear(new_dir, CEPH_I_COMPLETE);
+ ceph_dir_clear_complete(new_dir);
d_move(old_dentry, new_dentry);
@@ -1093,6 +1092,48 @@ static int ceph_snapdir_d_revalidate(struct dentry *dentry,
}
/*
+ * Set/clear/test dir complete flag on the dir's dentry.
+ */
+static struct dentry * __d_find_any_alias(struct inode *inode)
+{
+ struct dentry *alias;
+
+ if (list_empty(&inode->i_dentry))
+ return NULL;
+ alias = list_first_entry(&inode->i_dentry, struct dentry, d_alias);
+ return alias;
+}
+
+void ceph_dir_set_complete(struct inode *inode)
+{
+ struct dentry *dentry = __d_find_any_alias(inode);
+
+ if (dentry && ceph_dentry(dentry)) {
+ dout(" marking %p (%p) complete\n", inode, dentry);
+ set_bit(CEPH_D_COMPLETE, &ceph_dentry(dentry)->flags);
+ }
+}
+
+void ceph_dir_clear_complete(struct inode *inode)
+{
+ struct dentry *dentry = __d_find_any_alias(inode);
+
+ if (dentry && ceph_dentry(dentry)) {
+ dout(" marking %p (%p) NOT complete\n", inode, dentry);
+ clear_bit(CEPH_D_COMPLETE, &ceph_dentry(dentry)->flags);
+ }
+}
+
+bool ceph_dir_test_complete(struct inode *inode)
+{
+ struct dentry *dentry = __d_find_any_alias(inode);
+
+ if (dentry && ceph_dentry(dentry))
+ return test_bit(CEPH_D_COMPLETE, &ceph_dentry(dentry)->flags);
+ return false;
+}
+
+/*
* When the VFS prunes a dentry from the cache, we need to clear the
* complete flag on the parent directory.
*
diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index 1616a0d37cbd..e392bfce84a3 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -771,9 +771,9 @@ no_change:
ceph_snap(inode) == CEPH_NOSNAP &&
(le32_to_cpu(info->cap.caps) & CEPH_CAP_FILE_SHARED) &&
(issued & CEPH_CAP_FILE_EXCL) == 0 &&
- (ci->i_ceph_flags & CEPH_I_COMPLETE) == 0) {
+ !ceph_dir_test_complete(inode)) {
dout(" marking %p complete (empty)\n", inode);
- /* ci->i_ceph_flags |= CEPH_I_COMPLETE; */
+ ceph_dir_set_complete(inode);
ci->i_max_offset = 2;
}
@@ -856,7 +856,7 @@ static void ceph_set_dentry_offset(struct dentry *dn)
di = ceph_dentry(dn);
spin_lock(&inode->i_lock);
- if ((ceph_inode(inode)->i_ceph_flags & CEPH_I_COMPLETE) == 0) {
+ if (!ceph_dir_test_complete(inode)) {
spin_unlock(&inode->i_lock);
return;
}
@@ -1056,7 +1056,7 @@ int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
* d_move() puts the renamed dentry at the end of
* d_subdirs. We need to assign it an appropriate
* directory offset so we can behave when holding
- * I_COMPLETE.
+ * D_COMPLETE.
*/
ceph_set_dentry_offset(req->r_old_dentry);
dout("dn %p gets new offset %lld\n", req->r_old_dentry,
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index 1d72f15fe9f4..b4c3efa163c2 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -2002,7 +2002,7 @@ out:
}
/*
- * Invalidate dir I_COMPLETE, dentry lease state on an aborted MDS
+ * Invalidate dir D_COMPLETE, dentry lease state on an aborted MDS
* namespace request.
*/
void ceph_invalidate_dir_request(struct ceph_mds_request *req)
@@ -2010,9 +2010,9 @@ void ceph_invalidate_dir_request(struct ceph_mds_request *req)
struct inode *inode = req->r_locked_dir;
struct ceph_inode_info *ci = ceph_inode(inode);
- dout("invalidate_dir_request %p (I_COMPLETE, lease(s))\n", inode);
+ dout("invalidate_dir_request %p (D_COMPLETE, lease(s))\n", inode);
spin_lock(&inode->i_lock);
- ci->i_ceph_flags &= ~CEPH_I_COMPLETE;
+ ceph_dir_clear_complete(inode);
ci->i_release_count++;
spin_unlock(&inode->i_lock);
diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index 98e60693c9a1..01bf189e08a9 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -264,7 +264,7 @@ struct ceph_inode_info {
struct timespec i_rctime;
u64 i_rbytes, i_rfiles, i_rsubdirs;
u64 i_files, i_subdirs;
- u64 i_max_offset; /* largest readdir offset, set with I_COMPLETE */
+ u64 i_max_offset; /* largest readdir offset, set with D_COMPLETE */
struct rb_root i_fragtree;
struct mutex i_fragtree_mutex;
@@ -429,7 +429,6 @@ static inline struct inode *ceph_find_inode(struct super_block *sb,
/*
* Ceph inode.
*/
-#define CEPH_I_COMPLETE 1 /* we have complete directory cached */
#define CEPH_I_NODELAY 4 /* do not delay cap release */
#define CEPH_I_FLUSH 8 /* do not delay flush of dirty metadata */
#define CEPH_I_NOFLUSH 16 /* do not flush dirty caps */
@@ -487,6 +486,13 @@ static inline loff_t ceph_make_fpos(unsigned frag, unsigned off)
}
/*
+ * set/clear directory D_COMPLETE flag
+ */
+void ceph_dir_set_complete(struct inode *inode);
+void ceph_dir_clear_complete(struct inode *inode);
+bool ceph_dir_test_complete(struct inode *inode);
+
+/*
* caps helpers
*/
static inline bool __ceph_is_any_real_caps(struct ceph_inode_info *ci)