From: "Yan, Zheng" <zheng.z.yan@xxxxxxxxx>
commit c6ffe10015 moved the flag that tracks if the dcache contents
for a directory are complete to dentry. The problem is there are
lots of places that use ceph_dir_{set,clear,test}_complete() while
holding i_ceph_lock. but ceph_dir_{set,clear,test}_complete() may
sleep because they call dput().
This patch basically reverts that commit. For ceph_d_prune(), it's
called with both the dentry to prune and the parent dentry are
locked. So it's safe to access the parent dentry's d_inode and
clear I_COMPLETE flag.
Signed-off-by: Yan, Zheng <zheng.z.yan@xxxxxxxxx>
---
fs/ceph/caps.c | 8 ++++---
fs/ceph/dir.c | 62 ++++++++++------------------------------------------
fs/ceph/inode.c | 30 +++++++++++--------------
fs/ceph/mds_client.c | 6 ++---
fs/ceph/super.h | 23 ++-----------------
5 files changed, 34 insertions(+), 95 deletions(-)
diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index 61f3833..76634f4 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -490,15 +490,17 @@ 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 D_COMPLETE; we
+ * if we are newly issued FILE_SHARED, clear I_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))
- ceph_dir_clear_complete(&ci->vfs_inode);
+ if (S_ISDIR(ci->vfs_inode.i_mode)) {
+ dout(" marking %p NOT complete\n", &ci->vfs_inode);
+ ci->i_ceph_flags &= ~CEPH_I_COMPLETE;
+ }
}
}
diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
index 8c1aabe..76821be 100644
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -107,7 +107,7 @@ static unsigned fpos_off(loff_t p)
* falling back to a "normal" sync readdir if any dentries in the dir
* are dropped.
*
- * D_COMPLETE tells indicates we have all dentries in the dir. It is
+ * I_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).
*/
@@ -198,8 +198,8 @@ more:
filp->f_pos++;
/* make sure a dentry wasn't dropped while we didn't have parent lock */
- if (!ceph_dir_test_complete(dir)) {
- dout(" lost D_COMPLETE on %p; falling back to mds\n", dir);
+ if (!ceph_i_test(dir, CEPH_I_COMPLETE)) {
+ dout(" lost I_COMPLETE on %p; falling back to mds\n", dir);
err = -EAGAIN;
goto out;
}
@@ -284,7 +284,7 @@ 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 &&
- ceph_dir_test_complete(inode) &&
+ (ci->i_ceph_flags & CEPH_I_COMPLETE) &&
__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) {
spin_unlock(&ci->i_ceph_lock);
err = __dcache_readdir(filp, dirent, filldir);
@@ -350,7 +350,7 @@ more:
if (!req->r_did_prepopulate) {
dout("readdir !did_prepopulate");
- fi->dir_release_count--; /* preclude D_COMPLETE */
+ fi->dir_release_count--; /* preclude I_COMPLETE */
}
/* note next offset and last dentry name */
@@ -429,7 +429,8 @@ more:
*/
spin_lock(&ci->i_ceph_lock);
if (ci->i_release_count == fi->dir_release_count) {
- ceph_dir_set_complete(inode);
+ dout(" marking %p complete\n", inode);
+ ci->i_ceph_flags |= CEPH_I_COMPLETE;
ci->i_max_offset = filp->f_pos;
}
spin_unlock(&ci->i_ceph_lock);
@@ -604,7 +605,7 @@ 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) &&
- ceph_dir_test_complete(dir) &&
+ (ci->i_ceph_flags & CEPH_I_COMPLETE) &&
(__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) {
spin_unlock(&ci->i_ceph_lock);
dout(" dir %p complete, -ENOENT\n", dir);
@@ -908,7 +909,7 @@ static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry,
*/
/* d_move screws up d_subdirs order */
- ceph_dir_clear_complete(new_dir);
+ ceph_i_clear(new_dir, CEPH_I_COMPLETE);
d_move(old_dentry, new_dentry);
@@ -1065,44 +1066,6 @@ static int ceph_snapdir_d_revalidate(struct dentry *dentry,
}
/*
- * Set/clear/test dir complete flag on the dir's dentry.
- */
-void ceph_dir_set_complete(struct inode *inode)
-{
- struct dentry *dentry = d_find_any_alias(inode);
-
- if (dentry && ceph_dentry(dentry) &&
- ceph_test_mount_opt(ceph_sb_to_client(dentry->d_sb), DCACHE)) {
- dout(" marking %p (%p) complete\n", inode, dentry);
- set_bit(CEPH_D_COMPLETE, &ceph_dentry(dentry)->flags);
- }
- dput(dentry);
-}
-
-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) complete\n", inode, dentry);
- set_bit(CEPH_D_COMPLETE, &ceph_dentry(dentry)->flags);
- }
- dput(dentry);
-}
-
-bool ceph_dir_test_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);
- }
- dput(dentry);
- return false;
-}
-
-/*
* When the VFS prunes a dentry from the cache, we need to clear the
* complete flag on the parent directory.
*
@@ -1110,15 +1073,13 @@ bool ceph_dir_test_complete(struct inode *inode)
*/
static void ceph_d_prune(struct dentry *dentry)
{
- struct ceph_dentry_info *di;
-
dout("ceph_d_prune %p\n", dentry);
/* do we have a valid parent? */
if (IS_ROOT(dentry))
return;
- /* if we are not hashed, we don't affect D_COMPLETE */
+ /* if we are not hashed, we don't affect I_COMPLETE */
if (d_unhashed(dentry))
return;
@@ -1126,8 +1087,7 @@ static void ceph_d_prune(struct dentry *dentry)
* we hold d_lock, so d_parent is stable, and d_fsdata is never
* cleared until d_release
*/
- di = ceph_dentry(dentry->d_parent);
- clear_bit(CEPH_D_COMPLETE, &di->flags);
+ ceph_i_clear(dentry->d_parent->d_inode, CEPH_I_COMPLETE);
}
/*
diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index 2971eaa..42c5769 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -561,7 +561,6 @@ static int fill_inode(struct inode *inode,
struct ceph_inode_info *ci = ceph_inode(inode);
int i;
int issued = 0, implemented;
- int updating_inode = 0;
struct timespec mtime, atime, ctime;
u32 nsplits;
struct ceph_buffer *xattr_blob = NULL;
@@ -601,7 +600,6 @@ static int fill_inode(struct inode *inode,
(ci->i_version & ~1) >= le64_to_cpu(info->version))
goto no_change;
- updating_inode = 1;
issued = __ceph_caps_issued(ci, &implemented);
issued |= implemented | __ceph_caps_dirty(ci);
@@ -716,6 +714,17 @@ static int fill_inode(struct inode *inode,
ceph_vinop(inode), inode->i_mode);
}
+ /* set dir completion flag? */
+ if (S_ISDIR(inode->i_mode) &&
+ ci->i_files == 0 && ci->i_subdirs == 0 &&
+ 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) {
+ dout(" marking %p complete (empty)\n", inode);
+ ci->i_ceph_flags |= CEPH_I_COMPLETE;
+ ci->i_max_offset = 2;
+ }
no_change:
spin_unlock(&ci->i_ceph_lock);
@@ -766,19 +775,6 @@ no_change:
__ceph_get_fmode(ci, cap_fmode);
}
- /* set dir completion flag? */
- if (S_ISDIR(inode->i_mode) &&
- updating_inode && /* didn't jump to no_change */
- ci->i_files == 0 && ci->i_subdirs == 0 &&
- ceph_snap(inode) == CEPH_NOSNAP &&
- (le32_to_cpu(info->cap.caps) & CEPH_CAP_FILE_SHARED) &&
- (issued & CEPH_CAP_FILE_EXCL) == 0 &&
- !ceph_dir_test_complete(inode)) {
- dout(" marking %p complete (empty)\n", inode);
- ceph_dir_set_complete(inode);
- ci->i_max_offset = 2;
- }
-
/* update delegation info? */
if (dirinfo)
ceph_fill_dirfrag(inode, dirinfo);
@@ -860,7 +856,7 @@ static void ceph_set_dentry_offset(struct dentry *dn)
di = ceph_dentry(dn);
spin_lock(&ci->i_ceph_lock);
- if (!ceph_dir_test_complete(inode)) {
+ if ((ceph_inode(inode)->i_ceph_flags & CEPH_I_COMPLETE) == 0) {
spin_unlock(&ci->i_ceph_lock);
return;
}
@@ -1065,7 +1061,7 @@ 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
- * D_COMPLETE.
+ * I_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 ccc68b0..e52b0fb 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -2029,7 +2029,7 @@ out:
}
/*
- * Invalidate dir D_COMPLETE, dentry lease state on an aborted MDS
+ * Invalidate dir I_COMPLETE, dentry lease state on an aborted MDS
* namespace request.
*/
void ceph_invalidate_dir_request(struct ceph_mds_request *req)
@@ -2037,9 +2037,9 @@ 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 (D_COMPLETE, lease(s))\n", inode);
+ dout("invalidate_dir_request %p (I_COMPLETE, lease(s))\n", inode);
spin_lock(&ci->i_ceph_lock);
- ceph_dir_clear_complete(inode);
+ ci->i_ceph_flags &= ~CEPH_I_COMPLETE;
ci->i_release_count++;
spin_unlock(&ci->i_ceph_lock);
diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index 4353ebc..efbcb56 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -204,7 +204,6 @@ struct ceph_inode_xattr {
* Ceph dentry state
*/
struct ceph_dentry_info {
- unsigned long flags;
struct ceph_mds_session *lease_session;
u32 lease_gen, lease_shared_gen;
u32 lease_seq;
@@ -215,18 +214,6 @@ struct ceph_dentry_info {
u64 offset;
};
-/*
- * dentry flags
- *
- * The locking for D_COMPLETE is a bit odd:
- * - we can clear it at almost any time (see ceph_d_prune)
- * - it is only meaningful if:
- * - we hold dir inode i_ceph_lock
- * - we hold dir FILE_SHARED caps
- * - the dentry D_COMPLETE is set
- */
-#define CEPH_D_COMPLETE 1 /* if set, d_u.d_subdirs is complete directory */
-
struct ceph_inode_xattrs_info {
/*
* (still encoded) xattr blob. we avoid the overhead of parsing
@@ -267,7 +254,7 @@ 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 D_COMPLETE */
+ u64 i_max_offset; /* largest readdir offset, set with I_COMPLETE */
struct rb_root i_fragtree;
struct mutex i_fragtree_mutex;
@@ -432,6 +419,7 @@ 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 */
@@ -489,13 +477,6 @@ 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)
--
1.7.11.7
--
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