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ceph: use new D_COMPLETE dentry flag

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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>
This commit is contained in:
Sage Weil
2011-11-03 09:23:36 -07:00
parent b58dc4100b
commit c6ffe10015
5 changed files with 68 additions and 23 deletions
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59
fs/ceph/dir.c
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@@ -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);
@@ -1092,6 +1091,48 @@ static int ceph_snapdir_d_revalidate(struct dentry *dentry,
return 1;
}
/*
* 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.