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ceph: use flag bit for at_end readdir flag 

This saves us a word of memory per file.

Reviewed-by: Yehuda Sadeh <yehuda@hq.newdream.net>
Signed-off-by: Sage Weil <sage@newdream.net>
This commit is contained in:
Sage Weil 2011-07-26 11:26:18 -07:00
parent 4918b6d140
commit 9cfa1098dc
2 changed files with 6 additions and 6 deletions
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10
fs/ceph/dir.c
View File

@ -133,7 +133,7 @@ more:
d_unhashed(dentry) ? "!hashed" : "hashed",
parent->d_subdirs.prev, parent->d_subdirs.next);
if (p == &parent->d_subdirs) {
fi->at_end = 1;
fi->flags |= CEPH_F_ATEND;
goto out_unlock;
}
spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED);
@ -234,7 +234,7 @@ static int ceph_readdir(struct file *filp, void *dirent, filldir_t filldir)
const int max_bytes = fsc->mount_options->max_readdir_bytes;
dout("readdir %p filp %p frag %u off %u\n", inode, filp, frag, off);
if (fi->at_end)
if (fi->flags & CEPH_F_ATEND)
return 0;
/* always start with . and .. */
@ -403,7 +403,7 @@ more:
dout("readdir next frag is %x\n", frag);
goto more;
}
fi->at_end = 1;
fi->flags |= CEPH_F_ATEND;
/*
* if dir_release_count still matches the dir, no dentries
@ -435,7 +435,7 @@ static void reset_readdir(struct ceph_file_info *fi)
dput(fi->dentry);
fi->dentry = NULL;
}
fi->at_end = 0;
fi->flags &= ~CEPH_F_ATEND;
}
static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int origin)
@ -458,7 +458,7 @@ static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int origin)
if (offset != file->f_pos) {
file->f_pos = offset;
file->f_version = 0;
fi->at_end = 0;
fi->flags &= ~CEPH_F_ATEND;
}
retval = offset;

2
fs/ceph/super.h
View File

@ -544,6 +544,7 @@ extern void ceph_reservation_status(struct ceph_fs_client *client,
* we keep buffered readdir results attached to file->private_data
*/
#define CEPH_F_SYNC 1
#define CEPH_F_ATEND 2
struct ceph_file_info {
short fmode; /* initialized on open */
@ -552,7 +553,6 @@ struct ceph_file_info {
/* readdir: position within the dir */
u32 frag;
struct ceph_mds_request *last_readdir;
int at_end;
/* readdir: position within a frag */
unsigned offset; /* offset of last chunk, adjusted for . and .. */