ceph: factor out libceph from Ceph file system
This factors out protocol and low-level storage parts of ceph into a
separate libceph module living in net/ceph and include/linux/ceph. This
is mostly a matter of moving files around. However, a few key pieces
of the interface change as well:
- ceph_client becomes ceph_fs_client and ceph_client, where the latter
captures the mon and osd clients, and the fs_client gets the mds client
and file system specific pieces.
- Mount option parsing and debugfs setup is correspondingly broken into
two pieces.
- The mon client gets a generic handler callback for otherwise unknown
messages (mds map, in this case).
- The basic supported/required feature bits can be expanded (and are by
ceph_fs_client).
No functional change, aside from some subtle error handling cases that got
cleaned up in the refactoring process.
Signed-off-by: Sage Weil <sage@newdream.net>
diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index b87638e..e2e9044 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -1,7 +1,7 @@
#ifndef _FS_CEPH_SUPER_H
#define _FS_CEPH_SUPER_H
-#include "ceph_debug.h"
+#include <linux/ceph/ceph_debug.h>
#include <asm/unaligned.h>
#include <linux/backing-dev.h>
@@ -14,13 +14,7 @@
#include <linux/writeback.h>
#include <linux/slab.h>
-#include "types.h"
-#include "messenger.h"
-#include "msgpool.h"
-#include "mon_client.h"
-#include "mds_client.h"
-#include "osd_client.h"
-#include "ceph_fs.h"
+#include <linux/ceph/libceph.h>
/* f_type in struct statfs */
#define CEPH_SUPER_MAGIC 0x00c36400
@@ -30,42 +24,25 @@
#define CEPH_BLOCK_SHIFT 20 /* 1 MB */
#define CEPH_BLOCK (1 << CEPH_BLOCK_SHIFT)
-/*
- * Supported features
- */
-#define CEPH_FEATURE_SUPPORTED CEPH_FEATURE_NOSRCADDR | CEPH_FEATURE_FLOCK
-#define CEPH_FEATURE_REQUIRED CEPH_FEATURE_NOSRCADDR
+#define CEPH_MOUNT_OPT_DIRSTAT (1<<4) /* `cat dirname` for stats */
+#define CEPH_MOUNT_OPT_RBYTES (1<<5) /* dir st_bytes = rbytes */
+#define CEPH_MOUNT_OPT_NOASYNCREADDIR (1<<7) /* no dcache readdir */
-/*
- * mount options
- */
-#define CEPH_OPT_FSID (1<<0)
-#define CEPH_OPT_NOSHARE (1<<1) /* don't share client with other sbs */
-#define CEPH_OPT_MYIP (1<<2) /* specified my ip */
-#define CEPH_OPT_DIRSTAT (1<<4) /* funky `cat dirname` for stats */
-#define CEPH_OPT_RBYTES (1<<5) /* dir st_bytes = rbytes */
-#define CEPH_OPT_NOCRC (1<<6) /* no data crc on writes */
-#define CEPH_OPT_NOASYNCREADDIR (1<<7) /* no dcache readdir */
+#define CEPH_MOUNT_OPT_DEFAULT (CEPH_MOUNT_OPT_RBYTES)
-#define CEPH_OPT_DEFAULT (CEPH_OPT_RBYTES)
+#define ceph_set_mount_opt(fsc, opt) \
+ (fsc)->mount_options->flags |= CEPH_MOUNT_OPT_##opt;
+#define ceph_test_mount_opt(fsc, opt) \
+ (!!((fsc)->mount_options->flags & CEPH_MOUNT_OPT_##opt))
-#define ceph_set_opt(client, opt) \
- (client)->mount_args->flags |= CEPH_OPT_##opt;
-#define ceph_test_opt(client, opt) \
- (!!((client)->mount_args->flags & CEPH_OPT_##opt))
+#define CEPH_MAX_READDIR_DEFAULT 1024
+#define CEPH_MAX_READDIR_BYTES_DEFAULT (512*1024)
+#define CEPH_SNAPDIRNAME_DEFAULT ".snap"
-
-struct ceph_mount_args {
- int sb_flags;
+struct ceph_mount_options {
int flags;
- struct ceph_fsid fsid;
- struct ceph_entity_addr my_addr;
- int num_mon;
- struct ceph_entity_addr *mon_addr;
- int mount_timeout;
- int osd_idle_ttl;
- int osd_timeout;
- int osd_keepalive_timeout;
+ int sb_flags;
+
int wsize;
int rsize; /* max readahead */
int congestion_kb; /* max writeback in flight */
@@ -73,82 +50,25 @@
int cap_release_safety;
int max_readdir; /* max readdir result (entires) */
int max_readdir_bytes; /* max readdir result (bytes) */
+
+ /*
+ * everything above this point can be memcmp'd; everything below
+ * is handled in compare_mount_options()
+ */
+
char *snapdir_name; /* default ".snap" */
- char *name;
- char *secret;
};
-/*
- * defaults
- */
-#define CEPH_MOUNT_TIMEOUT_DEFAULT 60
-#define CEPH_OSD_TIMEOUT_DEFAULT 60 /* seconds */
-#define CEPH_OSD_KEEPALIVE_DEFAULT 5
-#define CEPH_OSD_IDLE_TTL_DEFAULT 60
-#define CEPH_MOUNT_RSIZE_DEFAULT (512*1024) /* readahead */
-#define CEPH_MAX_READDIR_DEFAULT 1024
-#define CEPH_MAX_READDIR_BYTES_DEFAULT (512*1024)
-
-#define CEPH_MSG_MAX_FRONT_LEN (16*1024*1024)
-#define CEPH_MSG_MAX_DATA_LEN (16*1024*1024)
-
-#define CEPH_SNAPDIRNAME_DEFAULT ".snap"
-#define CEPH_AUTH_NAME_DEFAULT "guest"
-/*
- * Delay telling the MDS we no longer want caps, in case we reopen
- * the file. Delay a minimum amount of time, even if we send a cap
- * message for some other reason. Otherwise, take the oppotunity to
- * update the mds to avoid sending another message later.
- */
-#define CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT 5 /* cap release delay */
-#define CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT 60 /* cap release delay */
-
-#define CEPH_CAP_RELEASE_SAFETY_DEFAULT (CEPH_CAPS_PER_RELEASE * 4)
-
-/* mount state */
-enum {
- CEPH_MOUNT_MOUNTING,
- CEPH_MOUNT_MOUNTED,
- CEPH_MOUNT_UNMOUNTING,
- CEPH_MOUNT_UNMOUNTED,
- CEPH_MOUNT_SHUTDOWN,
-};
-
-/*
- * subtract jiffies
- */
-static inline unsigned long time_sub(unsigned long a, unsigned long b)
-{
- BUG_ON(time_after(b, a));
- return (long)a - (long)b;
-}
-
-/*
- * per-filesystem client state
- *
- * possibly shared by multiple mount points, if they are
- * mounting the same ceph filesystem/cluster.
- */
-struct ceph_client {
- struct ceph_fsid fsid;
- bool have_fsid;
-
- struct mutex mount_mutex; /* serialize mount attempts */
- struct ceph_mount_args *mount_args;
-
+struct ceph_fs_client {
struct super_block *sb;
+ struct ceph_mount_options *mount_options;
+ struct ceph_client *client;
+
unsigned long mount_state;
- wait_queue_head_t auth_wq;
-
- int auth_err;
-
int min_caps; /* min caps i added */
- struct ceph_messenger *msgr; /* messenger instance */
- struct ceph_mon_client monc;
- struct ceph_mds_client mdsc;
- struct ceph_osd_client osdc;
+ struct ceph_mds_client *mdsc;
/* writeback */
mempool_t *wb_pagevec_pool;
@@ -160,14 +80,14 @@
struct backing_dev_info backing_dev_info;
#ifdef CONFIG_DEBUG_FS
- struct dentry *debugfs_monmap;
- struct dentry *debugfs_mdsmap, *debugfs_osdmap;
- struct dentry *debugfs_dir, *debugfs_dentry_lru, *debugfs_caps;
+ struct dentry *debugfs_dentry_lru, *debugfs_caps;
struct dentry *debugfs_congestion_kb;
struct dentry *debugfs_bdi;
+ struct dentry *debugfs_mdsc, *debugfs_mdsmap;
#endif
};
+
/*
* File i/o capability. This tracks shared state with the metadata
* server that allows us to cache or writeback attributes or to read
@@ -275,6 +195,20 @@
int should_free_val;
};
+/*
+ * Ceph dentry state
+ */
+struct ceph_dentry_info {
+ struct ceph_mds_session *lease_session;
+ u32 lease_gen, lease_shared_gen;
+ u32 lease_seq;
+ unsigned long lease_renew_after, lease_renew_from;
+ struct list_head lru;
+ struct dentry *dentry;
+ u64 time;
+ u64 offset;
+};
+
struct ceph_inode_xattrs_info {
/*
* (still encoded) xattr blob. we avoid the overhead of parsing
@@ -296,11 +230,6 @@
/*
* 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 */
-
struct ceph_inode_info {
struct ceph_vino i_vino; /* ceph ino + snap */
@@ -391,6 +320,63 @@
return container_of(inode, struct ceph_inode_info, vfs_inode);
}
+static inline struct ceph_vino ceph_vino(struct inode *inode)
+{
+ return ceph_inode(inode)->i_vino;
+}
+
+/*
+ * ino_t is <64 bits on many architectures, blech.
+ *
+ * don't include snap in ino hash, at least for now.
+ */
+static inline ino_t ceph_vino_to_ino(struct ceph_vino vino)
+{
+ ino_t ino = (ino_t)vino.ino; /* ^ (vino.snap << 20); */
+#if BITS_PER_LONG == 32
+ ino ^= vino.ino >> (sizeof(u64)-sizeof(ino_t)) * 8;
+ if (!ino)
+ ino = 1;
+#endif
+ return ino;
+}
+
+/* for printf-style formatting */
+#define ceph_vinop(i) ceph_inode(i)->i_vino.ino, ceph_inode(i)->i_vino.snap
+
+static inline u64 ceph_ino(struct inode *inode)
+{
+ return ceph_inode(inode)->i_vino.ino;
+}
+static inline u64 ceph_snap(struct inode *inode)
+{
+ return ceph_inode(inode)->i_vino.snap;
+}
+
+static inline int ceph_ino_compare(struct inode *inode, void *data)
+{
+ struct ceph_vino *pvino = (struct ceph_vino *)data;
+ struct ceph_inode_info *ci = ceph_inode(inode);
+ return ci->i_vino.ino == pvino->ino &&
+ ci->i_vino.snap == pvino->snap;
+}
+
+static inline struct inode *ceph_find_inode(struct super_block *sb,
+ struct ceph_vino vino)
+{
+ ino_t t = ceph_vino_to_ino(vino);
+ return ilookup5(sb, t, ceph_ino_compare, &vino);
+}
+
+
+/*
+ * 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 */
+
static inline void ceph_i_clear(struct inode *inode, unsigned mask)
{
struct ceph_inode_info *ci = ceph_inode(inode);
@@ -432,20 +418,6 @@
struct ceph_inode_frag *pfrag,
int *found);
-/*
- * Ceph dentry state
- */
-struct ceph_dentry_info {
- struct ceph_mds_session *lease_session;
- u32 lease_gen, lease_shared_gen;
- u32 lease_seq;
- unsigned long lease_renew_after, lease_renew_from;
- struct list_head lru;
- struct dentry *dentry;
- u64 time;
- u64 offset;
-};
-
static inline struct ceph_dentry_info *ceph_dentry(struct dentry *dentry)
{
return (struct ceph_dentry_info *)dentry->d_fsdata;
@@ -456,22 +428,6 @@
return ((loff_t)frag << 32) | (loff_t)off;
}
-/*
- * ino_t is <64 bits on many architectures, blech.
- *
- * don't include snap in ino hash, at least for now.
- */
-static inline ino_t ceph_vino_to_ino(struct ceph_vino vino)
-{
- ino_t ino = (ino_t)vino.ino; /* ^ (vino.snap << 20); */
-#if BITS_PER_LONG == 32
- ino ^= vino.ino >> (sizeof(u64)-sizeof(ino_t)) * 8;
- if (!ino)
- ino = 1;
-#endif
- return ino;
-}
-
static inline int ceph_set_ino_cb(struct inode *inode, void *data)
{
ceph_inode(inode)->i_vino = *(struct ceph_vino *)data;
@@ -479,39 +435,6 @@
return 0;
}
-static inline struct ceph_vino ceph_vino(struct inode *inode)
-{
- return ceph_inode(inode)->i_vino;
-}
-
-/* for printf-style formatting */
-#define ceph_vinop(i) ceph_inode(i)->i_vino.ino, ceph_inode(i)->i_vino.snap
-
-static inline u64 ceph_ino(struct inode *inode)
-{
- return ceph_inode(inode)->i_vino.ino;
-}
-static inline u64 ceph_snap(struct inode *inode)
-{
- return ceph_inode(inode)->i_vino.snap;
-}
-
-static inline int ceph_ino_compare(struct inode *inode, void *data)
-{
- struct ceph_vino *pvino = (struct ceph_vino *)data;
- struct ceph_inode_info *ci = ceph_inode(inode);
- return ci->i_vino.ino == pvino->ino &&
- ci->i_vino.snap == pvino->snap;
-}
-
-static inline struct inode *ceph_find_inode(struct super_block *sb,
- struct ceph_vino vino)
-{
- ino_t t = ceph_vino_to_ino(vino);
- return ilookup5(sb, t, ceph_ino_compare, &vino);
-}
-
-
/*
* caps helpers
*/
@@ -576,18 +499,18 @@
struct ceph_cap_reservation *ctx, int need);
extern int ceph_unreserve_caps(struct ceph_mds_client *mdsc,
struct ceph_cap_reservation *ctx);
-extern void ceph_reservation_status(struct ceph_client *client,
+extern void ceph_reservation_status(struct ceph_fs_client *client,
int *total, int *avail, int *used,
int *reserved, int *min);
-static inline struct ceph_client *ceph_inode_to_client(struct inode *inode)
+static inline struct ceph_fs_client *ceph_inode_to_client(struct inode *inode)
{
- return (struct ceph_client *)inode->i_sb->s_fs_info;
+ return (struct ceph_fs_client *)inode->i_sb->s_fs_info;
}
-static inline struct ceph_client *ceph_sb_to_client(struct super_block *sb)
+static inline struct ceph_fs_client *ceph_sb_to_client(struct super_block *sb)
{
- return (struct ceph_client *)sb->s_fs_info;
+ return (struct ceph_fs_client *)sb->s_fs_info;
}
@@ -617,51 +540,6 @@
/*
- * snapshots
- */
-
-/*
- * A "snap context" is the set of existing snapshots when we
- * write data. It is used by the OSD to guide its COW behavior.
- *
- * The ceph_snap_context is refcounted, and attached to each dirty
- * page, indicating which context the dirty data belonged when it was
- * dirtied.
- */
-struct ceph_snap_context {
- atomic_t nref;
- u64 seq;
- int num_snaps;
- u64 snaps[];
-};
-
-static inline struct ceph_snap_context *
-ceph_get_snap_context(struct ceph_snap_context *sc)
-{
- /*
- printk("get_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref),
- atomic_read(&sc->nref)+1);
- */
- if (sc)
- atomic_inc(&sc->nref);
- return sc;
-}
-
-static inline void ceph_put_snap_context(struct ceph_snap_context *sc)
-{
- if (!sc)
- return;
- /*
- printk("put_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref),
- atomic_read(&sc->nref)-1);
- */
- if (atomic_dec_and_test(&sc->nref)) {
- /*printk(" deleting snap_context %p\n", sc);*/
- kfree(sc);
- }
-}
-
-/*
* A "snap realm" describes a subset of the file hierarchy sharing
* the same set of snapshots that apply to it. The realms themselves
* are organized into a hierarchy, such that children inherit (some of)
@@ -699,16 +577,33 @@
spinlock_t inodes_with_caps_lock;
};
-
-
-/*
- * calculate the number of pages a given length and offset map onto,
- * if we align the data.
- */
-static inline int calc_pages_for(u64 off, u64 len)
+static inline int default_congestion_kb(void)
{
- return ((off+len+PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT) -
- (off >> PAGE_CACHE_SHIFT);
+ int congestion_kb;
+
+ /*
+ * Copied from NFS
+ *
+ * congestion size, scale with available memory.
+ *
+ * 64MB: 8192k
+ * 128MB: 11585k
+ * 256MB: 16384k
+ * 512MB: 23170k
+ * 1GB: 32768k
+ * 2GB: 46340k
+ * 4GB: 65536k
+ * 8GB: 92681k
+ * 16GB: 131072k
+ *
+ * This allows larger machines to have larger/more transfers.
+ * Limit the default to 256M
+ */
+ congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10);
+ if (congestion_kb > 256*1024)
+ congestion_kb = 256*1024;
+
+ return congestion_kb;
}
@@ -741,16 +636,6 @@
ci_item)->writing;
}
-
-/* super.c */
-extern struct kmem_cache *ceph_inode_cachep;
-extern struct kmem_cache *ceph_cap_cachep;
-extern struct kmem_cache *ceph_dentry_cachep;
-extern struct kmem_cache *ceph_file_cachep;
-
-extern const char *ceph_msg_type_name(int type);
-extern int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid);
-
/* inode.c */
extern const struct inode_operations ceph_file_iops;
@@ -857,12 +742,18 @@
/* file.c */
extern const struct file_operations ceph_file_fops;
extern const struct address_space_operations ceph_aops;
+extern int ceph_copy_to_page_vector(struct page **pages,
+ const char *data,
+ loff_t off, size_t len);
+extern int ceph_copy_from_page_vector(struct page **pages,
+ char *data,
+ loff_t off, size_t len);
+extern struct page **ceph_alloc_page_vector(int num_pages, gfp_t flags);
extern int ceph_open(struct inode *inode, struct file *file);
extern struct dentry *ceph_lookup_open(struct inode *dir, struct dentry *dentry,
struct nameidata *nd, int mode,
int locked_dir);
extern int ceph_release(struct inode *inode, struct file *filp);
-extern void ceph_release_page_vector(struct page **pages, int num_pages);
/* dir.c */
extern const struct file_operations ceph_dir_fops;
@@ -892,12 +783,6 @@
/* export.c */
extern const struct export_operations ceph_export_ops;
-/* debugfs.c */
-extern int ceph_debugfs_init(void);
-extern void ceph_debugfs_cleanup(void);
-extern int ceph_debugfs_client_init(struct ceph_client *client);
-extern void ceph_debugfs_client_cleanup(struct ceph_client *client);
-
/* locks.c */
extern int ceph_lock(struct file *file, int cmd, struct file_lock *fl);
extern int ceph_flock(struct file *file, int cmd, struct file_lock *fl);
@@ -914,4 +799,8 @@
return NULL;
}
+/* debugfs.c */
+extern int ceph_fs_debugfs_init(struct ceph_fs_client *client);
+extern void ceph_fs_debugfs_cleanup(struct ceph_fs_client *client);
+
#endif /* _FS_CEPH_SUPER_H */