diff options
| -rw-r--r-- | fs/ceph/ceph_debug.h | 37 | ||||
| -rw-r--r-- | fs/ceph/ceph_frag.c | 21 | ||||
| -rw-r--r-- | fs/ceph/ceph_frag.h | 109 | ||||
| -rw-r--r-- | fs/ceph/ceph_ver.h | 6 | ||||
| -rw-r--r-- | fs/ceph/super.h | 890 | ||||
| -rw-r--r-- | fs/ceph/types.h | 28 |
6 files changed, 1091 insertions, 0 deletions
diff --git a/fs/ceph/ceph_debug.h b/fs/ceph/ceph_debug.h new file mode 100644 index 000000000000..1818c2305610 --- /dev/null +++ b/fs/ceph/ceph_debug.h @@ -0,0 +1,37 @@ +#ifndef _FS_CEPH_DEBUG_H +#define _FS_CEPH_DEBUG_H + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#ifdef CONFIG_CEPH_FS_PRETTYDEBUG + +/* + * wrap pr_debug to include a filename:lineno prefix on each line. + * this incurs some overhead (kernel size and execution time) due to + * the extra function call at each call site. + */ + +# if defined(DEBUG) || defined(CONFIG_DYNAMIC_DEBUG) +extern const char *ceph_file_part(const char *s, int len); +# define dout(fmt, ...) \ + pr_debug(" %12.12s:%-4d : " fmt, \ + ceph_file_part(__FILE__, sizeof(__FILE__)), \ + __LINE__, ##__VA_ARGS__) +# else +/* faux printk call just to see any compiler warnings. */ +# define dout(fmt, ...) do { \ + if (0) \ + printk(KERN_DEBUG fmt, ##__VA_ARGS__); \ + } while (0) +# endif + +#else + +/* + * or, just wrap pr_debug + */ +# define dout(fmt, ...) pr_debug(" " fmt, ##__VA_ARGS__) + +#endif + +#endif diff --git a/fs/ceph/ceph_frag.c b/fs/ceph/ceph_frag.c new file mode 100644 index 000000000000..ab6cf35c4091 --- /dev/null +++ b/fs/ceph/ceph_frag.c @@ -0,0 +1,21 @@ +/* + * Ceph 'frag' type + */ +#include "types.h" + +int ceph_frag_compare(__u32 a, __u32 b) +{ + unsigned va = ceph_frag_value(a); + unsigned vb = ceph_frag_value(b); + if (va < vb) + return -1; + if (va > vb) + return 1; + va = ceph_frag_bits(a); + vb = ceph_frag_bits(b); + if (va < vb) + return -1; + if (va > vb) + return 1; + return 0; +} diff --git a/fs/ceph/ceph_frag.h b/fs/ceph/ceph_frag.h new file mode 100644 index 000000000000..793f50cb7c22 --- /dev/null +++ b/fs/ceph/ceph_frag.h @@ -0,0 +1,109 @@ +#ifndef _FS_CEPH_FRAG_H +#define _FS_CEPH_FRAG_H + +/* + * "Frags" are a way to describe a subset of a 32-bit number space, + * using a mask and a value to match against that mask. Any given frag + * (subset of the number space) can be partitioned into 2^n sub-frags. + * + * Frags are encoded into a 32-bit word: + * 8 upper bits = "bits" + * 24 lower bits = "value" + * (We could go to 5+27 bits, but who cares.) + * + * We use the _most_ significant bits of the 24 bit value. This makes + * values logically sort. + * + * Unfortunately, because the "bits" field is still in the high bits, we + * can't sort encoded frags numerically. However, it does allow you + * to feed encoded frags as values into frag_contains_value. + */ +static inline __u32 ceph_frag_make(__u32 b, __u32 v) +{ + return (b << 24) | + (v & (0xffffffu << (24-b)) & 0xffffffu); +} +static inline __u32 ceph_frag_bits(__u32 f) +{ + return f >> 24; +} +static inline __u32 ceph_frag_value(__u32 f) +{ + return f & 0xffffffu; +} +static inline __u32 ceph_frag_mask(__u32 f) +{ + return (0xffffffu << (24-ceph_frag_bits(f))) & 0xffffffu; +} +static inline __u32 ceph_frag_mask_shift(__u32 f) +{ + return 24 - ceph_frag_bits(f); +} + +static inline int ceph_frag_contains_value(__u32 f, __u32 v) +{ + return (v & ceph_frag_mask(f)) == ceph_frag_value(f); +} +static inline int ceph_frag_contains_frag(__u32 f, __u32 sub) +{ + /* is sub as specific as us, and contained by us? */ + return ceph_frag_bits(sub) >= ceph_frag_bits(f) && + (ceph_frag_value(sub) & ceph_frag_mask(f)) == ceph_frag_value(f); +} + +static inline __u32 ceph_frag_parent(__u32 f) +{ + return ceph_frag_make(ceph_frag_bits(f) - 1, + ceph_frag_value(f) & (ceph_frag_mask(f) << 1)); +} +static inline int ceph_frag_is_left_child(__u32 f) +{ + return ceph_frag_bits(f) > 0 && + (ceph_frag_value(f) & (0x1000000 >> ceph_frag_bits(f))) == 0; +} +static inline int ceph_frag_is_right_child(__u32 f) +{ + return ceph_frag_bits(f) > 0 && + (ceph_frag_value(f) & (0x1000000 >> ceph_frag_bits(f))) == 1; +} +static inline __u32 ceph_frag_sibling(__u32 f) +{ + return ceph_frag_make(ceph_frag_bits(f), + ceph_frag_value(f) ^ (0x1000000 >> ceph_frag_bits(f))); +} +static inline __u32 ceph_frag_left_child(__u32 f) +{ + return ceph_frag_make(ceph_frag_bits(f)+1, ceph_frag_value(f)); +} +static inline __u32 ceph_frag_right_child(__u32 f) +{ + return ceph_frag_make(ceph_frag_bits(f)+1, + ceph_frag_value(f) | (0x1000000 >> (1+ceph_frag_bits(f)))); +} +static inline __u32 ceph_frag_make_child(__u32 f, int by, int i) +{ + int newbits = ceph_frag_bits(f) + by; + return ceph_frag_make(newbits, + ceph_frag_value(f) | (i << (24 - newbits))); +} +static inline int ceph_frag_is_leftmost(__u32 f) +{ + return ceph_frag_value(f) == 0; +} +static inline int ceph_frag_is_rightmost(__u32 f) +{ + return ceph_frag_value(f) == ceph_frag_mask(f); +} +static inline __u32 ceph_frag_next(__u32 f) +{ + return ceph_frag_make(ceph_frag_bits(f), + ceph_frag_value(f) + (0x1000000 >> ceph_frag_bits(f))); +} + +/* + * comparator to sort frags logically, as when traversing the + * number space in ascending order... + */ +int ceph_frag_compare(__u32 a, __u32 b); + +#endif diff --git a/fs/ceph/ceph_ver.h b/fs/ceph/ceph_ver.h new file mode 100644 index 000000000000..66c3727b671b --- /dev/null +++ b/fs/ceph/ceph_ver.h @@ -0,0 +1,6 @@ +#ifndef __CEPH_VERSION_H +#define __CEPH_VERSION_H + +#define CEPH_GIT_VER 335cd8f952b457095ea2a66aee3db50efb63c91d + +#endif diff --git a/fs/ceph/super.h b/fs/ceph/super.h new file mode 100644 index 000000000000..cfd39ef4023e --- /dev/null +++ b/fs/ceph/super.h @@ -0,0 +1,890 @@ +#ifndef _FS_CEPH_SUPER_H +#define _FS_CEPH_SUPER_H + +#include "ceph_debug.h" + +#include <asm/unaligned.h> +#include <linux/backing-dev.h> +#include <linux/completion.h> +#include <linux/exportfs.h> +#include <linux/fs.h> +#include <linux/mempool.h> +#include <linux/pagemap.h> +#include <linux/wait.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" + +/* f_type in struct statfs */ +#define CEPH_SUPER_MAGIC 0x00c36400 + +/* large granularity for statfs utilization stats to facilitate + * large volume sizes on 32-bit machines. */ +#define CEPH_BLOCK_SHIFT 20 /* 1 MB */ +#define CEPH_BLOCK (1 << CEPH_BLOCK_SHIFT) + +/* + * 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_OPT_DEFAULT (CEPH_OPT_RBYTES) + +#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_MON_MOUNT_ADDR 5 + +struct ceph_mount_args { + int sb_flags; + int flags; + int mount_timeout; + int caps_wanted_delay_min, caps_wanted_delay_max; + struct ceph_fsid fsid; + struct ceph_entity_addr my_addr; + int wsize; + int rsize; /* max readahead */ + int max_readdir; /* max readdir size */ + int osd_timeout; + char *snapdir_name; /* default ".snap" */ + char *secret; + int cap_release_safety; +}; + +/* + * defaults + */ +#define CEPH_MOUNT_TIMEOUT_DEFAULT 60 +#define CEPH_MOUNT_RSIZE_DEFAULT (128*1024) /* readahead */ + +#define CEPH_MSG_MAX_FRONT_LEN (16*1024*1024) +#define CEPH_MSG_MAX_DATA_LEN (16*1024*1024) + +#define CEPH_SNAPDIRNAME_DEFAULT ".snap" + +/* + * 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 */ + + +/* 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 { + __s64 whoami; /* my client number */ + struct dentry *debugfs_monmap; + struct dentry *debugfs_mdsmap, *debugfs_osdmap; + struct dentry *debugfs_dir, *debugfs_dentry_lru, *debugfs_caps; + + struct mutex mount_mutex; /* serialize mount attempts */ + struct ceph_mount_args mount_args; + struct ceph_fsid fsid; + + struct super_block *sb; + + unsigned long mount_state; + wait_queue_head_t mount_wq; + + int mount_err; + void *signed_ticket; /* our keys to the kingdom */ + int signed_ticket_len; + + struct ceph_messenger *msgr; /* messenger instance */ + struct ceph_mon_client monc; + struct ceph_mds_client mdsc; + struct ceph_osd_client osdc; + + /* writeback */ + mempool_t *wb_pagevec_pool; + struct workqueue_struct *wb_wq; + struct workqueue_struct *pg_inv_wq; + struct workqueue_struct *trunc_wq; + + struct backing_dev_info backing_dev_info; +}; + +static inline struct ceph_client *ceph_client(struct super_block *sb) +{ + return sb->s_fs_info; +} + + +/* + * File i/o capability. This tracks shared state with the metadata + * server that allows us to cache or writeback attributes or to read + * and write data. For any given inode, we should have one or more + * capabilities, one issued by each metadata server, and our + * cumulative access is the OR of all issued capabilities. + * + * Each cap is referenced by the inode's i_caps rbtree and by per-mds + * session capability lists. + */ +struct ceph_cap { + struct ceph_inode_info *ci; + struct rb_node ci_node; /* per-ci cap tree */ + struct ceph_mds_session *session; + struct list_head session_caps; /* per-session caplist */ + int mds; + u64 cap_id; /* unique cap id (mds provided) */ + int issued; /* latest, from the mds */ + int implemented; /* implemented superset of issued (for revocation) */ + int mds_wanted; + u32 seq, issue_seq, mseq, gen; + unsigned long last_used; + struct list_head caps_item; +}; + +#define CHECK_CAPS_NODELAY 1 /* do not delay any further */ +#define CHECK_CAPS_AUTHONLY 2 /* only check auth cap */ +#define CHECK_CAPS_FLUSH 4 /* flush any dirty caps */ + +/* + * Snapped cap state that is pending flush to mds. When a snapshot occurs, + * we first complete any in-process sync writes and writeback any dirty + * data before flushing the snapped state (tracked here) back to the MDS. + */ +struct ceph_cap_snap { + atomic_t nref; + struct ceph_inode_info *ci; + struct list_head ci_item, flushing_item; + + u64 follows, flush_tid; + int issued, dirty; + struct ceph_snap_context *context; + + mode_t mode; + uid_t uid; + gid_t gid; + + void *xattr_blob; + int xattr_len; + u64 xattr_version; + + u64 size; + struct timespec mtime, atime, ctime; + u64 time_warp_seq; + int writing; /* a sync write is still in progress */ + int dirty_pages; /* dirty pages awaiting writeback */ +}; + +static inline void ceph_put_cap_snap(struct ceph_cap_snap *capsnap) +{ + if (atomic_dec_and_test(&capsnap->nref)) + kfree(capsnap); +} + +/* + * The frag tree describes how a directory is fragmented, potentially across + * multiple metadata servers. It is also used to indicate points where + * metadata authority is delegated, and whether/where metadata is replicated. + * + * A _leaf_ frag will be present in the i_fragtree IFF there is + * delegation info. That is, if mds >= 0 || ndist > 0. + */ +#define CEPH_MAX_DIRFRAG_REP 4 + +struct ceph_inode_frag { + struct rb_node node; + + /* fragtree state */ + u32 frag; + int split_by; /* i.e. 2^(split_by) children */ + + /* delegation and replication info */ + int mds; /* -1 if same authority as parent */ + int ndist; /* >0 if replicated */ + int dist[CEPH_MAX_DIRFRAG_REP]; +}; + +/* + * We cache inode xattrs as an encoded blob until they are first used, + * at which point we parse them into an rbtree. + */ +struct ceph_inode_xattr { + struct rb_node node; + + const char *name; + int name_len; + const char *val; + int val_len; + int dirty; + + int should_free_name; + int should_free_val; +}; + +struct ceph_inode_xattrs_info { + /* + * (still encoded) xattr blob. we avoid the overhead of parsing + * this until someone actually calls getxattr, etc. + * + * blob->vec.iov_len == 4 implies there are no xattrs; blob == + * NULL means we don't know. + */ + struct ceph_buffer *blob, *prealloc_blob; + + struct rb_root index; + bool dirty; + int count; + int names_size; + int vals_size; + u64 version, index_version; +}; + +/* + * 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 */ + +struct ceph_inode_info { + struct ceph_vino i_vino; /* ceph ino + snap */ + + u64 i_version; + u32 i_time_warp_seq; + + unsigned i_ceph_flags; + unsigned long i_release_count; + + struct ceph_file_layout i_layout; + char *i_symlink; + + /* for dirs */ + 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 */ + + struct rb_root i_fragtree; + struct mutex i_fragtree_mutex; + + struct ceph_inode_xattrs_info i_xattrs; + + /* capabilities. protected _both_ by i_lock and cap->session's + * s_mutex. */ + struct rb_root i_caps; /* cap list */ + struct ceph_cap *i_auth_cap; /* authoritative cap, if any */ + unsigned i_dirty_caps, i_flushing_caps; /* mask of dirtied fields */ + struct list_head i_dirty_item, i_flushing_item; + u64 i_cap_flush_seq; + /* we need to track cap writeback on a per-cap-bit basis, to allow + * overlapping, pipelined cap flushes to the mds. we can probably + * reduce the tid to 8 bits if we're concerned about inode size. */ + u16 i_cap_flush_last_tid, i_cap_flush_tid[CEPH_CAP_BITS]; + wait_queue_head_t i_cap_wq; /* threads waiting on a capability */ + unsigned long i_hold_caps_min; /* jiffies */ + unsigned long i_hold_caps_max; /* jiffies */ + struct list_head i_cap_delay_list; /* for delayed cap release to mds */ + int i_cap_exporting_mds; /* to handle cap migration between */ + unsigned i_cap_exporting_mseq; /* mds's. */ + unsigned i_cap_exporting_issued; + struct ceph_cap_reservation i_cap_migration_resv; + struct list_head i_cap_snaps; /* snapped state pending flush to mds */ + struct ceph_snap_context *i_head_snapc; /* set if wr_buffer_head > 0 */ + unsigned i_snap_caps; /* cap bits for snapped files */ + + int i_nr_by_mode[CEPH_FILE_MODE_NUM]; /* open file counts */ + + u32 i_truncate_seq; /* last truncate to smaller size */ + u64 i_truncate_size; /* and the size we last truncated down to */ + int i_truncate_pending; /* still need to call vmtruncate */ + + u64 i_max_size; /* max file size authorized by mds */ + u64 i_reported_size; /* (max_)size reported to or requested of mds */ + u64 i_wanted_max_size; /* offset we'd like to write too */ + u64 i_requested_max_size; /* max_size we've requested */ + + /* held references to caps */ + int i_pin_ref; + int i_rd_ref, i_rdcache_ref, i_wr_ref; + int i_wrbuffer_ref, i_wrbuffer_ref_head; + u32 i_shared_gen; /* increment each time we get FILE_SHARED */ + u32 i_rdcache_gen; /* we increment this each time we get + FILE_CACHE. If it's non-zero, we + _may_ have cached pages. */ + u32 i_rdcache_revoking; /* RDCACHE gen to async invalidate, if any */ + + struct list_head i_unsafe_writes; /* uncommitted sync writes */ + struct list_head i_unsafe_dirops; /* uncommitted mds dir ops */ + spinlock_t i_unsafe_lock; + + struct ceph_snap_realm *i_snap_realm; /* snap realm (if caps) */ + int i_snap_realm_counter; /* snap realm (if caps) */ + struct list_head i_snap_realm_item; + struct list_head i_snap_flush_item; + + struct work_struct i_wb_work; /* writeback work */ + struct work_struct i_pg_inv_work; /* page invalidation work */ + + struct work_struct i_vmtruncate_work; + + struct inode vfs_inode; /* at end */ +}; + +static inline struct ceph_inode_info *ceph_inode(struct inode *inode) +{ + return list_entry(inode, struct ceph_inode_info, vfs_inode); +} + +static inline void ceph_i_clear(struct inode *inode, unsigned mask) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + + spin_lock(&inode->i_lock); + ci->i_ceph_flags &= ~mask; + spin_unlock(&inode->i_lock); +} + +static inline void ceph_i_set(struct inode *inode, unsigned mask) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + + spin_lock(&inode->i_lock); + ci->i_ceph_flags |= mask; + spin_unlock(&inode->i_lock); +} + +static inline bool ceph_i_test(struct inode *inode, unsigned mask) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + bool r; + + smp_mb(); + r = (ci->i_ceph_flags & mask) == mask; + return r; +} + + +/* find a specific frag @f */ +extern struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, + u32 f); + +/* + * choose fragment for value @v. copy frag content to pfrag, if leaf + * exists + */ +extern u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v, + 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; +} + +static inline loff_t ceph_make_fpos(unsigned frag, unsigned off) +{ + 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; + inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data); + 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 + */ +static inline bool __ceph_is_any_real_caps(struct ceph_inode_info *ci) +{ + return !RB_EMPTY_ROOT(&ci->i_caps); +} + +extern int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented); +extern int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int t); +extern int __ceph_caps_issued_other(struct ceph_inode_info *ci, + struct ceph_cap *cap); + +static inline int ceph_caps_issued(struct ceph_inode_info *ci) +{ + int issued; + spin_lock(&ci->vfs_inode.i_lock); + issued = __ceph_caps_issued(ci, NULL); + spin_unlock(&ci->vfs_inode.i_lock); + return issued; +} + +static inline int ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, + int touch) +{ + int r; + spin_lock(&ci->vfs_inode.i_lock); + r = __ceph_caps_issued_mask(ci, mask, touch); + spin_unlock(&ci->vfs_inode.i_lock); + return r; +} + +static inline int __ceph_caps_dirty(struct ceph_inode_info *ci) +{ + return ci->i_dirty_caps | ci->i_flushing_caps; +} +extern int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask); + +extern int ceph_caps_revoking(struct ceph_inode_info *ci, int mask); +extern int __ceph_caps_used(struct ceph_inode_info *ci); + +extern int __ceph_caps_file_wanted(struct ceph_inode_info *ci); + +/* + * wanted, by virtue of open file modes AND cap refs (buffered/cached data) + */ +static inline int __ceph_caps_wanted(struct ceph_inode_info *ci) +{ + int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci); + if (w & CEPH_CAP_FILE_BUFFER) + w |= CEPH_CAP_FILE_EXCL; /* we want EXCL if dirty data */ + return w; +} + +/* what the mds thinks we want */ +extern int __ceph_caps_mds_wanted(struct ceph_inode_info *ci); + +extern void ceph_caps_init(void); +extern void ceph_caps_finalize(void); +extern int ceph_reserve_caps(struct ceph_cap_reservation *ctx, int need); +extern int ceph_unreserve_caps(struct ceph_cap_reservation *ctx); +extern void ceph_reservation_status(struct ceph_client *client, + int *total, int *avail, int *used, + int *reserved); + +static inline struct ceph_client *ceph_inode_to_client(struct inode *inode) +{ + return (struct ceph_client *)inode->i_sb->s_fs_info; +} + +static inline struct ceph_client *ceph_sb_to_client(struct super_block *sb) +{ + return (struct ceph_client *)sb->s_fs_info; +} + +static inline int ceph_queue_writeback(struct inode *inode) +{ + return queue_work(ceph_inode_to_client(inode)->wb_wq, + &ceph_inode(inode)->i_wb_work); +} + +static inline int ceph_queue_page_invalidation(struct inode *inode) +{ + return queue_work(ceph_inode_to_client(inode)->pg_inv_wq, + &ceph_inode(inode)->i_pg_inv_work); +} + + +/* + * we keep buffered readdir results attached to file->private_data + */ +struct ceph_file_info { + int fmode; /* initialized on open */ + + /* 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 .. */ + u64 next_offset; /* offset of next chunk (last_name's + 1) */ + char *last_name; /* last entry in previous chunk */ + struct dentry *dentry; /* next dentry (for dcache readdir) */ + unsigned long dir_release_count; + + /* used for -o dirstat read() on directory thing */ + char *dir_info; + int dir_info_len; +}; + + + +/* + * 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) + * the snapshots of their parents. + * + * All inodes within the realm that have capabilities are linked into a + * per-realm list. + */ +struct ceph_snap_realm { + u64 ino; + atomic_t nref; + u64 created, seq; + u64 parent_ino; + u64 parent_since; /* snapid when our current parent became so */ + + u64 *prior_parent_snaps; /* snaps inherited from any parents we */ + int num_prior_parent_snaps; /* had prior to parent_since */ + u64 *snaps; /* snaps specific to this realm */ + int num_snaps; + + struct ceph_snap_realm *parent; + struct list_head children; /* list of child realms */ + struct list_head child_item; + + struct list_head empty_item; /* if i have ref==0 */ + + /* the current set of snaps for this realm */ + struct ceph_snap_context *cached_context; + + struct list_head inodes_with_caps; + 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) +{ + return ((off+len+PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT) - + (off >> PAGE_CACHE_SHIFT); +} + + + +/* snap.c */ +struct ceph_snap_realm *ceph_lookup_snap_realm(struct ceph_mds_client *mdsc, + u64 ino); +extern void ceph_get_snap_realm(struct ceph_mds_client *mdsc, + struct ceph_snap_realm *realm); +extern void ceph_put_snap_realm(struct ceph_mds_client *mdsc, + struct ceph_snap_realm *realm); +extern int ceph_update_snap_trace(struct ceph_mds_client *m, + void *p, void *e, bool deletion); +extern void ceph_handle_snap(struct ceph_mds_client *mdsc, + struct ceph_msg *msg); +extern void ceph_queue_cap_snap(struct ceph_inode_info *ci, + struct ceph_snap_context *snapc); +extern int __ceph_finish_cap_snap(struct ceph_inode_info *ci, + struct ceph_cap_snap *capsnap); +extern void ceph_cleanup_empty_realms(struct ceph_mds_client *mdsc); + +/* + * a cap_snap is "pending" if it is still awaiting an in-progress + * sync write (that may/may not still update size, mtime, etc.). + */ +static inline bool __ceph_have_pending_cap_snap(struct ceph_inode_info *ci) +{ + return !list_empty(&ci->i_cap_snaps) && + list_entry(ci->i_cap_snaps.prev, struct ceph_cap_snap, + 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); + +#define FSID_FORMAT "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-" \ + "%02x%02x%02x%02x%02x%02x" +#define PR_FSID(f) (f)->fsid[0], (f)->fsid[1], (f)->fsid[2], (f)->fsid[3], \ + (f)->fsid[4], (f)->fsid[5], (f)->fsid[6], (f)->fsid[7], \ + (f)->fsid[8], (f)->fsid[9], (f)->fsid[10], (f)->fsid[11], \ + (f)->fsid[12], (f)->fsid[13], (f)->fsid[14], (f)->fsid[15] + +/* inode.c */ +extern const struct inode_operations ceph_file_iops; + +extern struct inode *ceph_alloc_inode(struct super_block *sb); +extern void ceph_destroy_inode(struct inode *inode); + +extern struct inode *ceph_get_inode(struct super_block *sb, + struct ceph_vino vino); +extern struct inode *ceph_get_snapdir(struct inode *parent); +extern int ceph_fill_file_size(struct inode *inode, int issued, + u32 truncate_seq, u64 truncate_size, u64 size); +extern void ceph_fill_file_time(struct inode *inode, int issued, + u64 time_warp_seq, struct timespec *ctime, + struct timespec *mtime, struct timespec *atime); +extern int ceph_fill_trace(struct super_block *sb, + struct ceph_mds_request *req, + struct ceph_mds_session *session); +extern int ceph_readdir_prepopulate(struct ceph_mds_request *req, + struct ceph_mds_session *session); + +extern int ceph_inode_holds_cap(struct inode *inode, int mask); + +extern int ceph_inode_set_size(struct inode *inode, loff_t size); +extern void ceph_inode_writeback(struct work_struct *work); +extern void ceph_vmtruncate_work(struct work_struct *work); +extern void __ceph_do_pending_vmtruncate(struct inode *inode); +extern void __ceph_queue_vmtruncate(struct inode *inode); + +extern int ceph_do_getattr(struct inode *inode, int mask); +extern int ceph_permission(struct inode *inode, int mask); +extern int ceph_setattr(struct dentry *dentry, struct iattr *attr); +extern int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry, + struct kstat *stat); + +/* xattr.c */ +extern int ceph_setxattr(struct dentry *, const char *, const void *, + size_t, int); +extern ssize_t ceph_getxattr(struct dentry *, const char *, void *, size_t); +extern ssize_t ceph_listxattr(struct dentry *, char *, size_t); +extern int ceph_removexattr(struct dentry *, const char *); +extern void __ceph_build_xattrs_blob(struct ceph_inode_info *ci); +extern void __ceph_destroy_xattrs(struct ceph_inode_info *ci); + +/* caps.c */ +extern const char *ceph_cap_string(int c); +extern void ceph_handle_caps(struct ceph_mds_session *session, + struct ceph_msg *msg); +extern int ceph_add_cap(struct inode *inode, + struct ceph_mds_session *session, u64 cap_id, + int fmode, unsigned issued, unsigned wanted, + unsigned cap, unsigned seq, u64 realmino, int flags, + struct ceph_cap_reservation *caps_reservation); +extern void __ceph_remove_cap(struct ceph_cap *cap, + struct ceph_cap_reservation *ctx); +static inline void ceph_remove_cap(struct ceph_cap *cap) +{ + struct inode *inode = &cap->ci->vfs_inode; + spin_lock(&inode->i_lock); + __ceph_remove_cap(cap, NULL); + spin_unlock(&inode->i_lock); +} + +extern void ceph_queue_caps_release(struct inode *inode); +extern int ceph_write_inode(struct inode *inode, int unused); +extern int ceph_fsync(struct file *file, struct dentry *dentry, int datasync); +extern void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc, + struct ceph_mds_session *session); +extern int ceph_get_cap_mds(struct inode *inode); +extern void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps); +extern void ceph_put_cap_refs(struct ceph_inode_info *ci, int had); +extern void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr, + struct ceph_snap_context *snapc); +extern void __ceph_flush_snaps(struct ceph_inode_info *ci, + struct ceph_mds_session **psession); +extern void ceph_check_caps(struct ceph_inode_info *ci, int flags, + struct ceph_mds_session *session); +extern void ceph_check_delayed_caps(struct ceph_mds_client *mdsc, + int flushdirty); + +extern int ceph_encode_inode_release(void **p, struct inode *inode, + int mds, int drop, int unless, int force); +extern int ceph_encode_dentry_release(void **p, struct dentry *dn, + int mds, int drop, int unless); + +extern int ceph_get_caps(struct ceph_inode_info *ci, int need, int want, + int *got, loff_t endoff); + +/* for counting open files by mode */ +static inline void __ceph_get_fmode(struct ceph_inode_info *ci, int mode) +{ + ci->i_nr_by_mode[mode]++; +} +extern void ceph_put_fmode(struct ceph_inode_info *ci, int mode); + +/* addr.c */ +extern const struct address_space_operations ceph_aops; +extern int ceph_mmap(struct file *file, struct vm_area_struct *vma); + +/* file.c */ +extern const struct file_operations ceph_file_fops; +extern const struct address_space_operations ceph_aops; +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; +extern const struct inode_operations ceph_dir_iops; +extern struct dentry_operations ceph_dentry_ops, ceph_snap_dentry_ops, + ceph_snapdir_dentry_ops; + +extern int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry); +extern struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, + struct dentry *dentry, int err); + +extern void ceph_dentry_lru_add(struct dentry *dn); +extern void ceph_dentry_lru_touch(struct dentry *dn); +extern void ceph_dentry_lru_del(struct dentry *dn); + +/* + * our d_ops vary depending on whether the inode is live, + * snapshotted (read-only), or a virtual ".snap" directory. + */ +int ceph_init_dentry(struct dentry *dentry); + + +/* ioctl.c */ +extern long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg); + +/* 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); + +static inline struct inode *get_dentry_parent_inode(struct dentry *dentry) +{ + if (dentry && dentry->d_parent) + return dentry->d_parent->d_inode; + + return NULL; +} + +#endif /* _FS_CEPH_SUPER_H */ diff --git a/fs/ceph/types.h b/fs/ceph/types.h new file mode 100644 index 000000000000..8a514568cab2 --- /dev/null +++ b/fs/ceph/types.h @@ -0,0 +1,28 @@ +#ifndef _FS_CEPH_TYPES_H +#define _FS_CEPH_TYPES_H + +/* needed before including ceph_fs.h */ +#include <linux/in.h> +#include <linux/types.h> +#include <linux/fcntl.h> +#include <linux/string.h> + +#include "ceph_fs.h" +#include "ceph_frag.h" + +/* + * Identify inodes by both their ino AND snapshot id (a u64). + */ +struct ceph_vino { + u64 ino; + u64 snap; +}; + + +/* context for the caps reservation mechanism */ +struct ceph_cap_reservation { + int count; +}; + + +#endif |