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Diffstat (limited to 'fs/orangefs/orangefs-kernel.h')
| -rw-r--r-- | fs/orangefs/orangefs-kernel.h | 819 |
1 files changed, 819 insertions, 0 deletions
diff --git a/fs/orangefs/orangefs-kernel.h b/fs/orangefs/orangefs-kernel.h new file mode 100644 index 0000000..8408723 --- /dev/null +++ b/fs/orangefs/orangefs-kernel.h @@ -0,0 +1,819 @@ +/* + * (C) 2001 Clemson University and The University of Chicago + * + * See COPYING in top-level directory. + */ + +/* + * The ORANGEFS Linux kernel support allows ORANGEFS volumes to be mounted and + * accessed through the Linux VFS (i.e. using standard I/O system calls). + * This support is only needed on clients that wish to mount the file system. + * + */ + +/* + * Declarations and macros for the ORANGEFS Linux kernel support. + */ + +#ifndef __ORANGEFSKERNEL_H +#define __ORANGEFSKERNEL_H + +#include <linux/kernel.h> +#include <linux/moduleparam.h> +#include <linux/statfs.h> +#include <linux/backing-dev.h> +#include <linux/device.h> +#include <linux/mpage.h> +#include <linux/namei.h> +#include <linux/errno.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/types.h> +#include <linux/fs.h> +#include <linux/vmalloc.h> + +#include <linux/aio.h> +#include <linux/posix_acl.h> +#include <linux/posix_acl_xattr.h> +#include <linux/compat.h> +#include <linux/mount.h> +#include <linux/uaccess.h> +#include <linux/atomic.h> +#include <linux/uio.h> +#include <linux/sched.h> +#include <linux/mm.h> +#include <linux/wait.h> +#include <linux/dcache.h> +#include <linux/pagemap.h> +#include <linux/poll.h> +#include <linux/rwsem.h> +#include <linux/xattr.h> +#include <linux/exportfs.h> + +#include <asm/unaligned.h> + +#include "orangefs-dev-proto.h" + +#ifdef ORANGEFS_KERNEL_DEBUG +#define ORANGEFS_DEFAULT_OP_TIMEOUT_SECS 10 +#else +#define ORANGEFS_DEFAULT_OP_TIMEOUT_SECS 20 +#endif + +#define ORANGEFS_BUFMAP_WAIT_TIMEOUT_SECS 30 + +#define ORANGEFS_DEFAULT_SLOT_TIMEOUT_SECS 900 /* 15 minutes */ + +#define ORANGEFS_REQDEVICE_NAME "pvfs2-req" + +#define ORANGEFS_DEVREQ_MAGIC 0x20030529 +#define ORANGEFS_LINK_MAX 0x000000FF +#define ORANGEFS_PURGE_RETRY_COUNT 0x00000005 +#define ORANGEFS_SEEK_END 0x00000002 +#define ORANGEFS_MAX_NUM_OPTIONS 0x00000004 +#define ORANGEFS_MAX_MOUNT_OPT_LEN 0x00000080 +#define ORANGEFS_MAX_FSKEY_LEN 64 + +#define MAX_DEV_REQ_UPSIZE (2*sizeof(__s32) + \ +sizeof(__u64) + sizeof(struct orangefs_upcall_s)) +#define MAX_DEV_REQ_DOWNSIZE (2*sizeof(__s32) + \ +sizeof(__u64) + sizeof(struct orangefs_downcall_s)) + +#define BITS_PER_LONG_DIV_8 (BITS_PER_LONG >> 3) + +/* borrowed from irda.h */ +#ifndef MSECS_TO_JIFFIES +#define MSECS_TO_JIFFIES(ms) (((ms)*HZ+999)/1000) +#endif + +#define MAX_ALIGNED_DEV_REQ_UPSIZE \ + (MAX_DEV_REQ_UPSIZE + \ + ((((MAX_DEV_REQ_UPSIZE / \ + (BITS_PER_LONG_DIV_8)) * \ + (BITS_PER_LONG_DIV_8)) + \ + (BITS_PER_LONG_DIV_8)) - \ + MAX_DEV_REQ_UPSIZE)) + +#define MAX_ALIGNED_DEV_REQ_DOWNSIZE \ + (MAX_DEV_REQ_DOWNSIZE + \ + ((((MAX_DEV_REQ_DOWNSIZE / \ + (BITS_PER_LONG_DIV_8)) * \ + (BITS_PER_LONG_DIV_8)) + \ + (BITS_PER_LONG_DIV_8)) - \ + MAX_DEV_REQ_DOWNSIZE)) + +/* + * valid orangefs kernel operation states + * + * unknown - op was just initialized + * waiting - op is on request_list (upward bound) + * inprogr - op is in progress (waiting for downcall) + * serviced - op has matching downcall; ok + * purged - op has to start a timer since client-core + * exited uncleanly before servicing op + */ +enum orangefs_vfs_op_states { + OP_VFS_STATE_UNKNOWN = 0, + OP_VFS_STATE_WAITING = 1, + OP_VFS_STATE_INPROGR = 2, + OP_VFS_STATE_SERVICED = 4, + OP_VFS_STATE_PURGED = 8, +}; + +#define set_op_state_waiting(op) ((op)->op_state = OP_VFS_STATE_WAITING) +#define set_op_state_inprogress(op) ((op)->op_state = OP_VFS_STATE_INPROGR) +#define set_op_state_serviced(op) ((op)->op_state = OP_VFS_STATE_SERVICED) +#define set_op_state_purged(op) ((op)->op_state |= OP_VFS_STATE_PURGED) + +#define op_state_waiting(op) ((op)->op_state & OP_VFS_STATE_WAITING) +#define op_state_in_progress(op) ((op)->op_state & OP_VFS_STATE_INPROGR) +#define op_state_serviced(op) ((op)->op_state & OP_VFS_STATE_SERVICED) +#define op_state_purged(op) ((op)->op_state & OP_VFS_STATE_PURGED) + +#define get_op(op) \ + do { \ + atomic_inc(&(op)->aio_ref_count); \ + gossip_debug(GOSSIP_DEV_DEBUG, \ + "(get) Alloced OP (%p:%llu)\n", \ + op, \ + llu((op)->tag)); \ + } while (0) + +#define put_op(op) \ + do { \ + if (atomic_sub_and_test(1, &(op)->aio_ref_count) == 1) { \ + gossip_debug(GOSSIP_DEV_DEBUG, \ + "(put) Releasing OP (%p:%llu)\n", \ + op, \ + llu((op)->tag)); \ + op_release(op); \ + } \ + } while (0) + +#define op_wait(op) (atomic_read(&(op)->aio_ref_count) <= 2 ? 0 : 1) + +/* + * Defines for controlling whether I/O upcalls are for async or sync operations + */ +enum ORANGEFS_async_io_type { + ORANGEFS_VFS_SYNC_IO = 0, + ORANGEFS_VFS_ASYNC_IO = 1, +}; + +/* + * An array of client_debug_mask will be built to hold debug keyword/mask + * values fetched from userspace. + */ +struct client_debug_mask { + char *keyword; + __u64 mask1; + __u64 mask2; +}; + +/* + * orangefs kernel memory related flags + */ + +#if ((defined ORANGEFS_KERNEL_DEBUG) && (defined CONFIG_DEBUG_SLAB)) +#define ORANGEFS_CACHE_CREATE_FLAGS SLAB_RED_ZONE +#else +#define ORANGEFS_CACHE_CREATE_FLAGS 0 +#endif /* ((defined ORANGEFS_KERNEL_DEBUG) && (defined CONFIG_DEBUG_SLAB)) */ + +#define ORANGEFS_CACHE_ALLOC_FLAGS (GFP_KERNEL) +#define ORANGEFS_GFP_FLAGS (GFP_KERNEL) +#define ORANGEFS_BUFMAP_GFP_FLAGS (GFP_KERNEL) + +/* orangefs xattr and acl related defines */ +#define ORANGEFS_XATTR_INDEX_POSIX_ACL_ACCESS 1 +#define ORANGEFS_XATTR_INDEX_POSIX_ACL_DEFAULT 2 +#define ORANGEFS_XATTR_INDEX_TRUSTED 3 +#define ORANGEFS_XATTR_INDEX_DEFAULT 4 + +#if 0 +#ifndef POSIX_ACL_XATTR_ACCESS +#define POSIX_ACL_XATTR_ACCESS "system.posix_acl_access" +#endif +#ifndef POSIX_ACL_XATTR_DEFAULT +#define POSIX_ACL_XATTR_DEFAULT "system.posix_acl_default" +#endif +#endif + +#define ORANGEFS_XATTR_NAME_ACL_ACCESS POSIX_ACL_XATTR_ACCESS +#define ORANGEFS_XATTR_NAME_ACL_DEFAULT POSIX_ACL_XATTR_DEFAULT +#define ORANGEFS_XATTR_NAME_TRUSTED_PREFIX "trusted." +#define ORANGEFS_XATTR_NAME_DEFAULT_PREFIX "" + +/* these functions are defined in orangefs-utils.c */ +int orangefs_prepare_cdm_array(char *debug_array_string); +int orangefs_prepare_debugfs_help_string(int); + +/* defined in orangefs-debugfs.c */ +int orangefs_client_debug_init(void); + +void debug_string_to_mask(char *, void *, int); +void do_c_mask(int, char *, struct client_debug_mask **); +void do_k_mask(int, char *, __u64 **); + +void debug_mask_to_string(void *, int); +void do_k_string(void *, int); +void do_c_string(void *, int); +int check_amalgam_keyword(void *, int); +int keyword_is_amalgam(char *); + +/*these variables are defined in orangefs-mod.c */ +extern char kernel_debug_string[ORANGEFS_MAX_DEBUG_STRING_LEN]; +extern char client_debug_string[ORANGEFS_MAX_DEBUG_STRING_LEN]; +extern char client_debug_array_string[ORANGEFS_MAX_DEBUG_STRING_LEN]; +extern unsigned int kernel_mask_set_mod_init; + +extern int orangefs_init_acl(struct inode *inode, struct inode *dir); +extern const struct xattr_handler *orangefs_xattr_handlers[]; + +extern struct posix_acl *orangefs_get_acl(struct inode *inode, int type); +extern int orangefs_set_acl(struct inode *inode, struct posix_acl *acl, int type); + +/* + * Redefine xtvec structure so that we could move helper functions out of + * the define + */ +struct xtvec { + __kernel_off_t xtv_off; /* must be off_t */ + __kernel_size_t xtv_len; /* must be size_t */ +}; + +/* + * orangefs data structures + */ +struct orangefs_kernel_op_s { + enum orangefs_vfs_op_states op_state; + __u64 tag; + + /* + * Set uses_shared_memory to 1 if this operation uses shared memory. + * If true, then a retry on the op must also get a new shared memory + * buffer and re-populate it. + */ + int uses_shared_memory; + + struct orangefs_upcall_s upcall; + struct orangefs_downcall_s downcall; + + wait_queue_head_t waitq; + spinlock_t lock; + + int io_completed; + wait_queue_head_t io_completion_waitq; + + /* VFS aio fields */ + + /* used by the async I/O code to stash the orangefs_kiocb_s structure */ + void *priv; + + /* used again for the async I/O code for deallocation */ + atomic_t aio_ref_count; + + int attempts; + + struct list_head list; +}; + +/* per inode private orangefs info */ +struct orangefs_inode_s { + struct orangefs_object_kref refn; + char link_target[ORANGEFS_NAME_MAX]; + __s64 blksize; + /* + * Reading/Writing Extended attributes need to acquire the appropriate + * reader/writer semaphore on the orangefs_inode_s structure. + */ + struct rw_semaphore xattr_sem; + + struct inode vfs_inode; + sector_t last_failed_block_index_read; + + /* + * State of in-memory attributes not yet flushed to disk associated + * with this object + */ + unsigned long pinode_flags; + + /* All allocated orangefs_inode_s objects are chained to a list */ + struct list_head list; +}; + +#define P_ATIME_FLAG 0 +#define P_MTIME_FLAG 1 +#define P_CTIME_FLAG 2 +#define P_MODE_FLAG 3 + +#define ClearAtimeFlag(pinode) clear_bit(P_ATIME_FLAG, &(pinode)->pinode_flags) +#define SetAtimeFlag(pinode) set_bit(P_ATIME_FLAG, &(pinode)->pinode_flags) +#define AtimeFlag(pinode) test_bit(P_ATIME_FLAG, &(pinode)->pinode_flags) + +#define ClearMtimeFlag(pinode) clear_bit(P_MTIME_FLAG, &(pinode)->pinode_flags) +#define SetMtimeFlag(pinode) set_bit(P_MTIME_FLAG, &(pinode)->pinode_flags) +#define MtimeFlag(pinode) test_bit(P_MTIME_FLAG, &(pinode)->pinode_flags) + +#define ClearCtimeFlag(pinode) clear_bit(P_CTIME_FLAG, &(pinode)->pinode_flags) +#define SetCtimeFlag(pinode) set_bit(P_CTIME_FLAG, &(pinode)->pinode_flags) +#define CtimeFlag(pinode) test_bit(P_CTIME_FLAG, &(pinode)->pinode_flags) + +#define ClearModeFlag(pinode) clear_bit(P_MODE_FLAG, &(pinode)->pinode_flags) +#define SetModeFlag(pinode) set_bit(P_MODE_FLAG, &(pinode)->pinode_flags) +#define ModeFlag(pinode) test_bit(P_MODE_FLAG, &(pinode)->pinode_flags) + +/* per superblock private orangefs info */ +struct orangefs_sb_info_s { + struct orangefs_khandle root_khandle; + __s32 fs_id; + int id; + int flags; +#define ORANGEFS_OPT_INTR 0x01 +#define ORANGEFS_OPT_LOCAL_LOCK 0x02 + char devname[ORANGEFS_MAX_SERVER_ADDR_LEN]; + struct super_block *sb; + int mount_pending; + struct list_head list; +}; + +/* + * structure that holds the state of any async I/O operation issued + * through the VFS. Needed especially to handle cancellation requests + * or even completion notification so that the VFS client-side daemon + * can free up its vfs_request slots. + */ +struct orangefs_kiocb_s { + /* the pointer to the task that initiated the AIO */ + struct task_struct *tsk; + + /* pointer to the kiocb that kicked this operation */ + struct kiocb *kiocb; + + /* buffer index that was used for the I/O */ + struct orangefs_bufmap *bufmap; + int buffer_index; + + /* orangefs kernel operation type */ + struct orangefs_kernel_op_s *op; + + /* The user space buffers from/to which I/O is being staged */ + struct iovec *iov; + + /* number of elements in the iovector */ + unsigned long nr_segs; + + /* set to indicate the type of the operation */ + int rw; + + /* file offset */ + loff_t offset; + + /* and the count in bytes */ + size_t bytes_to_be_copied; + + ssize_t bytes_copied; + int needs_cleanup; +}; + +struct orangefs_stats { + unsigned long cache_hits; + unsigned long cache_misses; + unsigned long reads; + unsigned long writes; +}; + +extern struct orangefs_stats g_orangefs_stats; + +/* + * NOTE: See Documentation/filesystems/porting for information + * on implementing FOO_I and properly accessing fs private data + */ +static inline struct orangefs_inode_s *ORANGEFS_I(struct inode *inode) +{ + return container_of(inode, struct orangefs_inode_s, vfs_inode); +} + +static inline struct orangefs_sb_info_s *ORANGEFS_SB(struct super_block *sb) +{ + return (struct orangefs_sb_info_s *) sb->s_fs_info; +} + +/* ino_t descends from "unsigned long", 8 bytes, 64 bits. */ +static inline ino_t orangefs_khandle_to_ino(struct orangefs_khandle *khandle) +{ + union { + unsigned char u[8]; + __u64 ino; + } ihandle; + + ihandle.u[0] = khandle->u[0] ^ khandle->u[4]; + ihandle.u[1] = khandle->u[1] ^ khandle->u[5]; + ihandle.u[2] = khandle->u[2] ^ khandle->u[6]; + ihandle.u[3] = khandle->u[3] ^ khandle->u[7]; + ihandle.u[4] = khandle->u[12] ^ khandle->u[8]; + ihandle.u[5] = khandle->u[13] ^ khandle->u[9]; + ihandle.u[6] = khandle->u[14] ^ khandle->u[10]; + ihandle.u[7] = khandle->u[15] ^ khandle->u[11]; + + return ihandle.ino; +} + +static inline struct orangefs_khandle *get_khandle_from_ino(struct inode *inode) +{ + return &(ORANGEFS_I(inode)->refn.khandle); +} + +static inline __s32 get_fsid_from_ino(struct inode *inode) +{ + return ORANGEFS_I(inode)->refn.fs_id; +} + +static inline ino_t get_ino_from_khandle(struct inode *inode) +{ + struct orangefs_khandle *khandle; + ino_t ino; + + khandle = get_khandle_from_ino(inode); + ino = orangefs_khandle_to_ino(khandle); + return ino; +} + +static inline ino_t get_parent_ino_from_dentry(struct dentry *dentry) +{ + return get_ino_from_khandle(dentry->d_parent->d_inode); +} + +static inline int is_root_handle(struct inode *inode) +{ + gossip_debug(GOSSIP_DCACHE_DEBUG, + "%s: root handle: %pU, this handle: %pU:\n", + __func__, + &ORANGEFS_SB(inode->i_sb)->root_khandle, + get_khandle_from_ino(inode)); + + if (ORANGEFS_khandle_cmp(&(ORANGEFS_SB(inode->i_sb)->root_khandle), + get_khandle_from_ino(inode))) + return 0; + else + return 1; +} + +static inline int match_handle(struct orangefs_khandle resp_handle, + struct inode *inode) +{ + gossip_debug(GOSSIP_DCACHE_DEBUG, + "%s: one handle: %pU, another handle:%pU:\n", + __func__, + &resp_handle, + get_khandle_from_ino(inode)); + + if (ORANGEFS_khandle_cmp(&resp_handle, get_khandle_from_ino(inode))) + return 0; + else + return 1; +} + +/* + * defined in orangefs-cache.c + */ +int op_cache_initialize(void); +int op_cache_finalize(void); +struct orangefs_kernel_op_s *op_alloc(__s32 type); +char *get_opname_string(struct orangefs_kernel_op_s *new_op); +void op_release(struct orangefs_kernel_op_s *op); + +int dev_req_cache_initialize(void); +int dev_req_cache_finalize(void); +void *dev_req_alloc(void); +void dev_req_release(void *); + +int orangefs_inode_cache_initialize(void); +int orangefs_inode_cache_finalize(void); + +int kiocb_cache_initialize(void); +int kiocb_cache_finalize(void); +struct orangefs_kiocb_s *kiocb_alloc(void); +void kiocb_release(struct orangefs_kiocb_s *ptr); + +/* + * defined in orangefs-mod.c + */ +void purge_inprogress_ops(void); + +/* + * defined in waitqueue.c + */ +int wait_for_matching_downcall(struct orangefs_kernel_op_s *op); +int wait_for_cancellation_downcall(struct orangefs_kernel_op_s *op); +void orangefs_clean_up_interrupted_operation(struct orangefs_kernel_op_s *op); +void purge_waiting_ops(void); + +/* + * defined in super.c + */ +struct dentry *orangefs_mount(struct file_system_type *fst, + int flags, + const char *devname, + void *data); + +void orangefs_kill_sb(struct super_block *sb); +int orangefs_remount(struct super_block *sb); + +int fsid_key_table_initialize(void); +void fsid_key_table_finalize(void); + +/* + * defined in inode.c + */ +__u32 convert_to_orangefs_mask(unsigned long lite_mask); +struct inode *orangefs_new_inode(struct super_block *sb, + struct inode *dir, + int mode, + dev_t dev, + struct orangefs_object_kref *ref); + +int orangefs_setattr(struct dentry *dentry, struct iattr *iattr); + +int orangefs_getattr(struct vfsmount *mnt, + struct dentry *dentry, + struct kstat *kstat); + +/* + * defined in xattr.c + */ +int orangefs_setxattr(struct dentry *dentry, + const char *name, + const void *value, + size_t size, + int flags); + +ssize_t orangefs_getxattr(struct dentry *dentry, + const char *name, + void *buffer, + size_t size); + +ssize_t orangefs_listxattr(struct dentry *dentry, char *buffer, size_t size); + +/* + * defined in namei.c + */ +struct inode *orangefs_iget(struct super_block *sb, + struct orangefs_object_kref *ref); + +ssize_t orangefs_inode_read(struct inode *inode, + struct iov_iter *iter, + loff_t *offset, + loff_t readahead_size); + +/* + * defined in devorangefs-req.c + */ +int orangefs_dev_init(void); +void orangefs_dev_cleanup(void); +int is_daemon_in_service(void); +int fs_mount_pending(__s32 fsid); + +/* + * defined in orangefs-utils.c + */ +__s32 fsid_of_op(struct orangefs_kernel_op_s *op); + +int orangefs_flush_inode(struct inode *inode); + +ssize_t orangefs_inode_getxattr(struct inode *inode, + const char *prefix, + const char *name, + void *buffer, + size_t size); + +int orangefs_inode_setxattr(struct inode *inode, + const char *prefix, + const char *name, + const void *value, + size_t size, + int flags); + +int orangefs_inode_getattr(struct inode *inode, __u32 mask); + +int orangefs_inode_setattr(struct inode *inode, struct iattr *iattr); + +void orangefs_op_initialize(struct orangefs_kernel_op_s *op); + +void orangefs_make_bad_inode(struct inode *inode); + +void block_signals(sigset_t *); + +void set_signals(sigset_t *); + +int orangefs_unmount_sb(struct super_block *sb); + +int orangefs_cancel_op_in_progress(__u64 tag); + +static inline __u64 orangefs_convert_time_field(const struct timespec *ts) +{ + return (__u64)ts->tv_sec; +} + +int orangefs_normalize_to_errno(__s32 error_code); + +extern struct mutex devreq_mutex; +extern struct mutex request_mutex; +extern int debug; +extern int op_timeout_secs; +extern int slot_timeout_secs; +extern struct list_head orangefs_superblocks; +extern spinlock_t orangefs_superblocks_lock; +extern struct list_head orangefs_request_list; +extern spinlock_t orangefs_request_list_lock; +extern wait_queue_head_t orangefs_request_list_waitq; +extern struct list_head *htable_ops_in_progress; +extern spinlock_t htable_ops_in_progress_lock; +extern int hash_table_size; + +extern const struct address_space_operations orangefs_address_operations; +extern struct backing_dev_info orangefs_backing_dev_info; +extern struct inode_operations orangefs_file_inode_operations; +extern const struct file_operations orangefs_file_operations; +extern struct inode_operations orangefs_symlink_inode_operations; +extern struct inode_operations orangefs_dir_inode_operations; +extern const struct file_operations orangefs_dir_operations; +extern const struct dentry_operations orangefs_dentry_operations; +extern const struct file_operations orangefs_devreq_file_operations; + +extern wait_queue_head_t orangefs_bufmap_init_waitq; + +/* + * misc convenience macros + */ +#define add_op_to_request_list(op) \ +do { \ + spin_lock(&orangefs_request_list_lock); \ + spin_lock(&op->lock); \ + set_op_state_waiting(op); \ + list_add_tail(&op->list, &orangefs_request_list); \ + spin_unlock(&orangefs_request_list_lock); \ + spin_unlock(&op->lock); \ + wake_up_interruptible(&orangefs_request_list_waitq); \ +} while (0) + +#define add_priority_op_to_request_list(op) \ + do { \ + spin_lock(&orangefs_request_list_lock); \ + spin_lock(&op->lock); \ + set_op_state_waiting(op); \ + \ + list_add(&op->list, &orangefs_request_list); \ + spin_unlock(&orangefs_request_list_lock); \ + spin_unlock(&op->lock); \ + wake_up_interruptible(&orangefs_request_list_waitq); \ +} while (0) + +#define remove_op_from_request_list(op) \ + do { \ + struct list_head *tmp = NULL; \ + struct list_head *tmp_safe = NULL; \ + struct orangefs_kernel_op_s *tmp_op = NULL; \ + \ + spin_lock(&orangefs_request_list_lock); \ + list_for_each_safe(tmp, tmp_safe, &orangefs_request_list) { \ + tmp_op = list_entry(tmp, \ + struct orangefs_kernel_op_s, \ + list); \ + if (tmp_op && (tmp_op == op)) { \ + list_del(&tmp_op->list); \ + break; \ + } \ + } \ + spin_unlock(&orangefs_request_list_lock); \ + } while (0) + +#define ORANGEFS_OP_INTERRUPTIBLE 1 /* service_operation() is interruptible */ +#define ORANGEFS_OP_PRIORITY 2 /* service_operation() is high priority */ +#define ORANGEFS_OP_CANCELLATION 4 /* this is a cancellation */ +#define ORANGEFS_OP_NO_SEMAPHORE 8 /* don't acquire semaphore */ +#define ORANGEFS_OP_ASYNC 16 /* Queue it, but don't wait */ + +int service_operation(struct orangefs_kernel_op_s *op, + const char *op_name, + int flags); + +/* + * handles two possible error cases, depending on context. + * + * by design, our vfs i/o errors need to be handled in one of two ways, + * depending on where the error occured. + * + * if the error happens in the waitqueue code because we either timed + * out or a signal was raised while waiting, we need to cancel the + * userspace i/o operation and free the op manually. this is done to + * avoid having the device start writing application data to our shared + * bufmap pages without us expecting it. + * + * FIXME: POSSIBLE OPTIMIZATION: + * However, if we timed out or if we got a signal AND our upcall was never + * picked off the queue (i.e. we were in OP_VFS_STATE_WAITING), then we don't + * need to send a cancellation upcall. The way we can handle this is + * set error_exit to 2 in such cases and 1 whenever cancellation has to be + * sent and have handle_error + * take care of this situation as well.. + * + * if a orangefs sysint level error occured and i/o has been completed, + * there is no need to cancel the operation, as the user has finished + * using the bufmap page and so there is no danger in this case. in + * this case, we wake up the device normally so that it may free the + * op, as normal. + * + * note the only reason this is a macro is because both read and write + * cases need the exact same handling code. + */ +#define handle_io_error() \ +do { \ + if (!op_state_serviced(new_op)) { \ + orangefs_cancel_op_in_progress(new_op->tag); \ + op_release(new_op); \ + } else { \ + wake_up_daemon_for_return(new_op); \ + } \ + new_op = NULL; \ + orangefs_bufmap_put(bufmap, buffer_index); \ + buffer_index = -1; \ +} while (0) + +#define get_interruptible_flag(inode) \ + ((ORANGEFS_SB(inode->i_sb)->flags & ORANGEFS_OPT_INTR) ? \ + ORANGEFS_OP_INTERRUPTIBLE : 0) + +#define add_orangefs_sb(sb) \ +do { \ + gossip_debug(GOSSIP_SUPER_DEBUG, \ + "Adding SB %p to orangefs superblocks\n", \ + ORANGEFS_SB(sb)); \ + spin_lock(&orangefs_superblocks_lock); \ + list_add_tail(&ORANGEFS_SB(sb)->list, &orangefs_superblocks); \ + spin_unlock(&orangefs_superblocks_lock); \ +} while (0) + +#define remove_orangefs_sb(sb) \ +do { \ + struct list_head *tmp = NULL; \ + struct list_head *tmp_safe = NULL; \ + struct orangefs_sb_info_s *orangefs_sb = NULL; \ + \ + spin_lock(&orangefs_superblocks_lock); \ + list_for_each_safe(tmp, tmp_safe, &orangefs_superblocks) { \ + orangefs_sb = list_entry(tmp, \ + struct orangefs_sb_info_s, \ + list); \ + if (orangefs_sb && (orangefs_sb->sb == sb)) { \ + gossip_debug(GOSSIP_SUPER_DEBUG, \ + "Removing SB %p from orangefs superblocks\n", \ + orangefs_sb); \ + list_del(&orangefs_sb->list); \ + break; \ + } \ + } \ + spin_unlock(&orangefs_superblocks_lock); \ +} while (0) + +#define orangefs_lock_inode(inode) spin_lock(&inode->i_lock) +#define orangefs_unlock_inode(inode) spin_unlock(&inode->i_lock) + +#define fill_default_sys_attrs(sys_attr, type, mode) \ +do { \ + sys_attr.owner = from_kuid(current_user_ns(), current_fsuid()); \ + sys_attr.group = from_kgid(current_user_ns(), current_fsgid()); \ + sys_attr.size = 0; \ + sys_attr.perms = ORANGEFS_util_translate_mode(mode); \ + sys_attr.objtype = type; \ + sys_attr.mask = ORANGEFS_ATTR_SYS_ALL_SETABLE; \ +} while (0) + +#define orangefs_inode_lock(__i) mutex_lock(&(__i)->i_mutex) + +#define orangefs_inode_unlock(__i) mutex_unlock(&(__i)->i_mutex) + +static inline void orangefs_i_size_write(struct inode *inode, loff_t i_size) +{ +#if BITS_PER_LONG == 32 && defined(CONFIG_SMP) + ornagefs_inode_lock(inode); +#endif + i_size_write(inode, i_size); +#if BITS_PER_LONG == 32 && defined(CONFIG_SMP) + orangefs_inode_unlock(inode); +#endif +} + +static inline unsigned int diff(struct timeval *end, struct timeval *begin) +{ + if (end->tv_usec < begin->tv_usec) { + end->tv_usec += 1000000; + end->tv_sec--; + } + end->tv_sec -= begin->tv_sec; + end->tv_usec -= begin->tv_usec; + return (end->tv_sec * 1000000) + end->tv_usec; +} + +#endif /* __ORANGEFSKERNEL_H */ |
