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/*
Copyright (c) 2012 Red Hat, Inc. <http://www.redhat.com>
This file is part of GlusterFS.
This file is licensed to you under your choice of the GNU Lesser
General Public License, version 3 or any later version (LGPLv3 or
later), or the GNU General Public License, version 2 (GPLv2), in all
cases as published by the Free Software Foundation.
*/
#ifndef _GLFS_INTERNAL_H
#define _GLFS_INTERNAL_H
#include "xlator.h"
#define GLFS_SYMLINK_MAX_FOLLOW 2048
#define DEFAULT_REVAL_COUNT 1
/*
* syncop_xxx() calls are executed in two ways, one is inside a synctask where
* the executing function will do 'swapcontext' and the other is without
* synctask where the executing thread is made to wait using pthread_cond_wait.
* Executing thread may change when syncop_xxx() is executed inside a synctask.
* This leads to errno_location change i.e. errno may give errno of
* non-executing thread. So errno is not touched inside a synctask execution.
* All gfapi calls are executed using the second way of executing syncop_xxx()
* where the executing thread waits using pthread_cond_wait so it is ok to set
* errno in these cases. The following macro makes syncop_xxx() behave just
* like a system call, where -1 is returned and errno is set when a failure
* occurs.
*/
#define DECODE_SYNCOP_ERR(ret) do { \
if (ret < 0) { \
errno = -ret; \
ret = -1; \
} \
} while (0)
#define ESTALE_RETRY(ret,errno,reval,loc,label) do { \
if (ret == -1 && errno == ESTALE) { \
if (reval < DEFAULT_REVAL_COUNT) { \
reval++; \
loc_wipe (loc); \
goto label; \
} \
} \
} while (0)
#define GLFS_LOC_FILL_INODE(oinode, loc, label) do { \
loc.inode = inode_ref (oinode); \
uuid_copy (loc.gfid, oinode->gfid); \
ret = glfs_loc_touchup (&loc); \
if (ret != 0) { \
errno = EINVAL; \
goto label; \
} \
} while (0)
#define GLFS_LOC_FILL_PINODE(pinode, loc, ret, errno, label, path) do { \
loc.inode = inode_new (pinode->table); \
if (!loc.inode) { \
ret = -1; \
errno = ENOMEM; \
goto label; \
} \
loc.parent = inode_ref (pinode); \
loc.name = path; \
ret = glfs_loc_touchup (&loc); \
if (ret != 0) { \
errno = EINVAL; \
goto label; \
} \
} while (0)
struct glfs;
typedef int (*glfs_init_cbk) (struct glfs *fs, int ret);
struct glfs {
char *volname;
glusterfs_ctx_t *ctx;
pthread_t poller;
glfs_init_cbk init_cbk;
pthread_mutex_t mutex;
pthread_cond_t cond;
int init;
int ret;
int err;
xlator_t *active_subvol;
xlator_t *next_subvol;
xlator_t *old_subvol;
char *oldvolfile;
ssize_t oldvollen;
inode_t *cwd;
uint32_t dev_id; /* Used to fill st_dev in struct stat */
struct list_head openfds;
gf_boolean_t migration_in_progress;
};
struct glfs_fd {
struct list_head openfds;
struct glfs *fs;
off_t offset;
fd_t *fd; /* Currently guared by @fs->mutex. TODO: per-glfd lock */
struct list_head entries;
gf_dirent_t *next;
struct dirent *readdirbuf;
};
/* glfs object handle introduced for the alternate gfapi implementation based
on glfs handles/gfid/inode
*/
struct glfs_object {
inode_t *inode;
uuid_t gfid;
};
#define DEFAULT_EVENT_POOL_SIZE 16384
#define GF_MEMPOOL_COUNT_OF_DICT_T 4096
#define GF_MEMPOOL_COUNT_OF_DATA_T (GF_MEMPOOL_COUNT_OF_DICT_T * 4)
#define GF_MEMPOOL_COUNT_OF_DATA_PAIR_T (GF_MEMPOOL_COUNT_OF_DICT_T * 4)
int glfs_mgmt_init (struct glfs *fs);
void glfs_init_done (struct glfs *fs, int ret);
int glfs_process_volfp (struct glfs *fs, FILE *fp);
int glfs_resolve (struct glfs *fs, xlator_t *subvol, const char *path, loc_t *loc,
struct iatt *iatt, int reval);
int glfs_lresolve (struct glfs *fs, xlator_t *subvol, const char *path, loc_t *loc,
struct iatt *iatt, int reval);
fd_t *glfs_resolve_fd (struct glfs *fs, xlator_t *subvol, struct glfs_fd *glfd);
fd_t *__glfs_migrate_fd (struct glfs *fs, xlator_t *subvol, struct glfs_fd *glfd);
int glfs_first_lookup (xlator_t *subvol);
static inline void
__glfs_entry_fs (struct glfs *fs)
{
THIS = fs->ctx->master;
}
static inline void
__glfs_entry_fd (struct glfs_fd *fd)
{
THIS = fd->fd->inode->table->xl->ctx->master;
}
/*
By default all lock attempts from user context must
use glfs_lock() and glfs_unlock(). This allows
for a safe implementation of graph migration where
we can give up the mutex during syncop calls so
that bottom up calls (particularly CHILD_UP notify)
can do a mutex_lock() on @glfs without deadlocking
the filesystem
*/
static inline int
glfs_lock (struct glfs *fs)
{
pthread_mutex_lock (&fs->mutex);
while (!fs->init)
pthread_cond_wait (&fs->cond, &fs->mutex);
while (fs->migration_in_progress)
pthread_cond_wait (&fs->cond, &fs->mutex);
return 0;
}
static inline void
glfs_unlock (struct glfs *fs)
{
pthread_mutex_unlock (&fs->mutex);
}
void glfs_fd_destroy (struct glfs_fd *glfd);
struct glfs_fd *glfs_fd_new (struct glfs *fs);
void glfs_fd_bind (struct glfs_fd *glfd);
xlator_t * glfs_active_subvol (struct glfs *fs);
xlator_t * __glfs_active_subvol (struct glfs *fs);
void glfs_subvol_done (struct glfs *fs, xlator_t *subvol);
inode_t * glfs_refresh_inode (xlator_t *subvol, inode_t *inode);
inode_t *glfs_cwd_get (struct glfs *fs);
int glfs_cwd_set (struct glfs *fs, inode_t *inode);
inode_t *glfs_resolve_inode (struct glfs *fs, xlator_t *subvol,
struct glfs_object *object);
int glfs_create_object (loc_t *loc, struct glfs_object **retobject);
int __glfs_cwd_set (struct glfs *fs, inode_t *inode);
int glfs_resolve_base (struct glfs *fs, xlator_t *subvol, inode_t *inode,
struct iatt *iatt);
int glfs_resolve_at (struct glfs *fs, xlator_t *subvol, inode_t *at,
const char *origpath, loc_t *loc, struct iatt *iatt,
int follow, int reval);
int glfs_loc_touchup (loc_t *loc);
void glfs_iatt_to_stat (struct glfs *fs, struct iatt *iatt, struct stat *stat);
int glfs_loc_link (loc_t *loc, struct iatt *iatt);
int glfs_loc_unlink (loc_t *loc);
#endif /* !_GLFS_INTERNAL_H */
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