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Diffstat (limited to 'src/include/cephfs/libcephfs.h')
| -rw-r--r-- | src/include/cephfs/libcephfs.h | 2126 |
1 files changed, 2126 insertions, 0 deletions
diff --git a/src/include/cephfs/libcephfs.h b/src/include/cephfs/libcephfs.h new file mode 100644 index 000000000..185d5e40e --- /dev/null +++ b/src/include/cephfs/libcephfs.h @@ -0,0 +1,2126 @@ +// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- +// vim: ts=8 sw=2 smarttab +/* + * Ceph - scalable distributed file system + * + * Copyright (C) 2009-2011 New Dream Network + * + * This is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License version 2.1, as published by the Free Software + * Foundation. See file COPYING. + * + */ + +#ifndef CEPH_LIB_H +#define CEPH_LIB_H + +#if defined(__linux__) +#include <features.h> +#endif +#include <utime.h> +#include <sys/stat.h> +#include <sys/types.h> +#include <sys/statvfs.h> +#include <sys/socket.h> +#include <stdint.h> +#include <stdbool.h> +#include <fcntl.h> + +#include "ceph_ll_client.h" + +#ifdef __cplusplus +namespace ceph::common { + class CephContext; +} +using CephContext = ceph::common::CephContext; +extern "C" { +#endif + +#define LIBCEPHFS_VER_MAJOR 10 +#define LIBCEPHFS_VER_MINOR 0 +#define LIBCEPHFS_VER_EXTRA 2 + +#define LIBCEPHFS_VERSION(maj, min, extra) ((maj << 16) + (min << 8) + extra) +#define LIBCEPHFS_VERSION_CODE LIBCEPHFS_VERSION(LIBCEPHFS_VER_MAJOR, LIBCEPHFS_VER_MINOR, LIBCEPHFS_VER_EXTRA) + +#if __GNUC__ >= 4 + #define LIBCEPHFS_DEPRECATED __attribute__((deprecated)) + #pragma GCC diagnostic push + #pragma GCC diagnostic ignored "-Wdeprecated-declarations" +#else + #define LIBCEPHFS_DEPRECATED +#endif + +/* + * If using glibc check that file offset is 64-bit. + */ +#if defined(__GLIBC__) && !defined(__USE_FILE_OFFSET64) +# error libceph: glibc must define __USE_FILE_OFFSET64 or readdir results will be corrupted +#endif + +/* + * XXXX redeclarations from ceph_fs.h, rados.h, etc. We need more of this + * in the interface, but shouldn't be re-typing it (and using different + * C data types). + */ +#ifndef __cplusplus + +#define CEPH_INO_ROOT 1 +#define CEPH_NOSNAP ((uint64_t)(-2)) + +struct ceph_file_layout { + /* file -> object mapping */ + uint32_t fl_stripe_unit; /* stripe unit, in bytes. must be multiple + of page size. */ + uint32_t fl_stripe_count; /* over this many objects */ + uint32_t fl_object_size; /* until objects are this big, then move to + new objects */ + uint32_t fl_cas_hash; /* 0 = none; 1 = sha256 */ + + /* pg -> disk layout */ + uint32_t fl_object_stripe_unit; /* for per-object parity, if any */ + + /* object -> pg layout */ + uint32_t fl_pg_preferred; /* preferred primary for pg (-1 for none) */ + uint32_t fl_pg_pool; /* namespace, crush ruleset, rep level */ +} __attribute__ ((packed)); + +struct CephContext; +#endif /* ! __cplusplus */ + +struct UserPerm; +typedef struct UserPerm UserPerm; + +struct Inode; +typedef struct Inode Inode; + +struct ceph_mount_info; +struct ceph_dir_result; + +// user supplied key,value pair to be associated with a snapshot. +// callers can supply an array of this struct via ceph_mksnap(). +struct snap_metadata { + const char *key; + const char *value; +}; + +struct snap_info { + uint64_t id; + size_t nr_snap_metadata; + struct snap_metadata *snap_metadata; +}; + +/* setattr mask bits */ +#ifndef CEPH_SETATTR_MODE +# define CEPH_SETATTR_MODE 1 +# define CEPH_SETATTR_UID 2 +# define CEPH_SETATTR_GID 4 +# define CEPH_SETATTR_MTIME 8 +# define CEPH_SETATTR_ATIME 16 +# define CEPH_SETATTR_SIZE 32 +# define CEPH_SETATTR_CTIME 64 +# define CEPH_SETATTR_MTIME_NOW 128 +# define CEPH_SETATTR_ATIME_NOW 256 +# define CEPH_SETATTR_BTIME 512 +#endif + +/* define error codes for the mount function*/ +# define CEPHFS_ERROR_MON_MAP_BUILD 1000 +# define CEPHFS_ERROR_NEW_CLIENT 1002 +# define CEPHFS_ERROR_MESSENGER_START 1003 + +/** + * Create a UserPerm credential object. + * + * Some calls (most notably, the ceph_ll_* ones), take a credential object + * that represents the credentials that the calling program is using. This + * function creates a new credential object for this purpose. Returns a + * pointer to the object, or NULL if it can't be allocated. + * + * Note that the gidlist array is used directly and is not copied. It must + * remain valid over the lifetime of the created UserPerm object. + * + * @param uid uid to be used + * @param gid gid to be used + * @param ngids number of gids in supplemental grouplist + * @param gidlist array of gid_t's in the list of groups + */ +UserPerm *ceph_userperm_new(uid_t uid, gid_t gid, int ngids, gid_t *gidlist); + +/** + * Destroy a UserPerm credential object. + * + * @param perm pointer to object to be destroyed + * + * Currently this just frees the object. Note that the gidlist array is not + * freed. The caller must do so if it's necessary. + */ +void ceph_userperm_destroy(UserPerm *perm); + +/** + * Get a pointer to the default UserPerm object for the mount. + * + * @param cmount the mount info handle + * + * Every cmount has a default set of credentials. This returns a pointer to + * that object. + * + * Unlike with ceph_userperm_new, this object should not be freed. + */ +struct UserPerm *ceph_mount_perms(struct ceph_mount_info *cmount); + +/** + * Set cmount's default permissions + * + * @param cmount the mount info handle + * @param perm permissions to set to default for mount + * + * Every cmount has a default set of credentials. This does a deep copy of + * the given permissions to the ones in the cmount. Must be done after + * ceph_init but before ceph_mount. + * + * Returns 0 on success, and -EISCONN if the cmount is already mounted. + */ +int ceph_mount_perms_set(struct ceph_mount_info *cmount, UserPerm *perm); + +/** + * @defgroup libcephfs_h_init Setup and Teardown + * These are the first and last functions that should be called + * when using libcephfs. + * + * @{ + */ + +/** + * Get the version of libcephfs. + * + * The version number is major.minor.patch. + * + * @param major where to store the major version number + * @param minor where to store the minor version number + * @param patch where to store the extra version number + */ +const char *ceph_version(int *major, int *minor, int *patch); + +/** + * Create a mount handle for interacting with Ceph. All libcephfs + * functions operate on a mount info handle. + * + * @param cmount the mount info handle to initialize + * @param id the id of the client. This can be a unique id that identifies + * this client, and will get appended onto "client.". Callers can + * pass in NULL, and the id will be the process id of the client. + * @returns 0 on success, negative error code on failure + */ +int ceph_create(struct ceph_mount_info **cmount, const char * const id); + +/** + * Create a mount handle from a CephContext, which holds the configuration + * for the ceph cluster. A CephContext can be acquired from an existing ceph_mount_info + * handle, using the @ref ceph_get_mount_context call. Note that using the same CephContext + * for two different mount handles results in the same client entity id being used. + * + * @param cmount the mount info handle to initialize + * @param conf reuse this pre-existing CephContext config + * @returns 0 on success, negative error code on failure + */ +#ifdef __cplusplus +int ceph_create_with_context(struct ceph_mount_info **cmount, CephContext *conf); +#else +int ceph_create_with_context(struct ceph_mount_info **cmount, struct CephContext *conf); +#endif + +#ifndef VOIDPTR_RADOS_T +#define VOIDPTR_RADOS_T +typedef void *rados_t; +#endif // VOIDPTR_RADOS_T + +/** + * Create a mount handle from a rados_t, for using libcephfs in the + * same process as librados. + * + * @param cmount the mount info handle to initialize + * @param cluster reference to already-initialized librados handle + * @returns 0 on success, negative error code on failure + */ +int ceph_create_from_rados(struct ceph_mount_info **cmount, rados_t cluster); + +/** + * Initialize the filesystem client (but do not mount the filesystem yet) + * + * @returns 0 on success, negative error code on failure + */ +int ceph_init(struct ceph_mount_info *cmount); + +/** + * Optionally set which filesystem to mount, before calling mount. + * + * An error will be returned if this libcephfs instance is already + * mounted. This function is an alternative to setting the global + * client_fs setting. Using this function enables multiple libcephfs + * instances in the same process to mount different filesystems. + * + * The filesystem name is *not* validated in this function. That happens + * during mount(), where an ENOENT error will result if a non-existent + * filesystem was specified here. + * + * @param cmount the mount info handle + * @returns 0 on success, negative error code on failure + */ +int ceph_select_filesystem(struct ceph_mount_info *cmount, const char *fs_name); + + +/** + * Perform a mount using the path for the root of the mount. + * + * It is optional to call ceph_init before this. If ceph_init has + * not already been called, it will be called in the course of this operation. + * + * @param cmount the mount info handle + * @param root the path for the root of the mount. This can be an existing + * directory within the ceph cluster, but most likely it will + * be "/". Passing in NULL is equivalent to "/". + * @returns 0 on success, negative error code on failure + */ +int ceph_mount(struct ceph_mount_info *cmount, const char *root); + +/** + * Return cluster ID for a mounted ceph filesystem + * + * Every ceph filesystem has a filesystem ID associated with it. This + * function returns that value. If the ceph_mount_info does not refer to a + * mounted filesystem, this returns a negative error code. + */ +int64_t ceph_get_fs_cid(struct ceph_mount_info *cmount); + +/** + * Execute a management command remotely on an MDS. + * + * Must have called ceph_init or ceph_mount before calling this. + * + * @param mds_spec string representing rank, MDS name, GID or '*' + * @param cmd array of null-terminated strings + * @param cmdlen length of cmd array + * @param inbuf non-null-terminated input data to command + * @param inbuflen length in octets of inbuf + * @param outbuf populated with pointer to buffer (command output data) + * @param outbuflen length of allocated outbuf + * @param outs populated with pointer to buffer (command error strings) + * @param outslen length of allocated outs + * + * @return 0 on success, negative error code on failure + * + */ +int ceph_mds_command(struct ceph_mount_info *cmount, + const char *mds_spec, + const char **cmd, + size_t cmdlen, + const char *inbuf, size_t inbuflen, + char **outbuf, size_t *outbuflen, + char **outs, size_t *outslen); + +/** + * Free a buffer, such as those used for output arrays from ceph_mds_command + */ +void ceph_buffer_free(char *buf); + +/** + * Unmount a mount handle. + * + * @param cmount the mount handle + * @return 0 on success, negative error code on failure + */ +int ceph_unmount(struct ceph_mount_info *cmount); + +/** + * Abort mds connections + * + * @param cmount the mount handle + * @return 0 on success, negative error code on failure + */ +int ceph_abort_conn(struct ceph_mount_info *cmount); + +/** + * Destroy the mount handle. + * + * The handle should not be mounted. This should be called on completion of + * all libcephfs functions. + * + * @param cmount the mount handle + * @return 0 on success, negative error code on failure. + */ +int ceph_release(struct ceph_mount_info *cmount); + +/** + * Deprecated. Unmount and destroy the ceph mount handle. This should be + * called on completion of all libcephfs functions. + * + * Equivalent to ceph_unmount() + ceph_release() without error handling. + * + * @param cmount the mount handle to shutdown + */ +void ceph_shutdown(struct ceph_mount_info *cmount); + +/** + * Return associated client addresses + * + * @param cmount the mount handle + * @param addrs the output addresses + * @returns 0 on success, a negative error code on failure + * @note the returned addrs should be free by the caller + */ +int ceph_getaddrs(struct ceph_mount_info *cmount, char** addrs); + +/** + * Get a global id for current instance + * + * The handle should not be mounted. This should be called on completion of + * all libcephfs functions. + * + * @param cmount the mount handle + * @returns instance global id + */ +uint64_t ceph_get_instance_id(struct ceph_mount_info *cmount); + +/** + * Extract the CephContext from the mount point handle. + * + * @param cmount the ceph mount handle to get the context from. + * @returns the CephContext associated with the mount handle. + */ +#ifdef __cplusplus +CephContext *ceph_get_mount_context(struct ceph_mount_info *cmount); +#else +struct CephContext *ceph_get_mount_context(struct ceph_mount_info *cmount); +#endif +/* + * Check mount status. + * + * Return non-zero value if mounted. Otherwise, zero. + */ +int ceph_is_mounted(struct ceph_mount_info *cmount); + +/** @} init */ + +/** + * @defgroup libcephfs_h_config Config + * Functions for manipulating the Ceph configuration at runtime. + * + * @{ + */ + +/** + * Load the ceph configuration from the specified config file. + * + * @param cmount the mount handle to load the configuration into. + * @param path_list the configuration file path + * @returns 0 on success, negative error code on failure + */ +int ceph_conf_read_file(struct ceph_mount_info *cmount, const char *path_list); + +/** + * Parse the command line arguments and load the configuration parameters. + * + * @param cmount the mount handle to load the configuration parameters into. + * @param argc count of the arguments in argv + * @param argv the argument list + * @returns 0 on success, negative error code on failure + */ +int ceph_conf_parse_argv(struct ceph_mount_info *cmount, int argc, const char **argv); + +/** + * Configure the cluster handle based on an environment variable + * + * The contents of the environment variable are parsed as if they were + * Ceph command line options. If var is NULL, the CEPH_ARGS + * environment variable is used. + * + * @pre ceph_mount() has not been called on the handle + * + * @note BUG: this is not threadsafe - it uses a static buffer + * + * @param cmount handle to configure + * @param var name of the environment variable to read + * @returns 0 on success, negative error code on failure + */ +int ceph_conf_parse_env(struct ceph_mount_info *cmount, const char *var); + +/** Sets a configuration value from a string. + * + * @param cmount the mount handle to set the configuration value on + * @param option the configuration option to set + * @param value the value of the configuration option to set + * + * @returns 0 on success, negative error code otherwise. + */ +int ceph_conf_set(struct ceph_mount_info *cmount, const char *option, const char *value); + +/** Set mount timeout. + * + * @param cmount mount handle to set the configuration value on + * @param timeout mount timeout interval + * + * @returns 0 on success, negative error code otherwise. + */ +int ceph_set_mount_timeout(struct ceph_mount_info *cmount, uint32_t timeout); + +/** + * Gets the configuration value as a string. + * + * @param cmount the mount handle to set the configuration value on + * @param option the config option to get + * @param buf the buffer to fill with the value + * @param len the length of the buffer. + * @returns the size of the buffer filled in with the value, or negative error code on failure + */ +int ceph_conf_get(struct ceph_mount_info *cmount, const char *option, char *buf, size_t len); + +/** @} config */ + +/** + * @defgroup libcephfs_h_fsops File System Operations. + * Functions for getting/setting file system wide information specific to a particular + * mount handle. + * + * @{ + */ + +/** + * Perform a statfs on the ceph file system. This call fills in file system wide statistics + * into the passed in buffer. + * + * @param cmount the ceph mount handle to use for performing the statfs. + * @param path can be any path within the mounted filesystem + * @param stbuf the file system statistics filled in by this function. + * @return 0 on success, negative error code otherwise. + */ +int ceph_statfs(struct ceph_mount_info *cmount, const char *path, struct statvfs *stbuf); + +/** + * Synchronize all filesystem data to persistent media. + * + * @param cmount the ceph mount handle to use for performing the sync_fs. + * @returns 0 on success or negative error code on failure. + */ +int ceph_sync_fs(struct ceph_mount_info *cmount); + +/** + * Get the current working directory. + * + * @param cmount the ceph mount to get the current working directory for. + * @returns the path to the current working directory + */ +const char* ceph_getcwd(struct ceph_mount_info *cmount); + +/** + * Change the current working directory. + * + * @param cmount the ceph mount to change the current working directory for. + * @param path the path to the working directory to change into. + * @returns 0 on success, negative error code otherwise. + */ +int ceph_chdir(struct ceph_mount_info *cmount, const char *path); + +/** @} fsops */ + +/** + * @defgroup libcephfs_h_dir Directory Operations. + * Functions for manipulating and listing directories. + * + * @{ + */ + +/** + * Open the given directory. + * + * @param cmount the ceph mount handle to use to open the directory + * @param name the path name of the directory to open. Must be either an absolute path + * or a path relative to the current working directory. + * @param dirpp the directory result pointer structure to fill in. + * @returns 0 on success or negative error code otherwise. + */ +int ceph_opendir(struct ceph_mount_info *cmount, const char *name, struct ceph_dir_result **dirpp); + +/** + * Open a directory referred to by a file descriptor + * + * @param cmount the ceph mount handle to use to open the directory + * @param dirfd open file descriptor for the directory + * @param dirpp the directory result pointer structure to fill in + * @returns 0 on success or negative error code otherwise + */ +int ceph_fdopendir(struct ceph_mount_info *cmount, int dirfd, struct ceph_dir_result **dirpp); + +/** + * Close the open directory. + * + * @param cmount the ceph mount handle to use for closing the directory + * @param dirp the directory result pointer (set by ceph_opendir) to close + * @returns 0 on success or negative error code on failure. + */ +int ceph_closedir(struct ceph_mount_info *cmount, struct ceph_dir_result *dirp); + +/** + * Get the next entry in an open directory. + * + * @param cmount the ceph mount handle to use for performing the readdir. + * @param dirp the directory stream pointer from an opendir holding the state of the + * next entry to return. + * @returns the next directory entry or NULL if at the end of the directory (or the directory + * is empty. This pointer should not be freed by the caller, and is only safe to + * access between return and the next call to ceph_readdir or ceph_closedir. + */ +struct dirent * ceph_readdir(struct ceph_mount_info *cmount, struct ceph_dir_result *dirp); + +/** + * A safe version of ceph_readdir, where the directory entry struct is allocated by the caller. + * + * @param cmount the ceph mount handle to use for performing the readdir. + * @param dirp the directory stream pointer from an opendir holding the state of the + * next entry to return. + * @param de the directory entry pointer filled in with the next directory entry of the dirp state. + * @returns 1 if the next entry was filled in, 0 if the end of the directory stream was reached, + * and a negative error code on failure. + */ +int ceph_readdir_r(struct ceph_mount_info *cmount, struct ceph_dir_result *dirp, struct dirent *de); + +/** + * A safe version of ceph_readdir that also returns the file statistics (readdir+stat). + * + * @param cmount the ceph mount handle to use for performing the readdir_plus_r. + * @param dirp the directory stream pointer from an opendir holding the state of the + * next entry to return. + * @param de the directory entry pointer filled in with the next directory entry of the dirp state. + * @param stx the stats of the file/directory of the entry returned + * @param want mask showing desired inode attrs for returned entry + * @param flags bitmask of flags to use when filling out attributes + * @param out optional returned Inode argument. If non-NULL, then a reference will be taken on + * the inode and the pointer set on success. + * @returns 1 if the next entry was filled in, 0 if the end of the directory stream was reached, + * and a negative error code on failure. + */ +int ceph_readdirplus_r(struct ceph_mount_info *cmount, struct ceph_dir_result *dirp, struct dirent *de, + struct ceph_statx *stx, unsigned want, unsigned flags, struct Inode **out); + +/** + * Gets multiple directory entries. + * + * @param cmount the ceph mount handle to use for performing the getdents. + * @param dirp the directory stream pointer from an opendir holding the state of the + * next entry/entries to return. + * @param name an array of struct dirent that gets filled in with the to fill returned directory entries into. + * @param buflen the length of the buffer, which should be the number of dirent structs * sizeof(struct dirent). + * @returns the length of the buffer that was filled in, will always be multiples of sizeof(struct dirent), or a + * negative error code. If the buffer is not large enough for a single entry, -ERANGE is returned. + */ +int ceph_getdents(struct ceph_mount_info *cmount, struct ceph_dir_result *dirp, char *name, int buflen); + +/** + * Gets multiple directory names. + * + * @param cmount the ceph mount handle to use for performing the getdents. + * @param dirp the directory stream pointer from an opendir holding the state of the + * next entry/entries to return. + * @param name a buffer to fill in with directory entry names. + * @param buflen the length of the buffer that can be filled in. + * @returns the length of the buffer filled in with entry names, or a negative error code on failure. + * If the buffer isn't large enough for a single entry, -ERANGE is returned. + */ +int ceph_getdnames(struct ceph_mount_info *cmount, struct ceph_dir_result *dirp, char *name, int buflen); + +/** + * Rewind the directory stream to the beginning of the directory. + * + * @param cmount the ceph mount handle to use for performing the rewinddir. + * @param dirp the directory stream pointer to rewind. + */ +void ceph_rewinddir(struct ceph_mount_info *cmount, struct ceph_dir_result *dirp); + +/** + * Get the current position of a directory stream. + * + * @param cmount the ceph mount handle to use for performing the telldir. + * @param dirp the directory stream pointer to get the current position of. + * @returns the position of the directory stream. Note that the offsets returned + * by ceph_telldir do not have a particular order (cannot be compared with + * inequality). + */ +int64_t ceph_telldir(struct ceph_mount_info *cmount, struct ceph_dir_result *dirp); + +/** + * Move the directory stream to a position specified by the given offset. + * + * @param cmount the ceph mount handle to use for performing the seekdir. + * @param dirp the directory stream pointer to move. + * @param offset the position to move the directory stream to. This offset should be + * a value returned by telldir. Note that this value does not refer to the nth + * entry in a directory, and can not be manipulated with plus or minus. + */ +void ceph_seekdir(struct ceph_mount_info *cmount, struct ceph_dir_result *dirp, int64_t offset); + +/** + * Create a directory. + * + * @param cmount the ceph mount handle to use for making the directory. + * @param path the path of the directory to create. This must be either an + * absolute path or a relative path off of the current working directory. + * @param mode the permissions the directory should have once created. + * @returns 0 on success or a negative return code on error. + */ +int ceph_mkdir(struct ceph_mount_info *cmount, const char *path, mode_t mode); + +/** + * Create a directory relative to a file descriptor + * + * @param cmount the ceph mount handle to use for making the directory. + * @param dirfd open file descriptor for a directory (or CEPHFS_AT_FDCWD) + * @param relpath the path of the directory to create. + * @param mode the permissions the directory should have once created. + * @returns 0 on success or a negative return code on error. + */ +int ceph_mkdirat(struct ceph_mount_info *cmount, int dirfd, const char *relpath, mode_t mode); + +/** + * Create a snapshot + * + * @param cmount the ceph mount handle to use for making the directory. + * @param path the path of the directory to create snapshot. This must be either an + * absolute path or a relative path off of the current working directory. + * @param name snapshot name + * @param mode the permissions the directory should have once created. + * @param snap_metadata array of snap metadata structs + * @param nr_snap_metadata number of snap metadata struct entries + * @returns 0 on success or a negative return code on error. + */ +int ceph_mksnap(struct ceph_mount_info *cmount, const char *path, const char *name, + mode_t mode, struct snap_metadata *snap_metadata, size_t nr_snap_metadata); + +/** + * Remove a snapshot + * + * @param cmount the ceph mount handle to use for making the directory. + * @param path the path of the directory to create snapshot. This must be either an + * absolute path or a relative path off of the current working directory. + * @param name snapshot name + * @returns 0 on success or a negative return code on error. + */ +int ceph_rmsnap(struct ceph_mount_info *cmount, const char *path, const char *name); + +/** + * Create multiple directories at once. + * + * @param cmount the ceph mount handle to use for making the directories. + * @param path the full path of directories and sub-directories that should + * be created. + * @param mode the permissions the directory should have once created. + * @returns 0 on success or a negative return code on error. + */ +int ceph_mkdirs(struct ceph_mount_info *cmount, const char *path, mode_t mode); + +/** + * Remove a directory. + * + * @param cmount the ceph mount handle to use for removing directories. + * @param path the path of the directory to remove. + * @returns 0 on success or a negative return code on error. + */ +int ceph_rmdir(struct ceph_mount_info *cmount, const char *path); + +/** @} dir */ + +/** + * @defgroup libcephfs_h_links Links and Link Handling. + * Functions for creating and manipulating hard links and symbolic inks. + * + * @{ + */ + +/** + * Create a link. + * + * @param cmount the ceph mount handle to use for creating the link. + * @param existing the path to the existing file/directory to link to. + * @param newname the path to the new file/directory to link from. + * @returns 0 on success or a negative return code on error. + */ +int ceph_link(struct ceph_mount_info *cmount, const char *existing, const char *newname); + +/** + * Read a symbolic link. + * + * @param cmount the ceph mount handle to use for creating the link. + * @param path the path to the symlink to read + * @param buf the buffer to hold the path of the file that the symlink points to. + * @param size the length of the buffer + * @returns number of bytes copied on success or negative error code on failure + */ +int ceph_readlink(struct ceph_mount_info *cmount, const char *path, char *buf, int64_t size); + +/** + * Read a symbolic link relative to a file descriptor + * + * @param cmount the ceph mount handle to use for creating the link. + * @param dirfd open file descriptor (or CEPHFS_AT_FDCWD) + * @param relpath the path to the symlink to read + * @param buf the buffer to hold the path of the file that the symlink points to. + * @param size the length of the buffer + * @returns number of bytes copied on success or negative error code on failure + */ +int ceph_readlinkat(struct ceph_mount_info *cmount, int dirfd, const char *relpath, char *buf, + int64_t size); + +/** + * Creates a symbolic link. + * + * @param cmount the ceph mount handle to use for creating the symbolic link. + * @param existing the path to the existing file/directory to link to. + * @param newname the path to the new file/directory to link from. + * @returns 0 on success or a negative return code on failure. + */ +int ceph_symlink(struct ceph_mount_info *cmount, const char *existing, const char *newname); + +/** + * Creates a symbolic link relative to a file descriptor + * + * @param cmount the ceph mount handle to use for creating the symbolic link. + * @param dirfd open file descriptor (or CEPHFS_AT_FDCWD) + * @param existing the path to the existing file/directory to link to. + * @param newname the path to the new file/directory to link from. + * @returns 0 on success or a negative return code on failure. + */ +int ceph_symlinkat(struct ceph_mount_info *cmount, const char *existing, int dirfd, + const char *newname); + +/** @} links */ + +/** + * @defgroup libcephfs_h_files File manipulation and handling. + * Functions for creating and manipulating files. + * + * @{ + */ + + +/** + * Checks if deleting a file, link or directory is allowed. + * + * @param cmount the ceph mount handle to use. + * @param path the path of the file, link or directory. + * @returns 0 on success or negative error code on failure. + */ +int ceph_may_delete(struct ceph_mount_info *cmount, const char *path); + +/** + * Removes a file, link, or symbolic link. If the file/link has multiple links to it, the + * file will not disappear from the namespace until all references to it are removed. + * + * @param cmount the ceph mount handle to use for performing the unlink. + * @param path the path of the file or link to unlink. + * @returns 0 on success or negative error code on failure. + */ +int ceph_unlink(struct ceph_mount_info *cmount, const char *path); + +/** + * Removes a file, link, or symbolic link relative to a file descriptor. + * If the file/link has multiple links to it, the file will not + * disappear from the namespace until all references to it are removed. + * + * @param cmount the ceph mount handle to use for performing the unlink. + * @param dirfd open file descriptor (or CEPHFS_AT_FDCWD) + * @param relpath the path of the file or link to unlink. + * @param flags bitfield that can be used to set AT_* modifier flags (only AT_REMOVEDIR) + * @returns 0 on success or negative error code on failure. + */ +int ceph_unlinkat(struct ceph_mount_info *cmount, int dirfd, const char *relpath, int flags); + +/** + * Rename a file or directory. + * + * @param cmount the ceph mount handle to use for performing the rename. + * @param from the path to the existing file or directory. + * @param to the new name of the file or directory + * @returns 0 on success or negative error code on failure. + */ +int ceph_rename(struct ceph_mount_info *cmount, const char *from, const char *to); + +/** + * Get an open file's extended statistics and attributes. + * + * @param cmount the ceph mount handle to use for performing the stat. + * @param fd the file descriptor of the file to get statistics of. + * @param stx the ceph_statx struct that will be filled in with the file's statistics. + * @param want bitfield of CEPH_STATX_* flags showing designed attributes + * @param flags bitfield that can be used to set AT_* modifier flags (AT_STATX_SYNC_AS_STAT, AT_STATX_FORCE_SYNC, AT_STATX_DONT_SYNC and AT_SYMLINK_NOFOLLOW) + * @returns 0 on success or negative error code on failure. + */ +int ceph_fstatx(struct ceph_mount_info *cmount, int fd, struct ceph_statx *stx, + unsigned int want, unsigned int flags); + +/** + * Get attributes of a file relative to a file descriptor + * + * @param cmount the ceph mount handle to use for performing the stat. + * @param dirfd open file descriptor (or CEPHFS_AT_FDCWD) + * @param relpath to the file/directory to get statistics of + * @param stx the ceph_statx struct that will be filled in with the file's statistics. + * @param want bitfield of CEPH_STATX_* flags showing designed attributes + * @param flags bitfield that can be used to set AT_* modifier flags (AT_STATX_SYNC_AS_STAT, AT_STATX_FORCE_SYNC, AT_STATX_DONT_SYNC and AT_SYMLINK_NOFOLLOW) + * @returns 0 on success or negative error code on failure. + */ +int ceph_statxat(struct ceph_mount_info *cmount, int dirfd, const char *relpath, + struct ceph_statx *stx, unsigned int want, unsigned int flags); + +/** + * Get a file's extended statistics and attributes. + * + * @param cmount the ceph mount handle to use for performing the stat. + * @param path the file or directory to get the statistics of. + * @param stx the ceph_statx struct that will be filled in with the file's statistics. + * @param want bitfield of CEPH_STATX_* flags showing designed attributes + * @param flags bitfield that can be used to set AT_* modifier flags (AT_STATX_SYNC_AS_STAT, AT_STATX_FORCE_SYNC, AT_STATX_DONT_SYNC and AT_SYMLINK_NOFOLLOW) + * @returns 0 on success or negative error code on failure. + */ +int ceph_statx(struct ceph_mount_info *cmount, const char *path, struct ceph_statx *stx, + unsigned int want, unsigned int flags); + +/** + * Get a file's statistics and attributes. + * + * ceph_stat() is deprecated, use ceph_statx() instead. + * + * @param cmount the ceph mount handle to use for performing the stat. + * @param path the file or directory to get the statistics of. + * @param stbuf the stat struct that will be filled in with the file's statistics. + * @returns 0 on success or negative error code on failure. + */ +int ceph_stat(struct ceph_mount_info *cmount, const char *path, struct stat *stbuf) + LIBCEPHFS_DEPRECATED; + +/** + * Get a file's statistics and attributes, without following symlinks. + * + * ceph_lstat() is deprecated, use ceph_statx(.., AT_SYMLINK_NOFOLLOW) instead. + * + * @param cmount the ceph mount handle to use for performing the stat. + * @param path the file or directory to get the statistics of. + * @param stbuf the stat struct that will be filled in with the file's statistics. + * @returns 0 on success or negative error code on failure. + */ +int ceph_lstat(struct ceph_mount_info *cmount, const char *path, struct stat *stbuf) + LIBCEPHFS_DEPRECATED; + +/** + * Get the open file's statistics. + * + * ceph_fstat() is deprecated, use ceph_fstatx() instead. + * + * @param cmount the ceph mount handle to use for performing the fstat. + * @param fd the file descriptor of the file to get statistics of. + * @param stbuf the stat struct of the file's statistics, filled in by the + * function. + * @returns 0 on success or a negative error code on failure + */ +int ceph_fstat(struct ceph_mount_info *cmount, int fd, struct stat *stbuf) + LIBCEPHFS_DEPRECATED; + +/** + * Set a file's attributes. + * + * @param cmount the ceph mount handle to use for performing the setattr. + * @param relpath the path to the file/directory to set the attributes of. + * @param stx the statx struct that must include attribute values to set on the file. + * @param mask a mask of all the CEPH_SETATTR_* values that have been set in the statx struct. + * @param flags mask of AT_* flags (only AT_ATTR_NOFOLLOW is respected for now) + * @returns 0 on success or negative error code on failure. + */ +int ceph_setattrx(struct ceph_mount_info *cmount, const char *relpath, struct ceph_statx *stx, int mask, int flags); + +/** + * Set a file's attributes (extended version). + * + * @param cmount the ceph mount handle to use for performing the setattr. + * @param fd the fd of the open file/directory to set the attributes of. + * @param stx the statx struct that must include attribute values to set on the file. + * @param mask a mask of all the stat values that have been set on the stat struct. + * @returns 0 on success or negative error code on failure. + */ +int ceph_fsetattrx(struct ceph_mount_info *cmount, int fd, struct ceph_statx *stx, int mask); + +/** + * Change the mode bits (permissions) of a file/directory. + * + * @param cmount the ceph mount handle to use for performing the chmod. + * @param path the path to the file/directory to change the mode bits on. + * @param mode the new permissions to set. + * @returns 0 on success or a negative error code on failure. + */ +int ceph_chmod(struct ceph_mount_info *cmount, const char *path, mode_t mode); + +/** + * Change the mode bits (permissions) of a file/directory. If the path is a + * symbolic link, it's not de-referenced. + * + * @param cmount the ceph mount handle to use for performing the chmod. + * @param path the path of file/directory to change the mode bits on. + * @param mode the new permissions to set. + * @returns 0 on success or a negative error code on failure. + */ +int ceph_lchmod(struct ceph_mount_info *cmount, const char *path, mode_t mode); + +/** + * Change the mode bits (permissions) of an open file. + * + * @param cmount the ceph mount handle to use for performing the chmod. + * @param fd the open file descriptor to change the mode bits on. + * @param mode the new permissions to set. + * @returns 0 on success or a negative error code on failure. + */ +int ceph_fchmod(struct ceph_mount_info *cmount, int fd, mode_t mode); + +/** + * Change the mode bits (permissions) of a file relative to a file descriptor. + * + * @param cmount the ceph mount handle to use for performing the chown. + * @param dirfd open file descriptor (or CEPHFS_AT_FDCWD) + * @param relpath the relpath of the file/directory to change the ownership of. + * @param mode the new permissions to set. + * @param flags bitfield that can be used to set AT_* modifier flags (AT_SYMLINK_NOFOLLOW) + * @returns 0 on success or negative error code on failure. + */ +int ceph_chmodat(struct ceph_mount_info *cmount, int dirfd, const char *relpath, + mode_t mode, int flags); + +/** + * Change the ownership of a file/directory. + * + * @param cmount the ceph mount handle to use for performing the chown. + * @param path the path of the file/directory to change the ownership of. + * @param uid the user id to set on the file/directory. + * @param gid the group id to set on the file/directory. + * @returns 0 on success or negative error code on failure. + */ +int ceph_chown(struct ceph_mount_info *cmount, const char *path, int uid, int gid); + +/** + * Change the ownership of a file from an open file descriptor. + * + * @param cmount the ceph mount handle to use for performing the chown. + * @param fd the fd of the open file/directory to change the ownership of. + * @param uid the user id to set on the file/directory. + * @param gid the group id to set on the file/directory. + * @returns 0 on success or negative error code on failure. + */ +int ceph_fchown(struct ceph_mount_info *cmount, int fd, int uid, int gid); + +/** + * Change the ownership of a file/directory, don't follow symlinks. + * + * @param cmount the ceph mount handle to use for performing the chown. + * @param path the path of the file/directory to change the ownership of. + * @param uid the user id to set on the file/directory. + * @param gid the group id to set on the file/directory. + * @returns 0 on success or negative error code on failure. + */ +int ceph_lchown(struct ceph_mount_info *cmount, const char *path, int uid, int gid); + +/** + * Change the ownership of a file/directory releative to a file descriptor. + * + * @param cmount the ceph mount handle to use for performing the chown. + * @param dirfd open file descriptor (or CEPHFS_AT_FDCWD) + * @param relpath the relpath of the file/directory to change the ownership of. + * @param uid the user id to set on the file/directory. + * @param gid the group id to set on the file/directory. + * @param flags bitfield that can be used to set AT_* modifier flags (AT_SYMLINK_NOFOLLOW) + * @returns 0 on success or negative error code on failure. + */ +int ceph_chownat(struct ceph_mount_info *cmount, int dirfd, const char *relpath, + uid_t uid, gid_t gid, int flags); + +/** + * Change file/directory last access and modification times. + * + * @param cmount the ceph mount handle to use for performing the utime. + * @param path the path to the file/directory to set the time values of. + * @param buf holding the access and modification times to set on the file. + * @returns 0 on success or negative error code on failure. + */ +int ceph_utime(struct ceph_mount_info *cmount, const char *path, struct utimbuf *buf); + +/** + * Change file/directory last access and modification times. + * + * @param cmount the ceph mount handle to use for performing the utime. + * @param fd the fd of the open file/directory to set the time values of. + * @param buf holding the access and modification times to set on the file. + * @returns 0 on success or negative error code on failure. + */ +int ceph_futime(struct ceph_mount_info *cmount, int fd, struct utimbuf *buf); + +/** + * Change file/directory last access and modification times. + * + * @param cmount the ceph mount handle to use for performing the utime. + * @param path the path to the file/directory to set the time values of. + * @param times holding the access and modification times to set on the file. + * @returns 0 on success or negative error code on failure. + */ +int ceph_utimes(struct ceph_mount_info *cmount, const char *path, struct timeval times[2]); + +/** + * Change file/directory last access and modification times, don't follow symlinks. + * + * @param cmount the ceph mount handle to use for performing the utime. + * @param path the path to the file/directory to set the time values of. + * @param times holding the access and modification times to set on the file. + * @returns 0 on success or negative error code on failure. + */ +int ceph_lutimes(struct ceph_mount_info *cmount, const char *path, struct timeval times[2]); + +/** + * Change file/directory last access and modification times. + * + * @param cmount the ceph mount handle to use for performing the utime. + * @param fd the fd of the open file/directory to set the time values of. + * @param times holding the access and modification times to set on the file. + * @returns 0 on success or negative error code on failure. + */ +int ceph_futimes(struct ceph_mount_info *cmount, int fd, struct timeval times[2]); + +/** + * Change file/directory last access and modification times. + * + * @param cmount the ceph mount handle to use for performing the utime. + * @param fd the fd of the open file/directory to set the time values of. + * @param times holding the access and modification times to set on the file. + * @returns 0 on success or negative error code on failure. + */ +int ceph_futimens(struct ceph_mount_info *cmount, int fd, struct timespec times[2]); + +/** + * Change file/directory last access and modification times relative + * to a file descriptor. + * + * @param cmount the ceph mount handle to use for performing the utime. + * @param dirfd open file descriptor (or CEPHFS_AT_FDCWD) + * @param relpath the relpath of the file/directory to change the ownership of. + * @param dirfd the fd of the open file/directory to set the time values of. + * @param times holding the access and modification times to set on the file. + * @param flags bitfield that can be used to set AT_* modifier flags (AT_SYMLINK_NOFOLLOW) + * @returns 0 on success or negative error code on failure. + */ +int ceph_utimensat(struct ceph_mount_info *cmount, int dirfd, const char *relpath, + struct timespec times[2], int flags); + +/** + * Apply or remove an advisory lock. + * + * @param cmount the ceph mount handle to use for performing the lock. + * @param fd the open file descriptor to change advisory lock. + * @param operation the advisory lock operation to be performed on the file + * descriptor among LOCK_SH (shared lock), LOCK_EX (exclusive lock), + * or LOCK_UN (remove lock). The LOCK_NB value can be ORed to perform a + * non-blocking operation. + * @param owner the user-supplied owner identifier (an arbitrary integer) + * @returns 0 on success or negative error code on failure. + */ +int ceph_flock(struct ceph_mount_info *cmount, int fd, int operation, + uint64_t owner); + +/** + * Truncate the file to the given size. If this operation causes the + * file to expand, the empty bytes will be filled in with zeros. + * + * @param cmount the ceph mount handle to use for performing the truncate. + * @param path the path to the file to truncate. + * @param size the new size of the file. + * @returns 0 on success or a negative error code on failure. + */ +int ceph_truncate(struct ceph_mount_info *cmount, const char *path, int64_t size); + +/** + * Make a block or character special file. + * + * @param cmount the ceph mount handle to use for performing the mknod. + * @param path the path to the special file. + * @param mode the permissions to use and the type of special file. The type can be + * one of S_IFREG, S_IFCHR, S_IFBLK, S_IFIFO. + * @param rdev If the file type is S_IFCHR or S_IFBLK then this parameter specifies the + * major and minor numbers of the newly created device special file. Otherwise, + * it is ignored. + * @returns 0 on success or negative error code on failure. + */ +int ceph_mknod(struct ceph_mount_info *cmount, const char *path, mode_t mode, dev_t rdev); +/** + * Create and/or open a file. + * + * @param cmount the ceph mount handle to use for performing the open. + * @param path the path of the file to open. If the flags parameter includes O_CREAT, + * the file will first be created before opening. + * @param flags a set of option masks that control how the file is created/opened. + * @param mode the permissions to place on the file if the file does not exist and O_CREAT + * is specified in the flags. + * @returns a non-negative file descriptor number on success or a negative error code on failure. + */ +int ceph_open(struct ceph_mount_info *cmount, const char *path, int flags, mode_t mode); + +/** + * Create and/or open a file relative to a directory + * + * @param cmount the ceph mount handle to use for performing the open. + * @param dirfd open file descriptor (or CEPHFS_AT_FDCWD) + * @param relpath the path of the file to open. If the flags parameter includes O_CREAT, + * the file will first be created before opening. + * @param flags a set of option masks that control how the file is created/opened. + * @param mode the permissions to place on the file if the file does not exist and O_CREAT + * is specified in the flags. + * @returns a non-negative file descriptor number on success or a negative error code on failure. + */ +int ceph_openat(struct ceph_mount_info *cmount, int dirfd, const char *relpath, int flags, mode_t mode); + +/** + * Create and/or open a file with a specific file layout. + * + * @param cmount the ceph mount handle to use for performing the open. + * @param path the path of the file to open. If the flags parameter includes O_CREAT, + * the file will first be created before opening. + * @param flags a set of option masks that control how the file is created/opened. + * @param mode the permissions to place on the file if the file does not exist and O_CREAT + * is specified in the flags. + * @param stripe_unit the stripe unit size (option, 0 for default) + * @param stripe_count the stripe count (optional, 0 for default) + * @param object_size the object size (optional, 0 for default) + * @param data_pool name of target data pool name (optional, NULL or empty string for default) + * @returns a non-negative file descriptor number on success or a negative error code on failure. + */ +int ceph_open_layout(struct ceph_mount_info *cmount, const char *path, int flags, + mode_t mode, int stripe_unit, int stripe_count, int object_size, + const char *data_pool); + +/** + * Close the open file. + * + * @param cmount the ceph mount handle to use for performing the close. + * @param fd the file descriptor referring to the open file. + * @returns 0 on success or a negative error code on failure. + */ +int ceph_close(struct ceph_mount_info *cmount, int fd); + +/** + * Reposition the open file stream based on the given offset. + * + * @param cmount the ceph mount handle to use for performing the lseek. + * @param fd the open file descriptor referring to the open file and holding the + * current position of the stream. + * @param offset the offset to set the stream to + * @param whence the flag to indicate what type of seeking to perform: + * SEEK_SET: the offset is set to the given offset in the file. + * SEEK_CUR: the offset is set to the current location plus @e offset bytes. + * SEEK_END: the offset is set to the end of the file plus @e offset bytes. + * @returns 0 on success or a negative error code on failure. + */ +int64_t ceph_lseek(struct ceph_mount_info *cmount, int fd, int64_t offset, int whence); +/** + * Read data from the file. + * + * @param cmount the ceph mount handle to use for performing the read. + * @param fd the file descriptor of the open file to read from. + * @param buf the buffer to read data into + * @param size the initial size of the buffer + * @param offset the offset in the file to read from. If this value is negative, the + * function reads from the current offset of the file descriptor. + * @returns the number of bytes read into buf, or a negative error code on failure. + */ +int ceph_read(struct ceph_mount_info *cmount, int fd, char *buf, int64_t size, int64_t offset); + +/** + * Read data from the file. + * @param cmount the ceph mount handle to use for performing the read. + * @param fd the file descriptor of the open file to read from. + * @param iov the iov structure to read data into + * @param iovcnt the number of items that iov includes + * @param offset the offset in the file to read from. If this value is negative, the + * function reads from the current offset of the file descriptor. + * @returns the number of bytes read into buf, or a negative error code on failure. + */ +int ceph_preadv(struct ceph_mount_info *cmount, int fd, const struct iovec *iov, int iovcnt, + int64_t offset); + +/** + * Write data to a file. + * + * @param cmount the ceph mount handle to use for performing the write. + * @param fd the file descriptor of the open file to write to + * @param buf the bytes to write to the file + * @param size the size of the buf array + * @param offset the offset of the file write into. If this value is negative, the + * function writes to the current offset of the file descriptor. + * @returns the number of bytes written, or a negative error code + */ +int ceph_write(struct ceph_mount_info *cmount, int fd, const char *buf, int64_t size, + int64_t offset); + +/** + * Write data to a file. + * + * @param cmount the ceph mount handle to use for performing the write. + * @param fd the file descriptor of the open file to write to + * @param iov the iov structure to read data into + * @param iovcnt the number of items that iov includes + * @param offset the offset of the file write into. If this value is negative, the + * function writes to the current offset of the file descriptor. + * @returns the number of bytes written, or a negative error code + */ +int ceph_pwritev(struct ceph_mount_info *cmount, int fd, const struct iovec *iov, int iovcnt, + int64_t offset); + +/** + * Truncate a file to the given size. + * + * @param cmount the ceph mount handle to use for performing the ftruncate. + * @param fd the file descriptor of the file to truncate + * @param size the new size of the file + * @returns 0 on success or a negative error code on failure. + */ +int ceph_ftruncate(struct ceph_mount_info *cmount, int fd, int64_t size); + +/** + * Synchronize an open file to persistent media. + * + * @param cmount the ceph mount handle to use for performing the fsync. + * @param fd the file descriptor of the file to sync. + * @param syncdataonly a boolean whether to synchronize metadata and data (0) + * or just data (1). + * @return 0 on success or a negative error code on failure. + */ +int ceph_fsync(struct ceph_mount_info *cmount, int fd, int syncdataonly); + +/** + * Preallocate or release disk space for the file for the byte range. + * + * @param cmount the ceph mount handle to use for performing the fallocate. + * @param fd the file descriptor of the file to fallocate. + * @param mode the flags determines the operation to be performed on the given range. + * default operation (0) allocate and initialize to zero the file in the byte range, + * and the file size will be changed if offset + length is greater than + * the file size. if the FALLOC_FL_KEEP_SIZE flag is specified in the mode, + * the file size will not be changed. if the FALLOC_FL_PUNCH_HOLE flag is + * specified in the mode, the operation is deallocate space and zero the byte range. + * @param offset the byte range starting. + * @param length the length of the range. + * @return 0 on success or a negative error code on failure. + */ +int ceph_fallocate(struct ceph_mount_info *cmount, int fd, int mode, + int64_t offset, int64_t length); + +/** + * Enable/disable lazyio for the file. + * + * @param cmount the ceph mount handle to use for performing the fsync. + * @param fd the file descriptor of the file to sync. + * @param enable a boolean to enable lazyio or disable lazyio. + * @returns 0 on success or a negative error code on failure. + */ +int ceph_lazyio(struct ceph_mount_info *cmount, int fd, int enable); + + +/** + * Flushes the write buffer for the file thereby propogating the buffered write to the file. + * + * @param cmount the ceph mount handle to use for performing the fsync. + * @param fd the file descriptor of the file to sync. + * @param offset a boolean to enable lazyio or disable lazyio. + * @returns 0 on success or a negative error code on failure. + */ +int ceph_lazyio_propagate(struct ceph_mount_info *cmount, int fd, int64_t offset, size_t count); + + +/** + * Flushes the write buffer for the file and invalidate the read cache. This allows a subsequent read operation to read and cache data directly from the file and hence everyone's propagated writes would be visible. + * + * @param cmount the ceph mount handle to use for performing the fsync. + * @param fd the file descriptor of the file to sync. + * @param offset a boolean to enable lazyio or disable lazyio. + * @returns 0 on success or a negative error code on failure. + */ +int ceph_lazyio_synchronize(struct ceph_mount_info *cmount, int fd, int64_t offset, size_t count); + +/** @} file */ + +/** + * @defgroup libcephfs_h_xattr Extended Attribute manipulation and handling. + * Functions for creating and manipulating extended attributes on files. + * + * @{ + */ + +/** + * Get an extended attribute. + * + * @param cmount the ceph mount handle to use for performing the getxattr. + * @param path the path to the file + * @param name the name of the extended attribute to get + * @param value a pre-allocated buffer to hold the xattr's value + * @param size the size of the pre-allocated buffer + * @returns the size of the value or a negative error code on failure. + */ +int ceph_getxattr(struct ceph_mount_info *cmount, const char *path, const char *name, + void *value, size_t size); + +/** + * Get an extended attribute. + * + * @param cmount the ceph mount handle to use for performing the getxattr. + * @param fd the open file descriptor referring to the file to get extended attribute from. + * @param name the name of the extended attribute to get + * @param value a pre-allocated buffer to hold the xattr's value + * @param size the size of the pre-allocated buffer + * @returns the size of the value or a negative error code on failure. + */ +int ceph_fgetxattr(struct ceph_mount_info *cmount, int fd, const char *name, + void *value, size_t size); + +/** + * Get an extended attribute without following symbolic links. This function is + * identical to ceph_getxattr, but if the path refers to a symbolic link, + * we get the extended attributes of the symlink rather than the attributes + * of the link itself. + * + * @param cmount the ceph mount handle to use for performing the lgetxattr. + * @param path the path to the file + * @param name the name of the extended attribute to get + * @param value a pre-allocated buffer to hold the xattr's value + * @param size the size of the pre-allocated buffer + * @returns the size of the value or a negative error code on failure. + */ +int ceph_lgetxattr(struct ceph_mount_info *cmount, const char *path, const char *name, + void *value, size_t size); + +/** + * List the extended attribute keys on a file. + * + * @param cmount the ceph mount handle to use for performing the listxattr. + * @param path the path to the file. + * @param list a buffer to be filled in with the list of extended attributes keys. + * @param size the size of the list buffer. + * @returns the size of the resulting list filled in. + */ +int ceph_listxattr(struct ceph_mount_info *cmount, const char *path, char *list, size_t size); + +/** + * List the extended attribute keys on a file. + * + * @param cmount the ceph mount handle to use for performing the listxattr. + * @param fd the open file descriptor referring to the file to list extended attributes on. + * @param list a buffer to be filled in with the list of extended attributes keys. + * @param size the size of the list buffer. + * @returns the size of the resulting list filled in. + */ +int ceph_flistxattr(struct ceph_mount_info *cmount, int fd, char *list, size_t size); + +/** + * Get the list of extended attribute keys on a file, but do not follow symbolic links. + * + * @param cmount the ceph mount handle to use for performing the llistxattr. + * @param path the path to the file. + * @param list a buffer to be filled in with the list of extended attributes keys. + * @param size the size of the list buffer. + * @returns the size of the resulting list filled in. + */ +int ceph_llistxattr(struct ceph_mount_info *cmount, const char *path, char *list, size_t size); + +/** + * Remove an extended attribute from a file. + * + * @param cmount the ceph mount handle to use for performing the removexattr. + * @param path the path to the file. + * @param name the name of the extended attribute to remove. + * @returns 0 on success or a negative error code on failure. + */ +int ceph_removexattr(struct ceph_mount_info *cmount, const char *path, const char *name); + +/** + * Remove an extended attribute from a file. + * + * @param cmount the ceph mount handle to use for performing the removexattr. + * @param fd the open file descriptor referring to the file to remove extended attribute from. + * @param name the name of the extended attribute to remove. + * @returns 0 on success or a negative error code on failure. + */ +int ceph_fremovexattr(struct ceph_mount_info *cmount, int fd, const char *name); + +/** + * Remove the extended attribute from a file, do not follow symbolic links. + * + * @param cmount the ceph mount handle to use for performing the lremovexattr. + * @param path the path to the file. + * @param name the name of the extended attribute to remove. + * @returns 0 on success or a negative error code on failure. + */ +int ceph_lremovexattr(struct ceph_mount_info *cmount, const char *path, const char *name); + +/** + * Set an extended attribute on a file. + * + * @param cmount the ceph mount handle to use for performing the setxattr. + * @param path the path to the file. + * @param name the name of the extended attribute to set. + * @param value the bytes of the extended attribute value + * @param size the size of the extended attribute value + * @param flags the flags can be: + * CEPH_XATTR_CREATE: create the extended attribute. Must not exist. + * CEPH_XATTR_REPLACE: replace the extended attribute, Must already exist. + * @returns 0 on success or a negative error code on failure. + */ +int ceph_setxattr(struct ceph_mount_info *cmount, const char *path, const char *name, + const void *value, size_t size, int flags); + +/** + * Set an extended attribute on a file. + * + * @param cmount the ceph mount handle to use for performing the setxattr. + * @param fd the open file descriptor referring to the file to set extended attribute on. + * @param name the name of the extended attribute to set. + * @param value the bytes of the extended attribute value + * @param size the size of the extended attribute value + * @param flags the flags can be: + * CEPH_XATTR_CREATE: create the extended attribute. Must not exist. + * CEPH_XATTR_REPLACE: replace the extended attribute, Must already exist. + * @returns 0 on success or a negative error code on failure. + */ +int ceph_fsetxattr(struct ceph_mount_info *cmount, int fd, const char *name, + const void *value, size_t size, int flags); + +/** + * Set an extended attribute on a file, do not follow symbolic links. + * + * @param cmount the ceph mount handle to use for performing the lsetxattr. + * @param path the path to the file. + * @param name the name of the extended attribute to set. + * @param value the bytes of the extended attribute value + * @param size the size of the extended attribute value + * @param flags the flags can be: + * CEPH_XATTR_CREATE: create the extended attribute. Must not exist. + * CEPH_XATTR_REPLACE: replace the extended attribute, Must already exist. + * @returns 0 on success or a negative error code on failure. + */ +int ceph_lsetxattr(struct ceph_mount_info *cmount, const char *path, const char *name, + const void *value, size_t size, int flags); + +/** @} xattr */ + +/** + * @defgroup libcephfs_h_filelayout Control File Layout. + * Functions for setting and getting the file layout of existing files. + * + * @{ + */ + +/** + * Get the file striping unit from an open file descriptor. + * + * @param cmount the ceph mount handle to use. + * @param fh the open file descriptor referring to the file to get the striping unit of. + * @returns the striping unit of the file or a negative error code on failure. + */ +int ceph_get_file_stripe_unit(struct ceph_mount_info *cmount, int fh); + +/** + * Get the file striping unit. + * + * @param cmount the ceph mount handle to use. + * @param path the path of the file/directory get the striping unit of. + * @returns the striping unit of the file or a negative error code on failure. + */ +int ceph_get_path_stripe_unit(struct ceph_mount_info *cmount, const char *path); + +/** + * Get the file striping count from an open file descriptor. + * + * @param cmount the ceph mount handle to use. + * @param fh the open file descriptor referring to the file to get the striping count of. + * @returns the striping count of the file or a negative error code on failure. + */ +int ceph_get_file_stripe_count(struct ceph_mount_info *cmount, int fh); + +/** + * Get the file striping count. + * + * @param cmount the ceph mount handle to use. + * @param path the path of the file/directory get the striping count of. + * @returns the striping count of the file or a negative error code on failure. + */ +int ceph_get_path_stripe_count(struct ceph_mount_info *cmount, const char *path); + +/** + * Get the file object size from an open file descriptor. + * + * @param cmount the ceph mount handle to use. + * @param fh the open file descriptor referring to the file to get the object size of. + * @returns the object size of the file or a negative error code on failure. + */ +int ceph_get_file_object_size(struct ceph_mount_info *cmount, int fh); + +/** + * Get the file object size. + * + * @param cmount the ceph mount handle to use. + * @param path the path of the file/directory get the object size of. + * @returns the object size of the file or a negative error code on failure. + */ +int ceph_get_path_object_size(struct ceph_mount_info *cmount, const char *path); + +/** + * Get the file pool information from an open file descriptor. + * + * @param cmount the ceph mount handle to use. + * @param fh the open file descriptor referring to the file to get the pool information of. + * @returns the ceph pool id that the file is in + */ +int ceph_get_file_pool(struct ceph_mount_info *cmount, int fh); + +/** + * Get the file pool information. + * + * @param cmount the ceph mount handle to use. + * @param path the path of the file/directory get the pool information of. + * @returns the ceph pool id that the file is in + */ +int ceph_get_path_pool(struct ceph_mount_info *cmount, const char *path); + +/** + * Get the name of the pool a opened file is stored in, + * + * Write the name of the file's pool to the buffer. If buflen is 0, return + * a suggested length for the buffer. + * + * @param cmount the ceph mount handle to use. + * @param fh the open file descriptor referring to the file + * @param buf buffer to store the name in + * @param buflen size of the buffer + * @returns length in bytes of the pool name, or -ERANGE if the buffer is not large enough. + */ +int ceph_get_file_pool_name(struct ceph_mount_info *cmount, int fh, char *buf, size_t buflen); + +/** + * get the name of a pool by id + * + * Given a pool's numeric identifier, get the pool's alphanumeric name. + * + * @param cmount the ceph mount handle to use + * @param pool the numeric pool id + * @param buf buffer to sore the name in + * @param buflen size of the buffer + * @returns length in bytes of the pool name, or -ERANGE if the buffer is not large enough + */ +int ceph_get_pool_name(struct ceph_mount_info *cmount, int pool, char *buf, size_t buflen); + +/** + * Get the name of the pool a file is stored in + * + * Write the name of the file's pool to the buffer. If buflen is 0, return + * a suggested length for the buffer. + * + * @param cmount the ceph mount handle to use. + * @param path the path of the file/directory + * @param buf buffer to store the name in + * @param buflen size of the buffer + * @returns length in bytes of the pool name, or -ERANGE if the buffer is not large enough. + */ +int ceph_get_path_pool_name(struct ceph_mount_info *cmount, const char *path, char *buf, size_t buflen); + +/** + * Get the default pool name of cephfs + * Write the name of the default pool to the buffer. If buflen is 0, return + * a suggested length for the buffer. + * @param cmount the ceph mount handle to use. + * @param buf buffer to store the name in + * @param buflen size of the buffer + * @returns length in bytes of the pool name, or -ERANGE if the buffer is not large enough. + */ +int ceph_get_default_data_pool_name(struct ceph_mount_info *cmount, char *buf, size_t buflen); + +/** + * Get the file layout from an open file descriptor. + * + * @param cmount the ceph mount handle to use. + * @param fh the open file descriptor referring to the file to get the layout of. + * @param stripe_unit where to store the striping unit of the file + * @param stripe_count where to store the striping count of the file + * @param object_size where to store the object size of the file + * @param pg_pool where to store the ceph pool id that the file is in + * @returns 0 on success or a negative error code on failure. + */ +int ceph_get_file_layout(struct ceph_mount_info *cmount, int fh, int *stripe_unit, int *stripe_count, int *object_size, int *pg_pool); + +/** + * Get the file layout. + * + * @param cmount the ceph mount handle to use. + * @param path the path of the file/directory get the layout of. + * @param stripe_unit where to store the striping unit of the file + * @param stripe_count where to store the striping count of the file + * @param object_size where to store the object size of the file + * @param pg_pool where to store the ceph pool id that the file is in + * @returns 0 on success or a negative error code on failure. + */ +int ceph_get_path_layout(struct ceph_mount_info *cmount, const char *path, int *stripe_unit, int *stripe_count, int *object_size, int *pg_pool); + +/** + * Get the file replication information from an open file descriptor. + * + * @param cmount the ceph mount handle to use. + * @param fh the open file descriptor referring to the file to get the replication information of. + * @returns the replication factor of the file. + */ +int ceph_get_file_replication(struct ceph_mount_info *cmount, int fh); + +/** + * Get the file replication information. + * + * @param cmount the ceph mount handle to use. + * @param path the path of the file/directory get the replication information of. + * @returns the replication factor of the file. + */ +int ceph_get_path_replication(struct ceph_mount_info *cmount, const char *path); + +/** + * Get the id of the named pool. + * + * @param cmount the ceph mount handle to use. + * @param pool_name the name of the pool. + * @returns the pool id, or a negative error code on failure. + */ +int ceph_get_pool_id(struct ceph_mount_info *cmount, const char *pool_name); + +/** + * Get the pool replication factor. + * + * @param cmount the ceph mount handle to use. + * @param pool_id the pool id to look up + * @returns the replication factor, or a negative error code on failure. + */ +int ceph_get_pool_replication(struct ceph_mount_info *cmount, int pool_id); + +/** + * Get the OSD address where the primary copy of a file stripe is located. + * + * @param cmount the ceph mount handle to use. + * @param fd the open file descriptor referring to the file to get the striping unit of. + * @param offset the offset into the file to specify the stripe. The offset can be + * anywhere within the stripe unit. + * @param addr the address of the OSD holding that stripe + * @param naddr the capacity of the address passed in. + * @returns the size of the addressed filled into the @e addr parameter, or a negative + * error code on failure. + */ +int ceph_get_file_stripe_address(struct ceph_mount_info *cmount, int fd, int64_t offset, + struct sockaddr_storage *addr, int naddr); + +/** + * Get the list of OSDs where the objects containing a file offset are located. + * + * @param cmount the ceph mount handle to use. + * @param fd the open file descriptor referring to the file. + * @param offset the offset within the file. + * @param length return the number of bytes between the offset and the end of + * the stripe unit (optional). + * @param osds an integer array to hold the OSD ids. + * @param nosds the size of the integer array. + * @returns the number of items stored in the output array, or -ERANGE if the + * array is not large enough. + */ +int ceph_get_file_extent_osds(struct ceph_mount_info *cmount, int fd, + int64_t offset, int64_t *length, int *osds, int nosds); + +/** + * Get the fully qualified CRUSH location of an OSD. + * + * Returns (type, name) string pairs for each device in the CRUSH bucket + * hierarchy starting from the given osd to the root. Each pair element is + * separated by a NULL character. + * + * @param cmount the ceph mount handle to use. + * @param osd the OSD id. + * @param path buffer to store location. + * @param len size of buffer. + * @returns the amount of bytes written into the buffer, or -ERANGE if the + * array is not large enough. + */ +int ceph_get_osd_crush_location(struct ceph_mount_info *cmount, + int osd, char *path, size_t len); + +/** + * Get the network address of an OSD. + * + * @param cmount the ceph mount handle. + * @param osd the OSD id. + * @param addr the OSD network address. + * @returns zero on success, other returns a negative error code. + */ +int ceph_get_osd_addr(struct ceph_mount_info *cmount, int osd, + struct sockaddr_storage *addr); + +/** + * Get the file layout stripe unit granularity. + * @param cmount the ceph mount handle. + * @returns the stripe unit granularity or a negative error code on failure. + */ +int ceph_get_stripe_unit_granularity(struct ceph_mount_info *cmount); + +/** @} filelayout */ + +/** + * No longer available. Do not use. + * These functions will return -EOPNOTSUPP. + */ +int ceph_set_default_file_stripe_unit(struct ceph_mount_info *cmount, int stripe); +int ceph_set_default_file_stripe_count(struct ceph_mount_info *cmount, int count); +int ceph_set_default_object_size(struct ceph_mount_info *cmount, int size); +int ceph_set_default_preferred_pg(struct ceph_mount_info *cmount, int osd); +int ceph_set_default_file_replication(struct ceph_mount_info *cmount, int replication); + +/** + * Read from local replicas when possible. + * + * @param cmount the ceph mount handle to use. + * @param val a boolean to set (1) or clear (0) the option to favor local objects + * for reads. + * @returns 0 + */ +int ceph_localize_reads(struct ceph_mount_info *cmount, int val); + +/** + * Get the osd id of the local osd (if any) + * + * @param cmount the ceph mount handle to use. + * @returns the osd (if any) local to the node where this call is made, otherwise + * -1 is returned. + */ +int ceph_get_local_osd(struct ceph_mount_info *cmount); + +/** @} default_filelayout */ + +/** + * Get the capabilities currently issued to the client. + * + * @param cmount the ceph mount handle to use. + * @param fd the file descriptor to get issued + * @returns the current capabilities issued to this client + * for the open file + */ +int ceph_debug_get_fd_caps(struct ceph_mount_info *cmount, int fd); + +/** + * Get the capabilities currently issued to the client. + * + * @param cmount the ceph mount handle to use. + * @param path the path to the file + * @returns the current capabilities issued to this client + * for the file + */ +int ceph_debug_get_file_caps(struct ceph_mount_info *cmount, const char *path); + +/* Low Level */ +struct Inode *ceph_ll_get_inode(struct ceph_mount_info *cmount, + vinodeno_t vino); + +int ceph_ll_lookup_vino(struct ceph_mount_info *cmount, vinodeno_t vino, + Inode **inode); + +int ceph_ll_lookup_inode( + struct ceph_mount_info *cmount, + struct inodeno_t ino, + Inode **inode); + +/** + * Get the root inode of FS. Increase counter of references for root Inode. You must call ceph_ll_forget for it! + * + * @param cmount the ceph mount handle to use. + * @param parent pointer to pointer to Inode struct. Pointer to root inode will be returned + * @returns 0 if all good + */ +int ceph_ll_lookup_root(struct ceph_mount_info *cmount, + Inode **parent); +int ceph_ll_lookup(struct ceph_mount_info *cmount, Inode *parent, + const char *name, Inode **out, struct ceph_statx *stx, + unsigned want, unsigned flags, const UserPerm *perms); +int ceph_ll_put(struct ceph_mount_info *cmount, struct Inode *in); +int ceph_ll_forget(struct ceph_mount_info *cmount, struct Inode *in, + int count); +int ceph_ll_walk(struct ceph_mount_info *cmount, const char* name, Inode **i, + struct ceph_statx *stx, unsigned int want, unsigned int flags, + const UserPerm *perms); +int ceph_ll_getattr(struct ceph_mount_info *cmount, struct Inode *in, + struct ceph_statx *stx, unsigned int want, unsigned int flags, + const UserPerm *perms); +int ceph_ll_setattr(struct ceph_mount_info *cmount, struct Inode *in, + struct ceph_statx *stx, int mask, const UserPerm *perms); +int ceph_ll_open(struct ceph_mount_info *cmount, struct Inode *in, int flags, + struct Fh **fh, const UserPerm *perms); +off_t ceph_ll_lseek(struct ceph_mount_info *cmount, struct Fh* filehandle, + off_t offset, int whence); +int ceph_ll_read(struct ceph_mount_info *cmount, struct Fh* filehandle, + int64_t off, uint64_t len, char* buf); +int ceph_ll_fsync(struct ceph_mount_info *cmount, struct Fh *fh, + int syncdataonly); +int ceph_ll_sync_inode(struct ceph_mount_info *cmount, struct Inode *in, + int syncdataonly); +int ceph_ll_fallocate(struct ceph_mount_info *cmount, struct Fh *fh, + int mode, int64_t offset, int64_t length); +int ceph_ll_write(struct ceph_mount_info *cmount, struct Fh* filehandle, + int64_t off, uint64_t len, const char *data); +int64_t ceph_ll_readv(struct ceph_mount_info *cmount, struct Fh *fh, + const struct iovec *iov, int iovcnt, int64_t off); +int64_t ceph_ll_writev(struct ceph_mount_info *cmount, struct Fh *fh, + const struct iovec *iov, int iovcnt, int64_t off); +int ceph_ll_close(struct ceph_mount_info *cmount, struct Fh* filehandle); +int ceph_ll_iclose(struct ceph_mount_info *cmount, struct Inode *in, int mode); +/** + * Get xattr value by xattr name. + * + * @param cmount the ceph mount handle to use. + * @param in file handle + * @param name name of attribute + * @param value pointer to begin buffer + * @param size buffer size + * @param perms pointer to UserPerms object + * @returns size of returned buffer. Negative number in error case + */ +int ceph_ll_getxattr(struct ceph_mount_info *cmount, struct Inode *in, + const char *name, void *value, size_t size, + const UserPerm *perms); +int ceph_ll_setxattr(struct ceph_mount_info *cmount, struct Inode *in, + const char *name, const void *value, size_t size, + int flags, const UserPerm *perms); +int ceph_ll_listxattr(struct ceph_mount_info *cmount, struct Inode *in, + char *list, size_t buf_size, size_t *list_size, + const UserPerm *perms); +int ceph_ll_removexattr(struct ceph_mount_info *cmount, struct Inode *in, + const char *name, const UserPerm *perms); +int ceph_ll_create(struct ceph_mount_info *cmount, Inode *parent, + const char *name, mode_t mode, int oflags, Inode **outp, + Fh **fhp, struct ceph_statx *stx, unsigned want, + unsigned lflags, const UserPerm *perms); +int ceph_ll_mknod(struct ceph_mount_info *cmount, Inode *parent, + const char *name, mode_t mode, dev_t rdev, Inode **out, + struct ceph_statx *stx, unsigned want, unsigned flags, + const UserPerm *perms); +int ceph_ll_mkdir(struct ceph_mount_info *cmount, Inode *parent, + const char *name, mode_t mode, Inode **out, + struct ceph_statx *stx, unsigned want, + unsigned flags, const UserPerm *perms); +int ceph_ll_link(struct ceph_mount_info *cmount, struct Inode *in, + struct Inode *newparent, const char *name, + const UserPerm *perms); +int ceph_ll_opendir(struct ceph_mount_info *cmount, struct Inode *in, + struct ceph_dir_result **dirpp, const UserPerm *perms); +int ceph_ll_releasedir(struct ceph_mount_info *cmount, + struct ceph_dir_result* dir); +int ceph_ll_rename(struct ceph_mount_info *cmount, struct Inode *parent, + const char *name, struct Inode *newparent, + const char *newname, const UserPerm *perms); +int ceph_ll_unlink(struct ceph_mount_info *cmount, struct Inode *in, + const char *name, const UserPerm *perms); +int ceph_ll_statfs(struct ceph_mount_info *cmount, struct Inode *in, + struct statvfs *stbuf); +int ceph_ll_readlink(struct ceph_mount_info *cmount, struct Inode *in, + char *buf, size_t bufsize, const UserPerm *perms); +int ceph_ll_symlink(struct ceph_mount_info *cmount, + Inode *in, const char *name, const char *value, + Inode **out, struct ceph_statx *stx, + unsigned want, unsigned flags, + const UserPerm *perms); +int ceph_ll_rmdir(struct ceph_mount_info *cmount, struct Inode *in, + const char *name, const UserPerm *perms); +uint32_t ceph_ll_stripe_unit(struct ceph_mount_info *cmount, + struct Inode *in); +uint32_t ceph_ll_file_layout(struct ceph_mount_info *cmount, + struct Inode *in, + struct ceph_file_layout *layout); +uint64_t ceph_ll_snap_seq(struct ceph_mount_info *cmount, + struct Inode *in); +int ceph_ll_get_stripe_osd(struct ceph_mount_info *cmount, + struct Inode *in, + uint64_t blockno, + struct ceph_file_layout* layout); +int ceph_ll_num_osds(struct ceph_mount_info *cmount); +int ceph_ll_osdaddr(struct ceph_mount_info *cmount, + int osd, uint32_t *addr); +uint64_t ceph_ll_get_internal_offset(struct ceph_mount_info *cmount, + struct Inode *in, uint64_t blockno); +int ceph_ll_read_block(struct ceph_mount_info *cmount, + struct Inode *in, uint64_t blockid, + char* bl, uint64_t offset, uint64_t length, + struct ceph_file_layout* layout); +int ceph_ll_write_block(struct ceph_mount_info *cmount, + struct Inode *in, uint64_t blockid, + char* buf, uint64_t offset, + uint64_t length, struct ceph_file_layout* layout, + uint64_t snapseq, uint32_t sync); +int ceph_ll_commit_blocks(struct ceph_mount_info *cmount, + struct Inode *in, uint64_t offset, uint64_t range); + + +int ceph_ll_getlk(struct ceph_mount_info *cmount, + Fh *fh, struct flock *fl, uint64_t owner); +int ceph_ll_setlk(struct ceph_mount_info *cmount, + Fh *fh, struct flock *fl, uint64_t owner, int sleep); + +int ceph_ll_lazyio(struct ceph_mount_info *cmount, Fh *fh, int enable); + +/* + * Delegation support + * + * Delegations are way for an application to request exclusive or + * semi-exclusive access to an Inode. The client requests the delegation and + * if it's successful it can reliably cache file data and metadata until the + * delegation is recalled. + * + * Recalls are issued via a callback function, provided by the application. + * Callback functions should act something like signal handlers. You want to + * do as little as possible in the callback. Any major work should be deferred + * in some fashion as it's difficult to predict the context in which this + * function will be called. + * + * Once the delegation has been recalled, the application should return it as + * soon as possible. The application has client_deleg_timeout seconds to + * return it, after which the cmount structure is forcibly unmounted and + * further calls into it fail. + * + * The application can set the client_deleg_timeout config option to suit its + * needs, but it should take care to choose a value that allows it to avoid + * forcible eviction from the cluster in the event of an application bug. + */ + +/* Commands for manipulating delegation state */ +#ifndef CEPH_DELEGATION_NONE +# define CEPH_DELEGATION_NONE 0 +# define CEPH_DELEGATION_RD 1 +# define CEPH_DELEGATION_WR 2 +#endif + +/** + * Get the amount of time that the client has to return caps + * @param cmount the ceph mount handle to use. + * + * In the event that a client does not return its caps, the MDS may blocklist + * it after this timeout. Applications should check this value and ensure + * that they set the delegation timeout to a value lower than this. + * + * This call returns the cap return timeout (in seconds) for this cmount, or + * zero if it's not mounted. + */ +uint32_t ceph_get_cap_return_timeout(struct ceph_mount_info *cmount); + +/** + * Set the delegation timeout for the mount (thereby enabling delegations) + * @param cmount the ceph mount handle to use. + * @param timeout the delegation timeout (in seconds) + * + * Since the client could end up blocklisted if it doesn't return delegations + * in time, we mandate that any application wanting to use delegations + * explicitly set the timeout beforehand. Until this call is done on the + * mount, attempts to set a delegation will return -ETIME. + * + * Once a delegation is recalled, if it is not returned in this amount of + * time, the cmount will be forcibly unmounted and further access attempts + * will fail (usually with -ENOTCONN errors). + * + * This value is further vetted against the cap return timeout, and this call + * can fail with -EINVAL if the timeout value is too long. Delegations can be + * disabled again by setting the timeout to 0. + */ +int ceph_set_deleg_timeout(struct ceph_mount_info *cmount, uint32_t timeout); + +/** + * Request a delegation on an open Fh + * @param cmount the ceph mount handle to use. + * @param fh file handle + * @param cmd CEPH_DELEGATION_* command + * @param cb callback function for recalling delegation + * @param priv opaque token passed back during recalls + * + * Returns 0 if the delegation was granted, -EAGAIN if there was a conflict + * and other error codes if there is a fatal error of some sort (e.g. -ENOMEM, + * -ETIME) + */ +int ceph_ll_delegation(struct ceph_mount_info *cmount, Fh *fh, + unsigned int cmd, ceph_deleg_cb_t cb, void *priv); + +mode_t ceph_umask(struct ceph_mount_info *cmount, mode_t mode); + +/* state reclaim */ +#define CEPH_RECLAIM_RESET 1 + +/** + * Set ceph client uuid + * @param cmount the ceph mount handle to use. + * @param uuid the uuid to set + * + * Must be called before mount. + */ +void ceph_set_uuid(struct ceph_mount_info *cmount, const char *uuid); + +/** + * Set ceph client session timeout + * @param cmount the ceph mount handle to use. + * @param timeout the timeout to set + * + * Must be called before mount. + */ +void ceph_set_session_timeout(struct ceph_mount_info *cmount, unsigned timeout); + +/** + * Start to reclaim states of other client + * @param cmount the ceph mount handle to use. + * @param uuid uuid of client whose states need to be reclaimed + * @param flags flags that control how states get reclaimed + * + * Returns 0 success, -EOPNOTSUPP if mds does not support the operation, + * -ENOENT if CEPH_RECLAIM_RESET is specified and there is no client + * with the given uuid, -ENOTRECOVERABLE in all other error cases. + */ +int ceph_start_reclaim(struct ceph_mount_info *cmount, + const char *uuid, unsigned flags); + +/** + * finish reclaiming states of other client ( + * @param cmount the ceph mount handle to use. + */ +void ceph_finish_reclaim(struct ceph_mount_info *cmount); + +/** + * Register a set of callbacks to be used with this cmount + * @param cmount the ceph mount handle on which the cb's should be registerd + * @param args callback arguments to register with the cmount + * + * Any fields set to NULL will be ignored. There currently is no way to + * unregister these callbacks, so this is a one-way change. + */ +void ceph_ll_register_callbacks(struct ceph_mount_info *cmount, + struct ceph_client_callback_args *args); + +/** + * Get snapshot info + * + * @param cmount the ceph mount handle to use for making the directory. + * @param path the path of the snapshot. This must be either an + * absolute path or a relative path off of the current working directory. + * @returns 0 on success or a negative return code on error. + */ +int ceph_get_snap_info(struct ceph_mount_info *cmount, + const char *path, struct snap_info *snap_info); + +/** + * Free snapshot info buffers + * + * @param snap_info snapshot info struct (fetched via call to ceph_get_snap_info()). + */ +void ceph_free_snap_info_buffer(struct snap_info *snap_info); +#ifdef __cplusplus +} +#endif + +#endif |