diff options
Diffstat (limited to 'lib/libnandfs/nandfs.c')
| -rw-r--r-- | lib/libnandfs/nandfs.c | 247 |
1 files changed, 247 insertions, 0 deletions
diff --git a/lib/libnandfs/nandfs.c b/lib/libnandfs/nandfs.c new file mode 100644 index 0000000..fd59a92 --- /dev/null +++ b/lib/libnandfs/nandfs.c @@ -0,0 +1,247 @@ +/*- + * Copyright (c) 2010-2012 Semihalf. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <assert.h> +#include <stdarg.h> +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <string.h> +#include <fcntl.h> +#include <errno.h> +#include <sys/ioctl.h> +#include <sys/stat.h> +#include <sys/param.h> +#include <sys/stdint.h> +#include <sys/ucred.h> +#include <sys/disk.h> +#include <sys/mount.h> + +#include <fs/nandfs/nandfs_fs.h> +#include <libnandfs.h> + +#define NANDFS_IS_VALID 0x1 +#define NANDFS_IS_OPENED 0x2 +#define NANDFS_IS_OPENED_DEV 0x4 +#define NANDFS_IS_ERROR 0x8 + +#define DEBUG +#undef DEBUG +#ifdef DEBUG +#define NANDFS_DEBUG(fmt, args...) do { \ + printf("libnandfs:" fmt "\n", ##args); } while (0) +#else +#define NANDFS_DEBUG(fmt, args...) +#endif + +#define NANDFS_ASSERT_VALID(fs) assert((fs)->n_flags & NANDFS_IS_VALID) +#define NANDFS_ASSERT_VALID_DEV(fs) \ + assert(((fs)->n_flags & (NANDFS_IS_VALID | NANDFS_IS_OPENED_DEV)) == \ + (NANDFS_IS_VALID | NANDFS_IS_OPENED_DEV)) + +int +nandfs_iserror(struct nandfs *fs) +{ + + NANDFS_ASSERT_VALID(fs); + + return (fs->n_flags & NANDFS_IS_ERROR); +} + +const char * +nandfs_errmsg(struct nandfs *fs) +{ + + NANDFS_ASSERT_VALID(fs); + + assert(nandfs_iserror(fs)); + assert(fs->n_errmsg); + return (fs->n_errmsg); +} + +static void +nandfs_seterr(struct nandfs *fs, const char *fmt, ...) +{ + va_list ap; + + va_start(ap, fmt); + vsnprintf(fs->n_errmsg, sizeof(fs->n_errmsg), fmt, ap); + va_end(ap); + fs->n_flags |= NANDFS_IS_ERROR; +} + +const char * +nandfs_dev(struct nandfs *fs) +{ + + NANDFS_ASSERT_VALID(fs); + return (fs->n_dev); +} + +void +nandfs_init(struct nandfs *fs, const char *dir) +{ + + snprintf(fs->n_ioc, sizeof(fs->n_ioc), "%s/%s", dir, "."); + fs->n_iocfd = -1; + fs->n_flags = NANDFS_IS_VALID; +} + +void +nandfs_destroy(struct nandfs *fs) +{ + + assert(fs->n_iocfd == -1); + fs->n_flags &= + ~(NANDFS_IS_ERROR | NANDFS_IS_VALID); + assert(fs->n_flags == 0); +} + +int +nandfs_open(struct nandfs *fs) +{ + struct nandfs_fsinfo fsinfo; + + fs->n_flags |= NANDFS_IS_OPENED; + + fs->n_iocfd = open(fs->n_ioc, O_RDONLY, S_IRUSR | S_IWUSR | S_IRGRP | + S_IWGRP | S_IROTH | S_IWOTH); + if (fs->n_iocfd == -1) { + nandfs_seterr(fs, "couldn't open %s: %s", fs->n_ioc, + strerror(errno)); + return (-1); + } + + if (ioctl(fs->n_iocfd, NANDFS_IOCTL_GET_FSINFO, &fsinfo) == -1) { + nandfs_seterr(fs, "couldn't fetch fsinfo: %s", + strerror(errno)); + return (-1); + } + + memcpy(&fs->n_fsdata, &fsinfo.fs_fsdata, sizeof(fs->n_fsdata)); + memcpy(&fs->n_sb, &fsinfo.fs_super, sizeof(fs->n_sb)); + snprintf(fs->n_dev, sizeof(fs->n_dev), "%s", fsinfo.fs_dev); + + return (0); +} + +void +nandfs_close(struct nandfs *fs) +{ + + NANDFS_ASSERT_VALID(fs); + assert(fs->n_flags & NANDFS_IS_OPENED); + + close(fs->n_iocfd); + fs->n_iocfd = -1; + fs->n_flags &= ~NANDFS_IS_OPENED; +} + +int +nandfs_get_cpstat(struct nandfs *fs, struct nandfs_cpstat *cpstat) +{ + + NANDFS_ASSERT_VALID(fs); + + if (ioctl(fs->n_iocfd, NANDFS_IOCTL_GET_CPSTAT, cpstat) == -1) { + nandfs_seterr(fs, "ioctl NANDFS_IOCTL_GET_CPSTAT: %s", + strerror(errno)); + return (-1); + } + + return (0); +} + +static ssize_t +nandfs_get_cpinfo(struct nandfs *fs, uint64_t cno, int mode, + struct nandfs_cpinfo *cpinfo, size_t nci) +{ + struct nandfs_argv args; + + NANDFS_ASSERT_VALID(fs); + + args.nv_base = (u_long)cpinfo; + args.nv_nmembs = nci; + args.nv_index = cno; + args.nv_flags = mode; + + if (ioctl(fs->n_iocfd, NANDFS_IOCTL_GET_CPINFO, &args) == -1) { + nandfs_seterr(fs, "ioctl NANDFS_IOCTL_GET_CPINFO: %s", + strerror(errno)); + return (-1); + } + + return (args.nv_nmembs); +} + +ssize_t +nandfs_get_cp(struct nandfs *fs, uint64_t cno, struct nandfs_cpinfo *cpinfo, + size_t nci) +{ + + return (nandfs_get_cpinfo(fs, cno, NANDFS_CHECKPOINT, cpinfo, nci)); +} + +ssize_t +nandfs_get_snap(struct nandfs *fs, uint64_t cno, struct nandfs_cpinfo *cpinfo, + size_t nci) +{ + + return (nandfs_get_cpinfo(fs, cno, NANDFS_SNAPSHOT, cpinfo, nci)); +} + +int +nandfs_make_snap(struct nandfs *fs, uint64_t *cno) +{ + + NANDFS_ASSERT_VALID(fs); + + if (ioctl(fs->n_iocfd, NANDFS_IOCTL_MAKE_SNAP, cno) == -1) { + nandfs_seterr(fs, "ioctl NANDFS_IOCTL_MAKE_SNAP: %s", + strerror(errno)); + return (-1); + } + + return (0); +} + +int +nandfs_delete_snap(struct nandfs *fs, uint64_t cno) +{ + + NANDFS_ASSERT_VALID(fs); + + if (ioctl(fs->n_iocfd, NANDFS_IOCTL_DELETE_SNAP, &cno) == -1) { + nandfs_seterr(fs, "ioctl NANDFS_IOCTL_DELETE_SNAP: %s", + strerror(errno)); + return (-1); + } + + return (0); +} |
