introduce iatt.h for inode attributes (to replace 'struct stat')

Signed-off-by: Anand V. Avati <avati@blackhole.gluster.com>
Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

BUG: 361 (GlusterFS 3.0 should work on Mac OS/X)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=361

1 files changed, 307 insertions, 0 deletions

diff --git a/libglusterfs/src/iatt.h b/libglusterfs/src/iatt.h
new file mode 100644
index 000000000..e94aa05ba
--- /dev/null
+++ b/libglusterfs/src/iatt.h
@@ -0,0 +1,307 @@
+/*
+  Copyright (c) 2010 Gluster, Inc. <http://www.gluster.com>
+  This file is part of GlusterFS.
+
+  GlusterFS is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published
+  by the Free Software Foundation; either version 3 of the License,
+  or (at your option) any later version.
+
+  GlusterFS is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see
+  <http://www.gnu.org/licenses/>.
+*/
+
+
+#ifndef _IATT_H
+#define _IATT_H
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include <sys/types.h>
+#include <sys/stat.h> /* for iatt <--> stat conversions */
+#include <unistd.h>
+
+
+typedef enum {
+        IA_INVAL = 0,
+        IA_IFREG,
+        IA_IFDIR,
+        IA_IFLNK,
+        IA_IFBLK,
+        IA_IFCHR,
+        IA_IFIFO,
+        IA_IFSOCK
+} ia_type_t;
+
+
+typedef struct {
+        uint8_t    suid:1;
+        uint8_t    sgid:1;
+        uint8_t    sticky:1;
+        struct {
+                uint8_t    read:1;
+                uint8_t    write:1;
+                uint8_t    exec:1;
+        } owner, group, other;
+} ia_prot_t;
+
+
+struct iatt {
+        uint64_t     ia_ino;        /* inode number */
+        uint64_t     ia_gen;        /* generation number */
+        uint64_t     ia_dev;        /* backing device ID */
+        ia_type_t    ia_type;       /* type of file */
+        ia_prot_t    ia_prot;       /* protection */
+        uint32_t     ia_nlink;      /* Link count */
+        uint32_t     ia_uid;        /* user ID of owner */
+        uint32_t     ia_gid;        /* group ID of owner */
+        uint64_t     ia_rdev;       /* device ID (if special file) */
+        uint64_t     ia_size;       /* file size in bytes */
+        uint32_t     ia_blksize;    /* blocksize for filesystem I/O */
+        uint64_t     ia_blocks;     /* number of 512B blocks allocated */
+        uint32_t     ia_atime;      /* last access time */
+        uint32_t     ia_atime_nsec;
+        uint32_t     ia_mtime;      /* last modification time */
+        uint32_t     ia_mtime_nsec;
+        uint32_t     ia_ctime;      /* last status change time */
+        uint32_t     ia_ctime_nsec;
+};
+
+
+#define IA_ISREG(t) (t == IA_IFREG)
+#define IA_ISDIR(t) (t == IA_IFDIR)
+#define IA_ISLNK(t) (t == IA_IFLNK)
+#define IA_ISBLK(t) (t == IA_IFBLK)
+#define IA_ISCHR(t) (t == IA_IFCHR)
+#define IA_ISFIFO(t) (t == IA_IFIFO)
+#define IA_ISSOCK(t) (t == IA_IFSOCK)
+
+
+static inline uint32_t
+ia_major (uint64_t ia_dev)
+{
+        return (uint32_t) (ia_dev >> 32);
+}
+
+
+static inline uint32_t
+ia_minor (uint64_t ia_dev)
+{
+        return (uint32_t) (ia_dev & 0xffffffff);
+}
+
+
+static inline uint64_t
+ia_makedev (uint32_t ia_maj, uint32_t ia_min)
+{
+        return ((((uint64_t) ia_maj) << 32) & ia_min);
+}
+
+
+static inline ia_prot_t
+ia_prot_from_st_mode (mode_t mode)
+{
+        ia_prot_t ia_prot = {0, };
+
+        if (mode & S_ISUID)
+                ia_prot.suid = 1;
+        if (mode & S_ISGID)
+                ia_prot.sgid = 1;
+        if (mode & S_ISVTX)
+                ia_prot.sticky = 1;
+
+        if (mode & S_IRUSR)
+                ia_prot.owner.read = 1;
+        if (mode & S_IWUSR)
+                ia_prot.owner.write = 1;
+        if (mode & S_IXUSR)
+                ia_prot.owner.exec = 1;
+
+        if (mode & S_IRGRP)
+                ia_prot.group.read = 1;
+        if (mode & S_IWGRP)
+                ia_prot.group.write = 1;
+        if (mode & S_IXGRP)
+                ia_prot.group.exec = 1;
+
+        if (mode & S_IROTH)
+                ia_prot.other.read = 1;
+        if (mode & S_IWOTH)
+                ia_prot.other.write = 1;
+        if (mode & S_IXOTH)
+                ia_prot.other.exec = 1;
+
+        return ia_prot;
+}
+
+
+static inline ia_type_t
+ia_type_from_st_mode (mode_t mode)
+{
+        ia_type_t type = IA_INVAL;
+
+        if (S_ISREG (mode))
+                type = IA_IFREG;
+        if (S_ISDIR (mode))
+                type = IA_IFDIR;
+        if (S_ISLNK (mode))
+                type = IA_IFLNK;
+        if (S_ISBLK (mode))
+                type = IA_IFBLK;
+        if (S_ISCHR (mode))
+                type = IA_IFCHR;
+        if (S_ISFIFO (mode))
+                type = IA_IFIFO;
+        if (S_ISSOCK (mode))
+                type = IA_IFSOCK;
+
+        return type;
+}
+
+
+static inline mode_t
+st_mode_from_ia (ia_prot_t prot, ia_type_t type)
+{
+        mode_t    st_mode = 0;
+        uint32_t  type_bit = 0;
+        uint32_t  prot_bit = 0;
+
+        switch (type) {
+        case IA_IFREG:
+                type_bit = S_IFREG;
+                break;
+        case IA_IFDIR:
+                type_bit = S_IFDIR;
+                break;
+        case IA_IFLNK:
+                type_bit = S_IFLNK;
+                break;
+        case IA_IFBLK:
+                type_bit = S_IFBLK;
+                break;
+        case IA_IFCHR:
+                type_bit = S_IFCHR;
+                break;
+        case IA_IFIFO:
+                type_bit = S_IFIFO;
+                break;
+        case IA_IFSOCK:
+                type_bit = S_IFSOCK;
+                break;
+        case IA_INVAL:
+                break;
+        }
+
+        if (prot.suid)
+                prot_bit |= S_ISUID;
+        if (prot.sgid)
+                prot_bit |= S_ISGID;
+        if (prot.sticky)
+                prot_bit |= S_ISVTX;
+
+        if (prot.owner.read)
+                prot_bit |= S_IRUSR;
+        if (prot.owner.write)
+                prot_bit |= S_IWUSR;
+        if (prot.owner.exec)
+                prot_bit |= S_IXUSR;
+
+        if (prot.group.read)
+                prot_bit |= S_IRGRP;
+        if (prot.group.write)
+                prot_bit |= S_IWGRP;
+        if (prot.group.exec)
+                prot_bit |= S_IXGRP;
+
+        if (prot.other.read)
+                prot_bit |= S_IROTH;
+        if (prot.other.write)
+                prot_bit |= S_IWOTH;
+        if (prot.other.exec)
+                prot_bit |= S_IXOTH;
+
+        st_mode = (type_bit | prot_bit);
+
+        return st_mode;
+}
+
+
+static inline int
+iatt_from_stat (struct iatt *iatt, struct stat *stat)
+{
+        iatt->ia_dev        = stat->st_dev;
+        iatt->ia_ino        = stat->st_ino;
+
+        (void) iatt->ia_gen;
+
+        iatt->ia_type       = ia_type_from_st_mode (stat->st_mode);
+        iatt->ia_prot       = ia_prot_from_st_mode (stat->st_mode);
+
+        iatt->ia_nlink      = stat->st_nlink;
+        iatt->ia_uid        = stat->st_uid;
+        iatt->ia_gid        = stat->st_gid;
+
+        iatt->ia_rdev       = ia_makedev (major (stat->st_rdev),
+                                          minor (stat->st_rdev));
+
+        iatt->ia_size       = stat->st_size;
+        iatt->ia_blksize    = stat->st_blksize;
+        iatt->ia_blocks     = stat->st_blocks;
+
+        iatt->ia_atime      = stat->st_atime;
+        iatt->ia_atime_nsec = ST_ATIM_NSEC (stat);
+
+        iatt->ia_mtime      = stat->st_mtime;
+        iatt->ia_mtime_nsec = ST_MTIM_NSEC (stat);
+
+        iatt->ia_ctime      = stat->st_ctime;
+        iatt->ia_ctime_nsec = ST_CTIM_NSEC (stat);
+
+        return 0;
+}
+
+
+static inline int
+iatt_to_stat (struct iatt *iatt, struct stat *stat)
+{
+        stat->st_dev        = iatt->ia_dev;
+        stat->st_ino        = iatt->ia_ino;
+
+        (void) iatt->ia_gen;
+
+        stat->st_mode       = st_mode_from_ia (iatt->ia_prot, iatt->ia_type);
+
+        stat->st_nlink      = iatt->ia_nlink;
+        stat->st_uid        = iatt->ia_uid;
+        stat->st_gid        = iatt->ia_gid;
+
+        stat->st_rdev       = makedev (ia_major (iatt->ia_rdev),
+                                       ia_minor (iatt->ia_rdev));
+
+        stat->st_size       = iatt->ia_size;
+        stat->st_blksize    = iatt->ia_blksize;
+        stat->st_blocks     = iatt->ia_blocks;
+
+        stat->st_atime      = iatt->ia_atime;
+        ST_ATIM_NSEC_SET (stat, iatt->ia_atime_nsec);
+
+        stat->st_mtime      = iatt->ia_mtime;
+        ST_MTIM_NSEC_SET (stat, iatt->ia_mtime_nsec);
+
+        stat->st_ctime      = iatt->ia_ctime;
+        ST_CTIM_NSEC_SET (stat, iatt->ia_ctime_nsec);
+
+        return 0;
+}
+
+
+#endif /* _IATT_H */