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#include "clusterautoconfig.h"
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#include <string.h>
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#include <inttypes.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include "libgfs2.h"
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#define PAGE_SIZE (4096)
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#define DIV_RU(x, y) (((x) + (y) - 1) / (y))
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int compute_heightsize(unsigned bsize, uint64_t *heightsize,
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uint32_t *maxheight, uint32_t bsize1, int diptrs, int inptrs)
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{
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heightsize[0] = bsize - sizeof(struct gfs2_dinode);
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heightsize[1] = (uint64_t)bsize1 * diptrs;
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for (*maxheight = 2;; (*maxheight)++) {
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uint64_t space, d;
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uint32_t m;
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space = heightsize[*maxheight - 1] * inptrs;
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m = space % inptrs;
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d = space / inptrs;
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if (d != heightsize[*maxheight - 1] || m)
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break;
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heightsize[*maxheight] = space;
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}
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if (*maxheight > GFS2_MAX_META_HEIGHT) {
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errno = EINVAL;
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return -1;
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}
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return 0;
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}
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int compute_constants(struct gfs2_sbd *sdp)
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{
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uint32_t hash_blocks, ind_blocks, leaf_blocks;
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uint32_t tmp_blocks;
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sdp->md.next_inum = 1;
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sdp->sd_sb.sb_bsize_shift = ffs(sdp->bsize) - 1;
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sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
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GFS2_BASIC_BLOCK_SHIFT;
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sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
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sdp->sd_diptrs = (sdp->bsize - sizeof(struct gfs2_dinode)) /
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sizeof(uint64_t);
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sdp->sd_inptrs = (sdp->bsize - sizeof(struct gfs2_meta_header)) /
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sizeof(uint64_t);
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sdp->sd_jbsize = sdp->bsize - sizeof(struct gfs2_meta_header);
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sdp->sd_hash_bsize = sdp->bsize / 2;
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sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
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sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(uint64_t);
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sdp->sd_blocks_per_bitmap = (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header))
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* GFS2_NBBY;
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/* Compute maximum reservation required to add a entry to a directory */
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hash_blocks = DIV_RU(sizeof(uint64_t) * (1 << GFS2_DIR_MAX_DEPTH),
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sdp->sd_jbsize);
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ind_blocks = 0;
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for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
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tmp_blocks = DIV_RU(tmp_blocks, sdp->sd_inptrs);
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ind_blocks += tmp_blocks;
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}
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leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
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sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
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if (compute_heightsize(sdp->bsize, sdp->sd_heightsize, &sdp->sd_max_height,
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sdp->bsize, sdp->sd_diptrs, sdp->sd_inptrs)) {
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return -1;
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}
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if (compute_heightsize(sdp->bsize, sdp->sd_jheightsize, &sdp->sd_max_jheight,
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sdp->sd_jbsize, sdp->sd_diptrs, sdp->sd_inptrs)) {
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return -1;
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}
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return 0;
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}
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/* Returns 0 if fd1 and fd2 refer to the same device/file, 1 otherwise, or -1 on error */
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static int fdcmp(int fd1, int fd2)
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{
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struct stat st1, st2;
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if (fd1 < 0 || fd2 < 0)
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return -1;
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if ((fstat(fd1, &st1) != 0) || (fstat(fd2, &st2) != 0))
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return -1;
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if (S_ISBLK(st1.st_mode) && S_ISBLK(st2.st_mode)) {
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if (st1.st_rdev == st2.st_rdev) {
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return 0;
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}
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} else if ((st1.st_dev == st2.st_dev) && (st1.st_ino == st2.st_ino)) {
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return 0;
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}
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return 1;
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}
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int lgfs2_open_mnt(const char *path, int dirflags, int *dirfd, int devflags, int *devfd, struct mntent **mnt)
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{
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FILE *fp = setmntent("/proc/mounts", "r");
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if (fp == NULL) {
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perror("open: /proc/mounts");
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return 1;
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}
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/* Assume path is mount point until we know better. */
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*dirfd = open(path, dirflags);
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if (*dirfd < 0)
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return 1;
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while ((*mnt = getmntent(fp)) != NULL) {
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int fd;
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if (strcmp((*mnt)->mnt_type, "gfs2") != 0)
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continue;
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*devfd = open((*mnt)->mnt_fsname, devflags);
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/* Defer checking *devfd until later: whether it's ok to ignore
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* the error depends on whether we find the mount point. */
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if (strcmp(path, (*mnt)->mnt_dir) == 0)
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break;
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if (strcmp(path, (*mnt)->mnt_fsname) == 0 || fdcmp(*dirfd, *devfd) == 0) {
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/* We have a match but our above assumption was
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incorrect and *dirfd is actually the device. */
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close(*dirfd);
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*dirfd = open((*mnt)->mnt_dir, dirflags);
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break;
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}
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fd = open((*mnt)->mnt_dir, dirflags);
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if (fd >= 0) {
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int diff = fdcmp(*dirfd, fd);
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close(fd);
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if (diff == 0)
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break;
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}
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if (*devfd >= 0)
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close(*devfd);
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}
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endmntent(fp);
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if (*mnt == NULL) {
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close(*dirfd);
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return 0; /* Success. Answer is no. Both fds closed. */
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}
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if (*dirfd < 0) {
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close(*devfd);
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return 1;
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}
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if (*devfd < 0) {
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close(*dirfd);
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return 1;
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}
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return 0; /* Success. Answer is yes. Both fds open. */
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}
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int lgfs2_open_mnt_dev(const char *path, int flags, struct mntent **mnt)
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{
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int dirfd = -1;
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int devfd = -1;
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if (lgfs2_open_mnt(path, O_RDONLY, &dirfd, flags, &devfd, mnt) != 0)
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return -1;
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if (*mnt != NULL)
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close(dirfd);
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return devfd;
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}
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int lgfs2_open_mnt_dir(const char *path, int flags, struct mntent **mnt)
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{
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int dirfd = -1;
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int devfd = -1;
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if (lgfs2_open_mnt(path, flags, &dirfd, O_RDONLY, &devfd, mnt) != 0)
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return -1;
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if (*mnt != NULL)
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close(devfd);
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return dirfd;
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}
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