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zfs boot: add code for listing child datasets of a given dataset
- only filesystem datasets are supported - children names are printed to stdout To do: allow to iterate over the list and fetch names programatically MFC after: 17 days
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commit
74b3e265c7
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=241283
@ -59,6 +59,7 @@ int zfs_parsedev(struct zfs_devdesc *dev, const char *devspec,
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const char **path);
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char *zfs_fmtdev(void *vdev);
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int zfs_probe_dev(const char *devname, uint64_t *pool_guid);
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int zfs_list(const char *name);
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extern struct devsw zfs_dev;
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extern struct fs_ops zfs_fsops;
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@ -658,3 +658,38 @@ zfs_fmtdev(void *vdev)
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rootname);
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return (buf);
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}
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int
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zfs_list(const char *name)
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{
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static char poolname[ZFS_MAXNAMELEN];
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uint64_t objid;
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spa_t *spa;
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const char *dsname;
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int len;
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int rv;
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len = strlen(name);
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dsname = strchr(name, '/');
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if (dsname != NULL) {
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len = dsname - name;
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dsname++;
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}
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memcpy(poolname, name, len);
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poolname[len] = '\0';
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spa = spa_find_by_name(poolname);
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if (!spa)
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return (ENXIO);
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rv = zfs_spa_init(spa);
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if (rv != 0)
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return (rv);
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if (dsname != NULL)
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rv = zfs_lookup_dataset(spa, dsname, &objid);
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else
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rv = zfs_get_root(spa, &objid);
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if (rv != 0)
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return (rv);
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rv = zfs_list_dataset(spa, objid);
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return (0);
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}
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@ -1387,8 +1387,6 @@ zap_lookup(const spa_t *spa, const dnode_phys_t *dnode, const char *name, uint64
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return (EIO);
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}
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#ifdef BOOT2
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/*
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* List a microzap directory. Assumes that the zap scratch buffer contains
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* the directory contents.
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@ -1513,8 +1511,6 @@ zap_list(const spa_t *spa, const dnode_phys_t *dnode)
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return fzap_list(spa, dnode);
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}
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#endif
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static int
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objset_get_dnode(const spa_t *spa, const objset_phys_t *os, uint64_t objnum, dnode_phys_t *dnode)
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{
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@ -1751,6 +1747,38 @@ zfs_lookup_dataset(const spa_t *spa, const char *name, uint64_t *objnum)
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return (0);
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}
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#ifndef BOOT2
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static int
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zfs_list_dataset(const spa_t *spa, uint64_t objnum/*, int pos, char *entry*/)
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{
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uint64_t dir_obj, child_dir_zapobj;
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dnode_phys_t child_dir_zap, dir, dataset;
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dsl_dataset_phys_t *ds;
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dsl_dir_phys_t *dd;
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if (objset_get_dnode(spa, &spa->spa_mos, objnum, &dataset)) {
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printf("ZFS: can't find dataset %ju\n", (uintmax_t)objnum);
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return (EIO);
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}
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ds = (dsl_dataset_phys_t *) &dataset.dn_bonus;
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dir_obj = ds->ds_dir_obj;
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if (objset_get_dnode(spa, &spa->spa_mos, dir_obj, &dir)) {
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printf("ZFS: can't find dirobj %ju\n", (uintmax_t)dir_obj);
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return (EIO);
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}
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dd = (dsl_dir_phys_t *)&dir.dn_bonus;
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child_dir_zapobj = dd->dd_child_dir_zapobj;
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if (objset_get_dnode(spa, &spa->spa_mos, child_dir_zapobj, &child_dir_zap) != 0) {
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printf("ZFS: can't find child zap %ju\n", (uintmax_t)dir_obj);
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return (EIO);
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}
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return (zap_list(spa, &child_dir_zap) != 0);
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}
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#endif
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/*
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* Find the object set given the object number of its dataset object
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* and return its details in *objset
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