mirror of https://github.com/vitalif/e2fsprogs
580 lines
13 KiB
C
580 lines
13 KiB
C
/*
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* mkquota.c --- create quota files for a filesystem
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*
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* Aditya Kali <adityakali@google.com>
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*/
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#include "config.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <fcntl.h>
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#include "ext2fs/ext2_fs.h"
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#include "ext2fs/ext2fs.h"
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#include "e2p/e2p.h"
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#include "quotaio.h"
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#include "quotaio_v2.h"
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#include "quotaio_tree.h"
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#include "mkquota.h"
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#include "common.h"
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/* Needed for architectures where sizeof(int) != sizeof(void *) */
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#define UINT_TO_VOIDPTR(val) ((void *)(intptr_t)(val))
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#define VOIDPTR_TO_UINT(ptr) ((unsigned int)(intptr_t)(ptr))
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#if DEBUG_QUOTA
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static void print_inode(struct ext2_inode *inode)
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{
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if (!inode)
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return;
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fprintf(stderr, " i_mode = %d\n", inode->i_mode);
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fprintf(stderr, " i_uid = %d\n", inode->i_uid);
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fprintf(stderr, " i_size = %d\n", inode->i_size);
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fprintf(stderr, " i_atime = %d\n", inode->i_atime);
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fprintf(stderr, " i_ctime = %d\n", inode->i_ctime);
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fprintf(stderr, " i_mtime = %d\n", inode->i_mtime);
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fprintf(stderr, " i_dtime = %d\n", inode->i_dtime);
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fprintf(stderr, " i_gid = %d\n", inode->i_gid);
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fprintf(stderr, " i_links_count = %d\n", inode->i_links_count);
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fprintf(stderr, " i_blocks = %d\n", inode->i_blocks);
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fprintf(stderr, " i_flags = %d\n", inode->i_flags);
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return;
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}
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#endif
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/*
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* Returns 0 if not able to find the quota file, otherwise returns its
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* inode number.
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*/
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int quota_file_exists(ext2_filsys fs, int qtype, int fmt)
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{
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char qf_name[256];
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errcode_t ret;
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ext2_ino_t ino;
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if (qtype >= MAXQUOTAS)
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return -EINVAL;
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quota_get_qf_name(qtype, QFMT_VFS_V1, qf_name);
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ret = ext2fs_lookup(fs, EXT2_ROOT_INO, qf_name, strlen(qf_name), 0,
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&ino);
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if (ret)
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return 0;
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return ino;
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}
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/*
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* Set the value for reserved quota inode number field in superblock.
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*/
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void quota_set_sb_inum(ext2_filsys fs, ext2_ino_t ino, int qtype)
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{
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ext2_ino_t *inump;
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inump = (qtype == USRQUOTA) ? &fs->super->s_usr_quota_inum :
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&fs->super->s_grp_quota_inum;
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log_debug("setting quota ino in superblock: ino=%u, type=%d", ino,
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qtype);
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*inump = ino;
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ext2fs_mark_super_dirty(fs);
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}
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errcode_t quota_remove_inode(ext2_filsys fs, int qtype)
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{
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ext2_ino_t qf_ino;
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errcode_t retval;
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retval = ext2fs_read_bitmaps(fs);
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if (retval) {
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log_err("Couldn't read bitmaps: %s", error_message(retval));
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return retval;
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}
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qf_ino = (qtype == USRQUOTA) ? fs->super->s_usr_quota_inum :
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fs->super->s_grp_quota_inum;
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quota_set_sb_inum(fs, 0, qtype);
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/* Truncate the inode only if its a reserved one. */
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if (qf_ino < EXT2_FIRST_INODE(fs->super))
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quota_inode_truncate(fs, qf_ino);
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ext2fs_mark_super_dirty(fs);
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fs->flags &= ~EXT2_FLAG_SUPER_ONLY;
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retval = ext2fs_write_bitmaps(fs);
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if (retval) {
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log_err("Couldn't write bitmaps: %s", error_message(retval));
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return retval;
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}
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return 0;
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}
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static void write_dquots(dict_t *dict, struct quota_handle *qh)
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{
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dnode_t *n;
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struct dquot *dq;
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for (n = dict_first(dict); n; n = dict_next(dict, n)) {
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dq = dnode_get(n);
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if (dq) {
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dq->dq_h = qh;
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update_grace_times(dq);
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qh->qh_ops->commit_dquot(dq);
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}
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}
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}
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errcode_t quota_write_inode(quota_ctx_t qctx, int qtype)
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{
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int retval = 0, i;
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dict_t *dict;
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ext2_filsys fs;
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struct quota_handle *h = NULL;
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int fmt = QFMT_VFS_V1;
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if (!qctx)
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return 0;
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fs = qctx->fs;
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retval = ext2fs_get_mem(sizeof(struct quota_handle), &h);
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if (retval) {
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log_err("Unable to allocate quota handle: %s",
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error_message(retval));
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goto out;
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}
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retval = ext2fs_read_bitmaps(fs);
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if (retval) {
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log_err("Couldn't read bitmaps: %s", error_message(retval));
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goto out;
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}
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for (i = 0; i < MAXQUOTAS; i++) {
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if ((qtype != -1) && (i != qtype))
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continue;
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dict = qctx->quota_dict[i];
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if (!dict)
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continue;
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retval = quota_file_create(h, fs, i, fmt);
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if (retval < 0) {
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log_err("Cannot initialize io on quotafile");
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continue;
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}
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write_dquots(dict, h);
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retval = quota_file_close(h);
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if (retval < 0) {
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log_err("Cannot finish IO on new quotafile: %s",
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strerror(errno));
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if (h->qh_qf.e2_file)
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ext2fs_file_close(h->qh_qf.e2_file);
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quota_inode_truncate(fs, h->qh_qf.ino);
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continue;
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}
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/* Set quota inode numbers in superblock. */
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quota_set_sb_inum(fs, h->qh_qf.ino, i);
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ext2fs_mark_super_dirty(fs);
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ext2fs_mark_bb_dirty(fs);
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fs->flags &= ~EXT2_FLAG_SUPER_ONLY;
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}
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retval = ext2fs_write_bitmaps(fs);
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if (retval) {
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log_err("Couldn't write bitmaps: %s", error_message(retval));
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goto out;
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}
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out:
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if (h)
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ext2fs_free_mem(&h);
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return retval;
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}
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/******************************************************************/
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/* Helper functions for computing quota in memory. */
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/******************************************************************/
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static int dict_uint_cmp(const void *a, const void *b)
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{
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unsigned int c, d;
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c = VOIDPTR_TO_UINT(a);
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d = VOIDPTR_TO_UINT(b);
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return c - d;
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}
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static inline qid_t get_qid(struct ext2_inode *inode, int qtype)
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{
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if (qtype == USRQUOTA)
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return inode_uid(*inode);
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return inode_gid(*inode);
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}
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static void quota_dnode_free(dnode_t *node,
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void *context EXT2FS_ATTR((unused)))
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{
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void *ptr = node ? dnode_get(node) : 0;
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ext2fs_free_mem(&ptr);
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free(node);
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}
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/*
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* Set up the quota tracking data structures.
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*/
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errcode_t quota_init_context(quota_ctx_t *qctx, ext2_filsys fs, int qtype)
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{
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int i, err = 0;
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dict_t *dict;
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quota_ctx_t ctx;
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err = ext2fs_get_mem(sizeof(struct quota_ctx), &ctx);
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if (err) {
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log_err("Failed to allocate quota context");
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return err;
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}
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memset(ctx, 0, sizeof(struct quota_ctx));
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for (i = 0; i < MAXQUOTAS; i++) {
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if ((qtype != -1) && (i != qtype))
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continue;
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err = ext2fs_get_mem(sizeof(dict_t), &dict);
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if (err) {
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log_err("Failed to allocate dictionary");
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quota_release_context(&ctx);
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return err;
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}
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ctx->quota_dict[i] = dict;
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dict_init(dict, DICTCOUNT_T_MAX, dict_uint_cmp);
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dict_set_allocator(dict, NULL, quota_dnode_free, NULL);
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}
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ctx->fs = fs;
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*qctx = ctx;
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return 0;
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}
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void quota_release_context(quota_ctx_t *qctx)
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{
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dict_t *dict;
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int i;
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quota_ctx_t ctx;
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if (!qctx)
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return;
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ctx = *qctx;
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for (i = 0; i < MAXQUOTAS; i++) {
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dict = ctx->quota_dict[i];
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ctx->quota_dict[i] = 0;
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if (dict) {
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dict_free_nodes(dict);
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free(dict);
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}
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}
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*qctx = NULL;
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free(ctx);
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}
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static struct dquot *get_dq(dict_t *dict, __u32 key)
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{
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struct dquot *dq;
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dnode_t *n;
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n = dict_lookup(dict, UINT_TO_VOIDPTR(key));
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if (n)
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dq = dnode_get(n);
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else {
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if (ext2fs_get_mem(sizeof(struct dquot), &dq)) {
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log_err("Unable to allocate dquot");
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return NULL;
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}
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memset(dq, 0, sizeof(struct dquot));
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dict_alloc_insert(dict, UINT_TO_VOIDPTR(key), dq);
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dq->dq_id = key;
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}
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return dq;
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}
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/*
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* Called to update the blocks used by a particular inode
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*/
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void quota_data_add(quota_ctx_t qctx, struct ext2_inode *inode, ext2_ino_t ino,
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qsize_t space)
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{
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struct dquot *dq;
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dict_t *dict;
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int i;
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if (!qctx)
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return;
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log_debug("ADD_DATA: Inode: %u, UID/GID: %u/%u, space: %ld", ino,
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inode_uid(*inode),
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inode_gid(*inode), space);
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for (i = 0; i < MAXQUOTAS; i++) {
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dict = qctx->quota_dict[i];
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if (dict) {
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dq = get_dq(dict, get_qid(inode, i));
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if (dq)
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dq->dq_dqb.dqb_curspace += space;
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}
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}
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}
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/*
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* Called to remove some blocks used by a particular inode
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*/
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void quota_data_sub(quota_ctx_t qctx, struct ext2_inode *inode, ext2_ino_t ino,
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qsize_t space)
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{
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struct dquot *dq;
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dict_t *dict;
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int i;
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if (!qctx)
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return;
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log_debug("SUB_DATA: Inode: %u, UID/GID: %u/%u, space: %ld", ino,
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inode_uid(*inode),
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inode_gid(*inode), space);
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for (i = 0; i < MAXQUOTAS; i++) {
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dict = qctx->quota_dict[i];
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if (dict) {
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dq = get_dq(dict, get_qid(inode, i));
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dq->dq_dqb.dqb_curspace -= space;
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}
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}
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}
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/*
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* Called to count the files used by an inode's user/group
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*/
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void quota_data_inodes(quota_ctx_t qctx, struct ext2_inode *inode,
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ext2_ino_t ino, int adjust)
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{
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struct dquot *dq;
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dict_t *dict;
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int i;
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if (!qctx)
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return;
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log_debug("ADJ_INODE: Inode: %u, UID/GID: %u/%u, adjust: %d", ino,
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inode_uid(*inode),
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inode_gid(*inode), adjust);
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for (i = 0; i < MAXQUOTAS; i++) {
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dict = qctx->quota_dict[i];
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if (dict) {
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dq = get_dq(dict, get_qid(inode, i));
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dq->dq_dqb.dqb_curinodes += adjust;
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}
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}
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}
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errcode_t quota_compute_usage(quota_ctx_t qctx)
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{
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ext2_filsys fs;
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ext2_ino_t ino;
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errcode_t ret;
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struct ext2_inode inode;
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qsize_t space;
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ext2_inode_scan scan;
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if (!qctx)
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return 0;
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fs = qctx->fs;
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ret = ext2fs_open_inode_scan(fs, 0, &scan);
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if (ret) {
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log_err("while opening inode scan. ret=%ld", ret);
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return ret;
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}
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while (1) {
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ret = ext2fs_get_next_inode(scan, &ino, &inode);
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if (ret) {
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log_err("while getting next inode. ret=%ld", ret);
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ext2fs_close_inode_scan(scan);
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return ret;
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}
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if (ino == 0)
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break;
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if (inode.i_links_count &&
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(ino == EXT2_ROOT_INO ||
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ino >= EXT2_FIRST_INODE(fs->super))) {
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space = ext2fs_inode_i_blocks(fs, &inode) << 9;
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quota_data_add(qctx, &inode, ino, space);
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quota_data_inodes(qctx, &inode, ino, +1);
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}
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}
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ext2fs_close_inode_scan(scan);
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return 0;
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}
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struct scan_dquots_data {
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dict_t *quota_dict;
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int update_limits; /* update limits from disk */
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int update_usage;
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int usage_is_inconsistent;
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};
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static int scan_dquots_callback(struct dquot *dquot, void *cb_data)
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{
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struct scan_dquots_data *scan_data = cb_data;
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dict_t *quota_dict = scan_data->quota_dict;
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struct dquot *dq;
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dq = get_dq(quota_dict, dquot->dq_id);
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dq->dq_id = dquot->dq_id;
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dq->dq_dqb.u.v2_mdqb.dqb_off = dquot->dq_dqb.u.v2_mdqb.dqb_off;
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/* Check if there is inconsistancy. */
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if (dq->dq_dqb.dqb_curspace != dquot->dq_dqb.dqb_curspace ||
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dq->dq_dqb.dqb_curinodes != dquot->dq_dqb.dqb_curinodes) {
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scan_data->usage_is_inconsistent = 1;
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fprintf(stderr, "[QUOTA WARNING] Usage inconsistent for ID %d:"
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"actual (%llu, %llu) != expected (%llu, %llu)\n",
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dq->dq_id, (long long)dq->dq_dqb.dqb_curspace,
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(long long)dq->dq_dqb.dqb_curinodes,
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(long long)dquot->dq_dqb.dqb_curspace,
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(long long)dquot->dq_dqb.dqb_curinodes);
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}
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if (scan_data->update_limits) {
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dq->dq_dqb.dqb_ihardlimit = dquot->dq_dqb.dqb_ihardlimit;
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dq->dq_dqb.dqb_isoftlimit = dquot->dq_dqb.dqb_isoftlimit;
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dq->dq_dqb.dqb_bhardlimit = dquot->dq_dqb.dqb_bhardlimit;
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dq->dq_dqb.dqb_bsoftlimit = dquot->dq_dqb.dqb_bsoftlimit;
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}
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if (scan_data->update_usage) {
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dq->dq_dqb.dqb_curspace = dquot->dq_dqb.dqb_curspace;
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dq->dq_dqb.dqb_curinodes = dquot->dq_dqb.dqb_curinodes;
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}
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return 0;
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}
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/*
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* Read all dquots from quota file into memory
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*/
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static errcode_t quota_read_all_dquots(struct quota_handle *qh,
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quota_ctx_t qctx, int update_limits)
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{
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struct scan_dquots_data scan_data;
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scan_data.quota_dict = qctx->quota_dict[qh->qh_type];
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scan_data.update_limits = update_limits;
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scan_data.update_usage = 0;
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return qh->qh_ops->scan_dquots(qh, scan_dquots_callback, &scan_data);
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}
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/*
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* Write all memory dquots into quota file
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*/
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#if 0 /* currently unused, but may be useful in the future? */
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static errcode_t quota_write_all_dquots(struct quota_handle *qh,
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quota_ctx_t qctx)
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{
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errcode_t err;
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err = ext2fs_read_bitmaps(qctx->fs);
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if (err)
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return err;
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write_dquots(qctx->quota_dict[qh->qh_type], qh);
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ext2fs_mark_bb_dirty(qctx->fs);
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qctx->fs->flags &= ~EXT2_FLAG_SUPER_ONLY;
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ext2fs_write_bitmaps(qctx->fs);
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return 0;
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}
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#endif
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/*
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* Updates the in-memory quota limits from the given quota inode.
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*/
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errcode_t quota_update_limits(quota_ctx_t qctx, ext2_ino_t qf_ino, int type)
|
|
{
|
|
struct quota_handle *qh;
|
|
errcode_t err;
|
|
|
|
if (!qctx)
|
|
return 0;
|
|
|
|
err = ext2fs_get_mem(sizeof(struct quota_handle), &qh);
|
|
if (err) {
|
|
log_err("Unable to allocate quota handle");
|
|
return err;
|
|
}
|
|
|
|
err = quota_file_open(qh, qctx->fs, qf_ino, type, -1, 0);
|
|
if (err) {
|
|
log_err("Open quota file failed");
|
|
goto out;
|
|
}
|
|
|
|
quota_read_all_dquots(qh, qctx, 1);
|
|
|
|
err = quota_file_close(qh);
|
|
if (err) {
|
|
log_err("Cannot finish IO on new quotafile: %s",
|
|
strerror(errno));
|
|
if (qh->qh_qf.e2_file)
|
|
ext2fs_file_close(qh->qh_qf.e2_file);
|
|
}
|
|
out:
|
|
ext2fs_free_mem(&qh);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Compares the measured quota in qctx->quota_dict with that in the quota inode
|
|
* on disk and updates the limits in qctx->quota_dict. 'usage_inconsistent' is
|
|
* set to 1 if the supplied and on-disk quota usage values are not identical.
|
|
*/
|
|
errcode_t quota_compare_and_update(quota_ctx_t qctx, int qtype,
|
|
int *usage_inconsistent)
|
|
{
|
|
ext2_filsys fs = qctx->fs;
|
|
struct quota_handle qh;
|
|
struct scan_dquots_data scan_data;
|
|
ext2_ino_t qf_ino;
|
|
errcode_t err = 0;
|
|
|
|
if (!qctx->quota_dict[qtype])
|
|
goto out;
|
|
|
|
qf_ino = qtype == USRQUOTA ? fs->super->s_usr_quota_inum :
|
|
fs->super->s_grp_quota_inum;
|
|
err = quota_file_open(&qh, fs, qf_ino, qtype, -1, 0);
|
|
if (err) {
|
|
log_err("Open quota file failed");
|
|
goto out;
|
|
}
|
|
|
|
scan_data.quota_dict = qctx->quota_dict[qtype];
|
|
scan_data.update_limits = 1;
|
|
scan_data.update_usage = 0;
|
|
scan_data.usage_is_inconsistent = 0;
|
|
err = qh.qh_ops->scan_dquots(&qh, scan_dquots_callback, &scan_data);
|
|
if (err) {
|
|
log_err("Error scanning dquots");
|
|
goto out;
|
|
}
|
|
*usage_inconsistent = scan_data.usage_is_inconsistent;
|
|
|
|
out:
|
|
return err;
|
|
}
|