static void do_ii_write_lock(struct inode *inode, unsigned int lsc) { switch (lsc) { case AuLsc_DI_CHILD: ii_write_lock_child(inode); break; case AuLsc_DI_CHILD2: ii_write_lock_child2(inode); break; case AuLsc_DI_CHILD3: ii_write_lock_child3(inode); break; case AuLsc_DI_PARENT: ii_write_lock_parent(inode); break; case AuLsc_DI_PARENT2: ii_write_lock_parent2(inode); break; case AuLsc_DI_PARENT3: ii_write_lock_parent3(inode); break; default: BUG(); } }
static int aufs_commit_metadata(struct inode *inode) { int err; aufs_bindex_t bindex; struct super_block *sb; struct inode *h_inode; int (*f)(struct inode *inode); sb = inode->i_sb; si_read_lock(sb, AuLock_FLUSH); ii_write_lock_child(inode); bindex = au_ibstart(inode); AuDebugOn(bindex < 0); h_inode = au_h_iptr(inode, bindex); f = h_inode->i_sb->s_export_op->commit_metadata; if (f) err = f(h_inode); else { struct writeback_control wbc = { .sync_mode = WB_SYNC_ALL, .nr_to_write = 0 /* metadata only */ }; err = sync_inode(h_inode, &wbc); } au_cpup_attr_timesizes(inode); ii_write_unlock(inode); si_read_unlock(sb); return err; } /* ---------------------------------------------------------------------- */ static struct export_operations aufs_export_op = { .fh_to_dentry = aufs_fh_to_dentry, /* .fh_to_parent = aufs_fh_to_parent, */ .encode_fh = aufs_encode_fh, .commit_metadata = aufs_commit_metadata }; void au_export_init(struct super_block *sb) { struct au_sbinfo *sbinfo; __u32 u; sb->s_export_op = &aufs_export_op; sbinfo = au_sbi(sb); sbinfo->si_xigen = NULL; get_random_bytes(&u, sizeof(u)); BUILD_BUG_ON(sizeof(u) != sizeof(int)); atomic_set(&sbinfo->si_xigen_next, u); }
static int test_inode_busy(struct super_block *sb, aufs_bindex_t bindex, unsigned int sigen, const unsigned int verbose) { int err; unsigned long long max, ull; struct inode *i, **array; aufs_bindex_t bstart, bend; array = au_iarray_alloc(sb, &max); err = PTR_ERR(array); if (IS_ERR(array)) goto out; err = 0; AuDbg("b%d\n", bindex); for (ull = 0; !err && ull < max; ull++) { i = array[ull]; if (i->i_ino == AUFS_ROOT_INO) continue; /* AuDbgInode(i); */ if (au_iigen(i) == sigen) ii_read_lock_child(i); else { ii_write_lock_child(i); err = au_refresh_hinode_self(i); au_iigen_dec(i); if (!err) ii_downgrade_lock(i); else { ii_write_unlock(i); break; } } bstart = au_ibstart(i); bend = au_ibend(i); if (bstart <= bindex && bindex <= bend && au_h_iptr(i, bindex) && au_test_ibusy(i, bstart, bend)) { err = -EBUSY; AuVerbose(verbose, "busy i%lu\n", i->i_ino); AuDbgInode(i); } ii_read_unlock(i); } au_iarray_free(array, max); out: return err; }